scholarly journals Cathodic protection in reinforced concrete structures affected by macrocell corrosion: a discussion about the significance of the protection criteria

2017 ◽  
Vol 2 ◽  
pp. 27-32 ◽  
Author(s):  
Stephane Laurens ◽  
Raoul Francois
Keyword(s):  
Reinforced Concrete ◽  
Cathodic Protection ◽  
Concrete Structure ◽  
Polarization Current ◽  
Reinforced Concrete Structure ◽  
Concrete Wall ◽  
Depolarization Current ◽  
Impressed Current ◽  
Macrocell Corrosion ◽  
Control Corrosion

Cathodic protection is a technique that has been used to control corrosion and increase the service life of reinforced concrete structure. Standards as EN ISO 12696 give protection criteria for both impressed current and sacrificial anodes techniques, based on potential value or decay during a depolarization sequence. The polarization (current ON) and depolarization (current OFF) is experimentally studied on a corroded concrete wall thanks to six references electrodes and compared to a time-dependent modelling using FEM software COMSOL Multiphysics. Both experimental and numerical results show significant differences in the time response according to electrode location. This conclusion indicates that the concept of protection criteria defined by the standards is not suitable to assess the efficiency of cathodic protection applied to reinforced concrete structure.

A Study on Cathodic Protection Current Density on Rebar in Onshore Concrete Structure of Persian Gulf

2013 ◽  
Vol 850-851 ◽  
pp. 270-273
Author(s):  
Ya Ping Wang ◽  
Da Jing Fang ◽  
Jun Huang ◽  
Er Bu Shen
Keyword(s):  
Reinforced Concrete ◽  
Current Density ◽  
Cathodic Protection ◽  
Persian Gulf ◽  
Concrete Structure ◽  
Reinforced Concrete Structure ◽  
Marine Corrosion ◽  
Impressed Current ◽  
Corrosion Of Steel ◽  
Control Corrosion

The service life of reinforced concrete structure has been greatly influenced by corrosion of steel, however, impressed current cathodic protection (ICCP) system is able to control corrosion of steel, especially which is corroded by chloride along the coast areas. In this work protection current and related technical parameter in both intake and outfall structure has been investigated in the seawater cooling structure along the coast area of Persian Gulf in Saudi Arabia. The most suitable protection current density provided by ICCP system is 5mA/m2for reinforced concrete structure in the severe marine corrosion area in Middle East.

Test and Study on Impact of Corrosion on Bond Force between Steel and Concrete

2010 ◽  
Vol 36 ◽  
pp. 176-181
Author(s):  
Xian Feng He ◽  
Shou Gang Zhao ◽  
Yuan Bao Leng
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Rate ◽  
Concrete Structure ◽  
Steel Corrosion ◽  
Reinforced Concrete Structure ◽  
Bond Force ◽  
Steel Bars ◽  
Protection Layer ◽  
Corrosion Of Steel ◽  
The Impact

The corrosion of steel will have a bad impact on the safety of reinforced concrete structure. In severe cases, it may even be disastrous. In order to understand the impact of steel corrosion on the structure, tests are carried out to study corrosion and expansion rules of steel bars as well as the impact rules of corrosion on bond force between steel and concrete. The results show that wet and salty environment will result in steel corrosion; relatively minor corrosion will not cause expansion cracks of protection layers; when steel rust to a certain extent, it will cause cracks along the protection layer; when there exists minor corrosion in steel and the protection layer does not have expansion cracks, the bond force is still large and rapidly decreases as the corrosion rate increases.

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