Influence of chloride and moisture content on steel rebar corrosion in concrete

被引：19

作者：

Ahlstrom, J. ^{[1
]}

Tidblad, J. ^{[1
]}

Sederholm, B. ^{[1
]}

Wadso, L. ^{[2
]}

机构：

[1] Swerea KIMAB, Isafjordsgatan 28A, S-16440 Kista, Sweden

[2] Lund Univ, Div Bldg Mat, Box 118, SE-22100 Lund, Sweden

来源：

MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION | 2016年 / 67卷 / 10期

关键词：

chloride; concrete; corrosion; moisture; steel; REINFORCEMENT CORROSION; CARBON-STEEL; RESISTIVITY;

D O I：

10.1002/maco.201508799

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Reinforced mortar samples were exposed in humidity chambers with different relative humidity or exposed in cyclic moisture conditions. The rebars were in an as received condition meaning that the preexisting oxide scale were intact. The lowest chloride concentration that initiated corrosion was 1% Cl- by mass of cement, corrosion was then observed for samples exposed at 97% relative humidity. It is suggested that the corrosion rate decreases when samples are exposed to a relative humidity lower than 97%. The results indicate that threshold levels should be evaluated at rather humid conditions (97%) despite the fact that the maximum corrosion rate at higher chloride levels is observed in the interval 91-94%. For samples exposed to cyclic moisture conditions, a lower chloride concentration was needed to initiate corrosion compared to samples exposed in static moisture conditions.

引用

页码：1049 / 1058

页数：10

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