Production of expanded-clay concrete

FIELD: process engineering.

SUBSTANCE: invention relates to production of construction materials, particularly, expanded-clay concrete to be used for production of reinforced concrete articles for building blocks. Proposed method comprises activation of 70% of tempering water by quick-action Portland cement and plasticising additive UP-4 in concrete mixer at 15 rpm for 1 min to get homogeneous suspension. Tempering water remainder is mixed with crushed haydite gravel, haydite and quartz sand with pre-activated tempering water for 0.5 minutes. Obtained haydite mix is subjected to two-step heat treatment at 60°C in summer for 5 hours, in winter for 8 hours. Then, it is treated in secondary heat treatment chamber at 40°C for 4 hours.

EFFECT: better placeability, higher strength, accelerated production.

2 tbl

 

The invention relates to the production of building materials, mainly for the production of concrete, based on expanded clay gravel for making concrete products in a three-block construction.

Known method of preparing porous claydite-concrete, including preliminary screening of large pellets of clay, preliminary mixing metered quantities of water and clay, cement additive and final mixing to a uniform consistency (see RF patent for the invention №2135435, CL C04B 38/08. 1999. Fig.1 (similar to 1).

The disadvantage of this method is the low strength of claydite-concrete and additional costs of material resources necessary for the implementation of pre-screening of expanded clay granules.

Closest to the proposed invention is a method comprising mixing the mixing water and additives waste of sugar manufacture, further additives other components, the final mixing to a uniform consistency with subsequent hydrothermal treatment of the molded product (see USSR author's certificate No. 1601095, CL C04B 38/8, 1990. Table 2, 3 (prototype).

The disadvantage of this method is that it does not provide the necessary workability of concrete mixture and the required compressive strength, and requires C is increased cement consumption, what complicates the practical implementation of the invention.

The technical result achieved by the present invention is the improvement of workability, increasing the strength of claydite-concrete while reducing time to production of finished products.

This technical result is achieved in that in the method, including the activation of 70% of the mixing water with cement and plasticizing additive for 1 min, followed by the addition of crushed expanded clay gravel, quartz and clay sand, the remaining parts of water mixing and final mixing not more than 0.5 min, involve a two-step heat treatment claydite-concrete at t=60°C (in summer, 5 h, in the winter time 8 h) and in the chamber of the secondary heat treatment (QVTO) at t=40°C for 4 hours

Improving the distribution uniformity of water in the cement and the separation of sticky particles in the process of mechanical activation leads to the formation of a more uniform structure, providing improved technological properties and higher quality hardened claydite-concrete. The claydite-concrete strength increases as well due to increase adhesion of the cement stone with a porous body crushed clay gravel and the surface of the sand particles. This is because available in expanded clay gravel pores are filled price is entnum dough and form a rigid skeletal frame, linking crushed expanded clay gravel and sand particles. Thanks to two-stage heat treatment the claydite-concrete, prepared according to the invention, has a high structural strength.

Under the proposed method expanded-clay lightweight concrete is prepared in two stages: the first stage mixer conduct activation (15 rpm) 70% of the mixing water with cement 500 M and plasticizing additive. In the second stage in the mixer load of crushed expanded clay gravel, quartz sand, clay sand, the remaining portion of the mixing water, and do the final mixing for 0.5 min Then provide a two-stage thermal treatment of concrete mixtures at t=60°C (in summer, 5 h, in the winter time 8 h) and in the chamber of the secondary heat treatment (QVTO) at t=40°C for 4 hours

The proposed method was tested in conditions of scrollborder (Certificate of accreditation No. 05.18.2067 from 20.10.2006,). As the binder ingredient used rapid hardening Portland cement PC-500B according to GOST 10178-85. As the coarse aggregate used: crushed expanded clay gravel according to GOST 9759-83 (Gravel, crushed stone and sand artificial porous. Technical conditions) fraction 5-10 mm with a bulk density ρ equal to 900 kg/m3according to GOST 9757-90. Small filler are silica sand with module croup is barb MCR-2.1 and a bulk density ρ, equal 1640 kg/m3according to GOST 8736-85, and expanded clay sand fraction 0-5 mm with a bulk density ρ equal to 700 kg/m3according to GOST 9757-90. Test sand was carried out according to GOST 8735-88 (Sand for construction works. Test methods). For mixing concrete mix water is used according to GOST 23732-79 (Water for concrete and mortars. Technical terms.). As plasticizing agents used naphthalenesulfonate C4H9C10H6SO3Na, representing a neutralized low molecular weight reaction product of the condensation of naphthalenesulfonate and formaldehyde and which is a side effect of the pulp and paper industry. The complex additive pack-4 on the basis of a neutralized low molecular weight reaction products of condensation of naphthalenesulfonate and formaldehyde, manufactured LLC "Fort", , Novozybkov, GOST 24211-2003, THE 5745-002-13453677-2004 (developed NIIZHB)

To determine the strength was tested prototypes cube with edge 100 mm at the age of 28 days normal curing according to GOST 10180-90 (Concretes. Methods for determining the strength of the control samples). The strength of claydite-concrete age of 28 days normal curing is 19,65-25,87 MPa.

The invention will explore five experienced options compositions of components in samples of claydite-concrete, which is s presented in table 1.

To obtain comparative data the initial mixture (composition No. 1) for claydite-concrete prepared with the one-stage method without activation of the mixing water with cement and plasticizing additive, and the proposed method (compounds 2-5). Unlike the original composition No. 1, the second and subsequent embodiments, the amount of cement has been reduced by 20%.

The test results presented in table 2. As can be seen from table 2, the best results are achieved when using composition No. 2.

The tests allow us to establish that cooking claydite-concrete under the proposed method, including the activation of 70% of the mixing water with cement and plasticizing additive for 1 min, followed by the addition of crushed expanded clay gravel, quartz and clay sand, the remaining parts of water mixing and final mixing not more than 0.5 min, providing a two-stage heat treatment claydite-concrete at t=60°C (in summer, 5 h, in the winter time 8 h) and in the chamber of the secondary heat treatment (QVTO) at t=40°C for 4 h, allows to increase workability, increase the durability of the finished products up to 75% and 20% to reduce the consumption of cement.

Table 1 - Compositions of components claydite-concrete
ComponentsContent, wt.%, of
12345
Cement15,512,412,412,412,4
Quartz sand1726,71915,827,2
Leca52,546,956,25747,07
Ceramsite sand-the 4.74,44,27the 4.7
Additive pack-4-0,140,120,140,12
Water159,16 7,88accounted for 10.398,51

Table 2 - test Results test cubes
№p/pConditions of hardeningBrand placeabilityBulk density of fresh concrete, kg/m3The limit of compressive strength at the age of 28 days, MPa/%
Composition No. 1 (the one without additives)
1Excerpt 2 h, followed by hydrothermal treatment in the steam chamber in the following mode: 2 h temperature rise +8 h exposure +2 h the temperature reductionP-2169814,8/100
Composition No. 2 (preparation of the mixing water and cement from 0.14% plasticizing additive to obtain a homogeneous suspension at 15 rpm)
2Two-stage heat treatment at t=60°C (in summer, 5 h, in the winter time 8 h) and in the chamber of the secondary heat treatment at t=40°C for h P-4162625,87/175
Composition No. 3 (preparation of the mixing water and cement from 0.12% plasticizing additive to obtain a homogeneous suspension at 15 rpm)
3Two-stage heat treatment at t=50°C (in summer, 5 h, in the winter time 8 h) and in the chamber of the secondary heat treatment at t=50°C for 4 hP-3162723,41/158
Composition No. 4 (preparation of the mixing water and cement from 0.14% plasticizing additive to obtain a homogeneous suspension at 10 rpm)
4Two-stage heat treatment at t=60°C (in summer, 5 h, in the winter time 8 h) and in the chamber of the secondary heat treatment at t=40°C for 4 hA-5162520,02/135
Composition No. 4 (preparation of the mixing water and cement from 0.12% plasticizing additive to obtain a homogeneous suspension at 10 rpm)
5The two-those who provide logistical processing at t=50°C (in summer, 5 h, in the winter time 8 h) and in the chamber of the secondary heat treatment at t=50°C for 4 hP-4162019,95/133

Method of preparation of claydite-concrete, including activation of the mixing water plasticizing additive, the final mixing of the activated mixing water, cement, coarse and fine aggregates with subsequent treatment of concrete mixtures, characterized in that the activation 70% of the mixing water fast Portland cement and plasticizing additive pack-4 mixer at 15 rpm for 1 min to obtain a homogeneous suspension, and then perform the final mixing of the remaining part of the mixing water, crushed expanded clay gravel, clay and quartz sand with a pre-activated mixing water for 0.5 min, the obtained concrete mixture is subjected to two-stage heat treatment at a temperature of 60°C in the summer for 5 h, in the winter for 8 h and in the chamber of the secondary heat treatment at a temperature of 40°C for 4 h



 

Same patents:

FIELD: heating.

SUBSTANCE: invention relates to construction industry, namely, to the methods of concrete thermal treatment and can be used in construction for manufacturing of precast concrete or reinforced concrete items and structures. The method of thermal treatment for concrete and reinforced concrete items implies cyclic heating by supplying saturated steam, switching the steam supply off, maturing of items, repeated supply of saturated steam, switching the steam supply off, maturing of items up to their cooling. In the first cycle the saturated steam is supplied up to reaching the medium's temperature of 30°C for 0.5 hours, isothermic maturing of items is carried out under the temperature of 30°C for 2.5 hours, in the second cycle the saturated steam is supplied up to reaching the medium's temperature of 40°C for 0.5 hours and isothermic maturing of items is carried out under the temperature of 40°C for 5.5 hours.

EFFECT: invention allows for boosting of concrete strength gain.

1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to construction, namely, to concrete and reinforced concrete article drying chambers. Proposed chamber comprises walls, detachable translucent cover and heat power feed system. Chamber guard structure and said detachable cover are made of combined material including metal, asbestos sheet, foil with heat insulation provided with air layer confined by two layers of foil. Layer of asbestos at chamber inner walls is covered by foil. IR radiators, portable heat sensor are arranged at chamber bottom while water like with sprinklers is laid around the periphery. Electrical protection contact device is arranged ay chamber r top part.

EFFECT: decreased heat losses.

1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to making articles by carbonisation. The method of making an article primarily bound by a carbonate involves producing granular alkaline material with pH of at least 8.3, containing at least one alkali-earth metal silicate phase, pressing said material to obtain a workpiece with porosity of not more than 37 vol. % and permeability of at least 1·10-12 cm2, reacting the workpiece, not saturated with moisture, with CO2 at temperature of at least 70°C and pressure of at least 0.5 MPa in the presence of water to obtain at least 5 wt % carbonates. The article primarily bound by a carbonate is obtained using said method. The invention is developed in subclaims.

EFFECT: improved mechanical and/or physical-chemical properties.

34 cl, 10 tbl, 22 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to construction, particularly, to electromagnetic treatment of concrete mixes. Proposed method comprises loading the mix inside concrete mixer vibratory electric reactor accommodating three electrodes, mix heating, vibration and unloading. Prior to loading concrete mix inert components, water is heated in two-circuit process in electrode vessel to 80°C, heat carrier being transferred by electrically driven pump into second external circuit with cold water tank for mixing with hot flow. Then, said inert components are mixed with concrete by blades to discharge made mix directly via concrete mixer reduction gear and motor and loading branch pipe into hot water tank at 40°C. Then, electrically drive vibrators are connected.

EFFECT: higher hardness, optimised process.

2 cl, 2 dwg

FIELD: construction.

SUBSTANCE: in the method to produce a cellular construction material, including mixing of silica-containing and alkaline components and water at the ratio of alkaline component content to content of a silica-containing component from 0.08 to 0.40 and ratio of total content of silica-containing and alkaline components to water content up to 5.3 to produce a homogeneous silicate mass, its drying and grinding, filling the mass into moulds and heating to swelling temperature in the range from 650 to 900°C with further cooldown to ambient temperature, the silicate mass after drying is ground to the particle size of 3.5-20 mm, and heating of the mass to swelling temperature is carried out at continuous temperature increase.

EFFECT: reduction of power inputs for production of a cellular construction material with preservation of its properties.

1 ex

FIELD: construction.

SUBSTANCE: invention may be used for lining industrial heat aggregates, operating at the temperature of up to 1350°C and, in particular, for lining of brick burning cars. The method includes mixing of a chamotte filler with fraction of 5-10 mm and less than 5 mm, a self-decomposing ferrochrome slag and an aqueous solution of caustic soda. Fireproof fibre and portland cement are added into a dry mix prior to tempering with the aqueous solution of caustic soda at the following ratio of components, wt %: Chamotte of fraction 5-10 mm 30-31; Chamotte of fraction less than 5 mm 28-30; Self-decomposing ferrochrome slag 23.5-25.5; Solid caustic soda 3-4; Fireproof fibre 0,5-1; Portland cement 1-1.5; Water 10-11. The method to make items from a fireproof concrete mix includes its hardening and compaction, at the same time hardening of the produced concrete mix is carried out for 24 hours during thermal treatment according to the following mode: raising temperature up to 60-65°C for 1.5-2 hr, soaking at 60-70°C for 4 hr, raising temperature up to 90-95°C for 1.5-2 hr, soaking at 90-95°C for 4 hr, raising temperature up to 110-120°C for 2 hr, soaking at 110-120°C for 7-8 hr, reducing temperature down to 50-70°C for 3 hr.

EFFECT: increased strength of concrete and heat resistance.

2 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a novel method of making articles in form of slabs, porous slabs, blocks made from a conglomerate consisting of pieces of stone. The method is based on the existing technology of compaction by means of vacuum compression and involves preparation of a mixture consisting of a granulate and binder which is an aqueous dispersion of an acrylic prepolymer. The granulate is selected from stone-like materials. The mixture also contains a finely dispersed inorganic aggregate. The mixture is deposited in form of a layer onto a substrate or inside a mould and is compacted via vacuum vibro-compression. Further, the binder which is present in the moulded article is hardened. At the step for compaction using vacuum vibro-compression, the article hardens in conditions which enable to prevent removal of water from the mixture due to evaporation. When making porous slabs, at the compacting step, the article hardens in conditions which enable to remove water from the mixture. When making blocks, the mixture is deposited only inside the mould. When using the method, blocks can also be made, which can then be sawed.

EFFECT: articles have high mechanical strength, resistance to UV radiation and are environmentally safe.

18 cl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to industrial and civil construction and can be used in building monolithic concrete and reinforced concrete structures. The method of building monolithic concrete and reinforced concrete structures involves pre-heating a concrete mixture to temperature not higher than 80°C, putting the concrete mixture into a heat-insulated mould and compacting. The concrete mixture is then held in the heat-insulated mould at ambient temperature, where the holding period is limited by an irregular cooling period. Peripheral heating is carried out after holding, while maintaining a positive temperature gradient on the cross-section of the structure from the centre to the periphery.

EFFECT: method ensures good quality and shortens the time required to build monolithic concrete and reinforced concrete structures.

1 cl

FIELD: construction.

SUBSTANCE: method includes pouring concrete mix into curb, its compaction, subsequent heating with the help of electric heating elements of core in structure and peripheral zone. Core is heated until strength R is gained, making at least 0.25Kz8, where R is strength of concrete, which is 28 days old. Heating of peripheral zone is done with observation of temperature gradient in section , value of which is maintained in the range of from core of structure to periphery.

EFFECT: reduced duration of process and improved quality of structure.

3 cl, 3 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to industrial construction materials, and more specifically to double-layer structures and method of making such structures, particularly non-sparking double-layer tiles, meant or covering floors in category A and B fire safety buildings. The non-sparking double-layer tile is in form of a concrete monolithic body with a face layer, which has a regular or irregular geometrical shape, where material for both layers is a mixture, used in semi-dry state, containing, wt %: composition of the mixture of the base layer: portland cement of at least grade 500 DO 20.55 to 22.78, construction sand with particle size 5 mm with fineness modulus of not less than 2.4 72.89 to 75.34, Poliplast MB-1 0.20-0.30, water - the rest; composition of the mixture of the face layer: portland cement of at least grade 500 DO 23.98 to 26.19, limestone in form of sand from siftings from crushing sedimentary rocks with strength grade of at least 400 with particle size 2 to 4 mm and fineness module of not less than 2.4 69.84-71.94, Poliplast MB-1 0.23 to 0.30, water - the rest, where the face layer has thickness of not less than 10 mm. The method of making the said tile involves preparation of each of the said mixtures with moisture content of 6-8% in mixers by successive loading the given filler, additive, portlant cement, stirring dry components for 30 to 60 s, then, while stirring, adding water and continue to stir the mixture for the base layer for 30 to 40 s, and the mixture for the face layer - for 2 minutes, placing the mixture for the base layer into a mould, preliminary compacting with light vibration or ramming without vibration, placing the mixture for the face layer on top of the compacted base layer, final compacting with vibrocompression for 20 to 23 s of the said mixtures and solidification in a steam curing chamber at temperature of 40°C, moisture 95 to 100 % and rate of increase and decrease of temperature not more than 25°C/h. Invention is developed in subclaims.

EFFECT: increased compression and bending strength, reduced wearability.

4 cl, 4 ex, 3 tbl

FIELD: construction.

SUBSTANCE: composition of a haydite-concrete mixture includes, wt %: portland cement 18.87-21.34, haydite 41.13-41.56, superplasticiser LSTM 0.0312, fly ash of TPP 13.92-18.87, gasifying additive PAK-3 0.022-0.025, water - balance.

EFFECT: production of haydite concrete with higher strength and reduced density.

3 tbl

FIELD: construction.

SUBSTANCE: swollen perlite is used, which is first saturated with water, water that is not retained by a swollen perlite granule is filtered, the water-saturated perlite is mixed with gypsum, the produced mix is supplied into a die mould for further pressing, and pressed at 10 MPa at least.

EFFECT: increased strength of a finished product with increased time of mortar hardening.

2 cl

FIELD: construction.

SUBSTANCE: raw mix for making foam concrete includes, wt %: portland cement 35.0-37.0, foaming agent PB-2000 0.25-0.35, TPP ash 10.65-13.25, crushed foam glass of fraction 5-10 mm 20.0-25.0, mineral wool ground and sifted through sieve No. 2.5 1.0-1.5, haydite sand 5.0-7.0, water 21.0-23.0.

EFFECT: higher heat resistance of foam concrete produced from raw mix.

1 tbl

FIELD: construction.

SUBSTANCE: raw mixture contains the following components, pts. wt.: non-caking acid clay 58.0-61.0; expanded perlite ground to specific surface of 4500-5000 cm2/g 13.0-15.0; chalk stone 1.0-2.0; broken silicate glass ground to specific surface of 4500-5000 cm2/g 14.0-16.0; bentonite and/or kaolin 4.0-6.0; liquid potassium glass 4.0-6.0.

EFFECT: increase of product water-resisting property.

1 tbl

FIELD: construction.

SUBSTANCE: raw mixture for manufacture of foam concrete contains the following components, wt %: Portland cement 35.0-37.0, foaming agent PB-2000 0.25-0.35, TPP ash 15.65-20.25, crushed foamed glass with particle size of 5-10 mm 20.0-25.0, asbestos fibre cut into 5-15 mm pieces 1.0-1.5, and water 21.0-23.0.

EFFECT: improving heat resistance of foam concrete obtained from raw mixture.

1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to construction materials, in particular to manufacturing products from ethynol perlite concrete, applied for heat insulation of heat pipelines of heat networks and for manufacturing heat-insulated pipes of full operational readiness with monolithic thermohydroinsulating protection. Ethynol perlite concrete, obtained from composition, which contains perlite gravel with filling agent from inert materials; as such used are dust-like asbestos in form of powder in amount 0.2 ppm, expanded clay aggregate dust in amount 0.2 ppm, and fly ash of thermal power stations in amount 0.2 ppm, and composite cement in form of ethynol enamel based on ethynol varnish in amount 1 ppm and plasticiser, represented by latex SKS-65 in amount 0.1 ppm, and as accelerator of composition polymerisation used is intensive ultraviolet radiation.

EFFECT: increased quality of ethyl perlite concrete due to reduction of water absorption, heat conductivity coefficient, increase of water resistance and acceleration of hardening.

1 ex

Gypsum perlite // 2519146

FIELD: construction.

SUBSTANCE: gypsum perlite contains a gypsum binder, such as a processed mechanically activated phosphogypsum ground to 5-40 mcm (active gypsum), hydrophobizated swollen sand, superplasticiser Melflux at the following ratio of components, wt %: active gypsum - 84.8-93.8%, hydrophobizated swollen perlite sand - 6-15%, superplasticiser - 0.2%.

EFFECT: improved heat insulation and strength properties at low prime cost.

1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to production of construction materials and can be used for fabrication of ceramic bricks, stones and blocks. Proposed method comprises preparation of foam-ceramic mix from clay stock, water, foaming agent, binding agent, drying, annealing and forming. Note here that, additionally, foaming agent PB-2007 is admixed as a plasticising agent while finished product ground to 1.25-5.0 mm fraction or perlite sand are used as binding additive. Then, obtained mix is poured in flat moulds and dried, first, at 30-35°C and, then at 50-56°C to make an integral blank to be withdrawn from the mould, annealed at 800-1600°C and formed to blocks.

EFFECT: higher heat- and noise-isolation properties, decreased weight.

FIELD: chemistry.

SUBSTANCE: invention relates to construction materials, in particular to polystyrene concretes, used in heat-preserving protective structures of buildings and constructions. Heat-insulating constructive polystyrene concrete with density 225-350 kg/m3, is obtained from mixture, which contains Portland cement, water, complex air-involving and plasticising additive of multifunctional action, which represents balanced mixture in dry or liquid form, consisting of air-involving additive PO-01B based on products of oxidation of food industry wastes and plasticiser of polycarboxilate type or sulfonated product of polycondensation of melamine with formaldehyde with number of links in molecular chain equal 18-27 with weigh ratio: air-involving additive:plasticiser, equal 1:(0.25-0.5), and specific consumption of said complex additive 0.06-0.15 wt % of Portland cement weight, polystyrene foamed granulated (PFG) with volume content in polystyrene concrete - φ in the range 0.40-0.60, obtained after triple foaming of initial polystyrene beads with coarseness 0.7-1.0 mm and characterised by complex dimensionless index of PFG quality - n in the range 1.5-1.75, whose values are determined in the process of designing polystyrene concrete composition by formula: where K1 and K2 are coefficients, reflecting peculiarities of technology of PFG obtaining, values of which are respectively in the range1.1-1.3 and 8.0-10.8; db is the average diameter of initial polystyrene beads, mm; dav is average weighted diameter of PFG granules, mm; ρPFGb and ρPFG are bulk and average densities of PFG granules, kg/m3.

EFFECT: creation of heat-insulating constructive polystyrene concrete with density 225-350 kg/m3 with optimal properties: increased strength and heat-insulating properties.

3 ex, 1 tbl

FIELD: construction.

SUBSTANCE: heat-insulation structural masonry admixture based on a light filler contains, kg/m3: portland cement CEM1-42.5N 173-346, quartz sand from Razumenskoe deposit 700-1260, hollow microspheres of Novocherkasskaya regional power station 50-250, a water-retention additive Mecellose FMC 24502 0.1% of the portland cement mass, water - balance, besides, percentage content of light filler - specified microspheres - is given from the volume of sand.

EFFECT: reduced heat conductivity.

1 ex, 3 tbl

FIELD: construction engineering; manufacture of building structures.

SUBSTANCE: proposed method includes preparation of polystyrene concrete mix from binder, foamed polystyrene and water, molding articles from this mixture and heat treatment. Prior to preparation of mixture, foamed polystyrene is subjected to foaming performed at two stages as minimum. At two stages as minimum. At first stage, polystyrene gravel at density of 12-30 kg/cu m is obtained. At subsequent stages its density is brought to 6-11 kg/cu m; polystyrene gravel may be obtained by grinding wastes of articles made from polystyrene to grain composition of fractions to 1-15 mm. Introduced additionally into mixture is air-entrapping additive hardening accelerator and water-reducing additive which are thinned with water. Articles are molded by placing the mixture in metal molds. Mixture is fed to each cell of metal mold by means of hose by forcing it from pneumatic concrete mixer by compressed air. After heat treatment, metal molds containing articles are delivered to demolding station where are subjected to vibration treatment for separation of articles from molds. Then, articles are removed from metal molds. Line proposed for realization of this method includes foaming unit, service bins and proportioners for foamed polystyrene, binder and water, at least one pneumatic concrete mixer for preparation of polystyrene mixture and molding and demolding stations. Proportioners for aqueous solution of hardening accelerator, air-entrapping additive and water-reducing additive, service reservoirs for air-entrapping additive, hardening accelerator and water-reducing additive, screw feeder for delivery of binder to proportioner, vibration table, metal molds with covers, pipe lines with shut-off cocks and swivel chutes, control console and hose. Proportioner is located under service bin forming single reservoir which may be divided by mechanical splitter. Pneumatic concrete mixer is provided with horizontal shaft at volume of 0.6 to 2 cu m. Metal mold is provided with sump having hinged sides, partitions, cargo-gripping mechanism and cover located on sump of cassette. Each cassette is made in form of platform formed by horizontal square sheet and four vertical sheets rigidly secured on horizontal sheet, shifted relative to center axes and interconnected in T-shaped pattern perpendicularly relative to each other forming four cells over perimeter of platform and central cell. Cells over perimeter of platform have three free faces. Cargo-gripping mechanism is located in central cell partitions are mounted between cassettes and are pinched by two vertical sheets. Cover is made in form of metal sheet pressed to upper faces of cells, partitions and sides. According to second version, metal mold has sump and at least one cell heat-insulated articles. Each cell is formed by bottom of sump and two z-shaped profiles clamped together and provided with changeable inserts placed between z-shaped profile. Each z-shaped profile has two side and one central webs. Side surfaces of all webs are perpendicular to plane formed by sump bottom. Changeable inserts are secured on side webs of z-shaped profiles. Each z-shaped profile forms one of subsequent cells by its one cell.

EFFECT: extended technological capabilities; increased productivity; improved quality and enhanced reliability.

11 cl

Up!