Thanks, the terrorist attacks on the worldwide interest in the design of structures for\nfire greatly increased. One of the advantages of concrete over other building materials is its\ninherent fire-resistive properties. The concrete structural components still must be able to\nwithstand dead and live loads without collapse even though the rise in temperature causes a\ndecrease in the strength and modulus of elasticity for concrete and steel reinforcement. In\naddition, fully developed fires cause expansion of structural components and the resulting\nstresses and strains must be resisted. This paper reports the results of measurements by Impactecho\nmethod and measurement by ultrasound. Both methods are based on the acoustic\nproperties of the material which are dependent on its condition. These acoustic methods allow\nidentifying defects and are thus suitable for monitoring the building structure condition. The\nresults are obtained in the laboratory during the degradation of composite materials based on\ncement by high-temperature.
Loading....