Materials
To increase the long-term strength and to decrease the
elution of the alkaline component, blast furnace cement
containing 30% blast furnace slag provided by domestic
company ‘‘S’’ was used. Table 2 displays its physical
properties. Coarse aggregate made of crushed stones with
5 to 10 mm and 10 to 20 mm singular particle sizes supplied
by company ‘‘H’’ in Geumsan, Chungnam was used. Table
3 displays the bulk density, water absorption ratio and bulk
unit weight of the coarse aggregate used. Fly ash from the
bituminous coal-fired Boryung Thermal Power Plant was
used. Table 4 displays its chemical compositions and
physical properties. Silica fume provided by an Australian
company ‘‘E’’ that is expected to have a strength enhancing
effect was used. Table 5 displays its chemical compositions
and physical properties