DEVELOPMENT OF A CONCRETE ADMIXTURE TO IMPROVE FREEZE-THAW DURABILITY

A STUDY TO DETERMINE THE EFFECT OF VARIOUS SILICONE ADMIXTURES ON THE RESISTANCE OF CONCRETE TO FREEZE-THAW CONDITIONS HAS RESULTED IN THE DEVELOPMENT OF A NEW SILICONE ADMIXTURE /DOW CORNING 777/. THE MOST IMPORTANT IMPROVEMENT WITH THE USE OF THIS ADMIXTURE IS THE INCREASE IN RESISTANCE OF CONCRETE TO THE ACTION OF FREEZING AND THAWING IN THE PRESENCE OF DEICING CHEMICALS. USING THE CONRAD RAPID-CYCLE FREEZE-THAW TEST APPARATUS, SPECIMENS WERE CONTINUOUSLY EXPOSED IN THE PRESENCE OF A 10 PERCENT SODIUM CHLORIDE SOLUTION. THE CONCRETE SPECIMENS CONTAINING THE ADMIXTURE SHOWED MORE THAN 50 PERCENT IMPROVEMENT IN DURABILITY COMPARED WITH AIR- ENTRAINED CONTROL SPECIMENS. SCALING SLAB SPECIMENS CONTINUOUSLY EXPOSED TO 2 PERCENT SODIUM CHLORIDE AND UNDERGOING ONE FREEZE-THAW CYCLE PER DAY ALSO SHOW GOOD IMPROVEMENT IN SCALING RESISTANCE. OTHER IMPROVEMENTS INCLUDE INCREASES IN COMPRESSIVE STRENGTH, FLEXURAL STRENGTH , AND BOND TO REINFORCING STEEL. ALTHOUGH THE ADMIXTURE PRODUCES EXTENDED SET TIMES IN CONCRETE, FIELD TRIALS HAVE INDICATED THAT SUCCESSFUL PLACEMENT IS EASILY ACCOMPLISHED USING STANDARD TECHNIQUES. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 13-30
  • Monograph Title: Research on aggregate, cement, concrete and epoxy bonding
  • Serial:

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Filing Info

  • Accession Number: 00211952
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Dec 12 1994 12:00AM