alternative material dowel bars for rigid pavement joints

An Alternative to Traditional Round Dowel Bars

joint for traditional 1¼ in. round dowel bars and equivalent alternative dowels. As illustrated, the limited increase in bearing area of a square dowel bar also limits its additional spacing when compared to a round dowel bar so a joint with square dowel bars will use more steel than one with round dowel bars…

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Dowel and Tie Bars in Concrete Pavement Joints: Theory …

• Dowel bars • Placed across transverse joints at the mid-depth of the slab • Transfer load from one slab to another without preventing the joint from opening • Commonly made of round, smooth, epoxy coated steel bars • Reduce joint faulting and corner cracking Dowel and Tie Bars 2nd International Conference on Best November 2, 2011

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Rigid pavements

 · 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.

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

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.

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Airfield Joints

The dowel bars are used as a precaution to maintainjoint performance in case some opening of the perimeter joints might occur. Sealing Joints. Joint sealants are used in airfield pavement joints to keep out incompressible material and to minimize infiltration of water.

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CONCRETE ACCESSORIES JOINT DOWELING SYSTEMS

Properly aligned, smooth dowels allow the joint to open as concrete shrinks." ACI 302.1R-04 3.2.7 "Dowels across pavement joints can provide load transfer while permitting the joints to move. When dowels are used, their correct alignment and lubrication is essential for proper joint function." ACI 330R-08 3.8.2 "The dowels should be ...

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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

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Joints in Rigid Pavement

 · The movement is restricted by subgrade friction. Design involves the length of the slab given by. 3. Longitudinal Joints. Longitudinal joints are required when pavement width is more than 4.5m. Across longitudinal joints, tie bars are provided. These are the main types of joints in the rigid pavement. If you have any doubt, please free to mail me.

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Dowel Bar Placement – Pavement Interactive

Dowel Bar Locations. The conventional approach to dowel bar placement in new pavement construction is to place 11 bars for a 12-foot lane, starting with the first bar located 12 inches from the pavement edge, with all of the bars placed 12 inches apart from the next adjacent bar. For a dowel bar retrofit, this is modified to place three or four ...

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Retrofit Dowel Bars Restore Thin-Section Pavement ...

 · Dowel bar retrofit (DBR) is a load transfer restoration process that delivers a renewed level of structural strength to portland cement concrete pavement (PCCP). The process involves placing load transfer devices across transverse joints and/or cracks to …

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Misalignment of Dowel Bars in Rigid Pavement Joints ...

 · Satisfactory joint performance also depends on appropriate pavement design standards, quality construction materials and good construction and maintenance procedures. This research aims at structurally analyzing the effect of misalignment of dowel bars in rigid pavement joints on the joints performance and suggesting practical remediation.

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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.

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How to Design Plain Jointed Rigid Pavements for Highways ...

(x) At expansion joints of 20 mm width, dowel bars of 25 mm across and 500 mm long are used at 250 mm intervals. (xi) Only stresses due to wheel load and warping are considered for thickness design. Wheel load repetitions and fatigue consumption value need not be considered.

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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. The design load is a 9,000-lb dual wheel load centered 6" from the slab edge. Assume a 12" dowel spacing. 16

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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

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Correcting Problem Concrete Pavements

joint material blows out Š you must immediately re-seal the joint, especially before material can get ... vestigated alternative ways of rehabilitating older concrete pavements,fl Correa says. fiThe Wisconsin ... dowel bars as part of their concrete pavement main-tenance or rehabilitation programs.

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Experimental Study of Dowel Bar Alternatives Based on ...

2.4. Dowel Bars. In the experiment, steel dowels and FRP dowels are considered, and the cross-sections of the dowel bars are round, elliptical, and square (see Table 4 and Figure 2).Among them, 10 round steel bar, square steel bar (8.9 mm × 8.9 mm), and elliptical steel bar (major axis = 12.5 mm, minor axis = 8 mm) have the same cross-section area, so as to evaluate the optimal cross-section ...

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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.

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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

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(PDF) Dowel and Tie Bars in Concrete Pavement Joints ...

Dowel and Tie Bars in Concrete Pavement Joints: Theory and Practice Lev Khazanovich Associate Professor University of Minnesota November 2, 2011 2nd International Conference on Best Practices for Concrete Pavements Presentation Outline • Introduction • Pavement joints, dowels, and tie bars • Benefits of dowel and tie bars • Dowel and tie bar design • Construction • Summary November ...

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Rigid pavement design

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.

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Determination of Stresses and Displacements in Rigid ...

may be load transfer devices at transverse joints, called dowels, and steel bars at longitudinal joints [4]. Rigid pavements must be analyzed with the plate theory, instead of the elastic layer theory, due to the high rigidity of concrete slabs and also to the presence of discontinuities (joints and cracks) in them [5].

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Concrete Jointing and Details: Thickness is Only the Start

without contraction joints in between to control transverse cracking. 2. the pavement is constructed while ambient temperatures are below 40°F (4°C). 3. the contraction joints are allowed to be infiltrated by large incompressible materials. 4. the pavement is constructed of materials that in the past have shown high expansion characteristics.

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Pavement Manual: Rigid Pavement Design

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.

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Alternative Material Dowel Bars for Rigid Pavement Joints

joints in rigid joint pavement, there are other factors involved in many failures. Due to the lack of data in most DOTs to make an engineering assessment of the cost of corrosion associated with the failures and subsequent repairs, it makes it difficult to present a savings figure to offset the higher

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Paving The Way | FHWA

The second study looked at the early-age behavior of dowel bars in rigid pavement. One of the major rehabilitation costs for pavements is the repair of prematurely deteriorated transverse contraction joints that can result from lack or improper placement of dowels (tube-like bars …

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"Alternative Material Dowel Bars for Rigid Pavement Joints ...

Over the last thirty to forty years, dowel support of the joint in Rigid Joint Pavement (RJP) has been widely used. The problem of deterioration of concrete pavement joints has resulted in the search for alternate solutions. Fiber-reinforced polymer (FRP) and stainless steel represent corrosion resistant alternatives to conventional galvanized steel in this application.

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450 Rigid Pavement

Joint Score (JS) – Evaluated for a single transverse joint between adjacent longitudinal joint(s) and/or pavement edge(s) (i.e., a typical 12 ft [3.6 m] standard lane or up to 14 ft [4.3 m] widened lane), and calculated as: where: n = number of dowels in the single joint . W i = weighting factor (Table 451.09-3) for dowel i. The Joint Score threshold for a locked joint of 10 (JS=10), was ...

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ASSESSMENT OF DOWEL BAR RESEARCH

Assessment of Dowel Bar Research Abstract This report presents the latest technological gaps in dowel bar research based upon completed and ongoing dowel bar research from across the nation. In order to obtain this collection of informa-tion about dowel bars, a search was conducted on a nationwide level. The technological gaps and

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Pavement Design Manual

 · Longitudinal Joint: A pavement joint, in the direction of traffic flow, used to control longitudinal cracking on a rigid pavement or the joint formed between adjacent passes of a paver on a flexible pavement. Loss of Support (LS): A factor included in the design of rigid pavement to account for the potential loss of

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NONCORROSIVE DOWEL BARS TO BE EVALUATED

Experimental Study of Dowel Bar Alternatives Based on ...

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801 2/11/2020 RIGID PAVEMENT RESTORATION DETAIL

tie bar ~ #5 bar x 30" long on 36" centers dowel bar ~ 1 1 2" diam x 18" long on 12" centers drill and grout when widening existing pavement with pccp d d d d d d d sawed groove ~ width 3 16" min, 5 16" max depth 1" min see std spec 5-05.3(8)b d/3 d/4 d/2 d/2 d/2 15" 9" #5 bar ~ 18" long @ 12" spacing section view longitudinal contraction joint ...

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Summary Report on Dowel Bar Retrofit for Rigid Pavements

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 .

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Misalignment of Dowel Bars in Rigid Pavement Joints ...

 · Misalignment of Dowel Bars in Rigid Pavement Joints. The performance of concrete pavements depends to a large extent upon the satisfactory performance of the joints. Most jointed concrete pavement failures can be attributed to failures at the joint, as opposed to inadequate structural capacity (FHWA, November 30, 1990).

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EVALUATION OF THE DESIGN TECHNIQUES OF RIGID PAVEMENT

Many rigid pavements have dowel bars across the joints to transfer loads between slabs. Pavements with dowel bars at the joints are typically designed with a J value of 3.2. Ec: It is derived from the stress-strain curve as taken in the elastic region, the modulus of elasticity is also known as Young''s modulus.

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WELDED WIRE MESH FOR ROADS / HIGHWAYS

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 …

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