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试验发现高温拌和时沥青混合料中加入的抗车辙剂可部分溶解于沥青中,而大部分与矿料相混合。基于此,论文提出双重改性原理,阐述分析抗车辙剂大幅度提高沥青路面或机场跑道高温稳定性的原因所在。改性途径之一在于溶解于沥青中的抗车辙剂能从多方面影响沥青的技术性能,如提高沥青黏稠性和高温稳定性,同时保持沥青的低温性不受影响。改性途径之二是未溶解于沥青中的抗车辙剂在高温拌和时,以黏流体状态将矿料颗粒胶结在一起,不仅强化矿料颗粒之间的黏结程度,同时黏聚在一起的矿料颗粒以聚集团的形式,使原有沥青混合料由悬浮结构向准骨架嵌挤结构转换,进一步提高沥青混合料的高温稳定性。间接剪切试验表明,抗车辙剂沥青混合料的c、φ值在不同温度条件下都有显著提高,直接验证了抗车辙剂双重改性机理。
It was found that the anti-rutting agent added to the asphalt mixture at high temperature can be partly dissolved in the asphalt, while the majority of the anti-rutting agent mixed with the mineral material. Based on this, the paper proposes the principle of double modification, and expounds the reason why the anti-rutting agent greatly improves the high temperature stability of asphalt pavement or airport runway. One of the avenues for modification is that the rut resistance dissolved in the bitumen can affect the technical performance of the bitumen in many ways, such as increasing the bitumen viscosity and high temperature stability while maintaining the bitumen’s low temperature properties unaffected. Modification of the second approach is not dissolved in asphalt in the anti-rutting agent mixing at high temperatures, the state of viscous fluid cement particles together, not only to strengthen the degree of bonding between mineral particles, while cohesion of the ore Aggregate particles in the form of aggregates, the original asphalt mixture from the suspended structure to the quasi-skeleton embedded crowded structure conversion, and further improve the high temperature stability of asphalt mixture. Indirect shear tests show that the c, φ values of anti-rutting agent asphalt mixtures have significantly increased under different temperature conditions, directly verifying the double modification mechanism of anti-rutting agent.