Influence of Primer on Bond Integrity between Concrete-Polymer Cement Mortar at Elevated Temperature: in Tension, Shear and Moment

Khuram Rashid, Dawei Zhang, Tamon Ueda


In this experimental investigation, influence of temperature was investigated on composite specimens, which were prepared by spraying polymer cement mortar (PCM) on treated surface of concrete. The weakest part of the composite specimen is interface between concrete and PCM. To strengthen this part, primer was used which dense the interface. Two types of composite specimens were prepared in this experimental work, one by using primer at interface and second was without using it. Bond integrity of both types of composite specimens were investigated in tension, shear and moment. Tensile behavior was investigated by conducting interfacial split tensile strength and shear behavior was evaluated by conducting Bi-Surface shear strength. While moment was investigated by performing three and four point loading tests on strengthened beams. All tests were performed at 20 and 60oC. Reduction in interfacial tensile strength, interfacial shear strength and ultimate moment were observed at elevated temperature. Failure mode of strengthened beams also shifted from flexural to debonding mode. While the influence of primer was ignorable in this work.

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