RU2542074C1 - Cement-free binder - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: slag includes acid electrolyte with solution density ρ=1.310 g/cm³, and slag of steel-smelting production is electric steel-smelting slag. The cement-free binder including slag of steel-smelting production, burnt rocks of mine dump and slag produced as a result of neutralisation of spent electrolytes of acid accumulators by lime, contains electric steel-smelting slag as slag of steel-smelting production, and slag contains electrolyte with solution density ρ=1.310 g/cm³ at the following ratio, wt %: burnt rocks 14, steel-smelting slag - electric steel-smelting 78, slag 8.

EFFECT: increased strength.

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Description

Cementless BINDER

The invention relates to the construction materials industry, namely to cementless compositions of binders from industrial wastes. Effect: increase the strength of a cementless binder (obtaining strength at the age of 28 days at least Ml00).

The known composition of a cementless binder [1], including ground slag of steelmaking (open-hearth), after magnetic separation with the separation of metal inclusions - scrap, grains, and sludge obtained by neutralizing the spent pickling solutions of Magnitogorsk calibration plant, with the following ratio of components, mass. %:

Steelmaking slag (open-hearth) 90 Sludge 10

A disadvantage of the known composition is the low strength at the age of 28 days - 3.6 MPa.

The closest technical solution is cementless cementitious mixtures [2] of technogenic products ground in planetary mills containing slag of steelmaking (open-hearth, converter), after magnetic separation with the separation of metal inclusions (scrap, grains), and burnt rock with the addition of sludge obtained by neutralization lime spent electrolyte acid batteries with a solution density ρ = 1,266 g / cm ³ (the main properties of the electrolyte are presented in table 1), with the following ratio Ponents, mass. %:

Steelmaking slag (open-hearth furnace, converter) 70-90 Burnt rocks 5-25 Sludge 7-8

Cementless binders of this composition also have a disadvantage: low strength at the age of 28 days 6.60-7.88 MPa.

The objective of the invention is to obtain higher strength at the age of 28 days (at least M100). This is achieved due to the fact that in a cementless binder, including steelmaking slag, burned rock and sludge obtained by neutralizing spent acid electrolytes with lime, electric steelmaking slag was used as steelmaking slag, and an electrolyte with a solution density of ρ = 1,310 g was taken as a slurry / cm ³ (the main properties of the electrolyte are presented in table 2), in the following ratio, mass. %:

Burnt rocks fourteen Steelmaking slag (electric steelmaking) 78 Sludge 8

For the preparation of the inventive binder are used:

- slag of steelmaking (electric steelmaking) of NKMK OJSC, the chemical composition of which in mass percent: SiO ₂ - 20.84; Al ₂ O ₃ - 8.10; FeO - 1.04; MnO - 0.55; CaO - 57.89; (including CaO.svob. - 0.71); MgO 11.58;

- burnt rocks of the mine dump of the Abashevskaya mine, the chemical composition of which in mass percent: SiO ₂ - 49.18; Al ₂ O ₃ - 17.62; Fe ₂ O ₃ - 6.52; FeO - 1.66; CaO 3.79; MgO - 7.61; SO ₃ - 1.27; K ₂ O + Na ₂ O - 11.23; the average density of 1.8 g / cm ³ ; mineralogical composition: clay shales - 48%, sand shales - 27%, sandstones - 20%, carbon shales - 3%, carbonate rocks - 2%;

- sludge resulting from the neutralization by lime of spent electrolytes of acid batteries with a solution density of ρ = 1,310 g / cm ³ .

A cementless binder was obtained in the following way: steelmaking slags (electric steelmaking) after magnetic separation with the separation of metal inclusions - scrap, grains and burnt rocks of a mine dump were ground in planetary mills to a specific surface of 340-350 m ² / kg with a mass ratio of 1: 0.18 and thoroughly mixed in dry form. The resulting mixture was closed with slurry obtained by neutralizing the spent electrolytes of acidic batteries with a solution density of ρ = 1.310 g / cm ³ with lime and a water-slurry ratio of 0.37, thoroughly mixing. The spreadability of the resulting mixture with a cone draft of 15.3 cm. The mixture was poured into a cube mold with a side of 7.07 cm, the samples were kept under natural conditions at a temperature of (20 ± 3) ° C and relative humidity (95 ± 5)% GOST 310.4-81. The tests were carried out in accordance with the requirements of GOST 310.2, GOST 310.3, GOST 310.4.

The strength of the inventive binder at the age of 28 days is 10.64 MPa (M100). The invention is illustrated by the test results shown in table 3.

From table 3 it is seen that the inventive composition has greater strength compared to the prototype.

Information sources

1. Voronin K.M. Stabilization of the structure and properties of open-hearth slag to increase the efficiency of its use in construction: Ph.D. tech. sciences. - Magnitogorsk: 1997 .-- S. 63.

2. Korneeva E.V. Cementless filling mixtures based on activated slag of steelmaking: Dis. Cand. tech. sciences. Novosibirsk: 2011 .-- P.6.

Claims (1)

Cementless binder, including slag from steelmaking, burned mine shaft slurry and sludge resulting from the neutralization of acid batteries by the used electrolytes with lime, characterized in that electric steelmaking slag was taken as steelmaking slag, and an electrolyte with a solution density of ρ = 1,310 was used as a slurry g / cm ³ in the following ratio, wt. %:
Burnt rocks fourteen Steelmaking slag - electric steelmaking 78 Sludge 8