CANADIAN EXPERIENCE IN THE USE OF THE MODIFIED BOILING METHOD

This paper briefly reviews the history of accelerated-curing techniques for quality control of concrete. In a modified boiling method that has been developed by the Mines Branch, the test specimens are standard cured for 23 to 23.5 hours, then boiled for 2.5 hours, and tested for compression 1.5 hours after being boiled. The total elapsed time between molding and testing of cylinders does not exceed 28.5 hours. This method is finding increasing acceptance in Canada and has been adopted by the American Society for Testing and Materials and the Canadian Standards Association. The data from Hydo-Quebec, Acres-Bechtel, a ready-mix concrete company in Ottawa, and the University Calgary, Alberta, show significant correlations between the results of the accelerated and 28-day compressive strength tests. The original regression equation reported by the Mines Branch relating the compressive strength of accelerated-cured cylinders to that of 28-day standard-cured cylinders has been compared with the equation developed at the University of Calgary, and the two regression lines are about identical. Each testing and control authority contemplating the use of the modified boiling method is urged to develop its own correlations for predicting 28-day compressive strengths and not to rely on the correlations published by others.

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 13-18
  • Monograph Title: Recent developments in accelerated testing and maturity of concrete
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00131688
  • Record Type: Publication
  • ISBN: 0309024668
  • Files: TRIS, TRB
  • Created Date: Jun 5 1976 12:00AM