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Aggregate expansivity due to sulfide oxidation - II. Physico-chemical modeling of sulfate attack

Casanova, I. / Aguado, A. / Agullo, L.

Oxidation of sulfide-bearing aggregates induces a sulfate attack reaction on the surrounding mortar through the release of sulfate ions and reaction with tricalcium aluminate from the cement. The rate of oxidation is slow, and depends strongly on the alkalinity of the pore solutions, the availability of molecular oxygen and the grain size of the aggregate. However, the sulfate attack reaction are much faster and can be modeled using equilibrium thermodynamics. The extent of sulfate attack (dimensions of the reaction aureoles) have been successfully simulated using a spherical geometry model, aggregate and cement compositions, and mix proportions for each case studied. The good agreement between calculated values and aureoles observed in concrete specimens strengthens the validity of physicochemical modeling as a tool for the prediction of pathologies due to sulfate attack.

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Aggregate expansivity due to sulfide oxidation - II. Physico-chemical modeling of sulfate attack

Casanova, I. / Aguado, A. / Agullo, L.

Oxidation of sulfide-bearing aggregates induces a sulfate attack reaction on the surrounding mortar through the release of sulfate ions and reaction with tricalcium aluminate from the cement. The rate of oxidation is slow, and depends strongly on the alkalinity of the pore solutions, the availability of molecular oxygen and the grain size of the aggregate. However, the sulfate attack reaction are much faster and can be modeled using equilibrium thermodynamics. The extent of sulfate attack (dimensions of the reaction aureoles) have been successfully simulated using a spherical geometry model, aggregate and cement compositions, and mix proportions for each case studied. The good agreement between calculated values and aureoles observed in concrete specimens strengthens the validity of physicochemical modeling as a tool for the prediction of pathologies due to sulfate attack.

Aggregate expansivity due to sulfide oxidation - II. Physico-chemical modeling of sulfate attack

Casanova, I. / Aguado, A. / Agullo, L.

Oxidation of sulfide-bearing aggregates induces a sulfate attack reaction on the surrounding mortar through the release of sulfate ions and reaction with tricalcium aluminate from the cement. The rate of oxidation is slow, and depends strongly on the alkalinity of the pore solutions, the availability of molecular oxygen and the grain size of the aggregate. However, the sulfate attack reaction are much faster and can be modeled using equilibrium thermodynamics. The extent of sulfate attack (dimensions of the reaction aureoles) have been successfully simulated using a spherical geometry model, aggregate and cement compositions, and mix proportions for each case studied. The good agreement between calculated values and aureoles observed in concrete specimens strengthens the validity of physicochemical modeling as a tool for the prediction of pathologies due to sulfate attack.

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Title:

Aggregate expansivity due to sulfide oxidation - II. Physico-chemical modeling of sulfate attack

Additional title:

Ausdehnungsverhalten von Zuschlagstoffen bei Sulfidoxidation. Teil 2: Physikalisch-chemisches Modell des Sulfatangriffs

Contributors:

Casanova, I. (author) / Aguado, A. (author) / Agullo, L. (author)

Published in:

Cement and Concrete Research ; 27 ; 1627-1632

Publication date:

1997

Size:

6 Seiten, 3 Bilder, 1 Tabelle, 11 Quellen

ISSN:

DOI:

https://doi.org/10.1016/S0008-8846(97)00148-8

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Sulfid , Korrosion , Oxidation , Mörtel , Sulfat , Tricalciumaluminat , Reaktionsgeschwindigkeit , Korngröße , Dehnung , Siderit , Thermodynamik , Modell , pH-Wert , Calciumaluminatsulfathydrat , chemische Reaktion , chemischer Angriff , Zuschlagstoff

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