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

Evolution of pyrrhotite oxidation in aggregates for concrete


https://doi.org/10.3989/mc.2014.08413

I. Oliveira
Universidad Politécnica de Cataluña, Spain

S. H.P. Cavalaro
Universidad Politécnica de Cataluña, Spain

A. Aguado
Universidad Politécnica de Cataluña, Spain

Abstract


Rocks containing pyrrhotite bands are sometimes used to produce concrete. These rocks oxidize and produce long-term expansive reactions that damage concrete structures, leading to important economic and risk related repercussions. The present study analyses several aspects that affect the oxidation process of the aggregate such as the existence of preferential paths for the entrance of the oxidizing agent and the conversion process of the chemical elements involved in the reaction. For that, host rock samples containing pyrrhotite were investigated by scanning electron microscopy and energy dispersive spectroscopy. The results shows that the pyrrhotite appears in bands that create planes of weakness and present cracks that serve as preferential paths for the entrance of oxygen. Furthermore, a new representation is proposed for the oxidation process.

Keywords


Iron sulfide; Oxidation; Aggregate; Internal sulfate attack; Dam

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References


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