KR102120811B1 - Warm-mix asphalt mixture and Asphalt construction method using thereof - Google Patents

Abstract

The present invention relates to a warm-mix asphalt composition which lowers a temperature range to pull asphalt or asphalt concrete (hereinafter referred to as ascon), and to a modified asphalt construction method using the same. The warm-mix asphalt composition comprises: an adhesive resin; dimethylol ethylene urea; and ethylene bis(stearamide).

Description

A medium temperature asphalt composition and a medium temperature asphalt construction method using the same{Warm-mix asphalt mixture and Asphalt construction method using thereof}

The present invention relates to a medium-temperature asphalt composition having a lower installation range of asphalt or asphalt concrete (hereinafter referred to as asphalt) and a modified asphalt construction method.

Asphalt or asphalt concrete (ascon) is a mixture of asphalt, aggregates, and fillers, heated at a high temperature, specifically at a temperature of 150°C or higher, mixed and laid on the road, and cured at room temperature to complete construction. .

This construction method of asphalt concrete requires a lot of energy to replace the high-temperature heating, causing excessive fuel waste, and causing excessive carbon dioxide to cause air pollution. In addition, it is difficult to construct in low temperature environments such as winter, and it is difficult to construct ascons of high quality for the purpose.

In order to solve this problem, a variety of medium-temperature asphalt has been developed, and various medium-temperature asphalt has been developed. However, it is difficult to express sufficient physical properties in an environment in which the temperatures of the summer and winter are rapidly changing. In addition, when the water resistance is low, there is a problem that the asphalt is peeled off the aggregate and the pavement is damaged due to repeated freezing and thawing in the winter, and there is a problem that the dynamic stability is deteriorated.

Korea registered patent No. 10-1910135 (October 15, 2018)

One aspect of the present invention is to provide a modified asphalt mixture that can be constructed at low temperatures. Specifically, it is an object of the present invention to provide a modified asphalt mixture having excellent construction properties and a short curing time after construction even in an environment in which the temperature is rapidly changed, such as in the summer and winter.

In addition, an aspect of the present invention can be constructed at a low temperature of 80 ~ 150 ℃, excellent asphalt and aggregate mixing properties, asphalt composition of the asphalt composition excellent physical properties such as compaction, moisture resistance, crack resistance, etc. Want to provide.

One aspect of the present invention for achieving the above object is an asphalt, adhesive resin, dimethylol ethylene urea represented by the following formula 1 and ethylene bis (stearamid) represented by the following formula 2 is a moderate temperature asphalt composition.

[Formula 1]

[Formula 2]

Another aspect of the present invention, with respect to 100 parts by weight of aggregate, 1 to 50 parts by weight of the medium-temperature asphalt composition according to the above aspect, styrene-based resin, ethylene-based resin, any one or more reinforcing resin selected from ethylene vinyl acetate resin 0.1 ~ 1.0 parts by weight, a mixture of any one or more porous inorganic materials selected from fly ash, bottom ash and coal ash by-products, 0.1 to 20 parts by weight of the fiber reinforcement and 0.1 to 0.5 parts by weight of the fiber reinforced asphalt mixture.

Another aspect of the present invention a) 100 to 100 parts by weight of aggregate, 1 to 50 parts by weight of the medium-temperature asphalt composition according to the above aspect, styrene-based resin, ethylene-based resin, any one or more reinforcement selected from ethylene vinyl acetate resin Preparing a medium-temperature asphalt mixture by mixing 0.1 to 1.0 parts by weight of resin, 0.1 to 20 parts by weight of at least one porous inorganic material selected from fly ash, bottom ash, and coal ash by-products and 0.1 to 0.5 parts by weight of a fiber reinforcement agent; And

b) laying the medium-temperature asphalt mixture and compacting at 80 to 150°C;

It is a construction method of medium-temperature asphalt containing.

Asphalt composition according to an aspect of the present invention is excellent in mixing with the aggregate, it is good mixing at low temperature, when the asphalt mixture mixed with the aggregate is applied at 80 ~ 150 ℃, more specifically at a low temperature of 90 ~ 110 ℃ This has the possible effect. In addition, since the construction is performed in a season in which the temperature changes rapidly, such as in the winter and summer, there is no significant effect on the physical properties of the pavement, and thus asphalt having excellent physical properties can be provided regardless of the season.

In addition, the asphalt mixture in which the asphalt composition according to an aspect of the present invention is mixed with aggregate, etc., has excellent physical and chemical properties such as compaction, moisture resistance, and crack resistance.

In addition, the asphalt composition according to an aspect of the present invention can significantly reduce the fuel loss and the amount of carbon dioxide generated during processing of a mixture of conventional asphalt, and also copes with the installation workability, such as winter, and heat loss due to the travel time of processing plants and sites. It is possible to provide this possible asphalt.

In addition, the asphalt composition according to an aspect of the present invention has the effect of lowering the preparation and construction temperature of the mixture in the case of straight asphalt by 20°C or more, and in the case of modified asphalt by about 30 to 40°C.

In addition, the asphalt composition according to an aspect of the present invention can significantly solve the problem of complaints caused by significantly shortening the opening time of traffic in a congested area by significantly shortening the cooling rate during construction.

Hereinafter, the present invention will be described in more detail through specific examples or examples, including the accompanying drawings. However, the following specific examples or examples are only one reference for explaining the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

Also, unless defined otherwise, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used in the description of the present invention are only for effectively describing a specific embodiment and are not intended to limit the present invention.

Also, the singular form used in the specification and the appended claims may be intended to include the plural form unless otherwise indicated in the context.

In the present invention, the'asphalt composition' means a mixed composition comprising an asphalt and a modifier for lowering the construction temperature of the asphalt.

In the present invention,'asphalt mixture' means a mixture mixed with an aggregate and a filling material, etc. in order to install the'asphalt composition' containing the modifier of the present invention on the road.

In the present invention,'medium temperature' means a low construction temperature compared to the construction and laying temperature of a typical asphalt mixture, and specifically means an asphalt mixture capable of compacting at 80 to 150 °C.

The inventors of the present invention, as a result of research in order to achieve the above object, by using additives of a specific structure in the asphalt composition can adjust the physical properties such as viscosity and dough toughness when preparing an asphalt mixture, productivity, work of the asphalt mixture The present invention was completed by discovering that it is possible to improve the performance and performance.

Specifically, one aspect of the present invention is a medium-temperature asphalt composition comprising asphalt, an adhesive resin, dimethylol ethylene urea represented by the following Chemical Formula 1, and ethylene bis (stearamid) of the following Chemical Formula 2.

[Formula 1]

[Formula 2]

In one embodiment, the adhesive resin is rosin, rosin, C5 petroleum resin, C9 petroleum resin, dicyclopentadiene resin and any one or two or more mixtures selected from the group consisting of modified products by maleic anhydride Can be.

In one aspect, the composition may be to contain 1 to 50 parts by weight of tackifier resin, 1 to 30 parts by weight of dimethylol ethylene urea and 1 to 10 parts by weight of ethylene bis (stearamid) with respect to 100 parts by weight of asphalt.

Another aspect of the present invention, with respect to 100 parts by weight of the aggregate, any one or more reinforcing resins selected from 1 to 50 parts by weight of the medium-temperature asphalt composition, styrene-based resin, ethylene-based resin, ethylene vinyl acetate resin of the above aspect 0.1 ~ It is a medium-temperature asphalt mixture comprising 1.0 parts by weight, 0.1 to 20 parts by weight of any one or more porous inorganic materials selected from fly ash, bottom ash, and coal ash by-products, and 0.1 to 0.5 parts by weight of a fiber reinforcement agent.

In one embodiment, the medium-temperature asphalt mixture has a softening point of 70 ~ 100 ℃, the dynamic stability may be more than 800 (times / mm).

Another aspect of the present invention is a) any one or more reinforcing resins selected from 1 to 50 parts by weight of a medium-temperature asphalt composition, styrene-based resin, ethylene-based resin, ethylene vinyl acetate resin with respect to 100 parts by weight of aggregate 0.1 to 1.0 parts by weight, a mixture of 0.1 to 20 parts by weight of one or more porous inorganic materials selected from fly ash, bottom ash and coal ash by-products and 0.1 to 0.5 parts by weight of a fiber reinforcement agent to prepare a moderate temperature asphalt mixture; And

b) laying the medium-temperature asphalt mixture and compacting at 80 to 150°C;

It is a construction method of medium-temperature asphalt containing.

Hereinafter, each configuration of the present invention will be described in more detail.

First, the asphalt composition of the present invention will be described in more detail. The asphalt composition of the present invention includes functional additives to further improve the low temperature workability of asphalt and asphalt and miscibility with aggregates. More specifically, as a functional additive of the present invention, the reason for the use of a mixture of an adhesive resin, dimethylol ethylene urea, and ethylene bis (stearamid) is unknown, but low-temperature workability is greatly improved, and aging due to seasonal changes after construction is less. In addition, it is possible to significantly shorten the opening time of traffic by shortening the curing time.

In general, asphalt cement becomes liquid when the temperature is high, becomes very hard at low temperatures, and this temperature sensitivity varies depending on the type of asphalt. In addition, asphalt is rich in plasticity (可塑性), waterproof, electrical insulation, adhesion, etc., and has a chemically stable characteristic. Therefore, when the composition of the asphalt concrete is usually mixed at 160 to 200°C, the temperature of the composition decreases in the step of moving to the construction site and laying, and the primary compaction temperature is being applied at 140 to 150°C. Construction must be carried out quickly before the temperature goes below 110℃.

Since the asphalt composition of the present invention has fluidity even at a temperature below the normal construction temperature, construction is possible, and more specifically, an asphalt mixture capable of compacting at 80 to 150°C and more specifically 90 to 120°C can be prepared. To make.

In one aspect of the present invention, the asphalt may include both natural and petroleum asphalt. The asphalt (Asphalt) is a black or dark brown solid or semi-solid thermoplastic material composed of thousands of polymer hydrocarbons (CH) containing a mixture of organic compounds and traces of inorganic compounds, etc., and the United States is an asphalt cement (Asphalt Cement) , Europe is commonly used as Bitmen (bitumen). Natural asphalt, straight asphalt (KS M 2201), asphalt cement (road pavement asphalt) such as rake asphalt, rock asphalt, sand asphalt, gilsonite asphalt, grahamite asphalt, glance speech asphalt, etc. Used as cutback asphalt (KS M 2202), emulsified asphalt (KS M 2203), blown asphalt, modified asphalt, such as petroleum asphalt and tar (Tar), the tar is mainly obtained in the process of carbonization and is very It has a peculiar smell and is a black liquid. It is determined by the Korean Industrial Standard KS M 2206 packaging tar.

In one aspect of the present invention, the asphalt can be used without limitation as long as it is a commonly used asphalt. Specifically, for example, any one or a mixture of two or more selected from natural asphalt, petroleum asphalt, petroleum pitch, recycled asphalt, modified asphalt, and the like can be used, but is not limited thereto.

The reclaimed asphalt (Reclaimed Asphalt) means the asphalt extracted from the reclaimed asphalt (Reclaimed Asphalt Pavement) or remaining in the waste asphalt.

In addition, the asphalt may be selected from those having an asphalt common high-temperature grade of 46 to 82°C and a low-temperature grade of -10 to -40°C according to KS F 2389. Alternatively, the asphalt may have an intrusion degree of 60 to 100 and a softening point of 42 to 52°C. Or it may be an asphalt having a penetration degree of 0 to 40 and a softening point of 65 to 130°C. In the above range, it is preferable to select an appropriate grade of asphalt according to the climate or traffic conditions of the region, but is not limited thereto.

The modified asphalt may include any one or two or more mixtures selected from the group consisting of a polymer-based modifier and a hydrocarbon-based modifier. More specifically, examples of the polymer-based modifier include natural rubber, vinyl chloride, ethylene methacrylate, ethylene propylene rubber, ethylene vinyl acetate copolymer, polybutadiene, polyisoprene, butyl rubber, styrene-butadiene-rubber copolymer, styrene- Butadiene-styrene copolymer, polyethylene, polypropylene, nylon, polychloroprene rubber, and may be any one or two or more mixtures selected from waste tire recycled rubber, but are not limited thereto. The polymer-based modifier is not limited, but may have a weight average molecular weight of 30,000 to 500,000 g/mol. The content may be 0.1 to 20% by weight, more preferably 1 to 10% by weight of the modified asphalt content, but is not limited thereto.

Examples of the hydrocarbon-based modifier may be any one or a mixture of two or more selected from wax-based asphalt additives, natural asphalt, petroleum pitch, and Gilsonite, but are not limited thereto. The content of the hydrocarbon-based modifier may be included in 0.1 to 20% by weight, more preferably 1 to 10% by weight of the modified asphalt content, but is not limited thereto.

In one embodiment of the present invention, a tackifier resin is used to lower the softening point of asphalt and to improve physical properties such as dynamic stability, and when mixed with dimethylol ethylene urea and ethylene bis (stearamid) Is unknown, but the softening point is significantly lowered, the dynamic stability is more excellent, and water resistance and crack resistance are excellent. In addition, the mixability and solubility with asphalt are further improved, and long-term storage stability is further improved.

The adhesive resin is not particularly limited as long as it is generally used industrially, for example, rosin, rosin, C5 petroleum resin, C9 petroleum resin, dicyclopentadiene resin, and modified products of these with maleic anhydride Any one or two or more mixtures selected from the group consisting of the like may be used. The adhesive resin may have a molecular weight of 500 to 5,000 g/mol, more specifically 1,000 to 4,000 g/mol, and is not limited thereto.

The adhesive resin may use 1 to 50 parts by weight, more specifically 5 to 40 parts by weight, and more specifically 10 to 30 parts by weight based on 100 parts by weight of asphalt, but is not limited thereto. It is preferable in the above range because it has excellent properties such as softening point, dynamic stability, moisture resistance and crack resistance of the asphalt mixture.

In one aspect of the present invention, dimethylol ethylene urea represented by the following formula (1) is used to improve the productivity, workability and performance of the asphalt mixture, by mixing with the adhesive resin and ethylene bis (stearamid) to The effect is expressed.

[Formula 1]

The dimethylol ethylene urea can be adjusted and used depending on the object to be applied, so the content is not limited, for example, with respect to 100 parts by weight of asphalt, 1 to 30 parts by weight, more specifically 5 to 25 parts by weight, more Specifically, 10 to 20 parts by weight may be used. Excellent compatibility with asphalt in the above range, it is possible to achieve a sufficient effect to improve the productivity, workability and performance of the target asphalt mixture.

In one aspect of the present invention, the ethylene bis (stearamid) of Formula 2 is used to improve the productivity, workability and performance of the asphalt mixture, and its effect is obtained by mixing with the adhesive resin and dimethylol ethylene urea. Is expressed.

[Formula 2]

Since the content of the ethylene bis (stearamid) can be adjusted and used depending on the target to be applied, the content is not limited, for example, 1 to 10 parts by weight, more specifically 2 to 8 parts per 100 parts by weight of asphalt Part by weight, more specifically may be to use 3 to 7 parts by weight. Excellent compatibility with asphalt in the above range, it is possible to achieve a sufficient effect to improve the productivity, workability and performance of the target asphalt mixture.

In one aspect of the invention, the first aspect of the asphalt mixture may be to include aggregate and the neutralized asphalt composition.

The second aspect of the asphalt mixture may include aggregate, the neutralized asphalt composition, a reinforcing resin, a porous inorganic material, and a fiber reinforcement agent.

The third aspect of the asphalt mixture may further include an additive typically used in the art in the asphalt mixture of the first aspect or the second aspect.

In one aspect of the present invention, the aggregate may be to use natural aggregate, recycled aggregate, and mixed aggregates thereof. The recycled aggregate may be, for example, any one or two or more mixtures selected from the group consisting of construction waste and industrial waste such as steel slag and aggregate obtained from reclaimed asphalt (reclaimed asphalt). The mixed aggregate of the natural aggregate and the recycled aggregate may include 30 to 99.9% by weight of the natural aggregate and 0.1 to 70% by weight of the recycled aggregate, but is not limited thereto.

The content and size of aggregate is not limited as it is determined by the type and porosity of the pavement to be constructed, the ground conditions of the road surface to be constructed, weather conditions, traffic volume, and the number of lanes. The aggregate may be used by mixing coarse aggregate and fine aggregate according to the type of packaging to be constructed.

In one aspect of the present invention, the neutralized asphalt composition is as described above, and uses 1 to 50 parts by weight, more specifically 5 to 40 parts by weight, and more specifically 10 to 30 parts by weight based on 100 parts by weight of aggregate. It is preferable to provide an asphalt mixture having excellent physicochemical properties such as low-temperature constructability and compaction, moisture resistance, and crack resistance, which are targeted in the above range, but are not limited thereto.

In one aspect of the present invention, the asphalt mixture includes a reinforcing resin to prevent the aggregate from being chemically bonded to the surface of the aggregate, thereby preventing the aggregate from being detached, and further improving durability. The reinforcing resin may also use recycled resin.

More specifically, for example, any one or two or more mixtures selected from styrene-based resins, ethylene-based resins and ethylene-vinyl acetate resins can be used.

The styrene-based resin may be a pellet obtained by melt-extruding expanded polystyrene (EPS) or a powder pulverized therein.

The ethylene-based resin is preferably used by mixing any one or more thermoplastic resins selected from linear low-density polyethylene, low-density polyethylene, high-density polyethylene, ethylene vinyl acetate copolymer resin, poly (meth) acrylic resin, and the like. The mixing ratio can be used by adjusting the mixing ratio differently according to the properties to be controlled. For the purpose of improving the fluidity, 30 to 60% by weight of linear low density polyethylene and 40 to 70% by weight of high density polyethylene can be mixed and used.

More specifically, the reinforcing resin may be used by mixing styrene-based resin, ethylene-based resin and ethylene-vinyl acetate resin at the same ratio, and by mixing and using the strength, durability, compaction, moisture resistance of the asphalt mixture, Physical and chemical properties such as crack resistance can be further improved.

The content of the reinforcing resin may be used in an amount of 0.1 to 1.0 parts by weight, more specifically 1 to 8 parts by weight, and more specifically 2 to 7 parts by weight based on 100 parts by weight of aggregate. It is desirable to improve and improve the physical properties of asphalt, but is not limited thereto.

In one aspect of the present invention, the asphalt mixture includes a porous inorganic material, and by containing the porous inorganic material, since the porous material contains moisture after asphalt construction, it is possible to lower the temperature of the asphalt pavement, and the pavement after construction By lowering the temperature of the sieve, it is possible to open the traffic quickly. In addition, there is an effect that can prevent the heat island (Heat Island) phenomenon that occurs in the summer, and prevent the latent heat (radiation heat) of the asphalt. Specifically, for example, any one or two or more mixtures selected from fly ash, bottom ash and coal ash by-products may be used.

The content of the porous inorganic material may be used in an amount of 0.1 to 20 parts by weight, more specifically 1 to 15 parts by weight, and more specifically 5 to 10 parts by weight based on 100 parts by weight of aggregate, but is not limited thereto. It is preferable to maintain the strength of the asphalt composition in the above content range, and is sufficient to express the desired function.

In one aspect of the present invention, the asphalt mixture can prevent plastic deformation by including a fiber reinforcement agent, further increase the durability of the asphalt, and improve the adhesion between the aggregate and the asphalt and the coating thickness of the aggregate.

The fiber reinforcement agent is any one selected from cellulose fibers, polyamide fibers, polyester fibers, polyurethane fibers, polyolefin fibers, polyvinyl chloride fibers, polyfluoroethylene fibers, polyacrylonitrile fibers, etc. Alternatively, two or more fibers may be mixed and used. More preferably, the cellulose fiber is used, and the cellulose fiber has many pores on the surface, which serves to enhance the flow of asphalt and the aggregate thickness of the aggregate with a large amount of asphalt absorption, and the temperature decreases after the laying operation. Accordingly, it is possible to not only improve the adhesion between the aggregates, but also prevent the occurrence of fatigue cracks.

The content of the fiber reinforcing agent may be to use 0.1 to 0.5 parts by weight, more specifically 0.2 to 0.4 parts by weight based on 100 parts by weight of aggregate, and is intended to be used in a range that does not rapidly increase the viscosity of the composition in the above range. It is suitable because it is suitable for expressing physical properties.

The medium-temperature asphalt mixture of the present invention has a softening point of 70 to 100°C, more specifically 80 to 95°C, and a dynamic stability of 800 times/mm or more, and more specifically 800 to 1000 times/mm. In addition, the water resistance is 50% or more, more specifically 50 to 80%, the crack resistance is 17000 N or more, more specifically 17000 to 20000 N can satisfy the physical properties.

In addition, the medium-temperature asphalt mixture of the present invention can be compacted at 80 to 150 °C, more specifically compacted at 90 to 120 °C, and open to traffic at temperatures below 70 °C.

Next, the construction method of the medium-temperature asphalt using the medium-temperature asphalt composition of the present invention will be described in detail.

Ascon of the present invention has a fluidity capable of construction even at a medium temperature, i.e., 80 to 150°C, more specifically 90 to 120°C, which is lower than normal ascon laying temperature, and according to these characteristics, manpower is installed without using a finisher. Even if you do, you can make a sufficient primary compaction.

If you describe the construction method in detail,

a) 1 to 50 parts by weight of any one of the neutralizing asphalt compositions selected from claims 1 to 3, based on 100 parts by weight of aggregate, any one or more selected from styrene-based resins, ethylene-based resins, and ethylene vinyl acetate resins. Preparing a medium-temperature asphalt mixture by mixing 0.1 to 1.0 parts by weight of reinforcing resin, 0.1 to 20 parts by weight of at least one porous inorganic material selected from fly ash, bottom ash, and coal ash by-products and 0.1 to 0.5 parts by weight of a fiber reinforcement agent; And

b) laying the medium-temperature asphalt mixture and compacting at 80 to 150°C;

It includes.

In step a), the mixing may be performed at 100 to 150°C, more specifically 110 to 140°C. Deterioration does not occur in the above range, and may be uniformly and evenly mixed, so it is preferable, but is not limited thereto.

In addition, after the step b), c) curing at room temperature may further include.

Also, if necessary, after step c), applying an acrylic (MMA)-based or modified unsaturated polyester-based colored thin film coating composition having slip resistance; it is also possible to further add. At this time, when the colored thin film coating composition is applied, a porous inorganic material such as by-products of coal-fired thermal power plant, fly ash, pearlite, zeolite, or agglomerated and fired by agglomerating the porous material and then mixing and spraying the aggregate having the heat-shielding function, or After application of the colored thin film coating composition, a porous inorganic material such as a by-product of coal-fired thermal power plant, fly ash, pearlite, zeolite, or agglomeration of the porous material is calcined, and then aggregated with a crushed heat shielding function is sprayed.

The aggregate having the heat shielding function maximizes porosity through a firing process, and improves wear resistance compared to before firing. Also, as the aggregate having the heat shielding function, foam aggregate, bottom ash, and the like are included. As the size, one having a particle size of about 0.1 to 10 mm can be used. As the resin binder used in the colored thin film coating composition, the use of an acrylic resin improves adhesion to asphalt, so that the upper layer reinforcement portion may serve to fix it so as not to be separated from the lower portion.

Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples. However, the following examples and comparative examples are only examples for explaining the present invention in more detail, and the present invention is not limited by the following examples and comparative examples.

Hereinafter, the physical properties were measured by the following measurement methods.

1) Mixability between asphalt and aggregate

AASHTO T 195-11 Standard Method of Test for Determining Degree of Particle Coating of Asphalt Mixtures. Specifically, after mixing the asphalt mixtures of Examples and Comparative Examples at 125° C. for 2 minutes, the ratio of coated aggregates was measured based on the total amount of coarse aggregate remaining in a sieve by sieving with a 9.5 mm sieve. The quality standard is over 95%.

2) compaction of asphalt mixture

Based on NCHRP Report 691 Mix Design Practices for Warm mix Asphalt, the compaction test method using SGC. Specifically, after mixing the asphalt mixtures of Examples and Comparative Examples at 125°C for 2 minutes, they were placed in a mold having a diameter of 101.6 mm, and the compaction number until the pores became 7% was measured using a turning compactor at 115°C.

3) Water resistance (aggregate coverage after dynamic immersion, %)

Based on EN-12697-11 Determination of the affinity between aggregate and bitumen test method. Specifically, among the aggregates described in Examples and Comparative Examples, 510 g of aggregate between 11.2 to 8 mm and 16 g of the asphalt composition were mixed at the mixing temperature described in Examples and Comparative Examples for 3 minutes, cooled at room temperature, and then taken a sample of 150 g of water. After putting it in the test vial containing it and rotating it for 24 hours at a rate of 60 times per minute, the amount of asphalt coated on the aggregate was visually evaluated.

4) Crack resistance (Marshall flow value, 1/100cm)

Based on the Marshall stability and flow value test method of the asphalt mixture using the KS F 2337 Marshall tester. Specifically, the asphalt mixtures of Examples and Comparative Examples were mixed for 2 minutes at 165° C., placed in a mold having a diameter of 101.6 mm, compacted 75 times on both sides at 145° C. to prepare specimens, and then measured and compared with Marshall flow values.

5) Porosity

As a percentage of the volume occupied by voids among the volume of the compacted asphalt mixture, the measured density and theoretical maximum density (KS F 2366) of the specimen were calculated according to the test method.

6) Dynamic stability

The dynamic stability was measured by applying a force of 6.4 kg/cm2 of ground pressure to a specimen of 300 mm × 300 mm × 50 mm at 60°C according to the wheel tracking experiment (KS F 2374) method, and measuring the number of round trips per dip depth (times/mm). The higher the value, the better the dynamic stability, which means less deformation. The quality standard is more than 750 times/mm.

7) Softening point

As an experiment to determine the degree of fluid resistance of asphalt at high temperatures, a high softening point means that the viscosity of the asphalt material is high, and plastic deformation occurs when the asphalt mixture is subjected to a traffic vehicle load at high temperatures, such as in summer. It means temperature. It was tested according to the method of KS M 2250 (return method).

[Example 1]

1) Preparation of asphalt composition

General asphalt (AP-5) having an intrusion degree of 60 to 80 was heated to 140°C while stirring at 1500 rpm with a Henschel mixer, and then maintained at 3000 rpm, with respect to 100 parts by weight of the asphalt, an adhesive resin of C9 petroleum resin 30 parts by weight, 10 parts by weight of dimethylol ethylene urea and 5 parts by weight of ethylene bis (stearamid) were sequentially added, and the stirring temperature was maintained at 140°C and stirred for 30 minutes to prepare an asphalt composition.

2) Preparation of asphalt mixture and specimen

With respect to 100 parts by weight of aggregate consisting of a mixture of granite that satisfies WC-3 particle size, satisfies aggregate specifications in accordance with KS F 2357, and limestone filler that satisfies specifications in accordance with KS F 3501, 5 weight of the prepared asphalt composition Part, 0.5 parts by weight of a low-density polyethylene reinforcement resin, 5 parts by weight of fly ash and 0.3 parts by weight of a cellulose fiber reinforcement agent were added, followed by mixing at 150°C to prepare an asphalt mixture.

Using the prepared asphalt mixture compacted at 100 ℃ to prepare a specimen, it was confirmed that the fluidity and compaction is excellent.

The physical properties of the specimen are measured and are shown in Table 1 below.

[Examples 2 to 6]

Samples were prepared in the same manner as in Example 1, except that the contents were adjusted as shown in Table 1 below.

The physical properties of the specimen are measured and are shown in Table 1 below.

[Comparative Example 1]

Specimens were prepared in the same manner as in Example 1, except that the contents were adjusted as shown in Table 2 below.

That is, a specimen was prepared in the same manner as in Example 1, except that dimethylol ethylene urea and ethylene bis (stearamid) were not included when preparing the asphalt composition.

Table 2 below shows the physical properties of the specimens.

[Comparative Example 2]

Specimens were prepared in the same manner as in Example 1, except that the contents were adjusted as shown in Table 2 below.

That is, a specimen was prepared in the same manner as in Example 1, except that the adhesive resin and ethylene bis (stearamid) were not included in the preparation of the asphalt composition.

Table 2 below shows the physical properties of the specimens.

[Comparative Example 3]

Specimens were prepared in the same manner as in Example 1, except that the contents were adjusted as shown in Table 2 below.

That is, a specimen was prepared in the same manner as in Example 1, except that the adhesive resin and dimethylol ethylene urea were not included in the preparation of the asphalt composition.

Table 2 below shows the physical properties of the specimens.

[Comparative Example 4]

In Example 1, dimethylol ethylene urea and ethylene bis (stearamid) were not used when preparing the asphalt composition, and instead, wax-based additives (SASOL, Sasobit) were used as the contents of Table 2 below. Samples were prepared in the same manner as in Example 1.

Table 2 below shows the physical properties of the specimens.

content
(Parts by weight) Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Asphalt composition asphalt 100 100 100 100 100 100 Adhesive resin 20 20 20 20 30 50 Dimethylol ethylene urea 2 10 20 30 10 10 Ethylene bis (stearamid) 3 10 10 10 10 10 Wax-based additive - - - - - - Asphalt mixture aggregate 100 100 100 100 100 100 Asphalt composition 5 5 5 5 5 5 Reinforcement resin 0.5 0.5 0.5 0.5 0.5 0.5 Porous inorganic material 5 5 5 5 5 5 Fiber reinforcement 0.3 0.3 0.3 0.3 0.3 0.3 Properties Mixability (%) 95.5 99.8 100 100 100 100 Compaction
(time) 17.1 13.5 12.9 12.6 12.2 14.5 Compaction temperature
(℃) 100 100 100 100 100 100 Moisture resistance (%) 50 55 60 65 65 70 Crack resistance (N) 17,860 17,960 18,120 18,250 18,630 18,550 Porosity (%) 4.2 4.3 4.4 4.4 4.4 4.3 Dynamic stability
(Times/mm) 860 950 980 980 995 920 Softening point
(℃) 80 85 90 90 90 89

content
(Parts by weight) Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Asphalt composition asphalt 100 100 100 100 Adhesive resin 20 - - 20 Dimethylol ethylene urea - 10 - - Ethylene bis (stearamid) - - 10 - Wax-based additive - - - 5 Asphalt mixture aggregate 100 100 100 100 Asphalt composition 5 5 5 5 Reinforcement resin 0.5 0.5 0.5 0.5 Porous inorganic material 5 5 5 5 Fiber reinforcement 0.3 0.3 0.3 0.3 Properties Mixability (%) 90.5 91.5 91.8 97.8 Compaction
(time) 19.9 19.5 19.5 13.8 Compaction temperature
(℃) 150 120 120 120 Moisture resistance (%) 5 10 10 5 Crack resistance (N) 15,120 15,520 15,880 15,320 Porosity (%) 5.7 5.8 5.8 5.5 Dynamic stability
(Times/mm) 500 510 530 1500 Softening point
(℃) 70 72 72 72

As shown in Table 1, in Examples 1 to 6 using the asphalt composition of the present invention, as the content increases, the coating rate coated on the aggregate increases, so that the mixability between asphalt and aggregate improves, and the number of compactions decreases. It was confirmed that the dynamic stability was increased. In the case of dynamic stability, the content of the adhesive resin decreased slightly, but it was satisfactory in quality standards.

In addition, as shown in Table 2, compared to Comparative Examples 1 to 3 using only one component, it was confirmed that all the physical properties of Examples 1 to 6 are greatly improved.

In addition, when comparing Example 1 using an additive with the same content as Comparative Example 4 using a wax-based additive (SASOL, Sasobit) commonly known as a medium temperature additive, similar physical properties were exhibited. It was confirmed that the softening point was higher, the porosity was lower, the crack resistance was high, the water resistance was significantly increased, and the compaction temperature was lowered.

As described above, the present invention has been described by specific matters and limited embodiments and drawings, but it is provided to help a more comprehensive understanding of the present invention, and the present invention is not limited to the above embodiments, and the present invention Various modifications and variations can be made by those skilled in the art.

Accordingly, the spirit of the present invention should not be limited to the described embodiments, and should not be determined, and all claims that are equivalent or equivalent to the scope of the claims as well as the claims to be described later belong to the scope of the spirit of the invention. .

Claims (6)

With respect to 100 parts by weight of asphalt, 1 to 50 parts by weight of an adhesive resin, 1 to 30 parts by weight of dimethylol ethylene urea represented by the following Chemical Formula 1, and 1 to 10 parts by weight of ethylene bis (stearamid) represented by the following Chemical Formula 2 Asphalt composition.
[Formula 1]

[Formula 2]

According to claim 1,
The adhesive resin is rosin, rosin, C5-based petroleum resin, C9-based petroleum resin, dicyclopentadiene-based resin and a mixture of any one or two or more selected from the group consisting of maleic anhydride and modified mixtures. According to claim 1,
A medium temperature asphalt composition comprising 20 to 50 parts by weight of an adhesive resin, 2 to 30 parts by weight of dimethylol ethylene urea, and 3 to 10 parts by weight of ethylene bis (stearamid) relative to 100 parts by weight of asphalt. With respect to 100 parts by weight of aggregate, any one or more reinforcing resins selected from 1 to 50 parts by weight of any one of the neutralizing asphalt compositions selected from claims 1 to 3, styrene-based resins, ethylene-based resins, and ethylene vinyl acetate resins 0.1 to 1 parts by weight, a mixture of any one or more porous inorganic materials selected from fly ash, bottom ash and coal ash by-products, 0.1 to 20 parts by weight and a fiber reinforcement agent containing 0.1 to 0.5 parts by weight of asphalt mixture. The method of claim 4,
The medium-temperature asphalt mixture has a softening point of 70 ~ 100 ℃, dynamic stability of 800 times / mm or more medium temperature asphalt mixture. a) 1 to 50 parts by weight of any one of the neutralized asphalt compositions selected from claims 1 to 3, based on 100 parts by weight of aggregate, any one or more selected from styrene-based resins, ethylene-based resins, and ethylene vinyl acetate resins Preparing a medium-temperature asphalt mixture by mixing 0.1 to 1.0 parts by weight of reinforcing resin, 0.1 to 20 parts by weight of at least one porous inorganic material selected from fly ash, bottom ash, and coal ash by-products and 0.1 to 0.5 parts by weight of a fiber reinforcement agent; And
b) laying the medium-temperature asphalt mixture and compacting at 80 to 150°C;
Construction method of medium-temperature asphalt containing.