Characterization of surface corrosion of reinforcing steel in cement paste by low frequency impedance spectroscopy

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Cement and Concrete Research; (United States)

DOI:https://doi.org/10.1016/0008-8846(94)90048-5· OSTI ID:7274363

Gu, P; Fu, Y; Xie, P ^[1]; Beaudoin, J J ^[2]

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1. Univ. of Ottawa, Ontario (Canada). Dept. of Civil Engineering
2. National Research Council, Ottawa, Ontario (Canada). Materials Lab.

Surface corrosion of reinforcing steel embedded in cementitious materials containing chloride ion is described by characteristic change of impedance spectra. Phase angle shift, surface impedance and capacitive responses, recorded at very low frequency (100Hz-10mHz), are demonstrated to be very sensitive to surface corrosion processes. Information that is difficult to obtain by traditional dc techniques is provided. It was found that longer immersion of specimens in chloride ion solution results in a more significant decrease of the phase angle. A modified equivalent circuit model considering surface corrosion of the steel-cement interface was constructed to simulate the steel surface oxidation behavior. Circuit parameters can be used to explain the experimental results in a qualitative way. The low frequency impedance technique appears to be a very useful nondestructive method for assessing reinforcing steel corrosion.

• OSTI ID: 7274363
• Journal Information: Cement and Concrete Research; (United States), Journal Name: Cement and Concrete Research; (United States) Vol. 24:2; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
360604 -- Materials-- Corrosion
Erosion
& Degradation
ALLOYS
BUILDING MATERIALS
CHEMICAL REACTIONS
COMPOSITE MATERIALS
CONCRETES
CORROSION
ELECTRIC IMPEDANCE
IMPEDANCE
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
MATHEMATICAL MODELS
NONDESTRUCTIVE TESTING
REINFORCED CONCRETE
REINFORCED MATERIALS
STEELS
TESTING