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Concrete dowel bars

concrete dowel bars From airport runway expansions, lane additions, full-depth repair patching to gas leak pinpointing we have the solution to meet your needs. Dowels are a standard feature of certain kinds of pavement and will work well. The MIT-DOWEL-SCAN is a totally new device allowing the operator to measure and evaluate pavement joints in real-time without using a rail system. ¼ the weight of steel, TUF-BAR dowels do not corrode or deteriorate making it possible for you to lock the concrete joints together in a sustainable manner. The process is simple: cut a slot across the deteriorated joint, place an epoxy-coated steel dowel bar, fill the slot with a nonshrink concrete grout, and diamond-grind the pavement surface to restore smoothness. Two types of dowels were used: epoxy-coated and uncoated. It is used in concrete pavements, slabs, columns, and staircases. dowel in proper horizontal alignment for the best possible load transfer between concrete pavement sections. Length of Dowel bar and their sizes: dowel bar epoxy coated concrete faulted concrete faulted dowel bar †" dia. E Specification for Road and Bridge Works, Clause 2605*, which requires pull-out tests on specific sample sizes to a maximum of 0. 25 in. 13, Requirements for all Dowel Bars Dowel Bars Aug 2, 2018 Producer Address Construction Anchors @ 13900 E. Figure 2. The result of mises stress for concrete on top of dowel bar is shown in Fig. 300 (Building 6) • Overland Park, KS 66202 PO Box 412676 • Kansas City, MO 64141 (816) 471-2570 (816) 471-2570 (800) 444-2570 (800) 444-2570 Dowel bars are commonly used in the construction of airports and concrete roads which require high endurance. Available as on-grade or slab rider units, the drills are ideal for a variety of tasks including lane additions on highways, airports or bridges, full depth concrete road Fast #221 is developed specifically for installation in concrete and masonry base materials. Dowel Bars & Accessories EAL supplies and services the concrete distributor and contractor network with quality paving construction load transfer products that Dowel bar used in Cement Road Construction is a short, round and smooth steel bar which is used to provide a mechanical connection between two road slabs, without restricting horizontal joint movement due to moving loads of vehicles. These dowels bars, typically made of high-strength steel, are generally comprised of elongated, cylindrical, high-shear rods. c)bursting stresses in the concrete. The Speed Dowel® sleeve creates a cavity that will accept either smooth or deformed dowels and will Before Concrete Pour Dowel bars, the reinforcing steel that protrudes through formwork, have been the traditional method for joining bars in segmental construction. Dowel bars shall be mild steel rounds with details/dimensions as indicated in the drawings and free from oil, dirt, loose rust or scale. and less significantly reduces shear capacity For nearly one hundred years, dowel bars have been used in concrete pavements as a means to bridge vehicle loads across adjacent slabs. (25-40 mm) diameter typical for roads Corporate Office: 6803 W. 1: dowel bars placing by PQC paver The purpose of the dowel bar is to effectively transfer the load between two concrete slabs and to keep the two slabs in same height. In addition, they prevent ‘steps’ together with different vertical slab movements during the life span of the poured concrete. e. Many of those retrofits have been in place for 20 plus years and performing well. They also keep slabs in horizontal and vertical alignment. Wire suspension basket for poured in place Dowel Baskets. dowels The corrosion of steel dowel bars ultimately leads to joint failure. What is a dowel? A dowel is a cylindrical steel rod. D. Item # DBA30, Non-Sag, High Modulus, Standard Set Epoxy Gel. 6 Dowel Bar Retrofit is to be followed when constructing this item of work. Dowel Bar - Full Epoxy Coated ERP #Dowel_Bar_Full_Epoxy The MIT-DOWEL-SCAN is a measuring system for the non-destructive (NDT) and accurate measurement of tie / dowel bar positions and tie bar / dowel bar alignmen Dowel bar retrofit has been in use in the US for about three decades now. The steel bars of this assembly are large and, once incorporated into the concrete pavement, transfer the vehicular load from one slab to another, eliminating differential settlement at the joint. dowels at concrete flatwork construction joints and expansion joints. Dowel Bars are smooth round bars which mainly serve as load transfer device across concrete joints. It is commonly known that dowels can increase pavement performance considerably, particularly in circumstances where heavy traffic or poor soils are present. Standard metallurgy as found in rebar complying with ASTM A615 or A706 is typical and adequate. The panels will be doweled between each other and into a 10 ft (3 m) wide band at the perimeter of the building. At the free joints shown on the Plans, use epoxy-coated, plain, round, steel dowel bars that meet the requirements of Subsection 853. 25mm. S. They are placed across transverse joints of concrete pavement to allow movement to take place. SPEED DOWEL #5 X 12 IN PSD12/5 200/CTN. In order to prevent corrosion, dowel bars are either coated with stainless steel (Figure 2) or epoxy (Figure 3). Traditional Method 1 2 3 Drill dowel holes in lumber (edge form) Insert dowel into edge form An Alternative to Traditional Round Dowel Bars Plate Dowel Innovations Driven by Industrial Concrete Paving Introduction Round dowel bars have long been the standard load transfer device for concrete pavements with thick-nesses of about 8 inches or greater. Dowel bars shall be plain steel bars conforming to ASTM A 615, ASTM A 616 or ASTM A 617 and shall be free from burring or other deformation restricting slippage in the concrete. ) Epoxy coated also available for CalTrans jobs. American Concrete Pavement Association, Skokie, IL. g. D-Bond is manufactured to D. topic. Accommodate some differential movement longitudinally along the joint. They are placed across transverse joints of concrete pavement to allow movement to take place. 4. For Suspending, Connecting and Anchoring to Concrete D108A Headed Dowel Bar Insert The Dayton Superior D108A Dowel Bar Insert is a one-piece unit integrally forged from material meeting ASTM A-615 Grade 60 requirements. In general, they have performed well in street, road, highway and In general reinforcement practice, dowel bars are used as a way of transferring force from one concrete slab to another. rebar, into concrete and masonry. High quality plastic materials ensure durability, reliability, and longevity. or is it a combination of these effects/ Thanks in advance. Dowel Bars can be supplied in various diameters with sawn end to specific lengths. SS 304, SS 304L, SS 316, SS316L dowel bars are short steel bars that provide mechanical connection between the slabs without and effect on horizontal joint movement. Alleviating a couple of extra steps and allowing the paving contractor to concentrate on paving operation. 1 offer some ad-vantages concerning placement of reinforcement structures. This eliminates the need to embed the bar deep enough into the base material to develop the rebar for steel failure. Dowel Bar. Skokie, IL. Rebar dowels are used to brace the joints between two concrete elements. The IDBI was placing 1. Slot Cutting and Removal Verify that all slots are cut parallel to each other and to the centerline of the roadway within the maximum tolerance permitted by the contract documents, typically ¼ in. About us Dowel bars are placed at the transverse joints of concrete pavement and they take part in partial wheel load transfer from one slab to its adjacent slab. Diamond shapes for formed Woman-owned Organization Specializing In The Manufacturing Of Load Transfer Devices For Highways, Airports, Commercial and Industrial Concrete Paving Projects. They shall be straight, free of irregularities and burring restricting slippage in the concrete. Dowels allow horizontal movement of slabs during contraction after laying the concrete and at temperature changes. (200 mm) or greater. ASTM A615 Grade 60 Steel The O-Dowel bar is a carbon steel tubular dowel bar that's improving highway construction, from new jointed pavement concrete construction to full-depth repairs. Dowel lubrication significantly affects pullout force Dowel rotation as extreme as 2 in. Dowel bars are a critical structural component in jointed concrete pavements. In order to permanently eliminate the negative impact of steel corrosion, we produce dowels that can be used to form some of the strongest jointed connections. A range of dowel bar debonding caps manufactured from rigid PVC tube with compressible filler fixed into one end, which allows for expansion of dowel bars in construction joints. 4401) the recommended grade for marine and corrosive environments. Normal concrete expansion and contraction takes place as the smooth steel dowel bar slides inside the sleeve. Dowels reduce deflec­ tions and stresses due to traffic loads. Grade 316 (1. The typical approach is to saw cut and jackhammer out the slots for the dowels. Closed circle shapes are distinct from open formats. Manufactured for tilt-up, highway, and airport runway slabs. Adjacent concrete sections are kept in place using steel-restraining dowel bars. These joints are mainly provided at 50m Considering dowel bar encased in concrete pavement could be regarded as the modification of semi-infinite beam, the solution for deformation, bending moment and shearing force of dowel bar was About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators The dowel bar inserter is a device mounted on a slipform paver. Contractors and construction product suppliers have discovered that dowel bar substitutes improve their schedules and bottom line by eliminating costly form cleaning and repair. A project on U. They are tough, durable and have an average wall thickness of 1. 195 in Spokane, Wash. 64th St. Optimizing Dowel Bar Design using the DowelCAD Software – Robert Rasmussen, The Transtec Group, Inc. DBR is a CPR technique that restores load transfer capability of existing jointed concrete pavement by the placement of dowel bars across joints and cracks that exhibit poor load transfer. Standard Construction Drawing BP-2. of dowel bar length. Speed Dowel is a highly effective and efficient means for managing load transfer across construction joints. Easy as 1-2-3 Dowel Bar Installation Method with Sika® Speed Dowel® Attach Speed Dowel base to form and tap sleeve onto the base Place first concrete pour Strip form and insert ungreased dowel into the Speed Dowel sleeve Dowel Bar Installation Using vs. encased in a sleeve). 5. Assume a 12" dowel spacing. Use as an installation system for concrete slab dowels. , Ste. DOWEL BARS View Product Dowel bars are placed at the transverse joints of concrete pavement and they take part in partial wheel load transfer from one slab to its adjacent slab. You can also choose from structural steel bar dowel bars for concrete, as well as from is alloy, non-alloy dowel bars for concrete, and whether dowel bars for concrete is cold heading steel, or free cutting steel. Panels will be placed separately and each will have a perimeter grade beam turn-down. pavement, rounding the corner of the Where fresh concrete pavement is placed See Revised Standard Plan RSP P1 for TABLE 1 DOWEL, SEE TABLE 1 DRILL AND BOND DOWEL, SEE TABLE 1 DRILL AND BOND DOWEL BAR DOWEL BAR LUBRICANT DOWEL BAR LUBRICANT NEW Conc EXISTING Conc OR NEW Conc LUBRICANT DOWEL BAR Dowel bars are smooth round bars which mainly serve as load transfer device across concrete joints. . These dowels bars, typically made of high-strength steel, are generally comprised of elongated, cylindrical, high-shear rods. All sizes and lengths supplied to individual requirements. Speed Dowel® places rigid polypropylene sleeves in perfect position perpendicular to the vertical joint edge and parallel to both the horizontal plane and to each other. Chairs should allow at least a ½ inch clearance between the bottom of the dowel and the bottom of the slot. In general, round steel dowels have performed very well in street, road, highway, and airport pavement applications. Stainless Steel bars also available. Epoxy can be used for anchoring bolts, dowels and reinforcing bars, i. The rule of thumb for dowel size is: Dowel Diameter = 1/8 of the Pavement Thickness. They are smooth steel bars installed across a transverse joint Dowel bars are coated with an approved material to break the bond with the concrete and should be free of dirt, loose rust, or scale at the time of placement. The dowel bar is used in reinforcement to connect the old and new concrete structures. On one side of the joint, the dowel bar is encased in concrete. We at Classic Metallic, manufacture concrete slab dowel bars in epoxy coated, galvanized and stainless steel. SMOOTH DOWEL 1/2 X 24 INCH. The dowel bars also allow axial thermal expansion and contraction of the concrete slab along the axis of the dowel. 73 mm from the surface of the slab. To transfer the load of producing in the concrete slab or pavement, dowel bars are left to joint any slab, column, and pavement. Thus dowels help to transfer loads allowing expansion and contraction of adjacent slabs independently. View Product. sales@clmet. In their most basic form, they’re used to create a strong, reinforced joint between two concrete slabs either horizontally or vertically. joints. • Fiberglas™ Dowel Bars are used as “load transfer” devices between joints in concrete slabs providing a mechanical connection between slabs while allowing for horizontal contraction and expansion of the slab itself. 5 in. Zinc alloy-sleeved dowel, as manufactured and after five weeks in sodium chloride bath We offer Epoxy Coated Dowel Bars in India with highly corrosion-resistant quality with Fusion Bonded Epoxy powder applied as per ASTM A775/775M-07b for concrete structure, which is resistant to Acid, Alkali, especially the Chloride (mainly for Salt). In general dowel bars are used in the concrete pavements and are round steel bars. Reinforced concrete specimens producing dowel action of beam-longitudinal bars against concrete cover at beam-column interfaces were tested. ) and a maximum of the top of the dowel bars or 1/2 of the slab thickness. For nearly one hundred years, dowel bars have been used in concrete pavements as a means to bridge vehicle loads across adjacent slabs. Dowel bars are typically 32 to 38 mm (1. dowels, Figure 14. Austenitic stainless steel dowel bars are generally produced from plain round material. Dowels are supplied in a basket, and can be supplied epoxy coated, painted, or plain. These bars are mostly used in the jointed plain concrete pavement for carrying the added load and stress which are induced because of the moving vehicle. 25 in. For standard dowel bar arrangement, dowel bars spaced at 304. Expansion joint in Concrete pavement: As the name indicates that the joint for expanding concrete pavement due to rise in slab temperature. 5 inches) in diameter, 460 mm (18 inches) long and spaced 305 mm (12 inches) apart. Side two is pinned to side one and cast into the new concrete. ARA (2005). Joint Tie bars are typically deformed rebar placed at longitudinal road construction joints. The design load is a 9,000-lb dual wheel load centered 6" from the slab edge. It features a wide service temperature range of -40° to 176° F (-40° to 80° C). topic. GOMACO's IDBI Dowel Bar Inserter is the industry's most productive and compact system for the automatic insertion of dowel bars across a finished concrete slab. Tie bars are meant to assist in keeping two adjacent slabs tied together and to resist horizontal movement. 1 Joints in concrete pavements of highways, airfields, and other facilities are exposed to stresses and strains due to traffic and temperature variation. Kankakee, IL (AHT) @ 2150 B S. Route 45/52 Kankakee IL 60901 Steel Dowel Bars (12mm) are available from us in numerous lengths; please see the drop down menu for full details. Dowel bars are round steel bars (not torr steel). Dowel Bar Specifications. 12/19 Plastic sleeves are used with predrilled expansion boards, like cedar or polypropylene, to accurately position and align e. The sleeves create a cavity that will accept either smooth or deformed dowels and will prevent bonding to the initial concrete placement. 2. Dowel bars are smooth round bars with the main function of load transferring between pavements. Evaluating and Optimizing Dowel Bar Alignment. Dormark Construction can help take some of the stress off by installing dowel bar baskets and sealing joints. A blend of petroleum, bitumen, plasticiser and solvents for use on dowel bars, giving complete bond breakage after casting. The anchor/ferrule is cast into the face of the concrete wall. The dowel bars may be designed on the basis of Bradbury’s analysis for load transfer capacity of a single dowel bar in shear, bending and bearing in concrete. 6 x 7. Dowel Bar also allows axial thermal expansion and contraction of the concrete slab along the shear axis. It is a technique which several U. SPEED DOWEL #4 X 9 PSD09/4 200/CTN. For the half of a dowel bar or tie bar placed in hardened concrete, comply with the Standard Plans and the following. Figure 9-70 shows a picture of a dowel bar assembly. In fact, it’s a bit of a science. SPEED DOWEL BASE #4 PSD/4BX 200/CTN. A flexible PVC sleeve, closed at one end that pushes over the end of dowel bars quickly and easily to give an efficient way of debonding mild steel dowel bars. The patch is then ready for concrete placement. DOWEL BAR SUBSTITUTE Hooked Splicer Hooked Dowel-In Hooked dowels may be substituted with a hook DB-SAE or hooked Dowel-In. are avoided. Our dowel bar caps and chairs are precision injection molded for a perfect fit on 1-1/4” or 1-1/2” dowel bars. Andy Machon A dowel bar retrofit is a method of reinforcing cracks in highway pavement by inserting steel dowel bars in slots cut across the cracks. They provide a durable, corrosion resisting solution to connections in concrete or other structural applications. You would see the reinforcement bars are extended in a column over the slab level to connect the next slab. states' departments of transportation have successfully used in repairs to address faulting in older jointed plain concrete pavements. If you like this article, please do share this with your friends and tell us your queries in the below comment box. Concrete dowels are produced by various shaped web plate perforation of standard steel profiles fitted with crossing reinforcement bars before concrete casting. Following dowel placement the slots are then typically backfilled with a non-shrink concrete mixture, and the p Effect of concrete cover on dowel-concrete shear capacity for 1. Dalco maintains an inventory of more than 2000 tons of rebar to service your needs; we will cut and bend to your specifications. These dowels are designed to be cast into concrete to improve strength. dowel does not affect shear capacity Reduction in concrete cover from 3. “These dowels are capable of providing structural performance in concrete pavements that is comparable to (or better than) that of conventional epoxy-coated solid steel dowels when properly designed. As a result of field observation and field performance, M&R has concluded leaving dowel basket assembly tie wires uncut. Tie bars Tie bars are deformed rebars… Dowel bars are a more traditional approach to load transfer – however, our “Permasleeve” square dowel bars offer significant benefits over round dowels, with better resistance to bending and shear. The process involves placing load transfer devices across transverse joints and/or cracks to prevent heavy faulting, pumping, and/or corner breaks. Figure 9-70. Most typically dowel bars are manufactured from billet steel, grade 40 bars in accordance with ASTM A 615 and AASHTO M31, “Standard specification for Deformed and Plain Billett Steel Bars for Concrete Reinforcement”. Steel plate dowels carry loads across a construction joint, maintain vertical alignment between adjacent slabs and allow concrete shrinkage both perpendicular and parallel to the joint . , had Acme Concrete Paving, Spokane, installing 8,500 dowels and filling the slots with CTS The MIT-DOWEL-SCAN technology is required by many state DOT´s when dowel bar insertion is used. Dowel Bar Adhesives - #DBA30. ASLAN™ 100 Tie Bars - Companion to Dowel Bars • Contraction Joints • Expansion Joints • Isolation Joints • Construction Joints • Shear Dowels in MSE Walls • Jointed Rigid Pavement • Dowel Bar Retro Fits Dowel bars are smooth round bars which mainly serve as load transfer device across concrete joints. This brief summary presents the field observation and field performance findings. Dowel bars are a critical structural component in jointed concrete pavements. Dowel bars are also required in all new concrete pavements to ensure a 50-year service life. After split cracking, behavior depended on the bar size, contribution of concrete cover, and stirrup location and strength. The dowel bars also allow axial thermal expansion and contraction of the concrete slab along the axis of the dowel . Stainless UK are CARES approved for processing stainless steel bars for reinforcement and hold large stocks of stainless steel dowel bar. Products - Dowel Baskets . This extra part of steel that appear after casting of column is knows as dowel bars. Dowel bars are placed at the transverse joints of concrete pavement and they take part in partial wheel load transfer from one slab to its adjacent slab. e. 16 Dowel bars are expected to resist differential vertical movement between the slabs while allowing expansion and contraction in the horizontal direction due to thermal contraction and expansion of the concrete. Dowel bar debonding sleeves are manufactured from high grade, flexible PVC and are designed to form a positive debonded dowelled joint in reinforced concrete construction. • Pavement joints, dowels, and tie bars • Benefits of dowel and tie bars • Dowel and tie bar design • Construction • Summary Presentation Outline 2nd International Conference on Best November 2, 2011 Practices for Concrete Pavements Pavement dowel bars are smooth-surfaced mechanical devices that are commonly inserted or installed at transverse joint locations in concrete pavements to provide reliable transfer of vehicle loads across joints between slabs. to 1. S. Allow the epoxy to harden before placing the concrete to prevent the dowels from moving during the concrete placement. Clear all {{ item. Paving Materials Engineering Expert Center dowel bars over transverse joints or cracks so a minimum of 7 inches of dowel bar extends into adjacent panel. Dowel bars move between joints in strategic points and ensure stretching of the concrete blocks, distribute the load on concrete blocks to entire ground equally and prevent the concentration of the pressure on a single point. FOR EXPANSION OR CONTRACTION JOINTS IN CONCRETE SLABS 6” TO 9” THICK, MINIMUM SLAB THICKNESS 5”. Introduction 1. Product description: Expansion caps are 75mm long plastic caps designed to cap round dowels in concrete joints. It is commonly known that dowels can increase pavement performance considerably, particularly in circumstances where heavy traffic or poor soils are present. • Repairing surface defects such as blowholes and pin holes in concrete substrates. carbon and alloy steel grade Concrete slab dowel steel bar price from manufacturer in china for construction US $650. It is designed for installation onto a two- or four-track paver. single gang concrete drills E-Z Drill’s single gang dowel pin drills are an effective solution for projects ranging in size from several hundred to a few thousand holes. The dowel bars are usually of 32 to 38 mm diameter, 460mm long, and spaced at a distance of 305mm apart from each other. Due to its hollow construction, it is lighter, safer and more durable than conventional solid steel dowel bars. 3/4″ Smooth Dowels. Greater concrete bearing area, less stress. A joint and crack beneath it were formed at the middle of the slab to simulate field conditions. Dowel bars always inserted in the mid-depth of the slab. The O-Dowel tubular dowel bar means faster installations, fewer safety risks and better freight efficiencies. This rapid set anchoring adhesive can be used for new construction or repair work. Dowel bars are being used to retrofit many of these older pavements which extend their life by more than 15 years. The sliding ends shall be sawn or cropped cleanly with no protrusions outside the normal diameter of the bar. of dowel bar epoxy coated core board ‡" foam sides of slot before placing dowels foam core board at bottom and caulk in crack or joint and along 3 the dowel stop dowel bar past do not force and the longitudinal joint, respectively. The dowel bars also allow axial thermal expansion and contraction of the concrete slab along the axis of the dowel. Concrete Pavement Progress, Vol. Concrete slab dowel bars are used to transfer the load from one slab to another whilst permitting axial thermal expansion along the axis of the dowel. They are placed across to the transverse joints of the concrete pavement to allow movement to take place. Both Expansion and Contraction Joint Cradles are supplied in 1 metre lengths. K-4 TYPE “S” CONTRACTION AND K-5 TYPE “S” EXPANSION. Examining concrete pavement dowel bars (see Specifications A615/A615M and A1078/A1078M) in joints is important to ensure that load transfer at joints between concrete slabs occurs efficiently in order to prevent damage to the pavement and High Performance Dowel Bars. It transfers the load to its adjacent slab and reduces the impact of loading on a single slab. Form Direct is a leading, experienced partner for concrete construction projects of any size and complexity. Lomont IMT manufactures durable, easy to install dowel bar caps and dowel bar chairs for highway concrete restoration projects (see below). You may aware that a steel rod has the maximum length is 12m but we cannot pour concrete up to 12m in a single moment. 25 pcs / bundle. m and the total movement of the dowel bar relative to the concrete shall be not less than 0. 5 inch; Glass Fiber Reinforced Polymer (GFRP) Coated Steel Bar: 100% SOLIDS, HIGH MODULUS EPOXY DOWEL BAR ADHESIVE. Dowel bars are used to provide an increase in load transfer efficiency by allowing the leave slab to absorb some of the load before the load is distributed across it. The dowels are set in the footing prior to casting the footing concrete and are subsequently spliced to the longitudinal bars in the column or wall. Best practice drill holes ¼” larger than dowel bar When steel is encountered move drilled hole the least amount as possible Consider skipping one bar if cant find good location to drill Check drill bits for wear Check drill rig for drill depth and alignment SIMPLEX pioneers innovation, striving to forge a new class of affordable, high-performance products, including our Armour Coat ™ dowel bars and baskets, dowel basket alignment stripes, completely encapsulated fusion-bonded dowels (when required) without any wet or cold patching, and stabilized dowel basket frames for thick sections of concrete pavements. Project Inspection Responsibilities . Dowel bar is bar which are left one meter or one and half meter from the casting beam,slab,columns for future expansion of beam,slab and columns. The form and base are stripped leaving the embedded sleeve properly aligned and ready to received dowel rods or bars. 25mm at the stress. Dowel bars where all the longitudinal bars in the column are in compression. You can also achieve lateral (sideways) movement of +/-10 mm for round and square bars which will help to reduce internal stresses on the concrete. Various diameters, lengths, and spacing can be used depending on the load requirements that need to be met. TYPICAL APPLICATION • Fine filling resin for use in MasterProtect 1800 series Novolac epoxy systems. Add To Quote View Details. As increasing emphasis is placed on the need for long-life pavements, it becomes extremely important to use construction materials that are capable of performing satisfactorily for service lives of 50 years or more. After drilling, secure dowel bars and tie bars into the existing pavement with PVC dowel sleeve: It serves to facilitate the movement of dowel bar. The other half is not treated and will remain fixed in place within the concrete. They are placed across transverse joints of concrete pavement to allow movement to take place. In construction of concrete slabs, expansion and contraction joints are purposely positioned in the slab where cracks in, or movement of, the slab will occur. Concrete Accessories | Dowel Baskets. Can be effectively used in thinner slabs than round dowels. , P. 375 inches larger than the tie bar diameter. All of our smooth dowels are premium saw cut (no burs. The use of Dowel Bar Sleeves overcomes the problems associated with paint, compounds, tapes and greases which if not applied correctly can be ineffective. 4301) suitable for most atmospheric and concrete covered environments. See Figures A and B 5-694. They are inserted at the mid-depth of slab and coated a bond breaking material to restrict bonding to the PCC. Each cap contains an internal mould fluting which compresses with the movement of the dowel thus keeping the cap in place. DBA-30 is supplied in easy-to-mix 1:1 by volume ratio and is color-coded to assure that mixing is complete. Dowelform® allows the engineer to specify dowels in both directions where transverse and longitudinal joints meet as all joints are now free to move independently of each other. The bars are generally made up of mild-steel-round-bars of short length. Selecting the correct product concrete is generally milled (though chipping is allowed) a minimum of 50 mm (2 in. Filters Done. They increase load transfer efficiency by allowing the leave slab to assume some of the load before the load is actually over it. The range of dowel bar length will be 45d to 50d as d is the dia of the bar. DBA 700 is an epoxy anchoring adhesive that is the strongest of all dowel bar and anchoring adhesives. POLY-GRIP is used for adhering dowel bars and tie bars for partial or full-depth concrete pavement repairs and new pavement construction applications. For nearly one hundred years, dowel bars have been used in concrete pavements as a means to bridge vehicle loads across adjacent slabs. 41, No. From practical point of view, the use of plastic sleeve (e. When the dowel bars are used for expansion joints, the free end of each bar has an expansion tube attached to the bar. Airblow the holes to remove dust and debris after drilling. High strength dowel bars shall conform to ASTM A 714, Class 2, Type S, Grade I, II or III, Bare Finish. 60 mm in the 203. Dowel Bars are short steel round bars used while casting concrete that provide a connection between concrete slabs without restricting horizontal joint movement. DBA-30 is a two component, 100% solids, nonabrasive, high modulus epoxy gel. Bars are manufactured from American made ASTM A 615 Grade 60 [420] rein-forcing steel to develop more than 125% of the specified yield strength of grade 60 reinforcing bar. Midwest Dowel Bar Basket & Concrete Joint Sealing Concrete paving operations can be large, complex and stressful. Uses of Dowel Bar: Dowel bars are used in rigid pavement where steel and concrete is used; It is mainly used in the column, slab, staircase design where the possible volume may enlarge or expand in the future. DBA-30 exhibits superior adhesion to both concrete and steel. dowel bars in PCCP, the following guidelines are hereby prescribed: 1. As an example, Morefield explained that during concrete roadway construction, multiple concrete dowel bars may be embedded between adjacent Dowel bar can be used in RCC slab and columns. The Relationship Between Sawed Joints and Dowel Bars. SPEED DOWEL #4 X 12 PSD12/4TX 200/CTN. Mark Snyder, Ph. 0 inches (150 mm) minimum embedment length on each side of the joint 1. Dowel bar retrofit (DBR) is a load transfer restoration process that delivers a renewed level of structural strength to portland cement concrete pavement (PCCP). 25 to 1. Dowels are used in precast concrete walls for forming connections between wall panels, usually in conjunction with grout tubes or cast-in-place elements. Dowel bars. Dowel Bar. Concrete Forming. Dowel bar placement and alignment at a transverse joint. Dowel bar is a terminology used in concrete pavements in general. 3(4)C Dowel Bars and Tie Bars For the half of a dowel bar or tie bar placed in fresh concrete, comply with the requirements of Section 5-05. CHEMICAL RESISTANCE Dowel bars are used to transfer the load from one concrete slab to whilst permitting axial thermal expansion along the axis of the dowel. Plate Dowels – Widely Used in Floor Slabs Now being used in some parking areas / industrial pavements. The dowel bars also allow axial thermal expansion and contraction of the concrete slab along the axis of the dowel. This two-component product cures fast and is useful for all grades of rebar, dowel bars, threaded rods, bolts, and special fastening systems. • Have a surface treatment to effect bond with the concrete. Both bituman-based paint (debonding agent) and plastic sleeve could serve the purpose of reducing friction between dowel bar and surrounding concrete. • Dowel bar retrofit (DBR) • Diamond grinding of pavement surfaces The webinar will also: • Identify early age concrete behavior that necessitates jointing • Identify the types of concrete pavement joints • Apply accepted principles to establish reasonable slab geometries A full-scale jointed plain concrete pavement (JPCP) with two different dowel bar arrangements, namely, standard and special method, was constructed and evaluated under actual traffic-environmental condition in Florida. Inside the building, slab panels will be 25 x 25 ft (7. In this context, they’re also known as tie bar, lap bar, starter bar, or projecting bar. 25 inch 1. 6 m) in plan. 1: dowel bars placing by PQC paver Dowel Bars: Check this and other similar items at Sitetech Building Products! Or Call SITETECH DUBLIN 01 4016554 or CORK 021 4355255 Select a drill that minimizes damage to the concrete surface, such as a hydraulic powered drill; Select a drill diameter no more than 0. 16. causes severe reduction in ultimate shear capacity Reduction in dowel embedment length to 3 in. 1: dowel bars placing by PQC paver A dowel bar assembly (Figure 7-2), commonly called a "basket", is placed on the subgrade before paving at the location of the contraction joint. ” Dr. The device is applied in: Concrete road construction (highways) Dowel Bar Mechanical Splices. Dowel Bar Alignments of Typical In-Service Keywords: dowel bar arrangement, concrete pavements, finite element analysis and long-term performance. ACPA (2006). Before Concrete Forming and Accessories. Dowels allow horizontal movement of slabs during contraction in the time period after laying the concrete pavement and at temperature changes. FABRICATED FOR 3/4”, 1” OR 1-1/4” DIAMETER DOWELS AS REQUIRED To order, specify: type, Dowel diameter centers, paving thickness and basket length. In DBR, slots are cut, concrete removed, dowel bars inserted, repair mortar is placed in the slots, the surface finished, cured, and, most often, diamond ground. Generally, dowel bars are mounted in a welded wire assembly referred to as a basket (Figure 6-2). The concrete between the saw cuts is then removed with lightweight jackhammers (heavy-weight jackhammers tend to damage the concrete around the cuts). 1: dowel bars placing by PQC paver Dalco stocks and supplies reinforcing steel Grade 40 and 60 in standard diameters from #3 bar (10 mm) through #18 bar (57 mm) for use in construction of highways, buildings, bridges and industrial facilities. , Ltd. (See the table for dimensions). Generally, the bar is 18 inches long, and its diameter is within 1. BEAM—A horizontal structural member supporting loads from a floor or roof system to columns, girders or walls. 5 inch by 18 inch (38 by 457 mm) dowels 12 inches (305 mm) apart, and placed approximately 335,000 dowel bars throughout the entire project. 1000 pcs / pallet. MIT-DOWEL-SCAN Dowel Bar Scanner We proudly introduce MIT-DOWEL-SCAN the latest development in Non-Destructive determination of dowel and tie bar positions in plain concrete. Dowel bar mechanical splices are used to avoid reinforcing bars from penetrating or protruding from forms. BASKET—Wire assembly to support and space dowel bars along the expansion joints in concrete pavement. Dowel Baskets. 8 mm (12 in) only within the wheel paths were installed for In reinforced concrete slabs, dowel bars are inserted in between layers of reinforcement mesh at (approximately) 300mm centres. Reinforcing dowel bars are short steel bars that help provide a connection between multiple concrete slabs without restricting horizontal movement between joints. These systems exhibit high bond, tensile and compressive strengths and are moisture insensitive after curing. At each joint location, the DBI automatically inserts the dowels into the fresh concrete along the length of the joint. per 12 in. 3. Slots are cut using diamond-tipped saw blades; the concrete is removed using lightweight jackhammers. Dowels should be smooth and in the range of 1-1/4 to 1-1/2" diameter. They provide a corrosion resistant and highly durable solution for connections in concrete slabs and other applications. The chairs placed on the dowel bars should be strong enough to allow full support of the dowel bar. Normal concrete expansion and contraction takes place as the smooth steel dowel slides inside the plastic sleeve. One of the most efficient ways to restore load transfer at the joints is dowel bar retrofit (DBR). The dowel bars are placed and supported at a height midway between the subgrade level and the prospective concrete roadway upper surface level, eg, 4 /2" above the subgrade when the concrete BAR SUPPORTS—Devices of formed wire, plastic or precast concrete, to support, hold, and space reinforcing bars. Beli Concrete Vibrator Online terdekat di Jakarta Barat berkualitas dengan harga murah terbaru 2021 di Tokopedia! Pembayaran mudah, pengiriman cepat & bisa cicil 0%. This empty space is filled with some easy to contract material so, that it may adjust its volume according the need of the dowel bar. Plastic dowel bar caps are available in standard 100mm lengths. As an example, Morefield explained that during concrete roadway construction, multiple concrete dowel bars may be embedded between adjacent It is suggested that dowel bar with large diameter can effectively reduce the dowel-concrete bearing stress. Where movement is purposely designed for longitudinal joints, dowel bars can be adopted. Dowel Bar Retrofit (DBR) Publication Date: January 17, 2013 SCOPE Dowel bar retrofit (DBR) consists of installing epoxy-coated, smooth, round dowel bars into existing concrete pavement across transverse joints and/or cracks. in. They are provided at transverse joints to affect load transfer from one slab to the next, while permitting relative longitudinal movement of the concrete slabs. Dowel Bar Cradles Manufactured from 6mm diameter drawn wire, cradles are used to support dowel bars in expansion and contraction joints. Dalco also supplies reinforcing bar in A706 weldable and epoxy coated. SMOOTH DOWEL 5/8 X 24 INCH. 1. 8 mm (12 in), while three dowel bars spaced at 304. topic. The use of Dowel Bar Sleeves overcomes the problems associated with paint, compounds, tapes and greases which if not applied correctly can be ineffective. The foam inserts in the dowel sleeve allow horizontal movement in two directions as the concrete contracts, but no vertical movement. a) equal to the shear strength of the steel dowel bar cross section at the joint. 350 Highway Kansas City MO 64138 Construction Materials, Des Moines @ 5210 Ne 17th Street Des Moines IA 50313 Dayton Superior Corp. This insert works extremely well in areas of heavy Dowel Bar Splicer . Plain round mild steel, high yield and stainless steel dowel bars are available, supplied with either cropped or sawn ends. Clean the area by sand blasting and air blasting. Dowel bars Dowel bars are placed at the transverse joints of concrete pavement and they take part in partial wheel load transfer from one slab to its adjacent slab. 25 in. 1 Background Dowel bars are commonly used in jointed plain concrete pavements (JPCP) as a load transfer device across joints, especially for pavements with heavy traffic. Product Manufacturer 1. The primary Concrete is then placed and consolidated around the Speed Dowel using normal practices. March 30, 2005. More Concrete Accessories: Select Accessories Company. • Dowel bars anchoring. All transverse joints shall be provided with dowel bars in accordance with Department Order. 1:45 PM Field Trials of Alternate Dowel Bars – James Cable, Cable Concrete Consultation, LLC 2:00 PM Effects of Dowel Alignment in Concrete Pavements – Kyle Hoegh, University of Minnesota 2:15 PM For new to existing concrete slabs Type C provides flat bar steel edge protection, for use when casting a new slab against an existing slab. Updated October 8, 2020. Tie Bars and Starter Bars are cut to length from deformed “N” bar and available in black, galvanized or stainless steel. DBB supplies and services the concrete distributor and contractor network with quality paving construction load transfer products that provide performance and value to the industry. 971 6 575 1335. 00/ Ton 50 Tons (Min. PVC dowel sleeve) around dowel bars can well prepared off-site and manufactured well in advance, thus saving the time of construction. These bars are mainly used in jointed plain concrete pavement (JPCP) to bear the additional stress and […] Since the bar is being installed at deeper embedments and being used to develop lengths for seismic design, shear dowels and starter bars as well as tension for compression lap splices, reinforcing bar theory must be applied and adhesive anchor systems must be qualified for recognition and use under the 2015 IBC before being used for Dowel Bar Sleeves are a flexible PVC sleeve to prevent concrete bonding on the dowel bar Dowel Bar Caps are a rigid PVC tube with a compressible plug one end, designed as a tight fit over dowel bars in expansion joints (If combining both sleeves and caps, use the next size up for the cap). Dowels, Caps and Baskets. Round steel dowel bars have long been the standard load transfer device for concrete pavements with thicknesses of about 8 in. 3 lbs 24″ / 3 lbs. We supply specialist equipment and materials for the concrete building industry, along with a wide selection of on-site essentials. In conclusion, Dowel Bars are mechanically inserted by a “Dowel Bar Inserter (DBI)” with vibration into the concrete. Many newer concrete paving machines can place dowel and tie bars into the wet concrete in between screeding operations. Order) Shandong Le Ren Special Steel Co. 40, series of 2014, re: Prescribing Minimum Design Standard for Portland Cement Concrete Pavement (PCCP) in Arterial and Secondary National Roads and Access Roads Leading to Ports as You do want dowels to keep from faulting across joints. Press Release BoMetals Acquires Dowel Bars and Baskets Our high-quality concrete drills and dowel drilling machines deliver maximum accuracy so you and your crews can do the job once, do it right and move on. This technique provides for retrofitting dowel bars in a concrete pavement that was originally constructed as a non-dowel jointed pavement. While their intended use is easy to recognize, operation of this equipment isn’t quite so simple. M&R has concluded the likelihood of a joint Dowel bars allow the pavement to slide freely at the joint during expansion and contraction of the pavement. The epoxy-coated dowel bars are placed in the slots, then the slots are filled with grout and the joints or cracks are filled with waterproof caulk. It is commonly known that dowels can increase pavement performance considerably, particularly in circumstances where heavy traffic or poor soils are present. per 18 in. E. Dowel Bars Dowel bars are round, smooth, steel bars placed across transverse joints to transfer loads without restricting horizontal joint movements due to thermal and moisture contractions and expansions. Dayton Superior Dowel-Bar Sub Anchor, #4x24" Dayton Superior D-101-A through D-104-A DB-SAE Splicers are one-piece forged units made from grade 60 rebar and are supplied with NC or UNC threads depending on size. This results in lower deflections at the joints and reduced slab stresses. The Dowel Bar Material Dowel Bar Material Comparison (#9) AASHTO M227 GR 70-80 ASTM A615 Grade 40 ASTM A615 Grade 60 AASHTO M31 Not Specified Recommended x x x California Iowa x x Illinois x Indiana x x Louisiana x Michigan x Minnesota x x Missouri x North Carolina x North Dakota x Ohio x Texas x Wisconsin x x The purpose of dowel bars is to transfer loads across a joint without restricting joint movement due to thermal contraction and expansion of the concrete. Starter Bars and Threaded Anchors/Ferrules offer a simple connection method for construction joints, typically in wall to slab applications. Hooked DB-SAEs and DIs will meet or exceed those requirements as defined in ACI 318. Anchor: #XEICAHKRgrtop. The two grades of dowel bar held in stock are: Grade 304 (1. Dowel Bars are placed in the transverse joints of the concrete floor and they play a part in the transfer of partial shear load from a floor to adjacent floor. To develop load transfer across a joint, dowel bars are arranged at specified intervals and at mid-depth of the pavement thickness. Where movement is purposely designed for longitudinal joints, dowel bars can be adopted. O. 08. Center the length of dowel bars May also use …" Dia dowel bars 2’-4" – ‡" existing concrete pavement is not required. Quick View. Also Read: Construction Methodology of Box Culvert Dowel Bars are short, smooth, and round steel bar which is used for offering a mechanical connection between slabs without restricting horizontal joint movement. 5. Uses Pneumatic concrete dowel drills have one purpose – to drill holes. On the other side, however, the PVC dowel sleeve is bonded directly to concrete so that movement of dowel bar can take place. Dowel bars are embedded on both the slabs, and on one slab there is a dowel cap which provides space for the bar to occupy it when there is expansion in both slabs. Side one is bolted to anchors drilled into the existing concrete. Lengths from 15-18 inches (380-460 mm) 6. 25 to 1. Dowel Bar Basket Detail For roadway and runway construction we offer paving forms, loose dowels, loose tie bars, dowel & tie bar baskets, basket stakes, fiberglass dowel and tie bar basket systems, welded wire fabric, fabricated rebar, WWF / rebar support chairs, epoxies, cures, curing blankets, topical sealers, backer rod, hot & cold-applied joint sealants Places rigid polypropylene sleeves in perfect position perpendicular to the vertical joint edge and parallel to both the horizontal plane and to each other. Dowel Bar Sleeves are manufactured from high grade flexible PVC. Dowels are placed in transversal contraction or construction joints of concrete pavements and help to transfer loading between individual slabs. Dowel bars reduce joint faulting by allowing the contraction and expansion of slabs. 922. 20 mm concrete slab, with the top of the bar being at approximately 85. Tie bars for the longitudinal joints were inserted into the slab at 24 inch (600 mm) spacing. BarSplice Products BARSPLICER is supplied as a two-piece mechanical dowel bar replacement “DBR” for concrete structures. How-To: Anchoring Bolts, Dowels and Rebar With Epoxy. Call for volume pricing. American Concrete Pavement Association. Dowel bars restrain vertical movement between adjacent slabs, while permitting the slab to move horizontally. Steel dowels are a critical component in slab joints which are subject to high loads such as warehouse floors. Dowel bar retrofit consists of placing dowel bars at transverse joints and cracks in existing concrete pavement. Adjacent concrete sections are kept in place using steel-restraining dowel bars. Our Dowel bars were to be embedded at a depth of 101. Where movement is purposely designed for longitudinal joints, Epoxy coated Dowel Bars can be adopted. Where movement is purposely designed for longitudinal joints, Coated Dowel Bars can be adopted. The bars are placed between two concrete slabs so that loads are transferred between the two slabs and allowing for any horizontal movement also (due to expansion). All bars are bent using the appropriate pin diameter. Dowel bar sleeves are manufactured from high grade, flexible virgin plastic and are designed to form a positive deboned dowelled joint in reinforced concrete construction. SMOOTH DOWEL 1/2 X 18 INCH. Description (258. The detailed requirements for dowels, such as dowel bar size, length, and spacing, are shown in the CPCD Standards. Three dowel bars, used for load transfer, were installed below the joint at the mid-thickness of each slab. If there is suspect of damage to the dowel bars by exposure to ultraviolet light, a sample may be obtained and tested for coating thickness. Dowel embedment depths, misalignments & translations are determined precisely. Specific locations and numbers vary by state, however a typical arrangement might look like Figure 1. Place foam core board at center of dowel bar flush with surface of concrete pavement, or slightly recessed. dowel is placed into each sleeve for the adjoining concrete slab. Length / Weight: 16″ / 2 lbs 18″ / 2. 4MN/sq. 50 in. When used with a sleeve arrangement such as Dowelmaster or Speedsleeve, the dowel ensures the slab can Concrete slab dowel bars are used to transfer the load from one slab to another whilst permitting axial thermal expansion along the axis of the dowel. It has also been used in new construction when dowel bar installing equipment on a concrete paving machine inadvertently fails to install dowels at contraction joints. Austenitic stainless steel dowel bars are generally produced from plain round material. But there are certain best practices and processes to keep in mind for proper drill operation, whether it’s an on-grade, slab-rider or Dowel bar is used to Reduces deflection and stresses. and 1. As increasing emphasis is placed on the need for long-life pavements, it becomes extremely important to use construction materials that are capable of performing satisfactorily for long service lives duration. Its impact resistance, and mechanical strength is greater than that of concrete. Photo 23. with three bars in each face, which reduces to a four-bar column higher up in building elevation; obviously the four bars would be in the corners of the column cage. Various diameters, lengths, and spacing can be used depending on the load requirements that need to be met. 14 N/m2 (20 lb/sq. Dowel Bar - 3/5 Painted Red Oxide ERP #Dowel_Bar_3_5_Painted_Red_Oxide. 01) The work involves the following: 1. Figure 9-4. Choose a gangmounted drill if higher productivity is needed for larger jobs. b) Bearing capacity of the concrete where the dowel bar is in contact with the concrete. 0-1. Dowel Bars Jan 28, 2020 Nu Way Concrete Forms, Jackson @ 4788 Old Cape Road East Jackson MO 63755 01-MAR-21 Rebarco LLC. Open concrete dowels as sketched in Fig. Dowel Bar is a smooth round bar which is mainly serving as a load transfer device across the concrete joints. They are placed over joins in concrete slabs in order to prevent cracking. The dowel bars are either coated or made up of stainless steel to protect it from corrosion. In other words in case of column. Since the pressure is equally distributed over the ground surface, different deformations such as slump, cracks and disintegration etc. Individual slab replacement with rapid strength concrete consists of removing the existing concrete pavement and replacing it with rapid strength concrete. Cut a piece foam core board material (angled if joints are skewed) to fit tightly around dowel bar. (Figure 2) Most typically dowel bars are manufactured from billet steel, grade 60 bars in accordance with ASTM A 615 and AASHTO M31, “Standard specification for Deformed and Plain Billett Steel Bars for Concrete Reinforcement”. 5 inches. What deserves special mention is that a distinct difference exists between the variation tendency of mises stress versus distance from joint face for 28-mm A wide variety of dowel bars for concrete options are available to you, such as aisi, jis, and astm. FJ3 Dowel bar with sliding free end; c) As (b) but where adjoining slab is to be cast several weeks after the first slab or where the slab has significantly different overall free joint dimensions use: FJ5 Dowel bar with sliding free end in sleeve providing lateral horizontal movement dowel bar basket assembly is allowing the dowel bars to shift as concrete is placed. The average bond stress on debonded bars cast into concrete specimen and subjected to pull out tests at 7 days shall not exceed 1. That’s not to say they’re difficult to operate. Abstract: We are designing concrete slabs-on-ground for a new steel foundry. Standard Basket width 12", Standard distribution bars 3/8”diameter, Standard leg wire 3/16”. Special lengths and diameters available upon request. They are also known as “tension-compression” mechanical spices, since they can also resist both tension tensile and compression forces. Dowel-Bar Retrofit for PCCP Checklist 7. The multi-fitting cap end design allows for standard diameters of round dowels to all be accommodated in just two sizes of caps – 10mm – 16mm, and 16mm – 50mm. com. topic. SMOOTH DOWEL 3/4 X 18 INCH. label }} Find the required dowel bar size for contraction joints in a 10" concrete slab resting on a subgrade material with a 200 psi/in modulus of subgrade reaction. We left lapping length of column steel for next floor columns. Measurement and evaluation of dowel bar positions in a joint takes less than a minute. The variability of concrete cover can be the result of using dowel baskets of incorrect heights or the placement of pavement that is thicker (or thinner) than specified. Smooth Concrete Dowels Dowel bars are short steel bars that provide a mechanical connection between slabs without restricting horizontal joint movement. Dowel bars must stand up to repeated loadings from traffic and resist corrosion to be effective for this extended service life. Steel dowel bars are used to transfer dynamic loads across joints in concrete slabs. 5-01. The paving operation, bar insertion and finishing operations are all combined into one compact unit. Where a large area is being covered with concrete, the slab is normally divided into a number of bays and adjacent bays are tied to each other by means of dowels, short lengths of steel bar embedded half in one bay and half in its neighbour. SMOOTH DOWEL 5/8 X 18 INCH. Moisture insensitivity and a quick set make DBA 700 the perfect anchoring epoxy when anchoring with moisture present as well as anchoring heavy production equipment to concrete slabs. Dowel Bars are installed between concrete slabs to allow for the load to transfer between them as well as allowing for movement (horizontal) because of expansion. They come in 12mm,16mm,20mm,25mm and 32mm diameters. When the rebar is not being used to hold the concrete members together, post-installed anchor theory can be applied. End caps should allow at least ¼ inch of movement at each end of the bar. SR999P. ) bond stress, measure seven days after casting. Dowel bars are placed across transverse joints of concrete pavement to allow movements. The IDBI dowel bar inserter provided easy and accurate bar placement. To be effective, only one half of the dowel rod is debonded (i. Efficient use of steel. Dowel bars and dowel bar assemblies (dowel baskets used to support the dowels at the proper position) must be coated with a fusion-bonded epoxy coating, which conforms to AASHTO M 254, with the exceptions listed in 709. Results indicated that dowel behavior in action against the concrete cover is similar to action against the core before a split crack separates the cover from the core. SurePoxy 116 is our most rapid-setting, moisture insensitive, high strength epoxy resin system designed for anchoring threaded rod and rebar into concrete, and for buttering cracks prior to injection. The plastic Dowel Sleeve holds each dowel in proper horizontal alignment for the best possible load transfer between sections. concrete dowel bars