Interfacial Tensile Bond between Substrate Concrete and Repairing Mortar under Freeze-Thaw Cycles

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  • Qian Ye
    Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY, USA.
  • Zhang Dawei
    College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, China.
  • Ueda Tamon
    Division of Engineering and Policy for Sustainable Environment, Hokkaido University, Sapporo, Japan.

Abstract

<p>Freeze-thaw cycle is one of the major damage factors of concrete patch repair. Not only the material itself but also the adhesive interface is damaged under freeze-thaw cycles (FTC). Air-entraining agent has long been used to increase the freeze-thaw resistance of concrete materials. However, the effect of air-entraining agent on the adhesive interface has not been explored. The degradation mechanism and failure mode of concrete repair system under FTC has not been studied, either.</p><p>In this study, three kinds of substrate concrete were casted and repaired by two kinds of ordinary Portland cement mortars and one kind of polymer-modified cement mortar (PCM), respectively. With up to 150 FTC, splitting tensile strength and failure modes of composite specimens were experimented. Results showed that air-entraining agent in the repairing mortar greatly influenced adhesive tensile strength under FTC. The water cement ratio and air-entraining agent of substrate concrete insignificantly affected the adhesive interface, but affects failure mode. The adhesive tensile strength of PCM-repaired composite specimens decreased faster than that of ordinary Portland cement mortar-repaired composite specimens although PCM itself showed stronger freeze-thaw resistance than ordinary mortar.</p>

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