Abstract
Abstract This paper presents the results of a study investigating the bonding performance of two type repair materials, resin mortar (RM) and sulphoaluminate cement-asphalt emulsion mortar (SACR), with substrate cement and asphalt mortar (CA mortar) when repair systems are subjected to freezing-thawing cycles and thermal shock. Double-ring shear tests and three-point bending tests were employed to evaluate the bonding durability for the two repair systems, respectively. Two parameters named “bonding before freezing-thawing” and “bonding after freezing-thawing” were employed to better investigate the bonding durability when repair systems were subjected to freezing-thawing cycles. The results indicate that the thermal expansion coefficient difference between RM and substrate CA mortar is the main cause of their bonding failure. The bonding failure between SACR and substrate CA mortar in the freezing-thawing tests could be related to the decrease in substrate mortar and repair mortar strength. Besides, their bonding showed more stable performance in the thermal shock experiment due to their similar thermal expansion properties.
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