Article Dans Une Revue Applied Clay Science Année : 2009

Clay content of argillites : Influence on cement based mortars

Résumé

The pozzolanic activity of four heated powders containing different clays has been tested. Mineral transformations during calcination from 20 to 900 °C have been followed by X-ray diffraction (XRD) and Differential Scanning Calorimetry (DSC). Compressive strength tests were performed at 1, 7 and 28 days on cement-clay mortars using 30% of pozzolanic material as a replacement by mass for cement. Calcination temperatures corresponded to the stages of potentially high reactivity identified by XRD. Results indicated that there exists incompatibility between clay minerals which can not be activated at the same temperatures. Products of recrystallisation of the earlier activated clay were already formed when the second clay type was activated. Concerning the type and the abundance of clay minerals in the raw material, this study evidences that the compressive strength is, at first approximation, correlated with the percentage of activated clay and less with the nature of the clay assemblage.

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Dates et versions

hal-00428838 , version 1 (29-10-2009)

Identifiants

Citer

Guillaume Habert, Nathalie Choupay, Gilles Escadeillas, D. Guillaume, J.M. Montel. Clay content of argillites : Influence on cement based mortars. Applied Clay Science, 2009, 43 (3-4), pp 322-330. ⟨10.1016/j.clay.2008.09.009⟩. ⟨hal-00428838⟩
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