沥青发泡特性的优化

Optimization of Asphalt Foaming Characteristics

为了优化沥青的发泡性能,采用5种表面活性剂及2种添加方式、6种发泡用水量及2种发泡水温进行沥青发泡试验,并进行不同发泡特性泡沫沥青拌制的泡沫沥青混合料的性能试验.结果表明:添加表面活性剂可以明显提高泡沫沥青半衰期,但不能有效改善泡沫沥青膨胀率;采用在沥青中添加阳离子表面活性剂、提高发泡用水量和发泡温度等综合技术措施,可以同时改善泡沫沥青的膨胀率和半衰期;泡沫沥青发泡效果对泡沫沥青混合料的劈裂强度、干湿劈裂强度比、冻融劈裂强度比和弯曲应变没有明显影响,但是对混合料疲劳寿命有较为显著的影响,良好的沥青发泡效果有利于混合料的长期性能.

In order to optimize asphalt foaming characteristics,asphalt foaming tests using five surfactants and two ways of surfactant addition,six use levels of foaming water and two foaming water temperatures were conducted.Then,the performance tests of foamed asphalt mixtures made by foamed asphalts with different foaming characteristics were conducted.The results show that the surfactants can significantly improve the half-life of foamed asphalt,however,it can＇t effectively improve the expansion rate of foamed asphalt.The expansion rate and the half-life of foamed asphalt can be improved by adding a cationic surfactant,increasing use level of foaming water and foaming water temperature.The foaming characteristics of foamed asphalt has no significant effect on the indirect tensile strength（ITS）,dry-wet tensile strength ratio,freeze-thaw tensile strength ratio and flexural strain of asphalt mixtures,but has significant effect on the fatigue life.The foamed asphalt mixture made by foamed asphalt with good foaming characteristics has a better long-term performance.