采用偏高岭土单掺以及与粉煤灰复掺取代水泥配制混凝土，在实际海洋环境浪溅区开展长期暴露试验，测试了暴露混凝土中总氯离子含量和自由氯离子含量，采用SEM-EDS测试了混凝土的水化产物形貌与元素分布，并采用XRD分析了暴露混凝土的物相组成。结果表明：偏高岭土可降低实际海洋环境下混凝土中氯离子浓度和氯离子扩散系数，提升混凝土氯离子固化能力，当与粉煤灰复掺时效果更佳。偏高岭土改善混凝土抗氯离子渗透性的机理在于，改善了混凝土结构密实性，提高了水化凝胶的A/S，降低混凝土碱性，促进了暴露混凝土中F盐的生成。此外，偏高岭土对于实际海洋环境下混凝土的长期抗硫酸盐侵蚀性没有不良影响。

Concrete containing metakaolin (MK) and ternary blends of MK and fly ash (FA) were prepared. A long-term exposure experiment at in-situ marine splash zone for the prepared concretes were carried out. Total and free chloride content of the exposed concretes were tested. SEM-EDS was used to analyze the morphology and element composition of the hydrates, while XRD was used to determine the phase component of the exposed concretes. The results show that the chloride content and chloride diffusion coefficient of concrete under actual marine environment are decreased with the application of MK, while the chloride binding capacity is enhanced. The improvement effect becomes more significant when FA is applied in the MK concrete. A denser structure of concrete can be obtained by the use of MK. Higher A/S and lower alkalinity of the hydrates of MK concretes promote the formation of Friedel’s salt. In addition, the application of MK did not have detrimental effect on sulfate resistance of the long-term exposed concretes.