Yield Stress and Viscosity Equations for Mortars and Self-Consolidating Concrete

The rheological behavior of flowable concrete, such as self consolidating concrete (SCC) is closely influenced by concreting temperature and elapsed time. The variation of the plastic viscosity and yield stress with elapsed time and temperature must be accurately quantified in order to forecast the variation of workability of cement-based materials. In this paper, a convenient method to study the variation of these rheological parameters is proposed, using the mortar of the concrete. The latter is designed from the concrete mixture, taking into account the liquid and solid phases with a maximum granulometry of 315 μm. Different SCC and mortars proportioned with 2 types of high range water reducing admixtures were prepared at temperatures ranging from 10-33 °C. Test results indicate that the yield stress and plastic viscosity of the mortar mixtures vary in a linear way with elapsed time while an exponential variation of these rheological parameters is seen on SCC. In order to enhance robotization of concrete, general equations to predict variations of the yield stress and plastic viscosity with time are proposed, using corresponding mortar initial yield stress and plastic viscosity. Such equations, derived from existing models, can easily be employed to develop concrete design software. Experimental constants which are related to the paste fluidity or the aggregates proportioning can be extracted from a database created with either mortar or aggregates test results.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00088846
• Supplemental Notes:
  • Abstract reprinted with permission from Elsevier
• Authors:
  • Petit, Jean-Yves
  • Wirquin, Eric
  • Vanhove, Yannick
  • Khayat, Kamal H
• Publication Date: 2007-5

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 655-670
• Serial:
  • Cement and Concrete Research
  • Volume: 37
  • Issue Number: 5
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Cement; Cement mortars; Concrete construction; Mix design; Mortar; Proportioning; Rheological properties; Rheology; Self compacting concrete; Workability; Yield stress
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01051347
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 14 2007 11:55AM