摘要
为了研究热氧老化作用对SDYK表面活性剂型温拌胶粉改性沥青胶浆(SWCRM)和EM降黏剂型温拌胶粉改性沥青胶浆(EWCRM)低温流变特性的影响,对热氧老化后的SWCRM、EWCRM以及热拌胶粉改性沥青胶浆(HCRM)进行弯曲梁流变(BBR)试验.以劲度模量(S)与蠕变速率敏感指数(m)的比值S/m及基于Burgers模型的松弛时间(λ)和低温综合柔量参数(J_(c))为指标,分析老化作用对3种沥青胶浆低温流变特性的影响.结果表明:3种沥青胶浆热氧老化后的低温流变性能均减弱;采用Burgers模型研究沥青胶浆的低温流变性能是合理的;J_(c)能很好地描述沥青胶浆的低温流变性能;在-18℃时,EWCRM的S/m值和J_(c)值相较于HCRM分别下降了12.72%、8.58%,SWCRM的S/m值和J_(c)值相较于HCRM分别下降了30.09%、20.71%,说明温拌剂的加入会改善沥青胶浆的低温流变性能,且SDYK的改善效果优于EM.
In order to study the effect of thermo-oxidative aging on the low temperature rheological properties of SDYK surfactant warm mix crumb rubber modified asphalt mortar(SWCRM)and EM viscosity reducer warm mix crumb rubber modified asphalt mortar(EWCRM),the bending beam rheological(BBR)test was carried out on SWCRM,EWCRM and hot mix crumb rubber modified asphalt mortar(HCRM)after thermo-oxidative aging. The effects of aging on the low temperature rheological properties of three kinds of asphalt mortar were analyzed by using S/m(S is stiffness modulus,m is creep rate sensitirity index),relaxation time λ based on Burgers model and low temperature comprehe compliance parameter J_(c)as indexes. The results show that the low-temperature rheological properties of the three asphalt mortars are weakened after thermal oxidative aging. It is reasonable to study the low temperature rheological properties of asphalt mortar by Burgers model. J_(c)can well describe the low-temperature rheological properties of asphalt mortar. At-18 ℃,the S/m value and J_(c)value of EWCRM decreases by 12.72 %and 8.58 % compared with HCRM. And the S/m value and J_(c)value of SWCRM decrease by 30.09% and 20.71 %.It follows that the addition of warm mix agent will improve the low temperature rheological properties of asphalt mortar,and SDYK is better than EM.
作者
杨丽娟
龙念泉
王岚
单鸣宇
YANG Lijuan;LONG Nianquan;WANG Lan;SHAN Mingyu(Key Laboratory of Civil Engineering Structure and Mechanics,Inner Mongolia University of Technology,Hohhot 010051,China;College of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Beijing Urban Road&Bridge Construction Group Co.,Ltd.,Beijing 100124,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2022年第12期1313-1320,共8页
Journal of Building Materials
基金
内蒙古自治区关键技术攻关项目(2019GG031)。
关键词
温拌胶粉改性沥青胶浆
弯曲梁流变试验
BURGERS模型
低温综合柔量参数
warm-mix crumb rubber modified asphalt mortar
bending beam rheological test
Burgers model
low temperature comprehensive compliance parameters
