摘要
通过(Box-Behnken)响应面法,以硅烷偶联剂改性过的蒙脱土、苯乙烯-丁二烯-苯乙烯(SBS)和高黏剂(HVA)各自的掺量作为影响因素,以沥青3大指标、170℃布氏黏度为评价标准建立模型,确定3种材料在沥青中的最佳掺量。结果表明,5%SBS、9%HVA和8%的改性蒙脱土复配高黏改性沥青性能最好,其针入度、延度、软化点、170℃布氏黏度分别为4.52 mm、42.9 cm、86.1℃、2.371 Pa·s;相比于基质沥青和TPS高黏改性沥青,改性蒙脱土的加入大幅提高了沥青的高温性能与抗车辙能力,沥青黏度有着显著提升;振动峰的消失表明硅烷偶联剂对蒙脱土改性有化学反应。
Using the Box⁃Behnken’s response surface method and taking the dosages of silane⁃coupling⁃agent⁃modified montmorillonite,SBS,and high viscosity agent(HVA)as influence factors for asphalt,a model was established to de⁃termine the optimal dosages of three types of raw materials in the asphalt based on the Brinell viscosity at 170℃as an evaluation criterion.The results indicated that the high⁃viscosity⁃modified asphalt containing 5 wt%SBS,9 wt%HVA,and 8 wt%modified montmorillonite exhibited the best performance,and its penetration,ductility,softening point,and Brinell's viscosity at 170℃were determined to be 4.52 mm,42.9 cm,86.1℃,and 2.371 Pa·s,respectively.Dynamic shear and Brinell's viscosity tests show that,compared to the pristine asphalt and the high⁃viscosity⁃modified asphalt TPS,the addition of modified montmorillonite greatly improved the high⁃temperature performance and rutting resistance of asphalt,resulting in a significant improvement in the viscosity.The functional groups were analyzed by Fourier⁃trans⁃mission infrared spectroscopy.The disappearance of the vibration peaks indicated that the silane coupling agent involved a chemical reaction with montmorillonite in the modification process.
作者
孙吉书
濮夏天
杨凯
靳灿章
SUN Jishu;PU Xiatian;YANG Kai;JIN Canzhang(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;Tianjin Municipal Engineering Design Institute,Tianjin 300051,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2024年第3期18-25,共8页
China Plastics
基金
天津市交通运输科技计划项目(2022-18)
天津市自然科学基金资助项目(18JCTPJC54200)。
关键词
改性沥青
响应面法
硅烷偶联剂
改性蒙脱土
modified bitumen
box⁃behnken
silane coupling agent
modified montmorillonite
