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98644 CORROSION PROTECTION OF NEW REINFORCED CONCRETE STRUCTURES IN AGGRESSIVE ENWRONMENTS

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Product Number: 51300-98644-SG
ISBN: 98644 1998 CP
Author: Steven F. Daily, Kevin Kendell
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Concrete structures located in aggressive environments where high temperatures and high chloride levels exist in both natural soils and water are subject to premature deterioration from corrosion of the reinforcement. Traditional methods of corrosion protection, such as concrete admixtures and passive barrier systems, may not be sufficient to provide the level of corrosion control needed for the intended design life. As a solution to this problem the use of cathodic protection (or cathodic prevention as it is called) at the time of construction is proposed. Alhough cathodic protection has been used as a rehabilitation method on existing salt-contaminated concrete structures for over 20 years, its application to new reinforced concrete structures is relatively new. It has been shown, however, that the cathodic current density necessary to maintain a passive layer on the reinforcing steel before the concrete is contaminated with chlorides is relatively low and that the chloride ion tends to migrate towards the anode. The application of cathodic prevention dtiring new construction can have lower initial cost than conventional methods and significant long-term benefits. Anode materials such as catalyzed titanium ribbon, which are cast monolithically in the new concrete, can provide effective corrosion control for the life of the structure (i.e. >75 years). Keywords: Anode, cathodic prevention, cathodic protection, concrete, corrosion, reinforcing steel
Concrete structures located in aggressive environments where high temperatures and high chloride levels exist in both natural soils and water are subject to premature deterioration from corrosion of the reinforcement. Traditional methods of corrosion protection, such as concrete admixtures and passive barrier systems, may not be sufficient to provide the level of corrosion control needed for the intended design life. As a solution to this problem the use of cathodic protection (or cathodic prevention as it is called) at the time of construction is proposed. Alhough cathodic protection has been used as a rehabilitation method on existing salt-contaminated concrete structures for over 20 years, its application to new reinforced concrete structures is relatively new. It has been shown, however, that the cathodic current density necessary to maintain a passive layer on the reinforcing steel before the concrete is contaminated with chlorides is relatively low and that the chloride ion tends to migrate towards the anode. The application of cathodic prevention dtiring new construction can have lower initial cost than conventional methods and significant long-term benefits. Anode materials such as catalyzed titanium ribbon, which are cast monolithically in the new concrete, can provide effective corrosion control for the life of the structure (i.e. >75 years). Keywords: Anode, cathodic prevention, cathodic protection, concrete, corrosion, reinforcing steel
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