KR101487855B1 - The recycling asphalt mixture for reforming - Google Patents

Abstract

The present invention relates to a reformed recycling asphalt mixture which has 0.5-1.5 wt% of a reforming composition including a tire waste rubber powder which is a rubber resin polymer, low density polyethylene having the low crystallinity, a commercializing agent, carbon black, a calcium hydrate, organic manganese, an antioxidation agent, a rubber antiaging agent, an ultraviolet absorbent, and a dispersing agent be added to a recycling asphalt mixture having a straight asphalt destructive distillation product and amorphous wax added as a permeable material to an aggregate mixture including circulation aggregates, large aggregates, fine aggregates, and a filler, and heated.

Description

The recycling asphalt mixture for reforming < RTI ID = 0.0 >

The present invention relates to a modified regenerated asphalt mixture, and more particularly to a regenerated asphalt mixture which is prepared by adding a straight asphalt high boiling point crude cracked distillate and an amorphous wax as an osmotic material to an aggregate mixture composed of a recycled aggregate, a large aggregate, A modified composition 0.5 composed of waste tire rubber powder, low-crystallinity low-density polyethylene, compatibilizer, carbon black, calcium hydroxide, organic manganese, antioxidant, rubber aging inhibitor, ultraviolet absorber and dispersant, which is rubber based resin polymer (CRM) To 1.5% by weight of the modified asphalt mixture.

The internal structure of the asphalt is determined by the chemical composition and the shape of the asphalt. The major components of the asphalt are hydrogen, sulfur, oxygen and nitrogen as well as hydrocarbons. In addition, iron, barium, magnesium, nickel And also exists as a non-ionic salt oxide or a foamed structure.

The chemical composition of asphalt varies in the raw material and manufacturing process of crude oil and is composed of 82 ~ 88% of carbon, 8 ~ 11% of hydrogen, 0 ~ 6% of sulfur, 0 ~ 1.5% of oxygen and 0 ~ 1% of nitrogen . Such constituents may vary depending on the material source and the manufacturing process, such as the modification of brown asphalt and the like, and subsequent changes in the properties of the asphalt. The structure of the asphalt chemistry is very complex. However, the asphalt component can be roughly divided into asphalt type and other components, and the other components can be divided into the osmotic component aromatic and resin type.

The asphalt component is insoluble in n-heptane and has a black or brown color. The asphalt is a material having a large unit weight and an aromatic porosity. The weight of the asphalt is about 600 ~ 300,000, but the most common asphalt weight is 1,000 ~ 100,000, the molecular size is 5 ~ 30nm and the ratio of atomic ratio of hydrogen to carbon is 1: 1. As the asphalt content increases, it hardens, has lower penetration, and has higher softening point and viscosity.

The resin material is dissolved in n-heptane. Like the asphalt system, it has a molecular structure containing a little nitrogen, sulfur and oxygen as a hydrocarbon compound. The color is dark brown, solid and semi-solid, porous material. And the ratio of the resin system to the asphalt component can be identified as the solubility. In the asphalt system, the molecular weights of molecules and resins are 500 to 50,000 and the atomic ratios of hydrogen and carbon are in the range of 1: 3 to 1: 4. The molecular weight of the naphthenic aromatic material is the smallest, and it is 40 ~ 65% of the total asphalt content and exists as a dark brown liquid. The average molecular weight is between 30 and 2000 and is formed of a non-porous carbon chain to form a non-osmotic ring. And has a property that the other weight is not dissolved in the solution as compared with the large hydrocarbon system.

The osmotic material contains linear or cyclic alkyl naphtha and alkylaromatics. Non-porous, brown or white, with average molecular weight similar to aromatic materials. It is divided into wax-based and non-wax-based materials and accounts for about 5 to 20% of asphalt-based materials. The content of such constituents is as follows: the penetration of 100 is 5.7% in the asphalt system, 19.8% in the resin system, 62.4% in the aromatic material, and 9.6% in the osmotic material.

In addition, the factors that reduce the function of asphalt from the manufacture of asphalt to the waste asphalt mixture through storage, mixing, installation, plentiful completion of construction, public process, and function of road pavement are examined. The four main mechanisms for curing asphalt are oxidation, loss of material due to volatilization, physical hardening, and osmosis. The oxidation-induced curing mechanism, like most other organic materials, causes the asphalt to slowly oxidize when exposed to air The viscosity of the asphalt is increased by reacting with particles having high activity molecules. Materials with highly active hydroxyl groups, carbon groups and carbonic acid groups become more complex molecules that further cure asphalt and reduce flexibility. The degree of oxidation depends greatly on the thickness of the asphalt film and the temperature and time, and the oxidation rate doubles with every 10 ° C increase in temperature above 100 ° C. Curing by oxidation is known to be a major cause of aging. The material loss due to volatilization mainly depends on the temperature and the environmental exposure condition. The evaporation of the volatile component can reduce the hardening rate due to the volatility loss because the asphalt having improved penetration becomes relatively nonvolatile.

Also, the physical hardening of the asphalt can be prevented to some extent if the original viscosity is restored by heating the asphalt again. This phenomenon can be easily reproduced in the room by measuring the penetration degree over a certain period of time without heating the asphalt again, and the penetration of the asphalt decreases with time.

Osmotic hardening occurs because the oil component is permeated into the asphalt aggregate, which is attributed to the osmotic property of the asphalt and the porosity of the aggregate.

According to the mechanism for reducing the functionality of asphalt as described above, asphalt starts from the manufacturing process and continuously oxidizes and hardens during storage, mixing, transportation installation, compaction and common process, and the function of the asphalt is deteriorated. Fatigue-up, fretting phenomenon, labeling (surface peeling), asphalt cracking phenomenon of asphalt, fine aggregate and fountain material due to loss of vehicle wear, ultraviolet rays, As the phenomenon occurs, the physical properties and function life of the asphalt are complete, resulting in recycled asphalt.

Surface layer of asphalt mixture (2 ± 0.5cm) Asphalt is lost due to photodegradation loss of vehicle wear due to ultraviolet rays (4 ~ 5 microns thick film on the surface of asphalt rapidly. When film is formed, oxygen absorption and volatility loss However, the oxide of such a film is easily dissolved in excellence and peels off and exposes a fresh asphalt surface.), And a lot of it is lost due to the photo-oxidation action, and the fine aggregate and the filler material are lost together with the rainwater.

In addition, the aromatic substance (naphthenic aromatic material) dissolving the insoluble solid asphalt contained in the asphalt has a very large volatilization loss and the wax is lost due to the osmotic action of the osmotic material, so that the asphalt gradually hardens Gel state. In addition to the factors that cause loss of asphalt, cement, filler, etc., it is also necessary to prevent the phenomena caused by degradation of physical properties and functions of asphalt.

As described above, according to the present invention, since the loss factor of the asphalt mixture and other factors that shorten the durability of the asphalt are reduced by reducing the physical properties and functions of the asphalt, the regenerated asphalt mixture and the reforming additive, It is an object of the present invention to provide a modified regenerated asphalt mixture of quality equivalent to grade PG 76-22.

In recent years, as the crude oil price has risen, the rate of decomposition distillation of high-value-added heavy oil has been increased, resulting in a decrease in the amount of asphalt, an increase in traffic volume, and an increase in pavement construction and durability of asphalt road pavement.

In addition, efforts have been made to recycle asphalt waste materials because of the increased waste of pollutant asphalt mixture that has reached the end of its life. In recent years, methods of paving with recycled asphalt mixture using recycled aggregate (waste asphalt mixture) It is presented in the form of branches.

In Korea and Britain, the application of recovering and reusing existing asphalt pavement is not very successful. In the case of the UK, recycled asphalt pavement is mainly applied to roads with low traffic volume. Field recycled asphalt pavement began to apply in 1973. The regenerated asphalt pavement is divided into on-site regeneration and batch plant regeneration. On-site recycled packaging is divided into repackaging, remixing, and reprocessing. Repackaging and remixing are part of the on-site regeneration method, and reprocessing is classified as room temperature mixed reconditioning. The resurfacing method was first introduced in England in 1975 and is a method of scraping the surface layer of a conventional package by 20 mm and placing a new mixture of 20 mm on the heated 20 mm layer to perform voltage compaction. This operation is carried out while the recycled packaging pavers and the rollers are passed once, and the two layers of the asphalt pavement are heated in the heated state, so that the adhesion of the new and the sphere materials is satisfactory.

Regeneration Mixing process Recycled asphalt and new materials are mixed in the pug-mill mixer of recycled packaging equipment, and the installation voltage is compaction. A study on the surface properties of recycled pavement was carried out by the Transport Authority of England and TRRL and construction guidelines were prepared in 1982.

The recycled pavement at room temperature was incorporated as a road pavement in UK. The construction of this method is to crush 75mm of existing pavement surface and crush the scratched asphalt concrete to a predetermined standard, re-install it as the end of the pavement plan and spray 2-3 times asphalt emulsion It is a method to apply the oil so that the emulsion is mixed well, and then to finish with the 8-19 ton roller by compaction, sealing or dressing.

Conventional techniques using the above-mentioned heating regeneration method and room temperature regeneration method have been proposed in Korea.

In the domestic patent publication (publication number: 2013-69715), the name of the invention is referred to as "asphalt recycling additive, asphalt packaging material added with it, modified asphalt and asphalt packaging added thereto" The modified asphalt is composed of 70 to 90% of amorphous resin or gel-like or rice-like amorphous resin mixed with straight asphalt which is heated and melted (80 to 100 ° C) in manufacturing modified asphalt. The content of the modified asphalt is close to that of the resin and becomes too rigid, so that viscoelasticity inherent to the asphalt can not be expected. In the composition of claim 1, the kinetic viscosity at 60 ° C of the waste animal and plant is 10 mm ² / s to 40 mm ² / s The mixture of waste mineral oil was mixed with straight asphalt and heated at 200 ~ 250 ℃ to evaporate the aromatic fraction. In the technical composition of the asphalt regenerating additive obtained by the method of the present invention, the aromatic component is one component composed of asphalt, resin, naphthene aromatic material and osmotic material as a constituent in the asphalt although it is volatile, and the aromatic material (naphthenic system) The loss of aromatic materials is known to be a component that causes hardening of asphalt, which is not understandable because it is a component having a function of imparting viscosity and elasticity by dissolving an asphalt system which is an insoluble solid material together with a resin system.

As another example of the prior art, a "room temperature regenerated asphalt mixture" has been introduced in a domestic registered patent publication (registration number: 10-1136479).

Since such a room temperature regeneration type asphalt mixture does not apply heat to the construction method, there is an advantage that the oxidation reaction does not occur in the mixing step or the landing step and the advantage that the construction method is not complicated or the homogeneity of the regenerated asphalt is insufficient It can be said that the speed of progress of aging is common.

The waste asphalt mixture is identified based on the conventional asphalt mixture, and the modified asphalt mixture added with the lost constituent is added to the mixed asphalt mixture to impart the property and function equivalent to 76-22 to the durability And to provide this excellent modified regenerated asphalt mixture.

33 parts by weight of recycled aggregate (waste asphalt mixture), 28 parts by weight of large aggregate in 10 to 13 mm, fine aggregate of 10 mm or less and 5 parts by weight of filler were mixed with 100 parts by weight of an aggregate mixture of 60 to 100, 0.5 to 1 part by weight of high boiling point crude cracked distillate and 0.5 to 1 part by weight of wax are added to obtain a regenerated asphalt mixture which is heated and the recycled asphalt mixture to be heated and melted is mixed with a waste tire rubber A mixture of 55.3 to 62% by weight of powder, 26.3 to 33% by weight of low density polyethylene (LDPE) fine powder having a low crystallinity, 2.5 to 3% by weight of a modified olefin as a compatibilizer, 4 to 4.5% by weight of carbon black, 0.5 to 1.5% by weight of a modified additive composition comprising 0.5 to 1% by weight of organic manganese, 0.4 to 0.8% by weight of an antioxidant, 0.3 to 0.6% by weight of an ultraviolet absorber, 0.2 to 0.5% by weight of an antioxidant and 0.2 to 0.3% And the modified regenerated asphalt mixture Hameuroseo could attain the object of the present invention.

The modified regenerated asphalt mixture according to the present invention has the quality (physical properties and functions) of the level of the usual asphalt mixture (the heated asphalt mixture specified in KSF 2349), and in particular, the regenerated asphalt mixture, The asphalt mixture has low fluidity at high temperature and can reduce plastic deformation. It has the property that it does not harden too much even at low temperature (-30 ℃) and it can maintain long adhesion between asphalt and aggregate, plastic deformation and wear loss And an asphalt mixture which can reduce the volatilization loss. Therefore, durability can be greatly expected.

Fig. 1 is a photograph showing a good road surface state after 5 years in common use

The present invention is characterized in that a modified composition is added to a mixture of recycled asphalt with addition of the components of the asphalt mixture lost based on the usual asphalt mixture (heated asphalt mixture specified in KSF 2349) to the waste asphalt mixture (waste asbestos recycled aggregate) Regarding a reformed recycled asphalt mixture, penetration degree 60 was measured in 100 parts by weight of an aggregate mixture composed of 33 parts by weight of recycled aggregate (waste asphalt mixture), 28 parts by weight of large aggregate in 10 to 13 mm, fine aggregate of 10 mm or less, 4 to 6 parts by weight of straight asphalt of 100 to 100 parts by weight, 0.5 to 1 part by weight of a high boiling point crude cracked distillate extracted at a temperature of 400 ° C or higher and a pressure of 50 to 60 mmHg and 0.5 to 1 part by weight of waxes, 55.3 to 62% by weight of waste tire rubber powder which is a rubber-based resin polymer (CRM) for a regenerated asphalt mixture heated to 160 ° C, The composition of the present invention is characterized in that it contains 26.3 to 33 wt% of a polyphenylene oxide (LDPE) fine powder, 2.5 to 3 wt% of a modified olefin as a compatibilizer, 4 to 4.5 wt% of carbon black, 0.5 to 1 wt% of calcium hydroxide, 0.5 to 1 wt% Modified asphalt mixture prepared by adding 0.5 to 1.5% by weight of a modified additive composition comprising 0.8 to 0.8% by weight of an ultraviolet absorber, 0.3 to 0.6% by weight of an ultraviolet absorber, 0.2 to 0.5% by weight of an antioxidant, and 0.2 to 0.3% by weight of a dispersant .

The addition of straight asphalt is essential for the regenerated asphalt mixture described above. A large amount of asphalt is lost from the originally designed asphalt mixture to the waste asphalt mixture (waste asbestos aggregate) through a public period. Particularly, it has a high abrasion loss due to vehicle at low temperature and rapidly forms a film having a thickness of 4 to 5 microns on the surface of the asphalt road by ultraviolet ray. When the film is formed, it absorbs oxygen and disrupts the loss of volatile substances. Is easily dissolved in the storm, is lost together with the storm, and the new asphalt surface is exposed. Such a phenomenon is repeated and a large amount of asphalt is lost, so it is necessary to replenish the asphalt.

In addition, due to the repetitive photooxidation of ultraviolet rays, the fine aggregates and fillers are small and fine, so they are lost together with the good. Also, due to oxidation of the asphalt, the adhesion is weakened and peeling phenomenon occurs, There is a very large loss of fissure and chewing gum. Thus, the loss of asphalt and aggregate material can easily be estimated from the surface of the asphalt after 5 years of use in FIG.

And the material lost in the asphalt mixture is lost due to the loss of material due to volatilization, so that the volatiles contained in the asphalt are lost, so that the asphalt becomes harder and the penetration becomes lower, and the asphalt of the waste can fall to 2 or less. Such waste asphalt can greatly increase the penetration when it is heated by supplementing the volatile oil component. The oil added in the present invention is a decomposed distillate of crude oil extracted at a temperature of 400 ° C or higher under reduced pressure and can be hardened by decomposition distillate which is not readily evaporated when added to a recycled asphalt mixture because of a high boiling point.

Other materials that are lost in the asphalt mixture are osmotic materials, which are alkylnaphtha and alkylaromatics contained in asphalt. They can be called waxy materials. They are permeable to porous aggregate contained in the asphalt mixture or integrated on the asphalt surface Asphalt is penetrated into dust or soil particles and the osmotic material of the asphalt is lost. When such components are reduced, the asphalt begins to harden, the asphalt penetration decreases, the softening point becomes higher, and the elasticity is lost and hardened.

As the above materials or materials are lost, the waste asphalt mixture (recycled aggregate) will remain coarse aggregate and the waste asphalt mixture with an intrinsic degree of 2 or less, which is extremely deteriorated in physical properties and functionality. By adding the above-mentioned materials and materials to such a waste asphalt mixture, it is possible to obtain a modified regenerated asphalt mixture having a general asphalt mixture level.

When the rubber-based resin powder (waste tire powder), which is most commonly used in the modified asphalt composition added to the modified and regenerated asphalt mixture, is added to the asphalt, it has a high viscosity at a high temperature and a low rigidity at a low temperature. And the low stiffness at low temperature can increase the crack resistance generated at low temperature and reduce the change of the penetration of asphalt.

The low-density polyethylene is a semi-crystalline polymer having a density of about 0.91-0.93 in the ethylene polymer, and does not lose its ductility even at -50 占 폚 because of excellent heat bonding and cold resistance.

Once molten, there is no significant change in viscosity, and it is one of general-purpose resins having chemical stability and high tensile strength because of good processability and moldability, which is a great help to improve tensile strength in asphalt modification. Carbon black is manufactured by collecting soot generated by incomplete combustion of natural gas tar or the like or pyrolyzing them, which is used for imparting rigidity and heat resistance properties to an asphalt mixture. In particular, it has a function of blocking light rays, It is possible to have light resistance as an additive and to reduce oxidation caused by light on the surface of the lens.

Since the modified olefin resin is a low cost and non-polar polymer as a compatibilizing agent, the compatibility with the aggregate and other compositions is improved and the adhesive strength can be greatly improved.

The calcium hydroxide reacts with the carboxylic acid present in the asphalt to attach other carboxyl groups such as ketone to the aggregate surface. Since such a composition is not removed by water, it can reduce desorption of the asphalt and also contain calcium hydroxide If water is present between the aggregate and the asphalt in the mixture, calcium hydroxide is formed. This calcium ion in the aqueous solution causes the surface of the aggregate to become alkaline and electrochemically balance moisture from the aggregate surface to adhere to the surface of the agglomerate of the asphalt aggregate. In this case, the calcium hydroxide remains in the asphalt or calcium hydroxide solution. This mechanism weakens the adhesion force of the asphalt mixture due to the penetration of water, thereby preventing the peeling of the asphalt and the aggregate.

Organic manganese improves the physical properties such as dynamic stiffness, resistance by plastic deformation and Marshall stability by improving the temperature sensitivity of asphalt.

As with most other organic materials, the curing mechanism by oxidation oxidizes slowly when exposed to heat or air, and reacts with particles with highly active molecules to increase the viscosity of the asphalt. A material having a high activity, such as a hydroxyl group, a carbon group and a carbonic acid group, becomes a more complex molecule that hardens the asphalt and reduces flexibility, thereby losing viscoelasticity, which is a basic property of asphalt.

Oxidation of asphalt is mainly caused by heat or ultraviolet rays. As the antioxidant to be used, at least one antioxidant selected from hydroquinone monomethyl-ether, amyl butyl hydroquinone triphosphite and triphenyl phosphate is used.

The antioxidant is added in order to prevent the aging of the waste tire powder used as the above-mentioned modified composition, and its function is mainly to absorb the ultraviolet rays that cause photo-oxidation. Specifically, the antioxidant is decomposed into a stable material in the vertical state It reacts with peroxide radicals to change to an inert material or reacts with a substance produced by radical stopping reaction and changes into a substance acting as the original antioxidant or other antioxidant. In particular, as an antioxidant having an excellent antioxidizing function on a waste rubber, it can be called a 2-mercaptobenzoimidazole.

As the ultraviolet absorber, at least one ultraviolet absorber selected from phenyl salicylate, p-octylphenyl salicylate, P-t-butyl salicylate and benzophenone is used.

The ultraviolet absorber is a modifying additive that absorbs ultraviolet rays of 290 to 400 mμ to change harmless energy to prevent the formation of free radicals. In particular, the packaging material of the asphalt mixture is exposed to all weather conditions and the oxidation rate is increased during the hot summer season. As described above, photo-oxidation by ultraviolet rays rapidly forms a film having a thickness of 4 to 5 microns on the surface of the asphalt film. It prevents volatilization. However, the oxides of such coatings are easily dissolved in excellence, they are peeled off and exposed to fresh asphalt surfaces, and since such phenomena continue to be repeated, loss of asphalt is large and fine aggregates and bamboo materials adhered to asphalt are also excellent. The ultraviolet absorber can be said to be a necessary modifying additive for the modified asphalt composition.

In addition, alkylnaphthalene sulfonate, alkylbenzene sulfonate, and lignin sulfonate are used as dispersants, and they can ensure homogeneity when mixing the regenerated asphalt mixture and the modifying additive composition, and improve adhesion of asphalt to aggregate.

In particular, the dispersant of the sulfonate salt improves the workability and can reduce the excess fluidity of the asphalt at high temperatures in summer.

The modified regenerated asphalt mixture may be obtained by adding 0.5 to 1.5% by weight of a modifying additive to the above-mentioned heat regenerated asphalt mixture and heating the mixture at a temperature of 140 to 160 ° C.

The modified recycled asphalt mixture according to the present invention is free from any differences in physical properties and functions compared with a general asphalt mixture obtained by using general asphalt (AP-5) satisfying the asphalt grade specification, and can be applied on site. The modified recycled asbestos packing material to which the modified asphalt mixture is added to the recycled asphalt mixture may be said to be a modifying additive capable of obtaining a level of PG 76-22 on the basis of the compatibility level.

In order to clarify the technical structure of the present invention and to examine its quality, the embodiments of the present invention and comparative examples will be described.

Example (1)

33kg of recycled aggregate, 3.2kg of straight asphalt in the range of 80 to 100 in 100kg of aggregate composed of 28kg of new large aggregate in 10 ~ 13mm, 34kg of fine new material less than 10mm, and 5kg of impregnation, 0.5kg of cracked distillate (oil) And 0.5 kg of wax were heated to 150 DEG C to obtain a regenerated asphalt mixture. To the regenerated asphalt mixture in which the temperature remained unchanged, 60 wt% of waste tire rubber powder, 31 wt% of LDPE, 2.5 wt% of compatibilizer, 0.7 wt% of a modifying additive composed of 4 wt% of carbon black, 0.5 wt% of calcium hydroxide, 0.5 wt% of organic manganese, 0.5 wt% of an antioxidant, 0.4 wt% of an ultraviolet absorber, 0.3 wt% of an antioxidant and 0.3 wt% Asphalt mixture (A) was obtained.

Comparative Example (1)

The asphalt mixture (B) was obtained by adding 6.4 kg of fresh asphalt to 100 kg of aggregate composed of 42 kg of coarse aggregate, 53 kg of fine aggregate, and 5 kg of benthic material and heating at a temperature of 150 캜.

Comparative Example (2)

4 kg of new asphalt was added to 100 kg of aggregate composed of 33 kg of recycled aggregate, 28 kg of large aggregate, 34 kg of fine aggregate and 5 kg of bending material and heated to 150 ° C to obtain a recycled asphalt mixture packing material (C).

(1) and Comparative Examples (1) and (2) were prepared according to the Asphalt Mixture Production and Construction Guideline 2009 (Ministry of Land Transportation Guideline, KSF 2349 (2010) and Korean Industrial Standard Recycled Asphalt The test results of Marshall stability, dynamic stability, tensile strength ratio, and asphalt pavementability (PG) were tested according to the test method of GRF 4005 (2009).

Comparison of quality of asphalt mixture Test Items Reference value Example (A) Comparative Example 1 (B) Comparative Example 2 (C) Marshall stability, MS (N) 7500 or more 10954 10240 10140 Dynamic stability, DS (times / mm) 750 or more 2545 1220 1295 Tensile strength ratio, TSR (-) 0.75 or more 0.78 0.76 0.75 Asphalt compatibility grade,
PG PG 58-22 or
PG 64-22 PG 76-22 PG 64-22 PG 58-22

Claims (2)

4 to 6 parts by weight of a straight asphalt having an intrusion degree of 60 to 100 to 33 parts by weight of a recycled aggregate, 28 parts by weight of a large aggregate of 10 to 13 mm, 34 parts by weight of a fine aggregate of 10 mm or less and 5 parts by weight of a filler, 0.5 to 1 part by weight of a high boiling point oil fraction which is a decomposed distillate extracted at a temperature of 400 DEG C or higher under a reduced pressure of 50 to 60 mmHg and 0.5 to 1 part by weight of waxes are added to the recycled asphalt mixture heated and melted at a temperature of 140 to 160 DEG C A mixture of 55.3 to 62 wt% of tire powder, 26.3 to 33 wt% of low density polyethylene, 2.5 to 3 wt% of compatibilizer, 4 to 4.5 wt% of carbon black, 0.5 to 1 wt% of calcium hydroxide, 0.5 to 1 wt% of organic manganese, And 0.5 to 1.5% by weight of a modified composition composed of 0.3 to 0.6% by weight of an ultraviolet absorber, 0.2 to 0.5% by weight of an antioxidant and 0.2 to 0.3% by weight of a dispersing agent.
The modified asphalt mixture according to claim 1, wherein the anti-aging agent is 2-heptyl benzoimidazole.

Images