Propriétés mécaniques et perméabilités résiduelles de bétons exposés à une température élevée

ABSTRACT The present study consisted in subjecting five formulations of concrete, containing an identical volume of aggregates and presenting a variable water/cement ratio, to four heating-cooling cycles whose maximum temperatures were fixed at 150, 300, 450, and 600°C. Measurements of compressive strength, tensile strength, modulus of elasticity and gas permeability were then carried out on cylindrical specimens before and after heating. The results made it possible to determine the influence of certain parameters of the concrete formulation on the residual properties, the dehydration of the cementing matrix, the evolution of the permeability and the thermal stability when concrete is subjected to high temperature.