Effects of Aging on Rebound Values and Ultrasonic Pulse Velocity of Concrete Components
To study the effects of long-term aging on the ultrasonic pulse velocity and rebound values of concrete components,three groups of concrete specimens with different strength grades(C20,C30,C40)and dimensions of 2,400 mm × 400 mm × 2,400 mm were prepared.Rebound values and ultrasonic pulse velocity were tested at aging periods of 4 days,7 days,14 days,28 days,90 days,180 days,365 days,730 days,951 days,1,350 days,and 1,730 days.Data analysis and linear fitting were performed to investigate the correlation between rebound values,ultrasonic pulse velocity,and aging.Results show that rebound values and ultrasonic pulse velocity increase rapidly in the early stages of aging but gradually stabilize after one year.For strength grades C30,the growth rate of the rebound coefficient increases with the strength grade;for strength grades＞C30,the trend reverses.Additionally,rebound values and ultrasonic pulse velocity exhibit a positive correlation,though a threshold exists beyond which both parameters stabilize and no longer increase significantly.
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