Effect of Different Constituent Fiber, Resin, and Sizing Combinations on Alkaline Resistance of Basalt, Carbon, and Glass FRP Bars
Effect of Different Constituent Fiber, Resin, and Sizing Combinations on Alkaline Resistance of Basalt, Carbon, and Glass FRP Bars
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DOI：
10.1061/(asce)cc.1943-5614.0001009
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发表时间：
2020-06-01
影响因子：
4.6
通讯作者：
Manalo, A.
中科院分区：
文献类型：
--
作者：
Benmokrane, B.;Hassan, M.;Manalo, A.
当用作内部增强时，纤维增强聚合物（FRP）复合钢筋暴露于高碱性（pH > 12.5）混凝土环境。本研究评估了24种类型的FRP筋在模拟碱性混凝土环境中的耐久性，特别是相对于碳化纤维类型（碳，玄武岩和玻璃），纤维尺寸，树脂化学和制造商。共10种类型的玻璃纤维，包括两种类型的E-玻璃纤维和八种类型的耐电腐蚀（ECR）-玻璃纤维，四种类型的玄武岩纤维，两种类型的碳纤维，六种类型的基于乙烯基酯，聚氨酯和环氧树脂的树脂系统，以及五种类型的专有纤维胶料用于制造棒材。根据加拿大标准协会（CSA）和美国材料与试验协会（ASTM）的标准，该研究重点评估了在60摄氏度下进行3个月加速碱性调节的FRP筋的拉伸、横向剪切和层间剪切性能。这些钢筋的强度保留和故障进行了评估，作为衡量目前市场上的FRP钢筋的耐久性和长期性能，并由制造商进行质量控制。采用独立样本t检验和单因素方差分析进行统计分析，结果表明，FRP筋的制造工艺参数对FRP筋的力学性能和耐碱性有显著影响。特别是，结果表明，用相同的参数和纤维类型，但由不同的纤维制造商与不同的纤维尺寸和树脂系统生产的FRP筋在碱性环境中具有完全不同的强度性能和耐久性性能的酒吧。乙烯基酯树脂和硅烷施胶纤维是最兼容的树脂系统，并产生更耐用的玻璃纤维增强塑料筋，而环氧树脂产生更耐用的玄武岩和碳纤维增强塑料筋。本文还介绍了一个程序和一个标准的最佳制造参数，以实现特定的力学性能和耐久性能与FRP筋。
When used as an internal reinforcement, fiber-reinforced-polymer (FRP) composite bars are exposed to a highly alkaline (pH > 12.5) concrete environment. This study evaluated the durability of 24 types of FRP bars in a simulated alkaline concrete environment, specifically with respect to reinforcing-fiber type (carbon, basalt, and glass), fiber sizing, resin chemistry, and manufacturer. A total of 10 types of glass fibers, including two types of E-glass fibers and eight types of electrical corrosion resistance (ECR)-glass fibers, four types of basalt fibers, two types of carbon fibers, six types of resin systems based on vinyl ester, polyurethane, and epoxy resins, and five types of proprietary fiber sizings were used in manufacturing the bars. The study focused on assessing the tensile, transverse-shear, and interlaminar-shear properties of FRP bars subjected to 3 months of accelerated alkaline conditioning at 60 degrees C, as per Canadian Standards Association (CSA) and American Society for Testing and Materials (ASTM) standards. The strength retention and failure of these bars were evaluated as a measurement of the durability and long-term performance of the FRP bars currently available on the market and for quality control by manufacturers. Statistical analysis using independent samples t-test and one-way analysis of variance revealed that the manufacturing parameters have a significant effect on the mechanical characteristics and alkaline resistance of FRP bars. In particular, the results show that the FRP bars manufactured with the same parameters and fiber types but by different fiber manufacturers with different fiber sizings and resin systems produced bars with totally different strength properties and durability performance in an alkaline environment. Vinyl ester resin and silane-sized fiber was the most compatible resin system and produced a more durable glass-FRP bar, while the epoxy resin yielded more durable basalt- and carbon-FRP bars. This paper also describes a procedure for and a criterion of the optimum manufacturing parameters to achieve specific mechanical properties and durability performance with FRP bars.