D-CRACKING STUDIES OF SOME MANITOBA AGGREGATES

A field study of concrete pavements in Manitoba in 1983 revealed a high incidence of d-cracking. Further testing revealed that the cracking was caused by aggregates which were susceptible to deterioration when the maximum size was 40 mm. Reducing the aggregate top size to a maximum of 20 mm could provide a solution to the d-cracking problem, but would result in higher costs due to the additional aggregate processing required and higher cement content required. This study was undertaken to determine whether some of these costs could be offset by substituting some of the cement with flyash. Results of testing using the ASTM c-666 method b freeze-thaw test indicated that substitution of 20% of the cement by class f flyash led to d-cracking, in spite of yielding concrete with lower slump and higher strength. A study of the effect of air entrainment on d-cracking indicated that an air content of 8.5% prevented d-cracking from occurring whereas air contents of 1.9% and 5.0% did not. For the covering abstract of the conference see IRRD 807201.

  • Corporate Authors:

    Transportation Association of Canada (TAC)

    Ottawa, Ontario  Canada 
  • Authors:
    • Domaschuk, L
    • Ganapathy, G P
    • Triffo, T
  • Publication Date: 1988

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00487552
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS, ATRI
  • Created Date: Sep 30 1989 12:00AM