Effects of rejuvenators and aging conditions on the properties of blended bitumen and the cracking behavior of hot asphalt mixtures with a high RAP content

IF 2.5 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications Pub Date : 2024-03-18 DOI:10.1177/14644207241236901

Lan Ngoc Nguyen, Van Quyet Truong, Dong Van Dao, May Huu Nguyen, Trung Tran

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引用次数: 0

Abstract

The utilization of Reclaimed Asphalt Pavement (RAP) in asphalt pavement has obtained global popularity because of its cost-efficiency, technical advantages, and positive environmental influence. However, incorporating RAP requires careful consideration of cracking resistance because of the existence of age hardening of bitumen in RAP. For the mixtures containing high RAP contents, rejuvenators are often applied to enhance the performances of aged bitumen and the cracking of mixtures. This research aims to evaluate the effects of different rejuvenators on the rheological properties of bitumen and the cracking resistance of the mixture under short and long-term aging conditions. To achieve this goal, three rejuvenators - namely, RA1 (petroleum-based), RA2 (waste vegetable oil-based), and RA3 (modified soybean oil-based) were evaluated at contents of 0%, 4%, 12%, and 20%, respectively. The dynamic shear rheometer (DSR) test results show that, under unaged and rolling thin-film oven (RTFO) aging conditions, blended bitumen with RA1 and RA3 have higher G*/sinδ than RA2. Conversely, under pressure aging vessel (PAV) aging conditions, blended bitumen with RA1 and RA3 has lower G*sinδ than that with RA2. Regarding the cracking resistance, the indirect tension asphalt cracking test results show that, under short-term oven aging (STOA) conditions, the mixture using RA2 and RA3 has a higher cracking tolerance index (CTIndex) than the one with RA1. However, under long-term oven aging (LTOA) conditions, the mixture using RA1 has the highest CTIndex value. In addition, the high correlations between G*sinδ with CTIndex and post-peak slope (|m75|) and between the CTIndex and |m75| are observed.

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再生剂和老化条件对混合沥青性能和高 RAP 含量热沥青混合物开裂行为的影响

在沥青路面中使用再生沥青路面（RAP）因其成本效益、技术优势和对环境的积极影响而受到全球的欢迎。然而，由于再生沥青路面中的沥青存在龄期硬化，因此使用再生沥青路面需要仔细考虑抗裂性。对于 RAP 含量较高的混合料，通常会使用再生剂来提高老化沥青的性能和混合料的抗裂性。本研究旨在评估在短期和长期老化条件下，不同再生剂对沥青流变特性和混合料抗裂性的影响。为实现这一目标，研究人员分别以 0%、4%、12% 和 20% 的含量对 RA1（石油基）、RA2（废植物油基）和 RA3（改性大豆油基）这三种回春剂进行了评估。动态剪切流变仪（DSR）测试结果表明，在未老化和轧制薄膜炉（RTFO）老化条件下，RA1 和 RA3 混合沥青的 G*/sinδ 值高于 RA2。相反，在压力老化箱（PAV）老化条件下，含有 RA1 和 RA3 的混合沥青比含有 RA2 的混合沥青具有更低的 G*sinδ。在抗裂性方面，间接拉伸沥青开裂试验结果表明，在短期烘箱老化（STOA）条件下，使用 RA2 和 RA3 的混合料比使用 RA1 的混合料具有更高的抗裂指数（CTIndex）。然而，在长期烘箱老化（LTOA）条件下，使用 RA1 的混合物的 CTIndex 值最高。此外，还观察到 G*sinδ 与 CTIndex 和峰后斜率 (|m75|)之间以及 CTIndex 与 |m75|之间的高度相关性。

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

Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 工程技术-材料科学：综合

CiteScore

4.70

自引率

8.30%

发文量

166

审稿时长

3 months

期刊介绍： The Journal of Materials: Design and Applications covers the usage and design of materials for application in an engineering context. The materials covered include metals, ceramics, and composites, as well as engineering polymers. "The Journal of Materials Design and Applications is dedicated to publishing papers of the highest quality, in a timely fashion, covering a variety of important areas in materials technology. The Journal''s publishers have a wealth of publishing expertise and ensure that authors are given exemplary service. Every attention is given to publishing the papers as quickly as possible. The Journal has an excellent international reputation, with a corresponding international Editorial Board from a large number of different materials areas and disciplines advising the Editor." Professor Bill Banks - University of Strathclyde, UK This journal is a member of the Committee on Publication Ethics (COPE).