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- W2068658839 abstract "We propose an original method based on both proton nuclear magnetic relaxation dispersion and high-resolution NMR spectra to investigate the microstructure of synthesized ${mathrm{Ca}}_{3}mathrm{Si}{mathrm{O}}_{5}$-hydrated cement paste. This method allows a clear assessment of the local proton chemical sites as well as the determination of dynamical information of moving proton species in pores. We show also how the microstructure evolves during and after completion of hydration in a range of length scales between 2 and $500phantom{rule{0.3em}{0ex}}mathrm{nm}$. In particular, we show how the pore size distribution of the cement paste reaches progressively a power-law characteristic of a surface-fractal distribution with a dimension ${D}_{f}=2.6$, which takes into account the hierarchical order in the material. Last, we study how this pore size distribution is modified during setting by varying either the water-to-cement ratio or addition of ultrafine particles. This shows that our method could be relevant to relate the mechanical properties to the microstructure of the material. This proposed NMR method is general enough for the characterization of microstructure of any porous media with reactive surface involving water confinement." @default.
- W2068658839 created "2016-06-24" @default.
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- W2068658839 date "2005-10-05" @default.
- W2068658839 modified "2023-10-18" @default.
- W2068658839 title "Microstructure evolution of hydrated cement pastes" @default.
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- W2068658839 doi "https://doi.org/10.1103/physreve.72.041401" @default.
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