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Title: MEASUREMENT OF VOLUME CHANGES OF CONCRETE IN SERVICE
Accession Number: 00213694
Record Type: Component
Abstract: A PROGRAM OF PRECISE LENGTH-CHANGE MEASUREMENTS WAS UNDERTAKEN BY THE PORTLAND CEMENT ASSOCIATION IN 1954 IN COOPERATION WITH SEVERAL STATE HIGHWAY DEPARTMENTS AND OTHER ORGANIZATIONS. THE EQUIPMENT DEVELOPED CONSISTED OF A 100- IN. INVAR STEEL TAPE, WITH MEANS FOR ATTACHING TO BRASS INSERTS IN THE CONCRETE AND FOR APPLYING A TENSION OF 30 LB. TWO DIFFERENT TAPES ARE USED AND THE CALCULATED MEASUREMENTS ARE CHECKED WITHIN A TOLERANCE OF 0.002 IN. THE INTERNAL TEMPERATURE OF THE CONCRETE IS OBTAINED AND THE MEASUREMENTS ARE CORRECTED TO 74F, THE TEMPERATURE AT WHICH THE TAPE IS CALIBRATED IN THE LABORATORY. AFTER TEN YEARS OF OBSERVATION, A FEW OF THE BRASS INSERTS WERE DESTROYED OR DAMAGED BEYOND USE, BUT MANY OF THE ORIGINAL POINTS REMAINED UNDAMAGED. THE CONCRETE IN 12 BRIDGES HAS SHOWN NO APPRECIABLE DIMENSIONAL CHANGE IN EITHER DIRECTION. DURING THE SAME PERIOD, CONCRETE THAT WAS CRACKED, AND KNOWN TO BE AFFECTED BY ALKALI-AGGREGATE REACTION, HAS SHOWN A STEADY RATE OF EXPANSION.
Supplemental Notes: 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.
Monograph Title: Monograph Accession #: 01410776
Corporate Authors: Highway Research Board (HRB) Washington, DC Authors: Oleson, Calvin CPagination: pp 41-43
Publication Date: 1970
Media Type: Digital/other
Features: Figures
(6)
TRT Terms: Old TRIS Terms: Subject Areas: Highways; Materials
Files: TRIS, TRB, ATRI
Created Date: Aug 17 1970 12:00AM
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