基于表面理论的温拌SBS改性沥青-集料体系的粘附性

发布时间：2018-11-12 19:48

【摘要】：采用躺滴法检测了掺加1.5%、3%的Sasobit和0.5%、1%的Evotherm 3G制备得到的温拌SBS改性沥青与蒸馏水、甘油和甲酰胺3种液体的接触角;基于表面自由能理论,对比了温拌SBS改性沥青在无水条件下的表面自由能和粘聚功以及在有水条件下的剥落功;同时,考察了温拌SBS改性沥青和石灰岩质集料的粘附功和配伍率。结果表明:采用躺滴法可以准确检测温拌SBS改性沥青与常用检测液体的接触角;以粘聚功、粘附功、剥落功、配伍率作为评价指标可用于表征温拌SBS改性沥青-集料体系的粘附性;温拌SBS改性沥青的表面自由能及其分量、粘聚功、配伍率随着Sasobit掺量的增大而减小,但随着Evotherm温拌剂掺量的增加而增大;水的参与降低了温拌剂对SBS改性沥青-集料体系粘附性影响的差异;Evotherm温拌剂有助于改善温拌SBS改性沥青的水敏感性,Sasobit温拌剂增加了温拌SBS改性沥青的水敏感性。
[Abstract]:The contact angles of three kinds of liquids, which were prepared by adding 1.5% Sasobit and 1% Evotherm 3G, were measured by the method of lying drop. The contact angles of the three liquids, distilled water, glycerol and formamide, were measured. Based on the theory of surface free energy, the surface free energy and cohesive work of warm mixed SBS modified asphalt under anhydrous condition and the spalling work under water condition were compared. At the same time, the adhesion work and compatibility rate of warm mixed SBS modified asphalt and limestone aggregate were investigated. The results show that the contact angle between the warm mixed SBS modified asphalt and the commonly used liquid can be accurately detected by the lying drop method. The adhesive work, adhesion work, peeling work and compatibility rate can be used to characterize the adhesion of warm mixed SBS modified asphalt aggregate system. The surface free energy and its component, cohesion work and compatibility ratio of warm mixed SBS modified asphalt decreased with the increase of Sasobit content, but increased with the increase of Evotherm content. The effect of warm mixing agent on the adhesion of SBS modified asphalt to aggregate system was reduced by the participation of water, and the water sensitivity of warm mix SBS modified asphalt was improved by Evotherm warm mix agent, and the water sensitivity of warm mixed SBS modified asphalt was increased by Sasobit warm mix agent.
【作者单位】：兰州交通大学甘肃省道路桥梁与地下工程重点实验室;兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室;长安大学公路学院;
【基金】：国家自然科学基金(51408287) 长江学者和创新团队发展计划滚动资助(IRT_15R29) 甘肃省自然科学基金(1506RJZA064) 兰州交通大学优秀科研团队资助(201606)
【分类号】：U414

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