Asphalt-concrete mixture

FIELD: chemistry.

SUBSTANCE: asphalt-concrete mixture containing oil viscous bitumen, a filling agent, sand with fraction to 5 mm, crushed stone and an additive contains as crushed stone crushed granite with fraction 5-15 mm, as sand - sweepings of rock crushing, as the filling agent - sludge of HES water preparation and as the additive - a homogeneous short-fibre cellulose fibre and an organomineral modifier, containing sludge of HES water preparation, Portland cement, a polymer additive Butonal NS 198 and sodium pyrophosphate, with the following component ratio, wt %: oil viscous bitumen 6.3-6.9, crushed granite with fraction 5-15 mm 62.8-67.5, sweepings of rock crushing with fraction 0-5 mm 13.5-17.6, homogeneous short-fibre cellulose fibre 0.2, filling agent - sludge of HES water preparation 12.47-12.48, sludge of HES water preparation 0.0158-0.0238, Portland cement 0.0016-0.00235, polymer additive Butonal NS 198 0.0024-0.00357, sodium pyrophosphate 0.0002-0.00028.

EFFECT: increased water resistance of asphalt-concrete mixtures.

2 tbl

 

The invention relates to compositions of asphalt mixtures and can be used in the production of wear-resistant durable pavement with adjustable operational-technological properties.

Known asphalt mixture (Patent RF №2190580), including bitumen, modifying additive and mineral filler, characterized in that it contains as modifying additives alkyldimethylammonium chloride, a mixture of alkyldimethylammonium chlorides with alkyl chains of normal structure containing from 10 to 16 carbon atoms at a certain ratio of components, wt.%:

Bitumen5,94-7,35
The above alkyldimethylammonium chloride0,05-0,15
Mineral fillerrest

The disadvantage of this asphalt mix are the low values of strength at temperatures of 20 and 50°C.

Known asphalt mixture (Patent RF №2196750), including sand, mineral powder, polymeric structuring additive and petroleum bitumen, characterized in that it contains oil viscous bitumen, as polymeric structures is the dominant additive contains rubber thermo-elastoplast and optionally surface-active plasticizing additive - tall oil pitch and screening crushing gravel fraction 0-5 mm in the following ratio, wt.%:

The sand16,0-20,0
Mineral powder10,0-15,0
Rubber TPR0,5-1,0
Oil viscous bitumen5,0-6,5
Tall peck0,3-0,5
Screening crushing gravel fraction 0-5 mm57,0-68,2

The disadvantage of this asphalt mix is a low strength value at 50°C and a low coefficient of resistance as long videosystem.

The closest is asphalt mixture (Patent RF №2204539)containing calcareous gravel fraction 5-20 mm, the sand fraction up to 5 mm, mineral powder, viscous oil bitumen and polymer additive, wherein the mineral powder it contains fly ash from the electrostatic precipitators of thermal power plants, as well as polymer additives - VAT residue synthesis polyvinylpyrrolidone, including, wt.%:

Limestone gravel fraction 5-20 mm35-45
Oil viscous bitumen5-6

The fly ash from the electrostatic precipitators heat

power3-8
VAT residue synthesis polyvinylpyrrolidone0,5-1,75%
mass of bitumen
The sand fraction up to 5 mmrest

The disadvantage of this asphalt mix is a low coefficient of resistance as long videosystem.

An object of the invention is to improve the water resistance of asphalt mixes.

The technical result of the invention is achieved by the fact that the asphalt mixture containing oil viscous bitumen, filler, sand, FR. up to 5 mm, gravel and Supplement contains as crushed granite gravel FR. 5-15 mm, sand - sifting crushing of rocks, filler - sludge treatment CHP and as an additive homogeneous karataviense cellulose fiber and organic modifier containing sludge water treatment, power plant, Portland cement, polymer additive Butonal NS 198 and p is Rotostat sodium, in the following ratio, wt.%:

Oil viscous bitumenfor 6.3 to 6.9
Granite crushed stone fractions 5-15 mm62,8 is 67.5
Screening of crushed rock fraction 0-5 mmof 13.5 to 17.6
Homogeneous karataviense cellulose fiber0,2
Filler - sludge treatment CHP12,47-12,48
Sludge treatment CHP0,0158-0,0238
Portland0,0016-0,00235
Polymer additive Butonal NS 1980,0024-0,00357
Sodium pyrophosphateis 0.0002-0,00028

As the oil viscous bitumen is bitumen road viscous BND 60/90, meets the requirements of GOST 22245.

For preparation of asphalt concrete mixtures used crushed granite fractions 5-10, 10-15 mm according to GOST 8267 (applies to crushed stone and gravel from rocks with an average density of grains from 2000 to 3000 kg/m3).

As dropout fractional the texts used screening crushing of rocks, meets the requirements of GOST 8736. Brand strength dropout crushing should not be below 1000, and the content of clay particles, determined by the method of swelling, should not exceed 0.5%. Screening crushing is fine aggregate asphalt mix.

As homogeneous karadiyanaru cellulose fiber fiber VIATOP, in which at least 50% of fibre length from 0.5 to 1.9 mm Cellulose fiber should be uniform, not to have impurities, to be resistant to heat up to a temperature of 180°C and have a moisture content not exceeding 10% by weight. Homogeneous karataviense cellulose fiber is a stabilizing additive.

As sludge treatment CHP is used sludge, representing obtained in the preparation of water precipitation following chemical composition, wt.%:

Organic part9,87
including oil products0,8
The mineral part (SiO2, Al2O3, CaO, MgO, Na2O, K2O.)71,74
including heavy metals1,63

The sludge must meet the requirements of GOST 52129-2003 "Powder mineral deasphalting and organic mixtures. Technical conditions".

As a Portland cement Portland cement is used according to GOST 31108-2003 "Cements for General construction. Technical conditions". Portland cement is an active hydraulic additive.

Polymer additive Butonal NS 198 is a styrene-butadiene latex composition comprising 20-40% of water and 1-5% ethanol, which has the following properties [2]:

The solid content of the polymer, wt.%63,0-65,0
PH5,0-5,6
Viscosity, MPa·s250-2000
The proportion of bound styrene, wt.%24
The proportion of monomer, wt.%, no more than0,08
Density, kg/m30,94
The glass transition temperature, °C53

The use of additives Butonal NS 198 for bitumen modification must meet the requirements and standards for polymer-bitumen binders (OST 21.810-98 and GOST 52056-2003).

Sodium pyrophosphate must meet the requirements of GOST 342-77 "Reagents. Nutrifaster 10-water. Technical the conditions".

To improve the ductility of bitumen at low temperatures and increase its strength and water resistance in the process of manufacturing the asphalt mix in it add the granulated material, for the preparation of which the sludge water treatment CHP natural moisture in the number 0,0158-0,0238 wt.%, Portland cement and intensify the process of grinding sodium pyrophosphate are batched together and milled for 30 minutes in a ball mill at a rotation speed of not less than 550 rpm Then dispense a polymer additive and for 15 min to produce a joint grinding at a frequency of not less than 550 rpm during this period, the polymer additive is applied to the mineral part, forming a nanoscale layer of polymer thickness of 7-16 nm. The mixture is then granularit to obtain granules with a size of 2-3 mm

Formulations of asphalt mixtures is given in table 1, and properties of the asphalt compositions of the mixtures in table 1 are given in table 2.

As can be seen from table 2, the composition of the proposed asphalt concrete asphalt concrete mixtures meets the requirements of GOST 31015-2002 physical-mechanical properties, have a higher sdvigoustojchivosti (1,22 of 1.28 times), and water as long videosystem (1.25-1,28 time).

Sources of information

1. GOST 8267-93. Crushed stone and gravel from dense rocks for construction. Technical services is via. With amendments and changes from 01.04.1998, 01.04.2001, 01.07.2002, 01.09.2009. Minsk, 1993. 10 C. (interstate scientific-technical Committee on standardization and technical regulation in construction).

2. Construction Technical Data Sheet. Butonal® NS 198 [Electronic resource]. Mode of access:

http://worldaccount.basf.com/wa/NAFTA~en_US/Catalog/FunctionalPolymers/doc4/BASF/PRD/30095076/pdI?title=Butonal_NS_198_NOV_2009&asset_type=ti/pdf&language=EN&urn=urn:documentum:eCommerce_sol_EU:09007bb28008454a.pdf (accessed 18.12.2012).

Table 1
The components of the mixtureContent, wt.%
Composition
AnalogsThe placeholderDesigned asphalt mixture
RF patent №2190580RF patent №2204539RF patent №2196750
Composition 1Part 2
Oil viscous bitumen5,94-7,355-65,0-6,56,3 6,9
Alkyldimethylammonium chloride0,05-0,15----
Mineral fillerrest----
Mineral powder-3-8---
Fly ash from thermal power plant electrostatic precipitators--10,0-15,0--
Limestone gravel fraction 5-20 mm-35-45---
Granite crushed stone fractions 5-15 mm---67,562,8
VAT residue synthesis of poly is vinylpyrrolidone -0.5 to about 1.75% by weight of bitumen---
The sand fraction up to 5 mm-rest---
Rubber TPR--0,5-1,0--
Tall peck--0,3-0,5--
Screening crushing gravel fraction 0-5 mm--57,0-68,213,517,6
Filler - sludge treatment CHP12,4812,47
Sludge treatment CHP-- -0,01580,0238
Portland---0,00160,00235
Polymer additive Butonal NS 198---0,00240,00357
Sodium pyrophosphate---is 0.00020,00028
Homogeneous karataviense cellulose fiber---0,20,2

Table 2
Name of indicatorThe placeholderThe proposed asphalt mixture
Asphalt concrete mix GOST 31015-2002RF patent №2204539 RF patent №2196750RF patent №2190580
Composition 1Part 2
Strength at 20°C, MPaAt least 2.24,564,372,53,6a 3.9
Strength at 50°C, MPaNot less than 0,65to 2.061,311,061,71,8
Strength at 0°C, MPa-13,0--9,610,2
Sdvigoustojchivosti, MPa (clutch when shifting at 50°C)Not less than 0.18---0,220,23
Fracture strength, MPa (tensile strength to the tensile split at 0°C)2,5-6,0- --2,82,9
Coefficient of resistance as long videosystemNot less than 0,850,750,75-0,950,94
Water saturation1,0 to 4,01,971,15-4,73-0,950,94
Residual porosity, %of 1.5 to 4.52,5--2,12,3
The porosity of the mineral, %15 to 1914,3----
The coefficient frost resistance--0,83-0,9---

ASF is lebetina mixture, containing viscous oil bitumen, filler, sand fractions up to 5 mm, gravel and an additive, characterized in that it contains as crushed granite gravel fractions 5-15 mm, sand - sifting crushing of rocks, filler - sludge treatment CHP and as an additive homogeneous karataviense cellulose fiber and organic modifier containing sludge water treatment, power plant, Portland cement, polymer additive Butonal NS 198 and sodium pyrophosphate, in the following ratio, wt.%:

Oil viscous bitumenfor 6.3 to 6.9
Granite crushed stone fractions 5-15 mm62,8 is 67.5
Screening of crushed rock fraction 0-5 mmof 13.5 to 17.6
Homogeneous karataviense cellulose fiber0,2
Filler - sludge treatment CHP12,47-12,48
Sludge treatment CHP0,0158-0,0238
Portland0,0016-0,00235
Polymer additive Butonal NS 1980,0024-0,00357
Sodium pyrophosphateis 0.0002-0,00028



 

Same patents:

FIELD: chemistry.

SUBSTANCE: bitumen-concrete mixture contains crushed rock, sand and oil bitumen BND 90/130, nano-modified with a mechanically activated mixture of rubber crumbs with an additive, where the bitumen is modified using rubber crumbs with size of 0.25 mm and the additive is natural zeolite, with the following ratio of ingredients, wt %: said bitumen 93.0 of the weight of the rubber-bitumen mixture, said crumbs 7.0 of the weight of the rubber-bitumen mixture, natural zeolite 2.0 of the weight of the rubber crumbs.

EFFECT: high plasticity at subzero temperatures.

1 ex, 6 tbl

FIELD: chemistry.

SUBSTANCE: compound contains oil bitumen BND 60/90, butadiene-styrene polymer DST 30-01, Tamin T4 emulsifier, finely ground mineral filler in form of wet magnetic separation wastes which are ground in advance and water. Components are in the following ratio, wt %: oil bitumen BND 60/90 - 49-51; polymer DST 30-01 - 6; Tamin T4 emulsifier - 2.5; mineral filler - 10-13; water - the balance.

EFFECT: compound has improved physical and mechanical properties such as adhesion to concrete and water-absorption, resistance to a wide range of operating temperatures, as well as low cost of production, which improves the quality and longevity of waterproofing and reduces the cost of maintaining man-made structures.

5 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: binder contains in wt %: deeply oxidised tar - 30-40; high pressure polyethylene - 1.5-3.5; rubber crumb - 1.5-3.5, elementary sulphur - 0.15-0.45; straight run tar - to 100. Obtained binder possesses both high strength properties and sufficient elasticity. Expensive plasticisers are not used, cheaper and more available components are applied in its production.

EFFECT: possibility to extend assortment of binding materials for road construction works, corresponding to the level of main standard requirements to polymer-bitumen binders.

2 tbl

FIELD: chemistry.

SUBSTANCE: binder contains in wt %: deeply oxidised tar - 30-40; high pressure polyethylene - 1.5-3.5; elementary sulphur - 0.15-0.45; straight run tar - to 100. Obtained binder possesses both high strength properties and sufficient elasticity. Expensive plasticisers are not used, cheaper and more available components are applied.

EFFECT: extension of assortment of binding materials for road construction works, corresponding to the level of main standard requirements to polymer-bitumen binders.

2 tbl

FIELD: construction.

SUBSTANCE: method to treat asphalt-concrete road surfaces with an organic solution of a composition of modified bitumen binder, in which treatment is carried out by impregnation of the upper layer of the asphalt-concrete coating with an impregnation composition, such as a composition of a modified bitumen binder containing 30-85 wt % of oil bitumen, 15-20 wt % of oil polymer resin and possibly 0-40 wt % of mineral oil and 0-5 wt % of surfactants, which is used as a solution in an organic dissolvent, having boiling temperature of 155-200°C, used at its weight ratio to the modified bitumen binder, equal to 70/30-50/50, at the same time application of the solution of the modified bitumen binder onto the asphalt-concrete coating is carried out by method of pouring with the norm of consumption of the solution of 0.1-0.4 l/m2 and at the temperature of -6-(+40°C).

EFFECT: low water saturation of treated asphalt-concrete coatings, reduced ageing of coatings, increased coefficient of wheel adhesion to a coating.

6 cl, 3 tbl, 5 ex

FIELD: construction.

SUBSTANCE: asphalt-concrete mix includes as a mineral material the crushed with fraction of 0-5 mm, and the binder is bitumen of grade BND 90/130, and the structuring additive is mechanically activated sapropel. The ratio of components is as follows, wt %: crushed limestone with fraction of 0-5 mm - 93, oil viscous bitumen - 6.3, mechanically activated sapropel - 0.7.

EFFECT: asphalt concrete has improved complex of strength properties.

3 tbl

FIELD: construction.

SUBSTANCE: method to strengthen an asphalt road surface with a carbon nanomaterial includes usage of an asphalt concrete mix containing crushed stone, crushed stone siftings, sand and oil bitumen of "БНД" 90/130 grade. Besides, the oil bitumen is modified by carbon nanotubes in the amount of 0.005% from the bitumen mass, and modification of the oil bitumen with carbon nanotubes is modified under ultrasonic effect.

EFFECT: increased strength and elasticity of a produced asphalt surface, higher water resistance, heat resistance and frost resistance and expansion of temperature range of its laying in the field of negative temperatures.

1 ex

Bitumen plasticiser // 2510409

FIELD: chemistry.

SUBSTANCE: plasticiser is a product of reacting 15.0-15.5 wt % styrene, 2.4-4.0 wt % cyclohexanone peroxide, 3.1-6.0 wt % of 10% cobalt naphthenate solution in styrene and overoxidised bitumen - the balance.

EFFECT: use of the plasticiser enables to obtain bitumen of high quality with improved operational characteristics, particularly improved adhesion, cohesion and elastic properties.

1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to road construction materials, particularly production of bitumen-rubber compositions for road surface binder based on bitumen, and can be used in building, repairing and overhaul repair of road asphalt coatings, as well as in building and repairing bridge floors and overhead crossings. The composition contains bitumen, rubber crumbs made from spent tyres with particle size of up to 1 mm and petroleum oil with viscosity of 0.005-1.6 Pa·s at 60°C. Components are in the following ratio, wt %: rubber crumbs - 8-20, petroleum oil - 2-12, bitumen - the balance. The invention also relates to a method of producing said composition.

EFFECT: product has high adhesion to road surface, high resistance to cracking at low temperatures, improved adhesion at subzero temperatures, high elasticity in heavy traffic conditions.

14 cl, 3 tbl, 24 ex

FIELD: chemistry.

SUBSTANCE: insulation composition contains bitumen, an absorbent, an oxidant and additionally liquid polysiloxane. The oxidant used is saturated iron (III) sulphate solution or concentrated sulphuric acid and/or orthophosphoric acid and/or nitric acid. Content of the components is as follows, wt %: bitumen - 77-75; absorbent - 2-15; liquid polysiloxane - 0.001-0.01; oxidant - the balance. The method of producing the composition involves mixing bitumen and the absorbent while heating to obtain a homogeneous mixture, sprinkling the oxidant, further heating and holding at a temperature required for stabilisation. Before sprinkling the oxidant, liquid polysiloxane is added while mixing bitumen and the absorbent, and sprinkling begins at temperature of 130°C.

EFFECT: avoiding boiling of the reaction mixture and wastage of the end product, which increases output of the product.

4 cl, 1 tbl, 13 ex

FIELD: chemistry.

SUBSTANCE: bitumen-concrete mixture contains crushed rock, sand and oil bitumen BND 90/130, nano-modified with a mechanically activated mixture of rubber crumbs with an additive, where the bitumen is modified using rubber crumbs with size of 0.25 mm and the additive is natural zeolite, with the following ratio of ingredients, wt %: said bitumen 93.0 of the weight of the rubber-bitumen mixture, said crumbs 7.0 of the weight of the rubber-bitumen mixture, natural zeolite 2.0 of the weight of the rubber crumbs.

EFFECT: high plasticity at subzero temperatures.

1 ex, 6 tbl

FIELD: construction.

SUBSTANCE: method for making road concrete mix by mixing heated mineral components, bitumen and an additive using oil sludge differs by the fact that as an additive there used is fine-grained powder obtained by intense mixing of the working agent with oil sludge at their ratio of 1.5:1 with addition of water for complete lime slaking, where the working agent is obtained by mixing of the following components, wt %: animal fat 1-3, adsorbent - thermally treated shells 18-22, unslacked lime ground to 10-3÷10-5 m is the rest at bitumen content of 67-84% of the weight of the above additive, mineral components are heated to 70-90°C, mixture of bitumen with the above additive is up to 90-100°C, and mixing of all mixture components is performed at heating of up to 140-170°C.

EFFECT: enlarging the range of road concrete mixes.

4 ex, 1 tbl

FIELD: construction.

SUBSTANCE: asphalt-concrete mix includes as a mineral material the crushed with fraction of 0-5 mm, and the binder is bitumen of grade BND 90/130, and the structuring additive is mechanically activated sapropel. The ratio of components is as follows, wt %: crushed limestone with fraction of 0-5 mm - 93, oil viscous bitumen - 6.3, mechanically activated sapropel - 0.7.

EFFECT: asphalt concrete has improved complex of strength properties.

3 tbl

FIELD: construction.

SUBSTANCE: in the method to prepare an asphalt-concrete mix by means of mixing of heated mineral components, bitumen and an additive with usage of oil sludge, the additive is a finely dispersed powder, produced intense mixing of a working agent with oil sludge at their ratio of 1.5:1 with addition of water for full lime slaking, treatment of produced product with carbonic acid gas for 10-15 minutes and soaking under tight conditions for 18-30 hr, where the working agent is produced by mixing, wt %: animal fat 1-3, adsorbent produced by pyrolysis of worn car tyres at 850-1100°C with subsequent separation of metal cord and grinding to 10-3÷10-5 m, 18-22, burnt lime ground to 10-3÷10-5 m, balance, with content of bitumen of 66-83% of the mass of the specified additive, mineral components are heated to 70-90°C, the mixture of bitumen with the specified additive - up to 90-100°C, and mixing of all these mixture components is carried out during heating of up to 140-170°C.

EFFECT: improved parameters of an asphalt-concrete mixture by water resistance and water saturation.

1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to road construction and particularly to production of mineral powder for an asphalt concrete mixture. The mineral powder for an asphalt-concrete mixture contains a surfactant, a water repellent agent and a mineral component, the mineral component being carbonate rock powder, the surfactant being a product of treating soap stock by acid-catalysed hydrolysis with an acid number of 100-140 units and the water repellent agent being heavy vacuum tar, with the following ratio of components, wt %: product of treating soap stock 0.7-1.8, heavy vacuum tar 1.0-1.6, mineral component - the balance.

EFFECT: improved water-repellent property of the mineral powder, reduced swelling of the powder and high ultimate strength of the asphalt concrete based thereon.

2 tbl

Mineral powder // 2515274

FIELD: chemistry.

SUBSTANCE: mineral powder for an asphalt concrete mixture, activated by grinding natural material, contains magnesium silicate rock - wehrlite - as the natural material, and grinding is carried out in a rod-shaped vibration apparatus for 13 minutes until achieving the following grain composition, wt %: smaller than 1.25 mm - 100; smaller than 0.315 mm - 94.2; smaller than 0.071 mm - 84.8.

EFFECT: high water resistance.

3 tbl

Mineral powder // 2515239

FIELD: chemistry.

SUBSTANCE: mineral powder for an asphalt concrete mixture, activated by grinding natural material, contains magnesium silicate rock - troctolite - as the natural material, and grinding is carried out in a rod-shaped vibration apparatus for 10 minutes until achieving the following grain composition, wt %: smaller than 1.25 mm - 100; smaller than 0.315 mm - 93.6; smaller than 0.071 mm - 82.2.

EFFECT: high water resistance and adsorption activity.

3 tbl

FIELD: construction.

SUBSTANCE: method to strengthen an asphalt road surface with a carbon nanomaterial includes usage of an asphalt concrete mix containing crushed stone, crushed stone siftings, sand and oil bitumen of "БНД" 90/130 grade. Besides, the oil bitumen is modified by carbon nanotubes in the amount of 0.005% from the bitumen mass, and modification of the oil bitumen with carbon nanotubes is modified under ultrasonic effect.

EFFECT: increased strength and elasticity of a produced asphalt surface, higher water resistance, heat resistance and frost resistance and expansion of temperature range of its laying in the field of negative temperatures.

1 ex

FIELD: construction.

SUBSTANCE: method for production of an asphalt mix, in which the removed asphalt in the form of asphalt crumb and/or new material in the form of grain fillers together or separately are heated and dried in drum plants and then in the mixing plant mixed with bitumen, forming the asphalt mixture suitable for laying. Besides, mixing of heated and dried asphalt crumb and/or grain fillers is carried out in gaseous medium with low oxygen content, oxygen content in which makes maximum of 10%. Drying and heating of asphalt crumb and/or grain fillers is carried out in drum plants with the help of gases with low content of oxygen, which have temperature in the range from 500 to 1000°C, and then moved into the mixing plant. Moving and mixing is also carried out in gaseous medium with low content of oxygen, besides, cold gases are sent into the supply system and into the mixing plant with low oxygen content, which have temperature in the range from approximately 20 to 150°C, or cooled gases with low oxygen content, having temperature in the range from approximately 150 to 300°C, and bunkering of the heated and dried asphalt crumb and/or grainy fillers prior to mixing with bitumen and/or bunkering of finished asphalt mixture is also carried out in the gaseous medium with low oxygen content. Also the device is described for production of asphalt crumb.

EFFECT: possibility to repeatedly use removed asphalt and increased efficiency of asphalt production by saving of raw materials and thermal energy.

28 cl, 12 dwg

FIELD: chemistry.

SUBSTANCE: asphalt-concrete mixture which contains limestone chips with size of 0-5 mm and binder which is modified with a texturing additive, contains bitumen BND 90/130 as the binder, zeolite which is dried at 110°C and mechanically activated to specific surface area of 16.9 m2/g as the texturing additive, with the following ratio of components, wt %: said chips 93, said bitumen 6.3, said zeolite 0.7.

EFFECT: high strength.

3 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to building materials and can be used in applying fire-retardant coatings on building structures. The fire-retardant composition in form of a water-tempered dry mixture for applying coatings is characterised by that it contains, wt %: portland cement 20.0-60.0, expanded vermiculite 10.0-40.0, chrysotile asbestos 5.0-25.0, chamotte 5.0-25.0, expanded pearlite 10.0-30.0, polyfunctional concrete modifier 0.1-1.0, fine water-soluble adhesive 2.0-8.0 and a water-retaining additive 0.1-3.0.

EFFECT: improved crack resistance owing to strain redistribution on the whole material.

2 tbl

Up!