WASHINGTON METHOD OF DETERMINING AIR IN FRESH CONCRETE
THE WASHINGTON METHOD IS AN ADAPTATION OF THE PRESSURE PRINCIPLE IN A MANNER WHICH DIFFERS FROM THAT COMMONLY EMPLOYED. A CHAMBER CONTAINING AIR IS CONNECTED THROUGH A VALVE TO A SAMPLE OF CONCRETE IN A SEALED CONTAINER. WITH THE VALVE CLOSED, AIR IS FORCED INTO THE CHAMBER TO A MEASURED GAGE PRESSURE. WHEN THE CONNECTING VALVE IS OPENED, THE GAGE PRESSURE ON THE SYSTEM DROPS TO A VALUE DEPENDENT ON THE AIR CONTENT OF THE CONCRETE. ADVANTAGES OF THE METHOD ARE: (1) IN COMMON WITH OTHER PRESSURE METHODS, NO WEIGHT DETERMINATIONS ARE NEEDED AND THE PERCENTAGE OF AIR IN THE SAMPLE CAN BE READ DIRECTLY. (2) COMPARED TO OTHER PRESSURE METHODS, THE APPARATUS IS MORE COMPACT, DETERMINATIONS ARE MADE MORE RAPIDLY, NO WATER IS USED IN THE TEST, CORRECTIONS ARE NOT NEEDED UNDER VARYING BAROMETRIC PRESSURES, AND CALIBRATIONS CAN BE MADE READILY IN THE FIELD OVER THE FULL USABLE RANGE OF AIR CONTENTS. CONSTRUCTION OF THE DEVICE AND AUXILIARY APPARATUS IS ILLUSTRATED. /AUTHOR/
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Supplemental Notes:
- Vol 28, pp 210-218, 2 FIG, 2 TAB, 7 REF. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
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Authors:
- Tremper, B
- Gooding, W L
- Klieger, P
- Publication Date: 1949
Media Info
- Media Type: Digital/other
- Monograph Title: Proceedings of the Twenty-Eighth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 7-10, 1948
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Serial:
- Highway Research Board Proceedings
- Volume: 28
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Air; Polymer concrete; Pressure gages
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00213938
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Oct 18 1971 12:00AM