RU2494079C1 - Crude mixture for making light concrete - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to the industry of construction materials and specifically to making light concrete. The crude mixture for making light concrete contains the following, wt %: portland cement 19 - 21, quartz sand 54.3-59.1, ground foamed polyurethane wastes with particle size of 5-15 mm 2 - 3, industrial foam prepared from 4% aqueous solution of foaming agent PB-2000 19-21, superplasticiser S-3 0.7-0.9.

EFFECT: low consumption of portland cement in the crude mixture while increasing strength of light concrete.

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Description

The invention relates to the building materials industry, in particular, to the production of lightweight concrete.

A known mixture for the manufacture of lightweight concrete, including, wt.%: Portland cement 25-60; silica sand 0-30; crushed waste polyurethane foam fraction 5-15 mm 0.5-3.5; technical foam (1% aqueous solution of amine oxide) [1].

The objective of the invention is to reduce the consumption of Portland cement in the composition of the raw mix.

The technical result is achieved by the fact that the raw material mixture for the manufacture of lightweight concrete, including Portland cement, quartz sand, crushed waste polyurethane foam fraction 5-15 mm, technical foam, as technical foam contains foam prepared on the basis of a 4% aqueous solution of the blowing agent PB-2000 and additionally, C-3 superplasticizer in the following ratio of components, wt.%; Portland cement 19-21; silica sand 54.3-59.1; crushed waste polyurethane foam fraction 5-15 mm 2-3; the specified technical foam 19-21; superplasticizer C-3 0.7-0.9.

The compositions of the raw mix for the manufacture of lightweight concrete are given in the table.

As technical foam, a 4% aqueous solution of the PB-2000 foaming agent is used, which meets the requirements of TU 2481-185-05744685-01, density 1000-1200 kg / m ³ , pH 7-10, the multiplicity of the working solution foam with a volume fraction of the foaming agent is 4%, foam stability not less than 360 s. As part of the raw material mixture, Portland cement grade 400 is used; any quartz sand; C-3 superplasticizer obtained on the basis of condensation products of naphthalenesulfonic acid and formaldehyde.

Components Composition, wt.%: one 2 3 Portland cement 19 twenty 21 Quartz sand 59.1 56.7 54.3 Crushed waste of polyurethane foam fraction 5-15 mm 2 2,5 3 Technical foam prepared on the basis of a 4% aqueous solution of the PB-2000 foaming agent 19 twenty 21 Superplasticizer S-3 0.9 0.8 0.7

To prepare the raw mix, the raw materials are prepared and dosed. Portland cement and quartz sand are mixed. After preparing technical foam with constant stirring, a mixture of Portland cement and quartz sand is introduced into it, then crushed polyurethane foam waste and C-3 superplasticizer are added. The prepared mixture is evenly distributed over the area of metal forms pre-oiled and left to harden. Then the finished product is removed from the molds and transported to the warehouse. The compressive strength of the products will be 3-4 MPa.

The source of information

1. RU 2351574, 2012.

Claims (1)

The raw material mixture for the manufacture of lightweight concrete, including Portland cement, quartz sand, crushed waste polyurethane foam fraction 5-15 mm, technical foam, characterized in that as technical foam contains foam prepared on the basis of a 4% aqueous solution of the blowing agent PB-2000 and additionally, C-3 superplasticizer in the following ratio of components, wt.%:
Portland cement 19-21 quartz sand 54.3-59.1 crushed waste polyurethane foam fraction 5-15 mm 2-3 specified technical foam 19-21 superplasticizer C-3 0.7-0.9