Study on unusual deterioration of concrete servicing in acid environment

本文研究了酸性环境下混凝土的异常劣化问题。首先对各种混凝土的劣化部位进行了检查。选取T坝和S坝作为异常劣化部位的代表。特别根据S坝廊道和T坝输水方式的调查结果，推测了溃决机理。作为结果，揭示了以下内容。普通大坝混凝土也会发生硫酸腐蚀。在坝上面向堰塞湖的坝体，最好采用与排水、温泉区混凝土相同的方法使用抗硫酸盐水泥。

In this study, unusual deterioration of concrete servicing in acid environment was investigated. The deterioration sites of various kind of concrete were inspected at first. Then T dam and S dam were selected as the representation of unusual deterioration site. Especially, the deterioration mechanism was presumed from the results of an investigation in the corridor of S dam and the watering way of T dam. As the results, the followings were revealed. Some sulfuric acid deteriorations could arise in common dam concrete. On upper side of dam which faces the dam lake, the sulphate reisting cement should be better to be used in the same way as the concrete in drain and hot spring area.