Abstract
The purpose of the experiments in this paper is to clarify the physical and dynamic properties of the concrete at seventy years age which was suffered from atomic bombing at 1945 in Hiroshima. The compressive strength and Young's modulus of the concrete by the side of an atomic bombed place showed the value lower than the other concrete specimens. The coefficient of water absorption of the concrete was very high and it became clear that there was almost no freeze dissolution resistance. And neutralization of concrete was progressing very unusually. Moreover, as concerns the concrete by the side of an atomic bombed place, neutralization from the outdoors side was higher than that of inner side. It is considered to have influenced the above-mentioned examination result greatly that especially concrete temperature rose in 500 degrees C-750 degrees C. The necessity for performing carefully the maintenance of the RC building which was suffered from atomic bombing was shown by this research.
