SU1740196A1 - Method for manufacture of multilayer external wall panels - Google Patents

Abstract

Usage: in the technology of manufacturing exterior wall panels with a high degree of factory readiness. The essence of the invention: a decorative concrete mixture with the addition of aerosil in an amount of 0.45-0.7 wt.% By weight of the mixture is prepared, a light concrete mixture on porous aggregates with a mobility of 1-4 cm and a sand-cement mixture of a protective layer. The resulting mixtures are successively placed in a mold and vibrated for 5-15 seconds.

Description

This invention relates to a technology for manufacturing exterior wall panels with a high degree of prefabrication and can be used in the prefabricated housing industry.

The closest to the proposed technical essence and the achieved result is a method of making exterior wall panels face down, including the preparation and sequential laying of a layer of decorative concrete mix, light concrete mix and a protective layer of cement-sand mix with subsequent vibration. Wall panels, manufactured by a known method, have an increased water absorption, which reduces the insulating properties of the panel.

The aim of the invention is to reduce water absorption and reduce the cost of products.

PRI me R 1. Make a three-layer outer wall panel. Layers of decorative concrete mix with a thickness of 20 mm, light concrete mix with a thickness of 310 mm and a layer of protective cement-sand mix with a thickness of 20 mm are sequentially prepared and laid. The composition of the decorative mixture; colored cement, sand, water, aerosil with a cement: sand ratio of 1: 3 and a V / C of 0.55. Aerosil in the amount of 0.45 wt.% (10 kg / m was introduced into the mixer when the mixture was prepared. Lightweight concrete layer (main) of claydite-concrete of grade 50 with a bulk weight of 900 kg / m 3. Prepared clay-aggregate concrete mixture with a draft of a cone 3 -4 cm of composition: cement 350 kg / m3, sand with Mk 2.5-300 kg / m3, expanded clay 500 kg / m3 (or 1 m3 / m3). The third protective layer of cement-sand mixture of cement sand 1 : 5 and V / C 0.5. After laying all

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layers vibrate the freshly molded product for 5 seconds.

PRI mme R 2. The sequence of operations is analogous to Example 1. 0.7% by weight of aerosil are added to the composition of the decorative concrete mix on the colored cement during the preparation. The main layer is a slag concrete mark 50, with a mass of 900 kg / m3, with a draft of 1-2 cm. The third protective layer is as in example 1, the product is vibrated for 15 seconds.

Water absorption products for example 1-6%, for example 2-5. ,

Studies have shown that in the proposed mode of vibration, aerosol floats and spreads in the form of a dense protective film in the lightweight concrete base layer of the product, and even if the decorative layer is broken, lightweight concrete thus has a reduced water absorption, at least 2 times lower. than the prototype, and the inner layers of the panel are protected from moisture. Reduced water absorption remains almost unchanged during the life of the building, which positively affects the heat and humidity conditions of its interior, especially when operating in humid climatic zones.

Since aerosil is introduced into a layer with a thickness of 20 mm, its consumption per 1 m3 of product is reduced almost 20 times.

The cost of heating a building when using exterior wall panels manufactured by the proposed method is reduced by 5-7%.

Claims (1)

The invention The method of manufacturing a multi-layered exterior wall panels, face down, comprising preparing and sequentially laying a layer of decorative concrete mix, light concrete mix on porous fillers with a mobility of 1-4 cm and a protective layer of cement-sand mix followed by vibration, characterized in that in order to reduce water absorption and reduce the cost of products, aerosil in an amount of 0.45-0.7 wt.% by weight of the mixture is introduced into the decorative concrete mixture during the preparation, and vibration is carried out for 5-15 seconds.