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Investigation of Pozzolanic Binders Containing Calcined Laterites

Published online by Cambridge University Press:  15 February 2011

Jean Pera ,
Jean Ambroise  and
Ali Sadr Momtazi
Jean Pera
Affiliation:
Laboratoire des Matériaux Minérâux, Bât. 407, INSA de Lyon, 20, Avenue Albert Einstein, 69621 VILLEURBANNE Cedex, FRANCE.
Jean Ambroise
Affiliation:
Laboratoire des Matériaux Minérâux, Bât. 407, INSA de Lyon, 20, Avenue Albert Einstein, 69621 VILLEURBANNE Cedex, FRANCE.
Ali Sadr Momtazi
Affiliation:
Laboratoire des Matériaux Minérâux, Bât. 407, INSA de Lyon, 20, Avenue Albert Einstein, 69621 VILLEURBANNE Cedex, FRANCE.
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Abstract

When heated at 750°C for five hours, African laterites show good pozzolanic activity. The kaolin content of the materials affects their pozzolanicity as indicated by lime reactivity. Blended cements containing 20, 30, 40, and 50% calcined laterite admixture were examined.

The rate of hydration was studied from compressive strength up to 90 days of curing and the hydrates formed as measured by DTA and XRD. The burnt laterite addition considerably reduced calcium hydroxide content and contributed to the formation of hydrated gehlenite (C2 ASH8) and gismondine (CASH).

The best compressive streng hs were obtained with blended cements containing 30% calcined laterite. In some cases, there was no more portlandite in binders where the replacement level of cement by burnt laterite was 50% by mass.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 245: Symposium K – Advanced Cementitious Systems: Mechanisms and Properties , 1991 , 25
Copyright
Copyright © Materials Research Society 1992

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References

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