混凝土碱环境中GFRP筋耐久性能试验研究

复合材料科学与工程 ›› 2015, Vol. 0 ›› Issue (8): 75-79.

混凝土碱环境中GFRP筋耐久性能试验研究

代力¹, 何雄君^1*, 杨文瑞¹, 何有为²

1.武汉理工大学交通学院,湖北武汉 430063;
2.湖北兴达路桥股份有限公司,湖北咸宁 437100

收稿日期:2015-03-15 出版日期:2015-08-28 发布日期:2021-09-14
通讯作者: 何雄君(1965-),男,教授,博士生导师,hxjwhut@163.com。
作者简介:代力(1987-),男,博士生,研究方向为FRP材料耐久性。
基金资助:
国家自然科学基金项目资助(51178361)

EXPERIMENTAL STUDY ON THE DURABILITY OF GFRP BARS EMBEDDED IN ACTUAL CONCRETE ENVIRONMENT

DAI Li¹, HE Xiong-jun^1*, YANG Wen-rui¹, HE You-wei²

1. School of Transportation, Wuhan University of Technology, Wuhan 430063, China;
2. Hubei Xingda Road & Bridge Limited Company, Xianning 437100, China

Received:2015-03-15 Online:2015-08-28 Published:2021-09-14

摘要/Abstract

摘要： 针对玻璃纤维增强聚合物(GFRP)筋在混凝土环境中的抗拉性能进行了试验研究,通过分析侵蚀前后试件的极限抗拉强度和弹性模量等力学性能参数,研究了两种温度下碱溶液和自来水浸泡混凝土环境中GFRP筋的抗拉强度退化规律。试验结果表明,在20℃、40℃自来水环境下浸泡90d后,GFRP筋抗拉强度与对照试件相比分别下降了8.8%和12.2%,而在相同温度的碱溶液中其抗拉强度衰减量可分别达到17.5%和22.1%;随着龄期的增加,抗拉强度减小的趋势逐渐减缓;通过将GFRP筋在混凝土环境下浸泡和直接浸泡在碱溶液中抗拉强度的试验数据对比分析发现,GFRP筋在模拟碱环境中的抗拉强度退化速率约为实际混凝土环境中的2.5~3倍。

关键词: 混凝土环境, GFRP筋, 抗拉强度, 碱性环境

Abstract: An experimental study on GFRP bars embedded in concrete environment was conducted to investigate their tensile strengths. The degradation mechanism of GFRP bars exposed to tap water and alkaline solution at different temperature was studied by analyzing the ultimate tensile strength, elastic modulus of the specimen. The results showed that after being exposed to tap water environment for 90 day at 20 and 40℃,tensile strength of GFRP bar decreased by 8.8%, 12.2%, respectively, but the retention can reach to 17.5%, 22.1%, respectively, in the alkaline solution at the same temperature. With the increase of exposure time, the decrease of tensile strength gradually slows down. Through comparing the specimens embedded in concrete environment with specimen directly immersed in alkaline solution, we can find out that the tensile strength degradation rate of GFRP bar under simulated alkaline solution is about 2.5~3 times of the actual concrete environment.

Key words: concrete environment, GFRP bar, tensile strength, alkaline environment

中图分类号:

TB332
TU528

代力, 何雄君, 杨文瑞, 何有为. 混凝土碱环境中GFRP筋耐久性能试验研究[J]. 复合材料科学与工程, 2015, 0(8): 75-79.

DAI Li, HE Xiong-jun, YANG Wen-rui, HE You-wei. EXPERIMENTAL STUDY ON THE DURABILITY OF GFRP BARS EMBEDDED IN ACTUAL CONCRETE ENVIRONMENT[J]. COMPOSITES SCIENCE AND ENGINEERING, 2015, 0(8): 75-79.

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