SU399483A1 - METHOD OF MANUFACTURING DECORATIVE - Google Patents

Description

one

The invention relates to methods for producing decorative double-layer slabs.

A known method of making decorative two-layer plates is face down, consisting in sequential laying in the form of decorative and constructive concrete layers, followed by heat treatment of the products.

The purpose of the invention is to increase the strength, frost resistance and reduce the abrasion of plates.

This is achieved by placing a previously prepared mixture of limestone and sand with a moistened, for example, marble aggregate at the bottom of the mold as a decorative layer, and pour a dry mixture of portland cement and sand on top, after which the products are pressed at 180–200 kg / cm and then subjected to autoclave treatment and grinding of the front side.

For the manufacture of a decorative layer it is envisaged to use marble crumb fractions: 5-10; 10-15 and 15-20 mm.

The molding moisture of the decorative layer is 23-25%.

Pre-prepared silicate-concrete mixture with a moistened decorative, for example, marble aggregate dispenser, is fed into the molds of the molding unit, for example, Atomic-508 in the amount necessary to fill the molds with

half height. After micro mixing, a mixture of fine-grained concrete is fed into the mold for the base layer. After compaction, the molded raw material is removed from the mold, placed in a stack on the floor for pre-exposure (2-4 hours) in order to hydrate the lime in the molded plates, and then into the autoclave for final hardening in a saturated water medium under a pressure of 8 atm. mode 2-f-8- | -2 hours.

Excess water introduced into the silicate-concrete mixture (to give P1 the necessary mobility) is completely spent on lime hydration in the molded concrete while ensuring the process of hydration and hardening of the lime-sand mixture.

The resulting decorative marble tiles throughout the thickness of the process acquire a uniform moisture content prior to loading into the autoclave, there is no evidence of internal overvoltages and the plates are not boxed.

Plates have the following physical and mechanical properties:

Volume weight

2200 kg / mz 300-400 KG / CM2

Compressive strength (cubes 15X15X15 cm with two layers)

Strength limit at iz-50-80 kg / cm

gib (plates 50X50X3 cm)

2% water absorption by weight

over 50 tsikamorozostoykost lov of 0,20 g / cm2

Abrasion

The whiteness of the plates of the proposed composition is equal to 73.5%, which corresponds to the whiteness of the white cement slabs.

Subject invention

A method of making decorative two-layer nlit "face down, comprising

in successive laying in the form of decorative and constructive concrete layers with subsequent heat treatment, characterized in that, in order to increase strength, frost resistance and reduce abrasion of the plates, a pre-prepared mixture of lime-sand in emery with wetted, for example, is laid as a decorative layer to the bottom of the form , a marble aggregate, and a dry mix of Portland cement and sand is poured on top, after which the products are pressed at a pressure of 180-200 kg / cm and then subjected to autoclave treatment and face grinding.