Effects of Environment-Friendly Rejuvenator on the Rheological Properties and Microstructure of Aged Asphalt

IF 1.6 4区工程技术 Q3 ENGINEERING, CIVIL

Transportation Research Record Pub Date : 2023-10-10 DOI:10.1177/03611981231198835

Qiang Li, Dongxu Liu, Yuting Wen

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引用次数: 0

Abstract

The purpose of this paper is to explore the feasibility of using waste soybean oil and the multi-epoxy compound trimethylolpropane triglycidyl ether (TMPGE) compound as a rejuvenator to recycle aged styrene-butadiene-styrene (SBS)-modified asphalt, and to develop an environment-friendly SBS-modified asphalt rejuvenator (ESMAR) to achieve dual waste reuse. The optimum ratio of each component of ESMAR and the production conditions of the formulation were firstly determined by the orthogonal test method. To evaluate the rejuvenation effect of ESMAR, the physical properties and rheological properties of SBS-modified asphalt before and after rejuvenation were studied. Physical properties test results showed that ESMAR can effectively soften the aged asphalt and decrease its softening point and viscosity, as well as increase its needle penetration. As far as rheological properties are concerned, ESMAR could improve the low-temperature cracking resistance and fatigue resistance of aged SBS-modified asphalt; however, there was a certain reduction in the rutting resistance. The microscopic characteristics of the rejuvenation of ESMAR were analyzed by fluorescence microscopy, infrared spectroscopy, and gel permeation chromatography tests for the aged SBS-modified asphalt before and after rejuvenation, which showed that ESMAR can not only reconstruct the degraded SBS molecules in the aged SBS-modified asphalt, but also has a “dilution” effect on the aged asphalt.

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环保型再生剂对老化沥青流变特性和微观结构的影响

本论文旨在探讨利用废大豆油和多环氧化合物三甲基丙烷三缩水甘油醚(TMPGE)复合物作为再生剂回收老化的丁苯改性沥青的可行性，并研制出环保型SBS改性沥青再生剂(ESMAR)，实现废弃物的双重再利用。首先通过正交试验法确定了ESMAR各组分的最佳配比及配方的生产条件。为了评价ESMAR的再生效果，研究了sbs改性沥青再生前后的物理性能和流变性能。物理性能测试结果表明，ESMAR能有效软化老化沥青，降低老化沥青的软化点和粘度，提高老化沥青的针状穿透性。在流变性能方面，ESMAR可以提高老化sbs改性沥青的低温抗裂性和抗疲劳性;但车辙阻力有一定的降低。通过荧光显微镜、红外光谱和凝胶渗透色谱测试对老化SBS改性沥青再生前后的微观特征进行了分析，结果表明，ESMAR不仅可以重建老化SBS改性沥青中降解的SBS分子，而且对老化沥青具有“稀释”作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Transportation Research Record 工程技术-工程：土木

CiteScore

3.20

自引率

11.80%

发文量

918

审稿时长

4.2 months

期刊介绍： Transportation Research Record: Journal of the Transportation Research Board is one of the most cited and prolific transportation journals in the world, offering unparalleled depth and breadth in the coverage of transportation-related topics. The TRR publishes approximately 70 issues annually of outstanding, peer-reviewed papers presenting research findings in policy, planning, administration, economics and financing, operations, construction, design, maintenance, safety, and more, for all modes of transportation. This site provides electronic access to a full compilation of papers since the 1996 series.