Durability of cement mortar-covered BFRP bars in simulated seawater environment
Durability of cement mortar-covered BFRP bars in simulated seawater environment
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模拟海水环境中水泥砂浆覆盖的 BFRP 筋的耐久性
DOI：
10.1016/j.conbuildmat.2019.117803
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发表时间：
2020-02
影响因子：
7.4
通讯作者：
Xie Jianhe
中科院分区：
文献类型：
--
作者：
Lu Zhongyu;Tan Sirong;Huang Peihao;Lei Zhoupeng;Liu Feng;Xie Jianhe
为评估玄武岩纤维增强聚合物（BFRP）筋在海洋工程混凝土结构中的耐久性，研究了水泥砂浆包覆BFRP筋在模拟海水环境中的热力学性能变化。覆盖厚度设定为10 mm和20 mm，浸渍温度为室温（约28 ℃）、40 ℃和60 ℃，浸渍介质为碱性溶液和蒸馏水。一组裸露的玻璃纤维增强聚合物（GFRP）筋用于比较。一年后，浸泡在60 °C碱性溶液中的裸BFRP筋的力学性能恶化最严重，室温下浸泡在蒸馏水中的裸BFRP筋和10 mm和20 mm水泥砂浆覆盖试件的抗拉强度分别从954.2 MPa下降到762.3、594.7和515.5 MPa。结果表明，碱度是引起BFRP材料劣化的关键因素，且在大粒径水泥砂浆中劣化更为明显。此外，碱骨料反应（AAR）的玄武岩纤维中的SiO2的存在下，一个白色凝胶在BFRP棒和水泥砂浆之间的界面证明。因此，AAR是不利的水泥砂浆覆盖BFRP试件的力学性能在初始阶段。随着浸泡时间的增加，水泥砂浆层表现出保护效果，特别是对于小尺寸的水泥砂浆覆盖的标本。由于GFRP的纤维体积分数较高，BFRP筋比GFRP筋更耐用。
To assess the durability of basalt fibre-reinforced polymer (BFRP) bars used to reinforce concrete structures in ocean engineering, the evolution of the thermomechanical properties of cement mortar-covered BFRP bars immersed in simulated seawater environments was studied. The cover thicknesses were set as 10 mm and 20 mm, the immersion temperatures were room temperature (≈28 °C), 40 °C, and 60 °C, and the immersion media were an alkaline solution and distilled water. A set of bare glass fibre-reinforced polymer (GFRP) bars was used for comparison. After one year, the mechanical properties of the bare BFRP bars immersed in a 60 °C alkaline solution deteriorated the most, and the tensile strength decreased from 954.2 MPa to 762.3, 594.7, and 515.5 MPa for the bare BFRP bars and the 10 mm and 20 mm cement mortar-covered specimens immersed in distilled water at room temperature, respectively. The results indicated that alkalinity is a key factor causing the degradation of BFRP and that deterioration is more evident in large-sized cement mortar. In addition, an alkali–aggregate reaction (AAR) of SiO2in the basalt fibre was evidenced by the presence of a white gel at the interface between the BFRP bars and cement mortar. Thus, AAR is detrimental to the mechanical properties of the cement mortar-covered BFRP specimens in the initial stage. With an increase in immersion time, the cement mortar layer exhibited a protective effect, particularly for the small-sized cement mortar-covered specimens. The BFRP bars are more durable than the GFRP bars owing to the higher fibre volume fraction of GFRP.
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影响因子：
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作者：
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作者：
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