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Using limestone filler to improve the early compressive strength, water permeability and acid sulfur resistance of slag based mortar / concrete

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Document pages: 17 pages

Abstract: Natural volcanic ash is widely used as a substitute for cement. Although its addition has economic, ecological and technical benefits, it is usually related to disadvantages, such as long-term wet curing and low early strength. The purpose of this study is to investigate the effect of limestone filler on the compressive strength and durability of slag containing mortar concrete. Sixteen kinds of slag (0,10,20 and 30 ) and limestone (0,5,10 and 15 ) binders with different degrees of substitution were prepared. The development of compressive strength of mortar concrete specimens was studied after curing for 2, 7, 28 and 90 days. In addition, the acid resistance of 28 day cured mortar was evaluated after 90 days of exposure to 5 H2SO4. concreteermeability was also evaluated after 2, 7, 28, and 90 days’ curing. Test results revealed that there was an increase in the early-age compressive strength and a decrease in water penetration depths with adding limestone filler. Contrary to expectation, the best acid resistance to 5 H2SO4 solution was noted in the mortars containing 15 limestone. Based on the results obtained, an empirical equation was derived to predict the compressive strength of mortars.

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