EFFECT IN CONCRETE OF PELLET AND FLAKE FORMS OF CALCIUM CHLORIDE

THIS PAPER COVERS THE EFFECT OF BOTH THE PELLET AND FLAKE FORMS OF CALCIUM CHLORIDE AS ADMIXTURES ON THE FOLLOWING PROPERTIES OF PORTLAND-CEMENT CONCRETE (WITH AND WITHOUT AN AIR-ENTRAINING ADMIXTURE): (1) COMPRESSIVE STRENGTH AT 1, 3, 7, 28, AND 90 DAYS, (2) MODULUS OF RUPTURE AT THE AGES LISTED, (3) MODULUS OF ELASTICITY (SONIC) AT THE AGES LISTED, (4) ENTRAINED-AIR CONTENT OF FRESH CONCRETE AS A MEASURE OF CONSISTENCY. IN ADDITION, A SHORT INVESTIGATION WAS MADE ON THE RELATIVE EFFECTS OF WATER AND MOIST CURING. INCREASES IN COMPRESSIVE STRENGTH RESULTED FROM THE USE OF CALCIUM CHLORIDE, IN EITHER FLAKE OR PELLET FORM, AS AN ADMIXTURE. WHEN USED IN ORDINARY CONCRETE, THE FLAKE FORM WAS MORE BENEFICIAL AT AGES OF 28 AND 90 DAYS THAN THE PELLET FORM. WHEN USED IN AIR-ENTRAINED CONCRETE, THE PELLET FORM WAS MORE BENEFICIAL. ALTHOUGH THE MODULI OF RUPTURE OF ORDINARY CONCRETES AT AGES OF ONE TO SEVEN DAYS WERE INCREASED DUE TO THE USE OF CALCIUM CHLORIDE AS AN ADMIXTURE, THE MODULI OF RUPTURE OF CONCRETES 28 AND 90 DAYS OLD WERE, IN GENERAL, REDUCED BY THE ADDITION OF FLAKE CHLORIDE, NEGLIGIBLE CHANGES OR LESSER REDUCTIONS WERE CAUSED BY THE ADDITION OF PELLET CHLORIDE. SIGNIFICANT DECREASES IN MODULUS OF RUPTURE OF AIR-ENTRAINED CONCRETES 28 AND 90 DAYS OLD RESULTED FROM THE USE OF SOME AMOUNTS OF FLAKE CHLORIDE, NO SIGNIFICANT CHANGES IN MODULUS RESULTED WHEN THE PELLET FORM WAS USED. THE MODULI OF ELASTICITY (SONIC) OF ORDINARY CONCRETES AT AGES OF ONE TO SEVEN DAYS WERE INCREASED BY THE ADDITION OF EITHER FLAKE OR PELLET CALCIUM CHLORIDE TO THE MIX. THE EFFECT IN GENERAL OF BOTH FLAKE AND PELLET CHLORIDE AT 28 AND 90 DAYS WAS NOT SIGNIFICANT. AIR CONTENT OF ORDINARY CONCRETE AND AIR-ENTRAINED CONCRETE WAS GENERALLY INCREASED BY THE ADDITION OF EITHER FLAKE OR PELLET CHLORIDE TO THE MIX. THE SLUMP OF ORDINARY CONCRETE WAS INCREASED BY THE ADDITION OF CERTAIN AMOUNTS OF FLAKE CHLORIDE AND DECREASED BY THE ADDITION OF CERTAIN AMOUNTS OF PELLET CHLORIDE. OTHER AMOUNTS OF BOTH FORMS OF CHLORIDE HAD NEGLIGIBLE EFFECTS. THE SLUMP OF AIR-ENTRAINED CONCRETE WAS INCREASED BY ADDITION OF CHLORIDE, EXCEPT 4-PERCENT PELLET CHLORIDE, THIS AMOUNT CAUSED A DECREASE IN SLUMP AS COMPARED TO CONCRETE CONTAINING NO CHLORIDE. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrbbulletin/75/75.pdf
• Supplemental Notes:
  • No 75, 18 PP, 26 FIG, 6 TAB, 9 REF Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Mccall, J T
  • Claus, R J
• Publication Date: 1953

Media Info

• Media Type: Print
• Pagination: 18p
• Serial:
  • Highway Research Board Bulletin
  • Issue Number: 75
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Admixtures; Air content; Air entrained concrete; Air entraining agents; Calcium chloride; Compressive strength; Concrete; Concrete curing; Consistency; Entrained air; Modulus of elasticity; Modulus of rupture; Pellets; Polymer concrete; Portland cement concrete; Slump test
• Uncontrolled Terms: Slumps
• Old TRIS Terms: Concrete consistency; Flakes
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213263
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Apr 28 1994 12:00AM