A STUDY OF AIR ENTRAINING AND CURING OF PORTLAND CEMENT CONCRETE

THE STANDARD METHOD OF FIELD CURING CONCRETE TEST CYLINDERS WAS COMPARED WITH TWO OTHER METHODS TO DETERMINE THE BEST PRACTICAL METHOD. CONCRETE TEST CYLINDERS WERE MADE ON TWELVE PAVEMENT PROJECTS, FIELD CURED IN THE THREE WAYS, AND TESTED FOR STRENGTH AT 7 AND 28 DAYS TO MEASURE THE EFFECTS OF THE THREE METHODS OF CURING. THE USE OF POLYETHYLENE CAPS WAS FOUND TO BE SUBSTANTIALLY MORE PRACTICAL THAN EITHER THE STANDARD METHOD OF CURING OR THE USE OF MOIST STORAGE BOXES AND EQUALLY UNIFORM OR SLIGHTLY MORE UNIFORM. THE EFFECT OF SPREADING, VIBRATING, SCREEDING AND FINISHING ON THE ENTRAINED AIR CONTENT IN PORTLAND CONCRETE WAS MEASURED. TO EVALUATE THE EFFECT ON THE ENTRAINED AIR OF THE NORMAL MANIPULATIONS CONCRETE RECEIVES, MEASUREMENTS WERE MADE TO DETERMINE THE ENTRAINED AIR CONTENT OF FRESHLY MIXED AND DEPOSITED CONCRETE, CONCRETE ON WHICH FINISHING OPERATIONS HAD BEEN COMPLETED BUT WAS STILL IN A PLASTIC STATE, AND THE AIR-VOID CONTENT OF HARDENED CONCRETE. THE AIR-VOID CONTENT OF THE HARDENED CONCRETE, AS MEASURED BY ASTM C-457, WAS ALWAYS LESS THAN THE AIR CONTENT OF THE FRESHLY MIXED AND DEPOSITED CONCRETE. /AUTHOR/

  • Corporate Authors:

    Ohio Department of Highways

    Columbus, OH  United States  43210
  • Authors:
    • Williams, F M
    • Trefny, A
    • Jewell, W C
  • Publication Date: 1968-12-16

Subject/Index Terms

Filing Info

  • Accession Number: 00213371
  • Record Type: Publication
  • Report/Paper Numbers: 29 pp
  • Files: TRIS
  • Created Date: Jul 22 1994 12:00AM