COMPLEX ANTIFROSTY ADDITIVE Russian patent published in 1994 - IPC

FIELD: building materials. SUBSTANCE: complex antifrosty additive has, wt. -% : sodium nitrite 32-50; waste of ferrosilicon production 49-65, and potash 1-3. Concrete compression strength with additive (after 24 h hardening at negative temperature) is up to 2,75 MPa, bending strength is up to 1.14 MPa, resistance to cold is up to 450 cycles. Compression strength of concrete with additive (after 24 h hardening at negative temperature and TBO) is 40.9 MPa, bending strength is 8.6 MPa. Complex additive is used in concrete for working at the winter conditions. EFFECT: enhanced quality of complex additive. 2 tbl