摘要
为研究盐渍侵蚀下高模量沥青及其混合料的性能,将高模量试件在不同浓度的人工海水中浸泡不同的时间。通过软化点、开裂温度和车辙因子3个指标来评价盐渍侵蚀对高模量沥青性能的影响,通过车辙试验和马歇尔稳定度试验评价盐渍侵蚀对混合料的影响。结果表明,盐分条件的存在,较明显地增加了高模量沥青胶结料的软化点值,人工海水的存在并没有对高模量沥青的高温性能造成较大的影响。随着人工海水溶液浓度的升高,高模量沥青的开裂温度不断下降,在低温且有盐渍侵蚀下的地区,高模量沥青的使用需要更加谨慎。在5%溶液浓度浸泡14 d下,高模量沥青60℃和76℃下的车辙因子仍能达到高模量沥青的性能要求。随着溶液浓度的增加,沥青混合料的马歇尔稳定度显著减小,人工海水溶液浓度的增加会减弱沥青混合料的高温性能和基本物理性能,但高模量沥青混合料的性能减弱的幅度较小,在盐渍侵蚀下表现出较优越的性能。
In order to study the effect of artificial seawater on high modulus asphalt and it＇s mixture of high temperature and basic performance,high modulus of specimens immersed in a different time with different concentrations of artificial seawater were made. By softening point,cracking temperature and rutting factor,the impact of artificial seawater on high modulus asphalt performance was studied. Through rutting test and Marshall stability test,the impact of the artificial seawater on asphalt mixtures was evaluated. The results showed that the softening point of the high modulus asphalt binder was increased by the presence of salinity conditions. Artificial seawater did not cause a greater impact on the performance of high-temperature high modulus asphalt. With the concentration of artificial sea water rising,cracking temperature of high modulus asphalt was falling,and there is salted erosion in low temperature areas under high modulus asphalt need to be more cautious. At 5% concentration soaked 14 d,rutting factor 60 ℃ and 76 ℃ of high modulus asphalt can still achieve high modulus asphalt performance requirements. With concentration increasing,the Marshall stability of asphalt mixture significantly was reduced. With the concentration of artificial seawater increasing,the mixtures high temperature performance and basic physical properties were weaken,but high modulus asphalt mixture exhibited relatively superior performance.
出处
《科学技术与工程》
北大核心
2015年第27期184-187,共4页
Science Technology and Engineering
基金
广州航海学院创新强校工程建设项目
广州航海学院校级科研项目(A330120、A442036、K3140219、A422036)资助
关键词
人工海水
盐渍侵蚀
高模量沥青
高温性能
artificial seawater salted erosion high modulus asphalt high temperature performance
