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10118 Mathematical Modeling Applied to Control of Corrosion of Reinforcement Bars in Concrete

Picture for 10118 Mathematical Modeling Applied to Control of Corrosion of Reinforcement Bars in Concrete
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Product Number: 51300-10118-SG
ISBN: 10118 2010 CP
Author: A. Peratta, J. Baynham, and R. Adey
Publication Date: 2010
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$20.00
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The most commonly recognized causes of de-passivation of reinforcing steel in concrete structures in industrial environments are chloride penetration and loss of alkalinity due to carbonization, but in addition stray current may be a cause of localized accelerated corrosion. In several cases including roadwork structures, bridges, retaining walls and marine structures, cathodic protection has proven to be an effective means to control corrosion. Cathodic protection of reinforcement bars in concrete may be provided by sacrificial, impressed current, or combined systems. The performance of a CP system will be critically affected by the level of contamination with chlorides- which affects both the conductivity of the concrete and the potentials required to provide protection. Performance of a system will also be critically affected by stray currents from nearby power supplies, which in the worst case can promote corrosion. However, the design of effective CP systems in new builds or retrofits is sometimes difficult to achieve due to lack of practical experience and the sometimes significant complexity of the structure design and access. In this field, computational modeling can provide important information on the effectiveness and feasibility of corrosion control solutions.

The aim of this paper is to present a modeling approach for cathodic protection systems applied to steel reinforced concrete structures. The approach uses boundary element techniques, which firstly allow simplified representation of the effects of contamination by using a layered representation of the concrete, and which secondly allow simplified determination of the effects of possible stray current from nearby power sources.

Keywords: Simulation, mathematical modeling, CP, stray current, rebar, concrete
The most commonly recognized causes of de-passivation of reinforcing steel in concrete structures in industrial environments are chloride penetration and loss of alkalinity due to carbonization, but in addition stray current may be a cause of localized accelerated corrosion. In several cases including roadwork structures, bridges, retaining walls and marine structures, cathodic protection has proven to be an effective means to control corrosion. Cathodic protection of reinforcement bars in concrete may be provided by sacrificial, impressed current, or combined systems. The performance of a CP system will be critically affected by the level of contamination with chlorides- which affects both the conductivity of the concrete and the potentials required to provide protection. Performance of a system will also be critically affected by stray currents from nearby power supplies, which in the worst case can promote corrosion. However, the design of effective CP systems in new builds or retrofits is sometimes difficult to achieve due to lack of practical experience and the sometimes significant complexity of the structure design and access. In this field, computational modeling can provide important information on the effectiveness and feasibility of corrosion control solutions.

The aim of this paper is to present a modeling approach for cathodic protection systems applied to steel reinforced concrete structures. The approach uses boundary element techniques, which firstly allow simplified representation of the effects of contamination by using a layered representation of the concrete, and which secondly allow simplified determination of the effects of possible stray current from nearby power sources.

Keywords: Simulation, mathematical modeling, CP, stray current, rebar, concrete
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