INFLUENCE OF THE DEGREE OF SATURATION OF COARSE AGGREGATE ON THE RESISTANCE OF STRUCTURAL LIGHTWEIGHT CONCRETE TO FREEZING AND THAWING

SIX SELECTED COMMERCIALLY PRODUCED AND 7 TTI KILN- PRODUCED LIGHTWEIGHT COARSE AGGREGATES WERE USED IN 69 BATCHES OF LIGHTWEIGHT CONCRETE. THESE BATCHES OF CONCRETE, CONTAINING THESE COARSE AGGREGATES, AIR ENTRAINMENT, TYPE 1 CEMENT, AND NATURAL SAND, WERE MIXED AND SUBJECTED TO FREEZING AND THAWING IN ACCORDANCE WITH ASTM C290. ABSORPTION CHARACTERISTICS AND POROSITY VALUES WERE DETERMINED FOR EACH OF THE AGGREGATES. VARIOUS DEGREES OF SATURATION OF THE COARSE AGGREGATE AT THE TIME OF MIXING WERE OBTAINED BY IMMERSING THE AGGREGATES IN WATER FOR PERIODS RANGING UP TO 180 DAYS PRIOR TO MIXING. THE RESULTS INDICATE A FAILURE ENVELOPE EXISTS BETWEEN THE NUMBER OF FREEZE-THAW CYCLES TO FAILURE AND THE DEGREE OF SATURATION OF THE COARSE AGGREGATE. THE "CRITICAL" DEGREE OF SATURATION BY VOLUME WAS FOUND TO BE 0.25 (OR 25 PERCENT) BELOW WHICH THE CONCRETE WILL GENERALLY WITHSTAND 300 CYCLES OF FREEZE-THAW. IT WAS ALSO DETERMINED THAT SOME OF THESE AGGREGATES REACHED THIS INITIAL SATURATION AFTER ONLY 30 MINUTES OF IMMERSION, WHILE OTHER AGGREGATES HAD TO BE IMMERSED FOR SEVERAL DAYS BEFORE BECOMING CRITICALLY SATURATED. THE PRACTICAL IMPLICATIONS OF THE TEST RESULTS ARE DISCUSSED. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1970/328/328-001.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Performance of Concrete--Physical Aspects. 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:
  • Buth, Eugene
  • Ledbetter, W B
• Discussers:
  • Chamberlin, W P
• Publication Date: 1970

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; References; Tables;
• Pagination: pp 1-16
• Monograph Title: Concrete durability, cement paste, aggregates and sealing compounds
• Serial:
  • Highway Research Record
  • Issue Number: 328
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Aggregates; Coarse aggregates; Concrete; Concrete curing; Drying; Durability; Freeze thaw tests; Freezing; Lightweight aggregates; Lightweight concrete; Percent saturation; Structural materials; Thaw; Void ratios
• Old TRIS Terms: Aggregate drying; Resistance; Void
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00213850
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Feb 8 1971 12:00AM