Stowing composition

FIELD: mining.

SUBSTANCE: stowing composition comprising portland cement, plastifying agent, fine-grained filler - sand and water, additionally comprises as a binder the milled tailings of wet magnetic separation of ferrous quartzites with an average particle size of 2.071 microns, as a plastifying agent - superplasticiser SP-1, and the sand with an average particle size of 62.26 microns with the following ratio of components, wt %; the said cement - 13.48; the said sand - 56.43; the said wastes - 2.70; superplasticiser SP-1 - 0.138; water - the rest.

EFFECT: decrease in cement consumption, and increase in the strength of the stowing composition, use of sand with a lower fineness modulus.

1 ex, 2 tbl

 

The invention relates to the mining industry and can be used in the development of mineral deposits with the mined-out space.

Known filling composition comprising cement, fine aggregate and water in the following ratio, wt.%: cement - 15,54; fine aggregate (tailings disseminated ores of the Norilsk concentrator) - 61,49; water - the rest [Montanov A.N. The formation of the filling mass in the development of diamond deposits in permafrost. - M.: Publishing house "Mountain book", 2005 - 597 S. - S].

The disadvantages of this mixture are low strength (2,3 MPa at 28 days of age) with a large amount of cement.

Known filling composition comprising cement, fine aggregate and water in the following ratio, wt.%: cement - 15; fine aggregate (tails concentrators) - 50; water - the rest [Montanov A.N. The formation of the filling mass in the development of diamond deposits in permafrost. - M.: Publishing house "Mountain book", 2005 - 597 S.-S.]

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, Belousov, Zyryan and Mirgalimsai factories respectively) with increased consumption of cement.

The closest before agemono invention is a filling composition, contains Portland cement M400, plasticizing additive (lsls), fine aggregate (fine sand, fractional composition shown in table 1) and water in the following ratio of components, wt.%: cement - 14,79; LST - 0,170; aggregate - 62,47; water - the rest [Montanov A.N. The formation of the filling mass in the development of diamond deposits in permafrost. - M.: Publishing house "Mountain book", 2005 - 597 S. - S].

The disadvantage of this composition is low in a sufficiently large amount of cement strength (concrete grade M30, this mark corresponds to the strength of 3 MPa).

The task of the invention is to reduce the consumption of cement and increase the strength of the backfill composition, the use of sand with a lower fineness modulus.

Full balance on sieve No. 063 from 10 to 30% sand refers to small, less than 10% is very small. The fineness modulus of fine sand 1.5-2 mm, very small 1-1 .5 mm [GOST 8736-93. Sand for construction works. Technical specifications].

To achieve the objectives of the proposed backfill composition comprising Portland cement, plasticizing additive, fine aggregate - sand and water, and as the binder further comprises a ground tailings wet magnetic separation of iron ore with an average particle size of 2,071 μm, as the e plasticizing agents - superplasticizer SP-1, and sand with an average particle size of 62,26 μm, in the following ratio of components, wt.%: the specified cement - 13,48; specified sand - 56,43; specified waste - 2,70; superplasticizer SP-1 was 0.138; water - the rest.

The technical result - reduction of Portland cement, increasing the strength of the array, use sand with a lower fineness modulus.

According to the official site: http://www.ktprom.ru/plast.htm, http://www.polyplast-un.ru/products/2810/17274 - superplasticizer SP-1 is a synthetic organic substance on the basis of a product of condensation of naphthalenesulfonate and formaldehyde with a specific ratio of fractions of different average molecular weight, polynaphthalenesulfonate or methylenbis (naphthalenesulfonate) of sodium. Classification GOST 24211 refers to plastifitsirujushchej-water-reducing mind - superplasticizers. Chemical composition: methylenbis (naphthalenesulfonate) sodium or polynaphthalenesulfonate. Superplasticizer SP-1 produced according to TU 5870-005-58042865-05 and designed (use):

- to increase the workability and formemost concrete mixes without compromising strength and performance durability of concrete (at constant water-cement ratio);

for a substantial improvement of physico-mechanical characteristics and building technical the properties of concrete by reducing water consumption and constant workability);

- to improve the workability of concrete mixtures and improve the physico-mechanical and structural properties of concrete (while reducing the water / cement ratio and increasing the workability);

- to reduce cement consumption without reducing the workability of concrete mixture, physico-mechanical and structural properties of concrete by reducing the water content in concrete mix).

Example.

Tailings wet magnetic separation of ferruginous quartzite, crushed in a laboratory planetary mill Pulverisette 5 to an average particle size of 2,071 microns, mixed with cement PC, with sand with an average particle size of 62,26 μm and closed the water in which the previously added superplasticizer SP-1. The final mixture was mixed to a uniform consistency. The resulting mixture is prepared samples of size 70×70×70 mm, the Samples were kept in a climatic chamber for 2-3 days before reaching the Stripping strength of the samples. In the chamber was maintained temperature 20±20°C and relative humidity of 90-95%. After demoulding, the specimens were again placed in the climatic chamber for further hardening, after which he determined the mechanical strength using a test machine Instron 5882.

The following results are obtained: mechanical the Kai strength - 3,5 MPa (M35 grade of concrete) at the age of 28 days, 6,44 MPa at the age of 180 days at a flow rate of cement 13,38%. The diameter of the spot spreading on Attardo - 16,5 see

In the prototype when the cement content 14,79% grade of concrete - M30.

Table 1
Fractional composition of fine-grained sand
Sand:Fractions, mm
>105-102,5-51,25-2,50,63-1,250,315-0,630,14-0,315<0,14
- prototype-
PE, %
1,31,01,00,50,79,543,043
- sawla-
emnd composition, %
11,5388,47

In the tables the 2 is the source of the gross composition of the mixtures and the results of testing the mechanical strength of the samples, prepared from these mixtures.

Table 2
No.The flow of components (wt.%) in the manufacture of filling mixturesGrade of concrete backfill composition
Portland cementThe sandTailings wet magnetic separationSP-1LSTWater
The placeholder14,7962,47--0,17022,57M30
Sawla-Amy13,4856,432,70was 0.138-27,252M35

From table 2 it follows that the task of increasing the mechanical strength of filling the composition of the prototype (concrete grade M30) by reducing the cement and sand with a smaller module coarsely the tee is achieved by adding crushed tailings wet magnetic separation of iron ore with an average particle size of 2,071 μm and used as plasticizing agents superplasticizer SP-1.

Backfill composition comprising Portland cement, plasticizing additive, fine aggregate - sand and water, characterized in that as the binder further comprises a ground tailings wet magnetic separation of iron ore with an average particle size of 2,071 μm, as plasticizing agents - superplasticizer SP-1, and sand with an average particle size of 62,26 μm in the following ratio, wt.%:

The specified cement13,48
The specified sand56,43
These wastes2,70
Superplasticizer SP-1was 0.138
Waterrest



 

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Concrete mixture // 2530038

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1 tbl

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