Investigation of the engineering properties of self-compacting mortar containing marble powder waste

The present research investigates the potential of using marble powder waste (MP), a byproduct of limestone, to build self-compacting mortar (SCM), with the goal of creating economic and environmental value by replacing cement with co-products and improving their handling and management. The aim is to improve the sustainability signature of cement-based materials in the construction industry. Five different mortar mix proportions, replacement of cement by MP at dosages of 0%, 10%, 20%, 30%, and 40%, are tested for slump flow, yield stress, viscosity, water absorption, bulk density, porosity, and compressive and flexural strength. The investigation delves into the influence of MP content on the rheological and mechanical properties. The results showed that the increase in marble powder led to an increase in both yield stress and plastic viscosity. Furthermore, the investigation found that a self-compacting mortar with a yield stress of 4.1 Pa at a 40% MP replacement rate and a viscosity of 2.9 Pa.s may achieve a slump flow of 242–351 mm. Furthermore, mortars containing 30% MP had a maximum compressive strength of 39.8 MPa at 28 days, which is a 7.4% increase over the reference mortar. Microstructure study showed that adding 30% MP improves mortar cohesiveness and densification. These findings demonstrate the potential of MP as a beneficial addition in SCM production, providing better performance and structural integrity. However, limitations in terms of specific application scenarios and long-term durability necessitate more exploration. Practical consequences include the potential for creative, sustainable, and cost-effective self-compacting concrete compositions, which will help to progress construction practices and environmental sustainability. Social consequences include the possibility for reduced environmental impact and increased resource efficiency in the construction industry. The results of the study provide an interesting insight into the possibility of using this kind of waste as a replacement for cement, thus reducing the demand for cement and the burden on landfills for disposing of such invasive waste from MP, and reducing the carbon footprint.