Asphalt concrete mix

 

The invention relates to the field of road construction materials. Effect: reduction of consumption of bitumen and increase tyre grip wheels vehicle with the road surface. Asphalt mixture comprises a bitumen, a mineral filler in the form of fractions of gravel 5-10 and 10-20 mm cubic form schebenok sand with particles of cubic forms faction 0,315-5 mm, as a mineral powder is the fraction of the crushing of gravel 0-0,315 mm and additionally activated mineral powder in the following mass ratios, wt.%: bitumen 3,94-4,13; fractions of crushed rock with cubic shape schebenok 5-10 mm 21,3-32,0, fractions 10-20 mm 32,0-51,80; the fraction of sand with particles of cubic shape 0,315-5.0 mm 13,5-29,7; the fraction of the crushing of gravel 0-0,315 mm 0,86-1,96; activated mineral powder 3,84-7,73. 6 table.

The invention relates to the field of road construction materials can be used for construction of road and airfield pavements.

Famous mix asphalt, including asphalt binder, lime, mineral powder, gravel fractions of 3-15 mm and sand when the mass ratio of components, %: tar 5-5,5, slaked lime 1-2, minm binder consumption (tar) and mineral powder, which significantly increases the cost of the produced asphalt. In addition, the asphalt coating on the basis of these materials is characterized by a low coefficient of adhesion of the tires of cars with the surface and this increases the likelihood of accidents on the roads.

Known asphalt mixture containing, wt.%: asphalt binder (tar oil - 8-9%), the spent etching solution files 0,8-1,9, mineral filler (granite screenings fraction up to 5 mm) rest /2/.

The disadvantage of this method is associated with high consumption of oil bitumen (tar) - up to 9%. In addition, the solution from the etching of the files contains up to 29% hydrochloric acid and various chlorides, which increases the probability of formation of acid drainage from the road surface.

The proposed asphalt mixture containing the bitumen BND 90/130 (6.3 to 8.5 wt.%), mineral filler (limestone grits, particles less than 5 mm 75,5 of 91.7 wt.%), activated mineral powder 2-16 wt.% /3/.

The disadvantage of this method of producing asphalt concrete is the high consumption of bitumen (up to 8.5 wt.%).

Known asphalt mixture /4/, which contains, wt%: bitumen 5-6, slag mineral powder 3-7,5, and mineral on the tuma (up 6%).

The proposed asphalt mixture /5/ adopted us for the prototype. It includes bitumen, crushed stone fractions, mm: 5-10, 10-20 cubic form separate schebenok the sand fraction 0,315-5.0 mm and mineral powder fraction 0-0,315 mm

The disadvantages of the known asphalt mix are the high consumption of bitumen and low-grip tires wheels cars from the road surface. This is because in the prototype /5/ use fractions of crushed stone with cubic form separate schebenok and sand, no particles of cubic form. It is not possible to create a dense packing of gravel and mineral filler (sand) road construction, resulting in increased consumption of bitumen for void filling.

The objective of the proposed technical solution is the reduction of consumption (bitumen) and the increase of the coefficient of adhesion of the tires of the wheels of the vehicles with the road surface.

This problem is solved due to the fact that asphalt mixture containing bitumen, a mineral filler in the form of fractions of gravel 5-10 and 10-20 mm cubic form separate schebenok the sand fraction 0,315-5 mm, mineral powder fraction 0-0,315 mm, contains crushed rock with cubic shape schebenok sand with chemicalelement mineral powder in the following mass ratios of the components, wt.%:

Bitumen 3,94-4,13

Fractions of crushed rock with cubic shape

schebenok mm

5-10 21,30-32,00

10-20 32,0-51,80

The fraction of sand with particles of cubic shape, mm

0,315-5,0 13,50-29,70

The fraction of the crushing gravel, mm

0-0,315 0,86-1,96

Activated mineral powder 3,84-7,73

As a binder used bitumen grade BND 60/90 in the number of 3.94-4,13 wt.%

At the present time upon receipt of asphalt mixes usually use crushed rock with cubic shape individual schebenok /5/ and the sand plate (flakiness), needle-shaped and sharp-angled forms, which, on the one hand, significantly increases the consumption of bitumen for the production of asphalt concrete (due to its loose packing), and on the other reduces the friction of the tires of the vehicle with the road surface, since the surface of contact of the tires with insufficient surface due to the absence of her micro - and macrosegregation layers, providing high traction tires and wheels with mikroteksturoy cover /6/.

To increase the grip of the tires of car wheels with the road surface it is treated with special preparations, for example a mixture of sand with chlorides of alkali and alkaline earth metals and phosphogypsum /7 the AI pavement.

To reduce consumption of bitumen in obtaining asphalt, increase of friction of the road with the tires of the wheels of the vehicle and lowering the operating costs of the road and the probability of emergency situations at us it is proposed to use as mineral filler in the composition of the asphalt concrete crushed stone fractions 5-10 and 10-20 mm cubic form schebenok and sand 0,315-5.0 mm with particles of cubic form.

The use of fractions of crushed rock with cubic shape schebenok and sand with particles of cubic forms under certain mass ratios and their fractions allows to achieve a more dense packing (packing) mineral fillers of the road surface and to reduce the consumption of bitumen, to increase macro - and microroughness layers of wear of the road surface and the tyre grip of the wheels to the surface.

The quality of asphalt is determined by the mass ratio of the fractions of gravel 5-10 and 10-20 mm cubic form schebenok and sand 0,315-5.0 mm with particles of cubic form.

Reducing the amount of sand fractions 0,315-5.0 mm in a mixture of at least 13.5 wt.% it is undesirable, since it increases the consumption of bitumen for the preparation of asphalt concrete. The increase in the number of the population tyre wheel cars with the road surface.

A decrease of the fraction of gravel 5-10 mm in the mixture below 21.3 wt.% reduces the density of the paving and increases the flow of bitumen, and increasing the amount of this fraction more of 32.0 wt.% also leads to an increase in consumption of bitumen due to a less dense packing of mineral filler in asphalt. With a fraction of crushed stone fractions 10-20 mm in the mixture below 32,0 wt.% increased consumption of bitumen and decreases the friction of the tires of car wheels with the road surface. When the number of crushed stone fractions 10-20 mm cubic form schebenok in the above mixture of 51.0 wt.% increased consumption of bitumen upon receipt of the asphalt.

In the examples to obtain asphalt mixes used different numbers of fractions of gravel 5-10 and 10-20 mm cubic form schebenok and sand 0,315-5.0 mm with particles of cubic form.

Fractions 5-10 and 10-20 mm cubic form schebenok and sand fractions 0,315-5.0 mm with cube-shaped particles made from materials Berezovsky career JSC "Taro" and Nizhny-Tagil pit administration "Valerin Bor on crushing the centrifugal type crushing and held their dust.

Grain composition of fractions 5-10 and 10-20 mm cubic form schebenok and sand fractie crushing and screening, used in a mixture in the amount of 0,86 is 1.96 wt.% with the aim of obtaining a dense asphalt concrete and some reduction of consumption of bitumen. The grain composition of the fractions of screenings from crushing gravel 0-0,315 mm are given in table 4.

As the activated mineral powder used powdered activated limestone Bogdanowitsch field. The Sverdlovsk region. Characterization of activated mineral powder are shown in table 5. Its consumption in the mixture is 3.84-7,73 wt.% The addition of active mineral powder improves the adhesion of bitumen to the mineral filler, the density and order packaging asphalt concrete pavement.

On the above mineral fillers prepare five asphalt mixtures, the composition and properties of which are listed in table 6. Table 6 shows that the physico-chemical properties of the asphalt of the proposed structure meets the requirements of TU 218 of the RSFSR 601-88 on asphalt concrete pavement type EP, SP and MP, and the grip of the tyres of the car wheels and the road surface exceeds the value of coupling in analog /4/ and THAT 218 of the RSFSR 601-88 for grades SP and MP. The cost of production of asphalt concrete according to the proposed method significantly lower the index of the grip of the tyres of the wheels with the surface of the coating reduces the likelihood of accidents on the roads.

Literature

1. Auth. mon. The USSR №885391, E 01 7/18, published. 30.11.1981.

2. Auth. mon. The USSR №1551693, published. 23.03.1990.

3. Auth. mon. THE USSR №1248966, 04 26/26, 04 18/12, BI NO. 29, 1986.

4. Auth. mon. The USSR №1204601. 04 IN 26/26, 18/14, 08 L 95/00, BI NO. 2, 1986.

5. Rublev I. A. Asphalt concrete, M.: Higher school, 1969, 398 S., S. 13-17.

6. Panina L., Theoretical aspects of surface coatings. Sat. the scientific. proceedings of the OPS of the Russian state road research Institute. M., 1992, vol.5, S. 50-56.

7. Auth. mon. The USSR №1498780, M CL409 K 3/18, BI NO. 29, 1989.

8. Auth. mon. The USSR №779490, E 01 7/32 STRANDED, BI No. 42, S. 157.

Claims

Mix asphalt, including asphalt, mineral filler in the form of fractions of gravel 5-10 and 10-20 mm cubic form separate schebenok the sand fraction 0,315-5 mm, mineral powder fraction 0-0,315 mm, characterized in that it contains crushed rock with cubic shape schebenok sand with particles of cubic form, as a powder mineral - fraction of the crushing of rubble and additionally activated mineral powder in the following mass ratios, wt.%:

Bitumen 3,94-4,13

Fractions of crushed rock with cubic shape schebenok mm:

5-10 21,3-32,0

10-20 32,0-51,8

The fraction of sand with particles of cubic shape mm:

0,315-5,0 13,5-29,7


 

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