Experimental study of the influence of the addition of limestone fillers on the fluidity coupled to the compressive strength of a self-compacting concrete.

Civil Engineering

Concrete formulation is the process of selecting components and their proportions to produce a material with specific properties prescribed in the standards (Eurocode), including consistency, strength and durability. Malagasy companies are struggling to produce contemporary works. For this purpose, limited budgets are devoted to the composition of new concretes. One of the most promising is self-placing concrete. For the realization thereof a percentage of calcareous filler is added to the cement paste. The purpose of this experimental study is to study the effects of the influence of the percentage of addition of fillers in the concrete on its consistency as well as the influence of these two parameters (concrete slump and percentage of addition of fillers) on the compressive strength of hardened concrete. For this experimental study, the preparation of numerous 16x32 cm cylindrical specimens was planned, using local materials, ie CEM II A-P 32.5 UT PM cement, and crushed aggregates from sedimentary rock. The concretes are formulated using the grain granulometry following the Dreux-Gorisse method supported by the BetonLab software. A cure in the open air was adopted for the test tubes made. This work presents the results of studies concerning, on the one hand, the properties of concrete in the fresh state (consistency as a function of the addition of limestone fillers) and, on the other hand, the compressive strength at 28 days of the concrete. The set of experimental results obtained constituted a database which allowed us to compare through a statistical analysis the models presented in the literature and the results of the tests.

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