• Magazine of the Korea Concrete Institute
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• v.6 no.6
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• pp.173-179
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• 1994

Epoxy coated bars protecting reinforcing bars from corrosion and enhancing durability of reinforced concrete structures are tested to evaluate corrosion protection properties. Tests are performed based on the relevant sta.ndards of KS and ASTM, such as chenical resistance, salt water spray, salt crock test and chloride ermeability test. with the main varlable of the coating thlckness. Test results show good chemical protection property and chloride permeability. The results of the salt water spray and the salt crock test show that epoxy coating well protects the reinforcing bars from corrosion, cornparing to the biack bars without epoxy coatmg. However, several spots on the coated bars are rusted at the pinholes or un the bars with coating thickness less thar $200{\mu}M$. Special cautions are required i n the process of blast cleanmg when applying the usion-bonded epoxy coating.

• Proceedings of the Korea Concrete Institute Conference
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• 1997.04a
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• pp.241-247
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• 1997

Reinforced concrete is in general known as high durability construction material under normal enviroments due to strong alkalinity of cement. Marine and harbour concrete as well as concrete mixed with seasand for fine aggregate are exposed to detrimental saltwater wich cause to accel-eate corrosion of reinforcing steel in concrete. If corrosion resistance of concrete gets to weaken due to carbonation and crack in cover concrete, concrete durability rapidly decrease by corrosion of reinforcement steel embedded in concrete. This research is to investigate basic physical properties of various corrosion inhibitors and to evaluate their corrosion resistance in concrete mixed with seasand. The object of this study is develop appropriate corrosion protection systems so as to enhance the durability of concrete.

• Proceedings of the Korea Concrete Institute Conference
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• 2003.05a
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• pp.1081-1090
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• 2003

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.1065-1068
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• 2008

Marine bridges are readily deteriorated due to the exposure to marine environment. The concrete deterioration occurred by corrosion of steel in concrete is mainly relevant to chloride in seawater. Chloride ions penetrate through porous concrete, and then reach to the reinforcing steel, and finally corroded them. The corrosion by-products(rusts) increase the volume as much as 6 to 10 times of origin steel. this creates expanding pressure and tensile stress, which cause the structures cracking and spalling. Sometimes the rebar corrosion is accelerated, and then collapsed catastrophically. In order to prevent corrosion damage, it is important to understand well regarding the reason of concrete corrosion, the quantification of its damage, and protection method/system to stop or to mitigate the corrosion. In this study, slab specimens were fabricated to evaluate the effect of cathodic protection which was simulated to marine bridges, and/or port structures. Zn-mesh sacrificial anode has been applied as a chathodic protection system and accelerated test conditions, i.e. temperature and salt concentration have been used in this study.

• Corrosion Science and Technology
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• v.11 no.6
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• pp.242-246
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• 2012

This measurement represents the effectiveness of sacrificial anode cathodic protection (SACP) system in a coastal bridge structure. To verify the cathodic protection (CP) effect, the monitoring sensor (DMS-100) that could measure potential, corrosion rate, current, concrete resistivity, and temperature was embedded. The measurement conducted for three years after CP system was installed. Specifically, due to the fact that fresh water and sea water was repeated in the bridge structure, this bridge structure presented special CP behavior. Measurement factors were CP potential, CP current, concrete resistivity, and depolarization potential. In addition, visual inspection was also carried out. As a result of current and depolarization measurement, CP system was well activated in most piers.

• Proceedings of the Korea Concrete Institute Conference
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• 2000.04a
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• pp.821-826
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• 2000

Reinforced concrete is in general known as high durability construction material under normal environments due to strong alkalinity of cement. Marine concrete specimens in the tidal and the splash zone at seashore have been exposed to cyclic wet and dry saltwaters which cause to accelerate corrosion of reinforcing steel in concrete. If corrosion resistance of concrete gets to weaken de to carbonations and cracks in cover concrete, furthermore, concrete durability rapidly decreases by the corrosion of reinforcement steel embeded in concrete. The objective of this study is to develop appropriate corrosion protection systems of marine concrete so as to enhance the durability of concrete by establishing pertinent cover depth of concrete and by using corrosion inhibitors as concrete admixtures.

• Proceedings of the Korea Concrete Institute Conference
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• 1997.10a
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• pp.299-302
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• 1997

Generally the corrosion expansion of the steel due to outdoor corrosive environmental factor brings about serious problem on the durability of concrete structures. It is the purpose of this study to see whether adapted sacrificial anode method is effective or not. from the experimental results. the potential of steel in concrete in case of adapting the sacrificial anode method satisfies protection standard value (less than -850mV vs CSE).

• Proceedings of the Korea Concrete Institute Conference
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• 1999.10a
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• pp.755-758
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• 1999

Reinforced concrete is in general known as high durability construction material under normal environments due to strong alkalinity of cement. Marine and harbour concrete in the tidal and the splash zone at seashore are exposed to cyclic wet and dry saltwaters which cause to accelerate corrosion of reinforcing steel in concrete. If corrosion resistance of concrete gets to weaken due to carbonations and cracks in cover concrete, furthermore, concrete durability rapidly decreases by corrosion of reinforcement steel embedded in concrete. The objective of this study is to develop appropriate corrosion protection systems so as to enhance the durability of concrete by controlling the cover depth of concrete and by using corrosion inhibitors as concrete admixtures.

• Proceedings of the Korea Concrete Institute Conference
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• 2001.05a
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• pp.345-350
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• 2001

Reinforced concrete is, in general, known as a high durability material due to a strong alkalinity of cement. Probable concrete cracks could incur steel corrosion of RC structures and then could easily deteriorate the concrete durability, which can be fully secured by a systematic quality control for the construction of concrete structures. For the corrosion protection of reinforcing steels in concrete, however, current design specifications of concrete cover depth do not in-depth consider the effect of the cracks as well as the chloride content of RC structures. Therefore, appropriate provisions for concrete cover depth should be coded by considering the influence of concrete cracks on the corrosion of reinforcing steels. The objective of this research is to investigate pertinent cover depth, which can prohibit rebar corrosion, on the basis of experimental corrosion measurements of reinforcing steels on crack characteristics such as the width, depth and frequency of concrete cracks.

• Proceedings of the Korea Concrete Institute Conference
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• 1997.04a
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• pp.191-196
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• 1997

Steel is the most used as materials for construction and corrosion expansion of steel due to outdoor corrosive environmental factor bring serious problem on the durability of concrete structures time after time. It is the purpose of this study to see whether it is effective of not, when sacrificial anode method is adapted. Indoor accelerated corrosion testing was carried out to see its effective in a short term. From the mid result, potential of steel in concrete in case of adapting sacrifice anode method satisfacts protection standard value (less than-850mV vs CSE), therefore sacrificial anode method is considered as a proper protection steps against corrosion of steel.