The author describes the use of a computer program which designs concrete mixes in accordance with the BRE/TRRL publication (Road Note no 4 Design of Concrete Mixes). This program (MIX) was developed by the Directorate of Civil Engineering Development, PSA. It will design to either compressive or indirect tensile strength requirements, and design criteria such as minimum cement content. Margin and percentage defective rate may be varied to suit the various specifications. Other parameters that may be specified include cement type, workability, degree of exposure and air entrainment. Default values are inserted if actual values are not given. A simplified input arrangement is used. MIX will then give a design for a trial mix usually without the fine aggregate content. MIX prints the appropriate limits based on Road Note 4 and the program is re-run with a suitable value. A trial mix is then made and cubes tested at 7 and 28 days. If the strength varies considerably from the target, the program is re-run incorporating the mean strength to produce an improved mix design. Alternatively a program may be used to give the most economical mix when strengths from quality control tests can be fed back to the system. /TRRL/

  • Availability:
  • Corporate Authors:

    Department of the Environment

    Room 1640 Lunar House, 40 Wellesley Road
    Croydon CR9 2EL,   England 
  • Authors:
    • Affleck, M J
  • Publication Date: 1976-9


  • English

Media Info

  • Features: References; Tables;
  • Pagination: p. 20-21
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00149037
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0 11 7244 21
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Jun 17 1977 12:00AM