TY - GEN
T1 - Experimental study on anticorrosive effect of new developed sacrificial point anode method
AU - Koda, Maki
AU - Aoyama, Toshiyuki
AU - Yamamoto, Daisuke
AU - Hamada, Hidenori
PY - 2017/1/1
Y1 - 2017/1/1
N2 - A new sacrificial anode method was developed in this study. This sacrificial point anode method has three main features: the anode raw material is zinc, material covering the anode is mortar containing a lithium nitrite solution, and site casting is possible using a system to inject mortar on site. This method was applied to a 36-year-old RC beam that had been exposed to marine environment conditions for more than 20 years. Cracks due to steel bar corrosion were found especially on the tension side. Moreover, corrosion (rust and loss of cross-section) of steel bars embedded in the RC beam was confirmed by a partial chipping survey. After six holes 30 mm in diameter were drilled in the RC beam, this point anode was set in a position of 50 mm from the tensile steel bar, and a special mortar was injected into the hole. After this method was applied, the condition of steel bars in the RC beam was measured with an electrochemical measurement method such as electric current, potential, 24-hour depolarization, anodic polarization curve, and polarization resistance. From corrosion current density evaluated by both anodic polarization curve and polarization resistance after exposure in dry conditions for 20 months, it was confirmed that corrosion was prevented on steel bars.
AB - A new sacrificial anode method was developed in this study. This sacrificial point anode method has three main features: the anode raw material is zinc, material covering the anode is mortar containing a lithium nitrite solution, and site casting is possible using a system to inject mortar on site. This method was applied to a 36-year-old RC beam that had been exposed to marine environment conditions for more than 20 years. Cracks due to steel bar corrosion were found especially on the tension side. Moreover, corrosion (rust and loss of cross-section) of steel bars embedded in the RC beam was confirmed by a partial chipping survey. After six holes 30 mm in diameter were drilled in the RC beam, this point anode was set in a position of 50 mm from the tensile steel bar, and a special mortar was injected into the hole. After this method was applied, the condition of steel bars in the RC beam was measured with an electrochemical measurement method such as electric current, potential, 24-hour depolarization, anodic polarization curve, and polarization resistance. From corrosion current density evaluated by both anodic polarization curve and polarization resistance after exposure in dry conditions for 20 months, it was confirmed that corrosion was prevented on steel bars.
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U2 - 10.1007/978-3-319-59471-2_232
DO - 10.1007/978-3-319-59471-2_232
M3 - Conference contribution
AN - SCOPUS:85025605161
T3 - High Tech Concrete: Where Technology and Engineering Meet - Proceedings of the 2017 fib Symposium
SP - 2032
EP - 2040
BT - High Tech Concrete
A2 - Lukovic, Mladena
A2 - Hordijk, Dick A.
PB - Springer International Publishing
T2 - 2017 fib Symposium - High Tech Concrete: Where Technology and Engineering Meet
Y2 - 12 June 2017 through 14 June 2017
ER -
