基于沥青与集料界面粘附性的抗剥落剂的开发

Development of new anti-stripping agent based on adhesion of asphalt with aggregate

为研究沥青与集料的粘附性,定量测定了沥青各组分与集料粘附性的大小。对沥青电性能、接触角、粘度与粘附性关系进行了探讨。研究了集料ζ电位、粒径对粘附性的影响。结果表明ζ电位值与粘附性有较好的相关关系,其值越大,粘附性越好;与大粒径集料不同,细集料粘附性似乎取决于表面积的大小,而与集料化学组成关系不大;从水煮处理花岗岩能提高粘附性现象出发,研制出抗剥落剂。该抗剥落剂处理集料表面能提高混合料水稳定性及高温稳定性,配制的改性沥青能极大提高沥青混合料高温性能。

Adhesions of different asphalt constituent with aggregate were accurately measured. The relationship between electric property, contact angle, viscosity and adhesion was studied. The effect of aggregate’s ζ-electric potential, surface area on adhesion was studied. Experimental results show that the larger the ζ-electric potential is, the better adhesion of aggregate with asphalt is; the adhesion of fine aggregate with asphalt is related to its surface area, and has little relation with chemic properties of aggregate; the adhesion of granite can be improved when the granite is treated by boiling water.Based on those results, an anti-stripping agent was developed. If aggregate surface is treated, the anti-stripping agent can improve its water damage resistance, and high temperature property of asphalt is modified, the anti-stripping agent can greatly increase its rut-resistance ability.