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Journal of Materials Science

, Volume 29, Issue 24, pp 6427–6433 | Cite as

Step-by-step observation of the hydration of C3S by magic-angle spinning 29Si nuclear magnetic resonance: the masking effect of D2O

  • A. Comotti
  • G. Castaldi
  • C. Gilioli
  • G. Torri
  • P. Sozzani
Papers

Abstract

High-resolution solid-state 29Si nuclear magnetic resonance (NMR) characterization of hydrated C3S provides a means of selectively observing the hydrogen-containing phases. In particular, by applying the cross-polarization (CP) technique, we demonstrated that a contrast can be obtained, not only for hydrated against anhydrous phases, but also for hydrogen-hydrated against deuterium-hydrated phases. Selectively deuterated samples were thus prepared by a H2O/D2O alternated hydration procedure. The progress of the polycondensation of orthosilicates as derived by H2O was followed, demonstrating that a separate microphase of anhydrous C3S prevailingly reacted at any step. An induction period, showing a low reactivity and mainly formation of Qo hydrated was observed during the first hydration steps of selectively deuterated samples. The efficiency of the masking effect of D2O was also indirectly proven by comparison with calorimetric measurements.

Keywords

Polymer Hydration Nuclear Magnetic Resonance Material Processing Induction Period 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • A. Comotti
    • 1
  • G. Castaldi
    • 1
  • C. Gilioli
    • 1
  • G. Torri
    • 2
  • P. Sozzani
    • 3
  1. 1.Italcementi S.p.a.Central Research and Development DepartmentBergamoItaly
  2. 2.Istituto RonzoniMilanoItaly
  3. 3.Dipartimento di Ingegneria MeccanicaUniversità di BresciaBresciaItaly

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