Granulated composite filler based on diatomite for concrete mixture and concrete building product

FIELD: construction.

SUBSTANCE: granulated composite filler for concrete products of size 0.5-10.0 mm, consisting of core and shell, wherein the core is obtained by granulating the mixture together with diatomite and sodium hydroxide milled up to the specific surface area of 150-250 m2/kg at their weight ratio of 0.70-0.95:0.05-0.30 with bond by aqueous solution of sodium silicate with density of 1.2-1.3 g/cm3 in the amount of 0.1-7.0 wt % of mixture, and shell is formed on the surface of core by its balling with dry dust mixture together with milled quicklime and silicofluoride sodium in a weight ratio of 0.85-0.95:0.05-0.15 with the subsequent hardening up to the strength not less than 0.12 MPa, after the indicated balling the additional spraying of 40% aqueous solution of oxalic aldehyde in the amount of 1.0-8.0 wt % (per 100% substance) of weight of shell components is carried out. Concrete building product is obtained by using the granulated filler indicated above.

EFFECT: decrease of thermal conductivity and water resistance of concrete products when increasing and maintaining the strength characteristics.

2 cl, 1 tbl, 1 ex

 

The invention relates to the production of building materials and can be used to obtain concrete building products subjected to heat and moisture treatment, hardening, for civil and industrial construction.

Known granular filler to obtain a concrete mixture consisting of core and containment. The core is manufactured by granulation on a plate granulator mixture of dispersed silica components - ash TPP (dispersion of not less than 200 m2/kg) and sludge wastewater treatment plant biological treatment of industrial wastewater with a bunch - ground lime (dispersion of 500-600 m2/kg) and gypsum (mark of not less than 100 and dispersion of not less than 350 m2/kg) mixing ratio, respectively, 0.3:0,5:0,15:0.05 mass. After granulation on the core is coated with the protective sheath thickness of 3-5 mm by wetting the core granules with liquid glass and dusting or okutyvaya on disc or drum granulator dry powdered mixture of lime, gypsum and mineral dispersed filler (ash TPP, TPP, loam etc) in the ratio of mixture components, respectively, of 0.35:0,10:0,55 mass. After the formation of granules with the purpose of curing applies heat and humidity treatment at a temperature of 90°C with isothermal aging for one hour, the [Patent RF №2077517, CL 6 SW 20/10, 1993].

A disadvantage of the known granular filler is that the resulting concrete products exposed to heat and moisture treatment, hardening, have low thermal insulation ability and strength, can not provide increased water resistance of the resulting concrete products.

Closest to the proposed solution is the use of unburned granular filler to obtain a concrete mixture. Concrete mix, in addition to Portland cement and fine aggregate (silica sand), includes composite filler in the form of unburned pellets on the basis of diatomaceous earth and sodium hydroxide. The technology of manufacturing of concrete products for the prototype includes the mixing of the components of composite granular aggregate, Portland cement, silica sand and water, molding and heat treated them in the steam chamber for mode 2+6+2 at atmospheric pressure and a temperature of isothermal aging 85-95°C for 6 hours [RF Patent №2361834, CL SW 28/04, 2007].

The disadvantages of this granular aggregate and concrete products is the fact that the filler can significantly reduce the heat; to provide increased resistance of concrete products.

The present invention n is purposed to reduce thermal conductivity while improving and maintaining the strength characteristics of concrete products, reducing water resistance.

This result is achieved by using granulated composite filler for concrete (0.5-10.0 mm, consisting of a core and a shell, where the core is obtained by granulating the mixture together ground to the specific surface area of 150-250 m2/kg of diatomaceous earth and sodium hydroxide in their mass ratio 0,70-0,95:0,05-0,30 with a bunch of water solution of sodium silicate density of 1.2-1.3 g/cm3in an amount of 0.1-7.0 wt.% from the mixture, and the shell formed on the surface of the nucleus balling his dry powdered mix together ground unslaked lime and sodium silicofluoride in a mass ratio of 0.85-of 0.95:0.05 to 0.15, followed by hardening to strength not less than 0.12 MPa, which according to the proposed solution after a specified okutyvaya provide additional spraying of a 40%aqueous solution of glyoxal in an amount of 0.1 to 8.0 wt.% (100%substance) from the mass shell components.

Glyoxal is an organic compound with the formula ONCE. Has the appearance of a yellow liquid with a smell of formalin. Is the simplest MDA - substance containing two aldehyde groups.

Usually sold 40% liquid.

The bifunctional molecule of glyoxal provides its specific activity in relation to many materials that are widely used in construction is the industry. From practice it is known that the introduction of the concrete glyoxal gives them moisture, to improve their adhesion to the solutions. Glyoxal is used in the manufacture of durable and water-resistant grades of concrete.

Declare the concrete product is characterized by the fact that it is obtained using the specified placeholder.

Feature components:

1. As a binder in obtaining concrete samples used Portland cement JSC "Belgorodcement" according to GOST 10178-85. Brand cement 400. Normal density of cement grout in accordance with GOST 310.4-81-27,12%, activity in the steaming of 38.4 MPa, activity under normal curing age of 28 days - 43,7 MPa.

2. As fine aggregate concrete mixes used natural quartz Wolski sand GOST 6139-2003.

3. For the manufacture of cores of filler used diatomite viazovsky also field, Ulyanovsk region. Chemical composition, wt.%: SiO2- 82,4; Al2O3- 6,2, Fe2O3- 2.4GHz, CaO - 0,9; MgO - 0,8; R2O - 0,3; PPP - 5,1.

4. Sodium hydroxide according to GOST 2263-79.

5. For the manufacture of a protective sheath filler used quicklime construction industry JSC "building Materials", Belgorod according to GOST 9179-77.

6. Glyoxal on THE 2633-003-67017122-2011, CAS number 107-22-2 sold in the form of a 40% aqueous solution.

7. Sodium silicofluoride Na2 SiF6on THE other 6-09-1461-91.

8. The water tap according to GOST 23732-79.

9. When granulating powder together ground diatomite with sodium hydroxide on a plate granulator as ligaments used an aqueous solution of sodium silicate (liquid glass) TU 2385-001-54824507-2000 density of 1.25 g/cm3.

To obtain nuclei of granular filler when implementing the inventive method of producing concrete products crushed diatomite they dosaged with sodium hydroxide by the gravimetric method. The resulting mixture was loaded into a ball mill, and produced mixing and grinding to achieve a specific surface area of 200 m2/kg. Granulating the obtained mixture was performed using disc granulator by spraying on the surface of the powder aqueous solution of sodium silicate density of 1.25 g/cm3. Speed and angle of inclination of the plate granulator regulate the diameter of the granular material. The obtained cores were sent to the washing powder lime, ground together with sodium silicofluoride at a ratio of 0.9:0.1 to by weight. On the sieve with mesh size of 0.5 mm was separated granular material and sent to storage at ambient temperature.

Through the nozzle from a separate container on the surface of powdered lime and sodium silicofluoride granules were sprayed with 4%aqueous solution of glyoxal. The number was regulated by a flow meter. During storage, control is performed after the curing of granulated filler by testing in the cylinder according to GOST 9758.

Example. Preparation of nuclei of granular fill. Diatomite (8 kg) and sodium hydroxide (2 kg), i.e. in the ratio of 0.80:0.20, the mass was ground in a mill together until the specific surface area of 200 m2/kg. Obtained powder material was applied on the plate granulator. On the surface of the powder by spray was applied an aqueous solution of sodium silicate density of 1.25 g/cm3. Speed and angle of inclination of the plate granulator regulate the diameter of the produced nuclei, which was in this case 4.4 to 4.5 mm

Obtaining a protective coating on the cores. The obtained cores were sent to the dusting powder lime (to 8.57 kg) ground together with sodium silicofluoride (0.93 kg) to obtain pellets of a size of 5.0 mm, the Powder produced in a drum mixer. On the sieve with mesh size of 0.5 mm was separated granulated powdered material and sent for treatment in an aqueous solution of glyoxal. Treatment was uniformly sprayed over the surface of the obtained granules 40%aqueous solution of glyoxal. The dispersion liquid was produced from a separate container through the flow meter, sprayed glyoxal in the amount of 0.5 kg per which account for 100%of the substance (5 mass%), i.e. 1.25 kg of solution (a mixture of 1, table).

Part of the obtained granulated material after storage for 7 hours at ambient temperature were tested for strength by compression in the cylinder according to GOST 9758, attention was paid to preserve the integrity of the shell; the rest used in the preparation of concrete mixtures for the manufacture of test specimens. The strength of granules during compression amounted to 0.29 MPa, the membrane pellets were retained its integrity.

The concrete mix. The dosage of the components produced weight: 2 kg of Portland cement (20 wt.%, table., a mixture of 1), 2.5 kg (25 wt.%) quartz sand and 3.5 kg (35 wt.%) granulated filler were mixed in a screw mixer until smooth and added 2 kg (20 wt.%) water.

The molded samples were produced in the traditional way by filling in standard forms FC-100 GOST 10181-2000. The exposure time in the form of 6 hours.

Heat-moisture treatment of concrete samples produced in the steam chamber at atmospheric pressure for mode 2+6+2 and the temperature of isothermal aging at 90°C. Thus, the preparation of concrete mixture, forming samples and heat-moisture treatment was made according to the prototype [RF Patent №2361834, CL SW 28/04, 2007]. Time isothermal exposure ranged from 3 to 6 hours, monitoring the status is of the internal structure of concrete samples instrument.

The core of the aggregate of the prototype (see RF patent №2361834, example No. 11) did not contain alkylsulfonate and the average granular filler had the strength cylinder crushing 0.3 MPa.

Samples of concrete were tested for strength (according to GOST 10180), determined the resistant (according to GOST 12730.5-84). The results are given in table. (mixture 1).

In the same way were obtained concrete products with other components in the kernel of granular fill.

Analysis of the test results of sample properties of concrete construction products shows the following.

1. Introduction in the concrete composition of the inventive granular filler consisting of a nucleus in the form of interconnected liquid glass together crushed diatomaceous earth and sodium hydroxide, which is covered by a shell of ground lime, sodium silicofluoride with the addition of 5.0 wt.% glyoxal, allows to obtain durable concrete products with enhanced resistant (mixture 1).

2. The reduction in the number of glyoxal in the shell granular aggregate up to 0.1 wt.% reduces hardening ability of the membrane obtained granules with heat and moisture treatment, which increases the strength of the resulting concrete to a lesser extent (mix 2), this part is taken as the boundary.

Further reduction of the gli is xala in the composition of the shell of the nucleus granular aggregate concrete products leads to a significant reduction in the effectiveness of this additive on the hardening of the shell core granular filler and increase strength concrete products in General, therefore, the composition of the mixture 4 is beyond the scope claimed.

The composition and properties of granulated filler on the basis of diatomite, the concrete composition and properties derived from these concrete products are given in the table.

3. The increase in the number of glyoxal in the kernel of granular filler to 8.0 wt.% shows its effectiveness to increase strength and reduce permeability of the resulting concrete. Concrete products are characterized by high mechanical strength and water resistance, low heat conductivity. However, there is a decrease in the mechanical strength of the shell granular material that is extremely important indicator in the manufacture of concrete. Therefore, this composition is taken as the boundary (mixture 3).

A further increase of glyoxal in the kernel of granulated filler leads to a significant reduction in the mechanical strength of the shell granular filler, the integrity of the shell is broken, thermal conductivity of the product increases. Such granular filler becomes unsuitable for the production of concrete products, therefore, the composition of the mixture 5 is beyond the scope claimed.

At the optimum ratio of components (a mixture of 1, table). the resulting concrete ed is Leah have increased by 30-35%, the mechanical strength, water resistance and low thermal conductivity through the creation of a developed system of confined reinforced waterproof spheres in the array of concrete products.

When using concrete mixtures with boundary components (mixture of 2 and 3, table). the resulting concrete product virtually retain the water resistance and strength characteristics compared to similar properties of the prototype.

During steam curing of concrete products in the nuclei of granular aggregates synthesized water-soluble silicates of sodium, which is impregnated with the membrane of the granules and in the presence of glyoxal in the claimed amounts create a durable waterproof film. Part of hydrosilicates sodium penetrates into the concrete matrix, which has a beneficial effect on the processes silicotuberculosis concrete structure, and strengthens it. The creation of a system of closed hardened pores in the concrete matrix allows not only to obtain a hardened product, but also significantly reduce their conductivity and permeability.

Practice shows that the use of the inventive granular aggregates significantly reduces the conductivity and permeability of the resulting concrete products, increases their strength.

1. Granular composite aggregate for concrete products by size of 0.5 to 10.0 is m, consisting of a core and a shell, where the core is obtained by granulating the mixture together ground to the specific surface area of 150-250 m2/kg of diatomaceous earth and sodium hydroxide in their mass ratio 0,70-0,95:0,05-0,30 with a bunch of water solution of sodium silicate density of 1.2-1.3 g/cm3in an amount of 0.1-7.0 wt.% from the mixture, and the shell formed on the surface of the nucleus balling his dry powdered mix together ground unslaked lime and sodium silicofluoride in a mass ratio of 0.85-of 0.95:0.05 to 0.15, followed by hardening to strength not less than 0.12 MPa, characterized in that after the specified okutyvaya provide additional spraying of a 40%aqueous solution of glyoxal in an amount of 1.0 to 8.0 wt.% (100%substance) from the mass shell components.

2. Concrete construction product, characterized in that it contains a granular filler according to claim 1.



 

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7 cl, 3 tbl

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1 ex, 2 tbl

FIELD: chemistry.

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1 ex, 2 tbl

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2 cl, 5 tbl

FIELD: chemistry.

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EFFECT: high efficiency of the method.

1 tbl, 7 ex

FIELD: chemistry.

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EFFECT: simple process, obtaining granules with low thermal conductivity, high strength, water resistance and frost resistance.

1 cl, 2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to production of synthetic porous aggregates for concrete. The method of producing synthetic porous aggregate involves preparation of clay material and fuel, moulding semi-finished products, drying and burning. Mouldable clay material is laid in at least two 20-30 mm thick layers. A 3-5 mm thick fuel layer is placed between the layers of clay material. Moulded semi-finished products are dried to moisture of 2-5%. The semi-finished products are crushed and fractionated after burning. A version of the method of producing synthetic porous aggregate is described.

EFFECT: simple technology of producing porous aggregate.

2 cl

FIELD: chemistry.

SUBSTANCE: subject of the present invention is a dry binder premix which contains the following, wt %: portland clinker having a Blaine specific surface area of 4500 to 9500 cm2/g, preferably 5500 to 8000 cm2/g, the minimum quantity of the clinker by mass percentage relative to the total mass of the premix being determined according to formula (I): [-6.10-3×SSBk]+75, in which SSBk is the Blaine specific surface area given in cm2/g; fly ash; at least one alkali metal sulphate, the quantity of alkali metal sulphate being such that the quantity of equivalent Na2O in the premix is greater than or equal to 5 wt% relative to the mass of fly ash; at least one source of SO3, in a quantity such that the quantity of SO3 in the premix is greater than or equal to 2 wt % by relative to the mass of portland clinker; complementary materials having a Dv90 less than or equal to 200 mcm selected from limestone powders, the quantity of clinker+the quantity of fly ash being greater than or equal to 75 wt %, preferably 78 wt %, relative to the total mass of the premix; the total quantity of clinker in the premix being strictly less than 60 wt % relative to the total mass of the premix. The subject of the invention is also a dry binder mix obtained by mixing said premix with aggregates, as well as a concrete grout composition obtained by mixing with water.

EFFECT: obtaining concrete with low carbon dioxide emission.

13 cl, 1 dwg, 3 tbl

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