Comparative Half Cell Potential and Concrete Resistivity Corrosion Probability Assessment of Embedded Coated Steel Reinforcement in Concrete Accelerated Environment

2018 ◽  
Vol 9 (5) ◽  
pp. 141-159
Author(s):  
Charles Kennedy ◽  
Philip Kpae. F. O. ◽  
Watson Oruene
Keyword(s):  
Steel Reinforcement ◽  
Coated Steel ◽  
Probability Assessment ◽  
Half Cell ◽  
Cell Potential ◽  
Concrete Resistivity

scholarly journals Investigation on the Corrosion of Coated Steel Plates with Impact Defect using Divided Steel Plates

2018 ◽  
Vol 4 (1) ◽  
pp. 58 ◽  
Author(s):  
Marish S. Madlangbayan ◽  
Nobuaki Otsuki ◽  
Takahiro Nishida ◽  
Tsuyoshi Saito
Keyword(s):  
Polarization Resistance ◽  
Steel Plates ◽  
Coated Steel ◽  
Test Results ◽  
Nacl Solution ◽  
Half Cell ◽  
Cell Potential ◽  
Polarization Behavior ◽  
The Impact ◽  
Macrocell Corrosion

A method utilizing divided steel plates was used to investigate the corrosion of coated steel plates with impact defect while continuously submerged in 3% NaCl solution. The polarization behavior of circular divided steel plates was first compared to that of undivided ones. Half-cell potential and polarization resistance results show similar trend in divided and undivided form especially at the later stages of exposure. The method of using circular divided steel plates was then used to monitor the macrocell as well as microcell corrosion in coated steel plates induced with defect. The test results show that the defect causes macrocell corrosion to occur between the defect and sound portions. The impact defect also caused the reduction in the polarization resistance and consequently higher microcell corrosion at the neighbouring sound coated portions.

Effect of Interrupting Electricity Period on Electrochemical Chloride Extraction of Reinforced Concrete

2015 ◽  
Vol 754-755 ◽  
pp. 342-347
Author(s):  
Mien Van Tran ◽  
Dong Viet Phuong Tran ◽  
Mohd Mustafa Al Bakri Abdullah
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Rate ◽  
Current Density ◽  
Concrete Structure ◽  
Chloride Concentration ◽  
Steel Reinforcement ◽  
Reinforced Concrete Structure ◽  
Half Cell ◽  
Cell Potential ◽  
Electrochemical Chloride Extraction

Electrochemical chloride extraction – ECE is an effective method to rehabilitate reinforced concrete structure, which has been corroded. This study investigated concentration of chloride remained in concrete and half-cell potential of the steel reinforcement after ECE using interrupting period of electricity current. Efficiency of ECE using Ca (OH)2was surveyed with two current density of 0.5 and 1A/m2. In this study, ECE treatment was proceeded intermittently in approximately 8 weeks. Results pointed out that chloride concentration decreased to 30 – 60% significantly, especially at in the vicinity of reinforcing steel. Simultaneously, half-cell potential of the steel reinforcement after 4 weeks halted treatment stabilizes in low-corrosion rate.

scholarly journals Corrosion Mitigation of Reinforcement in Concrete using Magnesium Anodes

2019 ◽  
Vol 8 (4) ◽  
pp. 1950-1956
Keyword(s):  
Relative Humidity ◽  
Cathodic Protection ◽  
Steel Reinforcement ◽  
Negative Potential ◽  
The Other ◽  
Half Cell ◽  
Cell Potential ◽  
Significant Drop ◽  
Design Life ◽  
Magnesium Anode

In the present work, an attempt has been made for the cathodic protection of structural steel reinforcement using Magnesium anode. For the same, two slabs were casted using steel reinforcement mat of 10 mm diameter. First slab was casted with cement containing 3.5% NaCl by weight of cement was added, while the other was casted without NaCl. Magnesium anode with design life of three years was centrally placed in both the cases. Half-cell potential readings were taken on regular basis along with temperature and relative humidity. It could be concluded that the negative potential in both cases increased towards the center, i.e. towards the anode. Further, significant drop in negative potential could be observed in the slabs with increase in duration of cathodic protection. Relative humidity and temperature were found to play major role in HCP readings.

scholarly journals Methodology for Assessing the Probability of Corrosion in Concrete Structures on the Basis of Half-Cell Potential and Concrete Resistivity Measurements

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Lukasz Sadowski
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Electrochemical Techniques ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Half Cell ◽  
Reinforced Concrete Slab ◽  
Cell Potential ◽  
Potential Measurement ◽  
Concrete Resistivity

In recent years, the corrosion of steel reinforcement has become a major problem in the construction industry. Therefore, much attention has been given to developing methods of predicting the service life of reinforced concrete structures. The progress of corrosion cannot be visually assessed until a crack or a delamination appears. The corrosion process can be tracked using several electrochemical techniques. Most commonly the half-cell potential measurement technique is used for this purpose. However, it is generally accepted that it should be supplemented with other techniques. Hence, a methodology for assessing the probability of corrosion in concrete slabs by means of a combination of two methods, that is, the half-cell potential method and the concrete resistivity method, is proposed. An assessment of the probability of corrosion in reinforced concrete structures carried out using the proposed methodology is presented. 200 mm thick 750 mm  ×  750 mm reinforced concrete slab specimens were investigated. PotentialEcorrand concrete resistivityρin each point of the applied grid were measured. The experimental results indicate that the proposed methodology can be successfully used to assess the probability of corrosion in concrete structures.

Quantifying chloride-induced corrosion from half-cell potential

1993 ◽  
Vol 23 (6) ◽  
pp. 1443-1454 ◽  
Author(s):  
R.K. Dhir ◽  
M.R. Jones ◽  
M.J. McCarthy
Keyword(s):  
Half Cell ◽  
Cell Potential ◽  
Chloride Induced Corrosion
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