THE CRAZING OF CONCRETE

A REVIEW IS MADE OF PREVIOUS WORK ON THE CRAZING OF CONCRETE AND A SUMMARY IS GIVEN OF THE MAIN RECOMMENDATIONS IN THE LITERATURE FOR REDUCING CRAZING. THIS IS FOLLOWED BY A REPORT ON THE TESTING WHICH HAS BEEN IN PROGRESS FOR 18 MONTHS OF 66 CONCRETE COLUMNS ERECTED ON AN EXPOSURE AREA AT WEXHAM SPRINGS. MOST OF THE COLUMNS CRAZED SOON AFTER CONSTRUCTION, BUT THIS CRAZING IS NOT ALWAYS APPARENT UNLESS TRACERS ARE EMPLOYED. ON MOST OF THE COLUMNS CAST WITH BIRCH PLY LINERS IN THE FORMWORK IT IS NOT POSSIBLE TO DETECT CRAZING SOLELY BY UNAIDED VISUAL INSPECTION, WHEREAS ON MOST OF THE COLUMNS CAST WITH SEALED PLY LINERS THE CRAZING IS READILY DETECTABLE. COLUMNS MADE WITH MIXES HAVING AN AGGREGATE/CEMENT RATIO OF 6 SUFFERED LESS SEVERE CRAZING THAN THOSE WITH AN AGGREGATE/CEMENT RATIO OF 3.5. A SILICONE WATER-REPELLENT FOR USE WITH NEW CONCRETE WAS THE MOST EFFECTIVE TREATMENT FOR MAINTAINING THE COLOR OF THE CONCRETE, BUT THE POSSIBLE LONG-TERM EFFECTS OF THE TREATMENT ARE NOT KNOWN.

  • Supplemental Notes:
    • Contract DOT-HS-319-3-615 Rept No 42.480 4 APP
  • Corporate Authors:

    Cement and Concrete Association

    52 Grosvenor Gardens
    London SW1W 0AQ,   England 
  • Authors:
    • Roberts, J J
  • Publication Date: 1973-5

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 16 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00214299
  • Record Type: Publication
  • Report/Paper Numbers: Tech Rept
  • Files: TRIS
  • Created Date: Apr 11 1974 12:00AM