Performance of glass fiber reinforced polymer bars under elevated temperatures
Performance of glass fiber reinforced polymer bars under elevated temperatures
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DOI：
10.1016/j.compositesb.2012.01.034
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发表时间：
2012-07-01
影响因子：
13.1
通讯作者：
Aqel, Mohammed
中科院分区：
文献类型：
--
作者：
Alsayed, Saleh;Al-Salloum, Yousef;Aqel, Mohammed
本文研究了新型玻璃纤维增强聚合物（GFRP）筋在高温作用不同时间后的剩余拉伸性能。本研究共测试了120个GFRP试件。一半的样品被混凝土覆盖，而另一半是裸露的酒吧。将试样置于三种不同的受控温度（100、200和300 ℃）下三个不同的时间段（1、2和3 h）。测试结果表明，在所有暴露时间和温度之后，几乎没有观察到拉伸模量的损失。记录拉伸强度的损失，与温度水平和暴露时间成比例。钢筋混凝土保护层表现出较高的剩余拉伸强度相比，他们的同行没有涂层。混凝土覆盖层在最低温度水平（100摄氏度）和最短时间内（1小时）更有效。扫描电子显微镜（SEM）技术也被用来研究高温对GFRP筋的降解机制的影响。结果表明，温度的升高影响了玻璃纤维周围的树脂基体，从而影响了纤维与基体之间的粘结。(C)2012爱思唯尔有限公司保留所有权利。
This paper investigates the residual tensile properties of newly developed glass fiber reinforced polymer (GFRP) bars after being subjected to elevated temperatures for different periods. A total of 120 GFRP specimens were tested in this study. Half of the samples were covered with concrete while the other half were bare bars. The specimens were subjected to three different controlled temperatures (100, 200 and 300 degrees C) for three different periods (1, 2, and 3 h). Test results showed chat almost no losses were observed in the tensile modulus after all exposure periods and temperatures. Losses in the tensile strength, proportional to the level of temperature and exposure period, were recorded. The bars with concrete cover showed higher residual tensile strength compared to their counterparts without coating. The concrete cover was more effective at the lowest temperature level (100 degrees C) and at the shortest time period (1 h). Scanning Electronic Microscopy (SEM) technique was also used to investigate the effect of elevated temperature on the degradation mechanism of the GFRP bars. The results showed that increasing the temperature level affected the resin matrix surrounding the glass fibers and consequently affected the bond between the fibers and the matrix. (C) 2012 Elsevier Ltd. All rights reserved.