Influence of moisture on the diffusion of ultrasound in concrete

IF 3.8 2区物理与天体物理 Q1 ACOUSTICS

Ultrasonics Pub Date : 2024-11-22 DOI:10.1016/j.ultras.2024.107529

Eunjong Ahn , Homin Song , Myoungsu Shin , John S. Popovics

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引用次数: 0

Abstract

This study aimed to investigate the effects of internal moisture migration and subsequent drying-shrinkage-induced micro-cracking in concrete on diffuse ultrasound, through a series of experiments that comprised multiple drying and rewetting cycles carried out over the long-term. Cyclic drying and wetting phenomena in concrete were physically established following a predefined protocol and were traced measuring the mass change of specimens. Diffuse-wave tests were conducted using a pair of PZT patches bonded to cylindrical specimens, which acted as the ultrasonic transmitter and receiver in the range of 250–550 kHz. The results present that measured diffuse-wave parameters, diffusivity and dissipation, showed distinct varying and cyclic behaviors to drying and wetting processes, but they did not recover their original values in the saturated condition, revealing possible micro-cracking damage caused by the drying process, which should be understood to improve the reliability of diffuse ultrasound measurements in concrete subjected to environmental changes.

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水分对超声波在混凝土中扩散的影响

本研究旨在通过一系列长期进行的多次干燥和再湿润循环实验，研究混凝土内部水分迁移和随后干燥收缩引起的微裂缝对漫射超声波的影响。混凝土中的循环干燥和润湿现象是按照预定方案通过物理方法确定的，并通过测量试样的质量变化进行追踪。扩散波测试使用一对粘接在圆柱形试样上的 PZT 贴片进行，这对贴片充当 250-550 kHz 范围内的超声波发射器和接收器。结果表明，测得的扩散波参数、扩散率和耗散率在干燥和湿润过程中表现出明显的变化和循环行为，但在饱和状态下没有恢复其原始值，揭示了干燥过程可能造成的微裂缝破坏，应了解这一点以提高受环境变化影响的混凝土中扩散超声测量的可靠性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ultrasonics 医学-核医学

CiteScore

7.60

自引率

19.00%

发文量

186

审稿时长

3.9 months

期刊介绍： Ultrasonics is the only internationally established journal which covers the entire field of ultrasound research and technology and all its many applications. Ultrasonics contains a variety of sections to keep readers fully informed and up-to-date on the whole spectrum of research and development throughout the world. Ultrasonics publishes papers of exceptional quality and of relevance to both academia and industry. Manuscripts in which ultrasonics is a central issue and not simply an incidental tool or minor issue, are welcomed. As well as top quality original research papers and review articles by world renowned experts, Ultrasonics also regularly features short communications, a calendar of forthcoming events and special issues dedicated to topical subjects.