In order to solve the problem that the cementitious materials are easy to expand when exposed to water and af-fect the strength in the in-situ repair process of solid waste landfill leakage.KH560 with amphoteric groups was added to sodi-um polyacrylate and electrolytic manganese slag by two-step aqueous solution polymerization method to prepare electrolytic manganese slag-based composite cementitious materials.The compressive impermeability and corrosion resistance of the consol-idated body were analyzed by water seepage test and corrosion test,the molecular structure of the consolidated body was charac-terized by infrared spectroscopy(FTIR),and the surface morphology and element content changes of the consolidated body were analyzed by SEM-EDS,and the mechanical enhancement mechanism and anti-seepage mechanism of KH560 on the elec-trolytic manganese slag cementitious material were revealed.The results show that:① the compressive resistance,impermeabili-ty and corrosion resistance of the composite cementitious material can be significantly improved by adding KH560 in an appro-priate amount 3%,and the unconfined compressive strength of the consolidated body is 2.25 times that of the consolidated body without KH560,and the permeability coefficient is 61.3%lower than that of the consolidated body without KH560,and the cor-rosion resistance coefficient is 0.85.② The siloxy group Si—OCH3 in the molecular structure of KH560 underwent a hydrolyt-ic condensation reaction with the free water in the electrolytic manganese slag to form a Si—O—Si connection structure,which reduced the water gap channel,made the surface of the consolidated body smooth,and significantly improved the impermeability effect and corrosion resistance.
KH560electrolytic manganese slagcompressive strengthpermeability coefficientmechanism of action
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