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Titel:
Numerical simulation of cementitious materials degradation under external sulfate attack
 
Auteur(s):
Sarkar, S.; Mahadevan, S.; Meeussen, J.C.L.; Sloot, H.A. van der; Kosson, D.S.
 
Gepubliceerd door: Publicatie datum:
ECN Biomassa, Kolen en Milieuonderzoek 15-9-2010
 
ECN publicatienummer: Publicatie type:
ECN-W--10-036 Artikel wetenschap tijdschrift
 
Aantal pagina's:
13  

Gepubliceerd in: Cement & Concrete Composites (), , 2010, Vol.32, p.241-252.

Samenvatting:
A numerical methodology is proposed in this paper to simulate the degradation of cementitious materials under external sulfate attack. The methodology includes diffusion of ions in and out of the structure, chemical reactions which lead to dissolution and precipitation of solids, and mechanical damage accumulation using a continuum damage mechanics approach. Diffusion of ions is assumed to occur under a concentration gradient as well as under a chemical activity gradient. Chemical reactions are assumed to occur under a local equilibrium condition which is considered to be valid for diffusion controlled reaction mechanisms. A macro-scale representation of mechanical damage is used in this model which reflects the cracking state of the structure. The mechanical and diffusion properties are modified at each time step based on the accumulated damage. The model is calibrated and validated using experimental results obtained from the literature. The usefulness of the model in evaluating the mineralogical evolution and mechanical deterioration of the structure is demonstrated.


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