Rheological Properties and Performance Evaluation of Different Types of Composite-Modified Asphalt in Cold Regions

IF 2.9 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS
Coatings Pub Date : 2024-09-13 DOI:10.3390/coatings14091187
Guihua Hu, Xiaowei Chen, Song Zhao, Jian Ouyang
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Abstract

In low-temperature environments, asphalt materials harden easily and become brittle, and the repeated action of traffic load further aggravates the cracking of and damage to the asphalt mixture. In order to explore high-performance asphalt pavement materials that are more suitable for cold climates, this paper selected four modifiers, namely SBS, rubber powder, SBR and TPS. With SBS as the main agent, combined with other modifiers, three types of base asphalts with grades of 70#, 90# and 110# were compositely modified to prepare 12 different combinations of composite-modified asphalt samples. The optimal dosage of the modifier was determined by the basic performance test of asphalt, and the compatibility, interaction energy and mechanical properties of the modifier and base asphalt at different temperatures were analyzed by molecular dynamics simulation. Subsequently, the high- and low-temperature rheological properties of various modified asphalts were systematically evaluated using a dynamic shear rheology test (DSR) and a bending beam rheology test (BBR), and the rheological properties and road performance indicators of each composite-modified asphalt were comprehensively compared so as to select the road materials most suitable for cold areas. The research results show that different grades of base asphalt and modifiers show good compatibility in the range of 160–175 °C. Among them, rubber powder and TPS modifier significantly improve the high-temperature mechanical properties of SBS-modified asphalt, while rubber powder and SBR modifier significantly improve its low-temperature mechanical properties. The DSR and BBR test results further show that SBS/rubber powder composite-modified asphalt exhibits excellent rheological properties under both high- and low-temperature conditions, and is the preferred solution for road materials in cold regions.
寒冷地区不同类型复合改性沥青的流变特性和性能评估
在低温环境下,沥青材料容易硬化变脆,交通荷载的反复作用进一步加剧了沥青混合料的开裂和损坏。为了探索更适合寒冷气候的高性能沥青路面材料,本文选择了四种改性剂,即 SBS、橡胶粉、SBR 和 TPS。以 SBS 为主剂,结合其他改性剂,对 70#、90#、110# 三种等级的基质沥青进行复合改性,制备出 12 种不同组合的复合改性沥青样品。通过沥青基本性能试验确定了改性剂的最佳用量,并通过分子动力学模拟分析了改性剂与基质沥青在不同温度下的相容性、相互作用能和力学性能。随后,利用动态剪切流变试验(DSR)和弯梁流变试验(BBR)对各种改性沥青的高低温流变性能进行了系统评价,并对各种复合改性沥青的流变性能和路用性能指标进行了综合比较,从而筛选出最适合寒冷地区使用的路用材料。研究结果表明,不同等级的基质沥青和改性剂在 160-175 ℃ 范围内具有良好的相容性。其中,橡胶粉和 TPS 改性剂能显著改善 SBS 改性沥青的高温力学性能,而橡胶粉和 SBR 改性剂则能显著改善其低温力学性能。DSR 和 BBR 试验结果进一步表明,SBS/橡胶粉复合改性沥青在高温和低温条件下均表现出优异的流变性能,是寒冷地区道路材料的首选解决方案。
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
Coatings
Coatings Materials Science-Surfaces, Coatings and Films
CiteScore
5.00
自引率
11.80%
发文量
1657
审稿时长
1.4 months
期刊介绍: Coatings is an international, peer-reviewed open access journal of coatings and surface engineering. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided. There are, in addition, unique features of this journal: * manuscripts regarding research proposals and research ideas will be particularly welcomed * electronic files or software regarding the full details of the calculation and experimental procedure - if unable to be published in a normal way - can be deposited as supplementary material
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