SU872523A1 - Raw mixture for making arbolite - Google Patents

Description

(54) RAW MIXTURES FOR THE MANUFACTURE OF ARBOLIT

The invention relates to the construction of building materials and can be used in the manufacture of arbolitovyh products. The known raw material mixture for the manufacture of arbolite, including gypsum crushed bark and a setting regulator l J. The closest to the invention in technical essence and the achieved result is the raw mixture for the manufacture of arbolit, including gypsum, wood filler and water. 2 The disadvantage of known mixtures is low water resistance. The purpose of the invention is to increase the water resistance. This goal is achieved by the fact that the raw mix for the manufacture of wood concrete, including gypsum, wood filler and water, additionally contains hydrolytic lignin in the following ratio of components, wt.%: Gypsum 44.3-44.8 Wood filler, 25.0-25.4 Water24 1-24.6 Lignin 5, 4-6.5 Example. Wood shredder with a 15% moisture content is mixed with another, freshly hydrolyzed lignin with 72% moisture until a homogeneous mixture is obtained. Gypsum of 300 grade according to TU31-71 is introduced into the resulting mixture and mixed again to obtain a homogeneous mixture, into which water is then introduced and the final mixing of the raw mix is performed. The compositions proposed and known raw material mixtures are given in table. 1 "From the resulting mixtures, cubic samples were prepared with a side size of 150 mm by pressing under a pressure of 5 kgf / cm. Dried to 10% residual moisture, samples are kept in de with 100% residual moisture in. 240 days and experience. 40 samples are tested from each mixture. In tests, an increase in the mass of the products and their compressive strength are determined. The results of testing samples from the proposed raw material mixture and known are presented in Table. 2 From tab. 2, it can be seen that the increase in the mass of products in a humid environment from the raw mix with the addition of other hydrolytic lignin is significantly lower than the increase in the mass of products without the additive, and the strength of the former varies less and has a much greater end of testing time.

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23 20 19 19 18 3 well, which confirms the advantages of the proposed mixture for making arbolit. When testing samples of products, it was found that the introduction of wood-based hydrolytic lignin into the raw material for the manufacture of arbolit reduces the hygroscopicity of the products (reducing the water absorption of products by 3.9-4.2 times when tested in an environment with 100% relative humidity for 240 days and increase their compressive strength by 2 times compared with arbolite products without a house. This increases the durability of building structures and structures that are operated at increased humidity. Table 1

I

Composition

Duration of the product release

in a humid environment.

ABOUT

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ABOUT

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ABOUT

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famous

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Claims (1)

The invention contains a mixture for the manufacture of arbolit, including gypsum, wood filler and water, which is so that, in order to improve water resistance, it additionally contains hydrolyzed lignin 8725236 Continued table. 2 Indicators Increase in weight, products,% 23 21 20 nineteen nineteen 23 21 nineteen nineteen 18 23 21 20 20 nineteen 26 20 sixteen and With the following ratio Comrade, wt.%: Gypsum44.3-44.8 Wood Z4polnitel25, 0-25.4 Voda24,1-24,6 Hydrolysis lignin5,4-6,5 7872523 8 Sources of information, industrial, 1969 № 10 taken into account during the examination. 13.    Temporary instructions on out of readyI. Pitstszha n. L. Korolit-no-leniyu and application of products from wood concrete new construction material. - Les-5 on technical gypsum. Saratov, 1974, p. eleven.