Influence of Brazilian metakaolins in alkali-activated cements with a ternary blend of regional blast furnace slag and rice husk ash
DOI:
https://doi.org/10.19123/REixo.v13n3.15Keywords:
Alkali-Activated Cement, rice husk ash, metakaolinAbstract
Alkali-activated cements (AAC) are environmentally friendly products developed from raw materials containing calcium oxide (CaO), such as blast furnace slag, silica (SiO₂), such as fly ash, and materials composed of alumina (Al₂O₃), such as metakaolin. The addition of these compounds in AAC aims to improve its physicochemical properties while reducing the environmental impact of the cement industry. Thus, the objective of this study is to analyze the impact of two Brazilian metakaolins with distinct characteristics in the production of alkali-activated cements, using ternary blends that include regional blast furnace slag and rice husk ash. For this purpose, AAC pastes were produced with different proportions of slag, rice husk ash, and metakaolin (MKA and MKB), maintaining a SiO₂/Al₂O₃ ratio of 4.4. Tests were conducted for compressive strength at 7, 28, and 90 days of curing, isothermal calorimetry over 7 days, and microstructural analyses at 28 days. The results indicated that mixtures containing MKB showed better strengths, reaching 40 MPa at 28 days. However, it was found that despite the different degrees of amorphism and chemical compositions between the two MKs, the results were mainly influenced by the presence of calcium in the slag, promoting greater formation of hydrated products.
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