EXPLORATORY EVALUATION OF MODE-I FRACTURE TOUGHNESS OF CONCRETE-COMPOSITE BONDED INTERFACES

Abstract eng:
In this paper, a conventional test method based on a three-point bending beam (3PBB) specimen, used commonly for determining Mode-I fracture properties of concrete and rock, is adapted to characterize Mode-I fracture of concrete-composite bonded interfaces. Two types of fiber fabrics: E-glass and Carbon are used, and a common epoxy resin is applied to bond the concrete-concrete and concrete-composite interfaces. Mode-I fracture tests of the 3PBB specimens for concrete-concrete, concrete-E-glass/epoxy composite, and concrete-Carbon/epoxy composite bonded interfaces are performed to determine the applied loads and load point displacements, from which critical strain energy release rates are reduced. The effect of loading rates on fracture toughness (in displacement control rates of 0.002 mm/sec, 0.01 mm/sec, and 0.05 mm/sec) is studied and discussed. It is expected that the proposed experimental method can be used to obtain fracture toughness data useful for delamination studies under various environmental exposures and service loading.

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