EFFECT OF THE ADMIXTURES REACTIVITY ON THE STRENGTH OF MORTARS: APPLICATION OF THE PREDECTIVE MODEL FOR BOLOMEY

The incorporation of admixtures in the cementing materials modifies their rheological and mechanical properties by a granular effect, a physicochemical and a chemical effect. In order to evaluate the chemical reactivity of the admixtures, we used an approach which consists on the volume substitution of the cement by the admixture in mixtures of which the absolute volume of the whole constituents are preserved constant and the workability fixed by using superplasticizers. Under these conditions, the mixtures have a volume of the flexible phase and an initial porosity constant and then, only the clean chemical effect of the admixture is taken into account.