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Alternative Material Dowel Bars For Rigid Pavement Joints

Alternative Material Dowel Bars For Rigid Pavement Joints

News Introduction: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 ...

Load Transfer Characteristics and Durability Study of GFRP

The corrosion of steel dowels in concrete pavement can compromise the load transfer capability of joints and lead to premature damage. To solve this problem, the non-corrosive glass fibre reinforced polymers (GFRP) bar has been used as dowels in concrete pavement instead of the steel dowels.This thesis demonstrates the Load Transfer Characteristics of a GFRP dowels with the help of a 3D finite

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.

The 1.5-in (38 mm) FRP dowels with polyester resin and E-glass exhibited generally low LTE values, and are not providing performance comparable to that of the 1.5-in (38-mm) epoxy-coated mild steel dowel bars. The evaluation of alternative stainless steel clad dowels and concrete filled stainless steel tubes or pipes (Type 304 or Type 316) was

[PDF] Evaluation of alternative dowel bar materials and

[PDF] Evaluation of alternative dowel bar materials and

Joint width is 3.0 cm and the permissible stress in shear, bending and bearing stress in dowel bars are 1000,1500 and 100 respectively. Design the length and spacing of tie bars given that the pavement thickness is 20cm and width of the road is 7m with one longitudinal joint.

Isolation joints are used at the intersection of pavements with structures, and in some cases, within pavements. Construction joints are required between paving lanes, and at the end of a pour. In contrast to contraction joints, construction joints have formed joint surfaces with load transfer taking place through keys and tie bars.

Nov 20, 2016 Dowel bars also move along with the slab, occupying the space in the metal cap attached at the end of each dowel bar. AND, During cold climate slabs contracts and gap increases and dowel bars also move along with slab. The compressed filler board may partly recover and joint sealer moves down. 23 24.

Dowel Bars at Joints) Dowel Joints are provided every 6 to 10 m. US Army Corp- Reinforced Rigid Pavement design EM 1110-3-132 of 9 Apr 84 CONTINUOUSLY REINFORCED CONCRETE PAVEMENTS Continuously Reinforced Concrete Pavments are the most popular alternative for

Rigid Pavements and Concrete Materials Branch . – Smooth dowel bars used at transverse joints for load transfer – Transverse joints spaced at 15 foot intervals – Feasible rehabilitation alternative for PCC pavement for practically all conditions

Concrete Paving Selections

Concrete Paving Selections

IGGA Guide Specification: Dowel Bar Retrofit (DBR

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. Slots are cut using diamond-tipped saw blades; the concrete is removed using lightweight jackhammers. The

Dowel Bars. Dowel bars are short steel bars that provide a mechanical connection between slabs without restricting horizontal joint movement. They increase load transfer efficiency by allowing the leave slab to assume some of the load before the load is actually over it. This reduces joint deflection and stress in the approach and leave slabs.

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 .

Summary Report on Dowel Bar Retrofit for Rigid

Summary Report on Dowel Bar Retrofit for Rigid

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

Dowel bar retrofit performance in Wisconsin.

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

MECHANISTIC ANALYSIS OF RIGID PAVEMENTS | Request

MECHANISTIC ANALYSIS OF RIGID PAVEMENTS | Request

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.

Chapter 5 - Technical Considerations: Jointing and Joint

Chapter 5 - Technical Considerations: Jointing and Joint

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.

AC 150/5320-6F, Airport Pavement Design and

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

Dowel Bars. Dowel bars are short steel bars that provide a mechanical connection between slabs without restricting horizontal joint movement. They increase load transfer efficiency by allowing the leave slab to assume some of the load before the load is actually over it. This reduces joint deflection and stress in the approach and leave slabs.

Concrete Pavement Construction Basics Placing dowel baskets Dowel bars transfer heavy loads across joints in the pavement, preventing faulting at the joint that can lead to pavement damage. Practices vary from state to state, but dowel bars are typi-cally required in eight-inch or thicker pavements.

Concrete Pavement Construction Basics - Iowa

Concrete Pavement Construction Basics - Iowa

Dowel bars can be used in both new construction and rehabilitation projects such as slab replacement. In addition, they can be retrofitted into existing pavements that were built without dowel bars originally. Adding dowel bars can extend the service life of a pavement by improving load transfer and helping to prevent faulting at pavement joints.

1.1.2 Concrete Pavement Contraction Design (CPCD) CPCD has transverse joints spaced at regular intervals. The transverse joints are used to control temperature-induced contraction and expansion in the concrete. Smooth dowel bars are used at the transverse joints for load transfer. The transverse joints are spaced at 15 ft. intervals.

Hot Product

  • Standard Specification for Dowel Bars for Concrete …

    Standard Specification for Dowel Bars for Concrete …

    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) –

    READ MORE
  • BEST PRACTICES-LONG LIFE RIGID PAVEMENT …

    BEST PRACTICES-LONG LIFE RIGID PAVEMENT …

    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 …

    READ MORE
  • Summary Report on Dowel Bar Retrofit for Rigid …

    Summary Report on Dowel Bar Retrofit for Rigid …

    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 .

    READ MORE
  • EVALUATION OF ALTERNATIVE DOWEL BAR MATERIALS

    EVALUATION OF ALTERNATIVE DOWEL BAR MATERIALS

    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.

    READ MORE
  • (PDF) DIVISION OF DESIGN Office of Pavement Design

    (PDF) DIVISION OF DESIGN Office of Pavement Design

    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.

    READ MORE
  • Experimental Investigation of Effects of Dowel

    Experimental Investigation of Effects of Dowel

    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 ...

    READ MORE
  • Dowel bar retrofit performance in Wisconsin.

    Dowel bar retrofit performance in Wisconsin.

    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.

    READ MORE
  • MECHANISTIC ANALYSIS OF RIGID PAVEMENTS | Request …

    MECHANISTIC ANALYSIS OF RIGID PAVEMENTS | Request …

    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 ...

    READ MORE
  • 23.4 Roadway Pavement Design

    23.4 Roadway Pavement Design

    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.

    READ MORE
  • Experimental Analysis of Behaviour of Joints in Fibre

    Experimental Analysis of Behaviour of Joints in Fibre

    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

    READ MORE
  • Types of Joints concrete construction, Rigid Pavament,

    Types of Joints concrete construction, Rigid Pavament,

    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.

    READ MORE
  • City of Lincoln 2020 Standard Specifications Chapter 4

    City of Lincoln 2020 Standard Specifications Chapter 4

    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

    READ MORE
  • Chapter 5 - Technical Considerations: Jointing and Joint

    Chapter 5 - Technical Considerations: Jointing and Joint

    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.

    READ MORE
  • Fiberglas™ Dowel Bars - Owens Corning Composites

    Fiberglas™ Dowel Bars - Owens Corning Composites

    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.

    READ MORE
  • AC 150/5320-6F, Airport Pavement Design and …

    AC 150/5320-6F, Airport Pavement Design and …

    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.

    READ MORE
  • Three-dimensional modeling of rigid pavement : final

    Three-dimensional modeling of rigid pavement : final

    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 ...

    READ MORE
  • Dowel Bars – Pavement Interactive

    Dowel Bars – Pavement Interactive

    Dowel Bars. Dowel bars are short steel bars that provide a mechanical connection between slabs without restricting horizontal joint movement. They increase load transfer efficiency by allowing the leave slab to assume some of the load before the load is actually over it. This reduces joint deflection and stress in the approach and leave slabs.

    READ MORE
  • Concrete Pavement Construction Basics - Iowa

    Concrete Pavement Construction Basics - Iowa

    Concrete Pavement Construction Basics Placing dowel baskets Dowel bars transfer heavy loads across joints in the pavement, preventing faulting at the joint that can lead to pavement damage. Practices vary from state to state, but dowel bars are typi-cally required in eight-inch or thicker pavements.

    READ MORE

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