KR20170069139A - Additive composition for an Warm-Mix, Modified Recycling Asphalt Mixture and the Asphalt Mixture Made by addition of the Same - Google Patents

Abstract

The present invention relates to a mesophilic recycled modified asphalt mixture, more specifically, 360 to 600 parts by weight of modified sulfur; 60 to 90 parts by weight of at least one polymer material selected from the group consisting of ethylene vinyl acetate (EVA), epoxy resin, polypropylene, and polyurethane; 4 to 5 parts by weight of carbon black, 2 to 4 parts by weight of a compatibilizing agent, and 0.5 to 1 part by weight of a dispersing agent is used as the intermediate-temperature-type recycled modified asphalt mixture. Temperature type recycled modified asphalt mixture which can be manufactured by providing the asphalt mixture which is highly resistant to the damage of the ascon road pavement such as plastic deformation in summer and low temperature crack in winter and can realize the reduction of the amount of existing binder, The present invention relates to a mesophilic recycled modified asphalt mixture using a polymer and a modified sulfur.

Description

[0001] The present invention relates to an asphalt additive composition and a mesophilic recycled modified asphalt mixture prepared by adding the same to a mixture of an asphalt additive and a modified recycled modified asphalt mixture.

The present invention relates to a mesophase recycled modified asphalt mixture, and more specifically, it provides an asphalt mixture which is resistant to ascon road pavement damage such as plastic deformation during summer and low temperature crack during winter, The present invention relates to a mixture of a low-melting-point polymer and a mesophilic recycled modified asphalt using a modified sulfur, which has an effect of providing a mesophilic recycled-reformed asphalt mixture which can be produced by minimizing the amount of generated carbon dioxide.

In 2005, according to the "Act on the Promotion of Recycling of Construction Waste", the obligation to recycle construction waste such as sand, concrete, and asphalt concrete, which is discharged to above a certain level, has been announced, but most of them still rely on simple landfill. It is urgent to improve the technical, economic and institutional conditions for Recently, the Ministry of Environment plans to raise the recycled asphalt mixture to 13% of the waste asbestos by 2011 to the level of advanced countries (more than 50%) by 2020 through the establishment of an institutional basis for the activation of the recycled heated asphalt mixture. (2009.08), the Ministry of Land, Transport and Maritime Affairs, which established quality performance standards based on the results of research on the development of Korean type packaging design method and the improvement of packaging performance, has completed revision of national standard for recycled hot asphalt mixture (GR F 4005) (2009.11) and the existing asphalt mixture for heating (KS F 2349) were revised to add and refine the quality performance and quality standards in accordance with the reality of domestic Ascon road pavement. (2010.10).

As a result of the increase in the length of Ascon pavement roads and the aging of the pavement in the common year of the pavement, the road pavement using the domestic asphalt mixture shows a tendency to increase with the high rate of yearly (Ministry of Land, Transport and Maritime Affairs, 2010) The road extension ratio accounts for 70%, and the road extension ratio with 20 years or more of the public year is about 20%, which shows the annual increase trend continuously (Institute of Construction Technology, 2001). The cost of maintaining and repairing Ascon pavement in Korea is rapidly increasing every year due to factors such as quantitative increase of packing rate. The expenditure of enormous pavement maintenance and repair expenses is due to increase in public training of roads, rapid increase of road traffic volume, This is caused by an increase in damage. The aging of the existing Ascon pavement has caused various types of pavement problems with the increase of waste asbestos ashes. Most of the Ascon paved roads have plastic deformation (rut), pot holes, shoving and cracks in the early stages, which shortens the pavement life to less than 5 years. Costs and environmental problems for the disposal of waste asbestos generated from large scale repair and repackaging of ascon packaging are becoming serious issues.

As a result of the recent agreement on climate change (2015, Paris, France), government policy directions for carbon abatement manufacturing technology have been set up in domestic and foreign countries. Development of abatement technology for minimizing the use amount is needed.

This reality has led to interest in the development of recycled waste asbestos and the development of additives that can exhibit the regenerating and modifying effects of aged properties. In order to increase the recycling rate of recycled asbestos in Korea and to improve the quality of recycled mixtures, researches are continuously carried out. (ASTEN, Korea, 1996), a method of transporting recycled asbestos ash to a plant (SEA CONSTRUCTION CO., 1997), construction waste recycling A study on the quality improvement method for improving the life of recycled asphalt pavement (Ministry of Construction & Transportation, Korea Construction & Transportation Technology Evaluation Institute, 2005), Study on asphalt modification by light (Kang, Although various studies have been conducted on recycled mixtures such as the evaluation of the basic properties of semi-high temperature regenerated asphalt concrete (Kim Nam-ho, 2010), there is a continuing need to improve the recycling ratio of recycled asbestos and quality improvement of recycled mixtures.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the related art, and has the following objectives.

The present invention is based on the existing heated asphalt mixture to increase the usage of waste asbestos, and to enhance the resistance to ascon road pavement damage such as plastic deformation in summer and cold crack in winter, the additive recycled from the waste polymer material is mixed with asphalt, (PG76-22 or higher) of the asphalt mixture.

In order to reduce the production temperature (20 ° C. to 40 ° C.), to reduce the use amount of petroleum energy by 30% or more, and to improve the quality performance (stability, dynamic stability, etc.) of the asphalt mixture, modified sulfur such as sulfur polymer, The present invention aims at providing a mesophilic recycled modified asphalt mixture which can be produced by reducing a used amount of a binder and minimizing the amount of produced energy use and carbon dioxide generated by replacing a certain portion of the recycled asphalt mixture.

The present invention further aims to provide a modified asphalt mixture having a quality such as Marshall stability, dynamic stability, and cooperability grade disclosed by existing Ascon products.

In order to achieve the above object, the present invention is implemented by the following means.

The present invention relates to an asphalt recycled aggregate comprising 30 to 50 parts by weight of recycled aggregate, 30 to 50 parts by weight of crushed coarse aggregate as natural aggregate, 20 to 40 parts by weight of crushed fine aggregate as natural aggregate, 2 to 10 parts by weight of filler, 1.0 to 1.5 parts by weight of an asphalt modifier additive composition and 2.3 to 4.0 parts by weight of a new asphalt additive composition is further comprised of 1.0 to 2.5 parts by weight of an asphalt modifying additive composition and the asphalt is produced at a middle temperature of 120 to 140 ° C Is a mesophilic regenerated modified asphalt mixture using asphalt recycled aggregates.

The asphalt asphalt modifying additive composition comprises 360 to 600 parts by weight of modified sulfur; 60 to 90 parts by weight of at least one polymer material selected from the group consisting of ethylene vinyl acetate (EVA), epoxy resin, polypropylene, and polyurethane; 4 to 5 parts by weight of carbon black, 2 to 4 parts by weight of a compatibilizing agent, and 0.5 to 1 part by weight of a dispersing agent. Preferably, the polymer material is ethylene vinyl acetate (EVA), and the asphalt additive composition may further comprise 60 to 90 parts by weight of waste tire fine powder.

The present invention has the following effects with the above-described configuration.

The present invention provides an asphalt mixture which is highly resistant to breakage of ascon road pavement such as plastic deformation in summer and low temperature crack in winter by mixing additive recycled with polymeric material into asphalt, and it is possible to reduce the amount of used binder, Temperature type recycled modified asphalt mixture which can be produced by realizing minimization.

The Applicant hereunder explains in detail the means for solving the foregoing problem. The detailed description of known technology, which is considered to be unnecessarily obscured by the gist of the present invention, will be omitted. Hereinafter, the specific composition will be described.

<Asphalt Composition>

The present invention relates to an asphalt recycled aggregate comprising 30 to 50 parts by weight of recycled aggregate, 30 to 50 parts by weight of crushed coarse aggregate as natural aggregate, 20 to 40 parts by weight of crushed fine aggregate as natural aggregate, 2 to 10 parts by weight of filler, 1.0 to 1.5 parts by weight of an asphalt modifier additive composition and 2.3 to 4.0 parts by weight of a new asphalt additive composition is further comprised of 1.0 to 2.5 parts by weight of an asphalt modifying additive composition and the asphalt is produced at a middle temperature of 120 to 140 ° C Is a mesophilic regenerated modified asphalt mixture using asphalt recycled aggregates.

aggregate

The grain size or quality of aggregate used in asphalt concrete is in accordance with KS F 2357 standard for coarse aggregate and fine aggregate for bituminous packing. KS F 2357 is a Korean industrial standard for 'aggregate for bituminous packing mixture', which specifies quality of aggregate and grain size of coarse aggregate and fine aggregate.

The coarse aggregate is preferably crushed aggregate (crushed stone), crushed slag, crushed gravel and the like, preferably not containing harmful substances such as clay, silt and organic matter (see KS F 2357 specification). Fine aggregates are crushed sand (screenings) obtained by breaking rocks, gravel and the like, natural sand or a mixture thereof, and preferably do not contain harmful substances such as dust, clay and organic matter (see KS F 2357 specification). The aggregate of the present invention can suitably use coarse aggregate and / or fine aggregate depending on the specific application to which the asphalt composition is applied, the manufacturer, the mountain area and characteristics of the aggregate, and the like. Preferably, the coarse aggregate having a size of 20 mm to 5 mm or 13 mm to 2.5 mm is used as the natural aggregate, and the aggregate having the size of 10 mm to 0.08 mm is used as the fine aggregate.

Recycled aggregate

In the present invention, the recycled aggregate refers to an aggregate (13 mm or less) obtained by crushing the previously prepared ascon, and has asphalt (asphalt asphalt) used in the production of the old ascon.

Asphalt pavement filler material

In the present invention, in addition to the above aggregate, asphalt, and sulfur powder, asphalt filler materials known in the art may be used in the asphalt concrete. In the present invention, 2 to 10 parts by weight of packing filler is added. As such an asphalt pavement filler component, for example, powders of limestone, portland cement, slaked lime, fly ash, recovered dust, electric furnace slag, and other suitable mineral substances may be used singly or in combination. The characteristics such as the particle size of the filler are described, for example, in the KS F 3501 standard. On the other hand, if necessary, various additives known in the art such as anti-peeling agent, fiber reinforcing agent, freeze storage agent, regeneration additive and the like can be further used.

asphalt

Asphalt usually exists in a solid or semi-solid state at room temperature, but has a property of being melt-liquefied upon heating. In the case of petroleum-based asphalt, various types of straightrun asphalt of the refinery process are used intact or diluted asphalt obtained by diluting the above-mentioned direct asphalt with paraffin distillate, aromatic, naphthenic oil fraction or a mixture thereof is used . Asphalt is divided into several grades based on the degree of hardness, and there are penetration, viscosity and compatibility grades.

Especially, asphalt compatibility grade is the asphalt compatibility grade (PG) which is composed of binder test method of SuperPave (Superior Performance Asphalt Pavement) system developed through SHRP (Strategic Highway Research Program) in USA. Since the establishment of the public performance class (PG) in the US, the quality of the asphalt pavement applied in the field has been improved. The criteria for the compatibility of asphalt is to select suitable asphalt for local characteristics in consideration of on-site climate and traffic conditions so as to resist plastic deformation and cold cracking pavement damage. Recently, the Ministry of Land, Transport and Maritime Affairs According to the KS standard, the asphalt based on the degree of penetration is difficult to adequately reflect the high-temperature resistance characteristics. Therefore, the section where the risk of plastic deformation is high is classified according to the PG (Performance Grade) PG58-22 or PG64-22, quality of modified asphalt binder PG70-22 or PG76-22 or higher) asphalt.

New material asphalt

In the present invention, a new asphalt is called a new asphalt in contrast to the above-mentioned unsupported asphalt. New asphalt is a straight asphalt which is generally expressed in Korean industry standard. It classifies according to the degree of penetration and generally uses straight asphalt with penetration degree (60 ~ 80) or (80 ~ 100) range.

&Lt; Moderate tempering additive composition >

The asphalt modifier additive composition is added in an amount of 1.0 to 2.5 parts by weight to the asphalt composition. When the additive amount exceeds 2.5 parts by weight, the fluidity at high temperature is lowered when the asphalt concrete is produced, If the amount is less than 1.0 part by weight, the effect of reducing the viscosity of the asphalt (AP) and improving the fluidity of the asphalt (AP) in a high temperature environment can not be exhibited. It is difficult to obtain. Most of the reforming additives are modified sulfur, which can reduce the amount of conventional binder used and minimize the amount of energy used and the amount of carbon dioxide generated.

The asphalt asphalt modifying additive composition comprises 360 to 600 parts by weight of modified sulfur; 60 to 90 parts by weight of at least one polymer material selected from the group consisting of ethylene vinyl acetate (EVA), epoxy resin, polypropylene, and polyurethane; 4 to 5 parts by weight of carbon black, 2 to 4 parts by weight of a compatibilizing agent, and 0.5 to 1 part by weight of a dispersing agent. Preferably, the polymer material is ethylene vinyl acetate (EVA), and the asphalt additive composition may further comprise 60 to 90 parts by weight of waste tire fine powder.

Modified sulfur

The present invention replaces a portion of a conventional straight asphalt binder with modified sulfur to improve the production temperature reduction (20 ° C to 40 ° C) and the quality performance (stability, dynamic stability, etc.) of the asphalt mixture. It is possible to provide a mesophase type asphalt mixture prepared at a middle temperature of 120 to 140 ° C which is lower than the high temperature of 160 to 170 ° C which is higher than the high temperature of 160 to 170 ° C at which the heated asphalt mixture which is a general asphalt is produced .

In the present invention, the modifier used for sulfur reforming is a dicyclo pentene (DCPD) modifier.

The dicyclopentadiene-based modifier includes dicyclopentadiene (DCPD) as a modifying component, as disclosed in Korean Patent Publication No. 10-2006-101878. DCPD may be used alone or at least one of cyclopentadiene (CPD), DCPD derivative, CPD derivative (e.g., methylcyclopentadiene (MCP), methyldicyclopentadiene (MDCP) An added mixture may be used. Exemplary compositions of such dicyclopentadiene modifiers include about 65-75 wt.% DCPD, about 10-20 wt.% CPD, about 10-20 wt.% Of their derivatives (MCP, MDCP, etc.) 1.5% by weight. The dicyclopentadiene-based modifier may be used in a form mixed with an olefin compound such as dipentene, vinyl toluene, styrene monomer, or dicyclo pentene. The dicyclopentadiene-based modifier is preferably a dicyclopentadiene-based modifier having a DCPD content of about 70% by weight (referred to as "purity of 70%") or more as disclosed in JP-A-2002-60491 and Korean Patent Publication No. 10-2005-26021 . Modified sulfur added to 20 to 50% by weight of dicyclopentadiene (DCPD) modifier is used for sulfur.

Polymer material

60 to 90 parts by weight of a polymer (EVA, epoxy resin, polypropylene, and at least one member selected from the group consisting of polyurethane) based on 360 to 600 parts by weight of modified sulfur.

1. Ethylene Vinyl Acetate (EVA):

A polymer obtained by copolymerizing ethylene and a vinyl acetate monomer is referred to as EVA. As the content of vinyl acetate increases, the density increases, while the degree of crystallization decreases and the flexibility increases. Low-volume EVA is processed like ordinary low-density polyethylene and is excellent in impact resistance (especially at low temperature) and stress-cracking resistance, so it is used for heavy-wall materials and adhesives for laminate films. It has good compatibility with PE, PP, PVC, rubber etc. and is used to improve impact resistance and workability. In particular, since ethylene vinyl acetate (EVA) is easily melted at 100 ° C or lower (melting point 65-90 ° C), it is produced at 120-140 ° C, which is lower than 30 ° C higher than 160-170 ° C, It is more preferable to prepare an asphalt mixture.

2. Polypropylene

Polypropylene is very similar in properties to polyethylene but with a smaller specific gravity (0.9-0.92), it is among the lowest among all plastics. When ignited, it burns just like polyethylene, but because it gives off a peculiar smell, it can be easily distinguished from polyethylene. The overall physical properties are similar to those of polyethylene, but tensile strength and hardness tend to increase when the degree of crystallization is high, and the impact strength tends to fall inversely with respect to stress-breaking properties, transparency, and tensile strength. The basic color is translucent, and it is excellent in hinge hinge (hanging like a hinge), and it can not be cut even if folded repeatedly. In addition, it is excellent in electrical characteristics and is easy to stain and color.

3. Epoxy resin

Epoxy resin is a general term for thermosetting resins having an epoxy group in the molecule. Currently, the most popular type is a condensation product of bisphenol A and epichlorohydrin, accounting for about 90% of total demand. Epoxy resins have excellent properties such as heat resistance, adhesiveness, electrical insulation, chemical resistance and water resistance, but they are rarely used alone and are used together with a 'curing agent'. Depending on the blending conditions of the raw materials, the first resin may be obtained in an oil-like form to a solid form having a softening point near 160 ° C, so that the reaction conditions are selected according to the use of the latter. When an acid such as an amine or a phthalic anhydride such as m-phenylene diamine is added to the first resin (called a curing agent), the ring of the epoxy group is opened and the reaction with the hydroxy group occurs to form a bridge bond. Thus, resins with different properties are produced. The epoxy resin has a specific gravity of 1.230 to 1.189 and is excellent in mechanical properties such as bending strength and hardness. There is no generation of volatile substances and shrinkage of volume at the time of curing, and a large adhesive force is given to the material surface when curing. Flammability and chemical resistance are high, but are slightly eroded by strong acid and strong base. The pigment can be colored arbitrarily by adding the pigment (pigment), and the tomorrow's light is also great. The maximum operating temperature of the product is as low as 80 ℃. It shows excellent processability such as casting, embedding and sealing.

4. Polyurethane

As a general term for a polymer compound having a urethane bond -NHCOO- in the repeating unit of the main chain, a heavy addition reaction between a diisocyanate and a glycol is used industrially, and as the diisocyanate, only tolylene diisocyanate (2,4- 2, and 6), examples of the compound having a hydroxyl group include polyether type ones such as polyoxypropylene glycol and polyoxypropylene-polyoxyethylene glycol, and polyester type ones in which adipic acid and ethylene glycol are condensed There are two kinds. The former is called polyether polyurethane, and the latter is called polyester polyurethane. The properties of the polyamide and the polyester are intermediate. It dissolves in concentrated sulfuric acid, formic acid, phenol and cresol. Hygroscopicity is lower than that of polyamide and is 1 to 1.5% at 65% relative humidity. It is excellent in abrasion resistance, chemical resistance, solvent resistance, aging resistance and oxygen stability.

Waste tire fine powder

CRM, a rubber-based resin used in additives, is a raw gum powder recycled from waste tires for automobiles. In general, asphalt with added waste tires has high viscosity at high temperature and low stiffness at low temperature compared to general asphalt (AP-5). High viscosity maintenance at high temperature is resistant to high stress and deformation caused by traffic load So that the occurrence of plastic deformation is suppressed, and the low rigidity at low temperature increases the resistance to temperature cracking. The waste tire fine powder used in the present invention was a fine powder having an average particle size in the range of 80 mesh (180 m) to 300 meshes (85 m). If the average particle size is larger than a certain size range, it can not function as a rubber-based resin polymer due to swelling of the CRM particles filling the voids of the asphalt mixture. Of course, it is difficult to perform the test for the asphalt performance test. On the other hand, if the average particle size is smaller than a certain size, it is advantageous that the modifying effect of the modified asphalt mixture can be obtained early by increasing the miscibility with the asphalt. However, since the CRM fine powder is deteriorated due to the volume and scattering of the fine powder, There is a disadvantage that economical problems arise. The waste tire fine powder is added in an amount of 60 to 90 parts by weight based on 360 to 600 parts by weight of modified sulfur.

Carbon black

Carbon black is industrially manufactured by collecting soot generated by incomplete combustion of natural gas and tar, or by pyrolyzing them. 85% of the current consumption is used for rubber, and it is suitable that there is no fine chain-like bond of particles, and it is used to give properties such as reinforcing agent, oil resistance and heat resistance. In the present invention, the carbon black serves to stabilize the aged physical properties of waste tire fine powder and to maintain the black color of the asphalt mixture at the same time, and the carbon black powder having an average particle size of 100mesh (152 탆) to 200mesh (75 탆) Is preferably used.

In the present invention, 2 to 4 parts by weight, preferably 3 parts by weight, of a compatibilizing agent and 0.5 to 1 part by weight, preferably 0.5 part by weight, of a dispersant (PE wax) for improving dispersion are used. PE (Polyethylene) Wax is a material made by polymerization of ethylene and has an intermediate polymerization stage. PE Wax is divided into 2 types of LD (Homopolymer, Oxidized Homopolymer) and 2 kinds of HD (High Density Oxidized Homopolymer, Copolymer). As the molecular weights per unit volume are large and small, HD (High Density) and LD Density). In the present invention, the dispersion effect is maximized by using PE wax 3%.

Hereinafter, the present invention will be described in detail by way of examples. The following examples and comparative examples illustrate the invention in more detail, but do not limit the scope of the invention.

&Lt; Preparation of regenerated mesophase-type modified asphalt mixture and comparative asphalt according to the present invention >

Example 1

The reforming additive was prepared by adding 70 Kg of EVA, 4.5 Kg of carbon black powder, 3 Kg of a compatibilizing agent (modified olefin resin: NB 1600PE) and 40 kg of a dispersing agent PE (modified polyolefin resin) to 400 Kg of modified sulfur added with 30% by weight of dicyclopentadiene (DCPD) And 0.5 kg of WAX.

The asphalt of Example 1 was prepared to include 30 kg of recycled aggregate, 45 kg of crumbly aggregate, 22 kg of crushed fine aggregate, 3 kg of asphalt pavement filler, 1.2 kg of asphalt pavement, 3.5 Kg of fresh asphalt, and 2.9 Kg of moderate temperature reforming additive.

Comparative Example 1

The asphalt of Comparative Example 1 was prepared to include 30 kg of recycled aggregate, 46 kg of crushed coarse aggregate, 20 kg of crushed fine aggregate, 4 kg of asphalt pavement filler, 1.2 kg of asphalt asphalt, and 4.6 kg of new asphalt. That is, unlike Example 1, a conventional recycled heated asphalt mixture was prepared, which lacked the moderate temperature modifying additive.

Comparative Example 2

The asphalt of Comparative Example 2 was prepared to include 42 kg of crumbly aggregate, 54 kg of crushed fine aggregate, 4.0 kg of asphalt pavement filler, and 5.4 kg of new asphalt. That is, unlike Examples 1 and 2, a conventional warmed asphalt mixture was prepared in which a moderate temperature modifying additive was absent.

&Lt; Quality test results of Examples and Comparative Examples 1 and 2 >

The quality of asphalt mixture has a lot of quality characteristics from the functional point of view. However, the quality of asphalt mixture is affected by Marshall stability (MS), flow value (KS F 2349: 2010) specified in KS F 2349: 2010 or Ministry of Land, Transport and Maritime Affairs Asphalt Mixture Production and Construction Guidelines (DS) and indirect tensile strength (DS) to investigate the resistance to moisture damage (Flow), porosity (VTM), saturation degree (VFA), aggregate porosity (VMA) ITS) and tensile strength index (TSR). The above test items were measured for Example 1 which is an asphalt mixture of the present invention, Comparative Example 1 which is a mixture of a conventional recycled heated asphalt and Comparative Example 2 which is a conventional common heated asphalt mixture, and the results are shown in Example 1 and Comparative Examples 1 and 2 The results are shown in Table 1 and Table 3, respectively.

Test Items unit Test result Stability (MS) N 15,210 Flow value (Flow) 1 / 100cm 24 Porosity (VTM) % 4 Saturation (VFA) % 76 The porosity (VMA) % 17.0 Dynamic Stability (DS) Times / mm 3,390 Indirect Tensile Strength (ITS) (25 ℃) N / mm ² 1.6 Toughness (25 ° C) N · mm 22,450 Soil stability (MSR, 48hr) % 92 Tensile hardness ratio (TSR) 0.89 PG rating PG76-22

Test Items unit Test result Stability (MS) N 11,520 Flow value (Flow) 1 / 100cm 26 Porosity (VTM) % 4 Saturation (VFA) % 76 The porosity (VMA) % 17.0 Dynamic Stability (DS) Times / mm 1,252 Indirect Tensile Strength (ITS) (25 ℃) N / mm ² 1.2 Toughness (25 ° C) N · mm 14,250 Soil stability (MSR, 48hr) % 79 Tensile hardness ratio (TSR) 0.82 PG rating PG64-22

Test Items unit Test result Stability (MS) N 10,214 Flow value (Flow) 1 / 100cm 26 Porosity (VTM) % 4 Saturation (VFA) % 74 The porosity (VMA) % 16.3 Dynamic Stability (DS) Times / mm 1,340 Indirect Tensile Strength (ITS) (25 ℃) N / mm ² 1.0 Toughness (25 ° C) N · mm 12,458 Soil stability (MSR, 48hr) % 78 Tensile hardness ratio (TSR) 0.76 PG rating PG64-22

It was confirmed that Example 1 showed much higher stability than Comparative Examples 1 and 2. That is, the present invention can confirm that the strength to withstand the load of the vehicle is much stronger than the conventional asphalt mixture.

As a reliable test item for evaluating the plastic deformation resistance of asphalt mixtures, there is dynamic stability (DS), and the greater the dynamic stability, the greater the resistance to plastic deformation. The reference value for the dynamic stability specified for the surface layer of the asphalt mixture in the Korean Industrial Standard (KS F 2349) is 750 times / mm, and not only the embodiment 1 of the present invention is much higher than the reference value, Mm / mm, and 1,340 times / mm in Comparative Example 2, respectively. Therefore, it can be confirmed that the asphalt mixture according to the present invention is superior in plastic deformation resistance to the conventional asphalt compositions of Comparative Examples 1 and 2.

According to the present invention, it is possible to provide an additive which is based on modified sulfur and a moderate temperature modifying additive using a low melting point polymer material, Type recycled asphalt mixture can be produced, and furthermore, the quality performance (stability, dynamic stability, etc.) of the asphalt mixture is improved as confirmed above.

Claims (5)

360 to 600 parts by weight of modified sulfur;
60 to 90 parts by weight of at least one polymer material selected from the group consisting of ethylene vinyl acetate (EVA), epoxy resin, polypropylene, and polyurethane;
4 to 5 parts by weight of carbon black,
2 to 4 parts by weight of a compatibilizing agent, and
0.5 to 1 part by weight of a dispersing agent,
Wherein the asphalt is added to the recycled modified asphalt mixture so that the asphalt is produced at an intermediate temperature of 120-140 &lt; 0 &gt; C. The method according to claim 1,
Wherein the polymeric material is ethylene vinyl acetate (EVA). &Lt; RTI ID = 0.0 &gt; 20. &lt; / RTI &gt; The method according to claim 1,
Wherein the asphalt additive composition further comprises 60 to 90 parts by weight of waste tire fine powder. 30 to 50 parts by weight of recycled aggregate for ascon,
30 to 50 parts by weight of crumbly aggregate as natural aggregate,
20 to 40 parts by weight of crushed fine aggregate as natural aggregate,
2 to 10 parts by weight of filler,
1.0 to 1.5 parts by weight of asphalt of recycled aggregate for ascon,
To a regenerated asphalt composition comprising 2.3 to 4.0 parts by weight of virgin asphalt,
Further comprising 1.0 to 2.5 parts by weight of the asphalt modifying additive composition of any one of claims 1 to 3,
A mesophilic recycled modified asphalt mixture using an asphalt recycled aggregate characterized in that the asphalt is produced at a middle temperature of 120 to 140 ° C. 5. The method of claim 4,
Characterized in that the admixture has an admixture having an admixture having a degree of compatibility PG 76-22.