Efforts to use coal ash in Fukushima Daiichi Nuclear Power Station tsunami countermeasure construction

At the Fukushima Daiichi Nuclear Power Station, coal ash is being utilized in tsunami countermeasure construction. The projects where coal ash has been used or is to be used are as follows: (1) Japan Trench tsunami countermeasure tide embankment currently under construction, (2) Kuril Trench tsunami countermeasure tide embankment that was established as a countermeasure against the Kuril Trench/Japan Trench tsunamis, which were announced to be highly imminent as a new finding, and (3) outer-rise tsunami countermeasure tide embankment, which was installed as an emergency measure after the accident at the Fukushima Daiichi Nuclear Power Station on March 11, 2011. The Japan Trench tsunami countermeasure tide embankment construction work has begun in June 2021. From the standpoint of process and cost, it uses ashcrete, which effectively utilized coal ash (raw powder) with a usage experience at the Fukushima Daiichi Nuclear Power Station. This paper reports on the characteristics and usage of materials such as ashcrete made from coal ash. (A.O.)