KR20210073656A - Ascon additives for high durability asphalt concrete, method for manufacturing thereof, and ascon composition comprising the same - Google Patents

Abstract

The present invention provides an ASCON additive capable of improving the durability of asphalt concrete, a manufacturing method thereof and an ASCON composition comprising the same. More specifically, the present invention provides an ASCON additive comprising a ferronickel slag/waste plastic complex including waste plastics and ferronickel slag, a manufacturing method thereof and an ASCON composition comprising the same.

Description

Ascon additives for high durability asphalt concrete, manufacturing method thereof, and ascon composition comprising the same

The present invention relates to an asphalt concrete additive for improving durability of asphalt concrete, a manufacturing method thereof, and an asphalt concrete composition comprising the same.

Ascon (asphalt concrete) used for asphalt road, the main component is aggregate (gravel), asphalt is 5 to 10% by weight, the role of asphalt is to be coated on the aggregate to make the aggregate adhere to each other to form an asphalt road. There are two types of asphalt: general asphalt, which is a refined petroleum product, and modified asphalt. The modified asphalt contains polymers and various additives to improve durability. However, while the modified asphalt has excellent performance, it has a disadvantage that the price is 2-3 times higher than that of general asphalt.

Modifiers for improving asphalt durability can be broadly divided into surfactants and polymers. Surfactant modifiers lower the surface tension of asphalt to improve mixability with aggregates, and polymer-based modifiers have the effect of improving cohesion of roads by bonding between aggregates. The types of polymer-based modifiers include thermoplastic resins, thermosetting resins, and rubber. Typical examples are Styrene Butadiene Rubber (SBR), Styrene Butadiene Styrene (SBS), Ethylene vinylacetate, EVA. ), polyethylene (PE), polypropylene (Polypropylene, PP), polyethylene terephthalate (PET), epoxy resin, urethane resin, acrylic resin, phenol resin, etc.

On the other hand, there have been many attempts to use the waste plastic as an asphalt additive due to the environmental problem caused by the waste plastic. In Korea, waste plastic recycling granules (small grain powder) are made from waste plastics, and waste plastic fibers are extracted from them and mixed with asphalt pavement. At this time, the durability and lifespan of roads (asphalt) are maximized by maximizing the interlocking effect between waste plastic fibers and aggregates. There is a case of increasing the price (Korean Patent Registration No. 1871413), but there were many difficulties in commercialization due to the complicated process and low price competitiveness. Overseas, there is a technology (PCT Publication No. 2017/129962) for mixing waste plastic with additives, processing it into pellets, mixing it with asphalt, melting it, and mixing aggregate with it to produce final asphalt concrete (PCT Publication No. 2017/129962), The dissolution time of the waste plastic in the asphalt is long, and the specific gravity of the waste plastic is low, so that it floats to the surface layer of the road when the road is being laid, and is separated and cannot serve as a modifier.

Therefore, there is still a need to develop a technology capable of improving the durability of asphalt concrete by using waste plastics and being economically and uniformly mixed in asphalt concrete.

The present invention provides an asphalt concrete additive capable of improving the durability of asphalt concrete, a manufacturing method thereof, and an asphalt concrete composition comprising the same.

In one aspect of the present invention, the present invention is to provide an asphalt concrete additive comprising a ferronickel slag/waste plastic composite including waste plastic and ferronickel slag particles.

In another aspect of the present invention, the present invention comprises the steps of forming a functional group on the surface of the waste plastic by treating the waste plastic with an electron beam or plasma; heating the ferronickel slag; and spraying the waste plastic onto the surface of the ferronickel slag to form a ferronickel slag/waste plastic composite.

In another aspect of the present invention, the present invention is an asphalt concrete additive of the present invention; asphalt; And to provide an asphalt concrete composition comprising the aggregate.

The asphalt concrete additive of the present invention increases the cohesive force and bonding force between the asphalt and the aggregate, so that even if moisture penetrates the asphalt concrete, it is possible to prevent the aggregate from falling off, thereby improving the durability of the asphalt concrete. Furthermore, it is possible to prevent the drop-off of the aggregate as described above, thereby preventing the pothole of the asphalt road.

1 schematically shows a process in which a porthole is generated in conventional asphalt concrete.
Figure 2 schematically shows the asphalt concrete formed by the asphalt concrete composition of the present invention.
Figure 3 schematically shows the manufacturing process of asphalt concrete prepared by the asphalt concrete composition containing the asphalt concrete additive of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiment of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below.

In the present invention, asphalt concrete is an abbreviation for asphalt concrete, and asphalt concrete and asphalt concrete have the same meaning.

The present invention provides an asphalt concrete additive capable of producing an asphalt concrete with improved durability so that the drop-off of the aggregate as shown in FIG. 1 does not occur.

In detail, the present invention may provide an asphalt concrete additive comprising a ferronickel slag/waste plastic composite including waste plastic and ferronickel slag particles.

The waste plastic may have a functional group formed by plasma or electron beam, and the functional group may be a hydroxyl group or a carboxyl group, but is not limited thereto.

The waste plastic in which the functional group is formed can serve to bond the ferronickel slag and the asphalt, and the functional group can improve the adhesion between the asphalt, so that the durability of the asphalt concrete formed by the asphalt concrete composition of the present invention can be significantly improved. can

Furthermore, the ferronickel slag/waste plastic composite may be in a form in which the waste plastic is coated with the surface of the ferronickel slag, and the waste plastic may be attached to the surface of the ferronickel slag due to a functional group formed in the waste plastic have. For example, 80 to 90% of the used waste plastic may be located on the surface of the ferronickel slag.

Based on the total weight of the ferronickel slag/waste plastic composite, the waste plastic may be 5 to 10% by weight, for example, the ferronickel slag may be 95% by weight, and the waste plastic may be 5% by weight .

When the content of the waste plastic is less than 5% by weight, the adhesive component capable of bonding between the aggregates is insufficient, so the effect of improving the durability of asphalt concrete is insignificant, and when the content of the waste plastic exceeds 10% by weight, ferronickel slag Uncoated components may be present in the composition to improve the viscosity of the asphalt concrete composition, thereby inhibiting the flowability of the asphalt concrete composition.

Furthermore, the waste plastic may have a particle diameter of 0.1 to 3 mm, but is not limited thereto, and any type of waste plastic may be used as long as it has a size that can be uniformly coated on the surface of the ferronickel slag.

The waste plastic of the present invention includes waste vinyl, and the waste plastic may be a waste plastic including at least one selected from the group consisting of polystyrene, polycarbonate, polypropylene and polyethylene, but is not limited thereto.

In addition, the ferronickel slag may have a particle diameter of 0.1 to 6 mm, preferably 0.1 to 3 mm. If the particle diameter of the ferronickel slag is less than 0.1mm, there may be a problem that the coating of the waste plastic itself becomes difficult, and if it exceeds 6mm, it becomes difficult for the ferronickel slag/waste plastic composite to be positioned between the aggregates. It becomes difficult to perform the role of binding.

The ferronickel slag may be obtained from molten steelmaking slag generated during the steelmaking process of an ironworks. The waste plastic in which the functional group is formed comes into contact with the heated ferronickel slag while being heated above its melting point, so that it can be easily coated on the surface of the ferronickel slag.

On the other hand, the present invention provides a method for preparing an asphalt concrete additive.

Specifically, the present invention comprises the steps of forming a functional group on the surface of the waste plastic by treating the waste plastic with an electron beam or plasma; heating the ferronickel slag; and spraying the waste plastic onto the surface of the ferronickel slag to form a ferronickel slag/waste plastic composite.

The electron beam may be irradiated for 5 minutes to 10 minutes at 15 to 25 kGy, and the plasma may perform the step of forming a functional group on the surface of the waste plastic through plasma using a gas such as oxygen with an output of 200 to 300 W. have.

Furthermore, the ferronickel slag may be heated before being coated with the waste plastic having functional groups formed thereon. At this time, the heating may be performed simultaneously with rotation after loading the ferronickel slag into the cylindrical coating machine, and may be performed at a temperature of 160 to 180°C. If the temperature is less than 160 ℃, the waste plastic may not be uniformly fused to the surface of the ferronickel slag, and if it exceeds 180 ℃, the waste plastic is thermally decomposed or it takes a long time to cool after being coated on the ferronickel slag may occur.

Furthermore, the present invention may provide an asphalt concrete composition comprising the asphalt concrete additive of the present invention.

Specifically, the asphalt concrete additive of the present invention; asphalt; And it may provide an asphalt concrete composition comprising an aggregate.

The asphalt concrete composition may include 400 to 600 parts by weight of the asphalt concrete additive and 1000 to 2000 parts by weight of aggregate based on 100 parts by weight of the asphalt. When the content of the asphalt concrete additive is less than 400 parts by weight, it is difficult to provide sufficient bonding strength between the aggregates, and when it exceeds 600 parts by weight, the fluidity of the asphalt concrete composition is lowered, and the efficiency of road paving work may be reduced. Furthermore, when the content of aggregate exceeds 2000 parts by weight, the content of the asphalt concrete additive is small compared to the content of the aggregate, which may cause a problem that the aggregate is not sufficiently adhered, and when the content of the aggregate is less than 1000 parts by weight, the content of the aggregate There may be a problem in that the physical properties of asphalt concrete produced because of its small amount are weakened.

Furthermore, the asphalt concrete composition can be uniformly mixed with the asphalt concrete composition using heating and mixing equipment, and then the asphalt concrete road can be constructed through the steps of pouring, compacting and curing the uniformly mixed asphalt concrete composition.

Hereinafter, the present invention will be described in more detail through specific examples. The following examples are merely examples to help the understanding of the present invention, and the scope of the present invention is not limited thereto.

Example

Example 1

(1) Manufacturing of ferronickel slag/waste plastic composite

10 g of waste plastic, which is 30-50 μm thick, less than 2 mm long, and has a plate shape, containing polyethylene as the main component, was spread on a stainless steel plate of 30 cm in width and length, and then irradiated with an electron beam of 20 kGy for 5 minutes. Separately, 190 g of ferronickel slag having an average particle size of 0.1 to 3 mm was put into a heating stirrer, and while heating to a surface temperature of 170 ° C., the waste plastic was added and stirred for 5 minutes to coat the rotating ferronickel slag particles. After cooling to room temperature, a ferronickel slag/waste plastic composite was prepared.

(2) Ascon composition preparation

With respect to 100 parts by weight of petroleum asphalt having a penetration degree of 72dmm at 25° C., 500 parts by weight of the ferronickel slag/waste plastic composite prepared in (1) above, 1,400 parts by weight of coarse aggregate having a particle diameter of 6 to 13 mm, a particle diameter of 0.01 to 0.06 After mixing 100 parts by weight of fine powder aggregate of mm (use an aggregate suitable for KS F 2357) at 160° C., it was stirred at a speed of 300 to 500 rpm for 5 to 10 minutes to prepare an asphalt concrete composition.

Example 2

In Example 1, an asphalt concrete composition was prepared in the same manner as in Example 1, except that the waste plastic was treated with atmospheric plasma (output: 200 to 300 W) rather than an electron beam.

Example 3

In Example 1, an asphalt concrete composition was prepared in the same manner as in Example 1, except that polypropylene waste plastic was used instead of polyethylene.

Example 4

In Example 1, polyethylene vinyl acetate was used instead of polyethylene.

Comparative Example 1

In Example 1, an asphalt concrete composition was prepared in the same manner as in Example 1, except that each component, not the ferronickel slag/waste plastic composite, was prepared by a blending method.

That is, 475 parts by weight of ferronickel slag, 25 parts by weight of waste plastic, 1,400 parts by weight of aggregate, and 100 parts by weight of fine powder aggregate with respect to 100 parts by weight of petroleum asphalt having a penetration degree of 25° C. of 72 dmm at 160° C. 300 to 500 rpm Ascon composition was prepared by stirring at a speed of 5 to 10 minutes.

Comparative Example 2

In Example 1, an asphalt concrete composition was prepared in the same manner as in Example 1, except that the waste plastic was not irradiated with an electron beam.

Experimental example

In order to evaluate the durability of asphalt concrete prepared with the asphalt concrete compositions of Examples 1 to 4 and Comparative Examples 1 and 2, the following experiment was performed.

[Aggregate coverage after dynamic water immersion]

The resistance to moisture (water resistance) of the asphalt concrete specimens prepared with the asphalt concrete compositions of Examples 1 to 4 and Comparative Examples 1 and 2 was evaluated based on the AASHTO T 283 (RESISTANCE OF COMPACTED ASPHALT MIXTURES TO MOISTURE-INDUCED DAMAGE) test method. .

Specifically, each asphalt concrete composition was mixed at 160 ° C. for 2 minutes, put into a mold with a diameter of 101.6 mm, and at 140 ° C., the specimen was prepared by turning and compacting so that the voids were 7 ± 1%. Then, the tensile strength before and after water immersion was measured and compared. It was determined that the higher the aggregate coverage, the better, and the results are summarized in Table 1.

[Plastic deformation resistance]

The plastic deformation resistance of asphalt concrete specimens prepared from the asphalt concrete compositions of Examples 1 to 4 and Comparative Examples 1 and 2 was evaluated for dynamic stability based on the KS F 2374 (wheel tracking test of asphalt mixture) test method.

Specifically, each asphalt concrete mixture was mixed at 125 ° C. for 2 minutes, then put into a mold having a width x length x height of 300 mm x 300 mm x 50 mm and compacted at 115 ° C so that the voids were 4±1% to prepare a specimen. Thereafter, the number of passes of the wheel required to deform the specimen by 1 mm after 45 minutes at a temperature of 60° C. was calculated. As the number of passes of the wheel increased, it was judged that the asphalt concrete had excellent resistance to firing, and the results are summarized in Table 1.

Aggregate coverage after dynamic water immersion (%) Plastic deformation resistance (ash/mm) Example 1 74 1652 Example 2 68 1721 Example 3 70 1687 Example 4 75 1620 Comparative Example 1 45 743 Comparative Example 2 20 350

As can be seen from Table 1, it was confirmed that the asphalt concrete specimens prepared in Examples 1 to 4 had significantly superior aggregate coverage and dynamic stability after dynamic water immersion compared to Comparative Examples 1 and 2.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and variations are possible within the scope without departing from the technical spirit of the present invention described in the claims. It will be apparent to those of ordinary skill in the art.

Claims (11)

An ascon additive comprising a ferronickel slag/waste plastic composite comprising waste plastic and ferronickel slag particles.
According to claim 1,
The waste plastic is a functional group formed by plasma or electron beam treatment, asphalt concrete additive.
According to claim 1,
The ferronickel slag / waste plastic composite is that the waste plastic is coated on the surface of the ferronickel slag, asphalt concrete additive.
According to claim 1,
Based on the total weight of the ferronickel slag / waste plastic composite, the waste plastic is 5 to 10% by weight, asphalt concrete additive.
According to claim 1,
The waste plastic is a particle diameter of 0.1 to 3mm, asphalt concrete additive.
According to claim 1,
The waste plastic includes at least one selected from the group consisting of polystyrene, polycarbonate, polypropylene and polyethylene, ascon additive.
According to claim 1,
The ferronickel slag has a particle diameter of 0.1 to 6mm, asphalt concrete additive.
forming a functional group on the surface of the waste plastic by treating the waste plastic with an electron beam or plasma;
heating the ferronickel slag; and
Spraying the waste plastic on the surface of the ferronickel slag to form a ferronickel slag/waste plastic composite, ascon additive manufacturing method.
9. The method of claim 8,
The heating is performed at a temperature of 160 to 180 ℃, asphalt concrete additive manufacturing method.
The ascon additive of any one of claims 1 to 7;
asphalt; and
An asphalt concrete composition comprising aggregate.
11. The method of claim 10,
Based on 100 parts by weight of the asphalt, the asphalt concrete additive is 400 to 600 parts by weight, the aggregate is 1000 to 2000 parts by weight, asphalt concrete composition.

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