Because steel dowel bars can corrode in rigid pavement joints, two types of alternative materials for these bars have been introduced into the market: fiber-reinforced polymer (FRP) composite and stainless steel. The Civil Engineering Research Foundation's Highway Innovative Technology Evaluation Center is currently conducting a 5-year group ...
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1.1. This specification covers the materials, manufacture, and supply of dowel bars for use in conventional and long-life concrete street and highway pavements. 1.2. Dowels are categorized according to primary material type (metallic or nonmetallic) and the type of corrosion protection coating used (e.g., none, metallic, or nonmetallic) –
The trends in structural design of rigid pavements have generally resulted in thicker slabs and shorter joint spacings (for JPCP) along with widespread use of corrosion-resistant dowel bars and stabilized base layers (especially asphalt stabilized). CRCP pavements have …
Dowel Bar Retrofit for Rigid Pavements Authors: John T. Harvey, Erwin Kohler, Nicholas Santero, Yi Bian, ... compared to the alternative of grinding without DBR. ... The independent action causes local damage to the base beneath the slab at the joint and migration of base material from under the downstream slab to under the upstream slab; and .
Evaluation and Testing Plan for Alternative Dowel Bars One of HITEC’s on-going projects is the evaluation of alternative dowel bars for load transfer in jointed concrete pavements. A variety of materials are being evaluated, including fiber reinforced polymer (FRP) bars, stainless steel bars and pipes, and conventional epoxy-coated dowel bars.
Misplaced or misaligned dowel bars at transverse joints can adversely affect the performance of concrete pavements. Misaligned dowel bars (see Figure 13) can lock up the joints and prevent them from opening and closing freely, which may result in the opening and deterioration of mid- slab cracks, as well as spalling and cracking near the joints.
Jan 01, 2006 These results indicate that (a) all pavement joints are initially locked, and opening displacements occur after the load per dowel exceeds 5 to 7 kN or the average bond shear stress exceeds 0.22 to 0.30 MPa; (b) for all misalignment types, the load per dowel increases with larger misalignment magnitudes and nonuniformity; (c) structural ...
In 1999, WisDOT constructed test sections on I-39 to evaluate the dowel bar retrofit (DBR) rehabilitation technique for faulted concrete pavement slabs. Two years later, mortar deterioration and debonding were noted in the dowel slots.
The dowel-pavement interaction effects are accounted for by employing contact elements between the pavement and the dowel bar. Keyed joint or aggregate interlock joint is assumed for the ...
23.4.1 Alternative Pavement Treatments The principal determinant in choice of roadway materials is the axle weight of the BRT vehicles selected for operation and the number of projected BRT vehicles likely to use the infrastructure over the projected service life of the road.
Rigid pavement, Construction joint 1. INTRODUCTION A long lasting, reliable and economical transportation ... potential of GFRC as an alternative construction material. Joints are used in concrete pavements in order to control ... expansion or isolation joints. Dowel bars are the standard for mechanical load transfer devices used in PCC pavements
Types of Joints concrete construction, joint filler, and sealer material. An effective system of joints is an essential feature in the successful functioning of ... Tie bars and dowel bars are provided to maintain the strength of the pavement at joints and also to act as load transfer devices.
D. METAL DOWEL OR EXPANSION BAR SLEEVE Metal or plastic sleeves for dowel or expansion bars shall be satisfactory to the City’s Project Manager and shall be of sufficient size and strength to permit the free sliding of the dowel bar after the concrete is in place. E. PREFORMED EXPANSION JOINT MATERIAL
Round dowel bars are used for load transfer. 2. A no-shrinkage, rapid-setting patching material is used to backfill the slots and encase the dowel bars. The material should be thermally compatible with the panel and existing pavement concrete material. 3. Dowel slots are provided as follows: a. Saw-cut in the existing pavement b.
Fiberglas™ Dowel Bars are used as a “load transfer” device between joints in concrete slabs. With 1/4 the weight of traditional steel dowels, they provide a mechanical connection between slabs but allow for horizontal contraction and expansion of the slab itself.
Added tables for minimum layer thickness for flexible and rigid pavement structures. 9. Added detail on reinforcement at a reinforced isolation joint. ... Dowels and Tie Bars for Joints.....3-50. Joint Sealants and Fillers. ... s on Existing Rigid Pavements.....4-16 4.11. Alternatives for Rehabilitation of Existing Pavement.
The dowel bars in the joints are modeled by the beam element, which includes flexural and shear deformations. Stresses, strains, and displacements are computed for body forces, traffic loads, and temperature changes individually so that the program can be used to obtain either total stresses for design, or strain changes to compare with ...