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KEY WORDS

In this study, pumpability of ultra-high strength concrete using cement premixed with silica fume of specified design strength 150N/mm 2 was estimated. As a result, the following conclusions were derived. 1) Ultra-high strength concrete using cement premixed with silica fume over 15% of specified design strength 150N/mm 2 was able to be pumped well. 2) Viscosity of ultra-high strength concrete after pumping was fell down compared with before pumping. 3) Slump flow, air content, and compressive strength of concrete after pumping were almost the same as that of concrete before pumping.