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Experimental Investigation on the Utilization of Marble and Scoria Powder as Partial Replacement of Cement in Concrete Production
This paper explores how marble and scoria powder can be used as partial substitutes for ordinary Portland cement in creating C-25 concrete. Both materials contain over 50% of the major oxides found in cement, with marble high in CaO and scoria high in SiO2. Experimental investigations were conducted to study the chemical, physical, mechanical, and fresh properties of concrete containing marble and scoria powder. For the investigation, 13 different mixes, including the control mix, were used with a constant waterβcement ratio of 0.5 and a slump range of 25β50βmm for concrete with a compressive strength (CS) of 25βMPa. Marble-to-scoria ratio of 2β:β1, 1β:β1, and 1β:β2 was used, and then the combined fraction of both marble waste and scoria in concrete was increased from 0% to 20% in 5% range. Including the control test specimens, a total of 117 (150βΓβ150βΓβ150βmm) concrete cubes for CS test, 39 (100βΓβ100βΓβ500βmm) concrete beam specimens for flexural strength test, 39 (100βΓβ200βmm) cylinder specimens for splitting tensile strength (STS) test and, 39 (100βΓβ100βΓβ100βmm) cube specimens for water absorption test were cast and tested at 3, 7, 28, and 56 days. The test results indicate that marble and volcanic scoria powders with marble-to-scoria ratio of 1β:β1 could replace cement up to 15% without compromising the CS and up to 10% without compromising the flexural and STS; also, the water absorption decreases up to 10% replacement; however, the workability of the fresh mix decreases as the combined replacement level of marble and scoria increases. Generally, a 10% replacement with marble-to-scoria ratio of 1β:β1 produces concrete with higher compressive, flexural, tensile strength, and water absorption manifestations when compared to conventional concrete