Flocculation behavior of cement pastes containing clays and fly ash

N. Tregger*, H. Knai, Surendra P Shah

*Corresponding author for this work

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

2 Scopus citations

Abstract

The fresh state of concrete is becoming increasingly important in furthering the types of applications in today's construction world. Processing techniques that have resulted in new technologies such as self-consolidating concrete depend on the microstructural changes within the cement paste during the first hours after mixing and placing. These changes to the microstructure reflect flocculation between particles in suspension. The ability to modify this behavior allows control over the balance between flowability and shape-stability of concrete. This study uses a centrifuge method to determine the relationship between local volume fraction (volume fraction of the sediment region) and compressive yield stress within cement pastes. Based on this relationship, the effectiveness that different admixtures such as clays and fly ash have on the balance between flowability and shape-stability can be measured. Results are consistent with green strength tests performed on example concrete mixes derived from the cement paste mixes.

Original languageEnglish (US)
Title of host publicationTransition from Fluid to Solid
Subtitle of host publicationRe-examining the Behavior of Concrete at Early Ages - Technical Session at the 2009 ACI Spring Conference
Pages127-138
Number of pages12
Edition259 SP
StatePublished - Nov 23 2009
EventTransition from Fluid to Solid: Re-examining the Behavior of Concrete at Early Ages - Technical Session at the 2009 ACI Spring Conference - San Antonio, TX, United States
Duration: Mar 15 2009Mar 19 2009

Other

OtherTransition from Fluid to Solid: Re-examining the Behavior of Concrete at Early Ages - Technical Session at the 2009 ACI Spring Conference
CountryUnited States
CitySan Antonio, TX
Period3/15/093/19/09

Keywords

  • Clay
  • Compressive rheology
  • Flocculation
  • Fly ash
  • Green strength
  • Volume fraction

ASJC Scopus subject areas

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

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