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Investigation of Pozzolanic Binders Containing Calcined Laterites

  • Jean Pera (a1), Jean Ambroise (a1) and Ali Sadr Momtazi (a1)

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.

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References

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1. Moh, Z.C., Chin, Y.P. and Ng, S.C. Report presented at the 3 rd Asian Conference on Soil Mechanics, Haifa, Israel, 1967 (unpublished).
2. Ringsholt, T., Technical Report, Bandung, 1976 (unpublished).
3. Ambroise, J., Thesis, Lyon, France, 1984.
4. Ambroise, J., Murat, M., and Péra, J.. Cem. and Concr. Res., 2, n° 15, 261268, (1985).10.1016/0008-8846(85)90037-7
5. Ambroise, J., Gniewek, J., Dejean, J., and Péra, J.. Ceramic Bulletin, 66, 173–78, (1987).
6. Marvan, T., Thesis, Lyon, France (1990).

Investigation of Pozzolanic Binders Containing Calcined Laterites

  • Jean Pera (a1), Jean Ambroise (a1) and Ali Sadr Momtazi (a1)

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