The 2011 Tohoku Earthquake seriously damaged Miyagi, Iwate and Fukushima prefectures. The tsunami waves devastated the Pacific coast of north-eastern district in Japan. Many cities and towns are still far from reconstruction. Tsunami disaster was one of the grievous disasters in the 2011 Tohoku Earthquake. Total amount of tsunami deposit was estimated around ten million ton in three prefectures. It is necessary to use the tsunami deposit by construction materials in reconstruction works in north-eastern area in Japan.
In this paper, authors proposed a reuse method of tsunami deposit by mixing with concrete rubble. Large amount of concrete rubble and crushed concrete were made from wrecking works of houses and buildings damaged by earthquake. By mixing with crushed concrete rubble, the comparatively uniform grain size distribution of tsunami deposit was improved. The mixed tsunami deposit was applicable as a soil material for construction of embankment or fill material. The best arrangement of tsunami deposit and concrete rubble was investigated through the soil tests, such compaction, CBR, cone penetration tests. Finally, it was found that the best mixing rate of tsunami deposit with concrete rubble was 7 for 3.
