| Title | Simulating the hydration of cementitious phases with an oscillating rate of reaction |
| Authors | Cecilie Evju, Eskil Hansen, Staffan Hansen |
| Alternative Location | http://dx.doi.org/10.1016/S..., Restricted Access |
| Publication | Cement and concrete research |
| Year | 1999 |
| Volume | 29 |
| Issue | 9 |
| Pages | 1513 - 1517 |
| Document type | Article |
| Status | Published |
| Quality controlled | Yes |
| Language | eng |
| Publisher | Pergamon |
| Abstract English | 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 xold1 - 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. |
| Keywords | Modeling, Hydration, Retardation, Kinetics, |
| ISBN/ISSN/Other | ISSN: 0008-8846 |
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