BASIC MIX METHOD: SELECTION OF PROPORTIONS FOR MEDIUM STRENGTH CONCRETES

THIS METHOD RELIES ON MAKING A FIRST TRIAL MIX, BASED ON THE CLASSIFICATIONS AND CHARACTERISTICS OF THE MATERIALS TO BE USED, AND THEN APPLYING CORRECTIONS (IF NECESSARY) TO OBTAIN THE BASIC MIX. A MIX CHART IS THEN PREPARED WHICH IS PROVED AT TWO OR MORE LEVELS OF CEMENT CONTENT WITHIN THE LIMITING RANGE. A MIX IS THEN CHOSEN TO SATISFY SPECIFICATION REQUIREMENTS. FIVE COMPREHENSIVE TABLES ARE GIVEN AS A GUIDE TO THE PREPARATION OF THE FIRST TRIAL MIX FROM KNOWLEDGE OF THE MAXIMUM SIZE OF AGGREGATE, TARGET WORKABILITY, SHAPE OF COARSE AGGREGATE, GRADING ZONE OF THE FINE AGGREGATE AND THE GRADING OF THE COARSE AGGREGATE. TWO EXAMPLES GIVE DETAILS OF THE METHOD INCLUDING USE OF THE TABLES, SPECIMEN MIX CHARTS AND METHODS OF APPLYING CORRECTIONS FOR THE SPECIFIC GRAVITY OF THE COARSE AGGREGATE MOISTURE CONTENT OF THE AGGREGATES AND FAULTS IN WORKABILITY AND COHESION. APPENDIX 1 GIVES DETAILS OF THE ASSESSMENT OF AGGREGATES, INCLUDING GRADING AND SHAPE OF COARSE AGGREGATE, ZONES OF FINE AGGREGATE, SPECIFIC GRAVITY OF COARSE AGGREGATE AND MOISTURE CONDITION. APPENDICES 2A AND 2B DEAL WITH WORKABILITY AND COHESION AND APPROPRIATE CORRECTIONS. APPENDICES 3 AND 4 GIVE NOTES ON THE SPECIFIC GRAVITY OF CEMENTS AND THE ASSESSMENT AND PREDICTION OF THE STRENGTH OF THE CONCRETE. /TRRL/

  • Corporate Authors:

    Cement and Concrete Association

    52 Grosvenor Gardens
    London SW1W 0AQ,   England 
  • Authors:
    • Owens, P L
  • Publication Date: 1973-8

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: 19 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00083124
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: BRMCA-TR-6 R&D Rpt.
  • Files: ITRD, TRIS
  • Created Date: May 1 1975 12:00AM