Reliability of Galvanostatic Pulse Technique in assessing the corrosion rate of rebar in concrete structures: Laboratory vs field studies

R. Vedalakshmi, L. Balamurugan, V. Saraswathy, Sang Hyo Kim, K. Y. Ann

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Corrosion of rebar in concrete structures is one among the various causes impairing its long-term durability. Precise assessment of corrosion rate (CR) is of prime importance to evaluate the structural safety as well as for estimation of service life of concrete structures. Among the electrochemical techniques, Galvanostatic Pulse Technique (GPT) is very promising for field mapping due to its rapidity. The reliability of GPT in determining the CR under passive and active state of rebar has been carried out using small size laboratory specimens and large scale aged concrete structures. The CR determined by the GPT is compared with the CR obtained by Electrochemical Impedance Spectroscopy Technique (EIST) and weight-loss method. The study reveals that an anodic pulse of 100 μA with a pulse duration of 10 seconds is able to determine the CR from 1-663 μm/y (from negligible to higher corrosion activity) on the rebar network more precisely even up to 65 mm of cover concrete. For instance the rebar corroding at higher rate, the CR predicted by GPT is very close to the CR by weight-loss method whereas it is 20 times less by EIST. In the case of passive state of rebar, the CR predicted by EIST is very close to weight-loss method whereas GPT predicts 10 times higher. In aged structures, the change in microstructure of concrete and loss of moisture from the concrete make the potential of rebar and resistivity of concrete more unpredictable and mislead the status of rebar embedded inside the concrete.

Original languageEnglish
Pages (from-to)867-877
Number of pages11
JournalKSCE Journal of Civil Engineering
Volume14
Issue number6
DOIs
Publication statusPublished - 2010 Nov 1

Fingerprint

Corrosion rate
Concrete construction
Concretes
Electrochemical impedance spectroscopy
Corrosion
Service life
Durability
Moisture
Microstructure

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering

Cite this

@article{397e5063b3e34b51b188c0d0f4423117,
title = "Reliability of Galvanostatic Pulse Technique in assessing the corrosion rate of rebar in concrete structures: Laboratory vs field studies",
abstract = "Corrosion of rebar in concrete structures is one among the various causes impairing its long-term durability. Precise assessment of corrosion rate (CR) is of prime importance to evaluate the structural safety as well as for estimation of service life of concrete structures. Among the electrochemical techniques, Galvanostatic Pulse Technique (GPT) is very promising for field mapping due to its rapidity. The reliability of GPT in determining the CR under passive and active state of rebar has been carried out using small size laboratory specimens and large scale aged concrete structures. The CR determined by the GPT is compared with the CR obtained by Electrochemical Impedance Spectroscopy Technique (EIST) and weight-loss method. The study reveals that an anodic pulse of 100 μA with a pulse duration of 10 seconds is able to determine the CR from 1-663 μm/y (from negligible to higher corrosion activity) on the rebar network more precisely even up to 65 mm of cover concrete. For instance the rebar corroding at higher rate, the CR predicted by GPT is very close to the CR by weight-loss method whereas it is 20 times less by EIST. In the case of passive state of rebar, the CR predicted by EIST is very close to weight-loss method whereas GPT predicts 10 times higher. In aged structures, the change in microstructure of concrete and loss of moisture from the concrete make the potential of rebar and resistivity of concrete more unpredictable and mislead the status of rebar embedded inside the concrete.",
author = "R. Vedalakshmi and L. Balamurugan and V. Saraswathy and Kim, {Sang Hyo} and Ann, {K. Y.}",
year = "2010",
month = "11",
day = "1",
doi = "10.1007/s12205-010-1023-6",
language = "English",
volume = "14",
pages = "867--877",
journal = "KSCE Journal of Civil Engineering",
issn = "1226-7988",
publisher = "Korean Society of Civil Engineers",
number = "6",

}

Reliability of Galvanostatic Pulse Technique in assessing the corrosion rate of rebar in concrete structures : Laboratory vs field studies. / Vedalakshmi, R.; Balamurugan, L.; Saraswathy, V.; Kim, Sang Hyo; Ann, K. Y.

In: KSCE Journal of Civil Engineering, Vol. 14, No. 6, 01.11.2010, p. 867-877.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Reliability of Galvanostatic Pulse Technique in assessing the corrosion rate of rebar in concrete structures

T2 - Laboratory vs field studies

AU - Vedalakshmi, R.

AU - Balamurugan, L.

AU - Saraswathy, V.

AU - Kim, Sang Hyo

AU - Ann, K. Y.

PY - 2010/11/1

Y1 - 2010/11/1

N2 - Corrosion of rebar in concrete structures is one among the various causes impairing its long-term durability. Precise assessment of corrosion rate (CR) is of prime importance to evaluate the structural safety as well as for estimation of service life of concrete structures. Among the electrochemical techniques, Galvanostatic Pulse Technique (GPT) is very promising for field mapping due to its rapidity. The reliability of GPT in determining the CR under passive and active state of rebar has been carried out using small size laboratory specimens and large scale aged concrete structures. The CR determined by the GPT is compared with the CR obtained by Electrochemical Impedance Spectroscopy Technique (EIST) and weight-loss method. The study reveals that an anodic pulse of 100 μA with a pulse duration of 10 seconds is able to determine the CR from 1-663 μm/y (from negligible to higher corrosion activity) on the rebar network more precisely even up to 65 mm of cover concrete. For instance the rebar corroding at higher rate, the CR predicted by GPT is very close to the CR by weight-loss method whereas it is 20 times less by EIST. In the case of passive state of rebar, the CR predicted by EIST is very close to weight-loss method whereas GPT predicts 10 times higher. In aged structures, the change in microstructure of concrete and loss of moisture from the concrete make the potential of rebar and resistivity of concrete more unpredictable and mislead the status of rebar embedded inside the concrete.

AB - Corrosion of rebar in concrete structures is one among the various causes impairing its long-term durability. Precise assessment of corrosion rate (CR) is of prime importance to evaluate the structural safety as well as for estimation of service life of concrete structures. Among the electrochemical techniques, Galvanostatic Pulse Technique (GPT) is very promising for field mapping due to its rapidity. The reliability of GPT in determining the CR under passive and active state of rebar has been carried out using small size laboratory specimens and large scale aged concrete structures. The CR determined by the GPT is compared with the CR obtained by Electrochemical Impedance Spectroscopy Technique (EIST) and weight-loss method. The study reveals that an anodic pulse of 100 μA with a pulse duration of 10 seconds is able to determine the CR from 1-663 μm/y (from negligible to higher corrosion activity) on the rebar network more precisely even up to 65 mm of cover concrete. For instance the rebar corroding at higher rate, the CR predicted by GPT is very close to the CR by weight-loss method whereas it is 20 times less by EIST. In the case of passive state of rebar, the CR predicted by EIST is very close to weight-loss method whereas GPT predicts 10 times higher. In aged structures, the change in microstructure of concrete and loss of moisture from the concrete make the potential of rebar and resistivity of concrete more unpredictable and mislead the status of rebar embedded inside the concrete.

UR - http://www.scopus.com/inward/record.url?scp=78049457420&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78049457420&partnerID=8YFLogxK

U2 - 10.1007/s12205-010-1023-6

DO - 10.1007/s12205-010-1023-6

M3 - Article

AN - SCOPUS:78049457420

VL - 14

SP - 867

EP - 877

JO - KSCE Journal of Civil Engineering

JF - KSCE Journal of Civil Engineering

SN - 1226-7988

IS - 6

ER -