RETARDERS FOR CONCRETE, AND THEIR EFFECTS ON SETTING TIME AND SHRINKAGE

SIXTY-FIVE PURE CHEMICALS AND THREE PROPRITZRY RETARDERS WERE TESTED IN THE PENETRATION TEST FOR SETTING TIME AT CONCENTRATIONS AT OR AROUND 0.1 PERCENT OF THE CEMENT. THE MOST EFFECTIVE RETARDERS HAD SEVERAL, CLOSELY-GROUPED OXYGEN ATOMS IN HYDROXYL, CARBOXYL, OR CARBONYL GROUPS. SOME OF THE RETARDERS WERE USED IN THE FABRICATION OF 0.2 X 0.2 X 4-IN. BARS OF CEMENT PASTE, WHICH WERE SUBSEQUENTLY OVEN-DRIED AND THE SHRINKAGE, NON-EVAPORABLE WATER CONTENT, AND SPECIFIC SURFACE OF THE PASTE WAS DETERMINED. THE RETARDERS CAUSED A CHANGE IN THE SHRINKAGE THAT WAS PARALLELED BY A CHANGE IN THE SPECIFIC SURFACE OF THE PASTE. /AUTHOR/

• Supplemental Notes:
  • Rept No JHRP 51
• Corporate Authors:

  way Research Project

  Civil Engineering Building, Purdue University
  West Lafayette, Indiana,   United States  47907
• Authors:
  • YAMAMOTO, Y
• Publication Date: 1972-12

Media Info

• Features: Figures; References; Tables;
• Pagination: 181 p.
• Serial:
  • Purdue University/Indiana State Hwy Eng Rpt JHRP
  • Publisher: way Research Project

Subject/Index Terms

• TRT Terms: Cement additives; Cement paste; Expansive cement; Microstructure; Retarders (Concrete); Setting (Concrete); Shrinkage
• Uncontrolled Terms: Setting time
• Old TRIS Terms: Retarders
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00214267
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 22 1973 12:00AM