RU2320621C1 - Concrete mixture - Google Patents

Abstract

FIELD: industry of building materials.

SUBSTANCE: invention relates to production of concrete wall block used in low building. Proposed concrete mixture comprises the following components, wt.-%: Portland cement, 27.45-30.4; keramzit, 23.1-35.0; water, 14.5-24.5, and nitrile rubber-base worked out rubber shells from pressing roller of spinning machine of stretch devices, 10.15-35.0 wherein indicated rubber shells and milled to crumbles. Invention provides preparing light and strength articles and utilization of large amount of rubber waste.

EFFECT: improved and valuable properties of concrete mixture.

2 cl, 1 tbl

Description

The invention relates to the building materials industry, in particular the production of concrete wall blocks for low-rise construction.

Known concrete mixtures, including Portland cement, expanded clay, water [1].

Known concrete mixture, including, wt.%: Cement 21,3-24,2; expanded clay 57.6-64.0; expanded clay sand 8.6-17.8; expanded perlite sand 3.2-4.6; saponified rosin 0.001-0.0012; water [2]. This mixture allows you to get light and durable concrete products.

The objective of the invention is to obtain light and durable concrete products with the inclusion of rubber waste.

The technical result is achieved by the fact that the concrete mixture, including Portland cement, expanded clay, water, additionally contains spent rubber shells based on nitrile rubbers from the pressure rollers of the exhaust devices of spinning machines with the following ratio of components, wt.%: Portland cement 27.45-30.4; expanded clay 23.1-35.0; water 14.5-24.5; rubber shells 10.15-35.0. Rubber shell crushed into crumbs.

To prepare the concrete mixture, the raw materials are prepared and dosed: Portland cement, expanded clay fractions of 5-10 mm, drinking water, spent rubber shells based on nitrile rubbers of the BNKS brand (nitrilast), removed from the pressure rollers of the exhaust devices of spinning machines. By grinding the rubber shells, rubber crumb is obtained (with a bulk density of 102 kg / m ³ ). The use of rubber crumb has certain features.

The lengths of the pressure rollers of the exhaust devices of the spinning machines are 32 mm, the outer diameter is 26 mm, the inner is 16 mm.

The crumb rubber, being a fine material, has a residual static stress. Its individual particles are collected due to mutual attraction, forming a bound loose material. With mechanical action, the attractive forces are weakened, and the crumb rubber begins to "dust", so when preparing a concrete mixture, including crumb rubber, it is necessary to mix it with expanded clay. In this case, the particles of crumb rubber coagulate around the expanded clay particles, thereby weakening their mutual attraction and residual static stress.

Exemplary concrete mixes and concrete characteristics are given in table 1.

Table 1 Components Content, wt.%: composition No. 1 composition No. 2 composition No. 3 Portland cement 30,4 27.45 28,4 Expanded clay 35.0 23.1 25.0 Water 24.45 14.5 18.1 Rubber shell - 27.45 19.85 Baby received
grinding rubber
new shells (3-5 mm) 10.15 7.5 8.65 The compressive strength of concrete, MPa 3.2 3.2 4.8 The density of concrete, kg / m ³ 900 720 950

Water is added to the mixture of dry components (Table 1) and everything is thoroughly mixed. The prepared concrete mixture is placed in metal (pre-lubricated with mineral oil) molds and served for heat and moisture treatment.

The use of the proposed concrete mixture allows to obtain light and durable products, while a large amount of rubber waste is utilized.

Information sources

1. Afanasyev A.A. Concrete works. - M .: Higher school, 1991. - S.9-15.

2. A.S. USSR No. 1276650, С04В 28/02, 14/18, 1986, bull. 46.

Claims (2)

1. Concrete mixture, including Portland cement, expanded clay, water, characterized in that it further comprises spent rubber shells based on nitrile rubbers from the pressure rollers of the exhaust devices of spinning machines in the following ratio of components, wt.%: Portland cement 27.45-30.4 expanded clay 23.1-35.0 water 14.5-24.5 specified rubber shell 10.15-35.0 2. The concrete mixture according to claim 1, characterized in that said rubber shells are crushed into crumbs.