Refractories which have dense-structure as well as spalling resistance and method for fabricating same

This invention relates to dense structure refractories having heterogeneous structure and resistance to spalling whose heterogeneous structure is composed of major high density areas of (1) coarse and intermediate grains of secondary particulate and minor low density areas of (2) fine grains and fine powders of secondary particulate distributed in a zigzag random way at the boundaries between the coarse and intermediate grains, which are fabricated from an overall batch mixture consisting of more than 60% by weight of particles of secondary particulate larger than 0.5 mm and less than 40% by weight of particles of secondary particulate smaller than 0.5 mm in size.