The effect of natural pozzolan on delayed ettringite formation of the heat-cured mortars

Abstract : Delayed Ettringite Formation (DEF) is an internal sulfate attack caused by early age heating to a temperature of over 70 degrees C. In this paper, the effect of natural Algerian pozzolan on the expansion of cement mortars caused by DEF was investigated. For this purpose, a portion of cement was replaced by natural pozzolan, with three different dosages (10%, 20% and 30%) and finenesses (fine, medium, and coarse). The results obtained highlighted the significant effects of natural pozzolan on DEF and the correlation existing between the expansion of the heat-cured mortars and the evolution of their mechanical properties.
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van Huong Nguyen, Ali-Nordine Leklou, Jean-Emmanuel Aubert, Pierre Mounanga. The effect of natural pozzolan on delayed ettringite formation of the heat-cured mortars. Construction and Building Materials, Elsevier, 2013, 48, pp.479-484. ⟨10.1016/j.conbuildmat.2013.07.016⟩. ⟨hal-01007361⟩

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