水道施設におけるコンクリートの劣化現象

概要

論文の詳細を見る
The structures for water supply facilities are relatively old, and sometimes they have been used for about 100 years since their construction. Nevertheless, most of them are still in a good usage state as a whole, although there are some deteriorating local places. The characteristics of water supply facilities are follwing ; (1)free residual chlorine always acts, (2) chlorine content is relatively higth in a water reservoir because the specific value of chlorine is controlled at a faucet, (3) a hydraulic pressure always acts, and (4) water always flows on the structure. Therefore, the residual free chlorine, hydraulic pressure and water stream among others are considered as the main deterioration factors. In this study, these deterioration factors are discussed from the present state survey and some experiments. Consequently, it became clear that these factors have an important infrluence on the deterioration. Although the deterioration is reported as a process of neutralization, it is accompanied with strength reduction. Therefore, the deterioration phenomenon in this study is different from carbonation. That is, it is caused by dissolution into water of silica and calcium in the concrete and increase of pore volume.
社団法人日本材料学会の論文
1991-09-15