SU1747419A1 - Method of producing asphalt-concrete mix - Google Patents

Abstract

Use: road construction, preparation and storage of asphalt mixes on viscous bitumens. The essence of the invention: heated rubble, sand and bitumen are mixed, then it is introduced into the mixture for aggregation 8-10% by weight. paste mineral powder containing 25-30 May. % water. The caking of the mixture after storage is 6-8 shocks. Before laying with, the mixture is heated and thoroughly mixed until the water is removed. 3 tab.

Description

WITH

increases the cost of the process. In addition, the known method requires the installation of closed ponds to maintain the asphalt concrete mix, which is not environmentally friendly and adversely affects the surrounding environment. The purpose of the invention is to simplify and speed up the preparation of the asphalt concrete mix.

Heated mineral components of coarse fractions, crushed stone, sand are fed to the mixer, heated bitumen is fed, then mixed. After that, the resulting mixture is aggregated by mixing it with 8-10% by weight of paste powder containing 25-30 May. % water.

The addition of a mineral powder in the form of a paste containing water to the mixture of bitumen with sand and crushed stone helps to cool the mixture and to aggregate it, that is, it promotes the loosening of the mixture.

For example, a asphalt concrete mixture of the following composition was prepared, wt%: Crushed stone of a fraction of 15-35 mm 20 Crushed stone of a fraction of 0-15 mm20

Asbestos waste fraction 0.5-35 mm60

Bitumen BND 130/2005

Then a paste of mineral powder and water was added to the thoroughly mixed mixture.

The composition of the paste, wt.%: Lime mineral powder 70 Water 30 The amount of paste-like mineral powder in the mixture from the mineral part was 8 wt.%.

After the addition of a paste of mineral powder and zoda mixture thoroughly mixed.

P r and m 6 p 2. Prepared asphalt mixture composition, wt.%:

Crushed stone of fraction 5-20 mm40

Sand crushed fraction 2.5 mm60

Bitumen BND 90/1306

and carefully stir the mixture. Then, paste of lime mineral powder containing 25% by weight of water was added and mixed thoroughly.

The test results of the initial asphalt mixture and after its aggregation with a paste from mineral powder are given in Table. 1 and 2. Table 3 shows the example of J with a paste content of 10%. as well as more or less of the claimed limit.

Before laying the asphalt concrete mixture is heated, mixing thoroughly until complete removal (evaporation) of water.

In this case, the powder structures free bitumen, which is outside the sphere of action of the surface grains of rubble and sand, a more perfect distribution of the binder is achieved, which increases the strength

system.

The described method of preparing the asphalt mix without deteriorating the quality of the mix,. significantly simplifies and speeds up the process of preparing a mixture, without the need for an additional aggregation operation, of special equipment. The aggregation is performed simultaneously with the production of asphalt concrete in the same technological process on

standard equipment.

Wetting the mineral powder with water to form a paste from them reduces the loss of powdered powder.

Claims (1)

Invention Formula A method of making asphalt concrete mixture, which includes mixing crushed stone, sand, mineral powder and bitumen, aggregation and storage of the mixture, characterized in that. what. in order to simplify and speed up the preparation of the asphalt concrete mixture, first mix crushed stone, sand and bitumen, then the resulting mixture aggregated by mixing it with 8-10 wt.% paste-like mineral powder containing 25-30 wt.% water. Indicator Density, g / cm Water saturation. % Swelling,% porosity,% residual porosity,% Strength at compressed at Coefficient Water Resistance Caking. number of strokes Indicator The initial mixture of composition, May. %: crushed stone, fr. 15-35 mm 20 crushed stone, fr. 0.15 20 asbestos waste, fr. 0.5-35 mm 60 bctumBND90 / 1305 Density, g / e Water saturation. % Swelling,% porosity,% residual porosity,% Strength at compressed., Kg / cm Co. Water resistance Table 1 Value indicator Aggregated mix with paste from miner, powder, containing 25 may. % water; the amount of pasta is 8 May. % of the miner, parts 2.44 2.34 3.00 3.25 0.18 0.12 16.60 14.00 2.75 2.90 46.70 34.40 0.86 0.85 more than 12 table 2 Value indicator Aggregated paste mixture from miner, powder, containing 30 mWe % water; the amount of pasta is 8 May. % of the miner, parts 2.49 2.40 4.85 3.80 1.02 1.07 13.00 11.00 1.2 0.8 34.00 56.20 0.87 0.90 more than 12 Table 3 The invention relates to road construction, in particular, to methods for preparing and storing asphalt mixes, and can be used in the construction of road and airfield pavements. A known method of preparation and temporary storage in the storage bin of hot asphalt concrete mixtures on viscous bitumens. The disadvantage of the known method is the necessity to deliver the prepared mixture to the construction object immediately after preparation. The storage of such mixtures in a cooled state is impossible due to the violation of performance and caking of the mixture, which leads to the limitation of the use of such mixtures. mixtures at sites remote from the cooking site. A known method of preparing asphalt concrete mixture on viscous bitumen, in which the heated mineral components are mixed with heated viscous bitumen, then the resulting asphalt concrete mixture is aggregated by passing through a chain conveyor system with water washing and subsequent storage in water or in air at ambient temperature below 0 °. A disadvantage of the known method of preparing an asphalt concrete mixture suitable for long-term storage is the need for an additional special aggregation device, which further complicates and significantly