COMPLEX ADDITIVE Russian patent published in 2000 - IPC

FIELD: civil engineering and building materials industry, more particularly preparation of complex additive to cement mortars and concretes. SUBSTANCE: complex additive comprises, wt %: aluminium sulfate, 1-25; iron sulfate, 2-40; alkali component, 0.1- 10; powder-like silica, 25-60; urea, 1-10; plasticizer 6- 10; polyphosphoric acid salt, 0.2-1. Alkali component is sodium or potassium carbonate, and polyphosphoric acid salt is potassium or sodium polyphosphate, and plasticizer is superplasticizer C-3. EFFECT: greater strength acceleration during first hours of hardening of cement mortars and concretes without reduction of strength in later periods of time and after steam curing.