NON-SPARKING DOUBLE-LAYER TILE AND METHOD OF MAKING SAID TILE Russian patent published in 2009 - IPC C04B28/04 C04B40/02 E04C1/40 E04C2/26 B32B7/02 B28B1/16 C04B111/20 

FIELD: chemistry.

SUBSTANCE: invention relates to industrial construction materials, and more specifically to double-layer structures and method of making such structures, particularly non-sparking double-layer tiles, meant or covering floors in category A and B fire safety buildings. The non-sparking double-layer tile is in form of a concrete monolithic body with a face layer, which has a regular or irregular geometrical shape, where material for both layers is a mixture, used in semi-dry state, containing, wt %: composition of the mixture of the base layer: portland cement of at least grade 500 DO 20.55 to 22.78, construction sand with particle size 5 mm with fineness modulus of not less than 2.4 72.89 to 75.34, Poliplast MB-1 0.20-0.30, water - the rest; composition of the mixture of the face layer: portland cement of at least grade 500 DO 23.98 to 26.19, limestone in form of sand from siftings from crushing sedimentary rocks with strength grade of at least 400 with particle size 2 to 4 mm and fineness module of not less than 2.4 69.84-71.94, Poliplast MB-1 0.23 to 0.30, water - the rest, where the face layer has thickness of not less than 10 mm. The method of making the said tile involves preparation of each of the said mixtures with moisture content of 6-8% in mixers by successive loading the given filler, additive, portlant cement, stirring dry components for 30 to 60 s, then, while stirring, adding water and continue to stir the mixture for the base layer for 30 to 40 s, and the mixture for the face layer - for 2 minutes, placing the mixture for the base layer into a mould, preliminary compacting with light vibration or ramming without vibration, placing the mixture for the face layer on top of the compacted base layer, final compacting with vibrocompression for 20 to 23 s of the said mixtures and solidification in a steam curing chamber at temperature of 40°C, moisture 95 to 100 % and rate of increase and decrease of temperature not more than 25°C/h. Invention is developed in subclaims.

EFFECT: increased compression and bending strength, reduced wearability.

4 cl, 4 ex, 3 tbl