Method of obtaining of cement mixing liquid

FIELD: construction.

SUBSTANCE: method comprises electrochemical treatment of mains water in three-chamber electrolysis unit with ion-selective membranes by alternating asymmetric current. Meanwhile the electrolysis unit anode is made from shungite. During the electrochemical treatment of water in the anode and in the anode chamber the ultrasonic oscillations are exited, the frequency of which exceeds the cavitation threshold frequency within a range from 20 kHz up to 100 kHz, and the intensity of the named ultrasonics is in the field of stable cavitation from 1.5 W/cm2 up to 2,5 W/cm2. Water treatment is stopped at achieving of density of particles of hydrated fullerene 10-3-10-4%.

EFFECT: improvement of frost resistance of concrete mix, increase of cement hydratation level and strength of cement stone in early periods of curing.

 

The invention relates to the construction materials industry, and in particular to methods of processing liquid mixing to prepare concrete mix, and is aimed at increasing the degree of hydration of cement and the strength of the cement stone.

A method of obtaining fluid was prepared by adding nanoparticles (nano modifiers), in particular fullerene with a particle size of from 20 to 200 nm, to achieve a concentration of fullerene in water 10-4-10-7% [1].

The disadvantage of this method is that obtaining nanoparticles of fullerene - the process is time-consuming and expensive. In the 90 years of the last century, when fullerenes only began to be used for practical purposes, the cost of fullerene was 10000$ per gram. The relatively rapid increase in the total number of units for production of fullerenes and constant work on improving methods of their purification resulted in a significant cost reduction With60for the last 17 years with 10000$ 10-15$ per gram {2}failed to turn their real industrial use. However, the price of fullerene, despite its marked decline in recent years, is still quite high. In addition, artificially produced nanoparticles of fullerene practically insoluble in water, which does not allow to increase their concentration in the liquid mixture, and this t is the train limits the potential of modified fluid. In the above-mentioned analog, there is a need to fill in each of the next portion of the fluid mixing a makeweight (dose) of fullerene particles, which complicates its implementation.

The known method of water treatment technology for preparation of concrete mix, when water before mixing with other components handle the constant electric current in electrolyzer the electrolyzer. The water treatment is carried out at an anode current density on the electrodes (0,1-2,0)102A/m2and the total area of the anode refers to the total area of the cathodes as 1:(1,0-2,5). In addition, before processing the regular electric shock, or after the water is further treated by the magnetic field strength (0,01-2,0)104A/m [3].

The disadvantages of the method are its complexity and the high energy consumption associated with complex processing liquid mixing constant electric current and magnetic field.

There is also known a method of cooking liquid mixing concrete mixture, which consists in the fact that water is injected hardness salts, after which the solution is subjected to hydro-mechanical interference with subsequent processing of the liquid in the cell an alternating electric current (U=30-60, i=from 0.01 to 0.025 A/cm2; f=50-200 Hz), after which the liquid is treated by the magnetic field 300-500 e [4].

The disadvantages of this is th method is its adaptability to manufacture, the complexity and high energy consumption associated with the implementation of the operations chemical, hydro-mechanical, electrochemical and magnetic effects on fluid mixing.

A method of obtaining concrete stone, including electrochemical processing fluid mixing in three-chamber electrolyzer DC. In the middle chamber of the electrolyzer serves 1-3% solution of calcium chloride, and in extreme camera - tap water. The electrochemical process is carried out when the rectified voltage 220 Century Cement shut a solution of the anode or cathode chamber. The increase in strength of the cement stone is up to 45% at the age of 1 day and up to 58% at the age of 28 days compared to the strength of cement stone, shut tap water [5].

The disadvantages of this method [5] should be attributed to the lack associated with use in electrochemical processing fluid mixing chemical component (1-3% solution l2and applying a relatively high voltage, which makes the use of this method is energy intensive and unsafe. In addition, increase the strength of cement stone, especially in the early stages of hardening, low and amounts to about 45%.

The closest in number of essential features and the achieved result is the way the floor is placed the liquid mixing cement, including electrochemical processing of tap water in a three-chamber electrolyzer with ion-selective membranes with subsequent use of the treated water for mixing cement for mixing cement use treated tap water taken from the average, or cathode, or anode chambers and electrochemical water treatment are variable asymmetric current at a voltage of 40-50, the frequency 500-600 Hz when the ratio of the amplitudes of the forward and reverse half-wave current to be 1.6-1.7 [6].

The disadvantage of the prototype method is that the liquid mixture is not structured, which reduces the processing properties of the concrete mix (low frost resistance of concrete mixture, flexibility, degree of cement hydration, Stripping time, and others), and the strength of concrete stone, obtained using the fluid mixing activated by the method prototype is relatively low.

The basis of the invention is improving the efficiency of the treated liquid mixing, the technical result is to increase the frost resistance of concrete mix degrees, increase the hydration of the cement and the strength of cement stone in the early stages of hardening.

The problem is solved as follows. According to the claimed method, the liquid mixing (tap water) about abayat in three-chamber electrolyzer with ion-selective membranes alternating asymmetric shock. While the anode of the cell are made of shungite and process for electrochemical treatment of water in the anode in the anode chamber excite ultrasonic oscillations whose frequency lies above the frequency of the cavitation threshold in the range from 20 kHz to 100 kHz, and the intensity of the above-mentioned ultrasound lies in the area of stable cavitation from 1.5 W/cm2up to 2.5 W/cm2, water treatment stopped when the concentration of particles of hydrated fullerene 10-3-10-4% used for mixing cement. For mixing cement take solutions from the cathode, medium or from an anode chamber of the electrolyzer.

Shared between the claimed method and the prototype in that the electrochemical processing fluid mixing is carried out in a three-chamber electrolyzer with ion-selective membranes alternating asymmetric shock, and as the fluid mixing take the water from the medium, the anode or cathode chambers of the cell.

The difference of the proposed method from the prototype is that the electrochemical processing fluid mixing is carried out in the electrolytic cell, the anode of which is made of shungite, and in the process for electrochemical treatment of water in the anode in the anode chamber excite ultrasonic oscillations whose frequency lies above the frequency of the cavitation threshold in the range from 20 kHz to 100 kHz, and the intensity of Yunosti mentioned ultrasound lies in the area of stable cavitation from 1.5 W/cm 2up to 2.5 W/cm2while water treatment stopped when the concentration of particles of hydrated fullerene 10-3-10-4%, after which the activated water is used for mixing cement. Additionally it should be noted that when implementing the proposed method does not require the introduction of chemical additives, which successfully replaces transferred from the anode into the water during its activation particles of hydrated fullerene.

The analysis allows to draw a conclusion about the presence of novelty and essential features of the claimed method.

Electrochemical processing of tap water asymmetrical alternating current in three-chamber electrolyzer with ion-selective membranes enhances the chemical activity of the liquid, that is, activates it. The zatvoreniem cement electrochemically activated water has an impact on the processes of dissolution, hydration, hydrolysis, which generally increases the strength of the cement stone, especially in the early stages of hardening. In the interelectrode space of the cell under the action of an asymmetric alternating current occurs orientation and directional movement of ions and water molecules to the electrodes, the conditions under which resonance effects occur in the electrical double layer (DPP) in the plane of the electrodes. Structural treason is Oia, started at interphase boundaries in death, due to the coherent motion of water molecules and hydrogen bonds, are distributed into the liquid phase, the alignment structures are formed, which when exposed to weak electromagnetic fields it is possible the spontaneous violation of their symmetry and further destruction. Significantly increases the active properties of the fluid mixing caught in the anolyte fullerene. In shungite contains not just fullerenes and hydrated fullerenes, able to be extracted by water. Thus, the change of the supramolecular structure of water significantly increases the chemical activity and, consequently, affects the process of structure formation of cement stone, which increases its strength. The unique properties of fullerenes is their ability to structure water. Fullerenes obtained by artificial means, are dissolved in water with great difficulty. But, if they are dissolved, as is the case in shungite around each ball is formed of a multilayer shell properly placed water molecules, about ten molecular layers. This water, in other words, hydrated shell of the Fullerene molecule is water.

It is known that in the electrolysis of water is the destruction of the anode and positive ions of the material (cations) are from the Academy of Sciences of the da through the anolyte and through the membrane comes in the cathode chamber.

In the present method as anode used shungite. The use of shungite as the anode allow its high electrical conductivity and other physical characteristics, the following:

- density - 2,25-2,40 g/cm3

the porosity of 0.5-5%

- compressive strength of 100-150 MPa

- modulus of elasticity (E) - 0,31×105MPa

- conductivity - (1-3)×103Cm/m

- thermal conductivity of 3.8 W/m·K.

- the average value of the coefficient of thermal expansion in the temperature range 20-600 - 12×10-61/deg.

In the present method uses the fact that in the process of electrolysis from the anode by the electric field burst positively charged ions (cations) of the anode material, which under the action of the field is moved in the near-cathode region, saturating the catholyte these cations.

It should be noted that the fullerenes obtained by artificial means, practically insoluble in water. Shungite is a stone of natural origin, and hydrated fullerenes, are included in it, is capable of dissolution in water.

In the inventive method, the process proceeds of positive ions from shungite anode intensify by using ultrasound.

By their physical nature ultrasound is an elastic wave, and in this he is no different from the sound.

It is considered that str is razvorovano range includes frequency, in the range from 20 kHz to 1 GHz. Frequency in the range from 16 kHz to 20 kHz, refer to audible sound.

Frequencies below 16 kHz, refer to infrasound, and frequencies above 1 GHz, called supersonic.

The frequency range of the ultrasound can be divided into three sub-regions:

ultrasound low frequency (2×104-105Hz) - ULF;

the mid-frequency ultrasound (105-107Hz) - USC;

ultrasound-high frequency (107-109Hz) - USVC.

In liquid medium under the action of ultrasound occurs and proceeds specific physical process of ultrasonic cavitation, providing maximum energy impact on shungite anode.

In an ultrasonic wave during the half-periods of depression occur cavitation bubbles, which abruptly shut after moving to an area of high pressure, giving rise to strong hydrodynamic disturbances in the water and in the pores of shungite anode, which significantly increases the effect of formation of cations from the anode material (shungite).

Cavitation is produced by the alternating waves of high and low pressure created by high-frequency sound (ultrasound).

Ultrasonic cavitation is the main initiator of physico-chemical processes occurring in the liquid under the action of ultrasound, cast the STI processes of formation of cations from the anode material.

Cavitation phenomena in a particular environment occur only when exceeding the ultrasound cavitation threshold.

The cavitation threshold is called the intensity of the ultrasound, below which are not observed cavitation. The cavitation threshold depends on the parameters characterizing both the ultrasound and the liquid.

For water and aqueous solutions cavitation thresholds increase with increasing frequency ultrasound and reducing the time of exposure.

At frequencies above 20 kHz the threshold unstable cavitation is in the range from 0.3 W/cm2up to 1 W/cm2.

Further increase in intensity of 1.5 W/cm2leads to the violation of the linearity of the oscillations of the walls of the bubbles. Stable cavitation stage begins. The range of intensities of stable cavitation lies in the area of 1.5 W/cm2up to 2.5 W/cm2. The bubble itself becomes a source of ultrasonic vibrations. On its surface waves occur, microcurrents, electrical discharges.

The increased intensity ultrasound for the value of 2.5 W/cm2leads again to the stage of unstable cavitation.

In the present method the most efficient use of the range of intensities of stable cavitation lies in the area of 1.5 W/cm2up to 2.5 W/cm2.

It is in this frequency range and capacity of ultrasound-activated water is, washing the surface of the anode and penetrating its pores, promotes intensive destruction of the anode material which enters the anolyte in the form of neutral particles and ions (cations) of hydrated fullerene.

Under the action of ultrasound-activated water is intensively mixed and through the pores penetrate shungite, which allows it to interact with the surface of shungite. Due to the ultrasound significantly increases the intensity of destruction of particles of shungite and receipts nanoparticles of fullerene contained in shungite in water, which greatly increases the efficiency of the activation process water.

Best hydration of particles of shungite occurs in the range of stable cavitation occurring at low frequencies. Therefore, to activate the fluid mixing concrete mixes best ultrasound low frequency. The choice of this frequency range due to the following factors.

First, the frequency of 20 kHz is taken as the lower boundary of occurrence of ultrasonic vibrations. At frequencies below 20 kHz is the area of the audible sound and the process of cavitation in this region are not observed.

Secondly, in the low frequency range lying between 20 kHz to 100 kHz, the range of intensities of ultrasound, in which there is a stable cavitation, as it was mentioned above, lies in the field of 1.5 W/cm2 up to 2.5 W/cm2.

The frequency range above 100 kHz, relates to the field of mid-frequency ultrasound. In this range of frequencies at a certain intensity ultrasound can produce the effect spouting jets activated liquid that may cause adverse effects in the preparation of concrete mixes. In addition, to ensure stable cavitation in the middle frequencies require more powerful irradiator than to create a named region in the low frequency range. This is due to the fact that the cavitation threshold increases with the frequency of the ultrasound. The necessity of a more powerful emitters in the midrange compared to the power of the emitters in the region of low frequencies results in a complicated and expensive design of the activator is water.

In the present method the most efficient use of the range of intensities of stable cavitation, which lies in the region from 1.5 W/cm2up to 2.5 W/cm2.

It is in this frequency range and capacity of ultrasound-activated water, washing the surface of shungite and penetrating its pores, promotes intensive destruction and fullerene nanoparticles released into the water in the form of neutral particles.

The concentration of particles of fullerene in water when exposed to shungite and water in the anode chamber Electrol is Zera ultrasound depends on the frequency, the ultrasound intensity and time of exposure to ultrasound on shungite anode and water in the anode chamber.

The experiments showed that the effect of ultrasound on water and shungite within 10-20 minutes leads to the achievement of nanoparticles of fullerene in water in the range of 10-3-10-4%, which is enough to give a liquid mixture (activated water) properties required for effective mixing of cement. These properties of fluid mixing, which becomes structured, increase the degree of hydration of the cement and the strength of the concrete stone, as well as to improve udoboukladyvaemosti concrete mixture, to reduce the water / cement ratio without compromising quality and technological properties of concrete mixes.

To form a judgment about how much water can fullerene structure, can from the following considerations. Since the diameter of the hydrated membrane is ten times the diameter of the carbon sphere, its volume, respectively, and a mass structured fullerene water will be proportional to the cube of the linear size and will exceed the mass of the fullerene about a thousand times. Thus, fullerene structures are thousands of times larger mass of water. In other words, what is already a hundredth of a percent of the fullerene able to structure a significant proportion of the solution. I.e. fullerene when the act is activate your product, fluid mixing effect in small and super small doses.

In its properties structured water surrounding the fullerene molecule, significantly different from normal. In particular, it does not freeze at 0, and when -2,8°C. This greatly increases the frost resistance of the concrete mix, enabling the concrete at lower temperatures without an additional heating of the concrete mixture.

Example. To prepare the cement used was Portland cement 300 M, as fluid mixing - activated water, prepared according to the method of the prior art and the claimed method. Electrolysis was performed three, running.

The middle chamber of the electrolytic cell is formed by ion-selective membranes MK-40 and MA-40. The cathode area of 30 cm2was made of stainless steel and in both cases (in the prototype and in the claimed method) remained the same. The anode in the electrolytic cell was changed. In water treatment by the method prototype he was made of compacted graphite, and by the present method from shungite. The process of electrochemical machining in both cases was performed on alternating asymmetrical current (S=l,6-1,7) at a voltage of 40-50, the frequency 500-600 Hz. The difference was that in water treatment by the present method in the anode in the anode chamber was opened ultrasonic vibrations, the frequency of which lay above the frequency threshold KAV is treated in the range from 20 kHz to 100 kHz, and the intensity of the above-mentioned ultrasound lay in the field of stable cavitation from 1.5 W/cm2up to 2.5 W/cm2. In this example, the ultrasound frequency was 20 kHz, and the intensity of the above-mentioned ultrasound lay in the field of stable cavitation and was equal to 2 W/cm2. As cavitation cage was used industrial sound processor "Hielscher Ultrasound Technology UP" brand UIP 1000 hd [7].

It was found experimentally that the treatment of the activated water for 10-20 minutes, the concentration of particles of hydrated fullerene was changed to 10-3-10-4% respectively. In this example, the water treatment led in both cases within 20 minutes. This duration of the process ensured that the concentration of fullerene particles in the fluid mixing will be 10-3-10-4%. After 20 minutes the water treatment was stopped, after which the activated water used for mixing cement.

The hydration of the cement was investigated by x-ray diffraction method for installing a DRON-4. Studies have shown that cement paste prepared according to the method prototype, the hydration of the cement was 70%, whereas by the present method it was equal to 86%.

The obtained solutions kneaded cement (W/C:=0,27) and formed cubes of size 3×3×3 cm, which was verdeli the natural wet conditions. In time (7-28 days) the samples are tested for strength in compression. The compressive strength of the cement stone, shut the liquid mixture is prepared according to the method prototype, was at the age of 7 and 28 days on average, respectively 242 and 427 kg/cm2while the compressive strength of the cement stone, shut the liquid mixture is prepared by the present method, amounted at the age of 7 and 28 days on average, respectively 272 and 513 kg/cm3.

Thus, the inventive method compared with the method of the prototype allows to increase the degree of hydration of the cement 1.23 times, and the strength of cement stone in compression 1.12 and 1.2 times at the age of 7 and 28 days, respectively. An additional advantage of the liquid mixture is prepared by the present method before the prototype is that it does not freeze at 0, and when -2,8°C. This greatly increases the frost resistance of the concrete mix, enabling the concrete at lower temperatures without an additional heating of the concrete mixture.

Sources of information

1. Paharenko Y. C., Nikitin, C. A., Letenko D., Nanostrukturirovanie of the mixing water as a way to increase the efficiency of the plasticizer concrete mixtures// Building materials. - Science, No. 8 (Annex to scientific and technical journal" under the tion materials", 2006.-that is, 154-161.

2. Vul A. J. electronic Materials technology, No. 3, S. 4 (1999).

3. The patent of Russian Federation N 2017702, M. KL SV 40/00, bull. No. 15, 15.08.94.

4. Patent USSR No. 1782230, M. CL. SW 40/00, bull. N 46, 15.12.92.

5. Auth.St. No. 1705266, M. KL SV 40/00, bull. No. 2, 15.01.92.

6. RF patent №2163582. A method of obtaining a fluid mixing cement Semenov, D.; Sarkisov Y. C.; Eremin, A. N.; Semenov, C. D.; Samples of SV. /Published: 2001.02.27. Bull. # 6 (Prototype).

7. Inquiry from http://www.hielscher.com.

A method of obtaining a fluid mixing cement, including electrochemical processing of tap water in a three-chamber electrolyzer with ion-selective membranes asymmetric alternating current with the subsequent use of the treated water taken from the anode chamber, medium or cathode chambers for mixing cement, characterized in that the anode of the cell are made of shungite and process for electrochemical treatment of water in the anode in the anode chamber excite ultrasonic oscillations whose frequency lies above the frequency of the cavitation threshold in the range from 20 kHz to 100 kHz, and the intensity of the above-mentioned ultrasound lies in the area of stable cavitation from 1.5 W/cm2up to 2.5 W/cm2, water treatment stopped when the concentration of particles of hydrated fullerene 10-3-10-4%, after which the activated water is used for zatvoreni the cement.



 

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1 ex, 1 tbl

FIELD: construction.

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2 tbl

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FIELD: manufacture of building materials.

SUBSTANCE: quick-hardening bound cement mortar including, vol parts: cement 6-9, water 2-3, aqueous epoxide resin dispersion 1, and hardener 1, said cement being of quick-hardening type and said dispersion additionally containing polyurethane rubber. Quick-hardening cement can be alumina-based cement. In a method of preparing quick-hardening bound cement mortar including mixing cement with aqueous epoxide resin dispersion and hardener on a surface immediately before underwater application, one volume part of water is diluted with one volume part of hardener and stirred, after which one volume part of aqueous dispersion of epoxide resin and polyurethane rubber are added, resulting mixture is agitated and then, depending on particular application, 1 or 2 vol volumes of water are added and, after agitation, resulting composition is used to temper quick-hardening cement, and stirred in low-speed mixer until soft plasticine-type plastic homogenous mass is obtained, after which mortar is held up to 5 min and agitated once more. Escort method of repairing concrete and reinforced concrete underwater structures comprises conveying quick-hardening cement mortar into underwater repair operation zone and manually laying thus prepared mortar onto prepared surface with defective spots. Conveyance of mortar can be accomplished by means of containers or buckets, or yet by means of worm mortar pumps. Invention enables preparation of repair material characterized by dimensional stability, short setting time and fast hardness development, non-diffuseness in aqueous media, waterproofness, frost resistance, crack resistance, resistance to corrosive media (salt and alkali solutions, petroleum products), high adhesion to cement, concrete, and metallic surfaces, and not leading to corrosion of hardware.

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6 cl

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EFFECT: simplified technology of no-fines concrete; concrete of improved quality.

3 ex, 1 tbl

FIELD: manufacture of building materials.

SUBSTANCE: method consists in preliminarily affecting only tempering water directly in supply tank of concrete-mixing unit by means of high-voltage electric discharges emerging in interelectrode spaces of electrode system followed by adding chemical additives before mixing tempering water with binder and fillers, all operations being accompanied with active agitation of with mechanical agitator driven from electric motor.

EFFECT: considerably shortened total mixing time, improved quality of mix because of more evenly distributed activated water molecules and chemical additives, and reduced consumption of power on activation of water.

1 dwg

FIELD: manufacture of building materials.

SUBSTANCE: method consists in preliminarily affecting only tempering water directly in supply tank of concrete-mixing unit by means of high-voltage electric discharges emerging in interelectrode spaces of electrode system followed by adding chemical additives before mixing tempering water with binder and fillers, all operations being accompanied with active agitation by means of air bubbles bubbling through water, e.g. from gas collector with nozzles supplied with air from compressor.

EFFECT: considerably shortened mixing time, improved quality of mix, and reduced consumption of power on activation of water.

1 dwg

FIELD: manufacture of large-size cement-fiber plates used for facing buildings and making roof covering.

SUBSTANCE: method comprises steps of mixing cement, sand, micro-filler, reinforcing synthetic fibers, plasticizing additive and water; shaping and drying; using wollastonite as micro-filler. At first in turbulence mixer dry loose components such as cement, sand, wollastonite are mixed. Then reinforcing synthetic fibers are added and composition is mixed. Plasticizing additive and water are added at next relation of ingredients, mass.%: cement, 68 -81; sand, 9.5 -13.5; wollastonite, 9.25 - 12.50; synthetic reinforcing fibers, 0.16 -0.55; plasticizing additive, 0.38 -0.43; water, the balance. Articles are dried in air in natural condition. Polypropylene fibers are used as synthetic reinforcing fibers. Mixing of cement, sand and wollastonite in turbulence type mixer is realized during time period no more than 30 s at using water heated up to temperature no lower than 40°C. Size particle of wollastonite is in range 100 -170 micrometers.

EFFECT: enhanced quality of plates.

5 cl, 1 ex, 1 tbl

FIELD: building materials, particularly for forming heat insulated and structural heat insulated articles, for forming cast-in-place heat- and noise-insulation floor panel filling of cellular concrete.

SUBSTANCE: method involves preparing cellular concrete mix; pouring the mix into mold or formwork; applying additive on cellular concrete mix surface; treating the surface layer with device having rotary disc provided with needles variable in length and heat treating the concrete mix. Cellular concrete mix is prepared with the use of composite gas-foam pore former in tubular mixing means during cellular concrete mix heating up to 45-65°C. Additive is applied on convex concrete surface just after cellular concrete mix heaving. Fibrous agent and/or water-soluble component taken in amount of 2-8% of the cellular concrete mix weight is used as the additive. The surface layer has 2 cm thickness. Disc comprises needles gradually decreasing in length from disc center to periphery thereof. Fibrous agent is asbestos, wool, rock wool and polymeric fiber waste. Water-soluble polymer is polyvinyl acetate, polyvinylchloride, polysterene or polyacryl.

EFFECT: improved service characteristics of the ready article, reduced time of production due to optimal combination of above mix preparing and mechanical surface treatment operations.

3 cl, 1 tbl

FIELD: construction.

SUBSTANCE: method comprises supplying water and cement or water, cement, and sand to the cavitation mixer, mixing the ingredients in the presence of an activator during 5-15 min, introducing the dry blowing mixture to the solution produced, and further mixing during 15-60 s. The dry blowing mixture is composed of, in mass %, 70 of cement, 12 of pigment aluminum powder, 12 of water-soluble aluminum powder, 2 of antifreeze plasticizer, and 4 of water.

EFFECT: reduced cost and enhanced efficiency.

4 tbl

FIELD: manufacture of building materials.

SUBSTANCE: invention relates to manufacture of polystyrene-concrete parts for use in construction as wall and heat-insulating material. Manufacture of heat-insulation products comprises preparation of molding mix from Portland cement (60.0-65.6%), water, and granulated foamed polystyrene with loose density 10-20 kg/m3 (2.2-4.4%), molding, and heat treatment of products. Invention resides in that molding mix additionally includes microsilica (6.6-12.0%) and superplasticizer S-3 (0.6-0.66), starting mix Portland cement/microsilica/foamed polystyrene is first stirred for 2-3 min, then water containing superplasticizer is added, resulting mix is stirred for further 3-5 min and loaded into molding boxes. Molding involves vibrocompaction and pressing followed by unloading of products from molding boxes and heat treatment: 2 h at 15-25°C, 8 h at 40-60°C, and 1 h at 15-30°C.

EFFECT: reduced consumption of cement, improved placeability and moldability of mix, increased strength of products, and increased productivity.

2 tbl

FIELD: construction industry.

SUBSTANCE: the invention is pertaining to the field of construction industry, in particular, to the production of glass containers, in particular, to the methods of production of an items out of a concrete mix, which may be used in municipal landscape improvement of overall decor accomplishment of the modern town-planning in the form of the decorative fencing, lawns, roads, gardens in front of buildings, flower beds, at paving of territories and in other cases of the landscape design. The technical result is production of the items with a high strength, life duration, frost-resistance, increased chemical durability, watertightness, cement saving due to substitution of its optimum amount for microsilica. The method of production of an item our of a concrete mixture provides for preparation of concrete mixture by stirring of cement, sand, an pigment of organic or inorganic generation, C-3 superplasticizer and water with the subsequent laying of the concrete mixture in the form with an relief insert, placing the form on a molding table, compaction by vibration. At that they use sand with the grade modulus of Mgr-2.4-3.2. The concrete mixture is added with microsilica, and components take in the following ratio (in mass %): cement - 19.5-22.0, the indicated sand - 69.0-69.2, the indicated pigment - 0.7-1.0, C-3 superplasticizer - 0.1-0.21, microsilica - 1.0 3.4, water - the rest. At that first they stir the indicated sand and the indicated pigment for 45-50 seconds, then this mixture is added with the cement and microsilica and again the mixture is stirred during 60-70 seconds, then it is added with water with C-3 superplasticizer and the mixture is stirred for 120- 180 seconds, and compaction by vibration is carried out for 1-2 seconds with the subsequent simultaneous compaction by vibrations and pressure of 10-15 atm during 6-15 seconds. After that the newly formed item is placed in the chamber of the hygrothermal treatment with the temperature 0f 17-23°C and the relative humidity of 90-100 % and keep there for 15-20 hours. At that the form is made out of a steel and the figure inserts are made out of polyurethane.

EFFECT: the invention ensures production of the items with a high strength, life duration, frost-resistance, increased chemical durability, watertightness, cement saving due to substitution of its optimum amount for microsilica.

2 cl, 3 tbl, 1 ex

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