DEFERRED BEHAVIOUR OF THE SELF COMPACTING CONCRETES BASED LOCAL MATERIALS

This paper inscribed in the setting of the research onto concrete material conducted the team within engineering of the materials of the laboratory materials and durability of the constructions, in the context of the conception of the self compacting concrete to basis of the local materials. The concept of the self compacting concrete that is born of a need of economy and quality increased for the constructions of reinforced concrete. The present document treats the deferred behaviour (creep and shrinkage of the self compacting concretes); for this phenomenon, we elaborated an experimental program therefore. For a better approach, the study was comparative: the tests have been made in parallel, in the time, on a concrete at low strength and concrete at medium strength with a compressive strength to 28 days of 20 and 40 MPa respectively. It has been put in evidence a kinetics of creep of the SCC of low strength similar to the one of the SCC of medium strength, whereas this kinetics is notoriously different from the one of the VC. The gotten results are comparable to those gotten in the literature. This study brings a lighting on the deformations deferred of these new concretes and should help towards term, to the setting up of rules of formulation of the self compacting concretes. Finally some of the results gotten are used in the goal to propose an optimization of the mixtures according to criterias of justified choices