Patent ID: 7641731

Claim:
A self-compacting concrete, having a characteristic 28-day compressive strength of at least 150 MPa, said compressive strength being measured for a concrete preserved and maintained at 20° C. without cure or heat treatment, comprising: a cement; a mixture of calcined bauxite sands of various particle sizes, the finest sand having a mean particle size of less than 1 mm and the coarsest sand having a mean particle size of less than 10 mm; ultrafine calcium carbonate particles having a specific surface area of 10 m 2 /g or more, and a form factor FF of 0.3 or more; a defoamer; a water-reducing super plasticizer; optionally, fibers; and water, the cements, sands, ultrafine calcium carbonate particles having a particle size distribution such that there are at least three and at most five different particle size classes, the ratio of the mean diameter of one particle size class to that of the class immediately above being about 10.