CELLULAR CONCRETE MIX AND METHOD OF PREPARATION OF SUCH MIX Russian patent published in 2007 - IPC C04B38/02 

FIELD: manufacture of building materials and heat-insulating materials.

SUBSTANCE: proposed cellular concrete mix may be used for manufacture of heat-insulating materials working at temperature of 800-1200C. Proposed mix contains the following components, mass-%: portland cement, 16-25; lime, 6-10; coal tar ash, 16-25; aluminum powder, 0.18-0.36; carboxymethyl cellulose, 0.17-0.25; alsulfate, 0.18-0.28; water glass, 0.45-0.6; calcium chloride, 0.2-0.4; tripolite, 4-5.5; polyvinyl acetate dispersion, 8-10; the remainder being water. Method proposed for preparation of cellular concrete mix includes mixing of components in turbulent mixer at simultaneous introduction of compressed air at pressure of 1-3 atm through microporous material placed in zone of maximum turbulence of mix, pouring the mix into mold; mixture of portland cement, lime, tripolite and coal tar ash is preliminarily subjected to activation in the process activation plant made in form of pipe mounted at angle of 30-35° for passage of mix through activation zone during 1.5-2 min; this pipe is loaded with mix containing ferromagnetic particles which is to be ground and powerful revolving magnetic field is induced; coal tar ash is additionally ground to specific surface of 4500-5000 cm²/g; then, mixture thus obtained, alkyl sulfate, carboxymethyl cellulose, polyvinyl acetate dispersion and water are being mixed in turbulent mixer for 3-5 min, after which aluminum powder and calcium chloride are introduced and additional mixing is performed for 0.5 min. Mix poured into mold is heated to temperature of 100C for 1.5 h.

EFFECT: enhanced strength of cellular concrete.

3 cl, 1 tbl