Abstract
In this technical report outline of the first application, in Japan, of the ultra highstrength concrete with design strength of 600 kgf/cm2 using silica fume to a super high-rise building is presented.The structure of the 39 story building is a steel frame with steel tube colums filled with the ultra high-strength concrete. The concrete was pumped into the columns from the bottom up to 61.9 m at a time. For the production of the silica fume concrete, a ready mixed concrete plant that enables the use of as-produced silica fume was developed. Trial mixing tests, pumping tests and bottom-up concreting tests were carried out before construction. The outline of the plant and the results of the actual construction are presented along with the preliminary tests.
