Rehabilitation Design and Construction Method for Concrete Piers Damaged by ASR
By Y.Okuda, K.Matsumoto, T.Komura and T.Minato
Concrete Journal, Vol.36, No.9, Sept. 1998
- Synopsis
- In the Hokuriku region, de-icing salts have been increasingly used especially on the pavement of bridges in winter. As a result, there is a risk of combined deterioration, due to both the chloride induced corrosion of steel reinforcement in concrete and the cracking caused by alkali-sillica reaction (ASR) in concrete piers. In the rehabilitation of ASR damaged concrete piers, the influence of de-icing salts on the deterioration of concrete was investigated in detail. Based on the results of the laboratory and field test, the PC confined method which uses PC wires as a hoop reinforcement, has been applied as a seismic strengthenimg and rehabilitation one to the ASR damaged concrete piers in the Kumakigawa bridge in Ishikawa Prefecture. This paper describes the survey for ASR damaged concrete piers, and their rehabilitation design and construction methods.
- Keywords:
- alkali-silica reaction, de-icing salts, rehabilitation, seismic design capacity, prestressing force, confined effect
