AIR-ENTRAINED CONCRETES: A SURVEY OF FACTORS AFFECTING AIR CONTENT AND A STUDY OF CONCRETE WORKABILITY

AIR-ENTRAINED CONCRETES ARE USED EXTENSIVELY IN MODERN ROAD CONSTRUCTION AS THEY ARE ABLE TO RESIST DAMAGE BY FROST AND BY THE USE OF DE-ICING SALTS. VARIATIONS IN THE AMOUNT OF ENTRAINED AIR LEAD TO CHANGES IN CONCRETE WORKABILITY AND TO LOSS OF CONCRETE STRENGTH OR DURABILITY DEPENDING UPON WHETHER THERE IS AN EXCESS OR DEFICIENCY OF ENTRAINED AIR. A SURVEY OF THE LITERATURE WAS MADE IN ORDER TO IDENTIFY THE FACTORS AFFECTING THE YIELD OF ENTRAINED AIR FROM A GIVEN AMOUNT OF ADMIXTURE; SUGGESTIONS ARE MADE FOR LIMITING THE INFLUENCE OF THE MORE IMPORTANT FACTORS ON SITE. THE EFFECT OF ENTRAINED AIR ON CONCRETE STRENGTH IS ALSO DESCRIBED. THE EFFECT OF ENTRAINED AIR ON THE WORKABILITY OF VARIOUS CONCRETES WAS JUDGED BY THE COMPACTING FACTOR TEST AND THE VEBE TEST WHICH HAS RECENTLY BECOME A BRITISH STANDARD TEST. THESE WORKABILITY STUDIES SHOWED THAT THE RELATION BETWEEN COMPACTING FACTOR AND VEBE VALUE DEPENDS MARKEDLY UPON THE AGGREGATE USED IN THE CONCRETE. ADDITIONAL DATA ARE THEREFORE PRESENTED TO SHOW THE DEPENDENCE OF THE RELATIONS BETWEEN THESE WORKABILITY MEASUREMENTS ON THE SHAPE AND SURFACE TEXTURE OF THE AGGREGATES. /RRL(A)/

  • Supplemental Notes:
    • Rll Report LR 363, 37 PP, 15 FIG, 5 TAB, 4 PHOT, 31 REF
  • Corporate Authors:

    Road Research Laboratory /UK

    ,    
  • Authors:
    • CORNELIUS, D F
  • Publication Date: 1970

Subject/Index Terms

Filing Info

  • Accession Number: 00213132
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Aug 15 1971 12:00AM