Study on the Curing Process of Epoxy Asphalt

IF 0.8 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Journal of Testing and Evaluation Pub Date : 2012-12-22 DOI:10.1520/JTE20120136

Jianming Wei, Yuzhen Zhang

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引用次数: 35

Abstract

In the present study, the curing process of epoxy asphalt was studied using Fourier transform infrared spectroscopy (FTIR) with attenuated total reflectance, fluorescent microscopy morphology, and surface free energy. FTIR was utilized to track the functional group changes in epoxy resin (part A) and asphalt containing a curing agent (part B) at different curing times. It is proposed that the curing agent (hardener) in the asphalt (part B) is a carboxylic acid. The curing process is the reaction between the carboxyl group and the epoxy group through which the ester carbonyl group is formed, whereby carbonyl acid molecules and epoxy molecules are bound together to form a cross-linked network. The fluorescent microscopy morphology analysis indicates that the cross-linked network did not form at the beginning of the reaction. In the cured epoxy asphalt system, the epoxy resin is the continuous phase, and the asphalt constitutes the dispersed phase. The sessile drop method was employed to measure the static contact angle between asphalt binders and three probe liquids. The surface free energies of the epoxy asphalt at different curing times were determined using the Owens–Wendt method. Contact angle and surface free energy measurements indicate that the polarity of epoxy asphalt was reduced and the dispersion part was increased with the extended curing time.

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环氧沥青固化工艺研究

在本研究中，采用傅里叶变换红外光谱(FTIR)、荧光显微镜形态学和表面自由能对环氧沥青的固化过程进行了研究。利用红外光谱(FTIR)对环氧树脂(A)和含固化剂沥青(B)在不同固化时间下官能团的变化进行了跟踪研究。提出沥青(B部分)中的固化剂(硬化剂)为羧酸。固化过程是羧基和环氧基之间的反应，通过这种反应形成酯羰基，羰基分子和环氧分子结合在一起形成交联网络。荧光显微镜形态分析表明，交联网络在反应开始时未形成。在固化的环氧沥青体系中，环氧树脂为连续相，沥青为分散相。采用固定式液滴法测量了沥青粘结剂与三种探针液体的静态接触角。采用欧文斯-温特法测定了不同固化时间下环氧沥青的表面自由能。接触角和表面自由能测量结果表明，随着固化时间的延长，环氧沥青的极性降低，分散部分增加。

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

Journal of Testing and Evaluation 工程技术-材料科学：表征与测试

CiteScore

2.30

自引率

8.30%

发文量

221

审稿时长

6.7 months

期刊介绍： This journal is published in six issues per year. Some issues, in whole or in part, may be Special Issues focused on a topic of interest to our readers. This flagship ASTM journal is a multi-disciplinary forum for the applied sciences and engineering. Published bimonthly, the Journal of Testing and Evaluation presents new technical information, derived from field and laboratory testing, on the performance, quantitative characterization, and evaluation of materials. Papers present new methods and data along with critical evaluations; report users'' experience with test methods and results of interlaboratory testing and analysis; and stimulate new ideas in the fields of testing and evaluation. Major topic areas are fatigue and fracture, mechanical testing, and fire testing. Also publishes review articles, technical notes, research briefs and commentary.