Numerical Modeling of Cathodic Protection for Sustainable Cementitious Materials Incorporating Rice Husk Ash

Reinforced concrete (RC) structures are widely used in engineering due to their physical, chemical and mechanical characteristics that guarantee good durability. However, one of the main mechanisms of degradation of these structures is associated with the corrosion of the reinforcement, which often...

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Bibliographic Details
Published in:Journal of Advanced Concrete Technology 2024/10/08, Vol.22(10), pp.620-635
Main Authors: Brant, Carlos Alberto Caldeira, Vieira, Amanda Pereira, Simone Louise Delarue Cezar Brasil, Eduardo de Moraes Rego Fairbairn, Santiago, Jose Antonio Fontes, Filho, Romildo Dias Toledo, Jose Claudio de Faria Telles
Format: Article
Language:English
Subjects:
Anodic protection
Ashes
Boundary element method
Carbonation
Cathodic polarization
Cathodic protection
Chloride ions
Corrosion prevention
Curing
Distilled water
Electrical resistivity
Electrochemical potential
Electrode polarization
Ion beams
Mechanical properties
Metal surfaces
Numerical models
Pastes
Reinforced concrete
Rice
Seawater
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Summary:Reinforced concrete (RC) structures are widely used in engineering due to their physical, chemical and mechanical characteristics that guarantee good durability. However, one of the main mechanisms of degradation of these structures is associated with the corrosion of the reinforcement, which often occurs due to carbonation of the concrete and/or the presence of chloride ions. To avoid or mitigate the corrosive process of the reinforcements, one of the most used techniques is the cathodic protection (CP). To design new CP systems or verify existing ones, numerical computational simulations based on the boundary element method (BEM) are used. This work aims to analyze CP systems in RC beams using BEM and experimental input data: resistivity and cathodic polarization curves. The latter are obtained experimentally and represent the relation between the applied current and the electrochemical potential generated on the metal surface. For that, three different environmental conditions were taken into account: after curing (100 days), immersed in distilled water and immersed in seawater. The cementitious materials used were pastes and concretes, without addition of rice husk ash (RHA, reference samples), and with addition of 20% of RHA. The resistivity values decreased after curing in distilled water and in seawater, as expected. The simulations show that the efficiency of the cathodic protection system depends on the impressed current intensity and the geometric arrangement of the anodes.
ISSN:1346-8014
1347-3913
DOI:10.3151/jact.22.620