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Influence of Moisture on Ultrasonic Propagation, Acoustic Emission Activity, and Failure Mechanism in Concrete Media by Haoran Li; Shirong Meng; Dongping Shi; Qun Wei; Zhuang Xu; Weigang Zhao is a Engineering article available to read on EtoBox.

What is Influence of Moisture on Ultrasonic Propagation, Acoustic Emission Activity, and Failure Mechanism in Concrete Media about?

Free water in a concrete medium significantly influences its bearing capacity and failure mechanism. In this study, the mechanical properties and failure mechanism in concrete specimens with different moisture contents were investigated with the objective of enhancing the safety of concrete structures. Uniaxial compression tests were employed to study bearing capacity, ultrasonic propagation, acoustic emission activity and failure mechanism of concrete specimens with moisture contents of 0%, 2%, 4%, and 5.5%. The results implied that the crack initiation stress and compressive strength of concrete first increased and then decreased with the increase in moisture content, and the elastic modulus and Poisson’ s ratio first decreased and then increased. The inflection points were observed in the fitting curves for moisture contents within 1.15–1.65%. With the increase in the moisture in the concrete specimens, the ultrasonic propagation velocity in the material increased, the acoustic emission activity decreased, and the proportion of high-frequency acoustic emission signals decreased. The acoustic emission activity in the concrete specimens was observed predominantly in the failure st

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Author

Haoran Li; Shirong Meng; Dongping Shi; Qun Wei; Zhuang Xu; Weigang Zhao

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)