BASIC CONSIDERATIONS PERTAINING TO FREEZING AND THAWING TESTS

QUESTIONS ABOUT CURRENT TEST METHODS ARE RAISED AND AN ALTERNATIVE TEST SUGGESTED. PREPARATORY TO THIS, KNOWLEDGE ABOUT THE MECHANISMS OF FROST ACTION IN HARDENED PASTE AND IN ROCK IS SUMMARIZED. EMPHASIS IS PLACED ON CONCEPTS OF CRITICAL THICKNESS AND CRITICAL SATURATION, AND THE ROLES OF AIR BUBBLES IN PASTE AND MACROPORES IN ABSORPTIVE ROCK. RAPID FREEZING IN THE LABORATORY MAY DESTROY CONCRETE THAT IS IMMUNE TO FROST UNDER NATURAL CONDITIONS. IN THE LABORATORY, TOO, IMPORTANT EFFECTS OF SEASONAL DRYING ARE NOT TAKEN INTO ACCOUNT. A NEW PROCEDURE IS PROPOSED THAT TAKES CATEGORY OF FIELD EXPOSURE INTO ACCOUNT AND USES THE PERIOD OF IMMUNITY TO FROST ATTACK AS THE PRIMARY MEASURE OF FROST RESISTANCE. /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 hardening; Freeze thaw tests; Frost action; Pastes; Rocks; Test procedures
• Uncontrolled Terms: Hardened concrete
• Old TRIS Terms: Frost action effects
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00213507
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 58
• Files: TRIS
• Created Date: May 25 1970 12:00AM