WATER-REDUCING RETARDERS FOR CONCRETE--CHEMICAL AND SPECTRAL ANALYSES

THE PURCHASER OF A CONCRETE RETARDER IS PRIMARILY INTERESTED IN THE PERFORMANCE OF THE MATERIAL AND HIS INITIAL EVALUATION IS BASED ON TESTS TO SHOW THE EFFECT OF THE MATERIAL ON CONCRETE. HE MUST, HOWEVER, ASSURE HIMSELF THAT THE COMPOSITION OF EACH LOT PURCHASED HAS NOT BEEN MATERIALLY ALTERED SUBSEQUENT TO HIS INITIAL ACCEPTANCE OF THE PRODUCT. TO EXPLORE THE BEST MEANS OF DOING THIS, CHEMICAL AS WELL AS ULTRAVIOLET AND INFRARED SPECTRAL ANALYSES WERE MADE ON 25 COMMERCIAL RETARDERS. THE RESULTS ARE REPORTED IN THIS ARTICLE. THESE MATERIALS WERE FOUND TO BE OF THREE GENERAL TYPES: LIGNOSULFONATES, SALTS OF HYDROXY-CARBOXYLIC ACIDS, AND CARBOHYDRATES. IT WAS FOUND THAT INFRARED SPECTRAL ANALYSIS OFFERS THE MOST PROMISING AND RAPID MEANS OF CLEARLY IDENTIFYING SUCH PRODUCTS. ULTRAVIOLET TECHNIQUES WERE ALSO FOUND TO BE OF VALUE IN IDENTIFYING LIGNOSULFONATE RETARDERS AND IN ESTABLISHING THE CONCENTRATION OF THE MAJOR ACTIVE INGREDIENT. CONVENTIONAL CHEMICAL PROCEDURES, ALTHOUGH USEFUL, WERE TEDIOUS AND TIME- CONSUMING, AND OFTEN YIELDED EMPIRICAL OR DOUBTFUL RESULTS FOR CERTAIN MAJOR ORGANIC CONSTITUENTS. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrbbulletin/310/310-002.pdf
• Supplemental Notes:
  • No 310, pp 33-55, 14 FIG, 6 TAB, 10 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:
  • Halstead, Woodrow J
  • Chaiken, Bernard
• Conference:
  • 40th Annual Meeting of the Highway Research Board
  • Location: Washington DC, United States
  • Date: 1961-1-9 to 1961-1-13
• Publication Date: 1962

Media Info

• Media Type: Digital/other
• Monograph Title: Tests and investigations of retarding admixtures for concrete
• Serial:
  • Highway Research Board Bulletin
  • Issue Number: 310
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Admixtures; Carbohydrates; Chemical analysis; Concrete; Hydroxides; Infrared spectroscopy; Retarders (Chemistry); Ultraviolet spectroscopy; Water reducing agents
• Uncontrolled Terms: Carboxylic acids
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00212641
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Aug 5 1994 12:00AM