RU2568657C1 - Backfilling composite material - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: backfilling composite material including cement, plastifying addition, fine filler - wastes of enrichment of wet magnetic separation of ferruginous quartzites with average particle size 75.76 mcm and water, additionally contains rubber powder with average size of particles 222 mcm, at the following ratio of components in wt %: cement - 12.80; said wastes - 62.35; rubber powder - 1.00; superplasticizing agent SP-1 - 0.15; water - rest.

EFFECT: increased strength of massive during tension, and bending.

2 tbl, 1 ex

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.

The closest to the present 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, 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 with a sufficiently large consumption of cement tensile strength in bending (0.468 MPa at the age of 28 days).

The task of the invention is to increase the strength of the backfill composite material in tension under bending.

To solve this problem, a filling material has been proposed, including cement, a plasticizing additive, a fine-grained aggregate - waste enrichment of wet magnetic separation of ferruginous quartzite and water, in addition it additionally contains rubber powder, in the following ratio, wt.%: Cement - 12.80; specified waste - 62.35; rubber powder - 1.00; superplasticizer SP-1 - 0.15; water is the rest.

The technical result is an increase in the strength of the array under tension in 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 physico-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 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, physical and mechanical properties and construction and technical properties of concrete (while reducing the water content of the concrete mixture).

Example

Cement CEM II 32.5АШ was mixed with the waste from the enrichment of wet magnetic separation of ferruginous quartzites (the chemical composition is given in Table 1) with an average particle size of 75.76 μm and rubber powder with an average particle size of 225 μm and mixed with water, to which the superplasticizer SP was previously added -one. The final mixture was mixed until a uniform consistency. Samples of filling composite material 40 × 40 × 160 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. In the chamber, a temperature of 20 ± 20 ° C and a relative humidity of 90-95% were maintained. After forming, the samples were again placed in a climate chamber for further hardening for 28 days, after which the mechanical tensile strength in bending was determined using an Instron 5882 electronic testing machine.

The following results were obtained: tensile strength in bending - 1.4 MPa at the age of 28 days at a cement consumption of 12.8%.

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

Table 2 shows the initial gross composition of filling composite materials and the results of testing the mechanical strength of samples prepared from these materials.

The table shows that the task of increasing the tensile strength of the bookmark in bending by 2.99 times is achieved when rubber powder is introduced into the material in an amount of 1% by weight of the material.

Claims (1)

A composite filling material, including cement, a plasticizing additive, a fine-grained aggregate — waste products for enrichment of wet magnetic separation of ferruginous quartzites and water, characterized in that it contains enrichment waste for wet magnetic separation of ferruginous quartzites with an average particle size of 75.76 μm and additionally contains rubber powder with an average particle size 225 μm, in the following ratio of components, wt.%:
Cement 12.8 Indicated waste 62.35 Rubber powder 1.00 Superplasticizer SP-1 0.15 Water rest