Comparison of guarded and unguarded linear polarization CCD devices with weight loss measurements

Autor:	Youping Liu, Richard E. Weyers
Rok vydání:	2003
Předmět:	Materials science Linear polarization Electrode General Materials Science Building and Construction Composite material Corrosion current density Reinforced concrete Current density Electrochemical corrosion Electric resistivity Corrosion
Zdroj:	Cement and Concrete Research. 33:1093-1101
ISSN:	0008-8846
DOI:	10.1016/s0008-8846(03)00018-8
Popis:	Two types of linear polarization devices may be used to measure the corrosion current density (CCD) to assess the degree of active corrosion in concrete structures. The devices, with and without a guard electrode, provide significantly different CCD values for the same conditions. The 5-year study reported herein presents a comparison of the two devices over a range of CCD values from passive to highly active corrosion conditions for outdoor exposure slabs. The results demonstrate that both devices are able to qualitatively rank the instantaneous corrosion conditions in structures. The guarded electrode device measurements were less quantitatively precise than the unguarded electrode device. The guarded electrode device underestimated the amount of metal loss by a factor of 4–6. The unguarded electrode device overestimate the metal loss by a factor of about 1.5 when compared to weight loss measurements and adjusted for concrete temperature and resistance.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7b5c82829b9f8b0204568c5166b397f3 https://doi.org/10.1016/s0008-8846(03)00018-8 Zobrazit plný text záznamu Full Text from ScienceDirect