FIELD: chemistry.
SUBSTANCE: concrete mixture contains, wt %: portland cement 18.87-21.34, expanded clay 41.13-41.56, superplasticiser LSTM 0.0312, thermal power plant fly ash 13.92-18.87, gas-forming additive PAK-3 0.022-0.025, iron-containing sludge - chemical production waste 0.10-0.50, water - the balance.
EFFECT: obtaining concrete with higher strength and low density.
3 tbl
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