偏高岭土(MK)是高岭土在500～800℃下煅烧脱羟基生成的一种无定型相活性材料.将MK按一定比例替代混凝土中的水泥可以改善混凝土的力学和耐久性能,并且由于水泥用量减少,这对于降低水泥生产过程中二氧化碳排放量以及节约能源有很大帮助,能够产生良好的经济和环境效益.重点综述了偏高岭土改性混凝土(MKC)在干燥收缩、吸水性和水渗透性、氯离子渗透性、抗硫酸盐侵蚀以及碳化5个方面的耐久性研究进展,最后对MKC耐久性研究的不足进行了探讨.%Metakaolin is an amorphous pozzolanic material formed by heating kaolin at about 500 ℃ to 800 ℃ which causes kaolinite dehydration.Substituting metakaolin for a certain amount of cement in the production of concrete can enhance the strength and durability of concrete,and moreover,reduce carbon emission and energy consumption duc to dccreased cement usage.This paper summarizes the research progress of metakaolin concrete's (MKC) durability from the perspectives of drying shrinkage,sorptivity and water permeability,chloride penetration,sulfate resistance,carbonization,also discusses the inadequacies of the current research in MKC's durability.
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