A research on the mechanical property, work efficiency and structural characteristics of heavyweight concrete

Generally thickness is increased in walls and slabs to improve the shielding ability of normal concrete in the buildings in nuclear power plants. On the other hand, the decrease of thickness of members and the decrease of building size can be expected by the adoption of heavy weight concrete. But there are little principal members such as shear walls using heavy weight concrete. Therefore, the data related to the mechanical properties and the construction method are not sufficient. This study was carried out to examine the properties and the structural characteristics of heavy weight concrete, and to establish the construction method. The selection of aggregate, the properties of aggregate and the properties of heavy weight concrete are reported. Pumping test was carried out with two kinds of the mixing proportion, and its procedure and the results are shown. The heavy weight concrete was placed as wall specimens, and its procedure and the results are described. The static loading test on shear wall specimens was carried out, and its procedure and the results are reported. Magnetite and hematite ores adopted as the aggregate caused no problem. (K.I.)