玻璃纤维复材筋在高温氯盐环境下拉伸力学性能试验研究

EXPERIMENTAL RESEARCH ON TENSILE MECHANICAL PROPERTIES OF GFRP BARS IN HIGH-TEMPERATURE CHLORIDE ENVIRONMENT

玻璃纤维增强聚合物（Glass Fiber Reinforced Polymer,简称GFRP）筋作为一种替代钢筋的新型工程材料已在混凝土结构中开始使用,对高温氯盐溶液中两种基体树脂的GFRP筋在90 d浸泡周期内的腐蚀情况、破坏机理及拉伸力学性能指标的变化规律进行研究。试验结果表明,浸泡前后GFRP筋外观并无太明显的变化,质量变化均在2%之内,说明高温氯盐溶液对GFRP筋的腐蚀不大。两种基体材料GFRP筋的典型破坏形式大致相同,均为丝束状炸开的脆性破坏。在90 d的浸泡周期下,两种基体材料GFRP筋的拉伸强度变化略有不同,但强度衰减均在15%以内,且浸泡前后筋材的拉伸强度值仍可满足相关标准的要求;而弹性模量变化规律相似,高温氯盐溶液对其影响不大,模量衰减均在2%以内,且浸泡前后筋材的弹性模量值仍可满足相关标准的要求。由此可知,氯盐溶液对GFRP筋的拉伸力学性能影响不大,GFRP筋在氯盐环境的工程应用中具有良好的耐久性能。

Glass Fiber Reinforced Polymer（GFRP） bars is a new type of engineering material which has been used as an alternative steel bar in concrete structure. The paper studied the corrosion situation,failure mechanism,and other tensile mechanical properties of GFRP bars of two matrix resin during 90 days immersion period in hightemperature chloride salt solution. The results showed that before and after immersion,the appearance of GFRP bars was not changed obviously,and the change of weight was also within 2%,indicating that the corrosion of GFRP bars in high temperature chloride salt solution was not serious. The typical failure modes of GFRP bars of two kinds of base materials were almost the same,which were both brittle failure of wire bundle explosion; the tensile strength of GFRP bars of the two kinds of substrates changed slightly with the immersing period of 90 days. However,the attenuation of tensile strength was less than 15%,and the tensile strength values of all the materials were still comply with the standards requirements. The elastic modulus were similar so the high-temperature chloride salt solution had little influence on them. The attenuation of elastic modulus was controlled within 2%,and the elastic modulus of all the immersed bars still could comply with the standards requirements. The results showed that the chloride salt solution had little effect on the tensile properties of GFRP bars,and GFRP bars had a good durability properties in the engineering application of chloride salt environment.