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Simulating the hydration of cementitious phases with an oscillating rate of reaction

Evju, Cecilie LU ; Hansen, Eskil LU and Hansen, Staffan LU (1999) In Cement and Concrete Research 29(9). p.1513-1517
Abstract
To investigate how an oscillating reaction rate might influence the hydration of cementitious solids, a simple iterative mathematical model that includes recurrent passivation of the surface has been constructed. The algorithm generates a wide variety of hydration curves with a limited number of input parameters: i.e.. V0 (volume of unreacted solid after initial reaction), a, (degree of reaction upon initial wetting), x0 (fraction of particle surface passivated after initial wetting); running index: n (cycle number, with an arbitrary unit of time per cycle); constants: m (number of cycles with constant x, the relative rate of the hydration and passivation reactions), k (maximum linear rate of reaction front), and lambda (range 0-1,... (More)
To investigate how an oscillating reaction rate might influence the hydration of cementitious solids, a simple iterative mathematical model that includes recurrent passivation of the surface has been constructed. The algorithm generates a wide variety of hydration curves with a limited number of input parameters: i.e.. V0 (volume of unreacted solid after initial reaction), a, (degree of reaction upon initial wetting), x0 (fraction of particle surface passivated after initial wetting); running index: n (cycle number, with an arbitrary unit of time per cycle); constants: m (number of cycles with constant x, the relative rate of the hydration and passivation reactions), k (maximum linear rate of reaction front), and lambda (range 0-1, determines the general passivation behaviour, modelled by the algorithm x(new) = 4 lambda xold[1 - xold]). The hydration process is described by the sequence: (1) Delta V = k(1 - x)V^2/3, (2) Vnew = Vold - Delta V, (3) alpha = 1 - (V/V0) + alpha0. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Modeling, Hydration, Retardation, Kinetics
in
Cement and Concrete Research
volume
29
issue
9
pages
1513 - 1517
publisher
Elsevier
external identifiers
  • scopus:0033189283
ISSN
0008-8846
DOI
10.1016/S0008-8846(99)00134-9
language
English
LU publication?
yes
id
bf538aef-a2e4-43c5-88ab-9ae366d41bc4 (old id 1224025)
date added to LUP
2008-09-04 16:52:24
date last changed
2017-01-01 06:41:57
@article{bf538aef-a2e4-43c5-88ab-9ae366d41bc4,
  abstract     = {To investigate how an oscillating reaction rate might influence the hydration of cementitious solids, a simple iterative mathematical model that includes recurrent passivation of the surface has been constructed. The algorithm generates a wide variety of hydration curves with a limited number of input parameters: i.e.. V0 (volume of unreacted solid after initial reaction), a, (degree of reaction upon initial wetting), x0 (fraction of particle surface passivated after initial wetting); running index: n (cycle number, with an arbitrary unit of time per cycle); constants: m (number of cycles with constant x, the relative rate of the hydration and passivation reactions), k (maximum linear rate of reaction front), and lambda (range 0-1, determines the general passivation behaviour, modelled by the algorithm x(new) = 4 lambda xold[1 - xold]). The hydration process is described by the sequence: (1) Delta V = k(1 - x)V^2/3, (2) Vnew = Vold - Delta V, (3) alpha = 1 - (V/V0) + alpha0.},
  author       = {Evju, Cecilie and Hansen, Eskil and Hansen, Staffan},
  issn         = {0008-8846},
  keyword      = {Modeling,Hydration,Retardation,Kinetics},
  language     = {eng},
  number       = {9},
  pages        = {1513--1517},
  publisher    = {Elsevier},
  series       = {Cement and Concrete Research},
  title        = {Simulating the hydration of cementitious phases with an oscillating rate of reaction},
  url          = {http://dx.doi.org/10.1016/S0008-8846(99)00134-9},
  volume       = {29},
  year         = {1999},
}