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Thermal aging behaviors of the waste tire rubber used in bitumen modification
Progress in Rubber, Plastics and Recycling Technology ( IF 2.6 ) Pub Date : 2021-09-03 , DOI: 10.1177/14777606211038951
Haopeng Wang 1, 2 , Xueyan Liu 1 , Aikaterini Varveri 1 , Hongzhi Zhang 3, 4 , Sandra Erkens 1 , Athanasios Skarpas 1, 5 , Zhen Leng 2
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Considering the application scenarios of rubber granules from waste tires in the bitumen modification process (wet or dry process), both aerobic and anaerobic aging of rubber may occur. The current study aims to investigate the thermal aging behavior of waste tire rubber samples using nanoindentation and environment scanning electron microscopy (ESEM) tests. Both aerobic and anaerobic aging tests with different durations were conducted on rubber samples. The complex moduli of aged rubber samples were measured by nanoindentation tests. The surface morphology and elemental composition of aged samples were obtained by ESEM tests together with the energy dispersive X-ray analysis. Results have shown that for both aerobic and anaerobic aging, the equilibrium modulus derived from the complex modulus curve first increases and then decreases with aging time. However, the time needed for the aerobically aged sample to reach the maximum equilibrium modulus is shorter than the anaerobic case. Aging results in crack propagation and an increase of sulfur content on the rubber surface until it reaches the peak. The degree of crosslinking reflected by sulfur content for anaerobic aging is higher than aerobic aging. The morphological change and elemental change of rubber correlate well with the change of mechanical properties. The aging of rubber from the waste truck tire at 180°C can generally be separated into two stages: crosslinking dominant stage and chain scission dominant stage.



中文翻译:

用于沥青改性的废旧轮胎橡胶的热老化行为

考虑到废轮胎橡胶颗粒在沥青改性过程(湿法或干法)中的应用场景,橡胶可能会出现好氧和厌氧老化。目前的研究旨在使用纳米压痕和环境扫描电子显微镜 (ESEM) 测试研究废轮胎橡胶样品的热老化行为。对橡胶样品进行了不同持续时间的有氧和无氧老化试验。老化橡胶样品的复杂模量通过纳米压痕测试测量。通过 ESEM 测试和能量色散 X 射线分析获得老化样品的表面形貌和元素组成。结果表明,对于有氧和无氧老化,由复数模量曲线推导出的平衡模量随老化时间先增加后减小。然而,有氧老化样品达到最大平衡模量所需的时间比厌氧情况短。老化导致裂纹扩展和橡胶表面硫含量增加,直至达到峰值。厌氧时效用硫含量反映的交联度高于好氧时效。橡胶的形态变化和元素变化与力学性能的变化有很好的相关性。废旧轮胎橡胶在180℃下的老化一般可分为两个阶段:交联主导阶段和断链主导阶段。需氧老化样品达到最大平衡模量所需的时间比厌氧情况短。老化导致裂纹扩展和橡胶表面硫含量增加,直至达到峰值。厌氧时效用硫含量反映的交联度高于好氧时效。橡胶的形态变化和元素变化与力学性能的变化有很好的相关性。废旧轮胎橡胶在180℃下的老化一般可分为两个阶段:交联主导阶段和断链主导阶段。需氧老化样品达到最大平衡模量所需的时间比厌氧情况短。老化导致裂纹扩展和橡胶表面硫含量增加,直至达到峰值。厌氧时效用硫含量反映的交联度高于好氧时效。橡胶的形态变化和元素变化与力学性能的变化有很好的相关性。废旧轮胎橡胶在180℃下的老化一般可分为两个阶段:交联主导阶段和断链主导阶段。厌氧时效用硫含量反映的交联度高于好氧时效。橡胶的形态变化和元素变化与力学性能的变化有很好的相关性。废旧轮胎橡胶在180℃下的老化一般可分为两个阶段:交联主导阶段和断链主导阶段。厌氧时效用硫含量反映的交联度高于好氧时效。橡胶的形态变化和元素变化与力学性能的变化有很好的相关性。废旧轮胎橡胶在180℃下的老化一般可分为两个阶段:交联主导阶段和断链主导阶段。

更新日期:2021-09-03
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