THEORY OF VOLUME CHANGES IN HARDENED PORTLAND-CEMENT PASTE DURING FREEZING

NEW EXPERIMENTAL DATA ARE PRESENTED ON THE FREEZING OF HARDENED PORTLAND-CEMENT PASTES WITH AND WITHOUT ENTRAINED AIR. THEY ARE EXPLAINED IN TERMS OF TWO MECHANISMS: (1) THE GENERATION OF HYDRAULIC PRESSURE AS WATER FREEZES IN CAPILLARY CAVITIES AND (2) THE GROWTH OF THE BODIES OF ICE IN THE CAPILLARY CAVITIES OR AIR VOIDS BY DIFFUSION OF WATER FROM THE GEL. AIR VOIDS LIMIT THE HYDRAULIC PRESSURE AND SHORTEN THE PERIOD DURING WHICH THE ICE IN THE CAVITIES CAN INCREASE. THE CLOSER THE AIR VOIDS ARE TO EACH OTHER THE MORE EFFECTIVE THEY ARE IN CONTROLLING EITHER MECHANISM. /AUTHOR/

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/32/32-019.pdf
• Supplemental Notes:
  • Vol 32, pp 285-297, 7 FIG, 6 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.
• Authors:
  • Powers, T C
  • Helmuth, R A
• Publication Date: 1953

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Thirty-Second Annual Meeting of the Highway Research Board, Washington, D.C., January 13-16, 1953
• Serial:
  • Highway Research Board Proceedings
  • Volume: 32
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Air entrainment; Air voids; Freezing; Gels; Hardness; Hydraulics; Pastes; Portland cement; Pressure; Volume changes; Water; Water pressure
• Old TRIS Terms: Air voids content
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213954
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Aug 15 1971 12:00AM