Heat treatment of concrete and its influence on the mechanical properties

Abstract

Concrete is used globally for all types of construction. This is mainly due to a market economy that has grown strongly in recent years and the particularities of its own. Despite its good performance at room temperature, concrete can have a critical behavior at high temperature. Analysis of the effects of high temperatures on the microstructure is necessary to understand the complex macroscopic phenomena step because the concrete undergoes physicochemical changes that strongly influence its thermomechanical behavior. Indeed, the strength of concrete can be greatly reduced by damage due to the rise in temperature as it entails the destruction of the constituent hydrates the cement paste by degradation of its mechanical properties such as stiffness, strength … The objective of our work is to study by thermogravimetric and differential thermal analysis (TGA / DTA) and the heated unheated concrete to follow the evolution of solid phases present in the latter when exposed to high temperatures.