Adhesion in SBS Modified Asphalt Containing Warm Mix Additive and Aggregate System Based on Surface Free Theory
LI Bo1,2, ZHANG Zhihao1,2, LIU Xiang1,3, LI Xiaomin1, LU Zhenfeng3
1 Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070; 2 National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control,Lanzhou Jiaotong University, Lanzhou 730070; 3 School of Highway, Chang’an University, Xi’an 710064
Abstract: The contact angles between SBS modified asphalt containing 1.5%, 3% Sasobit and 0.5%, 1% Evotherm 3G warm mix additive and distilled water, glycerol and formamide were detected by the sessile drop method. Based on surface free energy theory, the key indexes were compared such as surface free energy and the cohesive power under anhydrous conditions and peeling work under aqueous conditions. At the same time, adhesion and compatibility rate between SBS modified asphalt containing warm mix additive and limestone aggregate system were analyzed. The results showed that sessile drop method could accurately detect contact angle between SBS modified asphalt containing warm mix additive and conventional detection liquid. The adhesion in the SBS modified asphalt containing warm mix additive and adhesion aggregate system could be characterized using cohesion work, adhesion work, peeling power, compatibility rate. The surface free energy and its components, cohesive power, compatibility rate of SBS modified asphalt would decrease as the Sasobit dosage increase, while they would increase as the Evotherm dosage increase. The adhesion difference in SBS modified asphalt containing warm mix additive and aggregate system could be reduced when water appeared in the system. Evotherm warm mix additive could improve water stability of SBS modified asphalt, and the Sasobit warm mix additive could increase the water sensitivity of asphalt mixture.
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2017, Vol. 31 
