Microstructure of cement paste with sugarcane bagasse ash under autoclave treatment
DOI:
https://doi.org/10.46421/enarc.v8i00.3030Keywords:
Microstructure of cementitious materials, Reactivity of sugar cane bagasse ash, Hydrated Calcium Silicate, Use of agro-industrial residuesAbstract
Portland cement stands as one of the most extensively used resources in the world, releasing CO2 emissions and depleting non-renewable natural resources. Additionally, Brazil holds the position of the world's largest sugar cane producer, generating a significant amount of waste. A potential solution to these environmental concerns involves replacing a portion of the cement mass by supplementary cementitious materials. Thus, this study aims to analyze the viability of integrating sugar cane bagasse ash (SCBA) into cementitious materials subjected to autoclave curing. Cement pastes with 25% SCBA were prepared and cured at room temperature or in autoclave conditions. The microstructure was examined using XRD, SEM, and hardness analysis. At room temperature, SCBA did not exhibit pozzolanic activity. However, under hydrothermal conditions, the SCBA reacted with Ca(OH)2, resulting in the formation of xonotlite. Consequently, the hardness of the CBCA sample increased nearly threefold following autoclave treatment.
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