摘要
为探究老化作用下橡胶改性沥青(AER)及其复合改性沥青(AER/SBS)的低温流变性能,借助常规性能、低温弯曲试验和Burgers模型,研究了在不同老化状态、不同橡胶粉掺量下AER改性沥青及其复合改性沥青的低温流变特性,同时借助红外光谱(FTIR)方法定量分析老化对AER改性沥青官能团的影响,并将其官能团指数和低温指标进行相关性分析.研究结果表明:在不同老化状态下AER、SBS均可提高沥青低温性能,且短期老化下AER/SBS复合改性沥青的低温性能优于AER改性沥青,长期老化则反之;AER、SBS改性剂均可改善沥青的劲度模量,且AER对沥青劲度模量的影响程度更显著,同时低温指标(劲度模量S、蠕变速率m、劲度模量与蠕变速率之比S/m)与黏弹性指标(松弛时间λ、耗散能比a具有紧密的联系);AER改性沥青的低温性能与脂肪指数IA和脂肪长链指数IAL有较高的相关性,且IA越大其低温性能越好,IAL则反之.
In order to explore the low temperature rheological properties of rubber modified asphalt(namely the activated twin-screw extruded rubber(AER)powder modified asphalt)and AER/SBS(styrene-butadiene styrene)composite modified asphalt under aging.The low temperature rheological properties of AER modified asphalt and its composite modified asphalt under different aging conditions and different rubber powder content were studied using conventional performance,low temperature bending test and Burgers model.At the same time,the influence of aging on the functional group of AER rubber modified asphalt was quantitatively analyzed by infrared FTIR method,and the correlation between its functional group index and various low temperature indicators was analyzed.The results show that AER and SBS can improve the low temperature performance of asphalt under different aging conditions;the low temperature performance of AER/SBS composite modified asphalt is better than AER modified asphalt under short-term aging,while the opposite is true under long-term aging.Both AER and SBS modifiers can improve the stiffness modulus of asphalt and AER has a greater impact on asphalt stiffness modulus,while low temperature grading indexes(i.e.,stiffness modulus S,creep rate m,and the ratio S/m)and viscoelasticity indexes(i.e.,relaxation timeλ)and dissipation-storage energy ratio a has a strong correlation.The low temperature performance of AER modified asphalt has a high correlation with the fat index IA and the fat long chain index IAL:the greater the aliphatic index,the better the low temperature performance,while the aliphatic fat long chain index is the opposite.
作者
于江
赵群
叶奋
宋卿卿
YU Jiang;ZHAO Qun;YE Fen;SONG Qingqing(Civil Construction College of Xinjiang University,Urumqi 830047,China;Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,Shanghai 201804,China)
出处
《西南交通大学学报》
EI
CSCD
北大核心
2021年第1期108-115,共8页
Journal of Southwest Jiaotong University
基金
国家自然科学基金(51168044,51668060,51568064)。
