摘要
采用纳米CaCO_(3)和苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)作为外加剂制备纳米CaCO_(3)/SBS复合改性沥青。通过测试基本物理性能确定了外加剂的最佳掺量,通过流变性能测试、离析试验、荧光显微镜观察及热重分析等考察了沥青的性能及微观形貌。结果表明,两种外加剂复配的最佳比例为5%(质量分数,下同)的纳米CaCO_(3)和4%的SBS;在纳米CaCO_(3)改性沥青中掺加SBS后,复合改性沥青在不同温度下的黏度增大,高温抗车辙能力增强,低温性能得到明显改善,储存稳定性良好;纳米CaCO_(3)分子、SBS分子和基质沥青分子三者具有良好的相容性,经复合改性后沥青的热稳定性增强。
Nano-CaCO_(3) and styrene-butadiene-styrene block copolymer(SBS)were used as additives to prepare nano-CaCO_(3)/SBS composite modified asphalt.The optimum amount of admixture was determined by testing basic physical properties,the performance and micro morphology of asphalt were investigated by rheological property and segregation test,fluorescence microscope observation and thermogravimetric analysis.The results showed that the best proportion of the two admixtures was 5%(mass fraction,the same below)of nano-CaCO_(3) and 4% of SBS.After adding SBS into nano-CaCO_(3)modified asphalt,the viscosity of the composite modified asphalt increased at different temperatures,high temperature rutting resistance and low-temperature performance was significantly improved,and storage stability was good.Nano-CaCO_(3) molecule,SBS molecule and matrix asphalt molecule had good compatibility,and the thermal stability of asphalt was enhanced because of the composite modification.
作者
王鹏飞
李文霞
孙吉书
WANG Peng-fei;LI Wen-xia;SUN Ji-shu(China Railway 14th Bureau Group 2nd Engineering Co Ltd,Taian 271000,China;School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China)
出处
《合成橡胶工业》
CAS
北大核心
2022年第4期320-325,共6页
China Synthetic Rubber Industry
基金
天津市交委科技计划项目(2021-23)
天津市自然科学基金资助项目(18 JCTPJC 54200)。
关键词
纳米碳酸钙
苯乙烯-丁二烯-苯乙烯嵌段共聚物
复合改性沥青
高低温性能
储存稳定性
nano-calcium carbonate
styrene-butadiene-styrene block copolymer
composite modified asphalt
high and low temperature property
storage stability