The analysis of the results of researches showed that the use in the composite binding ash with specific surface 400 m 2/kg in an amount up to 20% leads to an increase in strength from 10.6 to 20.5% compared with the strength of cement grade CEM I 42.5N. The degree of hardening increases with increasing dispersion of ash, ash is the most effective addition with specific surface 800 m 2/kg at 5%, the compressive strength increased by 30.6% relatively to CEM I 42.5N.
ash, specific surface, normal density, hydration, strength, fine hydrosilicates
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