FIELD: construction.
SUBSTANCE: complex additive for portland cement contains the following components, wt %: gypsum or anhydrite 30- 54, superplasticiser C-3 0.5-4.5, blast furnace dust 10-25, ash and slag wastes with content of aluminium oxide of at least 25 wt % 16.5-52.5, carbonate rock 12-35.
EFFECT: increased extent of expansion of portland cement, having higher hydraulic activity, reduced porosity of concrete at portland cement with the specified additive.
3 tbl
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