RU2447225C2 - Method for renosphalt road concrete mix making - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: to produce a mix, the initial material consisting of crushed stone and grinding screenings is dried separately, the crushed stone and the grinding screenings are separately heated up to the required temperature in one drying drum, and sent to hoppers via a separator for storage of the crushed stone, the grinding screenings and dust. Hoppers are equipped with heat exchangers to cool the material down to the temperature of 20-60°C with subsequent transfer of the rejected heat into an accumulator with its subsequent use for preliminary heating of initial materials. The cooled down crushed stone and grinding screenings are sent to intermediate hoppers with subsequent dosing, dust is dosed separately. Cooled crushed stone, grinding screenings and dust are mixed with a dosed binder, where a binder is a stabilising binder containing bitumen, diesel fuel and a gelling additive made of distilled tall oil and caustic soda, in the ratio of wt %: tall oil 85-90, caustic soda 10-15 at the following ratio in the stabilised binder, wt %: bitumen - 82-85; diesel fuel 15-18; gelling additive 1-2 with adhesive additive, and then the finished mix is packed.

EFFECT: increased operational reliability.

1 dwg

Description

The invention relates to the repair of asphalt concrete coatings, namely the production of building materials.

A known method of preparing an asphalt concrete mixture (RF patent No. 2186746), including heating and separating the aggregates into fractions, mixing the heated bituminous binder with a large aggregate fraction, the subsequent introduction of a small fraction of aggregate and mineral powder, before applying the heated bituminous binder, the large aggregate fraction is treated with a diluent until complete enveloping him.

Separation of aggregates is carried out by a boundary grain of 5 mm.

As a diluent, oil tar or fuel oil is used.

The disadvantage of this method is the low quality of asphalt due to insufficient homogeneity of the mixture.

A known method for the preparation of asphalt concrete (RF patent No. 2340721), which consists in the fact that the components of the asphalt concrete are fed into a drying drum, where the material is dried, after which the material is fed to screens for separation into fractions, which are fed into the hopper of the hot material in the proper sequence, a weighing hopper, then into a mixing device connected to a bitumen dispenser, and the vaporized gases enter the dust collecting system, which are mixed with the bulk of the components of the asphalt concrete. Crushed stone of fractions 5-10, 20-30 and 20-40 mm, natural shelf sand, mineral powder, crushing screenings, bitumen are prepared, and batching and drying of mineral materials is carried out. Mineral materials are classified and re-dosed, binders are mixed and dosed at the same time, after which the operation of intermediate storage of the obtained material is performed, then preliminary dosing of the asphalt concrete components is carried out and the material is fed into the drying drum. The components of the mixtures are uniformly mixed at the maximum possible enveloping of mineral materials with a layer of a binder component, and discrete portions of hot bitumen are supplied to mix it with the asphalt mixture, and then the finished asphalt mixture is unloaded from the storage hopper into the vehicles.

The disadvantages of this method include the multi-stage process for the preparation of asphalt concrete mix, low information content of the process, which does not provide high technological performance in the production of asphalt concrete.

Closest to the proposed invention relating to a method for the preparation of cold asphalt mixtures, is the method according to the application of the Russian Federation 94015568.

The method is as follows. The initial loose stone materials are fed into separate drying drums, where they are heated to the required temperature, then transported to storage bins, dosed and fed to the mixing compartment, where they are mixed with mineral powder and bitumen.

However, this method has the following disadvantages: the temperature of the resulting mixture at the outlet of the mixer> 120 ° C, which leads to emission and separation of the mixture.

After preparation, the finished mixture must be cooled to a temperature of at least 60 ° C by stirring it in air, while the mixture segregates and evaporates the diluents introduced into the stabilized binder, which will lead to a decrease in the quality of the asphalt concrete mixture, and to deterioration of the environmental conditions of production.

The present invention solves the problem of improving the quality of asphalt mixtures, improving the environmental conditions of production, reducing energy and metal consumption of equipment, increasing production stability. Improving the quality of asphalt mixtures is ensured by separate drying and storage of mineral materials, providing the necessary temperature mixing 40-70 ° C and the use of a stabilized binder. Improving environmental conditions is ensured by separate drying, in which emissions and fuel consumption are reduced, and the temperature of the resulting mixture is 40-70 ° C.

The reduction in energy intensity occurs due to the sequential heating and drying of mineral materials with the utilization of heat obtained from the cooling of heated mineral materials through heat exchangers for subsequent heating of raw materials and other production purposes.

The reduction in metal consumption is ensured by the use for separate heating and drying of one drying drum without additional pre-metering bins.

Stability of production is achieved by separation of the processes of preliminary drying, heating of mineral materials and mixing of components. To obtain such a technical result, in the proposed method for producing asphalt concrete mixes Renosphalt, separate heating of the initial mineral materials, transportation to storage bins with subsequent mixing with mineral material and a stabilized binder are used. Distinctive features of the proposed method are that the source material, consisting of crushed stone and crushing screenings, is dried separately, crushed stone and crushing screenings are separately heated to the desired temperature in one drying drum and sent through a separator to the hopper for storing crushed stone, screenings of crushing and dust, equipped with heat exchangers for cooling the material to a temperature of 20-60 ° C with subsequent transfer of the selected heat to the battery for further use in preheating the starting materials, for it cooled rubble crushing and screening is directed into an intermediate hopper, followed by dosing dust dosed separately; then the chilled rubble is mixed, the crushing screenings and dust are dispensed with a metered binder, where a stabilized binder consisting of bitumen, diesel fuel and a gel-forming additive consisting of distilled melt oil and caustic soda is used as a binder in the ratio, wt.%: melt oil 85-90, caustic soda 10-15 in the following ratio in a stabilized binder, wt.%: Bitumen - 82-85; diesel fuel 15-18; gelling additive 1-2 with an adhesive additive, and then the finished mixture is packaged.

The use of a stabilized binder according to the patent of the Russian Federation No. 2354622 "Gel-forming binder for the preparation of cold asphalt repair mixtures" increases the durability, strength and shear resistance of the repaired asphalt concrete coating.

The implementation of the claimed invention ensures the achievement of its main objectives:

- increase the efficiency of the process;

- the ability to create cold asphalt mixtures with a high binder content, providing a stable internal structure of bitumen, increased film thickness on the mineral aggregate and resistance to aging.

In the drawing - a flow chart for implementing the proposed method for the preparation of asphalt concrete mixtures Renosphalt:

1. crushed stone warehouse

2. crushing screening warehouse

3. heat exchanger

4. hopper with adjustable material feed

5. dryer drum

6. Separator flows of crushed stone and screening crushing

7. crushed stone storage bin

8. crushing screening hopper

9. dust storage bin

10. receiving heat exchanger for cooling mineral materials

11. crushed stone intermediate hopper

12. intermediate hopper for screening crushing

13. dust dispenser

14. dispenser of crushed stone and screening crushing

15. stabilized binder dispenser

16. the capacity of the finished stabilized binder

17. stirrer

18. ready-mixed hopper

19. heat accumulator

20. other consumers

Example:

From the warehouses 1 and 1 equipped with a heat exchanger 3, crushed stone or crushing screenings are separately supplied to the pre-batching hopper 4. Separate crushed stone or crushing screenings from the hopper 4 are carried out at a specific speed to the drying drum 5. The crushed stone and crushing screenings are dried in drum 5 with selection of dust and its accumulation in the hopper 9. Crushed stone or screening crushing from the drying drum 5 through the flow separator 6 is fed into the hopper 7 and 8, respectively. Crushed stone, crushing elimination, dust in the bins 7, 8, 9 are cooled by means of heat extraction through heat exchangers 10 with heat removal to the heat accumulator 19 for further use in heat exchangers 3 and for other purposes. Crushed stone and crushing screenings from storage bins 7, 8 are transported to intermediate bins 11, 12, respectively. Crushed stone and crushing screenings are dosed on a weight batcher 14. Dust dosage is carried out on a weight batcher 13. In a container 16, the stabilized binder is brought to a temperature of 60-90 ° C and fed to batcher 15. Crushed stone, crushing screenings and dust from batchers 14 and 13 are fed into the mixer 17 and there is served a stabilized binder from the dispenser 15. Mixing of mineral materials with a binder in the mixer 17 is carried out for 20-120 seconds. The finished mixture is transported to the storage hopper 18 with its subsequent packaging.

Information sources

1. RF patent 2186746, С04В 26/26. The method of preparation of the asphalt mix / Mogunov V.V., application No. 2001106259, published 2002.08.10, priority 2001.03.05.

2. RF patent 2340721, Е01С 19/10. The method of preparation of asphalt / Lavsky S.N., application 2007116923, published 2008.12.10, priority 2007.05.04.

3. RF application 94015568, Е01С 19/10. The method of preparation of asphalt mixtures, Talovsky VN, published 1995.12.27, filing date 1994.04.27.

4. RF patent 2354622, С04В 26/26. Gel-forming binder for the preparation of cold asphalt repair mixtures / Egorov SA, Rachenko AF, Sirotkin EG, Karpova OI, Venik VN, Bazuev VP, Chuprikov EN Application 2007107566 published 2008.09.10, priority 2007.02.28.

Claims (1)

A method of preparing asphalt mixtures, including separate heating of the starting mineral materials in drying drums, transportation to the storage hopper, dosing and mixing with mineral powder and bitumen, characterized in that the starting material, consisting of crushed stone and crushing screening, is dried separately, crushed stone and crushing screening separately heated to the desired temperature in one drying drum and sent through a separator to the hoppers for storing crushed stone, screening crushing and dust, equipped with heat exchangers for cooling the material to a temperature of 20-60 ° C, followed by transfer of the selected heat to the battery with its further use for preheating the starting materials and other purposes, then the cooled crushed stone and crushing screenings are sent to intermediate bins with subsequent dosing, the dust is dosed separately; then they mix the cooled crushed stone, elimination of crushing and dust with a metered binder, where a stabilized binder consisting of bitumen, diesel fuel and a gel-forming additive consisting of distilled melt oil and caustic soda is used as a binder in the ratio, wt.%: melt oil 85 -90, caustic soda 10-15, with the following ratio in a stabilized binder, wt.%: Bitumen - 82-85; diesel fuel - 15-18; gelling additive - 1-2 with an adhesive additive, and then the finished mixture is packaged.

Images