Life Cycle Assessment of Cement Production with Marble Waste Sludges Ruiz Sánchez, Antonio Castillo Ramos, Ventura Sánchez Polo, Manuel López Ramón, María Victoria Rivera Utrilla, José Marble waste sludge Life Cycle Assessment (LCA) CO2 Emissions Greenhouse gases (GHG) Cement Limestone Environment The construction industry has a considerable environmental impact in societies, which must be controlled to achieve adequate sustainability levels. In particular, cement production contributes 5–8% of CO2 emissions worldwide, mainly from the utilization of clinker. This study applied Life Cycle Assessment (LCA) methodology to investigate the environmental impact of cement production and explore environmental improvements obtained by adding marble waste sludges in the manufacture of Portland cement. It was considered that 6–35% of the limestone required for its production could be supplied by marble waste sludge (mainly calcite), meeting the EN 197-1:2011 norm. Energy consumption and greenhouse gas (GHG) emission data were obtained from the Ecovent database using commercial LCA software. All life cycle impact assessment indicators were lower for the proposed “eco-cement” than for conventional cement, attributable to changes in the utilization of limestone and clinker. The most favorable results were achieved when marble waste sludge completely replaced limestone and was added to clinker at 35%. In comparison to conventional Portland cement production, this process reduced GHG emissions by 34%, the use of turbine waters by 60%, and the emission of particles into the atmosphere by 50%. Application of LCA methodology allowed evaluation of the environmental impact and improvements obtained with the production of a type of functional eco-cement. This approach is indispensable for evaluating the environmental benefits of using marble waste sludges in the production of cement. 2021-10-20T06:51:44Z 2021-10-20T06:51:44Z 2021 journal article Sánchez, A.R.; Ramos, V.C.; Polo, M.S.; Ramón, M.V.L.; Utrilla, J.R. Life Cycle Assessment of Cement Production with Marble Waste Sludges. Int. J. Environ. Res. Public Health 2021, 182, 968. https://doi.org/10.3390/ ijerph182010968 http://hdl.handle.net/10481/70991 10.3390/ijerph182010968 eng http://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España MDPI