ADVANCE CALCULATION OF THE COMPOSITION OF CONCRETE

IT IS EXPLAINED THAT, WITH THE AID OF THE INSTRUCTIONS FOR THE MIX DESIGN AND MANUFACTURE OF CONCRETE WITH SPECIFIC PROPERTIES, THE PRACTICING ENGINEER WILL BE ABLE TO DETERMINE THE FAVORABLE COMPOSITION OF THE CONCRETE FOR THE CONDITIONS EXISTING ON THE PARTICULAR SITE CONCERNED. SOME DIFFICULTIES COULD POSSIBLY ARISE ONLY IN THE DETERMINATION OF THE REQUISITE AMOUNTS OF WATER. IN THE PRESENT ARTICLE IT IS ACCORDINGLY ENDEAVORED TO GIVE THE ENGINEER BETTER GUIDANCE IN CHOOSING THE APPROPRIATE AMOUNT OF WATER. THE PROBLEM OF CALCULATING THE COMPOSITION OF CONCRETE IN ADVANCE IS REDUCED TO THE SOLVING OF A SET OF EQUATIONS WITH THREE UNKNOWNS, NAMELY, THE QUANTITIES OF WATER, CEMENT AND AGGREGATES RESPECTIVELY, AS HAS ALREADY BEEN PROPOSED BY GAEDE. GAEDE'S METHOD IS DEVELOPED IN SUCH A WAY THAT THE REQUISITE WATER, CEMENT AND AGGREGATE QUANTITIES FOR PARTICULAR CONDITIONS CAN BE DETERMINED DIRECTLY FROM DIAGRAMS. THE DIAGRAMS CAN BE USED FOR ANY GRADING CURVE OF THE AGGREGATES AND ALSO FOR THE CONSISTENCIES S (SUBSCRIPT 1 ) TO S (SUBSCRIPT 4 ). THE DIFFERENCES BETWEEN THE METHODS INDICATED IN THE INSTRUCTIONS AND GAEDE'S METHOD LIE MORE PARTICULARLY IN THE DETERMINATION OF THE REQUISITE AMOUNT OF WATER. THE RESULTS OF THE TWO PROCEDURES ARE COMPARED. THE COMPARISON SHOWS THAT THE DIFFERENCES ARE WITHIN THE ANTICIPATED RANGE OF ACCURACY AND THAT GAEDE'S METHOD IS THEREFORE DIRECTLY SUITABLE FOR APPLICATION (CF. SECTION 4). IT OFFERS THE ADVANTAGE THAT IT CAN BE USED FOR ANY COMPOSITION OF THE AGGREGATES AND THE CONCRETES HAVING A CONTENT OF VERY FINE PARTICLES EXCEEDING 350 KG/CUBIC METER REQUIRE NO SPECIAL TREATMENT. THE AMOUNTS OF WATER DETERMINED ARE THE TOTAL WATER AMOUNTS. /AUTHOR/

  • Supplemental Notes:
    • Vol 33, No 9, PP 432-435
  • Authors:
    • Kirtschig, K
  • Publication Date: 1967-9

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  • Accession Number: 00212569
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 19 1994 12:00AM