Dry concrete or mortar composition, containing porous granules

FIELD: chemistry.

SUBSTANCE: group of inventions relates to dry concrete or mortar composition, containing porous granules and to concrete or mortar, manufactured from said composition. Dry concrete or mortar composition, containing particles-cores, to the surfaces of which particle of hydraulic binding substance are fixed, and separate particles of hydraulic binding substance, particles-cores consist of inert or pozzolanic material and together with binding substance attached to them form porous granules, which, in their turn, are fixed to the surface of dry filling agent. Concrete or mortar, manufactured from said dry composition, mixed with water, is described. Invention is developed in dependent items of the invention formula.

EFFECT: increase of strength and fire resistance of concrete, obtained from claimed dry composition.

25 cl, 2 ex

 

The present invention relates to a dry composition of the concrete or mortar containing granules, and the concrete or mortar made from such a composition.

Raw materials, manufacturing technology and logistics concrete involves many uncertainties adjusted by means of the so-called safety factor. In addition, important uncertainties associated with the strength of materials, which mainly are the result of external factors. All this requires an increase in concrete structures concrete and quantity of steel.

Usually used a method of manufacturing a so-called ready mix is the transportation of raw materials in a separate mixing plant and further transportation of concrete mix to the place of its application. The problems with loose concrete structure and the associated heterogeneity. Logistics adds uncertainty related to the homogeneity of the concrete.

The present invention is the reduction of uncertainties and variations of quality associated with the manufacture of concrete.

In particular, the present invention is the production of a dry mix suitable for making concrete or mortar, which contains different is e dry materials in the proper proportions relative to each other and attached to each other, which can easily be mixed with water into a homogeneous mass.

Thus, the present invention relates to a dry composition of the concrete or mortar sweep containing porous particles forming the core, the surface of which is attached particles of the hydraulic binder, the individual particles of the hydraulic binder and the dry filler, the surface of which is attached to other components of the concrete or mortar.

More specifically, the composition in accordance with the present invention has the characteristics set forth in paragraph 1 of the attached claims.

Concrete or mortar in accordance with the invention has the characteristics set out in paragraph 14 of the attached claims.

The advantage of the present invention is that the dry composition may be delivered directly to the place of casting using conventional container handling equipment and it does not harden prematurely, for example, during transportation. Porous granules in accordance with the present invention are capable of binding water, resulting in water required for curing of concrete, concrete product receives using the same pellets. The method in accordance with the present invention also reduces the safety factor. At the same time the applicability of the obtained concrete aspromising structures improved. In addition, the use of porous granules in accordance with the present invention minimizes the need for hydraulic binder substance per cubic meter of concrete. Also due to the reduction of manufacturing time of increased profitability.

These advantages allow to obtain the production of concrete of the components in the correct proportions relative to each other.

Thus, the present invention relates to a dry composition suitable for the manufacture of concrete or mortar mixtures containing porous particles forming the core, the surface of which is attached particles of the hydraulic binder, and the individual particles of the hydraulic binder, the particles-nuclei consist of inert or pozzolanic material and form porous granules with attached binder; granules, in turn, attached to the surface of the dry aggregate.

In accordance with one of preferred embodiments of the present invention to enhance the attachment of the particles to each other binder used, preferably consisting of nanoparticles of calcium carbonate or polymer particles, and preferably a mixture of the particles of the carrier and the polymer particles.

In accordance with one particularly preferred options domestic is the invention of the dry composition, in accordance with the invention contains particles of dry filler, on surfaces which are nanoparticles of calcium carbonate (caso3), and granules, and granules, in turn, contain inert or pozzolanic particles-core, covered with a hydraulic binder and bonded to the particles of the dry aggregate (and hydraulic wagamama substance) by means of the binder.

Granules

The granules are porous spherical particles formed from inert or pozzolanic material, preferably of metakaolin, more preferably in the form metakaolin particles (MK). Small particles of hydraulic binder, the characteristic size less than 3 μm, attached to the outer surfaces metakaolin particles. If necessary, these particles hydraulic binder can be processed in such a way as to obtain a steeper size distribution.

In accordance with one of preferred embodiments of the invention are inert or pozzolanic material is pozzolanic the metakaolin formed by agglomeration of kaolin and subsequent calcination at least outer surfaces formed so agglomerates, and which most preferably has the form of a porous spherical particles metakaolinite slag (MKS) (from the English. "MetaKaolin Sinter"). The size of these frequent the C MKS is preferably from 10 to 100 μm, however, the main part has a size of approximately from 20 to 60 μm. Small particles of hydraulic binder size less than 5 microns, but mostly less than 3 μm, essentially, less than 2 μm, attached to the surface MKS using condensed water or a binder. At the stage of formation of CA(Oh)2and gaseous filler CO2remain in the porous structure of the particles.

At the stage of manufacture of calcium oxide (CaO) and, possibly, the sodium oxide (Na20), and gas, the most suitable of which is carbon dioxide, helium or air, or a mixture thereof, remain in the pores of porous granules.

In the manufacture of nanoparticles of calcium carbonate remains in the porous structure of the MKS, and by calcining these nanoparticles partially decompose to calcium oxide (Cao) and carbon dioxide (CO2). Thus, the porous structure preferably contains from 2% to 20% of calcium oxide (Cao) from the total mass of granules, more preferably from 8 to 15%. Accordingly, the porous structure preferably contains from 0.5 to 5% sodium oxide (Na2on the total weight of the granules, more preferably from 1% to 2%, which is similarly formed from sodium hydroxide (NaOH).

CaO forms with water, calcium hydroxide (CA(Oh)2), which then enters into the pozzolanic reaction of metakaolin. By using CA(Oh)2about the broken off by MKS, and CA(Oh)2formed of Portland cement, get pozzolanic reaction in accordance with the purpose and need for this purpose the number. This can be used, for example, to increase the initial strength. The sodium oxide (Na2O), in turn, improves the fire resistance of the composition.

In the manufacture of MKS in its porous structure formed by CO2reacts with CA(Oh)2in the manufacture of concrete. In the reaction are formed nanoparticles of caso3in the future act as nucleation centers.

To influence the plasticity of the mixture formed by means of a hydraulic binder, mixing and casting of the concrete used method, which can be applied hydraulic binder containing a greater number of small particles. This can be used to influence initial strength. Particles of the hydraulic binder is larger than 3 μm remain free, and their number is relatively particles MKS practically does not change; therefore, a random distribution in the same space is 50%. Particles MKS also bind water in the composition, hence the moisture is distributed in the composition is more evenly than in the known compositions, and preferably longer remains in the composition and in the resulting and is it concrete or mortar.

The relationship between these two groups of particles (MKS and hydraulic binder) is stable, then when they are attached to the particles of the dry aggregate.

Dry placeholder

The dry filler used in accordance with the invention, is preferably limestone, some other stone, silicon dioxide, synthetic dry filler or mixtures thereof, the most suitable is limestone, and the size of its particles is preferably not more than 16 mm, more preferably from 0.1 to 16 mm, most preferably from 0.3 to 6 mm above granules and large particles (>3 μm) hydraulic binder attached to the surface of the particles of the dry filler using a binder. Thus, get the dough, or mortar, suitable for the manufacture of concrete.

Binder

Binder in the dry composition preferably contains the following:

1. media

2. polymers attached to the media.

The carrier preferably contains nanoparticles of calcium carbonate (caso3), the size of which is preferably from 50 to 1000 nm, most preferably from 100 to 200 nm. They function, for example, sources of growth (~220000 m2/m3concrete) surface rupture and crystallization centers in the hydraulic binder to the me. They contain from 1% to 15%, most preferably 10%, commonly used metallic impurities.

Polymers, in turn, are preferably copolymers, basic polymers which are polyvalent linear carboxylic acids, which, due to its net positive charge, are able to attach to carbonates.

In accordance with one of preferred embodiments of the invention the composite particles formed from this combination, and polymer bridges are accumulated around the nanoparticles. The composite particles have a coverage area (i.e., the diameter of the nanoparticles coated with the polymer) constituting from about 100 nm to about 1000 nm, preferably from about 200 nm to about 400 nm, most preferably about 200 nm. These composite particles to form a dry adhesive film between the particles of the dry composition, to be attached to each other, or between the pellet and particle.

Hydraulic binder

The hydraulic binder is preferably Portland cement (OPC). "Ordinary Portland Cement") or cement with a particularly high content of C2S (dicalcium silicate), most preferably Portland cement. As already mentioned, the particles of the hydraulic who agudelo substances, if necessary, may be thus treated, to get steeper size distribution. Usually Portland cement has a very low distribution of particle size, and it provides acceptable workability of conventional concrete.

Steeper distribution of particle size and consequently improving the form factor is obtained by processing of Portland cement squeeze rolls, which are crushed part of the large particles of cement. This improves the form factor of the particles and increases the number of small particles by 10-15%.

The method in accordance with the present invention allows the use of larger particle size <3 μm, than the well-known technology, without increasing the amount of water.

The copolymer

In accordance with one of preferred embodiments of the present invention, in addition to the aforementioned bonding, to increase coverage of the various particles of the granules applied to the polymer. These polymers also function as plasticizers and controls the movement of water in the solutions.

Applied polymers are preferably copolymers, the molecular form of the base polymer which is a linear polyvalent carboxylic acid. The molecular weight of the basic polymer is preferably from 2000 to 4000 g/mol, more preferably about 4000 g/mol, and the degree of polymerise the AI equal to 55. Most preferably the base polymer is an acrylic acid.

For the formation of copolymers in addition to the base polymer is preferably used polyethylene glycol and maleic acid as monomers. If as the base polymer used acrylic acid, thus, receive the esters of polyacrylic acids and crosslinked acid. Consider monomers and structures are:

Acrylic acid, H2C=CH·COOH

The polyethylene glycol of NON2·(H2S·O·CH2)n·CH2HE

Maleic acid, noos·NS=CH·COOH

Thus obtained cured product is acid. Its pH ranges from 1.7 to 2.5. However, for the application of the product is neutralized, preferably using 20% NaOH to bring the pH to 6.

When using emulsion polymerization get a lot of different polymers. Studies using high-performance liquid chromatography HPLC can be found polietilenglikolsuktsinata, polietilenglikolya and crown ethers and unreacted monomers of different sizes.

Darkening suggests that the mixture still contains unreacted double bonds in polymers and monomers.

Attaching copolymers of acrylic acid to the mineral particles, the implementation of which is then when anionic carboxylate polyacrylate positive effect on group minerals, resulting insoluble soap. On average polymer chain contains one anionic group per linked monomer, which may mean that in the range of one nanometer base polymer contains approximately ten anionic carboxylate groups, ready to attach to the surface of any particle of the dry composition. Most simply attaching is performed to the crystalline calcium carbonate of calcium and iron, present as impurities, to metakaolinite slag and aluminum hydraulic binder. Soluble ions of calcium, iron and aluminum also precipitated polyacrylate in the form insoluble Soaps, giving a lubricating effect.

After drying, the copolymers suitable for the present invention, to form a continuous film, soluble in water, if the drying temperature below 100°C., preferably about 50°C, and the film is not soluble in water, if the drying temperature above 100°C, preferably about 110°C.

When combining the polymer with a carrier (calcium carbonate) receive multiple benefits. The combination acts as a plasticizer, a regulator of water movement and water-soluble adhesive film.

By itself, the polymer is a combination, where the base for the emer specifies the length of the copolymer, and other monomers complement different coverage area of the base polymer. The media, in turn, increases the area of coverage of polymers and acts as an independent improver hydrate binder.

The final product

The dry composition in accordance with the present invention contains all the dry ingredients needed to produce well-mixed concrete or mortar, resulting in the simple addition of water and mixing of the composition usually turns the song into a homogeneous solid concrete or mortar, with minimized number of defects (such as cracks and discontinuities). Thus, the number of production stages is also minimized when the product is completely manufactured at the factory, where it is also possible mainly keeping.

The dry composition preferably contains particles of dry aggregate on surfaces which are nanoparticles of calcium carbonate (caso3), hydraulic binder and granules; granules, in turn, may contain a binder and an inert or pozzolanic particles-core, covered with a hydraulic binder, and the granules are bonded to the particles of the filler (and a hydraulic binder) using a binder.

EXAMPLES

Example 1 - Application of the mixture of copolymer and media

The use of a copolymer based on acrylic acid together with a carrier as a plasticizer was successfully tested by mixing in aqueous suspensions of 20%, 92.5 wt.% nanoparticles of calcium carbonate and 7.5 wt.% the polymer mixture. The plasticization of concrete was adequate with a small dosage, 800 g / m3concrete.

Tests also were performed on plasticizer, dried at low temperature (t=50°C), resulting in a plasticizing effect on the concrete was sufficiently effective after re-dissolution. This temperature is not suitable for further polymerization reactions in the mixture, the resulting mixture retains solubility in water.

Thus obtained mixture of the polymer and caso3were subjected to tests on bonding by heating in an oven at 110°C. After evaporation of water was formed dense water-insoluble film, effectively bonding the particles. The film was absolutely transparent, due to the fact that under the action of heating the unsaturated components of the polymer mixture is reacted with each other and had the final reaction cross-linkage of the linear base polymer molecule are larger in size.

The mixture of the polymer and the media (in particular, solubility in water) was investigated using two of the following tests:

Test 1.

Caso3

Test 2.

Caso3+the copolymer was dried to form a film so that the temperature of the combination exceeded 110°C. the Film was not dissolved in the water.

Example 2 - Production of dry composition

Test dry compositions were prepared as follows:

1. Washed dry aggregate;

2. Added caso3+copolymer, 30%;

3. Was added to the granules in the form of dry powder, and

4. Was carried out by drying in liquid form, so that the product temperature does not exceed 50°C.

The dry composition was a mix up in the concrete for concrete testing, and used the ratio between the components, as in the following experimental compositions. Measured compressive strength (after 6 hours at 50°C, with the sample-cylinder diameter 9 of 70 mm and height h=70 mm) and distribution (table Hagelman (Hagelman)).

Were prepared experimental compositions (Trials 1-4), applied to the number given as example. However, it was found that the ratios of the ingredients used in these experimental compositions, especially work well in choosing the accordance with the present invention.

Test 1

On m3concrete
Dry aggregate (DA - "dry aggregate")1980 kg
Pellet
ISS60 kg
LFS<2 μm50 kg
LFS>2 μm200 kg→310 kg
Caso3+copolymer11 kg
Total2301 kg

When testing concrete measured compressive strength of this composition was 30 MPa and flow rate of 180 mm

Test 2

On m3concrete
1. Pellet
ISS60 kg
LFS<2 μm50 kg
LFS>2 μm200 kg
310 kg
2. Dough
Pellet310 kg
Caso3+copolymer11 kg

Water:
w/c of 0.4and100 kg
The pozzolanb10 kg
Absorption waterwith60 kg→170 kg
491 kg

a: w/c of 0.4 is hydrated with water to the hydraulic binder, and applied the designation refers to the w/c ratio (=ratio of the water-binding agent), the specified value is about 0.4.

b. Pozzolanic water is water necessary for the implementation of pozzolanic reaction.

c. Absorption water in its PTS who lived, necessary for the absorption of water

ISS.

When testing concrete measured compressive strength of this composition was 26 MPa, and spreading 152 mm

Test 3

Were prepared agglomerated, whether ISS+Cao and/or Na2O:

1. The spray dryer were placed the following suspensions:

1. Kaolin1000 kg2.Kaolin1000 kg
Caso3n100 kgCaso3n20 kg
The copolymer20 kgThe copolymer2 kg
Water1100 kgNaOH20 kg
Water1000 kg

The obtained intermediate products were kaolin agglomerates ranging in size from 10 to 100 microns (20 to 40 μm).

2. The calcination:

Intermediate products are subjected to heat treatment in a liquid (at 1000°C), the result is e which were obtained solid waste (metakaolin, % (MC, %) from 20 to 40).

Product 1Product 2
ISS~1000 kgISS~1000 kg
MK~200-400 kgMK~20 kg
CaO~50 kgNa20~16 kg

Products 1 and 2 are shown as examples. For example, the number of caso3and NaOH, if necessary, may vary.

Test 4.

Were prepared products containing copolymer in accordance with the present invention:

1. Caso3ndiameter 9 from 100 to 300 nm (Fe 10%)

2. The molecular weight of the copolymer is 400, degree of polymerization equal to 55.

Was found to increase the field strength of the repulsion of the polymer at ~50 nm outward from the particle surface.

1. The dry composition of the concrete or mortar containing particles of the nucleus, to the surfaces which are attached to the particles of the hydraulic binder, and the individual particles of the hydraulic binder, the balance of audacia fact, what particles-nuclei consist of inert or pozzolanic material and together with attached binder to form a porous granules, which, in turn, attached to the surface of the dry aggregate.

2. The composition according to p. 1, wherein the particle core containing metakaolin.

3. The composition according to p. 1, characterized in that the dry aggregate is limestone or other stone, or synthetic filler, or mixtures thereof, and the particle size of the filler is preferably from 0.1 to 16 mm, more preferably from 0.3 to 6 mm

4. The composition according to p. 1, characterized in that the porous structure of the granules contains calcium oxide (CaO), remaining in the manufacture, in an amount of from 2 to 20% by weight of the total granule, preferably from 8 to 15%.

5. The composition according to p. 2, characterized in that the porous structure of the granules contains calcium oxide (CaO), remaining in the manufacture, in an amount of from 2 to 20% by weight of the total granule, preferably from 8 to 15%.

6. The composition according to p. 3, characterized in that the porous structure of the granules contains calcium oxide (Cao), remaining in the manufacture, in an amount of from 2 to 20% by weight of the total granule, preferably from 8 to 15%.

7. The composition according to p. 1, characterized in that the porous structure of the granules contains sodium oxide (Na2O), remaining in the manufacture, from 05% to 5%, preferably from 1% to 2%.

8. The composition according to p. 2, characterized in that the porous structure of the granules contains sodium oxide (Na2O), remaining in the manufacture, in an amount of from 0.5% to 5%, preferably from 1% to 2%.

9. The composition according to p. 3, characterized in that the porous structure of the granules contains sodium oxide (Na2O), remaining in the manufacture, in an amount of from 0.5% to 5%, preferably from 1% to 2%.

10. The composition according to p. 4, characterized in that the porous structure of the granules contains sodium oxide (Na2O), remaining in the manufacture, in an amount of from 0.5% to 5%, preferably from 1% to 2%.

11. The composition according to p. 5, characterized in that the porous structure of the granules contains sodium oxide (Na2O), remaining in the manufacture, in an amount of from 0.5% to 5%, preferably from 1% to 2%.

12. The composition according to p. 6, characterized in that the porous structure of the granules contains sodium oxide (Na2O), remaining in the manufacture, in an amount of from 0.5% to 5%, preferably from 1% to 2%.

13. The composition according to p. 1, characterized in that the particles of the hydraulic binder is attached to the particle cores using a film formed by the copolymer.

14. The composition according to p. 1, characterized in that the granules are attached to the surface of the dry filler using a film formed by the copolymer.

15. The composition according to p. 13 or 14, characterized in that the copolymer is formed from a base polymer, which is a linear polyvalent polycarboxylic acid, the molecular weight is preferably from 2,000 to 4,000 g/mol, most preferably about 4000 g/mol, and its degree of polymerization is equal to 55.

16. The composition according to p. 13 or 14, characterized in that the copolymer is formed using polyethylene glycol and polymerized maleic acid.

17. The composition according to p. 15, characterized in that the copolymer is formed using polyethylene glycol and polymerized maleic acid.

18. The composition according to p. 13 or 14, characterized in that the drying process, the copolymers form a film, soluble in water, if the drying temperature below 100°C, preferably about 50°C.

19. The composition according to p. 17, characterized in that the drying process, the copolymers form a film, soluble in water, if the drying temperature below 100°C, preferably about 50°C.

20. The composition according to p. 13, 14, 17 or 19, characterized in that the drying process, the copolymers form a film, not soluble in water, if the drying temperature above 100°C, preferably about 110°C.

21. The composition according to p. 15, characterized in that the drying process, the copolymers form a film, not soluble in water, if the drying temperature above 100°C, preferably about 110°C.

22. The composition according to p. 16, characterized in that the process suck the copolymers form a film, not soluble in water, if the drying temperature above 100°C, preferably about 110°C.

23. The composition according to p. 13 or 14, characterized in that the copolymer is used together with a carrier, which is calcium carbonate (CaCO3), with a particle size of, preferably comprising from 50 to 1000 nm.

24. The composition according to p. 23, characterized in that the carrier CaCO3contains from 1% to 15%, preferably 10%, of metallic impurities.

25. Concrete or mortar, characterized in that it contains a dry composition according to any one of the preceding paragraphs, mixed with water.



 

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FIELD: chemistry.

SUBSTANCE: invention relates to a powdered composition of a construction material, preferably dry mortar for industrial production, and especially to tile adhesives, joint filler, putty, waterproofing slurry, repair mortar, levelling mortar, reinforcing adhesives, adhesives for heat-insulation composite systems, mineral plaster, fine putty and seamless floor systems, which contains an ester of A) 2-ethylhexanoic acid and B) an alcohol with a boiling point of at least 160°C. Further, the invention discloses the production of said products, as well as use of esters according to the invention in powdered compositions of construction materials for reducing dust formation. The invention is developed in subclaims.

EFFECT: reducing dust formation, reducing the degree of release of organic compounds during storage and use of construction materials.

14 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: claimed invention relates to a concrete-expanding additive and to a method of obtaining thereof. Concrete with the said additive possesses higher stability in storage. The concrete-expanding additive is obtained by thermal treatment of a clinker or a powder-like clinker, which contains in wt.p. per 100 parts of the clinker free lime in an amount of 10-70, a hydraulic substance 10-50 and water-free calcium sulphate 1-50, in an atmosphere of gaseous carbon dioxide to form in it calcium carbonate. In the method of obtaining an expanding additive clinker, containing free lime, the hydraulic substance and water-free calcium sulphate are subjected to thermal processing to form in it calcium carbonate. The invention is developed in dependent items of the invention formula.

EFFECT: provision of considerable concrete expansion in the period from 2 to 7 days after laying, which makes it possible to develop high early compression strength.

9 cl, 7 tbl

FIELD: construction.

SUBSTANCE: method of preparing the concrete mixture, consisting in mixing of cement, aggregates, water, and aqueous suspension of complex modifier of the following composition, wt %: silica fume 40-70; chemical additives 2-10; water - the rest, which is dried prior to mixing in the air stream to obtain powder consisting of granules, according to the invention, the aqueous suspension of complex modifier before mixing is subject to drying under the influence of continuous electromagnetic field of ultra-high frequency of 400-1000 MHz from microwave oscillators and heated air stream of microwave oscillator cooling to obtain powder with grains of size up to 500 microns and moisture of 9-12%; then the dried powdered complex modifier and cement are subjected to dispersion and disaggregation via exposure to pulsed electromagnetic field of ultra-high frequency of 1000-3000 MHz lasting 1-1.5 seconds, till the obtention of ultrafine powder of complex modifier with size of 60-100 nm, moisture of 1-8% and cement of size 0.1-5 microns, after that they are mixed, ground together and activated, form the disaggregated and activated mixture of cement and complex modifier, which is mixed with filler and water, concrete mixture is obtained; this mixture is subjected to the influence of powerful pulsed electromagnetic field of ultra-high frequency of 400-1000 MHz with duration of 1100÷nanoseconds.

EFFECT: increase of strength of concrete mixture.

1 tbl

FIELD: chemistry.

SUBSTANCE: composition for producing structural materials, comprising mineral binder, filler, water and nanomaterials, characterised by that the mineral binder is cement M-500 and bentonite clays, the filler is aluminosilicate microspheres (Al2O3) with diameter of 5.0-500 mcm, and as nanomaterials, the composition further includes a microstructure of needle-like wollastonite filler MIVOLL-97, free of natural calcium metal silicate, and fractional microcalcite MICARB "STANDARD"-96 and a foaming agent PB-200, with the following ratio of components, wt %: bentonite clays 2.0-8.0, aluminosilicate microspheres with diameter of 5.0-500.0 mcm 3.0-25.0, MIVOLL-97 - 1.5-5.5, MICARB "STANDARD"-96 - 2.0-8.0, silicon nanostructures AEROSIL - 2.0-5.0, foaming agent PB-200 - 1.0-4.0, water - 3.0-15, cement M-500 - the balance.

EFFECT: obtaining a high-strength composition with improved processing properties structural materials, the present combination of ingredients of the composition is optimal and enhances positive working qualities thereof.

4 ex, 5 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to special concrete compositions and can be used in the industry of structural materials in producing radiation-proof concrete, including concrete for "dry protection" of a nuclear power plant reactor. The radiation-proof concrete composition contains inorganic binder, serpentinite chips with particle size of 5-20 mm, serpentinite peebles, water, the composition being characterised by that it further contains a superplasticiser, calcium oxide, magnesium oxide, barium oxide or mixtures thereof, with the following ratio of components, wt %: inorganic binder 5.0-20.0; serpentinite chips with particle size of 5-20 mm 31.0-55.0; serpentinite peebles 6.0-30.0; alkali-earth metal oxides 8.9-10.0; superplasticiser 0.1-1.0; water 4.0-8.0.

EFFECT: high quality of concrete as a result of improved workability and reduced demixing when applying the concrete mixture due to reduced water segregation and mortar segregation, as well as faster drying of the concrete.

2 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: in a method of producing a porous aggregate, which includes preparation of a ceramic casting mixture, immersing aggregate particles into the mixture, drying said particles and firing, drying is carried out to moisture content of no more than 6%, firing is carried out at temperature of 850-1200°C and the aggregate used is natural vermiculite with particle size of 5-10 mm, wherein the mixture has the following composition, wt %: natural vermiculite 20-25, clay 24-30, water 45-50, colouring additive1-5. The method includes impregnating the porous aggregate with sodium ethyl siliconate or sodium methyl siliconate, followed by drying.

EFFECT: obtaining a light-weight, high-strength decorative porous aggregate.

2 cl, 3 ex

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