Influence des paramètres de composition et de cure sur la diffusivité des bétons à base de matériaux locaux.

Durability is one of the main concerns in the design, realization and maintenance of civil engineering works. Among the diseases of structures exposed to the marine environment, the reinforcement corrosion is the main cause of deterioration of reinforced concrete structures and the largest in terms of maintenance. This phenomenon is the result of many factors, more or less coupled, and related material to the environment. Concrete is more durable that it resists the penetration of aggressive agents. This quality is intrinsically dependent on several parameters: W/C, type of cement, formulation, conditions and duration of cure... An experimental program has enabled us to perform in the laboratory, test of the interactions isotherm to determine the amount of chlorides attached to a plain concrete using two strength classes of cement (CEMII/A-42.5 Beni Saf and CEMII/A-32.5 Zahana), our results show that the influence of the W/C ratio and the nature of cements used in the determination of chlorides in concrete is not considered very significant. We also performed tests of migration to measure the diffusion coefficient of chlorides and there has been an increase in the diffusion coefficient of chloride with increasing W/C ratio for all studied concretes, however, this ratio decreases with increase in the strength class of cement. In addition, a longer duration of cure favors the relative decrease of the diffusion coefficient. [ABSTRACT FROM AUTHOR]