- 著者
-
HASEGAWA Mitsuhiro
IMANO Makoto
YAMAMOTO Takanori
KIDA Tetsukazu
KONDO Tsutomu
SUDO Makoto
KATO Kiyoshi
KATO Naoki
TAKANO Makiko
- 出版者
- 日本学術会議 「機械工学委員会・土木工学・建築学委員会合同IUTAM分科会」
- 雑誌
- Theoretical and Applied Mechanics Japan (ISSN:13480693)
- 巻号頁・発行日
- vol.55, pp.41-50, 2006
The fundamental reason of deterioration is the repetitional scaling of the surface layer; further, it has been basically analyzed that the freezing and thawing actions make concrete neutralize from the outside by virtue of the environmental contact water. The wet-dry action is one of the principal deterioration causes. It has been already understood that both actions contribute to the neutralizing acceleration of concrete. The present paper particularly deals with the quantification of the concentration dilution of pore solution and the neutralization of the matrix of concrete, from the viewpoint of the potential Hydrogen (pH) range of general environmental water; in addition, it has been clarified that the equilibration-concentration and the neutralized depth can be obtained, assuming to be the semipermeable membrane on the shell interface. The critical thickness as to the hypothetical thick shell with the through microcrack has been derived for the first time; thus, finally the mechanical cover can be perfectly neutralized due to the approximately fifty cycles of water-microcirculation.