Investigating the Bonding Performance of Warm Mix Asphalt Binder and Mixture
CHEN Xuefeng1, YUN Guangkun1, WU Tewei1, YAN Lihui1, YAN Chuanqi2,*
1 China Communications Construction Group Southwest Construction Co., Ltd., Chengdu 610081, China 2 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Abstract: The aim of this study is to investigate the bonding performance of three types of warm mix asphalt (WMA) binders and mixtures, including Sasobit-modified asphalt, Evotherm-modified asphalt, and waste cooking oil (WCO)-modified asphalt. Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM) were used to observe the chemical composition of the warm mix additives and the phase structure of asphalt binders. Dynamic shear rheometer (DSR) was used to characterize the cohesion properties of asphalt, binder bond strength (BBS) test was used to characterize the adhesion properties of asphalt-aggregate, and Hamburg wheel tracking (HWT) test was used to characterize the resistance to deformation and stripping of asphalt mixtures. The HWT curve based on the separation deformation was used to characterize the resistance to water damage. The Cantabro loss test was used to characterize the resistance to looseness of asphalt mixtures. The results show that Sasobit improves the cohesion properties of asphalt but has a negative impact on the adhesion between asphalt and aggregates, while Evotherm and WCO have the opposite effect. In the mixture test, Sasobit significantly improves the resistance to deformation and stripping, slightly weakens the resistance to water damage, and significantly weakens the resistance to looseness, while Evotherm and WCO both have a negative impact. For the HWT test, the influence of cohesion properties is more significant, while for the Cantabro loss test, the influence of adhesion properties is more significant. The bonding performance of asphalt mixtures cannot be fully represented by the bonding performance of asphalt binders, and the effects of cohesion properties and adhesion properties should be considered comprehensively.
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2024, Vol. 38 
