The influence of interfacial bond between substrate and overlay concrete by bi-surface shear test and split prism test
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Abstract
The interfacial bonding between damaged concrete structures and newly applied repair materials is one of the significant issues for the structure’s functionality, safety, and durability. To prevent failure, a strong bond is required at the interface. This paper investigates the interfacial bond strength for different concrete mixes and the surface patterns used. In the present experimental study, three concrete mixtures, M20, M30, and M45 were used for substrate concrete casting, and based on the 28 days strength of substrate concrete, the concrete overlay mix of the same strength was used. Rectangular groove, V-type groove, U-type groove, S-type groove, Trapezoidal groove patterns, and As-cast with or without an Epoxy-based agent were used as different surface profiles on the substrate surface. Two types of direct shear tests, the Bi- Surface Shear test and the Splitting Prism test, were used to measure the bond strength after 28 and 56 days. The results concluded that at 28 and 56 days, the RG and EB had higher bond strength compared to the As-cast for both BSST and SPT.
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