METHOD FOR FABRICATION OF AGGREGATE USED IN PHC PILE AND CONCRETE COMPOSITION FOR FABRICATION PHC PILE USING THE SAME

摘要

PURPOSE: A manufacturing method of aggregate for pretensioned spun high strength concrete (PHC) piles and a concrete composition for PHC pile manufacturing which uses the same are provided to omit an autoclave process which requires high energy consumption and to replace natural aggregate by using slag which is industrial byproduct generated from an electric steel manufacturing process. CONSTITUTION: A manufacturing method of aggregate for PHC piles comprises the following steps: (100) cooling oxidizing slag by using melted electric furnace which includes electric slag generated during a steel manufacturing process by the electric furnace; (200) crushing oxidizing slags by using the cooled electric furnace; (300) sorting the crushed electric furnace slag by magnetic force by composition of iron; and (400) sieving the sorted electric furnace oxidizing slag. The manufacturing method of aggregate for PHC piles additionally includes the following steps before the cooling step: (510) isolating ferric oxide by adding a reducing agent to the melted electric furnace oxidizing slag; and (520) adding silicon dioxide. [Reference numerals] (110) Between soil cooling; (120) Fan cooling; (130) Granulating mist cooling; (210) Coarse crushing; (220) Crushing; (300,CC) Magnetic separating; (400,DD) Sieving-analysis test; (510) Iron oxide separating; (520) Silicon dioxide adding; (AA) Electric furnace; (BB) Raw material: ion scrap, quicklime, etc.; (EE) Electric furnace oxidizing slag coarse aggregate; (FF) Electric furnace oxidizing slag fine aggregate