KR20010025392A - Additive for paving a road from the stone mastic asphalt and its granule preparation method - Google Patents

Abstract

PURPOSE: An additive for wrapping asphalt concrete with flow resistance or drainability and its granule preparation method by having inorganic material, water soluble polymer, lower alcohol, and the like are provided. Thereby, flow resistant or drainable additive for wrapping asphalt concrete is simply and uniformly produced without causing any damage to the device for its production and uniformly mixed in practical use, and the adhesive force between asphalt and aggregate is also increased. CONSTITUTION: An additive used for wrapping asphalt with flow resistance or drainability is characterized by consisting of 10-100 pts.wt. of mineral powder, 0.2-20 pts.wt. of water soluble polymer, 10-100 pts.wt. of lower alcohol having less than 4 numbers of carbon and 5-20 pts.wt. of water, based on the 100 pts.wt. of cellulose fiber. The manufacturing method for the additive granule includes the following steps of: storing cellulose single yarn produced by grinding and melting natural pulp, recycled paper or disposed paper in a first cellulose fiber storage tank(3); storing measured mineral powder in a mineral powder tank(10); storing measured aqueous solution produced by dissolving water soluble polymer in lower alcohol or water, in aqueous solution storage tank(8); mixing micro-cellulose single yarn, mineral powder, aqueous solution in a double paddle mixer(5) and delivering to a second cellulose fiber storage tank(14); delivering the mixture in the second cellulose fiber storage tank to a pellet machine by screw conveyor(15) and pelletizing; drying the formed pellet in a cold chamber(18), while collecting dust by using cyclone(25), and; delivering the dried pellet to storage chamber and packaging into a certain unit.

Description

Additive for paving a road from the stone mastic asphalt and its granule preparation method}

The present invention relates to a flow-resistant or drainable asphalt concrete pavement additives and granules manufacturing method thereof, more specifically, 10 to 100 parts by weight of inorganic powder, 0.2 to 20 parts by weight of water-soluble polymer, 4 carbon atoms with respect to 100 parts by weight of cellulose fibers. It is composed of 10 to 100 parts by weight of the lower alcohol or 5 to 20 parts by weight of water, pulverized and spun natural pulp, recycled paper or waste paper to produce fine cellulose short fibers to store in a first cellulose fiber storage tank; Separately measuring the inorganic powder and storing in the inorganic powder measuring tank; Measuring an aqueous solution in which a water-soluble polymer is dissolved in lower alcohol or water and storing the aqueous solution in an aqueous storage tank; Mixing fine cellulose short fibers, inorganic powder and an aqueous solution in which water-soluble polymers are dissolved in lower alcohol or water in a double paddle mixer, and transferring them to a second cellulose fiber storage tank for storage; Transferring the mixture from the second cellulose fiber storage tank to a pellet machine using a screw conveyor and shaping it into pellets using the pellet machine; Drying the molded pellets in a cooling chamber while collecting dust generated by using a cyclone and drying the dust; The present invention relates to a flow-resistant or drainable asphalt concrete pavement and a granule manufacturing method thereof, wherein the dried pellets are transferred to a storage tank and packed in a predetermined unit. In order to prevent the flow of asphalt, cellulose fibers with many voids were selected and used.In addition, it prevents the flow of asphalt during the production, transportation, and installation of the flow-resistant or drainable asphalt concrete mixture. As part of the asphalt binder, to achieve the effect of enhancing the durability of the mixture against aging, moisture penetration and enhancing fatigue resistance.

The shear resistance of conventional pavement asphalt pavement depends on the friction between the aggregates and the viscosity of the asphalt binder rather than on the aggregates of the aggregates. In addition to the deterioration of ride comfort, increased risks of traffic accidents and traffic congestion due to maintenance have caused significant inconvenience for road users.

In particular, pavement roads in urban areas with high temperatures and heavy traffic due to high temperature in asphalt pavement due to high temperature in summer are easily deformed due to severe plastic deformation, which leads to loss of pavement. It's growing seriously.

In other words, asphalt exhibits brittleness at low temperatures, causing cracks, and plastic deformations at high temperatures, causing plastic deformation, and increasing the amount of logistics due to the improvement of national living standards and industrial development. As the number of logs is expanded, cracks and plastic deformation are further promoted due to the increase of traffic volume and weight of the vehicle body, thereby shortening the life of the asphalt pavement.

In order to solve the problems as described above, a variety of researches for improving the characteristics of asphalt have been actively conducted in recent years.

As a method for reforming asphalt, various methods are known, but Korean Patent Publication Nos. 95-3393, 94-702908, 94-7121, Japanese Patent Laid-Open Nos. 52-105925, and 51-63819, As described in So 56-93757, So 56-98262, So 50-84622, So 49-98418, U.S. Patent Nos. 3,853,799, 3,992,341, 4,240,946, 5,039,342, 5,037,474, etc. Likewise, a method of modifying asphalt using polymers is known to be the most preferable from a theoretical or economical point of view.

However, the method of modifying the asphalt as described above not only has a limitation in the modification effect, but also a problem peculiar to the general asphalt pavement method, that is, a limit of resistance to plastic deformation at high and heavy vehicle conditions, crack generation at low temperatures and aggregates. There are many problems such as desorption of phenomena, smooth surface texture, low frictional resistance, formation of road reflection and water film in rainy weather, noise, high wear and durability, and low dynamic stability.

In addition, such modified asphalt concrete is known to be not suitable to be treated and recycled as industrial waste because it is modified at the end of its life.

In order to solve this problem, many methods have been researched and developed, but the most effective methods known to date are known as SMA (Stone Mastic Asphalt).

Flow-resistant or drainable asphalt concrete pavement method is an asphalt concrete pavement method that is used worldwide in Germany, Europe, and the United States, etc., in order to improve the flow resistance and durability of asphalt pavement, and to optimize the particle size characteristics of aggregates rather than asphalt binders. Compared to the general asphalt pavement method, a large amount of coarse aggregate is used, and asphalt, crushed sand, filler and cellulose fiber are used as a binder to fill the aggregate and aggregate, and these binders (mastic) It acts as a paste that combines aggregate with aggregate.

However, in implementing the flow-resistant or drainage asphalt concrete pavement method, since a large amount of coarse aggregate of about 5 to 13 mm is used in a large amount of 70% or more, a large amount of asphalt flows down and cellulose fibers and other additives are used to improve this problem. Developing and applying precisely manufactured granules to a certain ratio can provide good fiber dispersion and prevention of asphalt dripping. However, if cellulose fiber is incorrectly manufactured, it will stick to the storage tank due to sun exposure of the storage tank. Soon, it will interfere with automatic metering, and if only cellulose fiber is added, the cellulose fiber will not be dispersed well in the ascon mixture, so it will not be a uniform mixture. As a result, asphalt will flow down and aggregates will desorb. The effect of the degree that there is Can not be obtained.

Therefore, the object of the present invention is to be used in the flow resistance or drainage asphalt concrete pavement method not only to increase the adhesion of asphalt and aggregate, but also easy to manufacture, does not cause damage to the device, requires less energy during manufacturing, uniformity It is to provide a flow-resistant or drainable asphalt concrete pavement additive and granule manufacturing method thereof, which can obtain a quality product and have an effect of homogeneous mixing even in practical application.

In order to achieve the above object as well as other objects easily expressed in the present invention, 10 to 100 parts by weight of inorganic powder, 0.2 to 20 parts by weight of water-soluble polymer, 10 to 100 parts by weight of lower alcohol having 4 or less carbon atoms, based on 100 parts by weight of cellulose fiber. 5 to 20 parts by weight of water or water, and natural pulp, recycled paper or waste paper, pulverized and sponged to produce fine cellulose short fibers to store in a first cellulose fiber storage tank; Separately measuring the inorganic powder and storing in the inorganic powder measuring tank; Measuring an aqueous solution in which a water-soluble polymer is dissolved in lower alcohol or water and storing the aqueous solution in an aqueous storage tank; Mixing fine cellulose short fibers, inorganic powders, lower alcohols, or aqueous solutions in which water-soluble polymers are dissolved in a double paddle mixer, and transferring them to a second cellulose fiber storage tank for storage; Transferring the mixture from the second cellulose fiber storage tank to a pellet machine using a screw conveyor and molding into pellets; Drying the molded pellets in a cooling chamber while collecting dust generated by using a cyclone and drying the dust; It is a method of transporting dried pellets to storage tanks and packing them in certain units to manufacture additives for pavement resistance or drainage of asphalt concrete. In the manufacturing process, less energy is used, a product of uniform quality can be obtained, and even in actual application, it is easy to weigh and input, and it is well dispersed, so that a homogeneous mixing effect can be obtained.

1 is a granule manufacturing process of the flow resistance or drainage asphalt concrete pavement additives according to the present invention,

Figure 2 is a flow showing the granules manufacturing process of the flow-resistant or drainage asphalt concrete pavement additive according to the present invention,

3 is a partially cutaway perspective view of a pellet machine of the apparatus according to the invention.

* Explanation of symbols for the main parts of the drawings.

1.Hammer crusher 2, 13. Turbo fan

3. First Cellulose Fiber Storage Tank

4, 15. Screw conveyor

5. Double paddle mixer

6. Aqueous solution main storage tank 7. Aqueous pump

8. Aqueous Storage Tank 9. Pump

10. Mineral Powder Storage Tank 11.Inorganic Powder Storage Tank

12. Mineral Powder Transporter 14. Second Cellulose Fiber Storage Tank

16. Turning chute

17. Sus mesh conveyor

18. Cooling Room (Drying Room) 19. Fan

20. Bucket elevator

21. reservoir 22. rotary valve

23. Turbo Fan 24. Bag Filter

25. Cyclone 30. Pellet machine

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a manufacturing process chart of the flow-resistant or drainage asphalt concrete pavement additive according to the present invention, Figure 2 is a flow showing the manufacturing process of the flow-resistant or drainage asphalt concrete pavement additive according to the invention, Figure 3 Partially cutaway perspective view of a pellet machine in the apparatus.

The flow-resistant or drainable asphalt concrete pavement additive according to the present invention is 10 to 100 parts by weight of inorganic powder, 0.2 to 20 parts by weight of water-soluble polymer, 10 to 100 parts by weight of lower alcohol having 4 or less carbon atoms or 100 parts by weight of cellulose fiber. It is characterized by consisting of 20 to 20 parts by weight.

The cellulose fiber of the present invention is extruded by increasing the specific gravity to 0.2 to 0.8 by pelletizing the specific gravity of about 0.02 to 0.04.

The cellulose fiber of the present invention is made of fine cellulose short fibers by mechanical processing such as natural pulp, recycled paper, or waste paper, which is pulverized and sponged dry using a hammer crusher or the like. The length of the cellulose short fibers at this time is 0.01 to 8 mm, the thickness is 7 to 80 μm, the weight average length thereof is 1.5 to 3 mm, and the average thickness is 35 μm.

Inorganic powders contain moisture in the air, but the aggregates are mixed at high temperatures (150 to 180 ° C) during the production of flow-resistant or drainable asphalt concrete mixtures. In particular, Na-bentonite or diatomaceous earth is preferable as a molding aid to increase the specific gravity of the granulated cellulose fibers to facilitate the automatic metering and easy addition during the production of flow resistance or drainage asphalt concrete mixtures. Inorganic powder is added to increase the adhesiveness, flowability and dispersibility of the initial pelletization, and after pelletizing it increases the specific gravity of the pelletized cellulose fibers to facilitate mixing and dispersing into the flow-resistant or drainable asphalt concrete mixture, and automatic Make weighing and feeding easy.

The water soluble polymer, as a binder, imparts tackiness to the pelletized additives of the present invention and provides bonding to the pellets. The water-soluble polymer binds the pelletized cellulose fibers with a binder but is water-soluble, and after being mixed into a flow-resistant or drainable asphalt concrete mixture, it is dissolved by the high temperature (150-180 ° C.) of the mixture to lose binding strength and flow resistance or It is included in the drainable asphalt concrete mixture, and the cellulose fibers bound by the water soluble polymer are freely movable into the flow resistant or drainable asphalt concrete mixture and are uniformly dispersed.

The water-soluble polymer is not particularly limited but is preferably selected from the group consisting of polyvinyl alcohol, polyethylene glycol or polyacrylamide.

Lower alcohols having 4 or less carbon atoms are used as the solvent of the water-soluble polymer, and methanol, ethanol, isopropanol and the like are preferable. In particular, the use of such an alcohol as a solvent can solve the problem that the pelletized cellulose fibers may not be dispersed and aggregated when mixed with the flow resistant or drainable asphalt concrete pavement composite composition. This also solves the problem of sticking the pellets produced by curing the water-soluble polymer in a short time due to rapid evaporation of alcohol after pelletization. If water is used as a solvent without using alcohol, it is not preferable because the pellet may be hardened like a lump due to the high pressure during extrusion. Confirmed.

Therefore, a high evaporation rate and a solvent capable of dissolving the water-soluble polymer are preferable. Ethanol is most preferable in consideration of economical aspects and environmental aspects after volatilization, and water is most effective in consideration of economic aspects.

The flow-resistant or drainage asphalt concrete pavement additive of the present invention configured as described above is manufactured by the following method.

That is, the manufacturing method of the flow-resistant or drainage asphalt concrete pavement additive according to the present invention is a step of pulverizing and spun natural pulp, recycled paper or waste paper to produce fine cellulose short fibers to store in the first cellulose fiber storage tank; Separately measuring the inorganic powder and storing in the inorganic powder measuring tank; Measuring an aqueous solution in which a water-soluble polymer is dissolved in lower alcohol or water and storing the aqueous solution in an aqueous storage tank; Mixing fine cellulose short fibers, inorganic powders, lower alcohols, or aqueous solutions in which water-soluble polymers are dissolved in water in a double paddle mixer, and transferring them to a second cellulose fiber storage tank for storage; Transferring the mixture from the second cellulose fiber storage tank to the pellet machine in a predetermined amount using a screw conveyor and molding into pellets; Drying the molded pellets in a cooling chamber while collecting dust generated by using a cyclone and drying the dust; It consists of the process of transporting the dried pellets to the storage tank and packing in a predetermined unit.

First, the natural pulp, recycled paper or waste paper is pulverized and spun dry using a hammer crusher (1) at 400 kg / HR pressure and transferred to a first cellulose fiber storage tank (3) using a turbo fan (2) for storage. do.

Separately, water-soluble polymers and those dissolved in lower alcohols having 4 or less carbon atoms or those dissolved in water are stored in an aqueous solution main storage tank 6 which is intermittently or repeatedly stirred, and the inorganic powders are stored using the inorganic powder transporter 12. Store in the tank (10).

Next, the cellulose short fibers stored in the first cellulose fiber storage tank 3, an aqueous solution of a water-soluble polymer stored in the aqueous solution main storage tank 6, a lower alcohol aqueous solution having 4 or less carbon atoms or a water-soluble polymer, and inorganic powder storage. The inorganic powder stored in the tank 10 is mixed in the double paddle mixer 5, but the cellulose short fibers are used by the screw cow conveyor 4, and an aqueous solution of a water-soluble polymer and a lower alcohol solution having 4 or less carbon atoms or a water-soluble polymer. The silver aqueous solution is transferred from the main storage tank (6) to the aqueous solution storage tank (8) using an aqueous solution pump (7), and then mixed in such a manner that the pump (9) is evenly sprayed onto the double paddle mixer (5) through the nozzle. The inorganic powder is weighed through the inorganic powder metering tank 11 and transferred to the double paddle mixer 5 to be mixed.

The mixture mixed in the double paddle mixer 5 is transferred to the second storage tank 14 using the turbo fan 13, and then pelleted into the pellet machine using the screw conveyor 15 and the turning cut 16. 30) to a certain amount to be pelletized.

In this case, when the mixture is transferred to the second storage tank 14, unmixed short cellulose fibers or inorganic powder is scattered by the turbo fan 13, and the dust is collected into the bag filter 24 using the turbo fan 23.

The pellet machine 30 used in the present invention includes an injection hole 301 into which the mixture is injected from the second storage tank 14, and a pan grinder roller for extruding the injected mixture into the through hole of the die 302; 303), a scraper 304 for detaching the mixture adhering to the surface of the roller, a die 302 for extruded and molded mixture, a cutting device 305 for cutting and pelletizing the extruded mixture to a certain size, It consists of a discharge port 306 for discharging pellets, a gear 307 and a main bearing 308 that rotates so that the molded pellet can be discharged to the discharge port 306, the mixture injected into the inlet to the grinder roller 303 The additive of the present invention is produced in the form of pellets by being extruded into the through hole of the die 302 and cut into a predetermined size.

In this case, the thickness of the die 302 of the pellet machine 30 is 30 to 60 mm, which is to allow the die 302 to withstand the pressure of the pan grinder roller 303 and the material of the die 302. It is effective to make silver alloy steel of high strength.

However, if the through holes are formed to the thickness of the die 302, the granules of the pelletized cellulose fibers are dispersed, and the length of the holes through which the cellulose fibers are pelletized should not be more than 30 mm. The part where the cellulose fiber mixture flows in and out by the grinder roller 303 is preferably manufactured in a tapered shape to facilitate the extrusion. In addition, the through hole is effective in terms of dispersion of the pellets produced, the ease of manufacture of the pellets, and the like, having a diameter of 5 to 8 mm.

The flowable or drainable asphalt concrete pavement additive of the present invention pelletized by the pellet machine 30 is cooled and dried in the cooling chamber 18, stored in the storage tank 21 by the bucket elevator 20, and then rotary Packaged while being measured by a predetermined amount by the valve 22 is produced as a finished product.

At this time, the heat and dust generated in the cooling chamber 18 is absorbed through the fan 23 and purified by the cyclone 25 itself, and then released into the atmosphere.

As described above, the present invention comprises 10 to 100 parts by weight of inorganic powder, 0.2 to 20 parts by weight of water-soluble polymer, 10 to 100 parts by weight of lower alcohol having 4 or less carbon atoms or 5 to 20 parts by weight of water, based on 100 parts by weight of cellulose fibers. Ground, natural pulp, recycled paper or waste paper to pulverize and sponge to produce fine cellulose short fibers to store in a first cellulose fiber storage tank; Separately measuring the inorganic powder and storing in the inorganic powder measuring tank; Measuring an aqueous solution in which a water-soluble polymer is dissolved in lower alcohol or water and storing the aqueous solution in an aqueous storage tank; Mixing fine cellulose short fibers, inorganic powders, lower alcohols, or aqueous solutions in which water-soluble polymers are dissolved in a double paddle mixer, and transferring them to a second cellulose fiber storage tank for storage; Transferring the mixture from the second cellulose fiber storage tank to a pellet machine using a screw conveyor and molding into pellets; Drying the molded pellets in a cooling chamber while collecting dust generated by using a cyclone and drying the dust; It is a method of transporting dried pellets to storage tanks and packing them in certain units to manufacture additives for pavement resistance or drainage of asphalt concrete. In the manufacturing process, less energy is used, a product of uniform quality can be obtained, and even in actual application, it is easy to weigh and input, and it is well dispersed, so that a homogeneous mixing effect can be obtained.

Claims (9)

10 to 100 parts by weight of inorganic powder, 0.2 to 20 parts by weight of water-soluble polymer, 10 to 100 parts by weight of lower alcohol having 4 or less carbon atoms or 5 to 20 parts by weight of water, based on 100 parts by weight of cellulose fibers, or Additives for paving drainage asphalt concrete. [Claim 2] The additive for pavement or drainage of asphalt concrete according to claim 1, wherein the cellulose fiber is made of fine cellulose short fibers by mechanical processing of dry pulp, recycled paper or waste paper. The fine cellulose short fibers have a length of 0.01 to 8 mm, a thickness of 7 to 80 μm, their weight average length is 1.5 to 3 mm, and an average thickness of 35 μm. Asphalt concrete pavement additives. The additive for pavement or drainage of asphalt concrete according to claim 1, wherein the inorganic powder is Na-bentonite or diatomaceous earth. The additive of claim 1, wherein the water-soluble polymer is selected from the group consisting of polyvinyl alcohol, polyethylene glycol, or polyacrylamide. The additive for pavement or drainage of asphalt concrete according to claim 1, wherein the lower alcohol having 4 or less carbon atoms is methanol, ethanol or isopropanol. Pulverizing and sponging natural pulp, recycled paper or waste paper to produce fine cellulose short fibers and storing them in a first cellulose fiber storage tank; Separately storing the inorganic powder in a mineral powder tank; Measuring an aqueous solution in which a water-soluble polymer is dissolved in lower alcohol or water and storing the aqueous solution in an aqueous storage tank; Mixing fine cellulose short fibers, inorganic powder and an aqueous solution in which water-soluble polymers are dissolved in lower alcohol or water in a double paddle mixer, and transferring them to a second cellulose fiber storage tank for storage; Transferring the mixture from the second cellulose fiber storage tank to a pellet machine using a screw conveyor to a certain amount and molding the mixture into pellets; Drying the molded pellets in a cooling chamber while collecting dust generated by using a cyclone and drying the dust; Method for producing a flow-resistant or drainage asphalt concrete pavement additive, characterized in that consisting of the step of transferring the dried pellets to the storage tank and packaging in a predetermined unit. 8. The method of claim 7, wherein the fine cellulose short fibers have a specific gravity of about 0.02 to 0.04. 8. The method of claim 7, wherein the pellet has a specific gravity of 0.2 to 0.8.