FIELD: structural materials production. SUBSTANCE: sample is weighted in air and water not less than four times during one minute. Dependency of sample weight change in water on time of weighting in water is determined. Sample weight in water without absorbed and capillary- collected water is determined. Sample volume is determined by a formula. EFFECT: estimation of quality of rock materials predominantly of fine porosity and irregular form. 1 dwg, 1 tbl
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