Research on Evaluation of Elastic Modulus of Early Age Concrete by Ultrasonic Velocity

点击翻译按钮获取中文摘要

The composition of a concrete material, like sand-aggregate ratio or coarse aggregate content, strongly influences ultrasonic wave velocity of concrete. In early age concrete with small cement matrix strength, the tendency is more remarkable. Therefore, in order to generalize the measurement technique by the ultrasonic wave velocity, it is necessary to evaluate the influence of the aggregate content. In this study, the model assumed that the ultrasonic velocity of aggregate influenced ultrasonic velocity of concrete by the percentage of the aggregate volume content. And, we tried the quantification of the influence that the aggregate content exerted on ultrasonic velocity of concrete. In addition, based on those results, we proposed the technique for evaluating the change in the stiffness coefficient of the early age concrete from the measurement result of a ultrasonic wave velocity of concrete.