KR101511237B1 - Low cost and environmentally friendly asphalt mixture for guss asphalt pavement using indonesian buton natural asphalt and manufacturing method thereof - Google Patents
Low cost and environmentally friendly asphalt mixture for guss asphalt pavement using indonesian buton natural asphalt and manufacturing method thereof Download PDFInfo
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- KR101511237B1 KR101511237B1 KR20140089748A KR20140089748A KR101511237B1 KR 101511237 B1 KR101511237 B1 KR 101511237B1 KR 20140089748 A KR20140089748 A KR 20140089748A KR 20140089748 A KR20140089748 A KR 20140089748A KR 101511237 B1 KR101511237 B1 KR 101511237B1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/06—Sulfur
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
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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
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
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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
- C08L2207/32—Properties characterising the ingredient of the composition containing low molecular weight liquid component
- C08L2207/324—Liquid component is low molecular weight polymer
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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
- C08L2555/00—Characteristics of bituminous mixtures
- C08L2555/20—Mixtures of bitumen and aggregate defined by their production temperatures, e.g. production of asphalt for road or pavement applications
Abstract
The present invention relates to an asphalt binder composition for guss asphalt paving and an aggregate, wherein the asphalt binder for goose asphalt pavement comprises buton natural asphalt; And an asphalt mixture for guss asphalt packaging, comprising a straight asphalt or a blown asphalt, and an asphalt binder composition for guss asphalt packaging; And melting the asphalt binder composition for gooser asphalt pavement with an aggregate, wherein the preparing the asphalt binder composition for gooser asphalt pavement comprises: (a) melting straight asphalt or blown asphalt; (b) melt-blending the asphalt natural asphalt crushed into molten straight asphalt or blown asphalt; (c) adding powdered SBR (styrene-butadiene rubber) and a viscosity improver to the molten mixture and agitating the mixture; And (d) adding sulfur and a vulcanization accelerator to the mixture and vulcanizing the asphalt mixture. According to the present invention, in addition to the basic function of goos asphalt forming a waterproof layer without compaction, the production temperature of the asphalt mixture is significantly lowered to prevent the asphalt aging and deformation of the river bed bridge, improve the watertightness performance, The construction cost can be remarkably reduced.
Description
The present invention relates to an asphalt mixture and a method of manufacturing the same, and more particularly, to a low-cost and eco-friendly asphalt mixture for asphalt pavement using natural asphalt of Indonesia BUTON and a method for producing the same.
Most of the long bridges are being constructed as suspension bridges or cable-stayed bridges that support the main bridges by cable. Bridge bridges are mostly constructed in the shape of steel plates to reduce the dead load and make the bridges as long as possible. In Europe and Japan, guss asphalt, a kind of mastic asphalt, has been widely applied to the bridge pavement of such a steel plate.
The guss asphalt pavement method was developed for the first time in Germany and was applied to the construction of autobahn. In Korea, it was the first pavement method for bridge steel plate in 1997, which was applied to the bridge of Gangsan bridge in Gwangyang port. In the 2000s, the construction of long-span bridges including the Seohae Grand Bridge and the Youngjong Grand Bridge has gradually increased the use of goos asphalt pavement.
Unlike rolled asphalt pavement, goos asphalt pavement does not require compaction process by rollers and it has a very low porosity, so it can exhibit waterproof effect to prevent water from entering the upper part of the bridge. It has been widely used as a highly efficient pavement method capable of realizing a lightweight bridge that does not require a concrete structure layer. The existing Goose asphalt pavement is composed of a composite pavement consisting of two layers of 4 ㎝ thick goose asphalt lower layer and 4 ㎝ thick modified asphalt upper layer.
However, in the conventional goos asphalt pavement method, in order to take advantage of the fact that the compaction process is not required, the asphalt is required to have very high fluidity, and the asphalt mixture must be heated to 250 ° C or higher. In this case, not only is the energy consumption consumed in the ascon heating very large, but also the asphalt hardens due to the characteristics of the asphalt whose aging progresses rapidly at a temperature of 200 ° C or higher, and the watertightness of the packaging layer is deteriorated. In addition, due to the high temperature of 230 ° C to 250 ° C, there is a high possibility of causing deformation of the steel plate during construction, and a high temperature heat can not escape to the outside of the package, resulting in swelling of the package. , And this phenomenon is likely to be broken immediately after the construction due to the reduction of the adhesive force between the steel plate and the package body.
In addition, in the case of conventional goos asphalt pavement, natural asphalt called TLA (Trinidad Lake Asphalt) is mixed with petroleum-based hard asphalt (penetration degree 20-40) about 30%. TLA should be imported from foreign countries, Rigid asphalt requires a special production process, which has a problem that the material cost is high and it is very difficult to improve the physical properties.
Accordingly, there is a need for a low cost, environmentally friendly asphalt mixture for asphalt paving and a method for manufacturing the same which can solve the above-mentioned problems caused by goos asphalt pavement.
The problem to be solved by the present invention is to reduce asphalt aging and deformation of a steel plate bridge by improving the watertight performance by significantly lowering the production temperature of the asphalt mixture in addition to the basic function of goos asphalt forming a waterproof layer without compaction, And a method for manufacturing the asphalt mixture for low cost and eco friendly goos asphalt pavement using natural asphalt of Indonesia.
One aspect of the present invention provides an asphalt binder composition for guss asphalt paving and an aggregate, wherein the asphalt binder for goose asphalt pavement comprises buton natural asphalt; And asphalt mixtures for guss asphalt packaging comprising straight asphalt or blown asphalt.
In another aspect of the present invention, there is provided an asphalt binder composition for a gooser asphalt pavement, comprising: (a) 10 to 50% by weight of butane natural asphalt; (b) 1 to 15% by weight of a viscosity improver; (c) 1 to 10% by weight of powdered styrene-butadiene rubber (SBR); (d) 0.1 to 1.0% by weight of sulfur; (e) 0.1 to 0.5% by weight of a vulcanization accelerator; And (f) the remainder of the asphalt or straight asphalt.
According to another aspect of the present invention, there is provided an asphalt binder composition for packaging guss asphalt, And melting the asphalt binder composition for gooser asphalt pavement with the aggregate, wherein the preparing the asphalt binder composition for gooser asphalt pavement comprises: (a) melting straight asphalt or blown asphalt; (b) melt-blending the asphalt natural asphalt crushed into molten straight asphalt or blown asphalt; (c) adding powdered SBR (styrene-butadiene rubber) and a viscosity improver to the molten mixture and agitating the mixture; And (d) adding sulfur and a vulcanization accelerator to the mixture and vulcanizing the asphalt mixture.
According to the present invention, it is possible to provide a waterproofing material which exhibits the strength and flexibility required in goos asphalt by using natural asphalt asphalt in general straight asphalt or blown asphalt, and which does not require compaction and prevents moisture in the upper layer of the bridge from flowing into the steel plate It is possible to provide a low cost and environmentally friendly asphalt mixture for asphalt pavement which can exhibit the effect.
Further, according to the present invention, in addition to the basic functions of goos asphalt, the production temperature of the asphalt mixture is significantly lowered to prevent the aging of the asphalt, to prevent the deformation of the bridge plate bridge due to the conventionally high installation temperature, Can be improved. Further, it is advantageous in that it can be used not only for the steel plate but also for the concrete pavement packaging, so that a separate waterproof sheet is not required.
Further, according to the present invention, it is possible to remarkably lower the production and construction temperature of goos asphalt, thereby reducing the energy consumption of petroleum-based fuels and gases, and achieving environmental benefits due to deterioration of harmful gas and odor generation All. In addition, since all of the imported TLA and the hard asphalt that require a special production process are not used, it is possible to remarkably reduce the construction cost, and it is possible to solve problems such as deformation of the steel plate and poor construction.
Further, according to the present invention, the viscosity of the asphalt binder can be lowered to increase the workability and to exhibit the packaging performance with a more uniform quality. In addition, it is possible to improve the structural stability by mitigating the thermal stress generated by the heat transmitted to the steel plate.
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 a more thorough 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. 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.
One embodiment of the present invention includes an asphalt binder composition for guss asphalt packaging and an aggregate, wherein the asphalt binder for gooser asphalt is selected from Buton natural asphalt; And asphalt mixtures for guss asphalt packaging comprising straight asphalt or blown asphalt.
The natural asphalt used in the present invention is natural asphalt produced from Indonesian bitumen. It is generally called asbuton, buttrolactone, carbonate solid, and has a rocky stone shape such as oil sands of Canada that can extract petroleum. Such asbestos natural asphalt contains asphalt in the range of 35 to 40%, and the remaining 60 to 65% is composed of other mineral such as mineral soil.
TLA (Trinidad Lake Asphalt) used in goos asphalt pavement is composed of about 32% of asphaltenes, about 35% of resin, about 21% of aromatics, about 3% of Saturate and about 9% of others. Buttone natural asphalt About 50 to 70% of asphaltenes, about 20 to 30% of resins, about 0 to 5% of aromatics, about 1 to 5% of Saturate, and 5 to 10% of others. As described above, the buttone natural asphalt used in the present invention has a remarkably low aromatics and resin content as compared with TLA, and is very resistant to deformation that may occur at high temperatures.
In the conventional goose asphalt pavement using TLA, hard asphalt (penetration degree 20 ~ 40) should be used to ensure strength and flexibility due to the characteristics of TLA. However, since the content of Aromatic and Saturate in BUTON natural asphalt is considerably lower than that of TLA, the present invention does not use costly hard asphalt, which is conventionally required for packaging of goos asphalt, but instead uses a commonly used straight asphalt or blown asphalt It is possible to secure the strength and flexibility of goos asphalt using hard asphalt.
Another embodiment of the present invention includes an asphalt binder composition for guss asphalt packaging and aggregate, the asphalt binder for goose asphalt pavement comprising: (a) 10 to 50 wt% butone natural asphalt; (b) 1 to 15% by weight of a viscosity improver; (c) 1 to 10% by weight of powdered styrene-butadiene rubber (SBR); (d) 0.1 to 1.0% by weight of sulfur; (e) 0.1 to 0.5% by weight of a vulcanization accelerator; And (f) the remainder of the asphalt or straight asphalt.
In one embodiment, the buttone natural asphalt may comprise from 10 to 50% by weight, preferably from 20 to 50% by weight, more preferably from 30 to 50% by weight, based on the total weight of the goeth asphalt paving asphalt binder composition. When the content of natural asphalt of buton is less than 10% by weight, the softening point of the binder is too low to prevent plastic deformation resistance as goeth asphalt. When the content exceeds 50% by weight, the viscosity of the asphalt can not be packed And high hardness may cause cracking of the package.
In the present invention, it is possible to form an asphalt binder composition for goose asphalt pavement by using buttone natural asphalt together with ordinary straight asphalt or blown asphalt.
Straight asphalt can be selected from various asphalt used for asphalt pavement such as AP-3 and AP-5.
In the present invention, the viscosity improver may lower the viscosity of the asphalt binder, lowering the production and the temperature of the asphalt mixture, and preventing the lowering of the high temperature property of the binder.
In one embodiment, the viscosity improver may comprise from 1 to 15% by weight, preferably from 1 to 10% by weight, more preferably from 1 to 5% by weight, based on the total weight of the asphalt binder composition for goeth asphalt pavement. When the content of the viscosity improver is less than 1% by weight, the viscosity lowering effect is not exhibited and the production and the construction temperature of the goeth-asphalt mixture can not be lowered. When the content is more than 15% by weight, It may cause a phenomenon of exuding to the surface of the layer and deterioration of adhesion between the package layer and the steel plate.
In one embodiment, the viscosity improver is selected from the group consisting of a polyethylene oligomer, a polyethylene wax, a vegetable wax, an animal wax, a surfactant, a fatty acid, a modified fatty acid, a stearic acid, a palm wax, a palm oil, a paraffin wax and a polyolefin wax Or more.
Polyethylenic oligomers are obtained by pyrolysis of polyethylene and are solid at room temperature and have a molecular weight of several hundreds of molecular weight that changes into a fluid at a higher temperature. The viscosity of the asphalt binder is lowered due to the fluidity above the melting point, The effect of lowering the temperature of the coating is exhibited. When the melting point is lower than the melting point, the binder is present in a solid state so that the binder does not cause deterioration of high temperature characteristics.
In one embodiment, the polyethylene-based oligomer may have a weight average molecular weight ranging from 500 to 1,000. When the weight average molecular weight of the polyethylene oligomer is less than 500, the hardness in the solid state is too low to lower the plastic deformation resistance of the asphalt. If the weight average molecular weight is more than 1,000, the binder hardening occurs at a low temperature, And so on.
In one embodiment, the polyethylene-based oligomer may have melting points in the range of 80 to 150 占 폚. If the melting point of the polyethylene oligomer is less than 80 캜, the resistance to high temperature plastic deformation of the binder may be lowered. If the melting point exceeds 150 캜, the nonuniformity of the construction may be caused under goos asphalt application conditions.
The powdered SBR used in the present invention not only exhibits the effect of increasing the plastic deformation at high temperature of the asphalt such as the increase of the softening point but also enhances the low temperature property by giving flexibility to goose asphalt by improving the elongation at low temperature.
In one embodiment, the powdered SBR may comprise 1 to 10% by weight, preferably 1 to 8% by weight, more preferably 1 to 5% by weight, based on the total weight of the asphalt binder composition for goose asphalt pavement. When the content of the powdery SBR is less than 1 wt%, the effect of modifying the asphalt can not be obtained. When the content of the SBR is more than 10 wt%, mixing with the asphalt may be impossible due to excessive viscosity increase.
In one embodiment, the powdered SBR may have a weight average molecular weight ranging from 300,000 to 1,000,000. When the weight average 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 weight average molecular weight exceeds 1,000,000, the powder may not be dispersed in the asphalt under the condition, have.
In one embodiment, 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.
Sulfur used in the present invention can serve to enhance the high temperature plastic deformation of asphalt, such as a rise in softening point, and a general sulfur having a melting point of 110 to 120 ° C and a solid powder state at room temperature can be used.
In one embodiment, sulfur may be present in an amount of from 0.1 to 1.0% by weight, preferably from 0.1 to 0.5% by weight, more preferably from 0.1 to 0.3% by weight, based on the total weight of the goeth asphalt paving asphalt binder composition. When the content of sulfur is less than 0.1% by weight, 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. When it exceeds 1.0% by weight, the asphalt becomes gelled due to excessive vulcanization, have.
In one embodiment, the sulfur may be in a powder state with a particle diameter greater than 0 mm but no greater 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, 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. Or more.
In one embodiment, the vulcanization accelerator may comprise from 0.1 to 0.5% by weight, preferably from 0.1 to 0.4% by weight, more preferably from 0.1 to 0.3% by weight, based on the total weight of the asphalt binder composition for goeth asphalt pavement. When the content of the vulcanization accelerator is less than 0.1% by weight, the effect of accelerating the vulcanization may not be exhibited. When the content of the vulcanization accelerator is more than 0.5% by weight, the additional vulcanization accelerating effect is not improved.
In one embodiment, the asphalt binder composition for goose asphalt pavement of the present invention comprises a styrene-butadiene-styrene (SBS) block copolymer, crumb rubber modifier (CRM), ethyl vinyl acetate (EVA), low-density polyethylene (LDPE) one or more additives selected from the group consisting of high-density polyethylene, polypropylene, ethylene acralate copolymer and an antioxidant.
In one embodiment, styrene-butadiene-styrene (SBS) block copolymers, crumb rubber modifiers (CRM), ethyl vinyl acetate (EVA) and the like are used to improve the watertightness, adhesion, tensile strength and elongation .
CRM is obtained by crushing waste tires. In the present invention, it is preferable to use CRM having a particle diameter of 0.08 to 1.00 mm, but the present invention is not limited thereto. 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 modifier.
Also, the SBS block copolymer is preferably, but not limited to, about 2 to 10 weight percent based on the total weight of the goeth asphalt binder composition. If the content of the SBS block copolymer is less than 2% by weight, the effect as a modifier is difficult to obtain. If the content of the SBS block copolymer is more than 10% by weight, excessively high viscosity may increase.
In one embodiment, LDPE, HDPE, polypropylene, ethylene acrylate copolymers, etc. may be used to increase the rigidity, i.e., resistance to deformation, of the goeth asphalt mixture. These additives may be used at a melting point of 150 占 폚 or less which is very widely used in the field of the ethylene-based resin.
In one embodiment, the asphalt binder composition for goose asphalt pavement and the aggregate may be included in the asphalt mixture for goose asphalt pavement at a weight ratio of 8:92 to 12:88.
Another embodiment of the present invention is directed to a method of making an asphalt binder composition for packaging guss asphalt; And melting the asphalt binder composition for gooser asphalt pavement with the aggregate, wherein the preparing the asphalt binder composition for gooser asphalt pavement comprises: (a) melting straight asphalt or blown asphalt; (b) melt-blending the asphalt natural asphalt crushed into molten straight asphalt or blown asphalt; (c) adding powdered SBR (styrene-butadiene rubber) and a viscosity improver to the molten mixture and agitating the mixture; And (d) adding sulfur and a vulcanization accelerator to the mixture and vulcanizing the asphalt mixture.
In the above embodiment, the respective constituents, the content and the operation effect are as described above in the embodiment relating to the goeth asphalt mixture, and a detailed description thereof is omitted in the present embodiment in order to avoid repetition.
In the melting step (a), it is possible to secure the fluidity by heating straight asphalt or blown asphalt.
In one embodiment, the melting step (a) can be carried out at a temperature ranging from 150 to 180 占 폚, preferably at a temperature of about 180 占 폚. When the temperature of the melting step (a) is lower than 150 ° C, the flowability of the straight asphalt or the blown asphalt can not be secured, so that it can not be mixed with the aggregate and the aggregate covering is not completely completed at the time of mixing If the temperature exceeds 180 ° C, straight asphalt or blown asphalt is rapidly oxidized and cured to reduce the resistance to cracking, and may cause premature failure of the package such as cracks.
In the melt mixing step (b), a molten mixture of buttone natural asphalt and straight asphalt can be formed by adding crushed buttone natural asphalt to molten straight asphalt while stirring.
In one embodiment, after the melt mixing step (b), further stirring may be carried out for 10 to 30 minutes. In this case, it is preferable that the additional stirring is performed at a temperature of 180 ° C or lower for easy control of the temperature.
In the stirring mixing step (c), the viscosity improver and the powdery SBR can be uniformly dispersed in the molten mixture of the natural buttone asphalt and the straight asphalt.
In one embodiment, the stirring and mixing step (c) may be carried out at a temperature in the range of 170-200 ° C, preferably 180-190 ° C. If the temperature of the stirring and mixing step (c) exceeds 200 ° C, the performance of asphalt and SBR may be deteriorated.
In one embodiment, the stirring and mixing step (c) may be performed for 30 to 60 minutes. If the mixing time is less than 30 minutes, the viscosity improver and the powder SBR may not be sufficiently mixed and it may be difficult to obtain a uniform dispersed phase. If the mixing time exceeds 60 minutes, aging of the asphalt and SBR may deteriorate performance.
In the vulcanization step (d), the vulcanization step can be carried out by adding sulfur and a vulcanization accelerator to the resulting mixture and stirring the mixture.
In one embodiment, the vulcanization step (d) can be carried out at a temperature in the range of from 150 to 200 ° C. When the temperature of the vulcanization step (d) is lower than 150 ° C, the flowability of the goeth asphalt binder composition is not ensured, so that the SBR is not uniformly dispersed in the asphalt and uniformly vulcanized. When the temperature exceeds 200 ° C, May occur.
In one embodiment, the vulcanization step (d) may be carried out for 30 to 60 minutes. When the vulcanization time is less than 30 minutes, the vulcanization of the SBR is not sufficiently progressed and sufficient reforming effect can not be obtained. If the vulcanization time exceeds 60 minutes, the aging of the asphalt and the SBR may degrade the performance.
In one embodiment, the asphalt binder composition for goose asphalt pavement and the aggregate may be mixed in a weight ratio of 8:92 to 12:88.
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.
Example
One. Goose Preparation and Properties Evaluation of Asphalt Binder Composition for Asphalt Pavement
(1) Manufacturing method
Straight asphalt is melted by heating to about 180 ° C and stirred with a stirrer. Continue stirring while slowly adding crushed butane asphalt to the stirred straight asphalt. After addition of butone asphalt, allow further mixing of the butone asphalt with straight asphalt for about 20 minutes while stirring. Since the temperature of the mixture is inevitably raised at the time of stirring, the additional heating is preferably carried out at 200 DEG C or lower for easy control of the temperature.
To a molten mixture of straight asphalt and buttone asphalt, a viscosity modifier, powdered SBR is added and stirred for 30 minutes to 60 minutes to obtain a homogeneous dispersed phase. The temperature at the stirring is preferably 200 占 폚 or less, for example, in the range of 170 to 200 占 폚.
Sulfur and a vulcanization accelerator are added to the mixture thus formed, and the mixture is stirred at a temperature of 150 to 200 ° C for 30 minutes to 60 minutes to complete the vulcanization process, thereby preparing an asphalt binder composition.
(2) Property evaluation method
In order to evaluate the physical properties of the finished goose asphalt binder composition, an elongation test and a bending beam rheometer test were conducted to evaluate the temperature crack resistance in a low temperature region, and the kinematic viscosity was further measured.
The Bending Beam Rheometer test is performed on samples subjected to short-term aging (RTFO aging) and long-term aging (PAV aging).
Here, short-term aging ages the asphalt binder through Rolling Thin Film Oven (RTFO), which simulates the asphalt aging of the asphalt mixture production and construction phases. In addition, long-term aging produces samples through Pressure Aging Vessel (PAV), which ages a sample after a short-term aging test. Long-term aging simulates the aging of asphalt pavements with a public age of about 5 to 10 years.
In addition, the Bending Beam Rheometer test is a test to measure the temperature crack resistance in the low temperature region. So far, asphalt binder tests have been carried out on a limited range of physical properties such as 25 ° C and 60 ° C. However, the asphalt pavement which is in common use is affected not only by the high temperature and the intermediate temperature but also by the low temperature condition below the freezing point, and the asphalt is very hard so that the behavior is similar to the elastic body. The deflection holding motive is mainly based on the beam theory to evaluate the properties of asphalt under these low temperature conditions, and the main purpose is to provide reference material for physical hardening of asphalt. The specimen is made from a sample subjected to short-term aging (RTFO) and a long-term aged (PAV) sample.
In actual tests, creep loads (constant loads) were applied to asphalt specimens in the form of beams under the lowest temperature conditions under which the packages would be experienced for a period of 240 seconds and creep stiffness (resistance to creep load) St) and the stiffness change rate (m-value).
(3) Results
1) Example 1
(Trade name: AP5), crushed bentonite asphalt, powdered SBR (LG Chem, product name: SBR1502), polyethylene oligomer (Lion Chemtech, product name: 104N), sulfur An asphalt binder composition was prepared by the above-described method using a vulcanizing accelerator (trade name: sulfur powder, product name: Taikyu Chemical Co., Ltd.) and a vulcanization accelerator (KUMHO Petrochemical, product name: KUMAC D). The produced samples were subjected to deflection retention synchronization test, elongation test and viscosity measurement at 200 ° C at -12 ° C and 5 ° C. The test results are shown in Table 1 below.
2) Comparative Example 1
An asphalt binder composition was prepared similarly to Example 1, except that a straight asphalt binder (AP5, product name: AP5) and TLA asphalt were used and no modifier was added as shown in Table 1 below, The physical properties were evaluated. The test results are shown in Table 1 below.
3) Comparative Example 2
As shown in the following Table 1, an asphalt binder composition was prepared in the same manner as in Example 1 except that no polyethylene oligomer was added, and physical properties were evaluated. The test results are shown in Table 1 below.
4) Comparative Example 3
As shown in the following Table 1, an asphalt binder composition was prepared similarly to Example 1, except that powdered SBR was not added and the physical properties were evaluated. The test results are shown in Table 1 below.
5) Comparative Example 4
As shown in the following Table 1, an asphalt binder composition was prepared similarly to Example 1 except that SBS block copolymer was used instead of powdered SBR, and physical properties were evaluated. The test results are shown in Table 1 below.
(MPa, -12 < 0 > C)
As can be seen in Table 1, Example 1 according to the present invention showed a relatively low -12 ° C BBR Stiffness test value and a high elongation at 5 ° C as compared with the comparative example, showing a very high crack resistance at low temperatures. This indicates that there is a very large effect in securing the watertightness. In addition, since the viscosity at 200 ° C is relatively low, the ease of operation at the time of construction can be obtained, and the viscosity at 250 ° C of Comparative Example 1 using the existing TLA goose asphalt is similar to that at 50 ° C, It can be seen that the effect can be shown.
Comparative Example 1 is a sample according to a conventional TLA goose asphalt production method, and the -12 ° C BBR Stiffness test value is very high, and the elongation at 5 ° C is also very low, which shows that the low temperature crack resistance is weaker than Example 1 according to the present invention Can be confirmed. In addition, in Comparative Example 1, the viscosity at 200 ° C is much higher than that in Example 1, indicating that the mixture production and the application temperature should be much higher than those in Example 1.
Comparative Example 2 does not include a polyolefin-based oligomer as a viscosity improver, and it is confirmed that the viscosity is so high that there is no effect of lowering the production and the temperature of the mixture.
Comparative Example 3 does not include powdered SBR. It can be seen that the -12 ° C BBR Stiffness test value is very high, and the elongation at 5 ° C is also very low, so that there is no complementary effect of low temperature crack resistance.
In Comparative Example 4, the SBS block copolymer was added instead of the powdered SBR. Although the SBS block copolymer had the effect of improving the -12 ° C BBR stiffness test value and the 5 ° C elongation value, the viscosity was very high, It can be seen that the lowering effect is not shown.
2. Goose Preparation and properties evaluation of asphalt mixture
(1) Method for manufacturing goose asphalt mixture
1) Example 2
An asphalt binder composition consisting of 60.6% by weight of straight asphalt, 30% by weight of butane natural asphalt, 6% by weight of powdered SBR, 3% by weight of polyethylene oligomer, 0.3% by weight of sulfur and 0.1% by weight of a vulcanization accelerator was prepared as in Example 1 Respectively. The asphalt binder composition was mixed into the aggregate heated to 200 ° C and mixed for 3 to 5 minutes to form a homogeneous dispersed phase while maintaining the mixing temperature at 200 ° C to prepare a Butongus asphalt mixture. The amount of the asphalt binder composition used was 9.0 wt% based on the total weight of the goeth asphalt mixture.
2) Example 3
An asphalt binder consisting of 60.6% by weight of straight asphalt, 30% by weight of butane natural asphalt, 1% by weight of powdery SBR, 5% by weight of SBS block copolymer, 3% by weight of polyethylene oligomer, 0.3% by weight of sulfur, The composition was prepared as in Example 1 above. The asphalt binder composition was mixed into the aggregate heated to 200 ° C and mixed at a mixing temperature of 200 ° C for 3 to 5 minutes so as to have homogeneous dispersibility with the modifying additive to prepare a Butongus asphalt mixture. The amount of the asphalt binder composition used was 9.0 wt% based on the total weight of the goeth asphalt mixture.
3) Comparative Example 5
Comparative Example 5 was prepared by mixing a conventional goose asphalt mixture, that is, a hardened asphalt (20 to 40 on the basis of invasion degree) with TLA, and measuring hardened asphalt and TLA in advance at 70: 30 wt% Hour and then mixed with the aggregate heated to 250 ° C to prepare a goos asphalt mixture. The goos asphalt mixture of Comparative Example 5 was prepared at a temperature of 240 to 260 ° C and a temperature of 40 to 60 ° C higher than the production temperatures of Examples 2 and 3. For comparison with the present invention, the amount of hardened asphalt and TLA used was adjusted to 9.0 wt% based on the total weight of the goeth asphalt mixture.
(2) Evaluation of physical properties
1) Evaluation of liquidity
As mentioned above, the Goose asphalt mixture does not require separate packaging compaction equipment because the mixture is constructed at high temperature and is constructed by the mixed flow performance without compaction. Therefore, the items that can evaluate the flow fluidity are selected as quality criteria and the flow fluidity of the goeth asphalt mixture is evaluated. In this case, the flow rate tester measures the temperature by time during the penetration of 5 cm of the penetration rod, and indicates the minimum temperature for the possibility of flow within 20 seconds, and determines the mixing and laying temperature based on the temperature.
For Examples 2 and 3 and Comparative Example 5, a fluidity evaluation test was conducted through flow-rate tests according to the asphalt content. In Examples 2 and 3, since the production temperature of the asphalt mixture is 40 to 60 ° C lower than that of Comparative Example 5, the flow rate of the asphalts was tested at every 10 ° C from 220 to 170 ° C. On the other hand, Comparative Example 5 was carried out at the production temperature of the existing goose asphalt mixture, so that the flow rate of the fly asphalt was tested at every 10 ° C from 240 to 170 ° C. The results are shown in Table 2 below. As shown in the following Table 2, it can be seen that Examples 2 and 3 can secure the fluidity even though the temperature is lower than that of Comparative Example 5. In particular, the fluidity evaluation at 180 ° C does not exceed the standard value of 20 seconds. This is because it is possible to secure the flow performance even at a low temperature by lowering the viscosity at high temperature by the influence of the added polyethylene oligomer. However, in Comparative Example 5, the time at which the penetration rod 5 cm was already penetrated at 190 ° C exceeded 20 seconds, and production and installation at a high temperature were inevitable. Therefore, the Goose asphalt mixture according to the present invention was evaluated to have a flowability at low temperature compared with the existing Goose asphalt mixture, and it was evaluated that the installation and production temperature can be reduced by 40 ° C or more as compared with the existing Goose asphalt mixture.
2) Penetration test
The penetration test was carried out in a cubic form of 7 × 7 × 7 cm squares with asphalt content, cured in a water bath at 40 ± 1 ° C for 30 minutes and then measured for 30 minutes. It is a test to evaluate strength.
As shown in Table 2 below, Example 2 exhibited the lowest intrusion amount, which is the result of mixing of powdered SBR. As mentioned above, powdered SBR is used together with sulfur and vulcanization accelerator to increase the softening point of the asphalt It is evaluated that it gives flexibility to goose asphalt and improves low temperature property by not only improving deformation but also improving elongation at low temperature. In Example 3, the penetration amount was increased as compared with Example 2, but the penetration amount was lower than Comparative Example 5, and the reference amount of 6 mm was satisfied. On the other hand, Comparative Example 5 satisfied the criterion of 6 mm, but showed higher intrusion than Comparative Examples 2 and 3.
3) Wheel tracking test
The wheel tracking test is an experiment to simulate the movement of a vehicle by applying the actual load to the specimen. The standard of the goos asphalt mixture should satisfy the dynamic stability 300cycle / mm or more. As shown in Table 2, Example 2 and Comparative Example 5 satisfied the criteria of 435 cycles / mm and 400 cycles / mm, respectively. In Example 3, the dynamic stability was the highest at 455 cycles / mm, indicating that the SBS block copolymer increased the viscosity at high temperature. Example 2 exhibited a higher dynamic stability than Comparative Example 5, which was similar to the penetration test, and in Example 2, powdered SBR was used with sulfur and a vulcanization accelerator to improve the high temperature plastic deformation of asphalt And it is evaluated that it is a result of giving flexibility to goose asphalt through improvement of elongation at low temperature and improving low temperature property.
4) Low temperature bending test
The actual asphalt pavement is affected not only by the high temperature and the medium temperature but also by the low temperature condition below the freezing point, and the asphalt is very hard so that it behaves like an elastic body. This test is performed to evaluate the resistance to temperature cracking at low temperature and is performed at 10 ° C to evaluate the fracture performance at low temperature. The reference value is 6.0 × 10 -3 or more and is a method of measuring the amount of deformation without breaking.
As shown in Table 2, in Examples 2 and 3 and Comparative Example 5, the fracture strain values met the criteria, but in Example 2, flexibility was imparted to goos asphalt by improving the elongation at low temperature, which is the performance of the powder SBR And it showed the highest deformation value. On the other hand, Comparative Example 5 showed excellent resistance to plastic deformation through the wheel tracking test and the penetration amount test, and was excellent in the degree of hardness, but was insufficient in securing the flexibility in low temperature.
Therefore, the present invention is superior to conventional goose asphalt mixtures in terms of flowability, plastic deformation resistance and resistance to temperature cracking at a temperature lower than 40 ° C compared to existing goose asphalt mixtures. Through this test, It was evaluated that it is excellent in resistance to breakage due to cracking.
(18.2 seconds)
(18.5 seconds)
(17.5 seconds)
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments or constructions. Various changes, substitutions and alterations can be made hereto without departing from the spirit and scope of the invention. It will be clear to those who have knowledge.
Claims (18)
The asphalt binder for goose asphalt pavement
Buton natural asphalt; And
Including asphalt (straight asphalt) or blown asphalt
Asphalt mixture for asphalt guss asphalt.
The asphalt binder for goose asphalt pavement
(a) 10 to 50 wt% butone natural asphalt;
(b) 1 to 15% by weight of a viscosity improver;
(c) 1 to 10% by weight of powdered styrene-butadiene rubber (SBR);
(d) 0.1 to 1.0% by weight of sulfur;
(e) 0.1 to 0.5% by weight of a vulcanization accelerator; And
(f) the remainder comprising straight asphalt or blown asphalt
Goose asphalt paving asphalt mixture.
The viscosity improving agent (b) may be at least one selected from the group consisting of a polyethylene-based oligomer, a polyethylene wax, a vegetable wax, an animal wax, a surfactant, a fatty acid, a modified fatty acid, stearic acid, palm wax, palm oil, paraffin wax and polyolefin wax ≪ RTI ID = 0.0 >
Goose asphalt paving asphalt mixture.
The viscosity improving agent (b) is a polyethylene-based oligomer having a weight average molecular weight of 500 to 1,000 and a melting point of 80 to 150 ° C
Goose asphalt paving asphalt mixture.
The powdery SBR (c) has a weight-average molecular weight of 300,000 to 1,000,000, and the powder has a size of more than 0 mm and not more than 1 mm.
Goose asphalt paving asphalt mixture.
Wherein the sulfur (d) is in a powder state having a particle diameter of more than 0 mm but not more than 0.3 mm
Goose asphalt paving asphalt mixture.
The vulcanization accelerator (e) 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 Characterized by
Goose asphalt paving asphalt mixture.
Butadiene-styrene (SBS) block copolymer, crumb rubber modifier (CRM), ethyl vinyl acetate (EVA), low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene, Characterized in that it further comprises at least one additive selected from the group consisting of an ethylene acralate copolymer and an antioxidant
Goose asphalt paving asphalt mixture.
Wherein the asphalt binder composition for goose asphalt pavement and the aggregate are contained in a weight ratio of 8:92 to 12:88
Goose asphalt paving asphalt mixture.
And melting the asphalt binder composition for gooser asphalt paving with an aggregate,
The step of preparing the asphalt binder for asphalt pavement comprises:
(a) melting straight asphalt or blown asphalt;
(b) melt-blending the asphalt natural asphalt crushed into molten straight asphalt or blown asphalt;
(c) adding powdered SBR (styrene-butadiene rubber) and a viscosity improver to the molten mixture and agitating the mixture; And
(d) adding sulfur and a vulcanization accelerator to the mixture and vulcanizing
A method for manufacturing an asphalt mixture for goose asphalt pavement.
The asphalt binder composition for goosal asphalt pavement comprises 10-50 wt% butone natural asphalt; 1 to 15% by weight of a viscosity improver; 1 to 10% by weight of powdered styrene-butadiene rubber (SBR); 0.1 to 1.0% by weight of sulfur; 0.1 to 0.5% by weight of a vulcanization accelerator; And the remaining straight asphalt or blown asphalt.
A method for manufacturing an asphalt mixture for goose asphalt pavement.
Characterized in that said melting step (a) is carried out by heating to a temperature in the range of from 150 to 180 ° C
A method for manufacturing an asphalt mixture for goose asphalt pavement.
Wherein the stirring and mixing step (c) is carried out at a temperature in the range of 170 to 200 DEG C for 30 to 60 minutes
A method for manufacturing an asphalt mixture for goose asphalt pavement.
Wherein the vulcanization step (d) is carried out at a temperature in the range of 150 to 200 DEG C for 30 to 60 minutes
A method for manufacturing an asphalt mixture for goose asphalt pavement.
Further comprising stirring for 10 to 30 minutes after said melt mixing step (b)
A method for manufacturing an asphalt mixture for goose asphalt pavement.
(Styrene-butadiene-styrene) block copolymer, crumb rubber modifier (CRM), ethyl vinyl acetate (EVA), low-density polyethylene (LDPE), high-density polyethylene (HDPE) Wherein at least one additive selected from the group consisting of polypropylene, ethylene acralate copolymer and antioxidant is further added, and the mixture is stirred and mixed
A method for manufacturing an asphalt mixture for goose asphalt pavement.
Wherein the viscosity improver includes at least one selected from the group consisting of a polyethylene-based oligomer, a polyethylene wax, a vegetable wax, an animal wax, a surfactant, a fatty acid, a modified fatty acid, stearic acid, palm wax, palm oil, paraffin wax and polyolefin wax Characterized by
A method for manufacturing an asphalt mixture for goose asphalt pavement.
Wherein the asphalt binder composition for goose asphalt pavement and the aggregate are mixed at a weight ratio of 8:92 to 12:88
A method for manufacturing an asphalt mixture for goose asphalt pavement.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106398244A (en) * | 2016-08-30 | 2017-02-15 | 北京东方雨虹防水技术股份有限公司 | Self-glued asphalt adhesive material, preparation method of self-glued asphalt adhesive material, and self-glued asphalt waterproof coiled material |
| KR101732098B1 (en) * | 2016-03-31 | 2017-05-04 | 최문선 | Asphalt modifier composition comprising the same, asphalt composition modified by the polymer and method preparing theereof |
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| CN106398244A (en) * | 2016-08-30 | 2017-02-15 | 北京东方雨虹防水技术股份有限公司 | Self-glued asphalt adhesive material, preparation method of self-glued asphalt adhesive material, and self-glued asphalt waterproof coiled material |
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