Experimental research on correlation of acoustic parameters and stress of concrete with different admixtures

An ultrasonic test of 8 groups of 24 concrete specimens with different admixtures under different loading conditions is completed and the research of the influence of admixtures on the correlation of stress and acoustic parameters such as ultrasonic velocity of concrete, weighted spectral area and so on are done. This research indicates that steel fiber and iron powder can increase the sensitivity of ultrasound and stress of concrete in low stress condition, while the sensitivity of ultrasound and stress of concrete in high stress condition can be attenuated. In addition, the influence of aluminum powder and polypropylene fiber on the sensitivity of ultrasound and stress of concrete is not big.