CENTRIFUGAL CASTING METHOD OF CONCRETE, AND CENTRIFUGALLY CASTED CONCRETE

摘要

PROBLEM TO BE SOLVED: To provide a centrifugal casting method of concrete, which is easy to knead concrete to be used, and enables the manufacture of ultrahigh strength concrete products, and also can be operated industrially stably.;SOLUTION: The centrifugal casting method of concrete comprises a process of kneading and mixing a cement composition in which water/bonding agent ratio is 20 mass% or less, and a high-performance AE water reducing agent to prepare concrete in which a slump flow is 50 cm or more, a process of throwing the prepared concrete in a formwork of a centrifugal molding machine while rotating slowly the formwork, a process of adding to the concrete an additive having a bad compatibility with the high-performance AE water reducing agent to decrease the fluidity of the concrete, and a process of rotating the formwork at high speed after the decrease in fluidity of the concrete.;COPYRIGHT: (C)2009,JPO&INPIT