Binding agent for asphalt-concrete mixtures

FIELD: building industry, road building.

SUBSTANCE: invention proposes a binding agent for asphalt-concrete mixtures comprising a modifying agent as an organic binding agent and a filling agent. Agent comprises polyethylene and/or polystyrene waste ground to size 2-5 mm as a modifying agent, and highly dispersed carbonate or oxide powder as a filling agent and sulfur additionally wherein components are taken in the following ratio, wt.-%: bitumen, 30-75; indicated powder, 3-19; polyethylene and/or polystyrene waste, 1-2; sulfur, 20-50. Invention can be used for making road and sidewalk covers, building platforms, industrial object floors and waterproofing materials. Invention provides enhancing strength, waterproofing and reducing water saturation of asphalt-concrete.

EFFECT: improved properties of binding agent.

3 tbl

 

The invention relates to the field of road construction and can be used for preparation of asphalt concrete mixtures in the paving of roads and sidewalks, construction sites, industrial floors, waterproofing.

Known sulfur-containing asphalt mixture (asscr No. 1502520, 04 26/26, 1987) for road pavements, including ash filter sulfur, heat peck, mineral filler, which has a strength at a temperature of 50°2,3-2,7 MPa, swelling of 0.3-0.5% of the volume, water saturation of 2.7-3%.

This material has a narrow scope, as they are bound to the places where the wastes are heat peck and ash sludge sulfur.

Closest to the proposed mix is the binder for road construction bitumen (EN 2123987 C1, C 04 B 26/26, 1998).

The use of sulfur-containing additives in asphalt concrete increases the strength, water resistance, reduction of swelling. However, the transportation of sulfur and sulfur-containing waste to PAR environmentally inappropriate. Therefore, sulfur, and its waste is better to use in a bound state in the form of bitumopodobnaya mixtures, preferably in granular form.

The problem to which the invention is directed, is to increase strength, resistance to water and reducing the water saturation of asphalt.

The solution of this problem is achieved in that the binder for asphalt mixes, including bitumen as an organic binder, a modifier and a filler, contains as a modifier reduced to 2-5 mm waste polyethylene and/or polystyrene, as filler - fine powder of carbonate or oxide of nature and additionally sulfur in the following ratio, wt.%:

bitumen 30-75

powder 3-19

waste polyethylene and/or polystyrene 1-2

sulfur 20-50

Binder for asphalt concrete mixtures are obtained by mixing an organic binder, modifier, filler, sulfur. The mixing of components is carried out in two stages. First mix warmed up to 120-200°With sulfur and mineral filler and a separate bitumen and waste polyethylene and/or polystyrene at temperatures of 120-200°C. Then, a mixture of sulfur with mineral filler add a mixture of bitumen with polyethylene and/or polystyrene, quickly stirred at temperatures of 140-200°and the resulting mixture granularit.

The cooling rate of the granules during granulation must be at least ~1000°/s

THE COMPONENTS THAT MAKE UP THE SULFUR-CONTAINING COMPOSITE.

Sulfur may contain organic impurities up to 5%, minor technical impurities <1 mm to 3%, have a high acidity more than 0,02%, arsenic is missing.

In the quality of fine powder is used, the powder of a carbonaceous nature (limestone, the Dolomites) and oxidic nature (ash, slag), fine Sands or their mixture.

Particle size distribution of powders:

particle size (mm): >0,71<1 - 1%

<0,71>0,05 - 97%

<0.05 to 2%

Bitumen road bitumen grades BND.

Waste polyethylene and/or polystyrene - reduced to 2-5 mm, waste or household waste.

In addition to the mentioned improvement of physico-mechanical properties of asphalt concrete, the use of sulfur-containing composite leads to savings of bitumen, and also allows you to utilize low-grade off-spec sulfur, ash and slag. The granular composite can be used with any serial asphalt plant, adding cold pellets directly into the mixer. All of the above gives a positive effect.

Table 1 shows examples of the sulfur-containing compositions of the composite, in table 2 - characteristics of the composite as a binder, in table 3 - characteristics of asphalt-based composite.

Table 1.
ComponentsComponent content wt% (examples)
 1234
SULFUR20304050
BITUMEN90 635045
POWDER9683
WASTE POLYETHYLENE1 21
WASTE POLYSTYRENE 1 1

Table 2.
PropertiesAstringent examples
1234The placeholder
Penetration at 25°With(100 g, 5)12093652832-220
0°With (200 g, 60 sec)624123356-106
Compliance, cm, at 25° (23°)1001007563(100)
100723820-100
Softening point (Kish, °4856679035-62

Tab the Itza 3.
IndicatorsAsphalt binder on
1234The placeholder
Density t/m323352340236023722410-2430
Swelling vol.%00000
Mixtures wt.%0,820,730,91,20,9-2,4
The limit of compressive strength MPa at °

0
7,88,29,810,76-10,5
205,66,49,110,24,4-3,4
503,64,38,710,20,9-1,2
The ratio of water-stability1110,81

Binder for asphalt mixes, including bitumen as an organic binder, a modifier and a filler, characterized in that it contains as a modifier reduced to 2-5 mm waste polyethylene and/or polystyrene, as filler - visokovci sny powder carbonate or oxide of nature, and optionally sulfur in the following ratio of components, wt. %:

Bitumen 30-75

Powder 3-19

Waste polyethylene and/or polystyrene 1-2

Sulfur 20-50



 

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FIELD: building industry, road building.

SUBSTANCE: invention proposes a binding agent for asphalt-concrete mixtures comprising a modifying agent as an organic binding agent and a filling agent. Agent comprises polyethylene and/or polystyrene waste ground to size 2-5 mm as a modifying agent, and highly dispersed carbonate or oxide powder as a filling agent and sulfur additionally wherein components are taken in the following ratio, wt.-%: bitumen, 30-75; indicated powder, 3-19; polyethylene and/or polystyrene waste, 1-2; sulfur, 20-50. Invention can be used for making road and sidewalk covers, building platforms, industrial object floors and waterproofing materials. Invention provides enhancing strength, waterproofing and reducing water saturation of asphalt-concrete.

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1 cl, 5 ex, 1 tbl

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FIELD: road building materials.

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2 cl, 1 tbl

FIELD: construction of motor car roads.

SUBSTANCE: the invention is pertaining to construction of motor car roads and may be used for the construction of the upper layers of the highway coatings. The technical result of the invention is production of a stabilizing additive in the granular form capable to reduce not only disintegration a macadam-mastic asphalt-concrete mixtures, but also to increase their strength at 50°C (i.e. to improve their heat resistance),the factor of their durable water saturation and a adhesion power of the binder to the mineral materials. The polymeric-reinforcing granular stabilizer for macadam-mastic asphalt-concrete includes the bitumen and the polyamide fibers. At that in the capacity of the polymeric-reinforcing additive it contains the wastes of the pipeline hydro-insulation of ArmPEVA type representing the waste of the bilayered belt of a shrinking material used for insulation of pipes and consisting of a layer of the adhesive active composition of a glue-melt on the basis of an copolymer of ethylene with a vinyl acetate and a layer of the radiation-cross-linked polyethylene treated with electrons and with applied on it of the hot-melt adhesive, and in the capacity of an adhesive use surface-active substance of a cationic type - KADEM_BT, representing the cationic reactant made out of acids of vegetable or animal origin of the fraction of C16-C20 and a polyethylene polyamine at the following components ratio(in mass %): bitumen BND 60/90 - 28.0-38.0, a polyamide fiber - 31.0-35.0, the indicated polymeric-reinforcing additive - 30.0-35.0, the indicated surface-active substance - 1.0-2.0.

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FIELD: building industry; petrochemical industry; the process of production of the stabilizing agents for the macadam-mastic asphalt concrete.

SUBSTANCE: the invention is pertaining to the development of the process of production of the stabilizing agents for the macadam-mastic asphalt concretes used, in particular, at making the highways coatings made on the basis of the macadam-mastic asphalt. The technical result is development of the stabilizing additive for the asphalt concrete produced on the basis of the cheaper components and capable to sorb the binding in the asphalt concrete mixtures, in particular, in the macadam-mastic asphalt concretes at the technological temperatures during storage and transportation of the asphalt concrete mixture produced in the granulated form suitable for transportation and direct injection in the macadam-mastic asphalt concretes on the sites of its application. The stabilizing additive in the form of the granules for the macadam-mastic asphalt concretes contains the organic binding and the structure-forming agent. At that the organic binding is selected from the group including tar, bitumen or bitumen emulsion and in the capacity of the structure-forming agent use the basement lint and-or the lint representing the waste of the cotton production at the following ratio of components in the composition (in mass %): the indicated waste - 60-90, the organic binding - the rest up to 100 %.

EFFECT: the invention ensures production of the stabilizing additive based on the cheaper components and capable to sorb the binding in the macadam-mastic asphalt concretes at the technological temperatures during storage and transportation.

2 cl, 2 tbl

FIELD: building industry; methods of production of the stabilizing additives for the macadam-mastic asphalt-concrete mixtures.

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