Abstract
The durability of concrete exposed to cold climate for 50-several years was evaluated by various methods. As the result, it was recognized that the compressive strength of core specimens were remarkable development from 1.8 to 2.0 times compared to that of specimens cured for 28 days at constant temperature in water at the construction. It was originated from that the cement was coase and was consisted of many belites. The quality of concrete was correspondent to manufacturing performance of the precast concrete, judging from the average carbonation velocity coefficient, and it was proven that the good construction was carried out. The degradation by carbonation and so on had stopped only in the surface layer.
