The Assessment of Cement Mortars after Thermal Degradation by Acoustic Non-destructive Methods

3rd International Conference on Innovative Materials, Structures and Technologies

Topolá, L.^1 ; Štefková, D.^1 ; Hoduláková, M.^1

Faculty of Civil Engineering, Brno University of Technology, Veveí 331/95, Brno

602 00, Czech Republic^1

关键词: Acoustic method;    Building structure;    High temperature;    Impact echo methods;    Nondestructive methods;    Steel reinforcements;    Structural component;    Terrorist attacks;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/251/1/012094/pdf
DOI  :  10.1088/1757-899X/251/1/012094

来源: IOP

【 摘 要 】

Thanks, the terrorist attacks on the worldwide interest in the design of structures for fire greatly increased. One of the advantages of concrete over other building materials is its inherent fire-resistive properties. The concrete structural components still must be able to withstand dead and live loads without collapse even though the rise in temperature causes a decrease in the strength and modulus of elasticity for concrete and steel reinforcement. In addition, fully developed fires cause expansion of structural components and the resulting stresses and strains must be resisted. This paper reports the results of measurements by Impact-echo method and measurement by ultrasound. Both methods are based on the acoustic properties of the material which are dependent on its condition. These acoustic methods allow identifying defects and are thus suitable for monitoring the building structure condition. The results are obtained in the laboratory during the degradation of composite materials based on cement by high-Temperature.