EFFECTS OF MIXING SEQUENCE ON MORTAR CONSISTENCIES WHEN USING WATER-REDUCING AGENTS

THE SEQUENCE OF ADDING WATER-REDUCING AND SET-RETARDING AGENTS TO CEMENT MORTARS SHOWED SIGNIFICANT EFFECTS ON INITIAL FLOWS, FLOW LOSS RATES, AND POSSIBLE WATER REDUCTION AMOUNTS IN TWO SERIES OF TESTS. ADDITION OF POWDERED CALCIUM LIGNOSULPHONATE TO CONTROL MORTARS SEVERAL HOURS AFTER MIXING WERE FOUND TO INCREASE PERCENT FLOWS WITHOUT GREATLY AFFECTING SETTING TIMES. SUCH ADDITIONS COULD BE USED TO RESTORE THE SLUMP OF CONCRETE WHICH HAS STARTED TO STIFFEN IN TRUCK MIXERS. THIS TECHNIQUE WOULD BE PREFERABLE TO ADDING MORE WATER TO A MIX.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/sr/sr90/90-004.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
• Corporate Authors:

  Highway Research Board (HRB)

  Washington, DC   
• Authors:
  • BRUERE, G M
• Publication Date: 1966

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 26-35
• Monograph Title: Symposium on structure of Portland cement paste and concrete
• Serial:
  • Highway Research Board Special Report
  • Issue Number: 90
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Calcium; Cement mortars; Concrete; Concrete tests; Consistency; Flow control (Air traffic control); Lignosulfonate; Mixing; Moisture content; Rehabilitation; Retarders (Chemistry); Sequencing; Sets; Time; Water reducing agents
• Old TRIS Terms: Calcium lignosulphonate; Concrete consistency; Flow control; Mixing time; Renovating; Sequences
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00212293
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Nov 18 1994 12:00AM