A.Boudchicha - Assistance professor
M.Cheikh Zouaoui - Assistant professor
J.L.Gallias - professor
B.Mezghiche - professor

the incorporation of the fine or ultra fine admixture in the skeleton of a granular mélange modifies the theological and mechanical properties of the cementing materials; which are not always positives when they are introduced into the cementing mixtures in the absence of high range water reducers (super plasticizedr) . in the majority of the recent studies, the mineral admixtures were introduced into the mixture in a mass substation of cement. The approach used consists of the progressive volume substation of cement by the mineral admixtures in mixtures whose absolute volume of the whole constituent and workability are preserved constant and then, only the clean effect of the admixture particles in the cementing phase is taken into account. Under these conditions , the physical action of the admixtures an be evaluated by the variation of the water requirement and their chemical action, by the variation of the mechanical resistances according to the quantity of the built-in mineral admixture.

mortars , mineral admixtures , water requirement , compressive resistances ,physical action , chemical action