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ABSTRACT
Geopolymer concrete, an eco-friendly alternative to traditional Portland cement-based concrete, has garnered attention due to its reduced carbon footprint and superior mechanical properties. This study aims to investigate the effect of calcium hydroxide (Ca(OH)2) on Pulverized ceramic tiles as full substitute for metakaolin in geopolymer concrete. Metakaolin, a commonly used aluminosilicate precursor, contributes to the formation of the geopolymer binder. The methodology involves a systematic approach to assess the performance of geopolymer concrete incorporating varying proportions of calcium hydroxide as a replacement for metakaolin. Initially, different mix designs are formulated, with metakaolin partially replaced by calcium hydroxide at predetermined ratios. The fresh properties such as workability and setting time are evaluated alongside the hardened properties including compressive strength, flexural strength, and durability characteristics. Additionally, the alkali activation process and reaction kinetics are studied to understand the mechanism underlying the influence of calcium hydroxide on geopolymerization. In conclusion, I have been able to calcine the metakaolin and carry out pilot tests on the metakaolin to ensure it is reactive and will give the desire results. After 24 hours (1 day), 3 days and 7 days the compressive strength of the metakaolin-based geopolymer concrete was gotten as 43N/mm2 , 47N/mm2 and 49N/mm2 respectively. The results demonstrate that the incorporation of calcium hydroxide in geopolymer concrete exhibits promising outcomes. While metakaolin traditionally serves as the primary source of aluminosilicate in geopolymerization, calcium hydroxide shows potential as a supplementary activator. The replacement of metakaolin with calcium hydroxide leads to enhanced early-age strength development and reduced setting time.
