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- W2330494505 endingPage "10877" @default.
- W2330494505 startingPage "10871" @default.
- W2330494505 abstract "Cement hydration occurs when water is added to cement powder, leading to the formation of crystalline products like Portlandite and the quasi-amorphous, poorly crystalline, calcium silicate hydrate (C–S–H) gel. Despite its importance in determining the final properties of the cement, many models exist for the nano and sub-nano level organization of this “liquid stone.” 1H NMR relaxometry in White Portland Cement paste during hydration allowed us to monitor the formation and evolution of the multiscale porosity of the cement, with the formation of structures at nano and sub-nano levels of C–S–H gel (calcium silicate interlayer water, water in small and large gel pores) along with three low-mobility 1H pools, identified as 1H nuclei in C–S–H layers, likely belonging to OH groups, with 1H nuclei in Portlandite, and in crystal water of Ettringite. By assuming these assignments, our data allowed us to compute the distances of pairs of 1H nuclei in Portlandite and in crystal water ((1.9 ± 0.2) Å and (1.6 ± 0.1) Å, respectively), consistent with the known values of these distances. The picture of the porous structure at nano and sub-nano levels emerging from our results is consistent with the Jennings colloidal model for C–S–H gel. Moreover, the constant values observed during hydration of parameters extracted from our data analysis strongly support that model, being compatible with the picture of C–S–H gel developing in comparable-sized clumps of the same composition, but not easily interpretable by models proposing quasi continuous sheets of C–S–H layers." @default.
- W2330494505 created "2016-06-24" @default.
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- W2330494505 date "2014-09-07" @default.
- W2330494505 modified "2023-09-30" @default.
- W2330494505 title "Nano and Sub-nano Multiscale Porosity Formation and Other Features Revealed by <sup>1</sup>H NMR Relaxometry during Cement Hydration" @default.
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- W2330494505 doi "https://doi.org/10.1021/la501677k" @default.
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- W2330494505 hasPublicationYear "2014" @default.
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