Evaluating the pozzolanic activity of andesite and calcined marl for high-performance concrete: a valorization of algerian mineral resources

This study evaluates the pozzolanic activity of andesite and calcined marl sourced from Algeria for potential use as supplementary cementitious materials. The research addresses the need for sustainable construction practices by leveraging local mineral resources. The objectives include assessing the pozzolanic properties of these materials and their effects on mortar mixes. The methodology involves collecting samples from specific quarries, crushing and grinding them into fine powders, and calcining the marl at 750°C. The materials were characterized using X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscopy (SEM). Pozzolanic activity was evaluated through Frattini and Saturated Lime Tests, followed by mortar mix analyses with varying substitution levels. Results indicated that andesite and calcined marl exhibit significant pozzolanic activity, with andesite showing the highest reactivity. The inclusion of these additives improved the formation of calcium silicate hydrate (C-S-H) and reduced portlandite content, enhancing the durability and mechanical properties of the mortar. The study concludes that these local mineral resources are viable alternatives to conventional cementitious materials, promoting sustainability in the construction industry.