TESTS OF CONCRETE ADMIXTURES

A CONTINUING INVESTIGATION WAS INITIATED 10 YEARS AGO TO SECURE FACTUAL INFORMATION ON VARIOUS CLASSES OF ADMIXTURES AND TO CHECK MANUFACTURERS' ADVERTISING CLAIMS. ADMIXTURES, PRINCIPALLY AIR-ENTRAINING, PROPOSED FOR USE IN READY-MIXED CONCRETE, WERE SUBJECTED TO A SUFFICIENT NUMBER OF TESTS TO INDICATE THEIR AIR-ENTRAINING CAPACITIES, EFFECTS ON WATER REQUIREMENT AND STRENGTH AND, IN A FEW CASES, ON RESISTANCE OF CONCRETE TO FREEZING AND THAWING. THE DATA SHOWS THAT SELECTION OF AN AIR-ENTRAINING ADMIXTURE MUST BE BASED ON ECONOMIC CONSIDERATIONS AS WELL AS ON THE ADMIXTURES EFFECT ON CONCRETE PROPERTIES. MOST OF THE MATERIALS TESTED PERFORMED SATISFACTORILY AS AIR-ENTRAINING AGENTS. HOWEVER, IN A FEW CASES AIR-ENTRAINMENT COULD BE ACCOMPLISHED WITH LITTLE OR NO REDUCTION IN STRENGTH OF THE CONCRETE OF MEDIUM RICHNESS USED IN THE TESTS. EXTRAVAGANT ADVERTISING CLAIMS OF ADMIXTURES' BENEFITS SHOULD BE VIEWED WITH RESERVE. PARTICULARLY WHERE IMPROVED STRENGTH IS CLAIMED, THE DEGREE OF IMPROVEMENT MUST BE DETERMINED FOR THE PARTICULAR CONCRETE INGREDIENTS TO BE EMPLOYED AND THEN THE COST OF THE ADMIXTURE WEIGHED AGAINST THE COST OF ACCOMPLISHING THE SAME END BY OTHER MEANS SUCH AS INCREASING CEMENT CONTENT.

  • Supplemental Notes:
    • No 2, 19 Pp, 2 FIG, 2 TAB
  • Authors:
    • Bloem, D L
  • Publication Date: 1955-12

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  • Accession Number: 00212695
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 1 1994 12:00AM