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Calcined Illitic Clays as Portland Cement Replacements

Lemma, Roxana / Irassar, Edgardo F. / Rahhal, Viviana

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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Calcined Illitic Clays as Portland Cement Replacements

Lemma, Roxana / Irassar, Edgardo F. / Rahhal, Viviana

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.

Calcined Illitic Clays as Portland Cement Replacements

Lemma, Roxana / Irassar, Edgardo F. / Rahhal, Viviana

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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Title:

Calcined Illitic Clays as Portland Cement Replacements

Additional title:

RILEM Bookseries

Contributors:

Scrivener, Karen (editor) / Favier, Aurélie (editor) / Lemma, Roxana (author) / Irassar, Edgardo F. (author) / Rahhal, Viviana (author)

Published in:

Calcined Clays for Sustainable Concrete ; Chapter: 33 ; 269-276

RILEM Bookseries ; 10

Publication date:

2015-05-08

Size:

8 pages

ISBN:

978-94-017-9939-3 , 978-94-017-9938-6

ISSN:

2211-0852 , 2211-0844

DOI:

https://doi.org/10.1007/978-94-017-9939-3_33

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Compressive Strength , Clay Mineral , Blended Cement , Pozzolanic Activity , Buenos Aires Province Engineering , Building Materials , Structural Materials , Theoretical and Applied Mechanics

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