Characterizing cement pastes incorporating two high silica fine materials using electrical impedance

Nathan Schwarz, Matthew DuBois, Narayanan Neithalath

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

1 Scopus citations

Abstract

Synopsis: This paper investigates the influence of two silica rich fine materials - a fine glass powder used as an inert filler, and nano-silica used as a supplementary cementing material - on the behavior of cement pastes at early ages using electrical impedance. The effective electrical conductivities of the pastes as a function of time, and their derivatives are used to identify the different stages in the microstructure development of the pastes. The incorporation of fine glass powder in the cement pastes in the proportions used in this study does not significantly influence the setting and hardening behavior of the pastes. The increased normalized conductivity of glass powder modified pastes at very early ages even when the local pore volume is reduced by the addition of glass powder filler, and the near equivalence with plain pastes at relatively later times is explained using the pore connectivity factor. The nano-silica modified pastes show significantly different conductivity-time response. It is seen that the setting and hardening phases of cement hydration are accelerated by the presence of nano-silica in the mixture. The nano-silica modified pastes exhibit a significant degree of matrix densification at early ages as could be observed from their conductivity responses as well as compressive strength results.

Original languageEnglish (US)
Title of host publication9th CanMET/ACI Fly Ash Conference
EditorsV.M. Malhotra
PublisherAmerican Concrete Institute
Pages253-266
Number of pages14
ISBN (Electronic)9780870312410
StatePublished - Apr 1 2007
Externally publishedYes
Event9th CANMET/ACI International Conference on Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete - Warsaw, Poland
Duration: May 20 2007May 25 2007

Publication series

NameAmerican Concrete Institute, ACI Special Publication
VolumeSP-242
ISSN (Print)0193-2527

Conference

Conference9th CANMET/ACI International Conference on Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete
Country/TerritoryPoland
CityWarsaw
Period5/20/075/25/07

Keywords

  • Capillary porosity
  • Cement paste
  • Electrical conductivity
  • Electrical impedance
  • Glass powder
  • Inert filler
  • Nano-silica
  • Pore connectivity

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Characterizing cement pastes incorporating two high silica fine materials using electrical impedance'. Together they form a unique fingerprint.

Cite this