Humidity and aggregate content correction factors for air-coupled ultrasonic evaluation of concrete

被引：33

作者：

Berriman, J ^{[1
]}

Purnell, P ^{[1
]}

Hutchins, DA ^{[1
]}

Neild, A ^{[1
]}

机构：

[1] Univ Warwick, Sch Engn, Coventry CV4 7AL, W Midlands, England

来源：

ULTRASONICS | 2005年 / 43卷 / 04期

关键词：

concrete; air-coupled ultrasound;

D O I：

10.1016/j.ultras.2004.07.003

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

This paper describes the use of non-contact ultrasound for the evaluation of concrete. Micromachined capacitance transducers are used to transmit ultrasonic longitudinal chirp signals through concrete samples using air as the coupling medium. and a pulse compression technique is then employed for measurement of time of flight through the sample. The effect on the ultrasonic wave speed of storing concrete samples, made with the same water/cement ratio, at different humidity levels is investigated. It is shown that there is a correlation between humidity and speed of sound, allowing a correction factor for humidity to be derived. A strong positive linear correlation between aggregate content and speed of sound was then observed; there was no obvious correlation between compressive strength and speed of sound. The results from the non-contact system are compared with that from a contact system, and conclusions drawn concerning coupling of energy into the samples. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：211 / 217

页数：7

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