Abstract
Given the availability of clay deposits in several geographical areas of the Cuban territory and the use of calcined clays as a source of Supplementary Cementitious Materials (SCM), it is necessary to evaluate the pozzolanic reactivity of its calcination products and because of the complexity in the chemical - mineralogical characteristics of the pozzolans. This work introduces a new rapid method to predict the potential character pozzolanic of these materials by alkaline solubility and presents the possible correlation with isothermal calorimetry in lime-pozzolan pastes following the R3 protocol. The raw materials were characterized by XRF, XRD and TGA.
The clayey materials contain more than 70% of SiO2 + Al2O3 + Fe2O3, which guarantees its pozzolanic character after its thermal activation. The process of the dihydroxylation of the clay minerals happens between 350 °C and 650 °C, and for the deposit of Yaguajay the decomposition of the calcite is between 650 °C and 750 °C. Alkaline solubility test is a viable test to assess the pozzolanic reactivity of calcined kaolinitic clay due a good and directly correlation between the content of soluble aluminum and the total heat released (R = 0.995) and there is not a significant dispersion of the obtained data for each clay deposit (CV% between 0.01 and 2.80). The pozzolanic reactivity of its calcination products determined by isothermal calorimetric follows the sequence CG > LS > LL > YG and matches with Alkaline Solubility test.
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Acknowledgments
The authors would like to acknowledge the Instituto Superior Minero-Metalurgico of Moa, Cuba, for material support. In addition, the authors would like to thanks to the whole team of the “Low Carbon Cement” Project from CIDEM for all the advisory during this work.
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Cabrera, E., Almenares, R., Alujas, A. (2018). Assessment of the Pozzolanic Reactivity of Calcined Kaolinitic Clays by a Rapid Alkaline Solubility Test. In: Martirena, F., Favier, A., Scrivener, K. (eds) Calcined Clays for Sustainable Concrete. RILEM Bookseries, vol 16. Springer, Dordrecht. https://doi.org/10.1007/978-94-024-1207-9_16
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DOI: https://doi.org/10.1007/978-94-024-1207-9_16
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