FIELD: process engineering.
SUBSTANCE: this invention relates to construction, particularly, to production of ballast to be used in construction of roads, bridges, airfields, railway tracks, etc. Proposed method comprises preparation of stock, its grinding, compaction, drying and thermal treatment. Raw mix is produced from natural sand and metallurgical slag admixtures or those of thermal electric power station slag and ash, said mix being ground and compacted at 35-150 MPa to obtain 50-150 mm deep boards. After drying, said boards are cut to cubic shape and annealed at 1100-1180°C.
EFFECT: high quality cube-shaped ballast, higher hardness zero flakiness.
2 tbl
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