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New NDE Technologies for Evaluating Reinforced Concrete Masonry / AM. Alexander, RW. Haskins

Conference Author
Masonry: Materials, Testing, and Applications (1998 : Nashville, TN)
Physical Description
1 online resource (14 pages) : illustrations, figures, tables
Additional Creators
Alexander, AM., Haskins, RW., American Society for Testing and Materials, and ASTM International
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Summary
Researchers at the Waterways'Experiment Station (WES) have demonstrated that two new nondestructive evaluation technologies show promise in making a more accurate diagnosis of the structural condition of concrete masonry walls than prior technologies. Traditionally, sounding with a hammer has been used to determine the presence and quality of the grout fill around the reinforcing bars in concrete masonry units (CMU's). First, WES has developed a new grout detection system, which senses the reverberating energy in the CMU's with a microphone. This energy is introduced into the CMU by using a pistol to fire a metal BB against the face of the block. A microphone and spectrum analyzer replaces the function of the human ear to distinguish different pitches of sound through sounding. Since a technician is more likely to get consistent results with the new system, it is not as subjective as sounding. Next, WES has evaluated the new digital steel detectors. A reinforced concrete masonry structure can contain many combinations of steel: vertical bars, horizontal bars, size of bar, number of bars, splices, etc. Digital steel detectors with microprocessors have the potential to provide much more information than traditional analog types.
Dates of Publication and/or Sequential Designation
Volume 1999, Issue 1356 (January 1999)
Subject(s)
Other Subject(s)
ISBN
9780803154049 (e-ISBN)
9780803126008
080312600X
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 6.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
Full text article also available for purchase.
Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1999. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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