Experimental study on the effect of reinforcement ratio on the ultrasonic velocity and modal frequency of concrete members

Abstract

In order to study the effect of reinforcement ratio on ultrasonic sound velocity and modal frequency of reinforced concrete members, 13 concrete circular cross-section short columns were designed to detect the ultrasonic sound velocity and self-strain of short columns with different cuff ratio and longitudinal reinforcement ratio. Compared with non-reinforcing short columns, the results show that the stirrup reinforcement ratio is from 0.4% to 1.667%, the ultrasonic sound velocity is increased by 3.4%, the modal frequency is increased by 1.8%; the longitudinal reinforcement ratio is from 1.772% to 2.657%, the ultrasonic sound velocity is increased by 3.5%, and the modal frequency is increased 4.1%; the reinforcement can improve the ultrasonic sound velocity and the natural vibration frequency of the concrete to a certain extent, the change of the reinforcement ratio causes the same regular change of the sound velocity and the modal frequency.