International Journal of Science, Engineering and TechnologyAuthors: TAMBIR HUSSAIN1, MD., ANZAR RABBANI
Abstract: The use of granulated slag and metakaolin as partial substitutes for cement has shown considerable promise in improving the mechanical characteristics and durability of concrete. Granulated slag, a byproduct of steel production, boosts long-term strength development and chemical resistance, while metakaolin, a thermally activated aluminosilicate, improves early-age strength and microstructural densification. This review methodically assesses current studies on the synergistic effects of supplemental cementitious materials (SCMs), concentrating on their influence on compressive strength, flexural performance, and durability against harsh conditions. Research demonstrates that ideal proportions of slag and metakaolin may enhance pore structure, decrease permeability, and alleviate sulphate attack and chloride ingress, thereby prolonging the lifespan of concrete buildings. Moreover, the pozzolanic reactivity of these materials facilitates the generation of secondary C-S-H gel, hence improving binding capacity and dimensional stability. The results highlight the feasibility of these sustainable additions in creating high-performance concrete with a reduced carbon impact. The durability improvements realised by including slag and metakaolin are due to their filler effect and pore-blocking capacity, which impede the penetration of detrimental ions and moisture. Experimental data indicates that slag-metakaolin hybrid systems provide enhanced resistance to acid corrosion, alkali-silica reaction (ASR), and carbonation relative to traditional concrete. The thermal stability of these composites renders them appropriate for harsh exposure circumstances. This paper examines the rheological features and workability issues related to various SCMs, suggesting admixture methods to ensure ease of installation. The research elucidates the environmental advantages of decreasing clinker concentration, as shown by life-cycle assessment (LCA) studies, without compromising performance. The integration of existing information offers a thorough foundation for enhancing mix designs and promoting sustainable building techniques, in accordance with worldwide initiatives for green infrastructure development.
DOI: http://doi.org/
