UA53569A - Cement-mineral dry mix for making drift belts - Google Patents

Abstract

Cement-mineral dry mix for making drift belts includes binding agent as portland cement, silicon-containing component – sand, amorphous silica, curing accelerator as dewatered salts.

Description

Description of the invention

The proposed invention relates to the mining industry, namely to the mixtures for the construction of 2 wheeled lanes in coal mines.

A well-known tamponage composition for fastening the bottom-hole zone of the formation, which contains cement, sand, sodium chloride and a mixing liquid, while it additionally contains phosphochalk, and as a mixing liquid - an aqueous solution of sodium chloride (patent of the Russian Federation Mo2005165, E21833/138, published on December 30. 93)

The disadvantages of the known composition include low water resistance, permeability and strength of the hardened 70 material, insufficient storage time of the viscous-liquid state of the mixture mixed with liquid.

The closest, in terms of technical essence, to the claimed invention is tamponage cement, which contains a binder, a silica-containing component and an admixture, while it contains Portland cement as a binder, sand as a silica-containing component, and sand as an admixture - gypsum and alumina containing material, with the following ratio of components, wt. 9o:

Portland cement 40 - 68 sand 20 - 35 gypsum 2-10 alumina containing material 2-15

IA.s. Mo1089242, E21833/138, published 04/30/84

The disadvantages of the well-known tamponage cement are insufficient strength of the hardened mixture, inefficient consumption of building materials, insufficient storage time of the viscous-liquid state of the mixture mixed with water, during hydromechanical transportation to the place of tamponage.

The basis of the invention is the task of improving the cement-mineral dry mixture for the construction of striated strips, in which the addition of amorphous silica, a hardening enhancer in the form of anhydrous salts, for example calcium chloride, and quartz sand with a coarseness modulus of 1.0 is used as sand. - 3.0, with the following ratio of components, wt.9o: (22)

Portland cement 35-45 quartz sand 50 - 60 i-oi amorphous silica 3.0 - 5.0 IC hardening accelerator in the form of dehydrated salts, for example calcium chloride 1.4-3.0 s provide an increase in the strength of the water-dissolved mixture, this ensures an increase in the viscous-liquid state of the mixture closed with water, convenience in operation, saving construction materials, due to the fact that the dry mixture is delivered in a package directly to the place of construction of the strips, where it is mixed with water, while the path of its delivery by hydromechanical method is shortened.

The task is solved by the fact that in the cement-mineral dry mixture for the construction of "420 Koloshtrekovy strips, which contains a binder in the form of Portland cement, and as a silica-containing component - sand, according to the invention, the following exceptions are provided: and - the mixture additionally contains amorphous silica, a hardening enhancer, in the form of dehydrated salts, "" for example, calcium chloride, and quartz sand is introduced as sand, with a coarseness modulus of 1.0 - 3.0; - all components are taken in the following ratio, wt.9o: " sl portland cement 35-45 quartz sand with a grain modulus of 1.0 -3.0 50 - 60 o amorphous silica 3.0 - 5.0 4! hardening enhancer in the form of dehydrated salts, for example calcium chloride 1.4-3.0, y and su. . b" In addition, crushed carbonate rock of fractions from dusty to 2.Omm, U is additionally introduced into the mixture

Ge) in the amount of 10 - 2095, instead of the same particles of cement and sand, and to increase the time stabilization of the viscous - liquid state of the mixture mixed with water, sucrose, for example, beet sugar, in the amount of 0.05 - 0, was additionally introduced to it. 1595 from the mass of cement.

The cement-mineral dry mixture for the construction of kerosene strips is prepared as follows.

Mixtures based on Portland cement are materials with a slow vn. increasing strength, to which hardening accelerators are added for acceleration.

Known effective hardening accelerators contain water, which is not suitable for dry cement-mineral mixtures. In the proposed dry mixture, dehydrated salts are introduced, for example, calcium chloride obtained as a result of special drying, which can be mixed with portland cement and dry inert fillers for a long time, while the optimal dosage of dehydrated salts, for example, calcium chloride in a water-mixed solution obtained from of dry mixture - 30 - dOkg/m, and for 1t - 15 - ZOkg, or 1.5 - Z,Omas.oo

Due to the fact that cement-mineral mixtures in the water-solid ratio, which forms a cast consistency, 65 are prone to delamination, microsilica (microsilicon), for example, ferrosilicon production waste, is introduced into the dry mixture in the form of amorphous silica dust, which is captured by dry dust and gas treatment filters. -D-

It has been experimentally proven that the amount of amorphous silica - 3.0 - 5.Omas.Uo in the dry mixture provides a stable effect, significantly reduces water separation and allows maintaining a sufficiently uniform granulometry of the cast cement-mineral mixture.

For the preparation of a cement-mineral dry mixture, quartz sand, with a coarseness modulus of 1.0 - 3.0, in the amount of 50 - 6095 wt., fast-hardening Portland cement, grade not lower than 500, is loaded into the mixer sequentially, with continuous mixing, in the amount of 50 - 6095 wt., amorphous silica, for example microsilicon - 3.0 - 5.095, hardening accelerator in the form of dehydrated salts, for example calcium chloride, in the amount - 1.4 - 3.095. The dry mixture obtained in this way is packaged in special 7/0 bags and in this form is delivered to the mine, to the place of construction of the grinding strips, where water is poured into the mixer and the dry mixture is loaded, mixed. The resulting mixture has a viscous-liquid consistency, which allows it to be transported by hydromechanical means into the formwork elements of the wheel strip for 20-30 minutes or more.

At the same time, the strength of the hardened mixture is ensured. After 24 hours - 7.0 - 15.0 MPa, and after 28 days - 7/5 35.0 - 40.0 MPa.

To accelerate the increase in strength, crushed carbonate rock of fractions from dusty to 2.0 mm is added to the mixture, in the amount of 10 - 2095, instead of the same particles of cement and sand, and to increase and stabilize the time of the viscous - liquid state of the mixture mixed with water, sucrose, for example, beet sugar, is additionally introduced in the amount of 0.05 - 0.15 of the mass of cement.

Example 1. With continuous mixing, quartz sand with a coarseness modulus of 1.69 - 1.2, in the amount of 528 kg, portland cement of the M5O00 brand - 43 kg, amorphous silica (microsilicon) - 30 kg, is sequentially loaded into the mixer, mixed thoroughly in the mixer, packed in special bags , which is delivered to the mine, to the place of construction of the wheel strip, where it is mixed with water in a mixer and pumped into the formwork elements of the wheel strip by hydromechanical means.

The initial mobility of the mixture (according to the Suttard viscometer) is 155 - 1b0mm, the time for the mixture to thicken is less than 40 minutes, the compressive strength: after 24 hours - 2.3MPa, after 28 days - 24.3MPa. "

Cement-mineral mixtures МоМо2 - 5 listed in table Мо1 are obtained similarly. The main physical and mechanical indicators of the above mixture compositions are given in table Мо2.

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Ge" 50 The application of the proposed invention will make it possible to produce a ready-made dry mixture, which is packaged in special bags and, if necessary, to deliver it in this form to the mine, directly to the place of construction of sr wheel-strip strips, where it is mixed with water and hydromechanically transported into the formwork strip elements. The mixture mixed with water forms a viscous-liquid consistency, suitable for hydromechanical transportation within 20 - 55 minutes, and the introduction of chemical impurities into the mixture, such as amorphous silica, 50% crystalline calcium, which regulate the hardening and hardening of cement, transfer the mixture to the category of fast-hardening , with obtaining strength after a day - 7.0 - 15.0MPa.

These advantages contribute to a significant saving of building materials, a reduction in the cost and simplification of the technological process of construction of multi-track strips.

The declared mixture was tested during the construction of slatted tracks in the mine and showed positive 60 results.

Claims (1)

Formula of the invention b5 1. Cement-mineral dry mixture for the construction of grouting strips, containing a binder in the form of Portland cement, and as a silica-containing component - sand, which is distinguished by the fact that it additionally contains amorphous silica, a hardening accelerator in the form of dehydrated salts, for example, chloride of calcium with the following ratio of components, mass.9o: Portland cement 35-45 quartz sand with a grain modulus of 1.0-3.0 50-60 amorphous silica 3.0-5.0 hardening accelerator in the form of dehydrated salts, for example calcium chloride 1, 4-3.0. 70 2. The mixture according to claim 1, which differs in that additionally crushed carbonate rock of fractions from dusty to 2.Omm in the amount of 10-2095 is added to it instead of the same particles of cement and sand. Z. The mixture according to claim 1, which differs in that sucrose is additionally added to it, for example, beet sugar in the amount of 0.05-0.1595 by weight of cement. /5 Official Bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2003, M 1, 15.01.2003. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. « (o) Zo Te) IF) (ze) Is) - and? 1 (95) 1 (o) iChe) 60 b5