抗剥落剂对花岗岩改性沥青混合料水稳定性的影响

黄丽卿，赖晓龙，孙华

福建林业职业技术学院交通工程系，福建南平353000

摘要：为缓解道路建设压力，在我国沥青路面气候分区的夏炎热冬温潮湿（1-4-1）区，研究采用花岗岩为骨料的沥青玛蹄脂碎石（stone matrix asphalt，SMA）改性混合料的水稳定性。选用3种非胺类抗剥落剂进行优选试验，分析抗剥落剂对苯乙烯-丁二烯-苯乙烯嵌段共聚物（styrene butadiene styrene，SBS）改性沥青性能及SBS改性沥青与花岗岩集料黏附性的影响，对比同级配下花岗岩SMA-13和石灰岩SMA-13改性沥青混合料的水稳定性。结果表明：非胺类抗剥落剂能改善SBS改性沥青与花岗岩集料的黏附性，采用Ⅲ号抗剥落剂可明显提高花岗岩SMA-13改性沥青混合料的马歇尔稳定度、浸水残留稳定度和冻融劈裂抗拉强度比，减小浸水飞散损失比；选择优质花岗岩集料和Ⅲ号抗剥落剂，花岗岩SMA-13改性沥青混合料的水稳定性优于同级配的石灰岩SMA-13改性沥青混合料。

关键词：抗剥落剂；花岗岩；改性沥青；SMA-13；黏附性；水稳定性

Effect of anti-stripping agent on moisture susceptibility ofgranite modified asphalt mixture

HUANG Liqing, LAI Xiaolong, SUN Hua

Department of Transportation Engineering，Fujian Forestry Vocational and Technical College，Nanping 353000，China

Abstract:To relieve the pressure of road construction, the moisture susceptibility of stone matrix asphalt (SMA) modified asphalt mixture using granite as aggregate is studied in the hot summer and humid winter areas (1-4-1) of asphalt pavement climatic zone. Three kinds of non-amine anti-stripping agents are selected for the optimization test. The performance of modified asphalt with anti-stripping agent and the bonding performance between modified asphalt and the granite aggregate are studied. The moisture susceptibility of granite SMA-13 and limestone SMA-13 under the same gradation is compared. The result shows that the nonamine anti-stripping agent can improve the adhesiveness of modified asphalt and granite aggregate. The Marshall stability, immersion residual stability and freeze-thaw splitting tensile strength ratio of granite SMA-13 modified asphalt mixture are greatly improved, and the immersion dispersion loss ratio is reduced with the No. III anti-stripping agent. The high quality granite aggregate and anti-stripping agent is selected, the water stability of granite SMA-13 modified asphalt mixture is better than that of limestone SMA-13 asphalt mixture.

Keywords:anti-stripping agent; granite; modified asphalt; SMA-13; adhesiveness; moisture susceptibility