The present invention is a cement; The fine sand of various particle size of the calcined bauxite sand mixture having an average particle size of the coarse sand with a mean particle size of less than 10mm than 1mm; Having a diameter smaller than 90% of the particles are 1㎛, silica fume having an average diameter of about 0.5㎛ corresponding to 15 parts by weight at the most per 100 parts by weight of cement; Defoamers; Taking extinguishing seconds; Alternatively, the fiber; And an ultra-high-performance self-compacting concrete containing water. The invention also 10m ² / g or larger, preferably 15m ² / g or more, and more preferably from about 20m ² / g specific surface area, and more than 0.3, preferably ultrafine acid with more than 0.4 form factor (FF) It includes more calcium particles. The ratio of cement, sand, ultrafine calcium carbonate particles and silica fume is at least three, and at most has the five different particle size grades are particle size distribution with an average diameter of the particle size classes to average diameter of the grades is about 10 to be. In addition, the present invention relates to a process for the preparation and use such concrete. Self-compacting concrete, silica fume, defoamers