Abstract:

This paper presents the application of ultrasound method to study characteristics of concrete specimen destruction. Ultrasound system and uniaxial compression machine were combined to study material destruction characteristics which were built via relationships of ultrasound parameters (including the velocity and attenuation coefficient for 1 longitudinal wave, 2 transverse waves) and applied uniaxial load. The process of destructing concrete specimen, under the effect of mechanical load is divided into 3 phases: phase 1 corresponds to the closing of micro-cracks, fissures available in sample are perpendicular to the direction of the applied load, phase 2 is related to the formation and development of micro-cracks, parallel fissures to the applied load, phase 3 is related to the micro cracks and fissures connection to form the weak planes, weak zone