Influence of the chemical composition and the morphology of crumb rubbers on the rheological and self-healing properties of bitumen
Influence of the chemical composition and the morphology of crumb rubbers on the rheological and self-healing properties of bitumen
复制标题
胶粉化学成分和形态对沥青流变性能和自修复性能的影响
DOI：
10.1016/j.conbuildmat.2019.03.205
复制
发表时间：
2019-06-20
影响因子：
7.4
通讯作者：
Gu, Xin
中科院分区：
文献类型：
--
作者：
Liu, Gang;Liang, Yangshi;Gu, Xin
用三种典型废旧轮胎胶粉(CRS)对两种基质沥青进行改性。用热重-质谱仪(TG-MS)和扫描电子显微镜(SEM)分别对CRS的化学组成和形貌进行了表征。用Brookfield粘度计、弯曲梁流变仪(BBR)和动态剪切流变仪(DSR)研究了CR改性沥青(CRM粘结剂)的流变性和自愈性。结果表明，含苯环的丁苯橡胶与基质沥青的相容性较好，对其粘度和动态流变性能的影响较大。化学结构简单的天然橡胶(异戊二烯)可以保留更多的柔韧性，其CRM粘结剂具有更好的低温蠕变性能。丁基橡胶颗粒形态对基质沥青性能变化的贡献较小。由于胶粉(尤其是丁苯橡胶)在疲劳过程中的再膨胀作用，提高了粘结剂的自愈性能，提高了疲劳寿命的恢复率和初始复模。研究结果将有助于更好地了解CR与沥青的相互作用机理，并指导工业生产性能优良的CRM粘结剂。(C)2019爱思唯尔有限公司。保留所有权利。
Three crumb rubbers (CRs) from typical waste tires were used to modify two base bitumens. The chemical compositions and the morphologies of CRs were characterized by the thermogravimetry-mass spectrometer (TG-MS) and the scanning electron microscope (SEM), respectively. The rheological and self-healing properties of CR modified bitumen (CRM binder) were investigated by the Brookfield viscometer, the bending beam rheometer (BBR) and the dynamic shear rheometer (DSR). The results indicated that the styrene butadiene rubber with the benzene ring had a better compatibility with base bitumen and can influence its viscosity and dynamic rheological properties more. The natural rubber with a simpler chemical structure (isoprene) can reserve more flexibility and its CRM binder had a better low-temperature creep performance. The butyl rubber with the granular morphology contributed less to the property change of base bitumen. Due to the re-swelling effect of crumb rubber (especially for the styrene butadiene rubber) during the fatigue, the self-healing properties of the base binder got improved with respect to the recovery of fatigue life and initial complex modulus. The results will helpful to better understand the interaction mechanism between CR and bitumen, as well as to guide the production of the CRM binder with excellent properties in industry. (C) 2019 Elsevier Ltd. All rights reserved.