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

In English

Författare

Summary, in 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 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.

Publiceringsår

1999

Språk

Engelska

Sidor

1513-1517

Publikation/Tidskrift/Serie

Cement and Concrete Research

Volym

29

Issue

9

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Mathematics
  • Chemical Sciences

Nyckelord

  • Modeling
  • Hydration
  • Retardation
  • Kinetics

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0008-8846