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Dissolution of β-C₂S Cement Clinker: Part 1 Molecular Dynamics (MD) Approach for Different Crystal Facets

Salah Uddin, Khondakar Mohammad ; Izadifar, Mohammadreza ; Ukrainczyk, Neven ; Koenders, Eduardus ; Middendorf, Bernhard (2022):
Dissolution of β-C₂S Cement Clinker: Part 1 Molecular Dynamics (MD) Approach for Different Crystal Facets. (Publisher's Version)
In: Materials, 15 (18), MDPI, e-ISSN 1996-1944,
DOI: 10.26083/tuprints-00022482,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: Dissolution of β-C₂S Cement Clinker: Part 1 Molecular Dynamics (MD) Approach for Different Crystal Facets
Language: English
Abstract:

A major concern in the modern cement industry is considering how to minimize the CO₂ footprint. Thus, cements based on belite, an impure clinker mineral (CaO)₂SiO₂ (C₂S in cement chemistry notation), which forms at lower temperatures, is a promising solution to develop eco-efficient and sustainable cement-based materials, used in enormous quantities. The slow reactivity of belite plays a critical role, but the dissolution mechanisms and kinetic rates at the atomistic scale are not known completely yet. This work aims to understand the dissolution behavior of different facets of β-C₂S providing missing input data and an upscaling modeling approach to connect the atomistic scale to the sub-micro scale. First, a combined ReaxFF and metadynamics-based molecular dynamic approach are applied to compute the atomistic forward reaction rates (RD) of calcium (Ca) and silicate species of (100) facet of β-C₂S considering the influence of crystal facets and crystal defects. To minimize the huge number of atomistic events possibilities, a generalized approach is proposed, based on the systematic removal of nearest neighbors’ crystal sites. This enables us to tabulate data on the forward reaction rates of most important atomistic scenarios, which are needed as input parameters to implement the Kinetic Monte Carlo (KMC) computational upscaling approach. The reason for the higher reactivity of the (100) facet compared to the (010) is explained.

Journal or Publication Title: Materials
Volume of the journal: 15
Issue Number: 18
Place of Publication: Darmstadt
Publisher: MDPI
Collation: 14 Seiten
Uncontrolled Keywords: cement dissolution, belite clinker C₂S, free energy surfaces, crystal facets and defects, molecular dynamics simulation, ReaxFF, metadynamics, atomistic activation energy
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
600 Technik, Medizin, angewandte Wissenschaften > 690 Hausbau, Bauhandwerk
Divisions: 13 Department of Civil and Environmental Engineering Sciences > Institute of Construction and Building Materials
Date Deposited: 10 Oct 2022 12:44
Last Modified: 12 Oct 2022 05:38
DOI: 10.26083/tuprints-00022482
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-224821
Additional Information:

This article belongs to the Special Issue Mathematical Modeling of Building Materials

SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22482
PPN: 500264937
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