Anti-Aging potential of sulphur in terminal blend rubberized asphalt binder
Anti-Aging potential of sulphur in terminal blend rubberized asphalt binder
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硫磺在终端共混橡胶沥青中的抗老化潜力
DOI：
10.1016/j.conbuildmat.2020.118858
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发表时间：
2020-07-30
影响因子：
7.4
通讯作者：
Dong, Ruikun
中科院分区：
文献类型：
--
作者：
Tang, Naipeng;Dong, Ruikun
通过将废橡胶粉改性剂（CRM）溶解于沥青中，同时添加SBS聚合物、硫磺交联剂等改性剂，可制备出端混型橡胶沥青结合料。硫对沥青氧化和聚合物降解的影响对于TB橡胶沥青结合料没有很好的记录。从化学和力学角度研究了硫在TB橡胶沥青结合料中的抗老化潜力。利用傅立叶变换红外光谱（FTIR）得到的羰基指数和丁二烯/苯乙烯比，分析了羰基增长和丁二烯还原。采用凝胶渗透色谱法（GPC）测定聚合物的保留指数来检测聚合物分子量的变化。用复模量竖杆G* 竖杆计算硬化指数，用相位角主曲线分析硫的弹性贡献。在本实验室老化研究中，交联剂硫磺对TB橡胶沥青结合料的羰基增长没有明确的正面或负面影响。然而，硫确实有助于减轻时效硬化行为。对于混溶性TB橡胶沥青结合料，0.3%或0.4%的硫可以提高抗聚合物降解性。此外，硫磺可以改善TB橡胶沥青结合料的弹性响应，即使是压力老化容器（PAV）老化的沥青。(C)2020爱思唯尔有限公司保留所有权利。
Terminal blend (TB) rubberized asphalt binder can be produced through the dissolution of crumb rubber modifier (CRM) in asphalt, meanwhile other modifiers, like styrene-butadienestyrene (SBS) polymer and crosslinking agent sulphur are supplemented to enhance the properties of modified asphalt. The effect of sulphur on asphalt oxidation and polymer degradation is not well documented for TB rubberized asphalt binder. This paper investigates anti-aging potential of sulphur in TB rubberized asphalt binder from chemical and mechanical perspective. Carbonyl index and butadiene/styrene ratio, which are derived from fourier transform infrared (FTIR) spectrums, are applied to analyse carbonyl growth and butadiene reduction. Gel permeation chromatography (GPC) based polymer retention index is used to detect the change of polymer molecular weight. The complex modulus vertical bar G*vertical bar is used to calculate hardening index and phase angle master curve is used to analyse the elastic contribution of sulphur. Crosslinking agent sulphur does not have definite positive or negative effect on the carbonyl growth of TB rubberized asphalt binders in this laboratory aging study. However, sulphur does help to alleviate the age hardening behavior. For miscible TB rubberized asphalt binders, 0.3% or 0.4% sulphur can improve the resistance to polymer degradation. In addition, sulphur can improve elastic response of TB rubberized asphalt binder even for pressurized aging vessel (PAV) aged asphalt. (C) 2020 Elsevier Ltd. All rights reserved.