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Threshold steel corrosion rates for durability problems in reinforced structures

Gonzalez, J.A. / Feliu, S. / Rodriguez, P.

Mortar cracking was investigated by impressing a constant anodic current density onto steel reinforcements. The time and the corrosion penetration required for crack onset was determined. Tests were carried out in calcium hydroxide (Ca(OH)2)-saturated solutions and in mortar with and without chloride (Cl(-)) addition. Data reproducibility was poor and could be ascribed to current efficiencies much >100 %, corroded surface area fractions much <100 %, and occasional diffusion of corrosion products via macropores to the mortar surface. Notwithstanding potential effects of these uncertainties, results showed penetrations of a few tens of micrometers could give rise to cracking. Fairly low corrosion rates of about 1 microA cm^-2 could result in hazardous damage during short service periods (5y to 10y).

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Threshold steel corrosion rates for durability problems in reinforced structures

Gonzalez, J.A. / Feliu, S. / Rodriguez, P.

Mortar cracking was investigated by impressing a constant anodic current density onto steel reinforcements. The time and the corrosion penetration required for crack onset was determined. Tests were carried out in calcium hydroxide (Ca(OH)2)-saturated solutions and in mortar with and without chloride (Cl(-)) addition. Data reproducibility was poor and could be ascribed to current efficiencies much >100 %, corroded surface area fractions much <100 %, and occasional diffusion of corrosion products via macropores to the mortar surface. Notwithstanding potential effects of these uncertainties, results showed penetrations of a few tens of micrometers could give rise to cracking. Fairly low corrosion rates of about 1 microA cm^-2 could result in hazardous damage during short service periods (5y to 10y).

Threshold steel corrosion rates for durability problems in reinforced structures

Gonzalez, J.A. / Feliu, S. / Rodriguez, P.

Mortar cracking was investigated by impressing a constant anodic current density onto steel reinforcements. The time and the corrosion penetration required for crack onset was determined. Tests were carried out in calcium hydroxide (Ca(OH)2)-saturated solutions and in mortar with and without chloride (Cl(-)) addition. Data reproducibility was poor and could be ascribed to current efficiencies much >100 %, corroded surface area fractions much <100 %, and occasional diffusion of corrosion products via macropores to the mortar surface. Notwithstanding potential effects of these uncertainties, results showed penetrations of a few tens of micrometers could give rise to cracking. Fairly low corrosion rates of about 1 microA cm^-2 could result in hazardous damage during short service periods (5y to 10y).

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Title:

Threshold steel corrosion rates for durability problems in reinforced structures

Additional title:

Grenzkorrosionsgeschwindigkeit von Stahl bei der Lebensdauer von Stahlbeton

Contributors:

Gonzalez, J.A. (author) / Feliu, S. (author) / Rodriguez, P. (author)

Published in:

Corrosion, Houston ; 53 ; 65-71

Publication date:

1997

Size:

7 Seiten, 4 Bilder, 5 Tabellen, 21 Quellen

ISSN:

DOI:

https://doi.org/10.5006/1.3280436

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Beton , Armierung , Rissbildung , Stromdichte , Anode , Calciumverbindung , Chlorid , Lebensdauer , Nitrit , Korrosionsgeschwindigkeit , Korrosionsmechanismus , Korrosionsprodukt , Calciumhydroxid , anodischer Strom , Stromausbeute , Abplatzen , Mörtel

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