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Behaviour of stainless steel in simulated concrete pore solution

Bertolini, L. / Bolzoni, F. / Pastore, T. / Pedeferri, P.

Stainless steels can be used in the repair of reinforced concrete structures where impervious concrete or a suitable concrete cover can not be obtained. They have also been proposed for parts of new structures subjected to chloride penetration under very aggressive environmental conditions, especially in joints and more superficial reinforcements. The localised corrosion behaviour of austenitic, martensitic, and duplex stainless steels has been studied in several solutions simulating the liquid present in the pores of both alkaline and carbonated concrete in the presence of chloride ions. The work aimed to evaluate the suitability of these types of stainless steel as rebars in reinforced concrete structures exposed to very aggressive environments. Electrochemical tests habe been performed in solutions with pH values in the range 7.6-13.9, chloride concentration in the range 0-10 %, and temperatures of 20 and 40 deg C. The adverse effect of decrease in pH on critical chloride content is discussed, as a function of stainless steel composition and temperature, and the inhibitive effect of high carbonate/bicarbonate concentrations is also shown.

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Behaviour of stainless steel in simulated concrete pore solution

Bertolini, L. / Bolzoni, F. / Pastore, T. / Pedeferri, P.

Stainless steels can be used in the repair of reinforced concrete structures where impervious concrete or a suitable concrete cover can not be obtained. They have also been proposed for parts of new structures subjected to chloride penetration under very aggressive environmental conditions, especially in joints and more superficial reinforcements. The localised corrosion behaviour of austenitic, martensitic, and duplex stainless steels has been studied in several solutions simulating the liquid present in the pores of both alkaline and carbonated concrete in the presence of chloride ions. The work aimed to evaluate the suitability of these types of stainless steel as rebars in reinforced concrete structures exposed to very aggressive environments. Electrochemical tests habe been performed in solutions with pH values in the range 7.6-13.9, chloride concentration in the range 0-10 %, and temperatures of 20 and 40 deg C. The adverse effect of decrease in pH on critical chloride content is discussed, as a function of stainless steel composition and temperature, and the inhibitive effect of high carbonate/bicarbonate concentrations is also shown.

Behaviour of stainless steel in simulated concrete pore solution

Bertolini, L. / Bolzoni, F. / Pastore, T. / Pedeferri, P.

Stainless steels can be used in the repair of reinforced concrete structures where impervious concrete or a suitable concrete cover can not be obtained. They have also been proposed for parts of new structures subjected to chloride penetration under very aggressive environmental conditions, especially in joints and more superficial reinforcements. The localised corrosion behaviour of austenitic, martensitic, and duplex stainless steels has been studied in several solutions simulating the liquid present in the pores of both alkaline and carbonated concrete in the presence of chloride ions. The work aimed to evaluate the suitability of these types of stainless steel as rebars in reinforced concrete structures exposed to very aggressive environments. Electrochemical tests habe been performed in solutions with pH values in the range 7.6-13.9, chloride concentration in the range 0-10 %, and temperatures of 20 and 40 deg C. The adverse effect of decrease in pH on critical chloride content is discussed, as a function of stainless steel composition and temperature, and the inhibitive effect of high carbonate/bicarbonate concentrations is also shown.

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Title:

Behaviour of stainless steel in simulated concrete pore solution

Additional title:

Verhalten von nichtrostendem Stahl in simulierter Lösung von Betonporen

Contributors:

Bertolini, L. (author) / Bolzoni, F. (author) / Pastore, T. (author) / Pedeferri, P. (author)

Published in:

British Corrosion Journal ; 31 ; 218-222

Publication date:

1996

Size:

5 Seiten, 5 Bilder, 1 Tabelle, 20 Quellen

ISSN:

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

nichtrostender Stahl , Stahlbeton , Armierung , pH-Wert , Chlorid , Carbonat , Korrosionsstrom , Lochfraßkorrosion , Temperaturabhängigkeit , Beton , Porosität , potentiostatische Prüfung , Chrom-Nickel-Stahl , Chrom-Nickel-Molybdän-Stahl

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