Characterization of crumb tire rubber lightly pyrolyzed in waste cooking oil and the properties of its modified bitumen
Characterization of crumb tire rubber lightly pyrolyzed in waste cooking oil and the properties of its modified bitumen
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废食用油中轻热解废轮胎橡胶的表征及其改性沥青的性能
DOI：
10.1016/j.conbuildmat.2018.11.044
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发表时间：
2019-01-20
影响因子：
7.4
通讯作者：
Tang, Naipeng
中科院分区：
文献类型：
--
作者：
Dong, Ruikun;Zhao, Mengzhen;Tang, Naipeng
废轮胎橡胶（CTR）是一种最常用的沥青改性剂，用于改善沥青的流变性能。然而，橡胶沥青在使用过程中表现出较差的储存稳定性和施工性，影响了路面的使用性能。研究了废食用油中CTR轻热解产生的废橡胶/油（WRO）作为沥青改性剂的可行性。采用凝胶渗透色谱、傅里叶变换红外光谱和TGA/DSC同步热分析等手段对WRO的化学性质、热行为和反应过程进行了表征。通过TGA/DTG数据计算了WRO的热力学参数，并分析了WRO的热稳定性。分别通过分离试验、常规试验和流变试验对WRO改性沥青和橡胶沥青的储存稳定性、物理性能和流变性能进行了评价。结果表明，轻热解后CTR交联网络结构发生断链和解聚，导致凝胶CTR中橡胶烃含量降低，CTR分子量降低。轻度热解的CTR溶胶中出现天然橡胶，溶胶中含氧官能团的含量增加。WRO的热行为变得复杂，从表观活化能来看，热稳定性增强。与橡胶沥青相比，WRO改性沥青的贮存稳定性、低温塑性和施工性能都有很大改善。但高温下抗车辙和抗变形能力变差。将进行进一步的研究，以提高添加剂的高温性能。(C)2018爱思唯尔有限公司版权所有
Crumb tire rubber (CTR) is one of the most common bitumen modifiers used to improve bitumen rheological properties. However, the rubberized bitumen has shown poor storage stability and workability in the application which affect the service performance of the pavement. This work investigated the feasibility of application of waste rubber/oil (WRO) produced by light pyrolysis of CTR in waste cooking oil as a bitumen modifier. The chemical properties, thermal behaviors and reaction process of WRO were characterized by gel permeation chromatography, Fourier transform infrared spectroscopy and TGA/DSC synchronous thermal analysis. The thermodynamic parameters of WRO were calculated by TGA/DTG data, and the thermal stability of WRO was analyzed. The storage stability, physical and rheological properties of WRO modified bitumen and rubberized bitumen were evaluated by separation test, conventional tests and rheological tests, respectively. Results show that, the chain scission and depolymerization occur in the cross-linked network structure of CTR after light pyrolysis, which result in the reduction of rubber hydrocarbon content in gel CTR and the molecular weight of CTR. Natural rubber appears in the sol of the lightly pyrolyzed CTR, and the content of the oxygen-containing functional groups in the sol increases. The thermal behaviors of WRO become complicated, and thermal stability is enhanced from the apparent active energy. Compared to rubberized bitumen, the storage stability, plasticity at low temperature and workability of WRO modified bitumen are greatly improved. However, the resistance to rutting and deformation at high temperature become worse. Further study will be conducted to enhance the high temperature performance with additional additives. (C) 2018 Elsevier Ltd. All rights reserved.