Influence of Early Age Disturbance on Mechanical Properties of Concrete Based on Acoustic Emission Technology

Abstract

Abstract: In order to study the influence of early age disturbance on the mechanical properties of concrete and clarify its influence mechanism,the strength test and acoustic emission test were carried out in the initial and middle stages of condensation by means of indoor disturbance. The influence of early age disturbance on the mechanical properties of concrete was analyzed from the mesoscopic view. The results show that the early age disturbance has a great influence on the mechanical properties of concrete. The compressive strength of disturbed concrete increases in the initial stage of condensation, and decreases in the middle stage of condensation. Meanwhile, the influences of different disturbance parameters on the compressive strength of specimens are different. According to the analysis of different acoustic emission parameters, it is found that the smaller the number of initial microcracks is, the smaller the damage is and the greater the cumulative energy is when the specimen is destroyed, and the smaller the proportion of shear crack events is. The damage mechanism of early age disturbance on mechanical properties of concrete is explained from the perspective of initial microcracks.

Key words: concrete, early age disturbance, acoustic emission, mechanical property, microcrack, disturbance resistance

CLC Number:

TU528.1

ZHANG Changjiang, XU Baishun, ZHAO Zhimeng, NI Tianmeng, LIU Bin. Influence of Early Age Disturbance on Mechanical Properties of Concrete Based on Acoustic Emission Technology[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 3964-3975.

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