Detection of ASR in PCC using ultrasonic waves

N. M. Al-Akhras, I. L. Al-Qadi, M. R. Hajj

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

An experimental study was conducted to detect alkali-silica reaction (ASR) in Portland cement concrete (PCC) using ultrasonic waves (indirect method) at a frequency of 54 kHz. Portland cement concrete prisms, 7.5×10×40 cm, were prepared at two w/c ratios, 0.35 and 0.45. High alkali cement and active silica aggregate were used to produce ASR. Composite strain gages were embedded in the PCC specimens to monitor the ASR deleterious deterioration. Apparent ultrasonic wave velocity and signal energy were used to evaluate PCC specimens. Least significant difference (LSD) statistical test was used to compare the effect of different strain levels resulted from ASR on apparent ultrasonic wave velocity and signal energy. The results show that apparent ultrasonic wave velocity was not sensitive to variations in strain levels up to 0.12%. However, significant reduction in signal energy and variations in the power spectrum were noticed at low strain levels. These results allow to detect ASR at early stages.

Original languageEnglish (US)
Title of host publicationMaterials for the New Millennium
EditorsKen P. Chong
PublisherASCE
Pages897-904
Number of pages8
Volume2
StatePublished - 1996
Externally publishedYes
EventProceedings of the 1996 4th Materials Engineering Conference. Part 2 (of 2) - Washington, DC, USA
Duration: Nov 10 1996Nov 14 1996

Other

OtherProceedings of the 1996 4th Materials Engineering Conference. Part 2 (of 2)
CityWashington, DC, USA
Period11/10/9611/14/96

ASJC Scopus subject areas

  • Building and Construction

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