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Abstract
Abstract Marble cutting waste (MCW) and fly ash (FA) have great potential to enhance the performance of concrete and to be a partial substitute of cement. With this aim, a total nine number of high-strength concrete (HSC) mixes were prepared to investigate the efficiency of MCW and FA in HSC with silica fume (SF) as a separate and combined replacement of cement. Cement was replaced with MCW at the ratios of 10%, 20%, and 30%. FA was substituted in HSC at a substitution level of 15% of total cement. To achieve HSC mix, 5% SF was incorporated in HSC mix as a substitute of cement and constant water to binder ratio of 0.33 was maintained throughout the study. Mechanical properties were evaluated by compressive strength test and flexural strength test at 7, 28 and 90 days of curing periods. Water permeability and abrasion resistance were evaluated after 28 days curing period. The microstructural investigation was also performed using scanning electron microscope (SEM) analysis. Incorporation of MCW and FA resulted in enhanced workability. A substitution level of 10% MCW, 15% FA, and 5% SF of the total cement content revealed the optimum results in terms of fresh and mechanical and durability performance.
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