Liquid-phase Self-diffusion in Hydrating Cement Pastes--Results from NMR Studies and Perspectives for Further Research

Changes in the pore structure of hydrating cement are accompanied by changes in the dynamics of liquid phases contained in the pore system of the hydrating matrix. Dynamic NMR methods (relaxometry, diffusometry) allow the non-destructive observation of these changes. Relaxometry can be performed using quite simple equipment and has been widely used in kinetic studies of cement hydration. Diffusion studies, by contrast, require much more sophisticated equipment. Conversely, the diffusion coefficient has a direct relevance for the transport of moisture or contaminants in the cement matrix while relaxation time measurements provide more indirect information. The aim of this paper is to review the possibilities of field gradient NMR in diffusion studies on hydrating cement and provide an outlook on how this information can be used for improving understanding of the properties and microstructure of hydrating cement. New results on the relationship between the diffusive exchange length in the sample and non-exponential relaxation in cement are also discussed.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01046604
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 28 2007 9:04AM