FIELD SUBSTITUTION OF FLYASH FOR A PORTION OF CEMENT IN AIR- ENTRAINED CONCRETE

AFTER A SERIES OF LABORATORY TESTS, WISCONSIN UNDERTOOK A FIELD INVESTIGATION OF THE EFFECTS OF SUBSTITUTING FLYASH FOR A PORTION OF THE CEMENT IN AIR-ENTRAINED CONCRETE. REQUIREMENTS FOR THE CONCRETE WERE STANDARD IN ALL RESPECTS EXCEPT THAT THEY CALLED FOR USING 20 LB. OF FLYASH WITH EACH 75 LB. OF CEMENT AND AIR CONTENT OF 2.5 TO 6 PERCENT. TEST SECTIONS WERE PLACED WITH THE STANDARD PAVING MIXTURE USING A NOMINAL 5.4 SACKS OF AIR-ENTRAINING CEMENT PER CUBIC YARD, THE MIXTURE WITH THE FLYASH SUBSTITUION, AND THE LATTER MIXTURE WITH AIR-ENTRAINING AGENT ADDED TO RESTORE THE AIR CONTENT TO NEARLY THAT OF THE STANDARD. TESTS INCLUDED STRENGTH AND DURABILITY TESTS ON FIELD AND LABORATORY MIXED CONCRETE, AND STRENGTH TESTS ON CORES TAKEN FROM THE PAVEMENT WHEN IT WAS 39 MONTHS OLD. THE RESULTS SUBSTANTIATED THOSE OBTAINED IN THE EARLIER LABORATORY TESTS AND SHOWED THAT SUBSTITUTING FLYASH FOR ABOUT 20 PERCENT OF THE CEMENT INCREASED THE STRENGTH OF THE CONCRETE AT AGES BEYOND 28 DAYS BUT REDUCED THE AIR CONTENT AND THE RESISTANCE TO FREEZING AND THAWING. RESTORING THE AIR CONTENT OF THE FLYASH CONCRETE REDUCED THE STRENGTH BUT RESTORED THE RESISTANCE TO FREEZING AND THAWING TO A LARGE EXTENT. STRENGTH TESTS ON THE CORES SHOWED THAT IN THE PAVEMENT BOTH THE CONCRETE WITH THE FLYASH SUBSTITUTION AND REDUCED AIR CONTENT AND THE FLYASH CONCRETE WITH AIR CONTENT RESTORED WERE SUBSTANTIALLY STRONGER THAN THE STANDARD CONCRETE. INSPECTION OF THE PAVEMENT AT THE TIME THE CORES WERE TAKEN SHOWED NO ADVERSE EFFECTS ON ANY OF THE CONCRETES AFTER THREE YEARS OF SERVICE. /AUTHOR/

  • Supplemental Notes:
    • Vol 33, pp 258-264, 7 FIG, 7 TAB
  • Authors:
    • Larson, G H
  • Publication Date: 1954

Media Info

  • Monograph Title: Proceedings of the Thirty-Third Annual Meeting of the Highway Research Board, Washington, D.C., January 12-15, 1954
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00213966
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: May 22 1972 12:00AM