CONCRETE BATCH CASTING METHOD OF HIGH-FLOWABILITY HIGH PERFORMANCE CONCRETE AND LOW-FLOWABILITY HIGH PERFORMANCE CONCRETE

摘要

The present invention relates to a method of batch-placing high-fluidity and high-performance concrete and low-fluidity and high-performance concrete. Since high-fluidity and high-performance concrete for the formation of a girder for a bridge and low-fluidity and high-performance concrete for the formation of a floor plate for the bridge are batch-placed through concrete placement equipment, the present invention is capable of reducing time and costs for construction as well as preventing a cold joint and improving durability to extend the lifespan of the bridge. Moreover, the present invention is capable of securing workability required for keeping the amount of a high-performance water reducing agent uniform when batch-placing high-fluidity and high-performance concrete and low-fluidity and high-performance concrete; securing workability required for using a cellulose derivative thickener, a starch derivative thickener, or a sodium alginate thickener for mixing high-fluidity and high-performance concrete; controlling a slump flow required for the same hydration reaction period without a serious influence on pumping; and reducing or increasing injecting pressure by improving pumping performance through an air entraining agent (AE agent) or alginate foaming agent additionally used for mixing high-fluidity and high-performance concrete.