This paper investigates the effects of coral sand powder (CSP) and corrosion inhibitors (SBT®-ZX(V), SBT®-RMA(II)) on reinforcement corrosion in coral aggregate seawater concrete (CASC) in a marine environment. A reasonable time-variation model for reinforcement corrosion in CASC is proposed and verified. Based on the time-variation model and chloride diffusion model, the cracking time and service life of CASC are predicted. The results show that the replacement of cementitious materials by 5% CSP can improve the corrosion resistance of steel bar in CASC. Both SBT®-ZX(V) and SBT®-RMA(II) can reduce the corrosion rate of steel bar in CASC, and this effect of SBT®-RMA(II) is more effective than that of SBT®-ZX(V). Among all CASC, CASC containing 5% CSP and SBT®-RMA(II) possesses the best corrosion resistance. The results also reveal that the corrosion current density of steel bar in CASC increases firstly and then decreases over time. The ascending segment of the fitting curves for reinforcement corrosion in CASC conforms to the logarithmic-type time-variation model, and the descending segment of the fitting curves for reinforcement corrosion in CASC conforms to the exponential-type time-variation model. The cracking time and service life of CASC containing 5% CSP and SBT®-RMA(II) will reach more than 10 years when the thickness of protective layer is 30 mm.

中文翻译：

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珊瑚砂粉和缓蚀剂对海洋环境珊瑚骨料海水混凝土钢筋腐蚀的影响

本文研究了珊瑚砂粉 (CSP) 和缓蚀剂 (SBT®-ZX(V)、SBT®-RMA(II)) 对海洋环境中珊瑚骨料海水混凝土 (CASC) 钢筋腐蚀的影响。提出并验证了合理的CASC钢筋腐蚀时变模型。基于时变模型和氯化物扩散模型，预测了CASC的开裂时间和使用寿命。结果表明，用5%的CSP替代胶凝材料可以提高CASC钢筋的耐腐蚀性能。SBT®-ZX(V) 和 SBT®-RMA(II) 都可以降低 CASC 中钢筋的腐蚀速率，并且 SBT®-RMA(II) 的这种效果比 SBT®-ZX(V) ）。在所有 CASC 中，含有 5% CSP 和 SBT®-RMA(II) 的 CASC 具有最好的耐腐蚀性。结果还表明，CASC中钢筋的腐蚀电流密度随着时间的推移先增加后减小。CASC钢筋腐蚀拟合曲线的上升段符合对数型时变模型，CASC钢筋腐蚀拟合曲线的下降段符合指数型时变模型。当保护层厚度为30mm时，含有5%CSP和SBT®-RMA(II)的CASC的开裂时间和使用寿命可达10年以上。CASC钢筋腐蚀拟合曲线下降段符合指数型时变模型。当保护层厚度为30mm时，含有5%CSP和SBT®-RMA(II)的CASC的开裂时间和使用寿命可达10年以上。CASC钢筋腐蚀拟合曲线下降段符合指数型时变模型。当保护层厚度为30mm时，含有5%CSP和SBT®-RMA(II)的CASC的开裂时间和使用寿命可达10年以上。