An atomistic building block description of C-S-H - Towards a realistic C-S-H model

Aslam Kunhi Mohamed, Stephen C. Parker, Paul Bowen, Sandra Galmarini

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Understanding the atomistic structure of Calcium silicate hydrate (C-S-H), the main product of cement hydration, is of paramount importance to better formulate sustainable cement. The existing atomistic models are not in total agreement with experimental results and fail to explain the nanosized nature of C-S-H. Here, we present a new approach for describing the complexity of these structures at the molecular level, enabling a detailed comparison of C-S-H models. The new methodology encodes a full, large scale atomistic C-S-H structure by a simple, readable string of characters, similar to the way the base sequence in DNA encodes a vast range of different proteins. We then use the methodology to assess 14 Å tobermorite-defect structures and their stabilities using DFT and classical molecular dynamics. Finally we highlight how the model may be extended to develop reliable atomistic C-S-H models for a range of Ca/Si ratios and conditions.

Original languageEnglish
Pages (from-to)221-235
Number of pages15
JournalCement and Concrete Research
Volume107
DOIs
Publication statusPublished - 1 May 2018

Keywords

  • C-S-H
  • Cementitious systems
  • Crystal structure
  • Density functional theory
  • Molecular dynamics

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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