FIELD: construction.
SUBSTANCE: raw mixture for production of concrete contains, wt %: cement 20.0-25.0; fine aggregate 20.0-40.0; plasticizing agent 0.1-1.5; water 15.0-25.0; used printed-circuit boards crushed and sieved through the mesh No. 5 9.9-39.5.
EFFECT: safe disposal of printed-circuit boards when obtaining the required strength.
1 tbl
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RU2334710C1 |
