Calcined Illitic Clays as Portland Cement Replacements

  • Roxana Lemma
  • Edgardo F. Irassar
  • Viviana RahhalEmail author
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 10)


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.


Compressive Strength Clay Mineral Blended Cement Pozzolanic Activity Buenos Aires Province 
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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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Copyright information

© RILEM 2015

Authors and Affiliations

  • Roxana Lemma
    • 1
  • Edgardo F. Irassar
    • 1
  • Viviana Rahhal
    • 1
    Email author
  1. 1.Facultad de Ingeniería, CIFICEN (CONICET-UNCPBA)OlavarríaArgentina

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