IDENTIFICATION OF AGGREGATES CAUSING POOR CONCRETE PERFORMANCE WHEN FROZEN INTERIM REPORT
IMPROVED QUALITY TESTS FOR AGGREGATES WERE DEVELOPED FROM ANALYSIS OF 32 DIFFERENT CONCRETES CONTAINING COARSE AGGREGATES RANGING FROM CRUSHED TRAP ROCK AND LIMESTONE TO A VARIETY OF GRAVELS FROM GLACIAL AND NON-GLACIAL SOURCES. CONCRETE SPECIMENS WERE FABRICATED AND EXPOSED TO ALTERNATE CYCLES OF FREEZING AND THAWING WHILE IN WATER TO OBSERVE DESTRUCTIVE VOLUME CHANGES OF THE COARSE AGGREGATES. THE SPECIMENS WERE MEASURED FOR LENGTH, WEIGHT, AND DYNAMIC MODULUS AT THE END OF SPECIFIED NUMBERS OF CYCLES. FROM THE DATA OBTAINED, AN ATTEMPT WAS MADE TO CORRELATE DURABILITY AS MEASURED BY DYNAMIC MODULUS WITH CERTAIN CHARACTERISTICS OF THE TEMPERATURE-LENGTH CHANGE CURVE. THE SLOPE OF THE LENGTH CHANGE-TIME CURVE OF THE DEEP-FREEZE SPECIMENS ALSO CORRELATED WELL WITH THE DURABILITY FACTOR. IT WAS CONCLUDED THAT THE WHITTEMORE STRAIN GAGE AND A DEEP-FREEZE UNIT COULD BE USED AS BASIC EQUIPMENT FOR A QUICK PRELIMINARY EVALUATION OF A COARSE AGGREGATE.
- Record URL:
-
Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/00775614
-
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. No 12, pp 1-47, FIG, TAB, REF, APP
-
Authors:
- WALKER, R D
- Publication Date: 1965
Media Info
- Media Type: Digital/other
-
Serial:
- NCHRP Report
- Issue Number: 12
- Publisher: Transportation Research Board
- ISSN: 0077-5614
Subject/Index Terms
- TRT Terms: Coarse aggregates; Concrete; Curves (Geometry); Development; Durability; Dynamic modulus of elasticity; Evaluation; Freeze thaw durability; Freeze thaw tests; Length; Quality control; Strain gages; Temperature; Time; Volume changes
- Uncontrolled Terms: Change
- Old TRIS Terms: Deep freeze; Quality control testing; Whittemore strain gage
- Subject Areas: Geotechnology; Highways; Materials;
Filing Info
- Accession Number: 00217433
- Record Type: Publication
- Files: TRIS, ATRI
- Created Date: Nov 7 1994 12:00AM