RU2565288C1 - Composite material for backfilling of mined-out space - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: composite material for backfilling of the mined-out space, comprising cement, the plasticising agent, fine-grained filler - waste of enrichment of wet magnetic separation of ferruginous quartzites and water, differing in that it in addition contains chrysotile asbestos - chrysotile, at the following ratio of components, wt %: cement - 12.8%; waste of enrichment of wet magnetic separation of ferruterous quartzites - 62.86; supersoftener Poliplast SP-1 - 0.226; chrysotile asbestos - chrysotile - 0.422%; water - the rest.

EFFECT: increase of strength of backfilling composite material.

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Description

The invention relates to the mining industry and can be used in the development of mineral deposits with the laying of the developed space.

Known filling composite material, including cement, fine aggregate and water in the following ratio of components, wt.%: Cement -15.54; fine aggregate (tailings of disseminated ores from Norilsk ore dressing plant) - 61.49; water - the rest [see Montyanova A.N. The formation of stowage arrays during the development of diamond deposits in the permafrost zone - M .: Publishing House "Mountain Book", 2005 - 597 p. - from. 91].

The disadvantages of this mixture are low strength (2.3 MPa at the age of 28 days) with high cement consumption and the lack of data on the value of tensile strength in bending.

Known filling compositions, including cement, fine aggregate and water in the following ratio of components, wt.%: Cement - 15; fine aggregate (tailings of concentration plants) - 50; water - the rest [see Montyanova A.N. The formation of stowage arrays during the development of diamond deposits in the permafrost zone - M .: Publishing House "Mountain Book", 2005 - 597 p. - from. 147].

The disadvantages of this mixture are also low strength (1.2; 1.3; 1.5; 2.5 MPa at the age of 28 days when using the tails of Zhezkazgan, Belousovskaya, Zyryanovskaya and Mirgalimsaysky factories, respectively) with increased cement consumption and the lack of data on the value tensile strength in bending.

Closest to the proposed invention is a filling composite material containing cement CEM II 32,5АШ, plasticizing additive (SP-1), fine aggregate (waste enrichment wet magnetic separation of ferruginous quartzite) and water in the following ratio of components, wt. %: cement - 15.3; SP-1 - 0.1; placeholder - 55.77; water - the rest [Lesovik G.A. Stowing mixtures based on industrial waste / dissertation abstract for the degree of candidate. tech. Sciences - Belgorod, 2013 - 24 p. - from. 19-20 (composition 4, table 7)].

The disadvantages of this composition is the low compressive and tensile strength in bending with a sufficiently large consumption of cement - 1.5 MPa and 0.468 MPa, respectively, at the age of 28 days.

The task of the invention is to increase the strength of the filling composite material in compression and tension during bending.

To solve this problem, a composite material is proposed for laying the mined-out space, including cement, a plasticizing additive, a fine-grained aggregate — waste enrichment of wet magnetic separation of ferruginous quartzite and water, characterized in that it additionally contains chrysotile asbestos — chrysotile, in the following ratio of components, wt.% : cement - 12.8%; enrichment waste of wet magnetic separation of ferruginous quartzites - 62.86; superplasticizer SP-1 - 0.226; chrysotile asbestos - chrysotile - 0.422%; water is the rest.

The technical result is an increase in the strength of the array in compression and tension during bending.

According to the official website: http://www.polyplast-un.ru/products/stroitelnaya-otrasl/dobavki-dlya-betonov/superplastifikatoryi.html - superplasticizer SP-1 is an organic synthetic substance based on the condensation product of naphthalenesulfonic acid and formaldehyde with a specific the ratio of fractions with different average molecular weights is sodium polynaphthalenemethylene sulfonate or methylenebis (naphthalenesulfonate). According to the classification, GOST 24211 refers to a plasticizing-water-reducing type - superplasticizers. Chemical composition: methylenebis (naphthalenesulfonate) sodium or polynaphthalenemethylene sulfonate. Superplasticizer SP-1 is produced according to TU 5870-005-58042865-05 and is intended (used):

• for a sharp increase in workability and formability of concrete mixtures without reducing the strength and durability of concrete (with a constant water-cement ratio);

• to significantly increase the physical and mechanical properties and the construction and technical properties of concrete (while reducing water consumption and constant workability);

• to increase the workability of concrete mixtures and to increase the physical and mechanical properties and the construction and technical properties of concrete (while reducing the water-cement ratio and increasing workability);

• to reduce cement consumption without reducing the workability of the concrete mixture, physico-mechanical properties and construction and technical properties of concrete (while reducing the water content of the concrete mixture).

Chrysotile asbestos - chrysotile is produced by Uralasbest OJSC according to GOST 12871-93, TU 5721-01-028-1476, TU 21-22-23.

Example

Cement CEM II 32.5АШ was mixed with the enrichment waste of wet magnetic separation of ferruginous quartzites with an average particle size of 75.76 μm and chrysotile asbestos - chrysotile and mixed with water, to which the Polyplast SP-1 superplasticizer was previously added. The final mixture was mixed until a uniform consistency. Samples of the filling composite material 70X70X70 mm and 40X40X160 mm in size were prepared from the resulting mixture. The samples were kept in a climatic chamber for 2-3 days until the stripping strength of the samples was achieved. A temperature of 20 ± 20 ⁰ С and a relative humidity of 90-95% were maintained in the chamber. After forming, the samples were again placed in a climatic chamber for further hardening for 28 days, after which the mechanical compressive and tensile bending strengths were determined using an Instron 5882 electronic testing machine.

The following results were obtained: tensile strength under compression - 3.96 MPa and tensile bending - 1.98 MPa at the age of 28 days with a cement consumption of 12.8%.

In the prototype, with a cement content of 15.3%, the compressive strength is 1.5 MPa and tensile bending is 0.468 MPa at the age of 28 days.

The table shows the initial gross composition of filling composite materials and the results of tests of the mechanical strength of samples prepared from these materials.

Experimental data

No. Consumption of components (wt.%) In the manufacture of filling composite materials The ultimate tensile strength, MPa Tensile strength in bending, MPa Cement CEM II 32.5ASH Wet Magnetic Separation Waste Asbestos SP-1 Water Prototype 15.3 55.77 - 0.1 28.83 1,5 0.468 The claimed 12.8 62.86 0.422 0.226 23,692 3.96 1.98

The table shows that the task of increasing the strength of the bookmark in compression and tension during bending by 2.64 and 4.23 times, respectively, is achieved by introducing chrysotile - chrysotile in the amount of 0.422% by weight of the material into the material.

Claims (1)

Composite material for laying out the developed space, including cement, a plasticizing additive, a fine-grained aggregate - waste enrichment wet magnetic separation of ferruginous quartzite and water, characterized in that it additionally contains chrysotile asbestos - chrysotile, in the following ratio, wt.%:
Cement 12.80 Indicated waste 62.86 Indicated Asbestos 0.422 Superplasticizer SP-1 0.226 Water rest