Durability of GFRP Reinforced Concrete in Field Structures

A. Mufti, M. Onofrei, B. Benmokrane, N. Banthia, M. Boulfiza, J. Newhook, B. Bakht, G. Tadros, P. Brett
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引用次数: 49

Abstract

Synopsis: Recently, ISIS Canada studied the durability of GFRP in concrete in several field structures across Canada. The objective of the study was to provide the engineering community with the results of the performance of GFRP materials that have been exposed to the concrete environment in built structures. Cores of GFRP-reinforced concrete were removed from five field structures. Analytical methods, namely optical microscopy, scanning electron microscopy and energy dispersive x-ray, differential scanning calorimetry and infrared spectroscopy, were used to determine the composition of GFRP after being subjected to the alkaline environment of concrete for five to eight years. Three research teams from four Canadian universities performed microanalyses of the GFRP and surrounding concrete independently. Results indicate that no deterioration of GFRP took place in any of the field structures. No chemical degradation processes occurred within the GFRP due to the alkalinity of the concrete. The overall conclusion of the study is that GFRP is durable in concrete. Also, it was concluded that the CHBDC was conservative in its first edition by not permitting GFRP as primary reinforcement. As a result of the study, the second edition of the CHBDC, currently in the final stages of approval, permits the use of GFRP as primary reinforcement.
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GFRP增强混凝土在现场结构中的耐久性
摘要:最近,ISIS Canada在加拿大的几个现场结构中研究了GFRP在混凝土中的耐久性。该研究的目的是向工程界提供GFRP材料在建筑结构中暴露于混凝土环境中的性能结果。从五个现场结构中移除gfrp增强混凝土核心。采用光学显微镜、扫描电镜、能量色散x射线、差示扫描量热法、红外光谱等分析方法,测定GFRP在混凝土碱性环境下经受5 ~ 8年后的成分。来自加拿大四所大学的三个研究小组分别对玻璃钢和周围混凝土进行了微观分析。结果表明,所有现场结构均未发生玻璃钢劣化。由于混凝土的碱性,GFRP内部没有发生化学降解过程。研究的总体结论是GFRP在混凝土中的耐久性。此外,CHBDC在其第一版中不允许GFRP作为主要加固是保守的。研究结果表明,CHBDC第二版(目前正处于批准的最后阶段)允许使用GFRP作为主要加固材料。
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