OPTIMISING THE FORMULATION OF CONCRETES USED IN RESIDENTIAL BUILDINGS IN CHAD

This study focuses on optimising the formulation of concrete used in residential buildings in Chad. Knowledge of the characteristics of materials through various laboratory tests, i.e. determination of the different characteristics of aggregates and cements, verification of the purity of the mixing water, and quality control of concretes, is of particular importance for compliance with the standard. Subsequently, this knowledge must be combined with the appropriate concrete formulation method: on the one hand, the Dreux-Gorisse method, which emphasizes the balance between concrete strength and workability, and on the other, the B. Scramtaiev method, which gives accurate results and seems to be the least well-known. The synthesis of all the analyses carried out in the course of this study can lead us to the kind of proposals for improvement that we consider useful and effective in the context of technical construction studies.It is in this context that our work is set, through experimental evaluation of the influence of cement dosage and type, E/C ratio, G/S ratio and aggregate cleanliness and grading, maximum aggregate diameter on compressive strength. The results obtained encourage new perspectives in the continuity of this work.The main objective of our work is to make a contribution to optimizing the formulation of concrete in the context of valorization of local materials, with the use of additives, in order to ensure adequate improvement of concrete characteristics.