Influence of a fine glass powder on cement hydration

Comparison to fly ash and modeling the degree of hydration

Nathan Schwarz, Narayanan Neithalath

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

This paper reports the results of an investigation carried out to understand the influence of a fine glass powder on cement hydration. The pozzolanicity of the glass powder and a Class F fly ash for comparison was evaluated using strength activity index over a period of time, and a rapid electrical conductivity based method. Flame emission spectroscopy and electrical conductivity tests were used to quantify the alkali release from glass powder, and gain information on the rate of alkali release. It was found that the glass powder releases only a very small fraction of sodium ions into the solution. It was observed that the glass powder modified pastes show higher non-evaporable water contents than the plain paste and fly ash modified pastes, indicating that glass powder facilitates enhancement in cement hydration. An expression has been developed for the change in non-evaporable water content as a result of enhancement in cement hydration and the hydration of the cement replacement material. The efficiency of any cement replacement material with age in the paste system can be quantified using this parameter. Based on this parameter, a 5% cement replacement with glass powder was found to be effective at the chosen water-to-cementing materials ratio (w/cm), whereas at higher replacement levels, the dilution effect dominates. A model to predict the combined degree of hydration of cement pastes incorporating more than one cementing material is outlined. The measured and predicted combined degrees of hydration agree well.

Original languageEnglish (US)
Pages (from-to)429-436
Number of pages8
JournalCement and Concrete Research
Volume38
Issue number4
DOIs
StatePublished - Apr 2008
Externally publishedYes

Fingerprint

Coal Ash
Fly ash
Hydration
Powders
Cements
Ointments
Glass
Alkalies
Water content
Cementing (shafts)
Emission spectroscopy
Dilution
Sodium
Ions
Water

Keywords

  • Alkalis (D)
  • Cement paste (D)
  • Degree of hydration (B)
  • Fly ash (D)
  • Glass powder
  • Hydration (A)
  • Non-evaporable water content

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Ceramics and Composites

Cite this

Influence of a fine glass powder on cement hydration : Comparison to fly ash and modeling the degree of hydration. / Schwarz, Nathan; Neithalath, Narayanan.

In: Cement and Concrete Research, Vol. 38, No. 4, 04.2008, p. 429-436.

Research output: Contribution to journalArticle

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