The Use of Calcined Sediments and Limestone Fillers as Partial Replacements of Cement to Obtain Low-Carbon Cementitious Building Materials

Abstract

Nowadays, recycling materials is essential when it is related to sustainable development. Reducing raw material consumption, recycling, and reuse are the three fundamental pillars of sustainable building practices. Common Portland cement, which is used extensively in the building sector, emits a large amount of greenhouse gases and uses a lot of natural resources. Nevertheless, CO₂ emissions can be lessened by substituting some of the cement with pozzolanic materials. Concrete's strength and durability, both in a long or short time, are enhanced by this substitution. The objective of this study is to probe the effectiveness of the use of calcined sediments and limestone fillers as substitutes for cement in mortars. Various tests were conducted on fresh and hardened samples, with a focus on durability. The incorporation of limestone fillers in mortar formulations has shown a positive impact on compressive strength. Furthermore, over 180 days, the compressive strength of different types of mortars, composed of calcined sediments and limestone fillers, showed a consistent increase. However, the calcined sediments and limestone fillers have demonstrated good short-term durability. In conclusion, the incorporation of calcined sediments and limestone fillers as alternatives to conventional clinker in the manufacturing process helps in the fight against climate change by reducing the quantity of carbon dioxide discharged into the atmosphere.