Prepared and properties of filled and pozzolanic-filled cements from marble dust waste and granulated slag

Marble processing produces immense amounts of solid waste, which causes environmental issues. This work aims to “recycle marble dust waste” (MDW) with and without granulated slag to prepare filled as well as pozzolanic-filled cement. Innovative cement-based granulated slag and/or waste marble dust composites were fabricated. The Portland cement was partially substituted with different ratios of MDW up to 20 mass% to prepare filled cement. Pozzolanic-filled cements were prepared by the individual substitution of cement with 5 and 10 mass% of granulated slag with 5 mass% marble dust. The physical and mechanical properties such as bulk density and compressive strength were measured. The hydration products of some selected samples were additionally investigated by operating XRD, DSC, TGA analyses. The morphology of hardened samples was studied by SEM techniques. The results showed that a slight decrease in bulk density was identified with the increase in marble dust and granulated slag content in the cement matrix. Cement composites having 5 mass% MDW and 10 mass% of MWD and slag mixture recorded compressive strength lower than cement-blended containing 10 mass% MDW, but still higher than that of OPC. The XRD results proved that CSH and portlandite are the main hydration products with the formation of mono-and hemi-carbonate phases. SEM showed that cement paste containing 10% MDW has a denser microstructure than control sample.