FIELD: building industry. SUBSTANCE: invention proposes binding agent that contains clay shale roasted at 550-950 C. Clay shale has the following components, wt. -%: SiO2, 50-54; Al2O3, 18-22; Fe2O3, 9-10; CaO, 0.5-0.9; MgO, 2-4; R2O, 1.5-2.5; TiO2, 0.5-1.2; and nonidentified components, the balance. Optimal ratio of binding agent component, wt.-%: portland cement clinker, 30-85; gypsum, 1-8; clay shale, 10-65; and superplasticizer agent, 0.5-3.5. Concrete based on the indicated binding agent exhibits the increased strength and hardiness. EFFECT: improved properties. 3 tbl
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