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Elucidating the Effect of Water-To-Cement Ratio on the Hydration Mechanisms of Cement
ACS Omega
  • Aida Margarita Ley-Hernandez
  • Jonathan Lapeyre
  • Rachel Cook
  • Aditya Kumar, Missouri University of Science and Technology
  • Dimitri Feys, Missouri University of Science and Technology
Abstract

The hydration of cement is often modeled as a phase boundary nucleation and growth (pBNG) process. Classical pBNG models, based on the use of isotropic and constant growth rate of the main hydrate, that is, calcium-silicate-hydrate (C-S-H), are unable to explain the lack of any significant effect of the water-to-cement (w/c) ratio on the hydration kinetics of cement. This paper presents a modified form of the pBNG model, in which the anisotropic growth of C-S-H is allowed to vary in relation to the nonlinear evolution of its supersaturation in solution. Results show that once the supercritical C-S-H nuclei form, their growth remains confined within a region in proximity to the cement particles. This is hypothesized to be a manifestation of the sedimentation of cement particles, which imposes a space constraint for C-S-H growth. In pastes wherein the sedimentation of cement particles is disrupted, the hydration kinetics are no longer unresponsive to changes in w/c. Unlike C-S-H, the ions in solution are not confined, and hence, the supersaturation-dependent growth rate of C-S-H diminishes monotonically with increasing w/c. Overall, the outcomes of this work highlight important aspects that need to be considered in employing pBNG models for simulating hydration of cement-based systems.

Department(s)
Materials Science and Engineering
Second Department
Civil, Architectural and Environmental Engineering
Comments
This research was conducted in the Materials Research Center (MRC) at Missouri S&T. The authors gratefully acknowledge the financial support that has made these laboratories and their operations possible. Funding for this research was provided by the National Science Foundation [NSF, CMMI: 1661609], MRC at Missouri S&T [MRC Young Investigator Seed Funding] and the University of Missouri Research Board [UMRB].
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2018 American Chemical Society (ACS), All rights reserved.
Publication Date
5-1-2018
Citation Information
Aida Margarita Ley-Hernandez, Jonathan Lapeyre, Rachel Cook, Aditya Kumar, et al.. "Elucidating the Effect of Water-To-Cement Ratio on the Hydration Mechanisms of Cement" ACS Omega Vol. 3 Iss. 5 (2018) p. 5092 - 5105 ISSN: 2470-1343
Available at: http://works.bepress.com/aditya-kumar/19/