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PROGRESS REPORT ON THE EXPERIMENTAL CURING SLABS AT ARLINGTON, VIRGINIA

THE BEHAVIOR OF CONCRETE PAVEMENT WAS STUDIED BY CONSTRUCTING A SERIES OF FORTY CONCRETE SLABS. THE CONCRETE WAS A 1:2:4 MIX WITH POTOMAC RIVER SAND AND POTOMAC RIVER GRAVEL AS AGGREGATES. THE MIXING AND PLACING WERE DONE UNDER WEATHER CONDITIONS AS NEARLY IDENTICAL AS POSSIBLE. THE KIND OF CONSTRUCTION WAS MADE TO COVER A WIDE RANGE OF VARIABLES TO PROVIDE INFORMATION ON THE FOLLOWING SUBJECTS: (1) COMPARATIVE EFFECT OF DIFFERENT METHODS OF CURING, (2) THE EFFECTS OF STEEL REINFORCING OF VARIOUS TYPES AND WEIGHTS IN DISTRIBUTING STRESSES OCCURRING FROM SHRINKAGE IN THE CONCRETE, (3) THE EFFECT OF EXPANSION JOINTS IN DISTRIBUTING STRESSES OCCURRING FROM SHRINKAGE IN THE CONCRETE, (4) THE EFFECT OF MOISTURE IN THE SUBGRADE IN REDUCING SHRINKAAGE CRACKING,(5) THE EFFECT AND PREVENTION OF RAPID DRIVING OF NEWLY PLACED CONCRETE, (6) THE MAGNITUDE AND EFFECT OF SUBGRADE RESISTANCE, (7) THE CURING OF CONCRETE PAVEMENTS, (8) POSSIBLE RELATION BETWEEN PAVEMENT BEHAVIOR AND TEST DATA FROM CONTROL SPECIMENS. IT IS INDICATED THAT THE MOST IMPORTANT REQUISITE FOR SATISFACTORY CURING IS TO PROTECT THE CONCRETE FROM DRYING OUT DURING THE FIRST 24 HOURS AFTER PLACING. RESULTS SHOW THAT SPECIMENS ON DRY SUBGRADE WITHOUT ANY CURING OBTAINED A HIGHER EARLY STRENGTH THAN THOSE ON A WET SUBGRADE COVERED WITH WET BURLAP FOR 24 HOURS AND WET EARTH FOR 13 DAYS. THE RESISTANCE OF THE SUBGRADE TO THE HORIZONTAL MOVEMENT OF THE SLAB WAS DETERMINED ON SEVERAL SUBGRADE CONDITIONS. THE AMOUNT OF CURLING OF SEVERAL SLABS WAS MEASURED OVER 24 HOUR PERIODS. THE CURLING CURVES INDICATE THAT A FIBROUS STRESS OF AT LEAST 100 POUNDS PER SQUARE INCH IS POSSIBLE. IT IS EVIDENT THAT SECONDARY TRANSVERSE CRACKING MAY OCCUR FROM THIS CAUSE, BEFORE THE CONCRETE HAS ATTAINED HIGH STRENGTH DUE TO THE DEAD WEIGHT OF THE SLAB AND AT A LATER PERIOD FROM TRAFFIC LOADS.

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  • Supplemental Notes:
    • Vol 6, pp 192-201, 5 FIG, 2 TAB. 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.
  • Authors:
    • Pauls, J T
  • Publication Date: 1927

Media Info

  • Media Type: Digital/other
  • Monograph Title: Proceedings of the Sixth Annual Meeting of the Highway Research Board Held at Washington, D.C., December 2-3, 1926
  • Serial:

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Filing Info

  • Accession Number: 00207141
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 11 1971 12:00AM