BFRP bar has been recognized as one of the most promising alternative reinforcements to address the chloride-induced corrosion of steel bar-reinforced concrete structures in the marine environment. However, the high alkalinity of normal concrete is aggressive to BFRP bars, affecting their long-term bond performance. To address this issue, the bond durability performance of BFRP bar-reinforced low-alkalinity seawater sea sand concrete (SWSSC) after aging in seawater was investigated using the central pull-out test. Scanning electron microscopy (SEM) was also used to characterize the microstructure of BFRP bar-SWSSC interfaces. The findings revealed that since the corrosion of BFRP bars in low-alkalinity SWSSC is substantially lower, the bonding durability performance of BFRP bar-reinforced low-alkalinity SWSSC is significantly higher than that of ordinary SWSSC pull-out specimens. After 270 days of accelerated aging in seawater at 55 °C, bond strength retention in normal SWSSC specimens reduces to about 73 %, whereas that of low-alkalinity SWSSC specimens improves to about 107–110 %. The energy consumption and carbon emissions of low-alkalinity SWSSC are less than half of those of normal SWSSC.

中文翻译：

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采用低碱度海水海砂混凝土提高BFRP筋在海水环境中长期粘结性能的可行性研究


BFRP 钢筋已被认为是最有前途的替代钢筋之一，可解决海洋环境中钢筋混凝土结构氯化物引起的腐蚀问题。然而，普通混凝土的高碱度对 BFRP 筋有侵蚀性，影响其长期粘结性能。为了解决这个问题，采用中心拉拔试验研究了BFRP筋增强低碱度海水海砂混凝土（SWSSC）在海水中老化后的粘结耐久性能。扫描电子显微镜 (SEM) 也用于表征 BFRP 棒-SWSSC 界面的微观结构。研究结果表明，由于BFRP筋在低碱度SWSSC中的腐蚀明显较低，因此BFRP筋增强低碱度SWSSC的粘结耐久性能显着高于普通SWSSC拉拔试件。在 55°C 海水中加速老化 270 天后，正常 SSSSC 样品的粘结强度保留率降低至约 73%，而低碱度 SSSSC 样品的粘结强度保留率提高至约 107-110%。低碱度污水处理厂的能耗和碳排放量不到普通污水处理厂的一半。