Journal
ENGINEERING STRUCTURES
Volume 32, Issue 1, Pages 207-217Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2009.09.007
Keywords
Boundary Elements Method; Finite Differences Method; Wave propagation; In situ non-destructive method; Concrete-to-concrete interface; Surface roughness
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In structural concrete codes, the design expression to assess the shear strength of concrete-to-concrete interfaces is based on the shear-friction theory. In these, the shear strength is highly dependent on the surface roughness of the concrete substrate. Recent studies have focused in the texture characterization of concrete surfaces and some in situ methods have been developed in this scope. However, with these methods the surface texture can only be assessed before applying the concrete overlay. In this paper, a study on the viability of developing a non-destructive test to assess the surface roughness of a concrete substrate after applying the overlay is presented. An ultrasound-based method was considered and the Boundary Elements and Finite Differences Methods were chosen to simulate two-layer slabs with different materials and interface textures. Experimental tests were also conducted to validate the numerical results. It was concluded that an ultrasound based method can be used to characterize the interface texture of homogeneous two-layer slabs but further research is needed for heterogeneous materials, such as concrete. (C) 2009 Elsevier Ltd. All rights reserved.
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