| Abstract |
| Expansion agents of cable grout in post-tension concrete structure were used to improve the corrosion properties of steel cable. The corrosion behavior of cable grout in 3 wt.% NaCl solution was investigated by accelerated corrosion test using potentiostatic test and electrochemical impedance spectroscopy (EIS) at room temperature. In this paper, the corrosion resistance of the pozzolanic admixture and nonmetallic expansion agent mixture was compared with that of aluminum powder expansion agent. Results obtained from accelerated corrosion test showed that pozzolanic admixture reduced diffusion and permeability to chloride ions, and increased the corrosion resistance of cable grout. The cable embedded in grout with aluminum powder expansion agent was more corroded than that in grout with nonmetallic expansion agent. The EIS results revealed that (Rfilm + Rct) value of grout with pozzolanic admixture and nonmetallic expansion agent mixture was higher than the value of grout with aluminum powder expansion agent after cracking. |
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| Key Words |
| cable grout, corrosion resistance, potentiostatic test, EIS, chloride |
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