SPHÄRISCHE HYDRAULISCHE SUBSTANZ UND IHRE HERSTELLUNG

摘要

A spherical hydraulic substance comprising a hydraulic powder based on CaO, SiO2, Al2O3 and Fe2O3, wherein at least the surface of the powder is melted for smoothening and then cooled and the powder has a particle diameter of 500 mu m or less and a means circularity of 0.7 or above. This substance is produced either by melting the starting material mainly comprising the above oxides, followed by splashing to effect cooling for solidification, or melting at least the surface of the hydraulic substance, followed by cooling for solidification. Alternatively it is produced by mixing a hot substance such as iron making slag in a state molten or heated above 500 DEG C with a dried, calcined, sintered or molten starting material based on at least one oxide selected among CaO, SiO2, Al2O3 and Fe2O3 and splashing the molten mixture to effect cooling for solidification. Since this substance is a minute spherical particle having a smooth surface and a shape close to a true sphere, it is remarkably excellent in fluidity and strength when kneaded with water.