ABSTRACT

By referring to the successful application of a cold-resistant plasticizer in the plastic industry, dioctyl adipate (DOA) plasticizer was selected to improve the low-temperature performance of asphalt. Dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests were conducted to analyse the high and low temperature performance of plasticizer-modified asphalt binder. The residual creep rate ratio was put forward to evaluate the improvement effect of the anti-aging performance of asphalt binder. The rheological characteristics analysis shows that DOA could increase the viscous components in asphalt binder. However, with the increase of plasticizer content to 3.0%, the creep rate increased by 35% and the creep stiffness decreased by 39% at −24°C. The low temperature performance of DOA modified asphalt binder was improved by 30%. The residual creep rate ratio of the plasticizer-modified asphalt binder was more than 15% higher than base asphalt at the same temperature and softening point increment was 22.5% lower than base asphalt which means that the anti-aging performance was improved. Comprehensive analysis of the high and low temperature performance of DOA modified asphalt shows that the optimum content is 3.0%. Fourier-Transform Infrared Spectroscopy (FT-IR) indicates that the plasticizer and asphalt binder mainly undergo a physical blending reaction.

摘要

通过参考耐寒增塑剂在塑料工业中的成功应用，选择了己二酸二辛酯（DOA）增塑剂来改善沥青的低温性能。进行了动态剪切流变仪（DSR）和弯曲梁流变仪（BBR）的测试，以分析增塑剂改性沥青粘合剂的高温和低温性能。提出了残余蠕变率比，以评价沥青粘结剂抗老化性能的改善效果。流变特性分析表明，DOA可以增加沥青结合料中的粘性成分。但是，随着增塑剂含量增加到3.0％，在-24°C下蠕变速率增加了35％，蠕变刚度降低了39％。DOA改性沥青粘合剂的低温性能提高了30％。在相同温度下，增塑剂改性沥青粘合剂的残余蠕变率比基础沥青高15％以上，软化点增量比基础沥青低22.5％，这意味着抗老化性能得到了改善。对DOA改性沥青的高低温性能的综合分析表明，最佳含量为3.0％。傅立叶变换红外光谱（FT-IR）表明，增塑剂和沥青粘合剂主要经历物理共混反应。对DOA改性沥青的高低温性能的综合分析表明，最佳含量为3.0％。傅立叶变换红外光谱（FT-IR）表明，增塑剂和沥青粘合剂主要经历物理共混反应。对DOA改性沥青的高低温性能的综合分析表明，最佳含量为3.0％。傅立叶变换红外光谱（FT-IR）表明，增塑剂和沥青粘合剂主要经历物理共混反应。