United States Department of Transportation
i
Elimination of deck joints using a corrosion resistant FRP appproach.
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2009-09-01
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[PDF-2.16 MB]
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Edition:Final report; Mar. 2006-Mar. 2009.
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Abstract:The research presented herein describes the development of durable link slabs for jointless bridge decks based on
using a fiber reinforced polymer (FRP) grid for reinforcement. Specifically the ductility of the FRP material was
utilized to accommodate bridge deck deformations imposed by girder deflection, concrete shrinkage, and
temperature variations. It would also provide a cost-effective solution to a number of deterioration problems
associated with bridge deck joints.
The structural behavior of two types of FRP grid reinforced concrete slabs was investigated. A total of 11 slabs
were prepared and tested. Three slabs were made of plain concrete as controls. Three slabs were reinforced by
commercially available FRP grids. Three slabs were reinforced by lab-fabricated FRP grids. The remaining two
slabs were the pure grid panel (one from commercial source and the other fabricated in our lab). All the slabs
were tested using a three-point bending test configuration. Physical properties such as surface abrasion,
shrinkage, and coefficient of thermal expansion were also tested.
The design concept of link slabs was then examined to form the basis of design for FRP grid link slabs.
Improved design of FRP grid link slab/concrete deck slab interface was confirmed in the numerical analysis. The
mechanical properties between the FRP grid and concrete were evaluated. The behavior of the link slab was
investigated and confirmed for durability.
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