| Title |
Changes in Physical Properties Depending on Curing Conditions of Extruded Cement Mixture with Crushed Stone Powder |
| Authors |
Song Tae-Hyeob ; Lee Sea-Hyun ; Kim Young-Hun |
| Keywords |
Waste Ston Sludge ; Extrution ; Hydration ; Curring |
| Abstract |
Enormous side products and wastes have been produced from industrial activities. Besides fly ash, powder of furnace slag, and calcium deposits, tens of million tons of concrete products are discarded annually. These side products and wastes are recycled in various ways in line with their properties. However, some wastes such as crushed stone powder, glass, and wood wastes have exhibited very low recycle rates despite of their enormous amounts. These wastes are not economically feasible mainly due to high contents of impurities and moisture. This study carried out experiments substituting silica power in an cement extruding process for 50% crushed stone powder. Physical properties and hydrothermal characteristics of the crushed stone power were analyzed depending on the replacement and curing methods. Consequently, when 50% crushed stone powder was replaced, the overall rigidity of the product was less than that of the cement product with silica powder; however, the compressive strength turned out to be 90% of that in the silica powder product depending on secondary curing conditions. In this case, the pre-curing period was maintained in 2 hours while the primary and tertiary curing was carried out for 4 hours so that the overall compressive strength of the product with the crushed stone powder did not deteriorate the product quality. Therefore, changes in physical properties of the concrete product using the crushed stone power are not assumed to be significant when it is supplemented by SiO2 sources to maintain the appropriate C/S mole ratio, and the hydrothermal reaction was also adequately activated. |