SU1423528A1 - Compound for manufacturing building articles - Google Patents

Abstract

The invention relates to compositions for the manufacture of building products. The purpose of the invention is to increase the strength and reduce water absorption. The composition for the manufacture of building products contains, in May.%: Portland cement 32-42, bauxite slurry 18-30, lime containing baked sugar production waste 25-30, spent the rest. Compressive strength of products 43 - 56 MPa, bending 18.5-21 NPA, water absorption 3.0-5.7%. 1 tab.

Description

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This invention relates to a composition of building products.

The purpose of the invention is to increase the strength and reduce water absorption. The starting components for making the mixture according to the invention are:

Portland cement mark 400, spent sovelit, whose chemical composition, in May. %: MgC03 38.01 CaCOj 45.20 SiOj 7.12; MgO 7.0; 0.13; 0.10 and water bound 2.44. The waste material, as waste, is formed during the dismantling of thermal units, it is characterized by a flaky substance content, in which there are 60-70% of fibers with a length of 2-15 mm, preferably 2-5 mm. The volumetric mass of such a waste water body is 250-270 kg / m. Since sovelit contains water-resistant compounds, magnesium hydrosilicates, its use with bauxite sludge also contributes to an increase in water resistance and thus

| affects the decrease in water absorption of products;

j bauxite sludge - waste from an aluminum plant (specific surface area 100) 1 t. the following chemical composition, us,%: SiO 25.0, 24.7; Fe-jOj 26.0; CaO 1.1; R-iO 9.4 and the loss during the rest of the prok Livania. Zokitovy sludge in a natural state is inert and does not possess properties; en activated by calcined lime waste from sugar production; . The weight of the waste is sugar production, burned at 900-950 C (for 1-2 hours, with a specific surface of about 350 m / kT, activity 5–8% (CaO + MgO), chemical composition, wt.%: SiOi 3 , 18, 5.32; 2.01; CaO 84.96; MgO 2.17; Loss on ignition; the rest. These wastes are highly aktivnost and reactivity, play the role of an activator of curing bauxite sludge, contributing to the The euition of low-base hydrosilicates and calcium hydroaluminates is already in her - trecTBBHHbix conditions - without hydrothermal treatment.

Mass preparation technology According to the present invention, the operations include dosing, mixing:

ABOUT

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components and molding products. To do this, Portland cement is mixed at the beginning with pre-mixed bauxite slurry and calcined waste in the presence of part of the water. Then, spent sovelite and residual water are introduced and everything is mixed for 3--5 minutes. The amount of water for mixing the mixture corresponds to a water-solid B / T ratio of 0.20. The molding is carried out by pressing under a pressure of 20 MPa into metal molds with dimensions of 40 x 40 x 160 mm. The hardening of the samples is carried out under natural-humid conditions. When grown for 28 days, the samples are dried to constant weight and subjected to the determination of properties.

PRI im p 6 compositions of the initial raw materials are prepared for the preparation of the mixture according to the invention.

Characteristics of the compositions and indicators of the technical properties of the products obtained are given in the table.

The material based on the proposed mass is created by the interaction of a combined binder based on Portland cement and calcareous bauxite in the tense with an asbestos-containing component - spent sediment. In this composition, bauxite sludge is activated, its compounds — aluminates, ferrites, calcium silicates, usually representing an inert conglomerate that does not have tampering properties — are burned with lime waste under the influence of I and are subjected to hydration.

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As can be seen from table 11; s, the advantage of the proposed composition over the known one is in saving the expensive portland cement (about 40-50%), in increasing the strength (especially in bending) and in reducing the water absorption of the products.

F o r mula inventions

A composition for the manufacture of building products, including Portland cement and spent sovelit, distinguished by the fact that, in order to increase strength and reduce water absorption, it contains

additionally bauxite sludge and calcined calcined waste produced in the following ratio of components, May,%: Portland cement 32-42 Bauxite slime 18-30

Calcined lime containing waste of sugar production Spent

Components, wt.%:

Portland cement

spent sovelit

bauxite slime

lime containing burnt sugar production

sulphite cellulose

4257.1 62.0

1529.4 24.8

1825

63.8 26.8

Claims (1)

Claim Composition for the manufacture of construction products, including Portland · 55 cement and spent sovelite, characterized in that, in order to increase strength and reduce water absorption, it additionally contains bauxite sludge and lime-containing calcined waste from sugar production in the following ratio of components, May . %: Portland cement 32-42 Bauxite sludge 18-30 Lime-containing calcined waste sugar production 25-30 Spent sovellit Else Indicators The proposed composition According to the prototype 1 1 1 1 b 1 1 1 1______ 3 1 P 1 1 1 1 csl 1 1 1 1 1 Components, wt.%: Portland cement 32 37 42 57.1 62.0 63.8 spent sovelit 8 12 fifteen 29.4 24.8 26.8 bauxite sludge thirty 24 18 - - - lime-containing burnt waste of sugar production thirty 27 25 sulphite-pellulose bard - - 4.9 5.7 6.4 aluminum fluoride waste - - - 8.6 7.5 s oh Properties Bulk weight, kg / m ^E 1880 1780 1750 1550 1610 1670 Compressive strength, MPa 56 47 43 fifteen 18 20 G Bending Strength, MPa 21 20 18.5 1.8 2,4 3.3 Water absorption,% 3.0 3.8 5.7 18 17.5 14