SU808428A1 - Gypsum-concrete mixture - Google Patents

Description

t

The invention relates to compositions of concrete mixtures with fillers of organic and mineral origin and can be used in industrial and civil construction.

Known gypsum concrete mix, including gypsum, inorganic and organic aggregates .. Natural lightweight aggregates (pumice, tuffs, etc.) and artificial (fuel and granulated blast furnace slags, claydite, agloporite, etc.) are used as the inorganic aggregate, as well as heavy inorganic aggregates (quartz sand, granite and calcareous crushed stone, gravel and gypsum crushed stone). Sawdust, timber, straw and flax, etc. are used as organic aggregates. The use of one or another type of aggregate in gypsum concrete is determined by the availability of raw materials, the physicomechanical characteristics of concrete, and economic considerations l.

Closest to the technical essence and the achieved result to the proposed is a concrete mix, including construction

gypsum, sand, sawdust and water used in the production of prefabricated building products - partitioning panels manufactured by the method of rolling 2 j.

The purpose of the invention is to increase the strength of products.

This goal is achieved by the fact that the gypsum-concrete mixture, including gypsum, mineral aggregate, sawdust and water, contains shale as the aggregate in the following ratio of components, wt.%:

Construction gypsum 25-30 Clay slate 40-45 Sawdust 5-7 Water Else

Shale is a rock that arises as a result of the conversion of clays mainly under the influence of pressure, due to which it is characterized by schistosity. Unlike clay, slate does not soak in water, it has considerable hardness and does not become plastic, it is widely distributed in folded areas. Tables 1 and 2 present the mineralogical and chemical compositions of shale-1 Example. To obtain a gypsum-concrete mixture, 3 compositions are prepared, including wt.%; Construction grade 1 grade of the Krasnoyarsk plant of building materials (25; 27, -30), clay slate of a fraction of 5 mm or less, not carried out in the production of kergmzit at the Uglovsky plant of building materials and parts (40, -42 45), sawdust of the Krasnoyarsk woodworking plant (5; b; 7 and water (30; 25; 18); Each mixture is prepared as follows. The dry mixture of gypsum, shale and sawdust is mixed manually for 2 minutes and then sealed with water. The resulting concrete mixture placed in metal molds with a size of 7.07 x 7 , 07x7.07 cm and kept in air-dry conditions until stripping.

Quartz25-30

Feldspar 12-14 Clayey substance

Calcite Chlorite Mica

Table

Content, wt.%

50-55 5-7 5-7 2-3 splint samples produced after 1 h after the start of molding. In tab. 3 shows the physico-mechanical properties of concrete samples. As can be seen from Table 3, the strength characteristics of gypsum-concrete samples on shale are 30–40% higher than those of a known mixture. In laboratory conditions, samples of gypsum concrete with sand and shale were tested for shrinkage according to GOST 12852-67 and accelerated high-temperature drying (200-220 ° C). The shrinkage of gypsum concrete samples after 21 days, with sand - 1.6 mm / m, with shale - 1.3 mm / m. Samples of gypsum concrete with sand and shale, undergone accelerated drying / have a smooth surface without visible cracks. The results of testing samples of gypsum concrete with shale allow us to recommend it as a filler instead of sand in the production of gypsum concrete panels.

7.58 58.67 15.88 6.42 3.61 3.31 0, 2.03 2.18 100

Table 2

We offer concrete mix

Invention Formula

Gypsum concrete mix, including building gypsum, mineral aggregate, sawdust and water, characterized in that, in order to increase strength, it contains shale as a filler in the following ratio of components, wt.%:

Construction plaster 25-30 Clay slate x40-45

Table 3

Sawdust 5-7 Water Else

Information sources,

taken into account during the examination 1.Volzhansky A.V. Ferronska A.V. Gypsum in sting and products, M., stroiizdat, 1974, p. 248.

2.Pechuro S.S. Production of gypsum and gypsum-concrete products and structures, M., Higher School, 1971. p.224.

Claims (1)

Claim Gypsum concrete mixture, including building gypsum, mineral aggregate, sawdust and water, characterized in that, in order to increase strength, it contains clay shale as an aggregate in the following ratio of components, wt.%: Building Plaster 25-30 Clay slate _h 40-45 Sawdust 5-7 Water Else