2015 年 15 巻 3 号 p. 225-230
On March 11, 2011, a very big earthquake occurred in the Tohoku district in Japan. As a result, a large amount of tsunami sludge was generated and radiation contamination due to Fukushima nuclear disaster also became a serious problem. Therefore, it became necessary to be stored the radioactive pollutant at temporary storehouses after the decontamination of the radiation-contaminated waste and soil. However, the embankment made of ordinary soils had low strength property due to rainfall and low quake-resistant ability; the rainwater seepage control sheets were also affected by the ultraviolet light. Therefore, further improvements on these solutions were required. In this study, we focused on the application of Fiber-cement-stabilized soil method to the cover soil for radiation-contaminated soil. Moreover, the setting method of optimum conditions for creating Fiber-cement-stabilized soil made of tsunami sludge was developed based on the compaction characteristics of the tsunami sludge. The advantage of the developed method was validated by laboratory soil test. As a result, the developed method was useful for easily-setting the optimum condition for creating the Fiber-cement-stabilized soil by recycling the tsunami sludge.
