TLA/SBR复合改性沥青性能试验研究

为了改善特立尼达湖沥青(简称TLA)改性沥青低温抗裂性,提出用丁苯橡胶(SBR)对其改性,期望综合两种改性剂的优点。对不同掺量的TLA与SBR复合改性沥青进行了常规试验(针入度、软化点、延度、旋转粘度)、DSR试验、BBR试验,并测试了短期老化与长期老化后的残留针入度比,研究TLA与SBR掺量对高、低温性以及抗老化性能的影响。研究结果表明:①掺入SBR与TLA均能改善沥青的高温抗变形能力和感温性,对比TLA,SBR对沥青高温性能的改善效果更显著;②TLA对复合改性沥青的低温性能有不利影响,但掺入SBR可以抵消这种不利影响;③掺加5%~20%的TLA能改善复合改性沥青的抗老化性能,在此TLA掺量下,SBR也能改善沥青的抗老化性能。④综合高、低温性能和老化性能的表现,最佳掺量为20%的TLA+3%的SBR。

Study on Properties of TLA and SBR Composite Modified Asphalt

In order to improve the low temperature performance of Trinidad Lake Asphalt(TLA)modified asphalt,styrene butadiene rubber(SBR)was used to modify it,to fuse the advantages of the two modifiers.In this paper,the conventional tests(penetration,softening point,ductility,rotational viscosity),DSR test and BBR test of TLA and SBR composite modified asphalt with different dosages were carried out,and the residual penetration ratio after short-term and long-term aging was tested to study the effects of the amount of TLA and SBR on high,low temperature and anti-aging properties.The results show that(1)SBR and TLA can improve the high-temperature deformation resistance and temperature sensitivity of asphalt,and SBR can improve the high-temperature performance of asphalt more significantly than TLA;(2)TLA has an adverse effect on the low temperature performance of the composite modified asphalt,but SBR can counteract the adverse effect;(3)Adding 5%~20%TLA can improve the anti-aging properties of the composite modified asphalt,under the dosage of TLA,SBR can also improve the aging resistance of asphalt.(4)The best content is 20%TLA+3%SBR.