两种温拌剂对SBS改性沥青胶结料高低温性能的影响研究

通过室内试验,采用软化点试验和动态剪切流变试验对添加Evotherm和Sasobit温拌剂的SBS改性沥青的高温性能进行评价;采用延度试验和弯曲梁流变试验对添加Evotherm和Sasobit温拌剂的SBS改性沥青的低温性能进行评价。试验结果表明：掺加Evotherm和Sasobit两种温拌剂后,SBS改性沥青的软化点最大增幅为9.5%和25.4%、Fail Temperature值最大增幅为9%和20.4%,两种温拌剂使其高温性能得到较大的改善;相比之下,Sasobit温拌剂对SBS改性沥青的高温性能改善更为显著,使其软化点和Fail Temperature值最大增幅为25.4%和20.4%。;但同时Sasobit也使其延度和弯曲流变性能降低,低温抗裂性能变差,Evotherm对其低温性能的不利影响较小。

Effects of Two Warm Mix Agents on High and Low Temperature Performance of SBS Modified Asphalt Binder

Through the indoor experiments,this study evaluates the high and low temperature performance of SBSmodified asphalt binder with Evotherm and Sasobit by softening point test,dynamic shear rheological test,ductili-ty test and bending beam rheological test.Test results indicate that the maximum elevatory amplitude of softeningpoint ofSBS modified asphalt with Evotherm and Sasobit is 9.5% and 25.4%,while Fail Temperature values is 9%and 20.4%,the high temperature performance is greatly improved with Sasobit being more remarkable for thispoint.Meanwhile,Sasobit can also lower its ductility and bending rheological property and its low-temperaturecracking resistance,while Evotherm has less adverse effects on its low-temperature properties.