An interlaboratory test program was conducted to determine the effect of selected variables on the measured compressive strength of high-strength concrete. Based on the data developed, the following conclusions and recommendations are presented: (1) The current requirements for test platens (spherical bearing blocks) are inadequate for concrete with compressive strength in excess of 10,000 psi (70 MPa). Some test platen designs that meet current requirements result in nonuniform load transfer from the test machine to the test cylinder. This nonuniform load transfer can result in a reduction of measured compressive strength of more than 10 percent at a concrete strength of 18,000 psi (124 MPa). (2) Plastic single-use molds are suitable for testing high-strength. (3) High-strength concrete compressive strength test specimens can be adequately cured in a moist room meeting the relevant requirements for such curing. (4) When appropriate capping techniques are used -- in particular thin caps -- it appears that certain capping materials may be suitable for testing high-strength concrete; however, selection of suitable capping compounds cannot be based solely on compressive strength of the capping compound. (5) On average, 4 x 8 inch (100 x 200 mm) cylinders will have measured compressive strengths approximately 2 percent higher than 6 x 12 inch (150 x 300 mm) cylinders when testing high-strength concrete.


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 67-76
  • Serial:
    • Concrete International
    • Volume: 21
    • Issue Number: 8
    • Publisher: American Concrete Institute (ACI)
    • ISSN: 0162-4075

Subject/Index Terms

Filing Info

  • Accession Number: 00769239
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 2 1999 12:00AM