Skip to main content
Article
Influence of nano-sized highly purified magnesium alumino silicate clay on thixotropic behavior of fresh cement pastes
Construction and Building Materials (2014)
  • Zhuojun Quanji, Iowa State University
  • Gilson R. Lomboy, Rowan University
  • Kejin Wang, Iowa State University
Abstract
Thixotropic behavior of cementitious materials is attracting much attention due to its important applications in concrete practice, such as formwork pressure, multi-lift casting, slip form paving, pumping and segregation. This study investigates the influences of nano-sized highly purified magnesium alumino silicate clay (3 nm in diameter, called nanoclay) on thixotropic behavior, particularly, the structural rebuilding of fresh cement pastes. In this study, rheological properties (yield stress, viscosity and thixotropy) of cementitious pastes, with and without nanoclay, were measured at every 15 min after the pastes were mixed. Flow table tests were conducted, and the results were compared with those measured from the rheology tests. Statistical methods were utilized to determine the rates of changes in thixotropy with time. The results indicate that a small amount of nanoclay addition (0.5–1% by mass of cement) significantly facilitates particle re-flocculation or structural rebuilding, and effectively enhances the thixotropy of cement pastes.
Keywords
  • Nanoclay,
  • Fresh cement paste,
  • Thixotropy,
  • Structural rebuilding,
  • Nanoparticles
Publication Date
January 10, 2014
DOI
10.1016/j.conbuildmat.2014.07.050
Citation Information
Zhuojun Quanji, Gilson R. Lomboy and Kejin Wang. "Influence of nano-sized highly purified magnesium alumino silicate clay on thixotropic behavior of fresh cement pastes" Construction and Building Materials Vol. 69 Iss. 69 (2014) p. 295 - 300
Available at: http://works.bepress.com/gilson-lomboy/6/