基于MSCR试验的生物沥青高温性能评价  

High-Temperature Performance Evaluation of Bio-Asphalt on the Basis of MSCR Test

作　　者：高俊锋[1] 汪海年[1] 尤占平[1,2] 陈曦 姜鑫[1] GAO Jun-feng1 ,WANG Hai-nian1, YOU Zhan-ping1,2, CHEN Xi1, JIANG Xin1(1.Road Structure and Materials Key Laboratory for Transportation,Chang’an University,Xi’an 710064,Shaanxi,China; 2.Department of Civil and Environmental Engineering,Michigan Technological University,Houghton 49931,US)

机构地区：[1]长安大学道路结构与材料交通行业重点实验室,陕西西安710064 [2]密歇根理工大学土木工程与环境学院,美国霍顿49931

出　　处：《华南理工大学学报（自然科学版）》2017年第11期24-30,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51378074;51578075);交通运输部应用基础研究项目(2014319812180)~~

摘　　要：通过高温分级试验和多应力蠕变恢复试验,研究了不同生物质重油掺量及温度下生物沥青的PG高温分级、不可恢复蠕变柔量、蠕变恢复率和应力敏感性,对比分析了基于AASHTO MP 19标准的生物沥青高温性能分级,并采用车辙试验验证了生物沥青混合料的高温性能.结果表明:综合等车辙因子临界温度对生物沥青的原样沥青的等级划分效果明显;生物沥青的恢复率较基质沥青和S100沥青大,蠕变柔量较基质沥青和S100沥青小;生物沥青的不可恢复蠕变柔量和蠕变恢复率应力敏感性随生物质重油掺量的变化不呈现明显规律,但应力敏感性随温度的升高而增大;64℃可作为低掺量生物沥青高温分级的基准温度.The PG high-temperature classification,unrecoverable creep compliance,creep recovery rate and stress sensitivity of the bio-asphalt with different bio-oil dosages and temperatures were investigated by a high-temperature classification test and a multiple stress creep recovery test（ MSCR）,and the classification of the high-temperature performance of the bio-asphalt on the basis of the AASHTO MP 19 standard was analyzed. Then,the high-temperature performance of bio-asphalt mixtures was verified by a rutting test. The results show that（ 1） the critical temperature of integrated asphalt rutting factor produces a significant effect on the classification of origin bio-asphalt;（ 2） as compared with the matrix asphalt and S100 asphalt,the bio-asphalt achieves a higher recovery rate but with a smaller creep compliance;（ 3） the unrecoverable creep compliance and the stress sensitivity of the creep recovery rate show no obvious rule with the change of the bio-oil dosage,while the stress sensitivity of the bio-asphalt increases with the rise of temperature; and（ 4） 64 ℃ can be used as the reference temperature for high-temperature classification of low-dosage bio-asphalt.

关 键 词：生物沥青 高温性能 多应力蠕变恢复试验 应力敏感性 

分 类 号：U416.217[交通运输工程—道路与铁道工程]