Clam Shells (Megapitaria Squalida) For The Manufacture Of Mineral Additives In Concrete Mixes

Abstract

This research analyzes the feasibility of using chocolate clam shells (Megapitaria squalida) as a mineral additive in concrete mixtures to reduce the environmental impact of marine waste and the high consumption of Portland cement. A quantitative methodological approach was applied, including the collection, cleaning, crushing, calcination, and grinding of the biomaterial, followed by compressive strength and durability tests on concrete specimens with 10% partial cement replacement. The results showed that shells calcined at 800°C and 1000°C exhibit suitable pozzolanic properties and improve the mechanical strength of concrete, exceeding the values obtained in reference mixtures. Likewise, electrical resistivity tests indicated a very low chloride penetration, demonstrating high durability and good protection against steel reinforcement corrosion. The findings confirm that Megapitaria squalida shells, due to their high calcium carbonate (CaCO₃) content, represent a sustainable and economically viable alternative for producing eco-friendly concrete. Their incorporation contributes to reducing CO₂ emissions associated with cement manufacturing, promoting practices aligned with the Sustainable Development Goals (SDGs).