2017 Volume 28 Pages 61-69
Full-scale shielding containers were fabricated with heavyweight concrete containing high-density (at least 4.0 g/cm3) metal slag-type aggregate at an actual plant. In consideration of the significant segregation of heavyweight aggregate during placing, the concrete was produced as segregation-free medium-fluidity concrete. The effects of the addition of an expansive additive and the vibratory consolidation time on the physical properties, surface permeability, and pore volume of the concrete were investigated. Vibration times 2 to 10 times longer than usual were found to have little effect on compressive strength, but substantially affected the elastic modulus, causing reduction of the surface water-shielding performance on the placing surface side. Compared with normal concrete, however, the pore volume was significantly smaller, and the surface permeability was also low even with such excessive vibration, thanks to the effects of a low W/P ratio and the addition of an expansive additive.
