Pore structure of hydrating cement paste by magnetic resonance relaxation analysis and freezing

J. Y. Jehng*, D. T. Sprague, W. P. Halperin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

Nuclear magnetic resonance relaxation analysis has been applied to interpret the evolution of microstructure in a cement paste during hydration. A basic understanding of the wet-dry and freeze-thaw processes of cement pastes has been developed. The pore structure evolution has been studied by the suppression of the freezing temperature of water and compared with spin- spin relaxation analysis performed at room temperature. Both methods consistently show that hydrating cement pastes have two principal components in their size distribution. The NMR relaxation times provide a measure of the characteristic pore sizes. Their interpretation is made in the context of a fast exchange model. Supercooling and thawing point depression of confined water has been studied systematically. The depression of the freezing point of liquid water confined within a pore was found to be dependent on the pore size, with capillary pore water freezing at 240 K and the remaining gel pore water freezing over a temperature range extending to as low as 160 K. A modified Gibbs-Thompson analysis was used to determine pore volume distributions from the distribution of thawing temperatures.

Original languageEnglish (US)
Pages (from-to)785-791
Number of pages7
JournalMagnetic Resonance Imaging
Volume14
Issue number7-8
DOIs
StatePublished - 1996

Keywords

  • Cement hydration
  • Freezing
  • NMR
  • Porous media

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging

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