Durability study of concrete-covered basalt fiber-reinforced polymer (BFRP) bars in marine environment
Durability study of concrete-covered basalt fiber-reinforced polymer (BFRP) bars in marine environment
复制标题
海洋环境中混凝土覆盖玄武岩纤维增强聚合物（BFRP）筋的耐久性研究
DOI：
10.1016/j.compstruct.2019.111650
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发表时间：
2020-02-15
影响因子：
6.3
通讯作者：
Xie, Jianhe
中科院分区：
文献类型：
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作者：
Lu, Zhongyu;Su, Lizhu;Xie, Jianhe
为了解玄武岩纤维增强聚合物（BFRP）钢筋用于海洋环境中混凝土结构加固的耐久性，将20 mm混凝土保护层的BFRP钢筋在室温（约23 ℃）下浸入海水或模拟海水中，研究其热机械性能的演变。研究了一组浸入海水和实验室加速模拟海水（23摄氏度，40摄氏度和60摄氏度）中的未覆盖的BFRP棒以进行比较。一年后，暴露的BFRP浸泡在60 ℃模拟海水中的力学性能表现出最大的退化，其次是混凝土覆盖的BFRP在实验室浸泡。在海水中，混凝土覆盖的BFRP比未覆盖的BFRP表现出更多的恶化。结果表明，碱度是影响BFRP降解的关键因素，尤其是在实验室环境中的静水中。此外，玄武岩纤维中的SiO2碱骨料反应（AAR）被发现在BFRP筋和混凝土之间的界面。树脂基体和上浆剂的降解导致玄武岩纤维直接暴露于碱性溶液中，这为AAR奠定了基础。
To understand the durability of basalt fiber-reinforced polymer (BFRP) bars for the reinforcement of concrete structures applied in marine environments, BFRP bars with 20-mm concrete covers were immersed in ocean water or simulated seawater at room temperature (similar to 23 degrees C), and the evolution of the thermomechanical properties was studied. A set of uncovered BFRP bars immersed in ocean water and laboratory accelerated simulated seawater (23 degrees C, 40 degrees C, and 60 degrees C) was investigated for comparison. After one year, the mechanical properties of the uncovered BFRP immersed in 60 degrees C simulated seawater showed the most degradation, followed by the concrete-covered BFRP in the laboratory immersion. Concrete-covered BFRP showed more deterioration than uncovered BFRP in the ocean water. The results indicated that the alkalinity is the key factor causing the degradation of BFRP, especially for standing water in the laboratory environment. In addition, an alkali-aggregate reaction (AAR) of SiO2 in basalt fiber was found at the interface between the BFRP bars and concrete. The degradation of the resin matrix and sizing led to the direct exposure of basalt fiber to alkaline solution, which established the foundation of the AAR.