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3D computational simulation of calcium leaching in cement matrices

: Gaitero, J.J.; Dolado, J.S.; Neuen, C.; Heber, F.; Koenders, E.A.B.

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Materiales de Construccion 64 (2014), Nr.316, Art.e035
ISSN: 0465-2746
European Commission EC
FP7-NMP; 214030; CODICE
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer SCAI ()

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.