Experimental study on the blasting-vibration safety standard for young concrete based on the damage accumulation effect.

• We designed a blasting-vibration damage accumulation experiment, during the experiment, the ultrasonic wave velocity was monitored, and the vibration damage value of the specimens were calculated. • We analyzed the change process of the ultrasonic wave velocity and the accumulation process of vibration damage after the samples were subjected to different vibration loads. • The strength and durability tests of the concrete were carried out to analyze the influence of the effect of damage accumulation from blasting vibration on the uniaxial compressive strength and the durability (impermeability, carbonization resistance, and resistance to chloride ion penetration) of young concrete. • Based on the experiment results, we put forward a blasting-vibration safety standard for young concrete based on the damage accumulation effect, in order to ensure the strength and durability of the concrete, the blasting-vibration velocity should be controlled within 1.5 cm/s. In blasting engineering practice, the accumulation of blasting-vibration damage is inevitable. The objective of this study is to put forward a blasting-vibration safety standard for young concrete based on the effects of damage accumulation. The ultrasonic wave velocity change process and the vibration damage accumulation process of the young concrete were investigated based on the blasting-vibration damage accumulation experiment. Furthermore, the influence of the damage accumulation effect on the compressive strength and durability of concrete were studied. Young concrete subjected to multiple vibration loads, when the vibration velocity is less than 1.0 cm/s, the change process of the ultrasonic wave velocity can be divided into three stages, the damage deterioration effect of vibration do not appear, and the vibration can improve the compressive strength and the durability of the concrete. However, when the vibration velocity is greater than 1.5 cm/s, the change process of the ultrasonic wave velocity goes through four stages, the damage deterioration effects of vibration begin to appear in the second stage and appear macroscopically in the third stage. If the vibration velocity reaches 3.5 cm/s, the damage deterioration effects appear macroscopically from the first stage, the compressive strength and durability of concrete decrease, and the degree of reduction increases with the increasing of vibration velocity. The experimental results indicate that the velocity of blasting ground vibration of 1.5 cm/s should be used as the blasting-vibration safety standard for young concrete based on the damage accumulation effect. These findings provide an experimental basis for the evaluation and control of the blasting-vibration for young concrete. [ABSTRACT FROM AUTHOR]