基于表面能理论研究盐冻循环对沥青-矿料界面粘附性的影响

发布时间：2018-03-24 01:03

本文选题：表面自由能　切入点：沥青-矿料界面　出处：《复合材料学报》2016年10期

【摘要】：根据表面能理论,采用接触角测量法测定盐冻循环前后苯乙烯-丁二烯-苯乙烯(SBS)、废胎胶粉(CR)和复合胶粉(CCR)3种聚合物改性沥青、石灰岩、玄武岩和花岗岩的表面自由能参数,分别计算出盐冻循环前后沥青-矿料系统的粘附功和剥落功,从而确定盐冻循环对沥青-矿料系统粘附和剥落特性的影响。结果表明:盐冻循环前后,沥青与矿料的粘附过程以及水侵入沥青-矿料界面的剥落过程的比表面自由能变化均为负值,说明沥青与矿料的粘附过程和剥落过程均自发进行;随着盐冻循环次数和盐浓度的增加,沥青-矿料系统粘附功逐渐减小,剥落功逐渐增大,粘附性和抗水损害能力逐渐减弱;当沥青种类相同时,沥青与石灰岩的粘附功最大,剥落功最小,沥青与花岗岩的粘附功最小,剥落功最大;当矿料种类相同时,CCR改性沥青与矿料的粘附功最大,剥落功最小,SBS改性沥青与矿料的粘附功最小,剥落功最大。
[Abstract]:Based on the theory of surface energy, the surface free energy parameters of three kinds of polymer modified asphalt, limestone, basalt and granite were measured by contact angle measurement before and after salt freezing cycle. The adhesion work and spalling work of bituminous aggregate system before and after salt freezing cycle were calculated respectively, and the effect of salt freezing cycle on adhesion and spalling characteristics of bituminous aggregate system was determined. The results showed that: before and after salt freezing cycle, The change of specific surface free energy of bitumen and aggregate adhesion process and water invasion bitumen-aggregate interface spalling process are all negative, which indicates that the adhesion process and spalling process of asphalt and mineral aggregate occur spontaneously. With the increase of salt freezing cycle times and salt concentration, the adhesion work of asphalt-aggregate system decreases gradually, the spalling work increases, the adhesion property and water damage resistance ability weaken gradually, and when the type of asphalt is the same, the adhesion work between asphalt and limestone is the greatest. When the type of mineral aggregate is the same, the adhesion work between CCR modified asphalt and mineral aggregate is the greatest, the spalling work is minimum, and the adhesion work between SBS modified asphalt and mineral aggregate is the minimum, and the spalling work is the largest.
【作者单位】：内蒙古工业大学土木工程学院;内蒙古农业大学能源与交通工程学院;
【基金】：国家自然科学基金(11462018) 内蒙古自然科学基金(2014MS0507)
【分类号】：U414

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