FIELD: building industry. SUBSTANCE: expanding addition has gypsum and volcanic rock containing aluminium oxide (up to 30%) at the following ratio of components, wt.-%: gypsum 15-35 and volcanic rock 65-85. Expanding addition has additionally 1-5% dolomite and 4-30% microsilica above 100%. EFFECT: increased concrete strength, simplified production. 1 tbl
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