Effect of ageing on rheological properties of storage-stable SBS/sulfur-modified asphalts
Effect of ageing on rheological properties of storage-stable SBS/sulfur-modified asphalts
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DOI：
10.1016/j.jhazmat.2010.06.061
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发表时间：
2010-10-15
影响因子：
13.6
通讯作者：
Wu, Shaopeng
中科院分区：
文献类型：
--
作者：
Zhang, Feng;Yu, Jianying;Wu, Shaopeng
氧化老化是道路施工过程中不可避免的一个过程，对聚合物改性沥青的性能有很大影响。本文研究了短期和长期氧化老化对苯乙烯-丁二烯-苯乙烯（SBS）改性沥青和储存稳定的SBS/硫磺改性沥青的流变性能、物理性能和形态结构的影响。对老化前后的流变性能和物理性能的分析表明，老化的两个主要影响。老化一方面促进了聚合物的降解，提高了改性沥青的粘性，另一方面改变了沥青的组成，改善了改性沥青的弹性。老化粘结剂的最终性能取决于综合效应。老化后，SBS/硫磺改性沥青的低温蠕变性能较SBS改性沥青有明显的改善。由于SBS/硫磺改性沥青的结构不稳定性，硫磺的加入降低了SBS改性沥青的抗车辙性能。改性粘结剂老化前后的流变性能也强烈依赖于SBS的结构特征。通过光学显微镜观察发现，随着老化时间的延长，SBS与沥青的相容性得到改善，尤其是对于储存稳定的SBS/硫磺改性沥青。(C)2010 Elsevier B. V.保留所有权利。
Oxidative ageing as an inevitable process in practical road paving has a great effect on the properties of polymer-modified asphalts (PMAs). In this article, the effect of short-term and long-term oxidative ageing on the theological, physical properties and the morphology of the styrene-butadiene-styrene (SBS)- and storage-stable SBS/sulfur-modified asphalts was studied, respectively. The analysis on the rheological and physical properties of the PMAs before and after ageing showed the two major effects of ageing. On one hand, ageing prompted the degradation of polymer and increased the viscous behaviour of the modified binders, on the other, ageing changed the asphalt compositions and improved the elastic behaviour of the modified binders. The final performance of the aged binders depended on the combined effect. After ageing, the storage-stable SBS/sulfur-modified asphalts showed an obvious viscous behaviour compare with the SBS-modified asphalts and this led to an improved low-temperature creep property. The rutting resistance of the SBS-modified asphalts declined by the addition of sulfur due to the structural instability of the SBS/sulfur-modified asphalts. The rheological properties of the modified binders before and after ageing also depended strongly on the structural characteristics of SBS. The observation by using optical microscopy showed the compatibility between asphalt and SBS was improved with further ageing, especially for the storage-stable SBS/sulfur-modified asphalts. (C) 2010 Elsevier B.V. All rights reserved.