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C-S-H/solution interface: Experimental and Monte Carlo studies

Labbez, Christophe; Pochard, Isabelle; Jönsson, Bo LU and Nonat, Andre (2011) In Cement and Concrete Research 41(2). p.161-168
Abstract
The surface charge density of C-S-H particles appears to be one of the key parameters for predicting the cohesion strength, understanding the ion retention, the pollutant leakage, and admixture adsorption in hydrated cement pastes. This paper presents a Monte Carlo simulation of the surface-ions interactions that permits the prediction of surface charge density (sigma), electrokinetic potential (zeta) and ions adsorption of mineral surfaces in equilibrium with a given electrolyte solution. Simulated results are compared to experimental data obtained by titration, electrokinetic potential measurements and ions uptake in the case of C-S-H suspensions. An excellent agreement is found between simulated and experimental results. The wide spread... (More)
The surface charge density of C-S-H particles appears to be one of the key parameters for predicting the cohesion strength, understanding the ion retention, the pollutant leakage, and admixture adsorption in hydrated cement pastes. This paper presents a Monte Carlo simulation of the surface-ions interactions that permits the prediction of surface charge density (sigma), electrokinetic potential (zeta) and ions adsorption of mineral surfaces in equilibrium with a given electrolyte solution. Simulated results are compared to experimental data obtained by titration, electrokinetic potential measurements and ions uptake in the case of C-S-H suspensions. An excellent agreement is found between simulated and experimental results. The wide spread idea that calcium is a potential determining ion in cement paste systems appears to be incorrect. Instead, the pH controls the charging behaviour of C-S-H nano-particles. This paper also shows to what extent the electrostatic interactions contribute to the measured Ca/Si ratio. (C) 2010 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
B: Calcium-silicate-hydrate (C-S-H), Surface charge density, Electrokinetic potential, Cation, Adsorption
in
Cement and Concrete Research
volume
41
issue
2
pages
161 - 168
publisher
Elsevier
external identifiers
  • wos:000286861100003
  • scopus:78650722551
ISSN
0008-8846
DOI
10.1016/j.cemconres.2010.10.002
language
English
LU publication?
yes
id
2979af71-d997-4bb5-887b-12cd8dba307c (old id 1878125)
date added to LUP
2011-04-14 14:35:39
date last changed
2017-09-10 04:11:44
@article{2979af71-d997-4bb5-887b-12cd8dba307c,
  abstract     = {The surface charge density of C-S-H particles appears to be one of the key parameters for predicting the cohesion strength, understanding the ion retention, the pollutant leakage, and admixture adsorption in hydrated cement pastes. This paper presents a Monte Carlo simulation of the surface-ions interactions that permits the prediction of surface charge density (sigma), electrokinetic potential (zeta) and ions adsorption of mineral surfaces in equilibrium with a given electrolyte solution. Simulated results are compared to experimental data obtained by titration, electrokinetic potential measurements and ions uptake in the case of C-S-H suspensions. An excellent agreement is found between simulated and experimental results. The wide spread idea that calcium is a potential determining ion in cement paste systems appears to be incorrect. Instead, the pH controls the charging behaviour of C-S-H nano-particles. This paper also shows to what extent the electrostatic interactions contribute to the measured Ca/Si ratio. (C) 2010 Elsevier Ltd. All rights reserved.},
  author       = {Labbez, Christophe and Pochard, Isabelle and Jönsson, Bo and Nonat, Andre},
  issn         = {0008-8846},
  keyword      = {B: Calcium-silicate-hydrate (C-S-H),Surface charge density,Electrokinetic potential,Cation,Adsorption},
  language     = {eng},
  number       = {2},
  pages        = {161--168},
  publisher    = {Elsevier},
  series       = {Cement and Concrete Research},
  title        = {C-S-H/solution interface: Experimental and Monte Carlo studies},
  url          = {http://dx.doi.org/10.1016/j.cemconres.2010.10.002},
  volume       = {41},
  year         = {2011},
}