RU2611801C1 - Asphalt-concrete mixture - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention refers to technology for production of road-building materials, namely, asphalt-concrete mixtures for construction and repair of motorroads, building of hydrotechnical facilities, civil building. Asphalt-concrete mixture including bitumen, mineral material in the form of carbonate rock of 5-20 mm fraction and carbonate rock sifting of 0-10 mm fraction contains mineral powder, which is a mixture of sludge from chemical water treatment units of enterprises with waste molding mixtures of foundry in ratio 0.1-0.5:1.0, adhesion additive in quantity of 0.3-1.5 wt.% of bitumen weight produced by interaction of vegetable oil phosphatides, polyethylene polyamine, caprolactam in paraffin melt at 160-180°C in ratio 1.0-1.3:0.8-1.0:0.2-0.4:1.0 with subsequent melting of the mixture of above adhesive additive and bitumen at 140-160°C, melt homogenization for 1-2 min, mixing with dry component mixture heated to 130-150°C, with the following component content in the asphalt-concrete mixture, wt.%: bitumen (based on weight of dry component mixture) 4.5-7.0, breakstone of carbonate rock of 5-20 mm fraction 30.0-50.0, mineral powder, i.e. mixture of sludge from chemical water treatment units with waste molding mixtures of foundry in ratio 0.1-0.5:1.0 1.0-10.0, sifting of carbonate rock being the rest.

EFFECT: increased asphalt-concrete density, strength at temperature of +50°C, improved adhesion of bitumen bonding agent to mineral fillers and powder, lowered water saturation of asphalt-concrete mixture.

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Description

The invention relates to a technology for producing road-building materials, namely asphalt concrete mixtures during the construction and repair of roads, the construction of hydraulic structures, in civil engineering.

A known method of producing an asphalt mixture [patent No. 2192399 of the Russian Federation, IPC SB04/26. Asphalt-concrete mixture / Doshlov OI, Belinsky G.A., Gutsalyuk B.N., Balog O.A., Kukharev B.F., Doshlova A.O., Khoroshilova V.A., applicant and patent holder of OJSC “ Irkutskgiprodornii "- No. 2001103600/03; declared 02/09/2002; publ. November 10, 2002].

The specified composition of the asphalt mix is the closest in technical essence and the achieved result and is selected as a prototype, according to which the asphalt mix contains, by weight. %:

bitumen  6.0-6.5 hydrolysis lignin fraction 0-20 mm  3,5-5,0 crushed stone of carbonate rock fractions 5-20 mm  30-35 screenings of carbonate rock  rest

The disadvantage of this asphalt mix is insufficient density and strength at a temperature of + 50 ° C, which negatively affects the quality of the road surface and, accordingly, reduces the standard term of its operation, low adhesion of the asphalt binder to mineral fillers and powder, and a high degree of water saturation of the asphalt mix.

The technical result of the invention is to increase the density of asphalt concrete, strength at a temperature of + 50 ° C, increase the adhesion of bitumen binder to mineral fillers and powder, reduce the degree of water saturation of the asphalt mixture.

The specified result is achieved by the fact that the asphalt mixture, including bitumen, mineral material of carbonate rock of a fraction of 5-20 mm, screening of carbonate rock of a fraction of 0-10 mm, according to the invention contains mineral powder - a mixture of sludge from chemical water treatment plants of used foundry mixtures of foundries in the ratio 0.1-0.5: 1.0, an adhesive additive in an amount of 0.3-1.5% wt. the mass of bitumen obtained by the interaction of phosphatides of vegetable oils, polyethylene polyamine, caprolactam in a paraffin melt at 160-180 ° C in a ratio of 1.0-1.3: 0.8-1.0: 0.2-0.4: 1, 0 with subsequent melting at 140-160 ° C of a mixture of the specified adhesive additive and bitumen, homogenization of the melt for 1-2 minutes, mixing with a dry mixture, heated to 130-150 ° C with the following content of components in the asphalt mix, wt. %:

 bitumen  4,5-7,0 (by weight of the dry mixture of components)  crushed stone of carbonate rock fractions 5-20 mm  30.0-50.0  mineral powder - a mixture of sludge plants chemical water treatment and spent molding foundry mixtures in the ratio of 0.1-0.5: 1.0 1-10  screenings of carbonate rock  rest

As carbonate rock, crushed stone of carbonate rocks is used in accordance with GOST 8267-93, depending on the type of carbonate rocks mined in this region:

- dolomite limestone,

- limestone

- calcareous dolomite,

- dolomite.

According to the invention, limestone crushed stone is used in the Kovrovsky quarry of the Vladimir Region, corresponding to GOST 8267-93, with a fraction of 5-20 mm, grade M _600-800 in strength, and screening is used for crushing the crushed stone with a fraction of 0-10 mm.

The compositions of the asphalt mixture are shown in table. one.

The invention is as follows.

Example 1

To prepare a sample of mineral components in an amount of 5000 g, pre-warmed up in a drying cabinet at a temperature of 130 ° C are mixed until the components of the mixture are completely removed from moisture in the following quantities, g:

 crushed stone of carbonate rock fractions 5-20 mm  2500 (5000 × 50/100 = 2500)  mineral powder-mixture of sludge plants chemical water treatment and spent molding foundry mixtures in a ratio of 0.1: 1.0 500 (5000 × 10/100 = 500)  screening of carbonate rock fraction 0-10 mm  2000 (5000 × 40/100 = 2000)

As crushed stone of carbonate rock, limestone crushed stone (GOST 8267-93) of the Kovrovsky quarry in the Vladimir region is used. a fraction of 5-20 mm of the brand for strength M ₆₀₀ . As a screening use screening crushing specified crushed stone fraction of 0-10 mm

Mixing of the components is carried out for 2-3 minutes manually or through a laboratory mixer.

To prepare the required quantities of bitumen and an adhesive additive, a weighed portion of bitumen in an amount of 225 g (4.5% wt. By weight of the dry mixture) is taken and an adhesive additive in an amount of 0.3% wt. by weight of bitumen (225 × 0.3 / 100 = 0.675 g) obtained by the interaction of vegetable oil phosphatides, polyethylene polyamine, caprolactam in a paraffin melt with a ratio of components of 1.0: 0.8: 0.2: 1.0 at 160 ° C followed by mixing the indicated amounts of bitumen and an adhesive additive, melting at a temperature of 140 ° C, then the melt is homogenized for 1-2 minutes and added with vigorous stirring to the prepared dry mixture heated to 130 ° C according to the above composition of the components. Total weight of the asphalt mix: 5000 g (dry mix) +225 g (bitumen) +0.675 g (adhesive admixture) = 5225.675 g.

Example 2

To prepare a sample of mineral components in an amount of 5000 g, preheated in an oven at a temperature of 140 ° C are mixed to completely remove moisture in the following components, g:

 crushed stone of carbonate rock fractions 5-20 mm  2000 (5000 × 40/100 = 2000)  mineral powder-mixture of sludge plants chemical water treatment and spent molding foundry mixtures in the ratio of 0.3: 1.0  250 (5000 × 5/100 = 250)  screening of carbonate rock fraction 0-10 mm  2750 (5000 × 55/100 = 2750)

As crushed stone of carbonate rock, limestone crushed stone (GOST 8267-93) of the Kovrovsky quarry in the Vladimir region is used. a fraction of 5-20 mm of the brand for strength M ₇₀₀ . As a screening use screening crushing specified crushed stone fraction of 0-10 mm

Mixing of the components is carried out for 2-3 minutes manually or through a laboratory mixer.

To prepare the necessary quantities of bitumen and an adhesive additive, a weighed portion of bitumen is taken in an amount of 300 g (6.0% by weight of the dry mix) and an adhesive additive of 3.0 g (1.0% by weight of bitumen) is added to it, obtained by the interaction of phosphates of vegetable oils, polyethylene polyamine, caprolactam in a paraffin melt with a ratio of components of 1.2: 0.9: 0.3: 1.0 at 170 ° C, followed by mixing the indicated amounts of bitumen and an adhesive additive, melting at a temperature of 150 ° C , then the melt is homogenized for 1-2 minutes and added at vigorous stirring in the prepared dry mixture heated to 140 ° C according to the above composition of the components. Total weight of the asphalt mix:

5000 g (dry mix) +300 g (bitumen) +3.0 g (adhesive additive) = 5300.3 g

Example 3

To prepare a sample of mineral components in an amount of 5000 g, the components of the mixture preheated in an oven at a temperature of 150 ° C are mixed until the moisture is completely removed in the following amounts, g:

 crushed stone of carbonate rock fractions 5-20 mm  1500 (5000 × 30/100 = 1500)  mineral powder-mixture of sludge plants chemical water treatment and spent molding foundry mixtures in a ratio of 0.5: 1.0  fifty (5000 × 1/100 = 50)  screening of carbonate rock fraction 0-10 mm  3450 (5000 × 69/100 = 3450)

As crushed stone of carbonate rock, limestone crushed stone (GOST 8267-93) of the Kovrovsky quarry in the Vladimir region is used. fraction of 5-20 mm of the brand for strength M ₈₀₀ . As a screening use screening crushing specified crushed stone fraction of 0-10 mm

Mixing of the components is carried out for 2-3 minutes manually or through a laboratory mixer.

To prepare the required amount of bitumen, a weighed amount of 350 g is taken (7.0% by weight of the dry mix) and an adhesive additive is added to it - 5.25 g (1.5% by weight of bitumen) obtained by the interaction of plant phosphatides oils, polyethylene polyamine, caprolactam in a paraffin melt at a component ratio of 1.3: 1.0: 0.4: 1.0, at 180 ° C, then the mixture of bitumen with an adhesive additive is melted at a temperature of 160 ° C, the melt is homogenized for 1 -2 min and added with vigorous stirring to the cooked dry warmed up to 150 ° C Referring composition according to the above components. Total weight of the asphalt mix:

5000 g (dry mix) +350 g (bitumen) + 5.25 g (adhesive additive) = 5355, 25 g

The test results of examples 1-3 and the prototype are shown in table 2.

Compression strength tests of the material were carried out according to GOST 9128-2013.

From the table it is seen that the resulting asphalt mixture in terms of quality indicators exceeds the prototype in all examples 1-3.

A significant advantage of the present invention compared with the prototype is the ability to use industrial raw materials as industrial raw materials for asphalt mixes, which are sludge from chemical water treatment plants of industrial enterprises, used foundry mixtures of foundries. Their use significantly reduces the cost of manufacturing asphalt concrete and can improve the environmental situation in industrial areas, reduce the area of landfills for technogenic waste.

The use of a previously unknown adhesive additive obtained by the interaction of vegetable oil phosphatides, polyethylene polyamine, caprolactam in a paraffin melt allows to achieve a high degree of adhesion of the asphalt binder to mineral fillers and powder, to increase the density and hydrophobicity of the resulting asphalt concrete, which significantly improves its quality. In aggregate, these factors determine an increase in the service life of asphalt concrete pavement, an increase in its strength at a temperature of + 50 ° C, which is especially important in the spring-summer period, when the loads on the road surface reach maximum values.

Claims (2)

Asphalt-concrete mixture, including bitumen, mineral material in the form of carbonate rock fraction of 5-20 mm and screening of carbonate rock fraction of 0-10 mm, characterized in that it contains mineral powder - a mixture of sludge from chemical water treatment plants with waste molding mixtures of foundries in the ratio of 0, 1-0.5: 1.0, an adhesive additive in an amount of 0.3-1.5% wt. the mass of bitumen obtained by the interaction of phosphatides of vegetable oils, polyethylene polyamine, caprolactam in a paraffin melt at 160-180 ° C in a ratio of 1.0-1.3: 0.8-1.0: 0.2-0.4: 1, 0 with subsequent melting at 140-160 ° C of a mixture of the specified adhesive additive and bitumen, homogenization of the melt for 1-2 minutes, mixing with a dry mixture of components heated to 130-150 ° C, with the following components in the asphalt mixture, wt. %:  bitumen (by weight of the dry mixture of components) 4,5-7,0  crushed stone of carbonate rock fractions 5-20 mm 30.0-50.0  mineral powder - a mixture of sludge plants  chemical water treatment and spent molding mixtures foundries in the ratio of 0.1-0.5: 1.0 1.0-10.0  screenings of carbonate rock rest