KR20170011981A - Low cost and Hi-performance Asphalt Binder Composition for Asphalt Pavement Using Residue produced during Solvent De-Asphalting Process, And Manufacturing Method thereof - Google Patents
Low cost and Hi-performance Asphalt Binder Composition for Asphalt Pavement Using Residue produced during Solvent De-Asphalting Process, And Manufacturing Method thereof Download PDFInfo
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- KR20170011981A KR20170011981A KR1020160024962A KR20160024962A KR20170011981A KR 20170011981 A KR20170011981 A KR 20170011981A KR 1020160024962 A KR1020160024962 A KR 1020160024962A KR 20160024962 A KR20160024962 A KR 20160024962A KR 20170011981 A KR20170011981 A KR 20170011981A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
- C08L2207/22—Recycled asphalt
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Abstract
Description
The present invention relates to an asphalt mixture composition used for road asphalt pavement and a method for producing the same. More particularly, the present invention relates to an asphalt mixture composition for use in asphalt pavement made by using residues generated in a SDA process (Solvent De-Asphalting Process / solvent deasphalting process or solvent extraction process) The present invention relates to a "asphalt mixture composition" and a "production method of an asphalt mixture composition" which can be produced at low cost while exhibiting high performance by having a composition in which a binder composition is mixed with an aggregate.
The price of asphalt, which is the main material of asphalt pavement, is also rising rapidly due to the rapid increase of crude oil prices. Therefore, it is necessary to develop alternative materials for construction and maintenance of asphalt pavement and to develop new repair method. Recently, it has been actively engaged in securing and developing a low-cost heavy oil exploration well represented by Venezuelan ultra-heavy oil and Canadian oil sands bitumen. In addition, a review of measures to apply low-cost heavy oil to the refinery process operating in Korea Some are known to be in progress. As crude oil becomes heavier in order to secure energy resources in preparation for the era of high oil prices, conventional technologies can not meet the demand for petroleum and chemical raw materials, and accordingly, there is a need to develop new technologies corresponding thereto.
In developed countries such as the United States and Canada, to secure clean oil resources production technology for continuous high oil prices and heavy oil resources, and to overcome and overcome the shortcomings of conventional technologies, new hardening technologies for low- It is actively under development. However, as the hardening process for new heavy oil becomes more sophisticated, the pitch, which is the hardening by-product in the refining process, is mass-produced. Such residues are different from the general bituminous products used as construction materials in physical / And it is difficult to utilize it as a construction material. Asphalt as a bituminous material used as a construction material is generally used as a binder for an asphalt mixture to be an asphalt pavement material or as a waterproofing agent for reinforcing the waterproofing function of a structure. Therefore, durability performance including workability in the field is secured It is essential. However, since the pitch corresponding to the hardened by-product (residue) discharged at the final stage of the refining process of the heavy oil component is the state in which oil, which is a main component for providing the functionality of the asphalt, is removed, Otherwise, there is a limit to being used as a binder for an asphalt mixture alone.
In addition, domestic refiners have been focusing on the development of technologies to extract oil from crude oil using the production of DAO (De-Asphaltene Oil) by using SDA process and catalytic hydrogenation in connection with the upgrading of low-cost heavy oil. , The quality of the asphalt binder currently used in the domestic market is also decreasing. Asphalt for road pavement is required to ensure workability and workability by the oil present in the asphalt because it is not suitable for processing as well as processing in the state where oil is removed.
Korean Patent No. 10-1120509 proposes a method for improving the quality of asphalt produced through the SDA process, but there is a limitation that the object to be achieved is limited to the lowering of the penetration of asphalt.
The present invention has been developed in view of the above situation, and as the oil refining process is advanced and improved in quality, the performance of low quality asphalt, asphaltene and pitch generated in road pavement is improved to replace existing asphalt pavement material "Mixed asphalt composition and method for producing it" by mixing the asphalt binder composition made using the residues produced through the SDA process corresponding to the hardened dispersion of low-cost heavy oil and the aggregate, and exhibiting high performance and low manufacturing cost The purpose is to provide.
Specifically, the present invention utilizes asphalt, asphaltene, and pitch having a lower quality (less oil content) than that of a conventional asphalt paving material as a road paving material. It is a technique of improving resistance to plastic deformation and fatigue cracking, It is an object of the present invention to provide an asphalt mixture composition capable of prolonging a common life and improving resistance to moisture to prevent damage to a road pavement such as a porthole, and a method of manufacturing the same.
Particularly, the present invention relates to a method for producing an asphalt mixture composition at a low cost by using asphalt, asphaltene and pitch, which are inexpensive materials corresponding to residual residues, by extracting oil (oil) which can be extracted from crude oil to a maximum extent, It is an object of the present invention to provide a mixed composition.
In order to achieve the above object, the present invention provides an asphalt mixed composition comprising 2 to 8 wt% of an asphalt binder composition and 92 to 98 wt% of an aggregate, wherein the asphalt binder composition contained in the asphalt mixture composition of the present invention comprises , 90 to 95% by weight of the residue of the SDA process, 1 to 7% by weight of a modifying additive, 0.1 to 1.0% by weight of a binding reinforcing agent, SBR (Styrene-Butadiene Rubber) 1.0 to 3.0% by weight of SBS (Styrene-Butadiene-Styrene), 0.1 to 1.0% by weight of sulfur and 0.1 to 0.5% by weight of a vulcanization accelerator.
Also, in order to achieve the above object, the present invention provides a method for producing an asphalt mixture composition comprising 2 to 8 wt% of an asphalt binder composition and 92 to 98 wt% of an aggregate, The asphalt binder composition comprises a melt mixing step of melt-mixing 90 to 95% by weight of the residue of the SDA process, 1 to 7% by weight of a modifying additive and 0.1 to 1.0% by weight of a bonding reinforcing agent, when the entire asphalt binder composition is 100% Mixing the molten mixture produced by the melt mixing step with 1.0 to 3.0% by weight of SBR or SBS and further stirring; And a vulcanization step in which 0.1 to 1.0 wt% of sulfur and 0.1 to 0.5 wt% of a vulcanization accelerator are added to the mixture by the stirring and mixing step.
Particularly, in the production method of the present invention, the asphalt binder composition is immersed in an oven heated to about 150 to 160 degrees Celsius for about 60 to 90 minutes to secure fluidity of the asphalt binder composition, After heating for about 4 hours or more in an oven heated to 180 degrees, the asphalt binder composition and the aggregate are mixed.
In addition, in the manufacturing method of the present invention, the aggregate includes coarse aggregate having a size of 4.75 mm or more, and 95% or more of the coarse aggregate is mixed with the asphalt binder composition. After mixing, The mixture of the aggregate and the asphalt binder composition is placed in an oven heated to 145 DEG C, and the compaction is carried out after mounting for about 60 minutes. As the compaction equipment, a Marshall compaction unit or a swing compaction unit can be used.
In the composition of the present invention and the preparation method thereof, the modified additive is a modifying additive for softening comprising at least one oil selected from the group consisting of aromatic oil, naphthenic oil, paraffin oil and white oil It may be
Further, in the asphalt mixture composition of the present invention and the method for producing the same, the modifying additive may be a natural oil rather than an oil produced from petroleum. The vulcanization accelerator may be a thiazole vulcanization accelerator, a guanidine- A vulcanization accelerator, a sulfenamide vulcanization accelerator, and a thiuram vulcanization accelerator.
In the asphalt mixture composition and the method for producing the same according to the present invention, the content of residues in the SDA process is 92% by weight, the content of the modifying additive is 4.85% by weight based on 100% by weight of the entire asphalt binder composition, The content is 0.15% by weight. The SBR is in powder form, the content thereof is 2.6% by weight, the content of sulfur is 0.3% by weight, and the content of the vulcanization accelerator is 0.1% by weight.
According to the present invention, there is provided a low-cost high-performance asphalt mixture composition capable of improving the plastic deformation resistance and the fatigue crack resistance by exhibiting the flexibility and elastic effect required in a general heated asphalt using the remnants generated through the SDA process.
Further, according to the present invention, in addition to the most basic function of the heated asphalt pavement, the adhesion performance between the aggregate used in the asphalt mixture and the residues of the SDA process is increased, and thus the pavement damage Lt; RTI ID = 0.0 > moisture. ≪ / RTI >
Also, according to the present invention, it is possible to improve plastic deformation and fatigue crack resistance by using high performance and high function packaging technology over existing heated asphalt mixture, thereby increasing the service life of the package, thereby preventing premature package breakage, It has an advantage that the maintenance cost can be reduced.
Further, according to the present invention, as the continuous crude oil refining process is advanced, low quality pitch or asphaltene or asphalt can be improved to exhibit improved performance over conventional asphalt, and in a low-cost heavy oil refining process in Venezuela or Canada Black Gold mines The remnants of the SDA process can be improved to exhibit the same or higher common performance as the existing heated asphalt, thereby having an economical effect of remarkably reducing the construction cost and extending the service life of the package.
In addition, according to the present invention, the viscosity of the residue of the SDA process is remarkably reduced through the modifying additive, so that the production and the application temperature can be remarkably reduced, and the workability can be increased to exhibit a more uniform packaging performance at the time of production.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, numerous specific details are set forth, such as specific elements, which are provided to aid in an overall understanding of the present invention, and it is to be understood that the present invention may be practiced without these specific details, It will be obvious to those who have it. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
The asphalt mixed composition according to the present invention comprises 2 to 8 wt% of the asphalt binder composition and 92 to 98 wt% of the aggregate.
The asphalt binder composition contained in the asphalt mixture composition of the present invention is characterized in that the residue produced by the SDA process on the heavy oil fraction corresponding to the hardening by-product discharged in the final stage of the purification process of the low-cost heavy oil fraction quot; residue "). The asphalt binder composition according to the present invention specifically includes the residues of the SDA process, a modifying additive (specifically, a softening additive), and a bonding reinforcement agent. Specifically, the asphalt binder composition according to one embodiment of the present invention comprises 90 to 95% by weight of residues generated through the SDA process, 1 to 7% by weight of a modifying additive, 0.1 to 1.0% by weight of a binding additive 1.0 to 3.0% by weight of one or more materials selected from the group consisting of styrene-butadiene rubber (SBR) .
In the present invention, the residue of the SDA process is 90 to 95% by weight, preferably 92 to 95% by weight, more preferably 94 to 95% by weight, based on the weight of the entire asphalt binder composition. 95% by weight. If the residue content of the SDA process is less than 90% by weight, the softening point of the asphalt binder composition becomes too low, the penetration value increases, or the high temperature grade of the co-operative grade decreases, thereby failing to secure resistance to plastic deformation. On the other hand, when the residue content of the SDA process exceeds 95% by weight, the viscosity of the asphalt binder composition increases and the asphalt paving operation becomes impossible, and cracks may be caused in the asphalt pavement due to the high hardness.
Among the residues of the SDA process used in the present invention, the pitch should have an invasion degree of 30 or lower, a softening point of 50 or higher, a high-temperature grade of 64-94 degrees Celsius and a low-temperature grade of 0 degrees Celsius. The heated asphalt commonly used in the prior art has a penetration of 60 to 80, a softening point of less than 50, a high temperature grade of 58 to 64 degrees Celsius in the commonality grade, and a low temperature grade of -16 to -22 degrees Celsius in the commonality grade, The pitch used in the present invention is a completely different material from such conventional heated asphalt.
Conventional asphalt binder compositions for use in asphalt road pavement comprise about 4-6 wt.% Of saturates, about 50-60 wt.% Aromatics, about 20-21 wt.% Of resins, asphaltene) of about 19 to 25% by weight. However, the residues produced through the SDA process contain about 1 to 3.5% by weight of a seturate, about 50 to 60% by weight of aromatics, about 19 to 22% by weight of resins, about 22 to 23% by weight of asphaltene, , And thus shows a large difference in the content of the settler. Due to the difference in the content of such a detergent, the residues of the SDA process have a very hard characteristic and are therefore excellent in resistance against deformation which can be generated at a high temperature. However, such rigid properties of the residues of the SDA process ultimately lead to very brittle characteristics, which are disadvantageous in that crack resistance caused by winter or vehicle load is remarkably low.
As described above, the residues of the SDA process have a lower brittle characteristic because the content of the surfactant is lower than that of conventional asphalt binders. Therefore, in the present invention, flexibility is secured by softening the properties of brittleness by adding a modifying additive. Specifically, in the present invention, a modifying additive is used to improve the remnants of the SDA process to soft asphalt. Among the chemical components constituting the remnants of the SDA process, the settler, which is relatively insufficient as compared with the conventional asphalt binder composition, is chemically reinforced Or the residual components of the SDA process can not be filled with relatively less chemical components as compared with the conventional asphalt binder composition, but the physical properties of the residues of the SDA process can be compared with conventional asphalt binder compositions And a modifying additive to be the same as the composition was selected and used.
Specifically, as the modifying additive contained in the asphalt binder composition according to the present invention, the "modifying additive for softening ", which can chemically reinforce the settler, comprises an aromatic oil, naphthenic oil, paraffin oil and white oil ≪ / RTI > The components constituting the oil are generally composed of three components: an aromatic component having a benzene ring in a molecular structure, a naphthenic component having a cyclic structure, and a paraffinic component having a linear structure do. Among the above three components, "aromatic oil" is referred to as having a large amount of aromatic components, "naphthenic oil" as having a large amount of naphthenic components, and "paraffin oil" as having many paraffin components. On the other hand, a transparent oil that does not contain an aromatic component and has no color is called "white oil ".
As described above, in the present invention, the residual components of the SDA process can not be filled with relatively less chemical components than the conventional asphalt binder composition, but the physical properties of the residues of the SDA process are the same as those of the conventional asphalt binder composition In this case, "natural oil" rather than oil produced from petroleum is used as a modifying additive. Natural oils can be classified into vegetable oils and animal oils. The vegetable oils include soybean oil, castor oil, palm oil, rapeseed oil, sunflower oil, oil, and corn oil. Examples of animal oils include fish oil and pig oil. In general, vegetable oil has a structure in which three fatty acids are bound to a glycerol junction at a triglyceride molecule, and free fatty acids, stearin, pigment components and fat soluble vitamins .
In the present invention, one of the above-mentioned vegetable oil and animal oil can be used as a modifying additive. In order to improve the adhesion between asphalt and asphalt and the adhesion between aggregate and asphalt, a natural oil having a polar group is selected, Is preferably used.
The asphalt binder composition according to the present invention may contain 1 to 7% by weight of a modifying additive consisting of a modifying additive for softening or a natural or modified vegetable oil made from petroleum. In the present invention, the preferred content of the modifying additive is 3 To 6% by weight, and the content of the modifying additive is more preferably 3 to 5% by weight. If the content of the modifying additive is less than 1% by weight, the brittle characteristics of the asphalt mixture containing the asphalt binder composition become strong, and when the asphalt mixture is produced, the asphalt mixture can not be produced due to viscosity increase, The production of the asphalt mixture must be induced. In addition, since the brittle characteristics of the asphalt mixture are strong, resistance to temperature cracks such as occurrence of shrinkage cracks as the temperature is lowered is reduced, and second infiltration damage is caused by moisture penetration, Thereby causing fatigue crack failure. Therefore, the content of the modifying additive should be 1% by weight or more. On the other hand, if the content of the modifying additive exceeds 7% by weight, the rigidity of the residue of the SDA process is reduced, and the deformation due to the traffic load at the high temperature in the summer is greatly generated, . Therefore, the content of the modifying additive should be 7 wt% or less.
The asphalt binder composition according to the present invention contains 0.1 to 1.0% by weight, preferably 0.1 to 0.5% by weight, more preferably 0.1 to 0.3% by weight, based on the total weight of the asphalt binder composition. If the content of the bonding reinforcing agent is less than 0.1% by weight, the aggregating material and the asphalt or the asphalt and the asphalt can not exhibit the effect of increasing the bonding force and the adhesion force, and they can not serve as surfactants, . When the content of the bonding reinforcing agent exceeds 1.0% by weight, the bonding property with the natural oil contained as the modifying additive may be reduced, phase separation may occur, and the economical efficiency may be reduced.
As the bonding reinforcing agent, an amine-based or silane-based material can be used, and the bonding reinforcing agent improves the moisture sensitivity of the asphalt binder composition and enhances the peeling prevention function. The amine-based or silane-based materials have a moiety capable of strongly bonding to the aggregate in the molecular structure, and also have a portion that exhibits strong affinity with the residues of the SDA process. Therefore, when an amine-based or silane-based material is contained as a bonding reinforcing agent, it exhibits a strong affinity with each material constituting the asphalt mixture, and consequently exhibits an effect of strengthening the adhesive strength. Also, the amine-based or silane-based material as the bonding reinforcing agent is mixed with the asphalt to serve as a surfactant, thereby reducing the contact angle when the asphalt is in contact with the aggregate. This is because when the asphalt is wetted The effect of improving the properties is exhibited. Considering economical efficiency, it is more preferable to use an amine-based material as a bonding additive rather than a silane-based material. The amine-based bonding agent used in one embodiment of the present invention has a total amine number of 461.17 to 462.45 mg HClO 4 / g, and has a specific gravity of 0.90 to 0.95 and a viscosity Is preferably 400 to 2,000 cPs. If the viscosity of the amine-based bonding reinforcing agent is less than 400 cPs, the material separation may occur during mixing. Conversely, if the viscosity exceeds 2,000 cPs, the mixing and workability may be reduced.
The asphalt binder composition according to the present invention contains SBR (Styrene-Butadiene Rubber) and SBS (Styrene-Butadiene-Styrene) alone or as a mixture thereof in an amount of 1.0 to 3.0% by weight. SBR and SBS can be used in powder form. If the content of SBR and SBS is less than 1 wt%, the asphalt modifying effect and sufficient adhesion with asphalt pavement material can not be expected. On the other hand, when the content selected from SBR and SBS exceeds 3% by weight, mixing with asphalt may be impossible due to excessive viscosity increase. In dividing the asphalt grade (PG) One level rise. Therefore, in the present invention, the content selected from SBR and SBS is 3% by weight or less.
In one embodiment of the present invention, the powdered SBR may have a molecular weight ranging from 300,000 to 1,000,000. When the molecular weight of the powdery SBR is less than 300,000, it may be difficult for the powders to be homogeneously dispersed when put into the asphalt. If the molecular weight of the powdery SBR exceeds 1,000,000, the powder is not dispersed in the asphalt under the condition, It may not be usable. In particular, in one embodiment of the present invention, the powdered SBR may have a particle size of greater than 0 mm and less than 1 mm. When the particle size of the powdery SBR is more than 1 mm, the time to disperse into the asphalt is delayed, and gel phenomenon due to chemical bonding between the molecules may occur before dispersing, so that dispersion into the asphalt may become impossible.
In another embodiment of the asphalt binder composition according to the present invention, CRM (Crumb Rubber Modifier / Waste Tire Powder Asphalt Modifier), SBS (Styrene-Butadiene-Styrene) block copolymer, LDPE at least one auxiliary additive selected from the group consisting of high density polyethylene (HDPE), polypropylene, ethyl vinyl acetate (EVA), ethylene acralate copolymer and antioxidant Can be used.
The above-mentioned auxiliary additives are added to improve watertightness, adhesion, tensile strength and elongation of the asphalt mixture. CRM, which can be used as an auxiliary additive, is obtained by crushing waste tire, and preferably has a particle diameter of 0.08 to 2.00 mm. If the particle size of the CRM is less than 0.08 mm, it is difficult to grind and the inefficiency such as cost increase occurs. If the particle size is more than 2.0 mm, it is difficult to achieve sufficient mixing as the reforming agent. Therefore, the particle diameter of the CRM is preferably 0.08 to 2.0 mm, but is not limited thereto.
Meanwhile, low density polyethylene (HDPE), high density polyethylene (HDPE), polypropylene, and ethylene acralate copolymer may be used as an auxiliary additive to replace SBR or SBS. These become auxiliary additives for increasing the stiffness of the asphalt mixture, i.e., resistance to deformation. In the present invention, the auxiliary additive may be contained in an amount of 0.5 to 1.5% by weight based on 100% by weight of the total binder composition.
The above-mentioned auxiliary additives are added to improve watertightness, adhesion, tensile strength and elongation of the asphalt mixture. CRM, which can be used as an auxiliary additive, is obtained by crushing waste tire, and preferably has a particle diameter of 0.08 to 2.00 mm. If the particle size of the CRM is less than 0.08 mm, it is difficult to grind and the inefficiency such as cost increase occurs. If the particle size is more than 2.0 mm, it is difficult to achieve sufficient mixing as the reforming agent. Therefore, the particle diameter of the CRM is preferably 0.08 to 2.0 mm, but is not limited thereto.
Meanwhile, low density polyethylene (HDPE), high density polyethylene (HDPE), polypropylene, and ethylene acralate copolymer may be used as an auxiliary additive to replace SBR or SBS. These become auxiliary additives for increasing the stiffness of the asphalt mixture, i.e., resistance to deformation. A material with a melting point of 150 ° C or less is used, which is very commonly used in the field of ethylene resins.
The sulfur used in the present invention can serve to enhance the high temperature plastic deformation of the asphalt, such as the increase of the softening point, and it is possible to use a general sulfur having a melting point of 110 to 120 degrees and a solid powder state at room temperature. In one embodiment of the asphalt binder composition according to the present invention, the sulfur may be contained in an amount of 0.1 to 1.0 wt%, preferably 0.1 to 0.5 wt%, more preferably 0.1 to 0.3 wt%, based on the total weight of the asphalt binder composition. If the content of sulfur is less than 0.1 wt%, the vulcanization effect of SBR or the like is insufficient, so there is no effect of improving the high temperature performance of the asphalt such as softening point. If it exceeds 1.0 wt%, the asphalt becomes gelled due to excessive vulcanization, have.
In one embodiment of the present invention, the sulfur may be in a powder state having a particle diameter of more than 0 mm but not more than 0.3 mm. When the diameter of the sulfur powder is more than 0.3 mm, the SBR dispersed in the asphalt is not uniformly vulcanized and phase separation phenomenon may occur and it may be difficult to obtain a uniform quality of the binder.
In one embodiment of the asphalt binder composition according to the present invention, the vulcanization accelerator is selected from the group consisting of a thiazole vulcanization accelerator, a guanidine vulcanization accelerator, a sulfenamide vulcanization accelerator, and a thiuram vulcanization accelerator And the like. In one embodiment of the present invention, the vulcanization accelerator may be included in an amount of 0.1 to 0.5% by weight, preferably 0.1 to 0.4% by weight, more preferably 0.1 to 0.3% by weight, based on the total weight of the asphalt binder composition. If the content of the vulcanization accelerator is less than 0.1% by weight, the effect of promoting vulcanization may not be exhibited. If the content of the vulcanization accelerator is more than 0.5% by weight, further improvement of the vulcanization accelerating effect may not be achieved.
In the method of the present invention for producing the asphalt binder composition of the present invention described above, a step of melt mixing (mixing) 90 to 95% by weight of the residue of the SDA process with 1 to 7% by weight of the modifying additive and 0.1 to 1.0% (Mixing and mixing step), and further adding 1.0 to 3.0% by weight of SBR or SBS to the mixture by stirring (stirring mixing step), and vulcanizing by adding 0.1 to 1.0% by weight of sulfur and 0.1 to 0.5% by weight of a vulcanization accelerator Step).
In the melt mixing step of melt-mixing the modifying additive and the bonding reinforcing agent in the residue of the SDA process, the modifying additive and the bonding reinforcing agent may be premixed in advance, and then the mixture may be melt-mixed into the residue of the SDA process. In particular, in the melt mixing step of melt-mixing the modifying additive and the bonding reinforcing agent into the residues of the SDA process, it is preferable to heat the residues of the SDA process to secure sufficient fluidity of the asphalt binder composition. Specifically, Deg.] C, preferably about 180 [deg.] C. When the temperature at the time of melt mixing is less than 160 ° C, sufficient fluidity can not be secured with respect to the residues of the SDA process. Therefore, when the asphalt binder composition is mixed with the aggregate, smooth mixing can not be expected and the aggregate covering by the asphalt binder composition There is a problem that is not completely accomplished. On the other hand, if the temperature during the melt mixing exceeds 200 degrees Celsius, rapid oxidation and curing of the residues of the SDA process may occur and the resistance to cracks may be reduced, leading to early breakage of road pavement such as cracks.
In the melt mixing step, the molten mixture of the modifying additive and the bonding additive and the residue of the SDA process may be formed by adding the modifying additive and the bonding reinforcing agent to the remnants of the molten SDA process, as described above, but the modifying additive and the bonding adjuvant Is preliminarily mixed at a temperature of 20 to 60 ° C., and a mixture of the modifying additive and the bonding reinforcing agent is added to the residue of the molten SDA process and stirred to obtain a molten mixture of the modifying additive and the bonding additive and the residue of the SDA process . And further stirring for 10 to 30 minutes in the melt mixing step. In this case, it is preferable that the additional stirring process is performed at a temperature of 160 to 180 degrees Celsius for easy control of the temperature.
In the stirring and mixing step subsequent to the melt mixing step, the powdery SBR or the powdery SBS can be uniformly dispersed in the molten mixture composed of the modifying additive and the bonding reinforcing agent and the residue of the SDA process. Of course, SBR and SBS may be added together and mixed by stirring. Such a stirring mixing step may be performed at a temperature of 160 to 200 degrees Celsius, preferably 170 to 180 degrees Celsius. The performance of the residue of the SDA process in which the temperature of the stirring and mixing step exceeds 200 degrees Celsius and the performance of SBR or SBS.
The stirring mixing step may also be carried out for 30 to 60 minutes. If the mixing time is less than 30 minutes, SBR or SBS may not be sufficiently mixed and it may be difficult to obtain a uniform dispersed phase. If the mixing time exceeds 60 minutes, the SDA process residue and degradation due to aging of SBR or SBS may result .
In the vulcanization step, the vulcanization step is carried out by adding sulfur and a vulcanization accelerator to the mixture obtained through the previous step and stirring the mixture. This vulcanization step can be carried out at a temperature of 150 to 200 degrees Celsius. When the temperature in the vulcanization step is less than 150 ° C., the flowability of the molten mixture is not ensured and it is difficult for the SBR or SBS to be uniformly dispersed in the mixture. On the other hand, if the temperature of the vulcanizing step exceeds 200 ° C, the performance degradation may occur due to aging of SBR or SBS. The vulcanization step can be carried out for 30 to 60 minutes. When the vulcanization time is less than 30 minutes, the vulcanization of SBR or SBS does not sufficiently proceed and sufficient reforming effect can not be obtained. If the vulcanization time exceeds 60 minutes, the degradation of the SDA process residue and the degradation of SBR or SBS .
As described above, the asphalt mixture composition of the present invention comprises 2 to 8 wt% of the asphalt binder composition and 92 to 98 wt% of the aggregate. In order to ensure the fluidity of the prepared asphalt binder composition, the asphalt binder composition is heated in an oven heated to about 150 to 160 ° C for about 60 to 90 minutes For a while. The aggregate is heated in an oven heated to about 160 to 180 degrees Celsius for about 4 hours or more. Thus, the asphalt binder composition and the aggregate are mixed in the oven and heated.
In the present invention, coarse aggregate having a size of 4.75 mm or more is contained in the aggregate. When the asphalt binder composition and the aggregate are mixed, it is sufficient that 95% or more of the coarse aggregate is coated by the asphalt binder composition, A mixture of the aggregate and the asphalt binder composition is placed in an oven heated to about 135 to 145 DEG C for about 60 minutes, and compaction is performed.
Hereinafter, the present invention will be described in more detail by way of examples. However, the following examples are illustrative of the present invention, and the scope of the present invention is not limited to the following examples.
(1) Preparation of Examples and Comparative Examples According to the Present Invention
The asphalt mixed composition according to the present invention comprises 2 to 8% by weight of the asphalt binder composition and 92 to 98% by weight of the aggregate. To prepare the asphalt binder composition of the present invention, the asphalt binder composition is heated in an oven heated to about 150 to 160 ° C for about 60 to 90 minutes to secure the fluidity of the prepared asphalt binder composition And the aggregate is heated in an oven heated to about 160 to 180 degrees centigrade for about 4 hours or more, and then the asphalt binder composition and the aggregate are mixed.
In the present invention, coarse aggregate having a size of 4.75 mm or more is contained in the aggregate. When the asphalt binder composition and the aggregate are mixed, it is sufficient that 95% or more of the coarse aggregate is coated by the asphalt binder composition, The mixture is then placed in an oven heated to about 135-145 degrees Celsius for about 60 minutes before compaction.
To prepare the asphalt mixture composition of the present invention, the asphalt binder composition was first melted by heating the residue of the SDA process at about 180 degrees Celsius and stirred with a stirrer. The modifying additive and the bonding reinforcing agent were gradually added to the residue of the SDA process being stirred, and stirring was continued. The modifying additive and the bonding reinforcing agent were added, and the modifying additive and the bonding reinforcing agent were completely melted and mixed with the residue while stirring for about 10 to 20 minutes. The temperature of the mixture is inevitably raised at the time of stirring, and therefore, the additional heating is preferably performed at 200 DEG C or less for easy control of the temperature.
Powdered SBR or SBS was added to the molten mixture of the remnants of the SDA process, the modifying additive and the bonding reinforcing agent, and the mixture was stirred for 30 minutes to 60 minutes to ensure homogeneous dispersibility. Stirring after the addition of SBR or SBS is preferably carried out at a temperature of 200 DEG C or lower, specifically in the range of 170 DEG C to 180 DEG C.
The vulcanization process was completed by adding sulfur and a vulcanization accelerator to the thus-formed mixture and stirring at a temperature of 150 to 200 degrees Celsius for 30 minutes to 60 minutes to prepare an asphalt binder composition according to the present invention.
(2) Property evaluation method for the examples and comparative examples according to the present invention
The asphalt mixture according to the present invention manufactured through the above process was evaluated for moisture resistance through a moisture sensitivity (tensile strength ratio) test proposed in AASHTO T 283.
In order to evaluate the plastic deformation resistance of the material of the present invention, an experiment was conducted according to KS F 2374 "Wheel-tracking test method of asphalt mixture", and resistance to plastic deformation was measured through dynamic stability.
To evaluate the resistance to fatigue cracking, the resistance to cracking was evaluated by measuring the number of repeated loads at the same load level (2,000 ms) through the method presented in AASHTO T 321-07.
Tests were conducted on the examples of the asphalt mixture composition according to the present invention by applying the test method described above.
(3) According to the present invention In the embodiment Test results for
1) < Examples 1 and 2 >
Examples 1 and 2 are the asphalt mixed compositions according to the present invention, which were prepared by mixing the general granite aggregate and the asphalt binder composition according to the above-described manufacturing method, and the specific composition ratios thereof are shown in Table 1 below.
(100% by weight)
4.85 wt% modifying additive;
0.15% by weight of an associative reinforcing agent;
3.0% by weight of powdered SBR;
0.3% by weight of sulfur; And
0.1% by weight of a vulcanization accelerator
4.85 wt% modifying additive;
0.15% by weight of an associative reinforcing agent;
SBS 3.0 wt%;
0.3% by weight of sulfur; And
0.1% by weight of a vulcanization accelerator
In the composition ratio of the asphalt binder composition described in Table 1 above, the content of residues, modifying additives, bonding enhancer, SBR, SBS, sulfur and vulcanization accelerator in the SDA process is 100% by weight for the asphalt binder composition, ≪ / RTI >
The moisture sensitivity, the plastic deformation resistance, and the fatigue crack resistance of the asphalt mixed composition of the present invention were evaluated in Examples 1 and 2. Table 3 below shows the results of the performance evaluations of Examples 1 and 2 of the present invention.
2) < Comparative Examples 1 and 2 >
Comparative Example 1 (Conventional asphalt mixture)
A general asphalt mixture (the same aggregate and asphalt binder ratio) having a composition ratio of 95.3% by weight of aggregate and 4.7% by weight of asphalt binder to the entire asphalt mixture was used as Comparative Example 1, and the same as that of the embodiment of the present invention The test results are shown in Table 2 below.
Comparative Example 2 (Conventional high performance asphalt mixture)
(SK Corporation, product name: SUPERPALT) having a composition ratio of 95.3% by weight of aggregate and 4.7% by weight of conventional high-performance asphalt binder (product name: Superphalt (PG 76-22) The results are shown in Table 2. The results are shown in Table 2 below. The superphalt used in Comparative Example 2 consists of 92 to 94% by weight of common straight asphalt and 6 to 8% by weight of SBS for the entire asphalt binder.
(AASHTO T 283)
(KS F 2374)
N f
(AASHTO T 321-07)
In the case of moisture sensitivity (tensile strength ratio), Examples 1 and 2 of the present invention were found to have resistance to moisture superior to that of Comparative Example 1 by about 20%, and comparable to or superior to Comparative Example 2 Water resistance. It was also found that the asphalt mixed compositions according to Examples 1 and 2 of the present invention were superior to Comparative Example 1 by about 2.5 to 3 times in fatigue crack resistance at the same load level (about 2000 ms) It was found that the improvement was equal to or better than that of Example 2.
In the plastic deformation resistance, the comparative examples according to the prior art exhibited dynamic stabilities of 2,700 mm / cycle (Comparative Example 1) and 3,900 mm / cycle (Comparative Example 2), respectively, while the asphalt mixed composition according to the present invention had a dynamic stability of 4,200 (Example 1) and 4,600 (Example 2) mm / cycle. Thus, it was confirmed that the present invention exhibited excellent coin stability of about 20 to 30% or more, and superiority in plastic deformation, over the prior art.
As described above, the present invention provides a low-cost, high-performance asphalt mixed composition improved in plastic deformation resistance and fatigue crack resistance due to excellent flexibility and elasticity while using residues generated in the SDA process.
Claims (9)
2 to 8% by weight of an asphalt binder composition comprising residues of the SDA process; And
And 92 to 98% by weight of the aggregate.
The asphalt binder composition comprises 90 to 95% by weight of the residue of the SDA process, 1 to 7% by weight of the modifying additive, 0.1 to 1.0% by weight of the bonding additive, 0.1 to 1.0% by weight of the binding additive, SBR and SBS, assuming that the total weight of the asphalt binder composition is 100% , 0.1 to 1.0 wt% of sulfur, and 0.1 to 0.5 wt% of a vulcanization accelerator, based on the total weight of the asphalt mixture.
The asphalt binder composition comprises 91.6% by weight of the residue of the SDA process, 4.85% by weight of the modifying additive, 0.15% by weight of the bonding additive, 3.0% by weight of powder SBR, 0.3% by weight of sulfur, , And 0.1 wt% of a vulcanization accelerator.
The asphalt binder composition comprises 91.6% by weight of the residue of the SDA process, 4.85% by weight of modifying additives, 0.15% by weight of bonding adjuvant, 3.0% by weight of SBS, 0.3% by weight of sulfur, And 0.1 wt% of a vulcanization accelerator.
Wherein the modifying additive is a modifying additive for softening comprising one or more oils selected from the group consisting of aromatic oil, naphthenic oil, paraffin oil and white oil.
The modifying additive is a natural oil, not an oil produced from petroleum.
Wherein the vulcanization accelerator is at least one selected from the group consisting of a thiazole vulcanization accelerator, a guanidine vulcanization accelerator, a sulfenamide vulcanization accelerator, and a thiuram vulcanization accelerator Asphalt mixed composition.
2 to 8% by weight of an asphalt binder composition comprising residues of the SDA process and 92 to 98% by weight of an aggregate;
Placing the asphalt binder composition in an oven heated to 150 to 160 degrees Celsius for 60 to 90 minutes, heating the aggregate to an oven heated to 160 to 180 degrees Celsius for at least 4 hours, mixing the asphalt binder composition and the aggregate;
Wherein at least 95% of the aggregate is mixed so as to be covered by the asphalt binder composition.
When the total weight of the asphalt binder composition is 100% by weight,
A melt mixing step of melt mixing 1 to 7% by weight of the modifying additive and 0.1 to 1.0% by weight of the bonding reinforcing agent in 90 to 95% by weight of the residue of the SDA process; Further comprising 1.0 to 3.0% by weight of one or more kinds of materials selected from the group consisting of SBR and SBS to the molten mixture produced by the melt mixing step, followed by stirring and mixing; And vulcanizing the vulcanization step by adding 0.1 to 1.0% by weight of sulfur and 0.1 to 0.5% by weight of a vulcanization accelerator to the mixture by the mixing step and the stirring and mixing step.
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