EA038569B1 - Bitumen-concrete mix - Google Patents

Abstract

The invention relates to the field of construction materials, in particular, to road construction materials containing texturing agents, and can be used for the preparation of porous bitumen-concrete mixes used for the arrangement of bases for III-IV category motor roads in climatic areas I-IV, and for floors in service premises. The bitumen-concrete mix contains, wt.%: crushed stone - 35.0-70.0; bitumen - 2.5-6.0; wastes of built-in bituminous roofing, crushed 1 to 15 mm, containing 20 to 80% of viscous bitumen - 1-10; natural sand - the balance. Roofing felt is used as wastes of built-in bituminous roofing. The proposed bitumen-concrete mix features enhanced physical and mechanical characteristics, lower prime cost due to a high rate of use of wastes of built-in bituminous roofing, the recycling of which considerably contributes to the mitigation of environmental damage.

Description

The invention relates to the field of building materials, in particular building road materials containing structuring additives, and can be used in the preparation of asphalt concrete mixtures used for the foundation of highways of III-IV categories in I-IV climatic zones, as well as floors in office premises.

Known asphalt concrete mixture containing crushed stone, bitumen, a structuring additive, which is used as activated sapropel. (1)

The disadvantage of the known asphalt concrete mixture is its low physical and mechanical characteristics, the method of producing the asphalt concrete mixture is complex, lengthy and costly.

The closest to the proposed asphalt concrete mixture is a porous and highly porous asphalt concrete mixture for the lower layers of coatings, containing, wt%: crushed stone of fraction 20-40 - 25-31; crushed stone of fraction 5-20 - 25-29; sand from rock crushing screenings - 16.5-23.9; bitumen BND 60/90 - 3.55.0; rubber crumb - 0.4-0.8 and secondary linear polyethylene, low density - 0.1-0.3 were used as a structuring additive; sand is the rest. (2)

The disadvantage of this invention is low physical and mechanical performance with a minimum reduction in environmental damage due to waste disposal.

The objective of the claimed invention is to obtain porous fine-grained and coarse-grained asphalt concrete mixtures with improved physical and mechanical characteristics and lower cost due to the high percentage of use of soft roof repair waste, the utilization of which greatly contributes to the reduction of environmental damage.

The problem is solved by using the proposed asphalt mixture containing, wt%: crushed stone - 35.0-70.0; bitumen - 2.5-6.0; waste of soft roof repair, crushed from 1 to 15 mm, containing from 20 to 80% of viscous bitumen - 1-10; natural sand - the rest.

Usually waste roofing material is used.

Granulometric composition of the mineral part (non-combustible residue) of the wastes of the soft roof (roofing material): ________________________________________________________

Fraction, mm 1.25 0.63 0.315 0.16 0.071 <0.071 Parts, remainder,% 0-4 3-11 29-37 19-27 7-18 18-26

A feature of the proposed porous asphalt concrete mixture is the introduction into its composition as a structuring additive from 1 to 10 wt.% Crushed from 1 to 15 mm of soft roof repair waste containing from 20 to 80% of viscous bitumen, which determines the percentage of its constituent parts. components. At the same time, such a physical and mechanical property of the presented asphalt concrete mixture, such as compressive strength, increases. By rejecting the use of screening rock crushing, reducing the amount of bitumen, as well as increasing the percentage of use of waste from repairing a soft roof, the cost of the proposed asphalt concrete mixture is reduced and a large amount of waste from repairing a soft roof is utilized, which reduces environmental damage.

Shredding of wastes from repairing soft roofs to the specified sizes can be carried out in an electromechanical crushing plant of the MD BKM type with a capacity of 450 kg / h, manufactured by RABIKA LLC, Naberezhnye Chelny.

The crushing plant contains a chamber with a rotor with steel knives, equipped with a receiving and unloading hopper and a rotary sieve with cells from 5 to 10 mm.

Pieces of soft roof repair waste, 40x100 mm roofing material, pre-cut with a guillotine, are loaded by 10-15 kg through the receiving hopper into the chamber, where the soft roof repair waste is crushed and the construction bitumen is separated from the cardboard base. Through the unloading hopper, the crushed waste from the repair of the soft roof is directed to a rotary sieve to separate the bitumen powder from the cardboard. Bituminous crumbs spilled through the cells are packed into bags and sent for further use. A separate technological line prepares the initial components, where crushed stone and sand are heated to 170 ° C and mixed, then cold bitumen chips obtained as a result of crushing the soft roof waste are fed and mixed for 3-5 minutes. Then bitumen is added and further mixing of the entire mass occurs until lumpiness and heterogeneity are removed. The resulting asphalt concrete mixture is unloaded into dump trucks to be sent to the site.

Were made five model compositions of the proposed porous asphalt mixture (see compositions in table. 1).

The advantages of the proposed asphalt mixture are shown in table. 2.

- 1 038569

Compositions of asphalt concrete mixtures

Table 1

Components used COMPOSITION # 1 # 2 No. 3 # 4 # 5 Crushed stone 25 35 45 70 75 Bitumen 2.0 2.5 4 6 7.5 Waste of soft roof, crushed from 1 to 15 mm, containing from 20 to 80% viscous bitumen 0.5 1.0 7 ten 11.5 Natural sand 72.5 61.5 44 fourteen 6-3

Test results of asphalt concrete mixtures

table 2

P / p No. Physical and mechanical indications patent No. 2500636 composition No. 1 composition No. 2 composition No. 3 composition No. 4 composition No. 5 1 Water saturation% by volume 6.8 6.9 7.0 7.2 7.5 9.1 2 Compressive strength at 50 ° C 1.38 3.12 4.15 4.22 4.51 4.60 3 Water resistance coefficient 0.88 0.87 0.87 0.86 0.83 0.80

As you can see from the table. 2, the composition of the asphalt concrete mixture given in the claims has increased ultimate compressive strength.

Sources of information

1. Patent RU No. 2515840

2. Patent RU No. 2500636

Claims (2)

CLAIM 1. An asphalt-concrete mixture containing crushed stone, bitumen, sand, binders, characterized in that the waste of roof repairs, crushed from 1 to 15 mm, containing from 20 to 80% of viscous bitumen with the following ratio of components, wt.% Is used as an organic binder : crushed stone 35.0-70.0; bitumen - 2.5-6.0; waste of soft roof repair, crushed from 1 to 15 mm, containing from 20 to 80% of viscous bitumen - 1-10; natural sand - the rest. 2. An asphalt-concrete mixture according to claim 1, characterized in that roofing material is used as a waste of repairing a soft roof.