FIELD: building bases for roads. SUBSTANCE: 50 to 70 per cent of calcium sulfate phosphodihydrate and 30 to 50 per cent of phospho-semi-hydrate are mixed, moistened, laid down and compressed using cyclic effect accounted for 6 to 12 times with 1.0 to 10.0 MPa for 0.2 to 2.0 s. Compression strength of water- saturated samples is 4.7 7.2 MPa. Resistance to cold coefficient after 25 freezing/defrosting cycles is 0.77 0.89. EFFECT: high strength of roads. 2 tbl
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