Phase structure characterization and compatibilization mechanism of epoxy asphalt modified by thermoplastic elastomer (SBS)

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2022-02-21 DOI:10.1016/j.conbuildmat.2021.126262

Peijun Xu , Zhen Zhu , Yadong Wang , Peiliang Cong , Danggang Li , Jizhuang Hui , Min Ye

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引用次数: 29

Abstract

Epoxy resin is widely used in thermosetting polymer modified asphalt. However, the delamination and segregation will occur owing to the poor compatibility between epoxy resin and asphalt. The rigid molecular structure of epoxy resin also leads to insufficient toughness of epoxy asphalt (EA) at low temperature. In order to solve these problems of EA, styrene butadiene styrene block copolymer (SBS) is used to prepare modified epoxy asphalt (SBS-EA). The phase separation microstructure, rheological properties, mechanical properties and compatibilization mechanism of SBS-EAs are investigated. The initial viscosity of EA is increased by introducing SBS, but it still satisfies the requirement of pavement. The results of fluorescence microscopy and micro-computed tomography reveal that the compatibility of EA can be significantly improved by 3 wt% SBS. The average particle size of dispersed phase asphalt can be reduced with the content of SBS. Micro-infrared and gel permeation chromatography quantitative analysis turn out that SBS will migrate from the base asphalt to epoxy resin crosslinking network. The tensile strength, elongation at break and toughness of 3%SBS-EA are 12%, 67% and 78% higher than those of EA due to the good phase separation structure. Furthermore, the dispersed asphalt phase size is closely correlated with the mechanical properties of SBS-EA.

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热塑性弹性体SBS改性环氧沥青的相结构表征及增容机理

环氧树脂广泛应用于热固性聚合物改性沥青中。但由于环氧树脂与沥青的相容性差，会产生分层和偏析。环氧树脂的刚性分子结构也导致环氧沥青在低温下韧性不足。为解决环氧改性沥青存在的问题，采用丁苯嵌段共聚物(SBS)制备改性环氧沥青(SBS-EA)。研究了SBS-EAs的相分离微观结构、流变性能、力学性能及增容机理。引入SBS后，EA的初始粘度有所提高，但仍能满足路面要求。荧光显微镜和显微计算机断层扫描结果显示，3 wt%的SBS可显著改善EA的相容性。SBS的加入可以减小分散相沥青的平均粒径。微红外和凝胶渗透色谱定量分析表明SBS会从基层沥青向环氧树脂交联网络迁移。由于良好的相分离结构，3%SBS-EA的拉伸强度、断裂伸长率和韧性分别比EA高12%、67%和78%。此外，分散沥青相尺寸与SBS-EA的力学性能密切相关。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.