Interfacial and mechanical performance of grouted open-graded asphalt concrete with latex modified cement mortar

Abstract

Latex modifier can improve the homogeneity of cement mortar. In this paper, interfacial and mechanical performance of grouted open-graded asphalt concrete (GOAC) with latex modified cement mortar (LCM) are investigated. The fluidity, flexural strength and compressive strength of LCM with three different Latex contents were measured for selecting the optimum Latex content of cement mortar. Meanwhile, pull-out test and shear test were adopted to test the strength of LCM-Matrix asphalt concrete (MAC) interface and Cement-MAC interface. Moreover, rutting test, three point bending test, freeze-thaw splitting test, soaked Marshall stability test, fatigue test were adopted to compare the mechanical performance of GOAC with that of dense asphalt mixture. The results show that Latex modifier has a positive effect on the strength of cement mortar, but has a negative effect on its fluidity. Furthermore, 1.2% was the optimum Latex modifier content for LCM. Meanwhile, the average adhesive strength and shear strength of LCM-Asphalt mortar (AM) system is higher than that of Cement-AM system, increased by 34.3% and 20.6% respectively. It indicates that the LCM-MAC interface is stranger than Cement-MAC interface. Moreover, GOAC has better high temperature stability, moisture susceptibility and fatigue life than dense asphalt mixture. However, the brittle cracking resistance of GOAC is inferior to that of dense asphalt mixture.