Effects of carbonate on compressive strength and pore structure of ternary composite cement mortar
To study the effects of different carbonates(limestone,dolomite,magnesite)and non-carbonates(quartz)on the compressive strength and pore structure of ternary composite cement mortars,ternary composite cement mortar and paste samples were prepared under a water-to-binder ratio of 0.45,with 55%cement,30%metakaolin,and 15%variable components.The results indicated that after 28 days of curing,the pore structure of the ternary composite cement mortar containing carbonates was refined,significantly enhancing its compres-sive strength.However,after 90 days of curing,a large amount of calcium silicate hydrate formed in the ternary composite cement mortar containing non-carbonates,causing its compressive strength to exceed that of the com-posite cement mortar with carbonate components.Compared to pure cement mortar,the carbon dioxide emis-sions per unit mass of the ternary composite cement mortar were reduced by about 30%,which is of significant importance for promoting the development of green buildings.
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