SILICONES AS ADMIXTURES FOR CONCRETE

RECENT RESULTS HAVE SHOWN THAT GIVEN AMOUNTS OF A CERTAIN SILICONE AS AN ADMIXTURE FOR CONCRETE WERE EFFECTIVE IN PREVENTING SCALING CAUSED BY DE-ICING AGENTS AND ALSO INCREASED THE COMPRESSIVE STRENGTH OF THE CONCRETE BUT CAUSED A MARKED RETARDATION IN THE SETTING OF THE CONCRETE. TESTS WERE MADE ON AIR-INTRAINED CONCRETE PREPARED WITH VARYING AMOUNTS OF 8 DIFFERENT SILICONE SOLUTIONS TO DETERMINE IF OTHER SILICONES USED AS ADMIXTURES WOULD GIVE SIMILAR RESULTS. THE RESULTS OF THE TESTS WARRANT THE FOLLOWING CONCLUSIONS' /1/ WHEN USED AS ADMIXTURES IN CERTAIN AMOUNTS, SOLUTIONS OF SODIUM METHYLSILICONATES INCREASED THE COMPRESSIVE STRENGTH AND DURABILITY OF CONCRETE, /2/ THE ALKYL SILANE ESTERS AND THE SILICONE RESIN EMULSION TYPES OF SILICONES IN MOST CASES EITHER HAD NO EFFECT OR WERE DETRIMENTAL TO THE COMPRESSIVE STRENGTH AND DURABILITY OF CONCRETE, /3/ THERE APPEARS TO BE A CRITICAL AMOUNT OF SILICONE ADMIXTURE NEEDED TO OBTAIN MAXIMUM COMPRESSIVE STRENGTH OR DURABILITY OF THE CONCRETE, THIS AMOUNT VARIES WITH THE PROPERTIES OF THE SILICONES, /4/ IN MOST CASES, SILICONES RETARDED THE SETTING TIME OF THE CONCRETE. IN THE MAJORITY OF CASES, WHEN THE SILICONES WERE USED IN AMOUNTS NEEDED TO OBTAIN MAXIMUM STRENGTH OR DURABILITY OF CONCRETE, THE RETARDATION OF THE SET WAS GREATER THAN CAN BE TOLERATED FOR NORMAL CONSTRUCTION PURPOSES, AND /5/ THE USE OF SILICONES AS ADMIXTURES HAD NO APPRECIABLE EFFECT ON THE WATER REQUIRED FOR A GIVEN SLUMP OR ON THE AIR CONTENT OF THE CONCRETE. REFERENCES' RESISTANCE OF CONCRETE SURFACES TO SCALING BY DE-ICING AGENTS, W.E. GRIEB, G. WERNER, AND D.O. WOOLF, PUBLIC ROADS, 32'3, AUGUST 1962. WATER-REDUCING RETARDERS FOR CONCRETE, W.E. GRIEB, G. WERNER, AND D.O. WOOLF, PUBLIC ROADS, 3'6, FEBRUARY 1961.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1963/18/18-001.pdf
• Supplemental Notes:
  • 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:
  • Grieb, William E
• Publication Date: 1963

Media Info

• Media Type: Print
• Features: Figures; Tables;
• Pagination: pp 1-12
• Monograph Title: Freezing and thawing of concrete and use of silicones
• Serial:
  • Highway Research Record
  • Issue Number: 18
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Admixtures; Air entrained concrete; Compressive strength; Concrete; Concrete curing; Deicers (Equipment); Durability; Prevention; Silicones; Sodium compounds
• Uncontrolled Terms: Deicers; Scaling
• Old TRIS Terms: Retarding
• Subject Areas: Highways; Materials; Security and Emergencies; Vehicles and Equipment;

Filing Info

• Accession Number: 00211946
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Nov 7 1994 12:00AM