Properties of polymer modified bitumen after rubber-bitumen interaction
Properties of polymer modified bitumen after rubber-bitumen interaction
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DOI：
10.1061/(asce)0899-1561(2002)14:4(344
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发表时间：
2002-07-01
影响因子：
3.2
通讯作者：
Collop, AC
中科院分区：
文献类型：
--
作者：
Airey, GD;Singleton, TM;Collop, AC
本文介绍了苯乙烯-丁二烯-苯乙烯 (SBS) 改性沥青和再生碎胶之间的相互作用对冲击吸收沥青 (IAA) 机械性能影响的实验室研究结果，IAA 是一种可用作运动和安全表面的沥青材料。使用不同的橡胶-沥青比例进行了高温固化测试，以评估橡胶吸收的沥青量。通过这种相互作用引起的沥青成分的变化已经被监测并且与残余沥青的流变特性的变化相关。结果表明，发生了显着的吸收，残余沥青的刚度和粘弹性平衡发生了变化，同时粘聚力也降低了。一个重要的发现是残余 SBS 聚合物改性沥青的聚合性质丧失。这是由于吸收了较轻的粘合剂溶剂化部分后，基础沥青和聚合物之间的相容性下降，导致 SBS 聚合物沉淀。为了评估橡胶-沥青相互作用对 IAA 机械耐久性的影响，开发了磨料磨损测试来模拟扭转脚与表面之间的接触。该测试用于比较实验室制备的经过高温人工老化的样本的机械耐久性（以模拟材料铺设和压实之前的混合和运输阶段）。结果表明，由于橡胶和沥青之间的相互作用，对老化材料的机械耐久性产生不利影响。
This paper describes results from a laboratory investigation into the effects of the interaction between a styrene-butadiene-styrene (SBS) modified bitumen and recycled crumb rubber on the mechanical performance of impact absorbing asphalt (IAA), an asphaltic material that has applications as a sports and safety surface. Curing tests at high temperatures have been undertaken using different rubber-bitumen ratios to assess the amount of bitumen absorbed by the rubber. The changes in bitumen constitution through this interaction have been monitored and related to changes in the rheological characteristics of the residual bitumen. The results show that significant absorption takes place and that the residual bitumen undergoes alterations in terms of its stiffness and viscoelastic balance, together with a reduction in cohesion. A significant finding has been the loss of the polymeric nature of the residual SBS polymer modified bitumen. This has been due to the precipitation of the SBS polymer as the compatibility between the base bitumen and polymer has decreased following the absorption of the lighter, solvating fractions of the binder. To assess the effect of the rubber-bitumen interaction on the mechanical durability of IAA, an abrasive wear test has been developed to simulate the contact between a twisting foot and the surface. This test has been used to compare the mechanical durability of laboratory prepared specimens that have been artificially aged at high temperatures (to simulate the mixing and transportation period before the material is laid and compacted). Results show that there is a detrimental effect on the mechanical durability of the aged material due to the interaction between the rubber and the bitumen.