RESISTANCE OF CONCRETE TO FROST AT EARLY AGES

FREEZING EFFECTS IN SET CONCRETE ARE DISCUSSED IN TERMS OF TWO MODELS AND THREE PRESSURE PRODUCING MECHANISMS WHICH CAN BE COMBINED ACCORDING TO DIFFERENT THEORIES. THE MODELS ARE: (1) CLOSED VESSEL HAVING IMPERMEABLE WALLS, AND (2) A CLOSED VESSEL HAVING PERMEABLE WALLS. PRESSURE PRODUCING MECHANISMS ARE: (1) DISPLACEMENT OF WATER FROM FREEZING SITE (HYDRAULIC PRESSURE); (2) MOVEMENT OF WATER TO FREEZING SITE PRODUCING OSMOTIC PRESSURE AND MICROSCOPIC SEGREGATION OF ICE; AND (3) MOVEMENT OF WATER TO THE FREEZING SITE, PRODUCING MICROSCOPIC SEGREGATION OF ICE. THEORIES BASED ON MODEL 2 AND MECHANISMS 1 AND 2 SEEM TO ACCOUNT FOR ALL PHENOMENA IN MATURE CONCRETE THAT IS NOT TOO PERMEABLE. /PCA/

• Authors:
  • Powers, T C
• Publication Date: 0

Media Info

• Serial:
  • Portland Cement Assoc R & D Lab Bull
  • Issue Number: 0

Subject/Index Terms

• TRT Terms: Concrete; Freezing; Frost action
• Uncontrolled Terms: Model tests
• Old TRIS Terms: Frost action effects
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213520
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 71
• Files: TRIS
• Created Date: May 25 1970 12:00AM