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http://dx.doi.org/10.12989/acc.2022.13.3.265

Bond behaviour at concrete-concrete interface with quantitative roughness tooth  

Ayinde, Olawale O. (College of Civil and Transportation Engineering, Hohai University)
Wu, Erjun (College of Civil and Transportation Engineering, Hohai University)
Zhou, Guangdong (College of Civil and Transportation Engineering, Hohai University)
Publication Information
Advances in concrete construction / v.13, no.3, 2022 , pp. 265-279 More about this Journal
Abstract
The roughness of substrate concrete interfaces before new concrete placement has a major effect on the interface bond behaviour. However, there are challenges associated with the consistency of the final roughness interface prepared using conventional roughness preparation methods which influences the interface bond performance. In this study, five quantitative interface roughness textures with different roughness tooth angles, depths, and tooth distribution were created to ensure consistency of interface roughness and to evaluate the bond behaviour at a precast and new concrete interface using the splitting tensile test, slant shear test, and double-shear test. In addition, smooth interface specimens and two separate the pitting interface roughness were also utilized. Obtained results indicate that the quantitative roughness has a very limited effect on the interface tensile bond strength if no extra micro-roughness or bonding agent is added at the interface. The roughness method however causes enhanced shear bond strength at the interface. Increased tooth depth improved both the tensile and shear bond strength of the interfaces, while the tooth distribution mainly influenced the shear bond strength. Major failure modes of the test specimens include interface failure, splitting cracks, and sliding failure, and are influenced by the tooth depth and tooth distribution. Furthermore, the interface properties were obtained and presented while a comparison between the different testing methods, in terms of bond strength, was performed.
Keywords
bond strength; cohesion; double-shear test; friction coefficient; precast and new concrete; quantitative roughness; slant shear test; splitting tensile test;
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