Evaluation of Fire-Damaged Concrete Structures Using the Non-Destructive Testing

Abstract

This study analyzes the impact of high temperatures on the physico-chemical properties of concrete, highlighting a marked decrease in strength and material integrity. Among the mechanical non-destructive testing methods, the rebound hammer technique was selected for its accessibility, speed, and capacity to deliver preliminary on-site results. Field data obtained at fire-damaged sites reflect the extent of material degradation and enable the identification of critical heat-affected zones and potential fire origin points. By comparing the strength of concrete in damaged versus intact areas, the most severely affected zones can be identified.