STATISTICAL ANALYSIS OF THE COMPRESSIVE STRENGTH OF CONCRETE IN STRUCTURES

The relationship between the in-place compressive strength of concrete in structures and specified strength Fc is examined via the use of factors F1 and F2. Factor F1, the ratio of the average strength of standard 28-day-old cylinder specimens to the specified strength, is evaluated using data from 3,756 cylinder tests representing 108 concrete mixes produced in Alberta, Canada, between 1988 and 1993. Factor F2, the ratio of average in-place strength to average cylinder strength, is evaluated using core and cylinder data representing 108 concrete mixes with strengths less than 55 MPa that were studied by others. A statistical description of the compressive strength of concrete in structures is derived that accounts for the inherent randomness of Factors F1 and F2 and also the typical strength variation within a specific structure. The probability of the in-place compressive strength of concrete in a 28-day-old column being less than Fc is approximately 13 percent. It is likely that a recalibration of the load and resistance factors for the design of new structures in Canada based on these findings would yield greater factored concrete strengths than are currently in use.

• Record URL:
  http://www.concrete.org/Publications/InternationalConcreteAbstractsPortal.aspx.aspx?m=details&i=1353
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/13846872
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Bartlett, F M
  • MacGregor, J G
• Publication Date: 1996-3

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 158-168
• Serial:
  • ACI Materials Journal
  • Volume: 93
  • Issue Number: 2
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0889-325X
  • Serial URL: https://www.concrete.org/publications/acimaterialsjournal.aspx

Subject/Index Terms

• TRT Terms: Compressive strength; Concrete; Core samples; Evaluation; Load factor; Statistical analysis; Structural materials
• Uncontrolled Terms: Cylinders
• Old TRIS Terms: Cores
• Subject Areas: Data and Information Technology; Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00724422
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 13 1996 12:00AM