RAW MIXTURE FOR CLAY BRICK MAKING Russian patent published in 1997 - IPC

FIELD: building materials. SUBSTANCE: raw mixture has, wt.-%: leaning addition, 5-20; burning out addition, 0.5-1.5; siliceous dust, 1.5-2.5; highly dispersed silica dust, 5-20; and low-melting clay, the balance. Brick properties: compression strength limit is increased from 170 to 205-225 kgf/$$$, bending strength limit is increased from 31 to 34-36 kgf/$$$. Refractoriness of clay brick is increased from 1350 C to 1450 C. Brick sort is increased from 150 to 200. EFFECT: enhanced quality and property. 1 tbl