Abstract
Metakaolin-based geopolymer has good resistance to seawater erosion, but it often requires more alkali activators, resulting in higher costs, and its curing time is far greater than that of alkali-activated slag materials. In this paper, geopolymers were prepared using metakaolin + slag as precursors and waterglass as activator to investigate the mechanisms of strength and microstructural deterioration over time of metakaolin/slag-based geopolymers under seawater conditions with different slag contents. It was found that the addition of an appropriate amount of slag could not only decrease the activator of metakaolin-based geopolymers, but also improve the pore solution pH and strength retention rate of metakaolin-based geopolymers. Different from alkali activated slag and silicate cements, the metakaolin/slag-based geopolymers will form a dense layer of brucite deposits in seawater after cured, which will significantly reduce the interaction between the metakaolin/slag-based geopolymer and seawater, combined with the good stability of metakaolin-based geopolymers itself in liquid environment, making metakaolin/slag-based geopolymers have very good resistance to seawater erosion.
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