Materiales de Construcción, Vol 64, No 316 (2014)

3D Computational Simulation of Calcium Leaching in Cement Matrices


https://doi.org/10.3989/mc.2014.08813

J. J. Gaitero
Tecnalia, Spain

J. S. Dolado
Tecnalia, Spain

C. Neuen
Fraunhofer-Institute for Algorithms and Scientific Computing SCAI, Germany

F. Heber
University of Bonn, Germany

E. A.B. Koenders
Delf University of Technology, Netherlands

Abstract


Calcium leaching is a degradation process consisting in progressive dissolution of the cement paste by migration of calcium atoms to the aggressive solution. It is therefore, a complex phenomenon involving several phases and dissolution and diffusion processes simultaneously. Along this work, a new computational scheme for the simulation of the degradation process in three dimensions was developed and tested. The toolkit was used to simulate accelerated calcium leaching by a 6M ammonium nitrate solution in cement matrices. The obtained outputs were the three dimensional representation of the matrix and the physicochemical properties of individual phases as a consequence of the degradation process. This not only makes it possible to study the evolution of such properties as a function of time but also as a function of the position within the matrix. The obtained results are in good agreement with experimental values of the elastic modulus in degraded and undegraded samples.

Keywords


Cement paste; Microstructure; Modelization; Durability; Transport properties

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References


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