Case Of Damage - Reinforced Concrete Deck -
Deterioration process of RC Deck
Reinforcement of Concrete decking
- Setting steel plate
- Putting resin
Case Of Damage - ASR -
ASR (Alkali-Silica Reaction)
In 1980's, Alkali-Silica Reaction was identified in Japan
- Hanshin expressway
- 1982: ASR was identified on Reinforced Concrete-Pier
- 1985: Maintenance Manual for ASR
- 1989: Surface Coating Manual
ASR is a reaction between highly alkaline cement paste and reactive silica in aggregates.
Concrete Core Observation
ASR forms a swelling gel that grows in volume in contact to water.
It exerts an expansive pressure inside the material and causes strength loss of concrete.
Reinforcement by Lining Steel Plate
Reinforcement by Lining Carbon Fiber Sheet
Case Of Damage Fatigue of steel structures
Preventive Measures against Crack Failure
We repair them with various proper methods.