PROBLEM

Seashore sand (NaCl content is 2-3 kg/m3 [0.12-0.19 lbs/ft3]) was used in the concrete for construction of the bullet train bridges. Water to concrete ratios exceeded 70%, which created poor quality concrete. The structure exhibited numerous spalled areas with exposed corroded rebar. Not only did the spalled and corroded areas need repair, but they also needed to be protected from further corrosion.

APPLICATION

The MCI® products selected for this project were:
• MCI®-2023: 32.90 kg (72.5 lbs)
• MCI®-2020: 31.02 kg (68.4 lbs)
• MCI®-2005: 3.69 kg (8.1 lbs)
(mixed with Tough Ace Emulsion produced by LION Co.)

CONCLUSION

More than sixty treatment products developed by fifteen manufacturers were examined for the project. Out of the systems and products tested, Cortec® MCI® products offered the highest performance levels and were chosen for corrosion control of the Bullet Train structures.

PRODUCTS

MCI®-2005
MCI®-2020
MCI®-2023