碱性环境下不同基体材料GFRP筋的拉伸性能试验研究

发布时间：2018-07-03 03:36

本文选题：玻璃纤维增强聚合物筋 + 基体树脂　；参考：《玻璃钢/复合材料》2017年11期

【摘要】：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建筑材料已在混凝土结构中开始使用,研究在模拟混凝土的碱性溶液中,不同基体材料的GFRP筋在90 d浸泡周期内的腐蚀机理、破坏机理及拉伸强度、弹性模量等拉伸力学性能的变化规律。试验结果表明: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;基体材料为不饱和聚酯树脂基的GFRP筋的拉伸强度会不断降低,弹性模量前期稍有增长,后期也不断降低,最终浸泡周期达到90 d时,其拉伸强度和弹性模量的衰减均低于标准的最低要求;基体材料为乙烯基酯树脂的GFRP筋的拉伸强度会不断降低,但衰减速率要低于基体材料为不饱和聚酯树脂的GFRP筋,而弹性模量变化并不明显,最终浸泡周期达到90 d时,抗拉强度和弹性模量均满足标准规定的最低要求。
[Abstract]:Glass Fiber reinforced Polymer ("GFRP") tendons have been used in concrete structures as a new type of building material to replace steel bars. Corrosion mechanism, failure mechanism, tensile strength and elastic modulus of GFRP bars with different substrates during 90 d immersion period. The experimental results show that the typical failure forms of GFRP bars are similar, both of them are brittle failure of filament burst, and the tensile strength of GFRP tendons based on unsaturated polyester resin matrix will decrease continuously, and the tensile strength of GFRP tendons with unsaturated polyester resin matrix will be decreased, and the tensile strength of GFRP tendons with unsaturated polyester resin matrix will be decreased. The elastic modulus increased slightly in the early stage and decreased in the later stage. When the final immersion cycle reached 90 days, the attenuation of tensile strength and elastic modulus was lower than the minimum standard. The tensile strength of GFRP tendons with vinyl ester resin matrix will decrease, but the attenuation rate will be lower than that of GFRP tendons with unsaturated polyester resin matrix, but the elastic modulus will not change obviously, and the ultimate immersion period will reach 90 days. Both tensile strength and elastic modulus meet the minimum requirements stipulated in the standard.
【作者单位】：深圳海川新材料科技股份有限公司;上海启鹏工程材料科技有限公司;广东省长大公路工程有限公司;
【基金】：深圳市战略新兴产业发展专项资金项目(CXZZ20130321160417657)
【分类号】：TU528

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