A VISCOMETRIC METHOD OF MONITORING THE EFFECT OF RETARDING ADMIXTURES ON THE SETTING OF CEMENT PASTES

The effect of retarders on the rheological behaviour of fresh cement pastes has been studied, using rotational viscometry. Cement pastes subjected to continuous shear undergo reaggregation, indicated by the initial build up section of the torque-time curve. It is followed by a dormant period where the paste is at equilibrium which ends when setting starts and the final build up phase begins. The delay time and the kinetics of the final phase depend on the concentration of admixture and nature of the cement. The rates of build up in the initial and final build up sections of the torque-time curve are independent of retarder concentration but vary with the cement. The correlation between these results and those obtained with the vicat test for the initial setting time of cement paste is discussed. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00088846
• Corporate Authors:

  Pergamon Press, Incorporated

  Maxwell House, Fairview Park
  Elmsford, NY  United States  10523
• Authors:
  • Bhatty, J I
  • Banfill, PFG
• Publication Date: 1984-1

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 64-72
• Serial:
  • Cement and Concrete Research
  • Volume: 14
  • Issue Number: 1
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Admixtures; Cement paste; Chemical concentration; Measurement; Retarders (Chemistry); Retarders (Concrete); Rheology; Setting (Concrete); Shear strength; Test procedures; Time; Viscometers; Viscosity
• Uncontrolled Terms: Concentration; Setting time
• ITRD Terms: 4736: Admixture; 4767: Cement paste; 6136: Measurement; 4727: Retarder (concrete); 5442: Rheology; 4723: Setting (concrete); 5531: Shear; 5414: Time; 5936: Viscosity
• Subject Areas: Highways; Materials; Planning and Forecasting; I32: Concrete; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00389503
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Oct 30 1984 12:00AM