CALCIUM CHLORIDE AS AN ADMIXTURE IN CONCRETE

TESTS WERE CONDUCTED ON ACCELERATORS OR ADMIXTURES IN CONCRETE FOR ATTAINING RAPID SET AND EARLY STRENGTH. THE EFFECT OF SUCH ADMIXTURES ON THE COMPRESSIVE STRENGTH OF CONCRETE AND MORTAR WERE STUDIED BY STRENGTH TESTS USING ADMIXTURES OF CALCIUM CHLORIDE FROM TWO DIFFERENT MANUFACTURERS AND THREE PROPRIETARY COMPOUNDS OF CALCIUM- CHLORIDE BASE. THE TESTS COVERED A WIDE RANGE OF MIXTURES, CONSISTENCIES, AND CURING CONDITIONS, AND INCLUDED STUDIES WITH FOUR DIFFERENT BRANDS OF CEMENT. MAGNESIUM CHLORIDE WAS INCLUDED IN ONE SERIES OF TESTS. PARALLEL TESTS WERE MADE ON CONCRETE AND MORTAR WITHOUT ADMIXTURES FOR COMPARISON PURPOSES. ABOUT 7500 COMPRESSION SPECIMENS WERE TESTED IN THREE SEPARATE INVESTIGATIONS. IT WAS DETERMINED THAT CALCIUM CHLORIDE AND THE ADMIXTURES CONTAINING CALCIUM CHLORIDE WHEN USED WITHIN CERTAIN LIMITING PERCENTAGES GAVE INCREASED STRENGTH TO CONCRETE. MAGNESIUM CHLORIDE CAUSED A REDUCTION IN STRENGTH EXCEPT IN SMALL PERCENTAGES, WHICH SHOWED A SLIGHT INCREASE FOR 2 AND 7-DAY TESTS. THE EFFECT OF THE CALCIUM CHLORIDE ADMIXTURES IN CONCRETE VARIED WITH THE TYPE AND QUANTITY OF ADMIXTURE. TESTS CONFIRM THE RELATION BETWEEN WATER-CEMENT RATIO AND COMPRESSIVE STRENGTH. THE EFFECT OF COMMERCIAL CALCIUM CHLORIDE ON THE STRENGTH OF CONCRETE CURED UNDER DIFFERENT MOISTURE CONDITIONS AT NORMAL TEMPERATURES WAS SLIGHTLY GREATER IN CONCRETE CURED IN THE LABORATORY THAN IN CONCRETE CURED IN WATER OR IN A MOIST ROOM. THE CEMENTS USED IN THE TESTS WERE SIMILARLY AFFECTED BY ADDITION OF CALCIUM CHLORIDE. THE EFFECT OF CALCIUM CHLORIDE IN MORTAR WAS ESSENTIALLY THE SAME AS IN CONCRETE. THE TIME OF SETTING OF THE CEMENT USED WAS SHORTENED BY EACH OF THE ADMIXTURES. IN THE USE OF CALCIUM CHLORIDE NO ADVANTAGE WAS GAINED FOR PERCENTAGES OF THE COMMERCIAL PRODUCT GREATER THAN 2 OR 3 PERCENT OF THE WEIGHT OF CEMENT. THIS AMOUNT WHEN USED IN MIXES OF ABOUT 1:5 AND IN CONSISTENCY SUITABLE FOR BUILDING CONSTRUCTION SHOWED AN INCREASE IN COMPRESSIVE STRENGTH OF FROM 100 TO 200 LB. PER SQ. IN. FOR RICHER MIXES AND DRIER CONSISTENCIES THE STRENGTH INCREASE WAS GREATER, AND FOR LEANER MIXES AND FOR WETTER CONCRETES IT WAS LESS.

  • Supplemental Notes:
    • Bulletin 13, 57 PP, 16 RIG, 15 TAB, 52 REF
  • Corporate Authors:

    Structural Materials Research Lab

    ,    
  • Authors:
    • Abrams, D A
  • Publication Date: 1924

Subject/Index Terms

Filing Info

  • Accession Number: 00212688
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 18 1994 12:00AM