CONCRETE MIX WITH IMPROVED CHARACTERISTICS WITH USE OF ELECTRIC FILTER SHALE ASH Russian patent published in 2015 - IPC C04B28/04 C04B111/20 

FIELD: construction.

SUBSTANCE: concrete mix, containing portland cement, sand, crushed stone, water, modifying additive - plasticiser, and shale ash produced by burning of flammable dispersed shales on heat power plants with shale ash particle size of 9-12 micron, contains 6-16% of free calcium oxide, 27.0-34.0 wt % of glassy phase and 15.0-35.0 wt % of insoluble residue, and specific surface of shale ash makes 2800-5000 cm2/g, and content of chlorides in it of 0.01-0.6 wt %, at the following ratio of specified components, wt %: portland cement 7.00-21.09, crushed stone 40.00-46.41, sand 30.00-39.60 or 41.00-46.60, shale ash 2.10-8.43, modifying additive 0.01-6.00, water - balance.

EFFECT: development of a concrete mix with improved physical-mechanical properties, making it possible to produce concrete with improved operational characteristics, including lower subsidence.

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