The purpose of this paper is to investigate the pumpability of SWC (Super Workable Concrete). SWC which has the property of self-compacting is being widely used for various structure but often causes the decline of slumpflow by pumping.
SWC which mixed ordinary portland cement and flyash was mainly used in this experiment. It was found that the decline of slumpflow was related to the properties of concrete and the conditions of pumping. The properties of concrete were the mix proportions such as the ratio of cement and flyash, kinds of admixture and the size of slumpflow before pumping. The conditions of pumping were the velocity of concrete in pipeline, the total length and the shape of pipe. Above all, the decline of slumpflow tends to be related to the degree of pressure loss. In addition to slumpflow, the changes of the fluidity of wet-screening mortar, pressured bleeding ratio, strength, durability factor and pore volume were confirmed by pumping experiment.
