FIELD: construction.
SUBSTANCE: group of inventions relates to construction, particularly to a method for producing light cementing mixture which is intended for making cement-chip boards and compositions for making light cementing binding substance. method of producing light cementing mixture for making cement-chip boards with improved compression strength and water resistance, involves mixing water, reactive powder, 1-200 pts.wt aggregate, 1.5-6 wt% alkali metal salt and citric acid, 0.5-1.5 wt% alkali metal silicate, 2.0-6.0 wt% foaming agent and optionally foam stabiliser, pts.wt are given in terms of dry substance per 100 pts.wt reactive powder, 80 to 100 wt% flue ash, wherein flue ash includes flue ash class C, flue ash class F with Portland cement type III; and a mixture of flue ash class C and fly ash class F, optionally with Portland cement type III, and optionally reactive powder does not contain hydraulic cement. Composition for making light cementing binding substance for making cement-chip boards using described method contains a mixture of: cementing reactive powder containing from 80 to 100 wt% flue ash, 1-200 pts.wt filler, 1.5-6 wt% of alkali metal salt and citric acid, 0.5-1.5 wt% alkaline silicate, 2.0-6.0 pts.wt foaming agent, optionally, a foam stabilising agent based on polyvinyl alcohol and water, pts.wt are given in terms of dry substance per 100 pts.wt reactive powder, wherein ratio of water to solid phase of cementing reactive powder in mixture is approximately 0.22-0.287:1, concentration of polyvinyl alcohol, in case of presence, in aqueous solution is approximately from 2 to 5 %, flue ash includes flue ash class C, flue ash class F with Portland cement type III; and a mixture of flue ash class C and fly ash class F, optionally with Portland cement type III; density of binding substance is approximately 0.48-1.04 g/cm3 (from 30 up to 65 pounds per cubic feet) with stable bubbles of micron size, and compression strength of binding substance, measured after 14 days, is approximately 6.90 to 9.65 MPa (from 1,000 pound/sq. inch to 1,400 pound/sq. inch).
EFFECT: technical result is increased compression strength at low weight.
10 cl, 2 dwg, 13 tbl, 4 ex
