Improvement of fresh-state concrete through small additions of clay

Nathan Tregger*, Raissa Ferron, Mark Beacraft, Jae Hong Kim, Katherine Kuder, Surendra P. Shah

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Although clays such as metakaolin are typically incorporated into cement-based materials in order to improve hardened-state properties, recent findings at the Center for Advanced Cement-Based Materials (ACBM) have shown a large influence on the fresh-state. Furthermore, these benefits come at a much lower dosage, (-1% by mass of binder). A recent focus of ACBM has been the use of small dosages of clays in order to improve fresh-state properties such as extrudability and green strength. This paper summarizes several current projects at ACBM which demonstrate the effects of different commercial clays on relevant properties for three different scenarios: extrusion, formwork pressure of self-consolidating concrete (SCC) and slipform paving SCC. In each case, small additions of clays have shown marked improvements in the rheology of the cement composite. The use of two experimental methods to characterize the microstructural changes that occur with additions of clays is also reviewed.

Original languageEnglish (US)
Title of host publicationAdvances in the Material Science of Concrete - Session at the ACI Spring 2010 Convention
Pages51-66
Number of pages16
Edition270 SP
StatePublished - Dec 1 2010
EventACI Spring 2010 Convention - Chicago, IL, United States
Duration: Mar 21 2010Mar 25 2010

Publication series

NameAmerican Concrete Institute, ACI Special Publication
Number270 SP
ISSN (Print)0193-2527

Other

OtherACI Spring 2010 Convention
Country/TerritoryUnited States
CityChicago, IL
Period3/21/103/25/10

Keywords

  • Clay
  • Extrusion
  • Formwork pressure
  • Microstructure
  • Self-consolidating concrete (SCC)
  • Slipform paving

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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