Influence of clays on the rheology of cement pastes

Nathan A. Tregger*, Margaret E. Pakula, Surendra P Shah

*Corresponding author for this work

Research output: Contribution to journalArticle

106 Scopus citations

Abstract

The fresh state of concrete is becoming increasingly important in furthering the types of applications of today's construction world. Processing techniques have resulted in technologies such as self-consolidating concrete and depend on the microstructural changes that take place during and immediately after mixing and placing. These changes to the microstructure reflect the flocculation behavior between the particles in suspension. The ability to modify this behavior allows control over the balance among flowability and shape-stability of concrete. This study investigates how clay admixtures affect the microstructure of cement pastes from a rheological stand point. Shear and compressive rheology techniques are used to measure how the solids volume fraction of suspensions with different admixtures evolves with stress. Based on these relationships, the effectiveness of clays on the balance between flowability and shape-stability is measured. Results are consistent with green strength tests performed on concrete mixes derived from the cement paste mixes.

Original languageEnglish (US)
Pages (from-to)384-391
Number of pages8
JournalCement and Concrete Research
Volume40
Issue number3
DOIs
StatePublished - Mar 1 2010

Keywords

  • Cement paste
  • Clay
  • Flocculation
  • Fresh concrete
  • Rheology

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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