Abstract
This chapter illustrates the recent results on the studies of durability enhancements of concrete bridge deck. Fatigue performance of cementitious material can be significantly improved by adding fibers. With the same maximum load level, the fatigue life can be prolonged by several orders of magnitude depending on the fiber types and content. The fatigue crack growth rate in fiber reinforced cementitious composite is found to be governed by the crack bridging degradation behavior of the composite in the fracture zone. In a composite slab containing both plain concrete and ECC strips, with proper design at the ECC/concrete interfaces, and careful selection of material properties (that is, to assure that the tensile strength of concrete is higher than that of ECC material), it is possible to localize the tensile deformation into the ECC strip instead of cracking in the concrete section. Due to the strain hardening performance of the ECC material with high strain capacity (up to 5%), the overall strain capacity and the integrity as well as the fatigue durability of the composite slab can be significantly improved.
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