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蜡的分子量分布和支化对沥青结合料水分敏感性的影响。

Effects of Wax Molecular Weight Distribution and Branching on Moisture Sensitivity of Asphalt Binders.

作者信息

Wang Wenqi, Nili Azuo, Rahman Ali, Chen Xu

机构信息

School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China.

School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China.

出版信息

Materials (Basel). 2022 Jun 14;15(12):4206. doi: 10.3390/ma15124206.

DOI:10.3390/ma15124206
PMID:35744263
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9230054/
Abstract

Wax is an important factor that affects the durability of asphalt binder. In order to understand the molecular weight distribution and branching of wax on the moisture sensitivity of asphalt binder, pure wax-doped asphalt binders are prepared and the performance of model asphalt binders are evaluated by surface free-energy (SFE) and binder bond strength (BBS) tests. In addition, asphaltene is regarded as an additive in this study. The results show that the addition of eicosane, triacontane, squalane and asphaltene can reduce the moisture sensitivity of asphalt, but not necessarily improve its moisture-induced damage resistance. The physical hardening effect of high-wax asphalt and its model asphalt is stronger than that of the corresponding low-wax asphalt and its model asphalt, and its moisture sensitivity is weaker than that of the low-wax asphalt. For all the model asphalts, there is a good correlation between the cohesion work, cohesion POTS (pull-off tensile strength), POTS ratio (the BBS moisture sensitivity index) and ER (the SFE moisture sensitivity index). When using the BBS test to characterize the moisture sensitivity of high-wax asphalt, it is recommended to leave the sample for some time until it is physically hardened and stable.

摘要

蜡是影响沥青结合料耐久性的一个重要因素。为了了解蜡的分子量分布和支化对沥青结合料水敏感性的影响，制备了纯蜡掺杂的沥青结合料，并通过表面自由能（SFE）和结合料粘结强度（BBS）试验对模型沥青结合料的性能进行了评价。此外，本研究中将沥青质视为一种添加剂。结果表明，添加二十烷、三十烷、角鲨烷和沥青质可以降低沥青的水敏感性，但不一定能提高其抗水致损伤能力。高蜡沥青及其模型沥青的物理硬化效应比相应的低蜡沥青及其模型沥青更强，其水敏感性比低蜡沥青弱。对于所有模型沥青，内聚功、内聚POTS（拉拔抗拉强度）、POTS比（BBS水敏感性指数）和ER（SFE水敏感性指数）之间存在良好的相关性。当使用BBS试验来表征高蜡沥青的水敏感性时，建议将样品放置一段时间，直到其物理硬化并稳定。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6d98/9230054/424109351e00/materials-15-04206-g014.jpg
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