Hydration in high-performance cementitious systems containing vitreous calcium aluminosilicate or silica fume

Narayanan Neithalath, Jarrod Persun, Akhter Hossain

Research output: Contribution to journalArticle

50 Scopus citations

Abstract

The influence of a relatively new high-performance cement replacement material-vitreous calcium aluminosilicate (VCAS)-on the hydration behavior in cementitious systems, and its comparison to silica fume (SF) are presented in this paper. VCAS is shown to have no cementitious qualities, but exhibits significant pozzolanicity, which has been quantified using strength activity index and electrical conductivity change. VCAS modified pastes are found to consume more water during hydration than the corresponding SF modified pastes. Based on a normalized calcium hydroxide content defined in this paper, it is seen that the pozzolanic reaction of VCAS does not happen until 7 days while that of SF occurs as early as the first day. The degrees of hydration of the modified pastes are predicted using a model that employs the change in non-evaporable water resulting from the use of these replacement materials. VCAS modified pastes show lower later age porosities as compared to the plain and SF modified pastes. However, at equal degrees of hydration, SF modified pastes show the lowest porosity.

Original languageEnglish (US)
Pages (from-to)473-481
Number of pages9
JournalCement and Concrete Research
Volume39
Issue number6
DOIs
StatePublished - Jun 1 2009
Externally publishedYes

Keywords

  • Degree of hydration (B)
  • Hydration (A)
  • Non-evaporable water content
  • Porosity
  • Silica fume (D)
  • Vitreous calcium aluminosilicate

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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