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Microstructure evolution of hydrated cement pastes.

A Plassais1, M-P Pomiès, N Lequeux

  • 1Laboratoire de Physico-Chimie des Polymères et Milieux Dispersés, UMR 7612 du CNRS, Ecole Supérieure de Physique et de Chimie Industrielles, 10, rue Vauquelin, 75231 Paris Cedex 05, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 31, 2005
PubMed
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This study introduces a novel NMR method to analyze cement paste microstructure, revealing how pore size distribution evolves and is influenced by hydration and additives, crucial for material properties.

Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Understanding cement hydration is key to controlling material properties.
  • Characterizing the evolving microstructure of cement paste is complex.
  • Pore structure significantly impacts cement's mechanical performance.

Purpose of the Study:

  • To develop and apply a novel NMR method for detailed cement paste microstructure analysis.
  • To investigate the evolution of pore size distribution during cement hydration.
  • To assess the influence of water-to-cement ratio and additives on pore structure.

Main Methods:

  • Proton nuclear magnetic relaxation dispersion (NMR)
  • High-resolution NMR spectroscopy
  • Analysis of pore size distribution (2-500 nm)

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Main Results:

  • The method successfully assesses local proton sites and dynamics.
  • Cement paste pore size distribution evolves towards a surface-fractal distribution (Df = 2.6).
  • Water-to-cement ratio and ultrafine particles significantly modify pore size distribution.

Conclusions:

  • The proposed NMR technique offers a comprehensive approach to characterizing porous media.
  • The findings link microstructure evolution to potential mechanical properties of cement.
  • This method is applicable to various porous materials with confined water and reactive surfaces.