Liu Yunpeng

Preliminary Study on Asphalt Emulsion Used in Cement Asphalt Mortar

Asphalt emulsion is an important component in the preparation of cement asphalt mortar. In the work reported here, different emulsifiers and basic asphalts were used to manufacture emulsions and their properties were investigated. Results indicate that a diamine-based emulsifier renders asphalt emulsion that exhibits better compatibility with cement; lower density and higher ductility basic asphalt; and that styrene-butadiene-styrene modifiers are more appropriate in the manufacturing of emulsion.

Bonding Durability of Two Repair Mortars with Low Modulus Cement and Asphalt Mortar (CA Mortar)

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.