Spatial Characterisation of Chloride-induced Corrosion of Bars in Concrete

L. Llano, M. Imran Rafiq, Marios Chryssanthopoulos

Research output: Chapter in Book/Conference proceeding with ISSN or ISBNConference contribution with ISSN or ISBNResearchpeer-review

Abstract

Chloride induced corrosion, caused primarily by de-icing salts or salt spray in marine environments, is one of the most common deterioration processes in reinforced concrete. It often causes a localized loss of section, known as pitting, which can lead to a significant reduction of the structure’s service life. In order to predict the impact of this phenomenon on the mechanical properties of the reinforcing bars in concrete a thorough analysis of its characteristics is needed. At present, most of the models found in literature describe uniform corrosion and those that do address localized corrosion focus on a simplified definition of the reduced cross-sectional area of corroded rebars without due attention to physical characteristics and spatial variability. This may be attributed to the limitations of current non-automated and largely heuristic methods used in evaluating the corrosion characteristics on the surface of reinforcement. Automation of the corrosion measurement method would lead to the development of comprehensive corrosion models considering both systematic and random features of the deterioration process. In this paper, experimental results from corroded bars are processed using 3D scanning techniques and characterised using spatial analysis tools, thus preparing the ground for probabilistic corrosion modelling based on random field concepts.
Original languageEnglish
Title of host publicationAssessment, Upgrading and Refurbishment of Infrastructures
Place of PublicationZurich
PublisherInternational Association for Bridge and Structural Engineering
Number of pages8
ISBN (Print)9783857481239
Publication statusPublished - 2013
EventIABSE Conference - Rotterdam, Netherlands
Duration: 6 May 20138 May 2013

Publication series

NameIABSE report
Volume99

Conference

ConferenceIABSE Conference
CountryNetherlands
CityRotterdam
Period6/05/138/05/13

Fingerprint

Concretes
Corrosion
Snow and ice removal
Deterioration
Salts
Heuristic methods
Pitting
Service life
Reinforced concrete
Reinforcement
Automation
Scanning
Mechanical properties

Keywords

  • Chloride induced corrosion
  • reinforced concrete
  • reinforcement bars and spatial variability

Cite this

Llano, L., Rafiq, M. I., & Chryssanthopoulos, M. (2013). Spatial Characterisation of Chloride-induced Corrosion of Bars in Concrete. In Assessment, Upgrading and Refurbishment of Infrastructures (IABSE report; Vol. 99). Zurich: International Association for Bridge and Structural Engineering.
Llano, L. ; Rafiq, M. Imran ; Chryssanthopoulos, Marios. / Spatial Characterisation of Chloride-induced Corrosion of Bars in Concrete. Assessment, Upgrading and Refurbishment of Infrastructures. Zurich : International Association for Bridge and Structural Engineering, 2013. (IABSE report).
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Llano, L, Rafiq, MI & Chryssanthopoulos, M 2013, Spatial Characterisation of Chloride-induced Corrosion of Bars in Concrete. in Assessment, Upgrading and Refurbishment of Infrastructures. IABSE report, vol. 99, International Association for Bridge and Structural Engineering, Zurich, IABSE Conference, Rotterdam, Netherlands, 6/05/13.

Spatial Characterisation of Chloride-induced Corrosion of Bars in Concrete. / Llano, L.; Rafiq, M. Imran; Chryssanthopoulos, Marios.

Assessment, Upgrading and Refurbishment of Infrastructures. Zurich : International Association for Bridge and Structural Engineering, 2013. (IABSE report; Vol. 99).

Research output: Chapter in Book/Conference proceeding with ISSN or ISBNConference contribution with ISSN or ISBNResearchpeer-review

TY - GEN

T1 - Spatial Characterisation of Chloride-induced Corrosion of Bars in Concrete

AU - Llano, L.

AU - Rafiq, M. Imran

AU - Chryssanthopoulos, Marios

PY - 2013

Y1 - 2013

N2 - Chloride induced corrosion, caused primarily by de-icing salts or salt spray in marine environments, is one of the most common deterioration processes in reinforced concrete. It often causes a localized loss of section, known as pitting, which can lead to a significant reduction of the structure’s service life. In order to predict the impact of this phenomenon on the mechanical properties of the reinforcing bars in concrete a thorough analysis of its characteristics is needed. At present, most of the models found in literature describe uniform corrosion and those that do address localized corrosion focus on a simplified definition of the reduced cross-sectional area of corroded rebars without due attention to physical characteristics and spatial variability. This may be attributed to the limitations of current non-automated and largely heuristic methods used in evaluating the corrosion characteristics on the surface of reinforcement. Automation of the corrosion measurement method would lead to the development of comprehensive corrosion models considering both systematic and random features of the deterioration process. In this paper, experimental results from corroded bars are processed using 3D scanning techniques and characterised using spatial analysis tools, thus preparing the ground for probabilistic corrosion modelling based on random field concepts.

AB - Chloride induced corrosion, caused primarily by de-icing salts or salt spray in marine environments, is one of the most common deterioration processes in reinforced concrete. It often causes a localized loss of section, known as pitting, which can lead to a significant reduction of the structure’s service life. In order to predict the impact of this phenomenon on the mechanical properties of the reinforcing bars in concrete a thorough analysis of its characteristics is needed. At present, most of the models found in literature describe uniform corrosion and those that do address localized corrosion focus on a simplified definition of the reduced cross-sectional area of corroded rebars without due attention to physical characteristics and spatial variability. This may be attributed to the limitations of current non-automated and largely heuristic methods used in evaluating the corrosion characteristics on the surface of reinforcement. Automation of the corrosion measurement method would lead to the development of comprehensive corrosion models considering both systematic and random features of the deterioration process. In this paper, experimental results from corroded bars are processed using 3D scanning techniques and characterised using spatial analysis tools, thus preparing the ground for probabilistic corrosion modelling based on random field concepts.

KW - Chloride induced corrosion

KW - reinforced concrete

KW - reinforcement bars and spatial variability

M3 - Conference contribution with ISSN or ISBN

SN - 9783857481239

T3 - IABSE report

BT - Assessment, Upgrading and Refurbishment of Infrastructures

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Llano L, Rafiq MI, Chryssanthopoulos M. Spatial Characterisation of Chloride-induced Corrosion of Bars in Concrete. In Assessment, Upgrading and Refurbishment of Infrastructures. Zurich: International Association for Bridge and Structural Engineering. 2013. (IABSE report).