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In order to study the effect of water cement ratio on the damage degree of concrete at different stress levels, the acoustic and acousto-ultrasonic characteristics of concrete with different water cement ratio under multi-stage loading were analyzed. It was concluded that with the increase of the damage degree of concrete, the damage variable and the third harmonic ratio increased, while the acousto-ultrasonic velocity and acousto-ultrasonic energy decreased. Among them, the third harmonic ratio was the most sensitive parameter affecting the damage degree. The compressive strength of concrete decreased with the increase of water cement ratio, and they were linearly related. Furthermore, with the increase of the stress level or the increase of the water cement ratio, the damage of concrete occurred during the holding period increased.

Identification of the damage degree of concrete with different water cement ratios using the acousto-ultrasonic technique