TY - GEN
T1 - Assessment of the pozzolanic reactivity of calcined kaolinitic clays by a rapid alkaline solubility test
AU - Cabrera, E.
AU - Almenares, R.
AU - Alujas, A.
N1 - Publisher Copyright:
© RILEM 2018.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85033667728
U2 - 10.1007/978-94-024-1207-9_16
DO - 10.1007/978-94-024-1207-9_16
M3 - Conference contribution
AN - SCOPUS:85033667728
SN - 9789402412062
T3 - RILEM Bookseries
SP - 98
EP - 104
BT - Calcined Clays for Sustainable Concrete - Proceedings of the 2nd International Conference on Calcined Clays for Sustainable Concrete
A2 - Favier, Aurelie
A2 - Scrivener, Karen
A2 - Martirena, Fernando
PB - Springer Netherlands
T2 - 2nd International Conference on Calcined Clays for Sustainable Concrete, 2017
Y2 - 5 December 2017 through 7 December 2017
ER -