WO2012074441A2

WO2012074441A2 - Process for preparing a concrete mix for manufacturing a ballast pipe and device for preliminary preparation of water for mixing a concrete mix

Info

Publication number: WO2012074441A2
Application number: PCT/RU2011/000952
Authority: WO
Inventors: Анатолий Петрович СВЕЧКОПАЛОВ; Игорь Иванович ШАПОРИН
Original assignee: Svechkopalov Anatoly Petrovich; Shaporin Igor Ivanovich
Priority date: 2010-12-03
Filing date: 2011-12-02
Publication date: 2012-06-07
Also published as: WO2012074441A3; RU2453515C1

Abstract

The process for preparing a concrete mix for manufacturing a ballast pipe comprises mixing the following components, in mass%: from 12% to 17% - sulphate-resistant Portland cement; from 4% to 10% - water; from 0.1% to 0.25% - plasticizing additive on the basis of polycarboxylate ether; remainder - barite ore. The fractions content of barite ore in mass% is: from 7% to 18% - large fraction with a particle size of from 3 mm to 25 mm; from 70% to 85% - small fraction with a particle size of from 0.16 mm to 3 mm; from 7% to 16% - very small fraction with a particle size of from 0.01 mm to 0.16 mm. The water for mixing the concrete mix is pre-processed by being passed through a gap in which a magnetic H field is maintained. The device for preliminary preparation of mixing water for the manufacture of a ballast pipe has a mixing water processing unit. A permanent magnet is installed inside the water processing unit so as to form a gap with respect to the inner wall of a hollow elongate element.

Description

A method of preparing concrete mixture for the manufacture of ballast pipes and a device for the preliminary preparation of mixing water for concrete mixture. The invention relates to the manufacture of ballast-coated pipes used in laying pipelines along the bottom of reservoirs or in wetlands, namely, to prepare a concrete mixture using sulfate-resistant Portland cement and a device for the preliminary preparation of mixing water for concrete mixing.

Particularly heavy concretes are known, including barite concrete, the density of which exceeds 2500 kg / m ³ (http://betony.ru), but the composition of particularly heavy concrete and the features of its use as ballast material for pipes are not given.

It is known that three fractions of aggregates are used in heavy concrete: coarse aggregate - with a grain size of 5 mm, fine aggregate - from 0.16 mm to 5 mm and very fine aggregate, which allows to increase both the density and strength of heavy concrete (GOST 26633-91 " Concrete heavy and fine-grained. Technical conditions "). This GOST regulates the density of aggregates up to 2800 kg / m, but does not regulate the density of heavy concrete.

Known concrete, including barite as a filler (application WO N ° 98/01402 from 07/07/1997). To increase the density, the aggregate has a predetermined particle size distribution, in which 8 mass% of barite is in the form of a very fine fraction with a particle size of from 0.0 Ι Μ to 1000 m; 4 mass% in the form of a fine fraction with a grain size of 1 mm to 3 mm; 10 mass% in the form of a large fraction with a grain size from Zmm to 7mm; fine quartz sand with a grain size of 0.1 mm to 3 mm; large fractions of gravel from Zmm. up to 75mm. The ratio of water to cement by weight is set in the range of 0.30 - 0.35. The composition has two main disadvantages: the first is the inability to obtain a ballast coating with a guaranteed density in excess of 2800 kg / m ³ due to the absence of restrictions on the coarse and fine aggregate used for materials and their density; the second is a small mass ratio of water to cement in the mixture (0.30 - 0.35), which does not allow the use of a slow-moving mixture with large fractions to fill the annular space between the conductive pipe and the shell by injection through holes in the covers.

The known composition of fine concrete RU 2306289 C2, obtained using activated water for mixing concrete. The specified method does not allow to obtain concrete strength not compressing 40 MPa.

A known method of processing water for mixing building mixtures A.S. 423767, the effect of which is achieved by the fact that the mixing water is exposed to a rotating magnetic field with a strength of 100-2000 A / cm at an industrial frequency of electric current and a water flow rate of 0.5-2.5 m / s.

The disadvantage of this method is the short duration of exposure to water of an electric field.

The composition of fine-grained concrete is known (Tebenikhin E.F. Reagent-free methods of water treatment in power plants. - 2nd ed. Revised and add. - M .: Energoatomizdat, 1985, p.10-1 1), which contains water, an astringent - cement, as a filler material - sand. Mixing water is magnetically treated.

The disadvantages of this mixture are:

- low bending strength of 2.84 MPa;

- low compressive strength of 13.3 MPa;

- high water absorption of 10.9%. The closest composition to the invention is the composition of fine-grained concrete (Bazhenov Yu.M. Concrete Technology. - M .: Higher School, 1987. P.246-252), which contains water, sand, and Portland cement as a binder. However, concrete obtained from such a mixture has disadvantages:

- low bending strength - 2.35 MPa;

- low compressive strength - 10.1 MPa;

- high water absorption - 13.3%.

An object of the invention is to develop a method for preparing a concrete mixture for the manufacture of a ballast pipe with a density exceeding 2800 kg / m ³ and having, after hardening and aging, a compressive strength of 50 MPa. This coating can significantly reduce the outer diameter of the ballast tubes.

The stated technical problem is solved in that the inventive method of preparing a concrete mixture for the manufacture of ballast pipes involves mixing sulfate-resistant Portland cement in an amount of from 12 wt.% To 17 wt.%, Water from 4 wt.% To 10 wt.%, Plasticizing additives based on polycarboxylate ether - from 0 , 1% to 0.25%. Barite ore is used as a filler. The content of fractions of barite ore in mass% is:

a coarse fraction with a grain size from Zmm to 25mm - from 7 to 18, a fine fraction with a grain size from 0.16mm to Zmm - from 70 to 85, a very fine fraction with a particle size from 0.01mm to 0.16mm - from 7 to 16.

At the same time, the water for mixing the concrete mixture undergoes preliminary preparation. Preliminary preparation consists in the fact that water is passed through a gap in which a magnetic field strength of between 120,000 A / m and 140,000 A / m is maintained. The water transmission rate is maintained in the range from 0.5 m / s to 3.0 m / s and the water treatment time is at least 2 hours.

For better injection of ballast material into the annular space between the outer surface of the pipe and the inner surface of the shell, the material may additionally contain an air suppressing additive - tributyl phosphate, in the following ratio of components in mass%:

sulfate-resistant Portland cement - from 12 to 17,

water - from 6 to 9.5,

plasticizer based on polycarboxylate ether - from 0.2 to 0.3,

tributyl phosphate - 0.0015,

indicated barite ore - the rest.

Also the stated technical problem is solved in that the device for preliminary preparation of mixing water for concrete mix includes a water storage tank with inlet and outlet nozzles and a mixing water treatment unit. The outlet pipe of the tank is connected to the input of the mixing water treatment unit. The mixing water treatment unit is made in the form of a hollow elongated element, inside of which a permanent magnet is installed to form a gap with the inner wall of the hollow elongated element. The gap is from Zmm to 5 mm. In this case, the permanent magnet has a magnetic field strength from 120,000 A / m to 140,000 A m. The output of the mixing water treatment unit is connected by the inlet of the tank, and the tank itself has an opening for draining the water.

In order to adjust the gap, the inner surface of the hollow elongated element and the outer surface of the permanent magnet are conical and parallel to each other. Wherein Permanent magnet mounted with the possibility of longitudinal movement.

The invention is further illustrated by a detailed description of a specific example of execution and drawings, in which:

figure 1 - shows a diagram of a device for the preliminary preparation of mixing water for concrete mixture;

figure 2 - shows an example of the installation of the magnet in the node water treatment.

The inventive device for the preliminary preparation of mixing water for concrete mixture, as shown in figure 1 and figure 2, contains a tank 1 for storing water. In the particular construction described, a vertically mounted tank with a capacity of 2 cubic meters is used as a reservoir 1. The volume of the tank is selected based on the volume of water needed to prepare the concrete mixture for applying one ballast pipe to the surface, i.e. one batch, and this volume is from 1, 2 to 1, 8 cubic meters of water.

An inlet 2 pipe is installed in the upper part of the tank 1, and an outlet 3 pipe is installed in the lower part of the tank 1. The inlet pipe has a valve 4 for switching the water supply. The outlet 3 pipe is connected by a hose 5 to the inlet of the circulation pump 6, and has a valve 7 for draining the prepared water. The output of the circulation pump 6 is connected by a hose 8 to the mixing water treatment unit 9.

Water Treatment Log 10 mixing assembly 9 is connected to the conical inner surface widening ^{^} N. Bnutri processing unit 9 of the mixing water is cone-shaped magnet 12, the axis of the internal conical expanding surface 11 of the water treatment unit 9 and the mixing of the magnet 12 coincide, and accordingly, the surface of the magnet 12 is parallel to the cone-shaped expanding inner surface 1 1 of the water treatment unit 9. The magnet 12 is mounted on the rod 13. In the described construction, the rod 13 is threaded and installed in a fixed nut 14. Thus, it is possible to move the magnet 12 in the direction of its axis, rotating the rod 13 in the nut 14, and change the gap 15 between the magnet 12 and conical expanding inner surface 11 of the node 8 of the water treatment, choosing the required size of the gap 15 for water treatment.

The output 16 of the water treatment unit 9 with a hose 17 is connected to the inlet pipe 2 of the tank 1.

The device operates as follows. Through the inlet

2 in the tank 1 pour the required amount of water. In this case, the valve

7 closed for draining the prepared water.

Set the required gap size 15. The gap 15 is in the range from 3 mm to 5 mm and is calculated based on the parameters of the water flow rate, volume and the required number of passes of a given volume of water through the water treatment unit 9. The circulation pump 7 is turned on and water is passed through the water treatment unit 9.

After a calculated period of time, but not less than 2 hours, the pump 7 is turned off.

Simultaneously with the preparation of mixing water, the process of mixing the components of the concrete mixture is carried out, for which barite ore is crushed to the dimensions specified in the recipe, for example, up to 10 mm. If necessary, barite ore is heated to a maximum of 5 ° C, especially watching the melting of sticky (frozen) pieces of rock to prevent stratification of the ballast mixture during transportation. Then measure the moisture content of barite ore. According to the moisture measurement results, the amount of barite ore in the composition of the ballast material is determined by the formula:

M (ow) = _M (cyx) / (1-W / 100), where M (vl) is the mass of barite ore taking into account humidity, m (dry) is the mass of barite ore in the nominal recipe,

W - humidity expressed as a percentage.

Barite ore is sifted through borate to isolate coarse impurities. Then, barite ore and sulfate-resistant Portland cement are fed through a conveyor system to the balance, where the components are weighed according to the specified composition.

For example, to conduct full-scale experiments, the results of which are shown in Table 1 and Table 2, the weight of the components was: sulfate-resistant Portland cement - 390 kg., Water that underwent preliminary magnetic preparation - 130 kg., Plasticizing additive based on polycarbonate ether - 8.15 kg , barite ore - 2730 kg., while at the exit the ball received 1 m of concrete with a density of 3260 kg / m.

The weighted components are fed into the mixer, for example, the XENTRIC X3000 planetary mixer with an output of up to 2 tons of finished product, where mixing takes place in 2 stages. At the first stage, initially barite ore of fine and very fine fractions, from 10% to 20% of coarse barite ore and cement, is poured into the mixer. Mixing in the first stage is carried out for approximately 10 to 14 seconds. Then the remaining large inert aggregate is poured into the mixer with constant stirring in equal portions. The time interval between loading a portion is from 10 to 15 seconds.

After mixing the components, open valve 7 to drain the prepared water into the concrete mixture. The water that has passed the preliminary preparation is supplied simultaneously with the supply of a plasticizing agent based on polycarboxylate ether, for example, Glenium 1 15. It is also possible to simultaneously supply an air suppressing additive, tributyl phosphate.

Stirring is continued until a homogeneous homogeneous mixture is obtained with a mobility of 5 to 12 along the cone of Stroy TsNIIIL.

The results of full-scale experiments shown in Table 1 and

Table 2 shows the advantages of the properties of the ballast material according to the invention.

The determination of the average density of the mixtures presented in Table 2 is made in accordance with GOST 12730.1-78.

The compressive strength of concrete was determined in accordance with GOST

10180-90.

Analysis of patent information showed that the proposed method for preparing concrete mixture for the manufacture of ballast pipes and a device for preliminary preparation of mixing water for concrete mixture is new. The inventive step is ensured, first of all, by the fact that the composition of the concrete mixture for the manufacture of ballast pipes was obtained as a result of many field experiments and does not follow explicitly from the level of development of ballast coatings.

Table 1

table 2

Received Number

1 2 3 4 5 indicators of the mixture

Density, kg / m ³ 3260 3020 3090 2970 2830

Strength (28

65 50 54 43 39.4 days), MPa

Claims

Claim

1. A method of preparing a concrete mixture for the manufacture of a ballast pipe, comprising mixing sulfate-resistant Portland cement, barite ore, plasticizing additives based on

5 polycarboxylate ether and water in the following ratio of components in mass%:

sulfate-resistant Portland cement - from 12% to 17%,

water - from 4% to 10%,

a plasticizer based on polycarboxylate ester - from 0.1% to 0.25%),

barite ore - the rest,

with the following content of barite ore fractions in mass%:

a large fraction with a grain size from Zmm to 25mm - from 7% to 18%, a small fraction with a grain size from 0.16mm to Zmm - from 70% to

15 85%

a very fine fraction with a particle size of from 0.01 mm to 0.16 mm - from 7% to 16%,

and water for mixing concrete mixture is pre-treated by passing through a gap in which 20 maintain a magnetic field strength of 120,000 A / m to 140,000 A / m, with a water transmission rate of 0.5 m / s to 3.0 m / s while the water treatment time is at least 2 hours.

2. A method of preparing a concrete mixture according to claim 1, characterized in that in concrete, the mixture is additionally introduced during mixing

25 tributyl phosphate in the following ratio of components in mass%:

sulfate-resistant Portland cement - from 12% to 17%,

water - from 6% to 9.5%,

plasticizer based on polycarboxylate ether - from 0.2% to 0.3%, tributyl phosphate - 0.0015%,

indicated barite ore - the rest.

3. A method of preparing a concrete mixture according to paragraphs. 1 or 2, characterized in that the ratio of the masses of very small fractions to large

5 fractions are in the range of 0.7-1, 0.

4. A method of preparing a concrete mixture according to paragraphs. 1 or 2, characterized in that the grain density of coarse and fine fractions of barite ore is in the range of 4300-4500 kg / m ³ .

5. A device for preliminary preparation of mixing water for mixing concrete, including a water storage tank with inlet and outlet nozzles, and a mixing water treatment unit, an outlet pipe of the tank connected to the input of the mixing water processing unit, made in the form of a hollow elongated element, inside which has a permanent magnet with a gap with the inner

15 by the wall of a hollow elongated element, the magnitude of which is from 3 mm to 5 mm, while the permanent magnet has a magnetic field of 120,000 A / m to 140,000 A / m, the outlet of the mixing water treatment unit is connected to the inlet of the reservoir, the reservoir has an opening for discharge of water.

20 6. The device according to claim 5, characterized in that the inner surface of the hollow elongated element and the surface of the permanent magnet are conical and parallel to each other, while the permanent magnet is mounted with the possibility of longitudinal movement.

25