KR101043032B1 - Manufacturing method of asphalt modifier and modified asphalt, modified asphalt concrete thereof - Google Patents

Abstract

PURPOSE: An asphalt modifier is provided to produce modified asphalt concrete through a simple process and to prevent plastic deformation and cracks, representative damage of asphalt pavement at high temperature. CONSTITUTION: A method for preparing an asphalt modifier comprises the steps of: mixing ethylene, polyolefin elastomer in which butane or octene is copolymerized, and low molecular weight polyethylene wax at 10~40 °C for 5~10 minutes to prepare a mixture; melting the mixture at 120~180 °C by a biaxial extruder to homogenize the mixture; cooling the mixture in water of 10~40 °C; and cutting the cooled mixture in a chip form.

Description

Asphalt modifiers and modified asphalt, including the same.Manufacturing method of asphalt modifier and modified asphalt, modified asphalt concrete

The present invention relates to an asphalt modifier and modified asphalt including the same, and modified asphalt concrete. The modified asphalt concrete can be produced by a simple process, and is capable of preventing plastic deformation and cracking, which are typical breakdowns of asphalt pavement at high temperatures. Asphalt modifiers and modified asphalt comprising the same, modified asphalt concrete.

In general, asphalt concrete is widely used in road paving or parking lot by mixing and mixing aggregates such as asphalt, coarse aggregate, fine aggregate, and pavement filler (limestone powder, cement, etc.). However, the asphalt contained in the asphalt concrete is sensitive to temperature changes, so the asphalt concrete pavement is a plastic deformation in the summer, which causes severe bending of the package, which in turn impedes the traffic of the vehicle, while the winter temperature suddenly drops. There was a problem that the cracks in the package greatly shorten the life of the package.

Asphalt modifier is used to improve the problems of asphalt concrete as described above. It has elasticity at high temperature in combination with asphalt to prevent plastic deformation in summer and flexibility at low temperature to prevent winter cracking and It increases the function of preventing aggregate desorption.

The method for producing modified asphalt concrete using asphalt modifier is largely divided into pre-mix type modified asphalt concrete and plant mix type modified asphalt concrete, and the pre-mix type reforming. Asphalt concrete is to prepare asphalt concrete by mixing the asphalt prepared by mixing the modifier in the asphalt in advance with the aggregate, and the plant mix type modified asphalt concrete, the modifier is directly added to the mixing mixer in the process of mixing the asphalt and aggregate. It is a method of manufacturing asphalt concrete by adding.

The pre-mix type modified asphalt concrete is prepared by adding a modifier to the asphalt in advance, and then transported to and stored in an asphalt concrete plant, and heated to a constant temperature to produce asphalt concrete by mixing with aggregate. To this end, a separate storage facility is required for asphalt concrete companies, and there are limitations in producing small-scale asphalt concrete required for maintenance or small-scale construction.

The plant mix type modified asphalt concrete is prepared by directly adding the modifier to the asphalt concrete mixer to produce modified asphalt concrete. Because it does not need a separate storage equipment can be produced easily, it is also suitable for small quantity production.

Amide wax, LDPE powder, etc. are conventionally used as a plant mixing type modifier. However, amide waxes and LDPE powders improve the high-temperature properties of asphalt concrete by improving the properties of asphalt at temperatures above their softening point, that is, at high temperatures, but at low temperatures they harden asphalt to resist cracking at low temperatures. There was a problem of getting smaller.

The present invention is to solve the problems of the prior art is to provide an asphalt modifier that can be easily prepared by preparing the particles in the form of particles to be easily dispersed in the asphalt and aggregate.

It is also an object of the present invention to provide a modified asphalt using the above asphalt additive.

Another object of the present invention is to provide a modified asphalt concrete having improved resistance to plastic deformation at high temperatures, resistance to low temperature cracking at low temperatures, and resistance to fatigue cracking due to repeated vehicle loads. .

The present invention provides an asphalt modifier, characterized in that 50 to 95% by weight of polyolefin elastomer copolymerized with ethylene and butene or octene and 5 to 50% by weight of low molecular weight polyethylene wax are mixed.

In addition, the polyolefin elastomer provides an asphalt modifier, characterized in that the density 0.850 ~ 0.915g / cm 3, the melt index (Melt Index 190 ℃, 2.16kg) is 0.5 ~ 30.

In addition, the low molecular weight polyethylene wax provides an asphalt modifier, characterized in that the weight average molecular weight is 5000 ~ 10000 and the softening point is 95 ~ 120 ℃.

In addition, the present invention is a method for producing an asphalt modifier, a first mixing step of preparing a mixture by stirring a polyolefin elastomer copolymerized with ethylene, butene or octene and a low molecular weight polyethylene wax for 10 to 40 ℃, 5 to 10 minutes ; A second mixing step of melting the mixture at 120 to 180 ° C. with a twin screw extruder and homogeneously mixing the mixture; A cooling step of cooling the mixture in water at 10 to 40 ° C; And a cutting step of cutting the cooled mixture into chips.

In addition, the first mixing process provides an asphalt modifier manufacturing method characterized in that the stirring with a super mixer or Henschel mixer.

In addition, the low molecular weight polyethylene wax provides a method for producing asphalt modifier, characterized in that the viscosity is 150 ~ 550 cPs.

In addition, the present invention provides a modified asphalt comprising an asphalt modifier prepared by mixing 50 to 95% by weight of polyolefin elastomer copolymerized with ethylene and butene or octene and 5 to 50% by weight of low molecular weight polyethylene wax. .

In addition, the modified asphalt provides a modified asphalt, characterized in that produced by mixing 1 to 20% by weight asphalt modifier and 80 to 99% by weight asphalt.

In addition, it provides a modified asphalt concrete, characterized in that the pigment is further added to ensure visibility to the modified asphalt.

It provides a modified asphalt concrete, characterized in that the asphalt modifier, asphalt, aggregate is prepared by mixing 50 to 95% by weight of polyolefin elastomer copolymerized with ethylene and butene or octene and 5 to 50% by weight of low molecular weight polyethylene wax. .

In addition, the modified asphalt concrete provides a modified asphalt concrete, characterized in that it is prepared by mixing the aggregate as 0.05% to 2.0% by weight of asphalt modifier, 2.5 to 8.85% by weight of modified asphalt and the balance.

In addition, the modified asphalt concrete provides a modified asphalt concrete, characterized in that the asphalt modifier, asphalt, aggregate is prepared by mixing at 160 ~ 180 ℃.

In addition, the aggregate provides a modified asphalt concrete, characterized in that it comprises a recycled aggregate.

In addition, the modified asphalt concrete provides modified asphalt concrete, characterized in that it is produced in a low noise drainage at a porosity of 12 ~ 22%.

In addition, it provides an asphalt concrete pavement, characterized in that the pavement with the modified asphalt concrete.

In addition, it provides an asphalt concrete pavement characterized in that the coating on the package with a color paint.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

As used herein, the terms "about", "substantially", and the like, are used at, or in close proximity to, numerical values when manufacturing and material tolerances inherent in the meanings indicated are intended to aid the understanding of the invention. Accurate or absolute figures are used to assist in the prevention of unfair use by unscrupulous infringers.

1 is a manufacturing process of the asphalt modifier according to the present invention.

Asphalt modifiers of the present invention are made of low molecular weight ethylene waxes that facilitate mixing and dispersing with ethylene and butene or octene copolymerized polyolefin elastomers that improve the high and low temperature properties of asphalt.

The polyolefin elastomer may be a copolymer of ethylene and butene or octene, and a polyolefin elastomer having a density of 0.850 to 0.915 g / cm 3 and a melt index (Melt Index 190 ° C., 2.16 kg) of 0.5 to 30 may be used.

The greater the density, the greater the crystalline and melting point of the polyolefin elastomer, the greater the resistance to plastic deformation at high temperature, and the lower the density, the lower the glass transition temperature, the lower the resistance to low temperature cracking and fatigue cracking. It is preferable to have a density of 0.850 to 0.915 g / cm 3 since it becomes large.

The low molecular weight ethylene wax may be prepared by thermally decomposing low density polyethylene or by using by-products having a weight average molecular weight of 5000-10000, a softening point of 95-120 ° C., and a density of 0.93 g / cm 3 or less.

When the temperature above the melting point of the low molecular weight ethylene wax has a characteristic that the viscosity is sharply reduced, when mixing the aggregate, asphalt and modifier in the mixer to improve the processability when mixing the polyolefin elastomer and processing the modified concrete and to produce modified asphalt concrete Improve the meltability and blendability of the modifier

Asphalt modifier according to the present invention is prepared by mixing 50 to 95% by weight of polyolefin elastomer as described above and 5 to 50% by weight of low molecular weight polyethylene wax.

In addition, the present invention, the asphalt modifier manufacturing method is prepared by a first mixing process, a second mixing process, a cooling process, a cutting process as shown in FIG.

The first mixing step is a step of preparing a mixture by stirring polyolefin elastomer copolymerized with ethylene, butene or octene and low molecular weight polyethylene wax at 10 to 40 ° C. for 5 to 10 minutes.

It is preferable to mix the said 1st mixing process by stirring with a super mixer or a Henschel mixer. The supermixer can increase productivity because it can digest a large amount of mixture at a suitable temperature in a short time.

The second mixing step is a step of melting the mixture at 120 to 180 ° C. with a twin screw extruder and homogeneously mixing the mixture.

The low molecular weight polyethylene wax will preferably use a viscosity of 150 ~ 550 cPs for homogeneous mixing of the mixture in the first and second mixing process.

The cooling step is to cool the mixture in water of 10 ~ 40 ℃ solidify the mixture in water.

The cutting process is a process of cutting the cooled mixture into chips to form particles having a size of 2 to 8 mm. An extruder and an underwater cutter before the mixture is completely solidified in the cooling process. It may also be manufactured in pellet form using a device such as a cutter.

Asphalt modifier according to the present invention as described above is made of a polyolefin elastomer and a low molecular weight polyethylene wax that is a thermoplastic polymer can be used at a low temperature.

Modified asphalt and modified asphalt concrete may be prepared using the asphalt modifier prepared as described above.

When producing modified asphalt by using the asphalt modifier, it is preferable to prepare by mixing 1 to 20% by weight of asphalt modifier and 80 to 99% by weight of asphalt. When the mixing ratio of the asphalt modifier is less than 1% by weight, the effect of the asphalt modifier may be insignificant. When the mixing ratio of the asphalt modifier exceeds 20% by weight, the synergistic effect of the asphalt modifier may be insignificant and the economical efficiency may be reduced. Can be.

The asphalt modifier of the present invention is made of polyolefin elastomer, which is a thermoplastic polymer, and low molecular weight polyethylene wax, and is added to asphalt to produce modified asphalt having a performance grade.

In addition, titanium dioxide, iron oxide red or iron oxide yellow, chromium oxide, zinc oxide, etc., which have color to secure visibility of the modified asphalt. Inorganic pigments may be added, and the amount of the pigment may be added in an amount of 1 to 3% by weight of the modified asphalt weight.

As described above, the modified asphalt concrete using the modified asphalt of the present invention using an asphalt modifier is prepared by mixing 50 to 95 wt% of the polyolefin elastomer copolymerized with ethylene and butene or octene and 5 to 50 wt% of a low molecular weight polyethylene wax. Asphalt modifiers can be prepared as asphalt, aggregate.

Modified asphalt concrete of the present invention is to produce a modified asphalt by mixing the asphalt modifier and asphalt, and then to mix with the aggregate to produce a modified asphalt concrete, the asphalt modifier and the asphalt, the aggregate is added to the mixer to modify the present invention Asphalt concrete may be produced.

The modified asphalt concrete will be prepared by mixing the aggregate as 0.05 ~ 2.0% by weight asphalt modified agent, 2.5 ~ 8.85% by weight modified asphalt and the balance.

As the aggregate used in the modified asphalt concrete of the present invention, recycled aggregates made of waste asphalt concrete can be used.

The recycled aggregate produced from the waste asphalt concrete has been developed in recent years as a trend toward the recycling of resources, and now a considerable amount of the aggregate is using recycled aggregate manufactured from waste concrete or waste asphalt concrete.

The recycled aggregate that can be used in the present invention may be used by pulverizing waste asphalt concrete into a recycled aggregate made of waste asphalt concrete.

Asphalt modifier of the present invention can be recycled asphalt concrete using more recycled aggregates than the prior art by activating the waste asphalt contained in the recycled aggregate when mixed with the recycled aggregate in a thermoplastic nature.

When the recycled aggregate is used, the amount of recycled aggregate is preferably used in an amount of 10 to 90 wt% based on the total aggregate weight.

In addition, by adjusting the aggregate when producing the modified asphalt concrete of the present invention will be able to manufacture a modified asphalt concrete having a low noise, drainage of 12 to 22% porosity.

Modified asphalt concrete according to the present invention prepared as described above can be paved by the same method as the general asphalt concrete paving method to package the modified asphalt concrete pavement.

In addition, according to the surrounding environment of the bus lane, parking lot, walkway, children's protection area, etc., where the modified asphalt concrete pavement is packaged, it may be configured with a pavement color package suitable for the surrounding environment by coating with a color paint on the pavement. .

Asphalt modifier of the present invention prepared by the method as described above improves the physical properties of the asphalt and by adding a modification additive to the mixer during the manufacture of asphalt concrete by manufacturing asphalt concrete in a separate storage facility or expensive in general ascon plant It does not need to install the equipment of the production as it is produced as it is, there is no other additional cost in the production of the mixture.

In addition, by supplying modified asphalt concrete having excellent commonality, it is possible to reduce the national budget such as logistics cost, road maintenance, etc. by improving the lifespan and safety of road pavement, and provide a great effect in preventing traffic safety accidents.

1 is a manufacturing process of the asphalt modifier according to the present invention.

Hereinafter, an example of preparing an asphalt modifier of the present invention and modified asphalt using the same, and modified asphalt concrete, is not limited thereto.

Example 1

Among the polyolefin elastomers copolymerized with ethylene and octene, 90 parts having a density of 0.895 g / cm 3 and a melt index of 3 (Melt Index 190 ° C, 2.16 kg) and 10 parts of polyethylene wax having a softening point of 110 ° C and a viscosity of 400 cPs at 140 ° C Mixing process at room temperature for 5 minutes with a super mixer, mixing it homogeneously by processing it at 140 ℃ using a twin screw extruder, and cooling it in water at room temperature and cutting it into 3 ~ 8mm length and 2 ~ 5mm diameter. Asphalt modifier prepared through the process was prepared.

Asphalt modifiers prepared as described above were mixed with 2% of asphalt having a penetration degree of 60 to 80 to prepare modified asphalt to measure physical properties as asphalt for road pavement.

In addition, 95.0% of the aggregate adjusted to the surface WC-3 particle size specified in KS F 2349 and 0.10% of the modifier prepared on 4.90% of the asphalt having a penetration of 60 to 80 were added to the mixing mixer and mixed at 170 ° C. for 60 seconds. The modified asphalt concrete was prepared and compacted on both sides with Marshall compactor at 150 ° C. on both sides to produce a test specimen for Marshall test. A slab specimen with a thickness of 5 cm was fabricated using a slab compactor at 150 ° C. for dynamic stability test. .

Example 2

Among the polyolefin elastomers copolymerized with ethylene and octene, 60 parts having a density of 0.885 g / cm 3 and a melt index (Melt Index 190 ° C, 2.16 kg) of 1, a density of 0.864 g / cm 3 and a melt index (Melt Index 190 ° C., 2.16kg) with 13 parts of 30 parts and 10 parts of polyethylene wax having a softening point of 110 ° C. and a viscosity of 200 cPs at 140 ° C. in a supermixer for 5 minutes at room temperature and melted at 140 ° C. using a twin screw extruder. Asphalt modifier was prepared through the process of homogeneously mixing and the process of cooling in water at room temperature and the process of cutting to length 3 ~ 8mm, diameter 2 ~ 5mm.

 Asphalt modifiers prepared as described above were mixed with 3% of the asphalt having a penetration of 60 to 80 to prepare modified asphalt to measure physical properties as asphalt for road pavement.

In addition, 95.0% of the aggregate adjusted to the surface WC-3 particle size prescribed in KS F 2349 and 0.15% of the modifier prepared on 4.85% of the asphalt having a penetration of 60 to 80 were added to the mixing mixer and mixed at 170 ° C. for 60 seconds. The modified asphalt concrete was prepared and compacted on both sides with Marshall compactor at 150 ° C. on both sides to produce a test specimen for Marshall test. A slab specimen with a thickness of 5 cm was fabricated using a slab compactor at 150 ° C. for dynamic stability test. .

Example 3

Among the polyolefin elastomers copolymerized with ethylene and octene, 45 parts having a density of 0.885 g / cm 3 and a melt index (Melt Index 190 ° C, 2.16 kg) of 1, a density of 0.864 g / cm 3 and a melt index (Melt Index 190 ° C., 2.16) kg) of 13 and 45 parts of softening point and 10 parts of polyethylene wax having a viscosity of 400 cPs at 110 ° C. and 140 ° C. are mixed in a supermixer at room temperature for 5 minutes using a twin screw extruder and melted at a processing temperature of 140 ° C. for homogeneity. Asphalt modifier was prepared through the mixing process and the process of cooling in water at room temperature and the process of cutting to 3-8mm in length, 2-5mm in diameter.

Asphalt modifier prepared as described above was mixed 5% to asphalt having a penetration degree of 60 ~ 80 to prepare a modified asphalt to measure the physical characteristics as road paving asphalt.

In addition, 95.0% of the aggregate adjusted to the surface WC-3 particle size specified in KS F 2349 and 0.25% of the modifier prepared on 4.75% of the asphalt having a penetration of 60 to 80 were added to the mixing mixer and mixed at 160 ° C. for 60 seconds. The modified asphalt concrete was prepared and compacted on both sides with Marshall compactor at 150 ° C. on both sides to produce a test specimen for Marshall test. A slab specimen with a thickness of 5 cm was fabricated using a slab compactor at 150 ° C. for dynamic stability test. .

Example 4

Among the polyolefin elastomers copolymerized with ethylene and butene, 50 parts having a density of 0.88 g / cm 3 and a melt index of 0.8 (Melt Index 190 ° C, 2.16 kg) and a density of 0.865 g / cm 3 and a melt index of Melt Index 190 ° C, 2.16 kg) is 5 parts 40 parts and softening point of 110 ℃ and a polyethylene wax 10 parts supermixer with a viscosity of 400 cPs at 140 ℃ 5 minutes mixing at room temperature for 5 minutes and using a twin screw extruder melted at a processing temperature of 140 ℃ homogeneous Asphalt modifier was prepared through the mixing process and the process of cooling in water at room temperature and the process of cutting to 3-8mm in length, 2-5mm in diameter.

Asphalt modifier prepared as described above was mixed 7% to asphalt having a penetration of 60 ~ 80 to prepare a modified asphalt to measure the physical properties as asphalt for road paving.

In addition, the modified asphalt concrete was mixed by mixing 94.7% of the aggregate adjusted to a 13 mm particle size and 0.35% of the cellulose fiber and 0.3% of the cellulose fiber prepared on 4.65% of the asphalt having a penetration of 60 to 80 and mixing at 170 ° C. for 60 seconds. The test specimen was prepared 50 times on both sides with a Marshall compactor at 150 ° C., and a test specimen for Marshall was prepared. A slab specimen having a thickness of 5 cm was manufactured at 150 ° C. using a slab compactor.

Comparative Example 1

Asphalt of 60 ~ 80 penetration level used in general pavement was measured as physical property of road paving asphalt. In addition, 95.0% of the aggregate adjusted to the surface WC-3 particle size prescribed in KS F 2349 and 5.0% of the asphalt having 60 to 80 penetration were added to the mixing mixer to produce modified asphalt concrete by mixing at 160 ° C. for 60 seconds. Then, the test specimen for Marshall was compacted 75 times on both sides with a Marshall compactor at 140 ° C., and a slab specimen having a thickness of 5 cm was fabricated at 140 ° C. using a slab compactor.

Comparative Example 2

SBS modified asphalt, PG 76-22, was measured for physical properties as asphalt pavement. In addition, 95.0% of aggregate adjusted to surface WC-3 particle size prescribed in KS F 2349 and 5.0% of SBS modified asphalt, PG 76-22, were added to the mixing mixer, and the modified asphalt concrete was mixed by mixing at 170 ° C. for 60 seconds. Then, the test specimen for Marshall was compacted 75 times on both sides with a Marshall compactor at 150 ° C., and a slab specimen having a thickness of 5 cm was fabricated using a slab compactor at 150 ° C., and the dynamic stability test was performed.

Comparative Example 3

SBS modified asphalt, PG 82-22, was measured for physical properties as asphalt pavement. 94.7% aggregate adjusted to 13mm low noise drainage granularity, 5.0% SBS modified asphalt with PG 82-22 and 0.3% cellulose fiber were added to the mixing mixer and mixed for 60 seconds at 170 ° C. to produce modified low noise drainage asphalt concrete, 150 The test specimen was prepared by marshalling 50 times on both sides with a Marshall compactor, and a slab compactor with a thickness of 5 cm was fabricated using a slab compactor at 150 ° C.

The modified asphalt mixed with the asphalt modifier prepared in the above examples, and the asphalt and the SBS modified asphalt of the comparative example were evaluated for the viscoelastic properties indicating the mechanical properties and the paveability as road asphalt, respectively. The basic physical properties of packaging binders such as penetration and elongation, dynamic shear test for aging after raw binder and thin film heating test, and aging characteristics after aging test, and common grade according to KS F 2389 were evaluated. It is shown in the physical property evaluation result.

Evaluation items Exam name Test equipment Test Methods basic
Physical properties Softening point Softening point testing machine KS M 2250 Trespassing Penetration tester KS M 2252 Shinto Elongation tester KS M 2254 Viscoelastic properties Dynamic shear stress Dynamic Shear Rheometer (DSR) KS F 2393
KS M 2259
KS F 2391 Dynamic Shear Stress after Thin Film Heating Test Dynamic shear stress after high pressure aging test Bending creep stiffness Prosthetic Rheometer (BBR, Bending)
Beam Rheometer KS F 2390 inclination Common grade KS F 2389

The dynamic shear stress (G ^* / sin δ, G ^* : composite shear stress, δ: phase angle) must be large for the resistance to plastic deformation of road paving asphalt.

In the present invention, the dynamic shear stress (G ^* / sin δ) at 64, 70, 76, 82 ℃ to measure the resistance to plastic deformation at high temperature, respectively, and to measure the fatigue crack resistance in the intermediate temperature range The flexural creep stiffness and slope were measured at -12 ° C to measure the dynamic shear stress (G ^* sinδ) at low temperatures and the crack cracking resistance at low temperatures.

Test Items Test temperature Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Softening point, ℃ - 68.5 74.6 79.8 83.7 47.5 72.4 87.3 Penetration rate, 1/10 mm 25 ℃ 66 61 55 51 73 55 46 Elongation, cm 15 ℃ 86 82 80 76 150 (25 degrees Celsius) 78 78 Dynamic shear stress
(G ^* / sinδ), ㎪ 64 ℃ - - - - 1.06 - - 70 ℃ 1.48 - - - 0.538 - - 76 ℃ 0.83 1.30 2.59 2.97 - 1.54 2.48 82 ℃ - 0.70 1.37 1.83 - 0.87 1.67 After thin film heating
Dynamic shear stress
(G ^* / sinδ), ㎪ 64 ℃ - - - - 2.69 - - 70 ℃ 3.17 - - - 1.23 - - 76 ℃ 1.58 2.74 4.27 4.73 - 2.54 3.26 82 ℃ - 1.35 2.25 3.28 - 1.68 2.43 Dynamic shear stress after high pressure aging test
(G ^* sinδ), ㎪ 22 ℃ - - - - - - - 28 ℃ - - - - 2538 - - 31 ℃ 37 2010 - - - 928 - 34 ℃ - - 1027 1349 - - 2832 Bending creep stiffness -12 ℃ 246.4 236.1 219.5 213.6 289.1 232.7 169.5 inclination -12 ℃ 0.334 0.327 0.327 0.323 0.322 0.384 0.360 PG rating 70-22 76-22 82-22 82-22 64-22 76-22 82-22

In addition, the asphalt concrete prepared in Examples and Comparative Examples were subjected to the resistance test against plastic flow of asphalt mixture using KS F 2337, Marshall tester and wheel tracking test of KS F 2374, bitumen pavement mixture, respectively. Plastic deformation resistance of was evaluated. The results are shown in Table 3 below.

Test Items Reference value Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Stability (N) More than 7500 11153 11837 11823 - 10537 11382 - More than 5000 - - - 6856 - - 6382 Porosity (%) 3 ~ 6 4.1 3.9 4.0 - 4.1 4.2 More than 20 - - - 20.2 - - 20.1 Flow value (1/100 cm) 20-40 31 28 33 27 32 29 30 Tensile Strength Ratio 0.75 or more 0.82 0.80 0.83 - 0.79 0.82 - Cantabro Loss Rate
(%) 20 or less - - - 8.9 - - 9 Permeability coefficient (/ sec) 1x10 ^-2 or more - - - 4.50x10 ^-2 - - 4.20 x 10 ^-2 Dynamic stability
(Times / mm) 750 or more 3495 4351 5127 5298 1334 4328 5034

As shown in the physical property test results of the asphalt binder as shown in Table 2, the softening point showing general physical properties was greatly increased as compared with the asphalt (Comparative Example 1) generally used, and it was found that the dynamic shear stress indicating the plastic deformation was greatly improved. have. In addition, it can be seen that the physical properties equivalent to those of SBS modified asphalt (Comparative Example 2) widely used as a pre-mixed modified asphalt.

In addition, the general grade (Example) is 64-22 in the common grade, which shows the commonity of the asphalt mixture for road pavement, and each example is greatly improved as 70-22 or 76-22 or 82-22. It can be seen that it is equivalent to the widely used SBS modified asphalt (Comparative Example 2).

The resistance test for plastic flow of asphalt mixture using KS F 2337, Marshall tester of Table 3, and the wheel tracking test results of KS F 2374, bitumen pavement mixture were compared with those of asphalt concrete prepared using general asphalt (Comparative Example 1). It shows excellent physical properties, and shows the same physical properties as compared with asphalt concrete (Comparative Example 2) prepared using SBS modified asphalt which is widely used as a pre-mixed modified asphalt. Moreover, even when comparing the performance (Example 4, Comparative Example 2) as a drainage packaging, it turns out that it shows the same physical property.

Claims (16)

Asphalt modifier, characterized in that 50 to 95% by weight of polyolefin elastomer copolymerized with ethylene and butene or octene and 5 to 50% by weight of low molecular weight polyethylene wax. The method of claim 1,
The polyolefin elastomer has a density of 0.850 ~ 0.915g / ㎠, melt index (Melt Index 190 ℃, 2.16kg) is an asphalt modifier, characterized in that 0.5 ~ 30. The method of claim 2,
The low molecular weight polyethylene wax has a weight average molecular weight of 5000 ~ 10000 and the asphalt modifier, characterized in that the softening point is 95 ~ 120 ℃. Asphalt modifier manufacturing method,
A first mixing step of preparing a mixture by stirring a polyolefin elastomer copolymerized with ethylene, butene or octene and a low molecular weight polyethylene wax for 10 to 40 ° C. for 5 to 10 minutes;
A second mixing step of melting the mixture at 120 to 180 ° C. with a twin screw extruder and homogeneously mixing the mixture;
A cooling process of cooling the mixture in water at 10 to 40 ° C, and
Asphalt modifier manufacturing method comprising a cutting step of cutting the cooled mixture in the form of chips. The method of claim 4.
The first mixing process is a asphalt modifier manufacturing method characterized in that the stirring with a super mixer or Henschel mixer. The method of claim 4, wherein
The low molecular weight polyethylene wax has a viscosity of 150 ~ 550 cPs asphalt modifier manufacturing method, characterized in that. A modified asphalt comprising an asphalt modifier prepared by mixing 50 to 95 wt% of polyolefin elastomer copolymerized with ethylene and butene or octene and 5 to 50 wt% of low molecular weight polyethylene wax. The method of claim 7, wherein
The modified asphalt is modified asphalt, characterized in that prepared by mixing 1 to 20% by weight asphalt modifier and 80 to 99% by weight asphalt. The method of claim 7, wherein
Modified asphalt concrete, characterized in that to further add a pigment to ensure the visibility to the modified asphalt. Modified asphalt concrete, characterized in that the asphalt modifier, asphalt, aggregate is prepared by mixing 50 to 95% by weight of polyolefin elastomer copolymerized with ethylene and butene or octene and 5 to 50% by weight of low molecular weight polyethylene wax. The method of claim 10,
The modified asphalt concrete is modified asphalt concrete, characterized in that the asphalt mixture is prepared by mixing the aggregate as 0.05 to 2.0% by weight, modified asphalt 2.5 to 8.85% by weight and the balance. The method of claim 10,
The modified asphalt concrete is modified asphalt concrete, characterized in that to manufacture by mixing the asphalt modifier, asphalt, aggregate at 160 ~ 180 ℃. The method of claim 10,
The aggregate is modified asphalt concrete, characterized in that it comprises a recycled aggregate. The method of claim 10,
The modified asphalt concrete is modified asphalt concrete, characterized in that it is produced with low noise drainage at a porosity of 12 ~ 22%. Asphalt concrete pavement, characterized in that the pavement with modified asphalt concrete of claim 10. 16. The method of claim 15,
Asphalt concrete pavement, characterized in that the coating on the package with a color paint.

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