We carried out excavation of the remains of a boiler house in Maizuru 3rd Naval Explosives Arsenal. This investigation consists of measurement of the remains, performance evaluation of concrete, and estimating construction method. As a result, it was estimated that the boiler house was consisted of reinforced concrete foundations/walls, plain concrete floor, and some members from plain or fire bricks. On the other hand, the performance of concrete used for the remains was standard compared with the technical standards during World War II. These results will contribute to the grasp and the evaluation of the then architectural technology and design.
