FIELD: chemistry.
SUBSTANCE: present invention relates to an additive for hydraulically setting compositions, comprising a colloid-dispersed composition of at least one salt of a mono- or polyvalent metal cation and at least one compound capable of releasing an anion that forms a slightly soluble salt with a metal cation, and at least one polymeric sulphonated dispersing agent. Invention is developed in dependent claims of the invention.
EFFECT: preserving the slump of a cone without adversely affecting other characteristics of concrete, such as, for example, early strength.
16 cl, 6 tbl
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