RU2353603C1 - Raw material mixture for light concrete production - Google Patents

Abstract

FIELD: chemistry. ^ SUBSTANCE: invention relates to industry of building materials, particularly, to producing concrete wall bocks for low-riseconstruction. Raw material mixture for manufacturing light concrete includes, wt %: cement - 27.5-28.5, clayite of fraction 5-10 mm - 30.5-33.6, water - 14.5-18.1, milled in crumb of fraction not more than 0.8 mm waste car tyres based on nitrile rubber - 19.8-27.5. ^ EFFECT: obtaining light and durable products from concrete with reduction of clayite consumption and rubber wastes utilisation. ^ 1 tbl

Description

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

Known raw mix for the manufacture of lightweight concrete, 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 [1]. This mixture allows you to get light and durable concrete products. A disadvantage of the known composition of the concrete mixture is the significant consumption of expanded clay.

The objective of the invention is to reduce the consumption of expanded clay.

The technical result is achieved in that the raw mix for the manufacture of lightweight concrete, including cement, expanded clay, water, contains expanded clay fractions of 5-10 mm and optionally crushed into fractions of not more than 0.8 mm of spent automobile tires based on nitrile rubbers, in the following the ratio of components, wt.%: cement 27.5-28.5, the specified expanded clay 30.5-33.6; water 14.5-18.1; the specified ground car tires 19.8-27.5.

To prepare the concrete mixture, the raw materials are prepared and dosed: cement, expanded clay fractions of 5-10 mm, water, used automobile tires based on nitrile rubbers crushed into crumbs no more than 0.8 mm in size. Since rubber crumb, being a finely dispersed material, has a residual static stress, its individual particles collect due to mutual attraction, forming a bound loose material. With mechanical action, the attractive forces are weakened and the crumb rubber begins to "dust". To eliminate the effect of "dusting" rubber crumb is mixed with expanded clay. The particles of crumb rubber coagulate around the expanded clay particles, thereby weakening their mutual attraction and residual static stress.

The composition of the raw mix and the characteristics of lightweight concrete are given in table 1.

Table 1 Components Content, wt.%: composition No. 1 composition No. 2 Cement 27.5 28.5 Expanded clay 30.5 33.6 Water 14.5 IR, 1 Crushed car tires 27.5 19.8 The compressive strength of concrete, MPa 3.2 4.8 The density of concrete, kg / m ³ 720 950

The raw material mixture for the manufacture of lightweight concrete is prepared as follows. Water is added to the mixture of dry components (Table 1) and everything is thoroughly mixed. The prepared mixture is placed in metal (pre-lubricated with mineral oil) molds and fed to a heat-moisture treatment, which is carried out according to the regime of 3 + 9 + 3 hours at an isothermal exposure temperature of 90 ° C. Then the finished product is removed from the molds and transported to a warehouse where the material “ripens”.

Using the proposed mixture allows to obtain light and durable products, while reducing the consumption of expanded clay and utilized a large amount of rubber waste.

Information sources

1. SU 1276650 A1, 1986.

Claims (1)

Raw mix for the manufacture of lightweight concrete, including cement, expanded clay, water, characterized in that it contains expanded clay fractions of 5-10 mm and optionally crushed into crumbs fractions of not more than 0.8 mm spent automobile tires based on nitrile rubbers in the following ratio of components, wt.%:
cement 27.5-28.5 specified expanded clay 30.5-33.6 water 14.5-18.1 specified shredded car tires 19.8-27.5