温拌沥青结合料高低温性能指标评价研究  

Study on the Evaluation of High and Low Temperature Performance Index of Warm Mix Asphalt Binder

作　　者：魏建国[1,2] 梁钰熹 黄美燕 周育名 彭竹仪 WEI Jianguo;LIANG Yuxi;HUANG Meiyan;ZHOU Yuming;PENG Zhuyi(School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Road Structure and Material of Ministry of Transport(Changsha),Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学交通运输工程学院,长沙410114 [2]长沙理工大学道路结构与材料交通行业重点实验室,长沙410114

出　　处：《森林工程》2025年第2期417-429,共13页Forest Engineering

基　　金：国家自然青年科学基金项目(52108396);长沙理工大学道路结构与材料交通行业重点实验室开放基金资助项目(kfj210301)。

摘　　要：针对现有指标的局限性,为更好地评价温拌沥青结合料的高低温性能,选取不同掺量的Sasobit温拌剂和Evotherm 3G温拌剂,并将其掺入70#基质沥青和SBS(苯乙烯-丁二烯-苯乙烯嵌段共聚物)改性沥青中,制备改性沥青。通过动态剪切流变(Dynamic Shear Rheological,DSR)试验得到复数剪切模量(G*)和相位角(δ)参数,并进行相关分析。同时,采用车辙因子(G*/sinδ)、改进型车辙因子(G*(/sinδ)^(9))指标和临界温度(TG*/sinδ)、改进型临界温度(T_(G*/(sinδ)^(9)))指标,对改性沥青的高温性能进行全面评价分析。在低温弯曲流变(Bending Beam Rheometer,BBR)试验中,得到蠕变劲度模量(S)、蠕变速率(m)参数,并对其进行分析,同时建立k指标(蠕变劲度模量与蠕变速率之比),引入蠕变柔量(J(t))指标对改性沥青的低温性能进行评价。试验结果及数据分析表明,相较于G*/sinδ,采用G*(/sinδ)^(9)能够更准确地评估温拌沥青的高温性能,而T_(G*/(sinδ)^(9))适合SBS温拌沥青高温性能评价,对于70#基质沥青而言两者之间无明显差异。另外,k指标可以区分基质沥青和改性沥青低温性能差异,而J(t)指标能够很好地反映温拌沥青低温蠕变性能。最后,利用层次分析法(AHP)对高低温指标进行权重分析,得出权重最大的指标为T_(G*/(sinδ)^(9))和J(t),在评估温拌沥青的高温性能指标时建议采用T_(G*/(sinδ)^(9))指标,在评估温拌沥青低温性能时采用J(t)指标。In view of the limitations of existing indicators,in order to better evaluate the high and low temperature performance of warm mix asphalt binder,different amounts of Sasobit and Evotherm 3G warm mix agent were selected to be mixed with 70#matrix asphalt and SBS modified asphalt to prepare modified asphalt.Two parameters of complex shear modulus G*and phase angleδwere obtained and analyzed by dynamic shear rheological(DSR)test.The rutting factor G*/sinδ,improved rutting factor G*(/sinδ)^(9) index and critical temperatureTG*/sinδ,improved critical temperatureTG*/(sinδ)^(9) index were used to comprehensively evaluate and analyze the high temperature performance of modified asphalt.Two parameters of creep stiffness modulus S and creep rate m were obtained and analyzed by low temperature bending rheological(BBR)test.The k index was established and the creep compliance J(t)index was introduced to evaluate the low temperature performance of modified asphalt.The test results and data analysis showed that:G*(/sinδ)^(9) was more accurate than G*/sinδin evaluating the high temperature performance of warm mix asphalt,and TG*/(sinδ)^(9) was suitable for the high temperature performance evaluation of SBS warm mix asphalt,and there was no obvious difference for 70#matrix asphalt.The k index can distinguish the difference of low temperature performance between matrix asphalt and modified asphalt,and the J(t)index can well reflect the low temperature creep performance of warm mix asphalt.Finally,the weight analysis of high and low temperature indexes was carried out by analytic hierarchy process(AHP),and the weight values of TG*/(sinδ)^(9 )and J(t)were the largest.It was suggested that TG*/(sinδ)^(9) was used to evaluate the high temperature performance of warm mix asphalt,and J(t)was used to evaluate the low temperature performance of warm mix asphalt.

关 键 词：温拌沥青 温拌剂 高温性能 低温性能 评价指标 

分 类 号：U414[交通运输工程—道路与铁道工程]