抄録
This research showed the expansion behavior of prestressed concrete beam deteriorated by alkali-silica reaction under long term exposure test by the follow-up survey over about four years. The main results are as follows. Expansion of the cracks became remarkable at the time of the high temperature of summer, and it was almost changeless in winter. Compared with the strain of concrete surface of upper edge of axial direction, strain of vertical direction and upper edge of right-angle direction was large. The strain of the stirrups exceeded a yield strain greatly. The compressive strength of the test piece of concrete deteriorated to about 80% of the maximum, and the elastic modulus deteriorated to about 30% of the maximum.
