The durability of the concrete structure under the coupling effect of underwater corrosion particles has always been one of the hot issues at home and abroad. Aiming at the damage problem of the underground concrete structure in a marine and offshore chloride corrosion environment, based on the pile foundation engineering of the Coastal Industrial Park, the corrosion resistance test of pile foundation concrete is carried out. By preparing 7 kinds of pile foundation concrete samples with different mix proportions, the mechanical properties of concrete with different ages were analyzed under the coupling environment of groundwater. The chloride penetration resistance of concrete was analyzed by the RCM method, and the sulfate corrosion resistance was analyzed by the 17D accelerated simulation test. The test results show that with the decrease of the water-cement ratio and the increase of the cementitious material, the concrete damage is less and the durability is improved. It is suggested that the water-cement ratio of 0.34 and the cementitious material of 480 kg/m³ be selected for the preparation of the pile foundation concrete; when the content of fly ash is 15%, the antisulfuric acid corrosion ability of the concrete cementitious system can be enhanced and the concrete with 40% mineral powder has strong antichloride ion corrosion ability; the results show that the chloride diffusion coefficient of concrete samples with seven mix proportions is less than 610–12 m²/s, which can meet the durability design requirements and reduce the damage of concrete. The sulfate corrosion resistance of concrete samples with high-efficiency additives is the best.

中文翻译：

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水下耦合环境下混凝土耐久性研究

水下腐蚀颗粒耦合作用下混凝土结构的耐久性一直是国内外研究的热点问题之一。针对海洋和近海氯化物腐蚀环境下地下混凝土结构的破坏问题，以滨海工业园区桩基工程为基础，开展了桩基混凝土的耐腐蚀试验。通过制备7种不同配合比的桩基混凝土试样，分析了地下水耦合环境下不同龄期混凝土的力学性能。采用RCM法分析混凝土的抗氯化物渗透性能，采用17D加速模拟试验分析其抗硫酸盐腐蚀性能。试验结果表明，随着水灰比的降低和胶凝材料的增加，混凝土的损伤更小，耐久性提高。建议水灰比为0.34，胶凝材料为480 kg/m³选用配制桩基混凝土；粉煤灰含量为15%时，可增强混凝土胶凝体系的抗硫酸腐蚀能力，矿粉含量为40%的混凝土抗氯离子腐蚀能力强；结果表明，七种配合比混凝土试样的氯离子扩散系数小于6 10~12 m ² /s，能够满足耐久性设计要求，减少混凝土破坏。掺有高效外加剂的混凝土试样的耐硫酸盐腐蚀性能最好。