Abstract
Different illitic clays (Buenos Aires Province, Argentine) were selected to study their potential pozzolanic activity. Clays were characterized by X-ray diffraction (XRD), Fourier transformed infra-red spectroscopy (FTIR) and thermal analysis (TG). Clays are calcined at 300, 600 and 950 °C and ground until 85 % mass passed through a 45 µm sieve. The pozzolanic activity was evaluated by the Frattini test and the strength activity index (SAI) at 2, 7 and 28 days on blended cements containing 25 % by weight of calcined clay. Results indicates that calcined illitic clays are suitable as raw material to prepare calcined clay pozzolan when they are fired at 950 °C as revels the Frattini test and they have a SAI from 0.75 to 0.94 at 28 days depending the amount of clayed minerals in the raw shale-stone. Secondary clay minerals don’t change significantly the pozzolanic behavior of illitic calcined clays.
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Acknowledgments
The authors would like to thank Eng. Monica Trezza for their assistance in carrying out the FTIR analysis, the CIC for the student-fellowship for Roxana Lemma and the ANPCYT for providing funding for the work under the PICT 0160-12.
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Lemma, R., Irassar, E.F., Rahhal, V. (2015). Calcined Illitic Clays as Portland Cement Replacements. In: Scrivener, K., Favier, A. (eds) Calcined Clays for Sustainable Concrete. RILEM Bookseries, vol 10. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9939-3_33
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DOI: https://doi.org/10.1007/978-94-017-9939-3_33
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