CN111748208A - High-adhesion modified asphalt composition and preparation method and application thereof - Google Patents
High-adhesion modified asphalt composition and preparation method and application thereof Download PDFInfo
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- CN111748208A CN111748208A CN202010486362.1A CN202010486362A CN111748208A CN 111748208 A CN111748208 A CN 111748208A CN 202010486362 A CN202010486362 A CN 202010486362A CN 111748208 A CN111748208 A CN 111748208A
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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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
- C08L2207/04—Thermoplastic elastomer
Abstract
The invention relates to the technical field of road engineering, in particular to a high-adhesion modified asphalt composition and a preparation method and application thereof. The modified asphalt composition comprises the following raw materials in parts by weight: 100 parts of asphalt; 2-10 parts of a thermoplastic elastomer; 4-8 parts of an adhesive; 1-4 parts of ASA resin; 0.1-1 part of vulcanized rubber. The thermoplastic elastomer is introduced into the high-adhesion asphalt composition and is matched with other substances such as an adhesive, ASA resin, vulcanized rubber and the like for use, so that the problem of loose threshing of the thin-layer overlay mixture due to insufficient adhesion of the asphalt cement and aging resistance is solved.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to a high-adhesion modified asphalt composition and a preparation method and application thereof.
Background
The thin overlay is one of the most common prevention and maintenance measures in highway engineering, and is characterized in that a 1-2 cm thin asphalt concrete overlay is additionally paved on the basis of the original pavement, so that pavement diseases can be effectively prevented and treated, the pavement evenness and the anti-skid performance are improved, the pavement service quality is integrally improved, and the service life of the road is prolonged. The main problem encountered by the prior thin-layer cover is that the cover is loose and falls off, namely, the surface aggregate is loose and falls off under the action of load due to insufficient adhesion of cementing material along with the increase of service life, so that the phenomenon that the pavement is blocked and falls off is caused, and the service life of the thin-layer cover is reduced. This is mainly due to the lack of adhesion and ageing resistance of the bituminous cements in the mix.
At present, in order to improve the road performance of asphalt cement, rubber powder or thermoplastic elastomer such as SBS modifier and other polymers such as polyethylene are usually added into the base asphalt to improve the performances of asphalt such as high-temperature stability and low-temperature crack resistance. However, the improvement effect on the adhesion performance of the asphalt is not obvious, and good adhesion cannot be formed on the aggregate surface, so that adhesion damage occurs, and therefore a certain amount of adhesive needs to be added into the asphalt to improve the adhesion performance of the asphalt.
Because of the high viscosity of the bituminous cements used in thin-layer overlay mixes, high mixing production temperatures are required, usually above 180 ℃, and short-term aging of the mix is easily accelerated by high production temperatures. Because the top coat is on the top layer of the pavement, long-term aging is easy to occur under the comprehensive action of air, sunlight and rainwater for a long time, the improvement of the anti-aging characteristic of the asphalt cement material has important significance for improving the service durability of the top coat.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a high adhesion modified asphalt composition, a preparation method and a use thereof, which solve the problems of the prior art.
In order to achieve the above and other related objects, one aspect of the present invention provides a modified asphalt composition, which comprises the following components in parts by weight:
in some embodiments of the invention, the asphalt is selected from the group consisting of petroleum asphalt; the penetration of the asphalt is 30-500 dmm.
In some embodiments of the invention, the thermoplastic elastomer is selected from the group consisting of styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, styrene-ethylene-butadiene-styrene copolymer, styrene-ethylene-propylene-styrene copolymer, and combinations of one or more thereof.
In some embodiments of the invention, the thermoplastic elastomer is selected from styrene-butadiene-styrene copolymers.
In some embodiments of the invention, the styrene-butadiene-styrene copolymer has a styrene content of 30% to 40% and an elongation at break of 700% to 1000%.
In some embodiments of the invention, the thermoplastic elastomer has a number average molecular weight of 6 to 12 ten thousand.
In some embodiments of the invention, the adhesive has a molecular weight of 2000 to 30000; the melting point is 100-140 ℃; the relative density is 1.2 to 1.4.
In some embodiments of the invention, the adhesive is selected from polyvinyl acetal polymers; the molecular weight of the polyvinyl acetal polymer is 2000-30000; the melting point is 100-140 ℃; the relative density is 1.2 to 1.4.
In some embodiments of the invention, the adhesive is selected from polyvinyl formal; the molecular weight of the polyvinyl formal is 3000-10000; the melting point is 100-130; the relative density is 1.2 to 1.3.
In some embodiments of the invention, the ASA resin has a molecular weight of from 6000 to 30000; the softening point is 90-100 ℃; the relative density is 1.0 to 1.1.
In some embodiments of the invention, the vulcanizate is selected from the group consisting of t-butyl phenol formaldehyde resins; the average molecular weight of the tert-butyl phenol formaldehyde resin is 550-750; the softening point is more than or equal to 70 ℃.
The invention also provides a preparation method of the modified asphalt composition, which comprises the steps of heating asphalt, and adding the thermoplastic elastomer, the vulcanized rubber and the adhesive and the ASA resin into the heated asphalt.
In some embodiments of the invention, the asphalt is heated to a temperature of 170 to 190 ℃.
In another aspect, the present invention provides the use of the modified asphalt composition of the present invention in the road surfacing field.
In another aspect, the present invention provides a road surface covering prepared from the modified asphalt composition of the present invention.
Detailed Description
The invention provides a high-adhesion asphalt composition for a thin-layer overlay through a large number of exploration experiments, and a preparation method and application thereof.
One aspect of the present invention provides a modified asphalt composition, the raw materials of which may include asphalt, thermoplastic elastomer, adhesive, ASA resin and vulcanized rubber.
The modified asphalt composition has high storage stability and high viscosity, the dynamic viscosity at 60 ℃ is higher than 400000Pa.s, the adhesion performance is good, the pull strength is higher than 1.5MPa, and the modified asphalt composition can provide enough adhesive force for aggregates and meet the technical requirements of asphalt cement for drainage pavements. The asphalt cement has good weather resistance and can be used as a thin-layer overlay asphalt cement.
The modified asphalt composition provided by the invention can comprise 100 parts of asphalt by weight, wherein the asphalt can be petroleum asphalt with a penetration ((25 ℃, 5s, 100g)/0.1mm) of 30-500 dmm, 30-100 dmm, 100-200 dmm, 200-300 dmm, 300-400 dmm or 400-500 dmm. In one embodiment of the present invention, the asphalt may be petroleum asphalt having a penetration of 30 to 100 dmm. In one embodiment of the invention, the asphalt may be petroleum asphalt No. 70.
The modified asphalt composition provided by the invention can comprise 2-10 parts by weight, 3-9 parts by weight, 4-8 parts by weight or 5-7 parts by weight of thermoplastic elastomer which is a block copolymer formed by polymerizing vinyl aromatic monomer (such as styrene) with aliphatic group containing at least two unsaturated olefins. The number average molecular weight of the thermoplastic elastomer is 1 to 20 ten thousand, 1 to 5 ten thousand, 6 to 10 ten thousand, 11 to 15 ten thousand, or 16 to 20 ten thousand. Specifically, the thermoplastic elastomer is selected from one or more of styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, styrene-ethylene-butadiene-styrene copolymer, and styrene-ethylene-propylene-styrene copolymer.
In a particular embodiment, the thermoplastic elastomer is selected from styrene-butadiene-styrene copolymers, namely SBS. Generally, it is a triblock copolymer having a molecular configuration of A-B-A type comprising polystyrene (S) as a terminal block and a butadiene (B) copolymer as an intermediate elastomeric block. The number average molecular weight of the styrene-butadiene-styrene copolymer can be generally 6 to 12 ten thousand, 6 to 8 ten thousand, 8 to 10 ten thousand, or 10 to 12 ten thousand. The styrene-butadiene-styrene copolymer has styrene content of 30-40%, elongation at break of 700-1000%, 700-800%, 800-900%, or 900-1000%. The test method can refer to GB/T2567-2008.
The modified asphalt composition provided by the invention comprises 4-8 parts by weight or 5-7 parts by weight of adhesive, wherein the adhesive is selected from polyvinyl acetal polymer and is high molecular polymer formed by condensation polymerization of polyvinyl alcohol and aldehyde compounds. The molecular weight of the adhesive is 2000-30000, 2000-5000, 5000-10000, 10000-15000, 15000-20000, 20000-25000, or 25000-30000. The melting point is 100-140 ℃, 100-120 ℃ or 120-140 ℃. The relative density is 1.2 to 1.4. The polyvinyl acetal polymer has a molecular weight of 2000-30000, 2000-5000, 5000-10000, 10000-15000, 15000-20000, 20000-25000, or 25000-30000. The melting point is 100-140 ℃, 100-120 ℃ or 120-140 ℃. The relative density is 1.2 to 1.4.
In a specific embodiment, the adhesive is selected from polyvinyl formal, and the molecular weight of the polyvinyl formal is 3000-10000, 3000-5000, 5000-8000, or 8000-10000. The melting point is 100-130 ℃, 100-110 ℃, 110-120 ℃ or 120-130 ℃. The relative density is 1.2 to 1.3.
The modified asphalt composition provided by the invention comprises 1-4 parts, 1.5-3.5 parts or 2-3 parts of ASA resin by weight of raw materials. The ASA resin has good weather resistance and is a terpolymer polymerized by acrylonitrile, styrene and acrylic ester. The molecular weight of the ASA resin is 6000-30000, 10000-15000, 15000-20000, 20000-25000, or 25000-30000. The softening point is 90-100 ℃. The relative density is 1.0 to 1.1.
The modified asphalt composition provided by the invention comprises 0.1-1 part, 0.2-0.9 part, 0.3-0.8 part, 0.4-0.7 part or 0.5-0.6 part of vulcanized rubber by weight of raw materials. The vulcanized rubber is selected from tert-butyl phenol formaldehyde resin. The tert-butyl phenol formaldehyde resin is vulcanized rubber which can form a three-dimensional grid structure when added into the asphalt, thereby increasing the compatibility stability of each component of the modified asphalt. The molecular weight of the tert-butyl phenol formaldehyde resin is 550-750, 550-570, 570-600, 600-650, 650-700, or 700-750. The softening point is more than or equal to 70 ℃. The melting point is 70-90 ℃, 70-80 ℃, or 80-90 ℃. The relative density is 1.0 to 1.5.
In a specific embodiment of the invention, the modified asphalt composition comprises the following raw materials in parts by weight:
the invention also provides a preparation method of the modified asphalt composition, which comprises the steps of heating asphalt, and adding the thermoplastic elastomer, the vulcanized rubber and the adhesive and the ASA resin into the heated asphalt. In the preparation method of the modified asphalt composition provided by the invention, the asphalt can be heated to 170-190 ℃, 170-180 ℃ or 180-190 ℃. Mixing with other components in the order of mixing the asphalt with the thermoplastic elastomer, the vulcanized rubber and the adhesive and the ASA resin in sequence. During the mixing process of the asphalt, the thermoplastic elastomer, the vulcanized rubber and the adhesive and the ASA resin in sequence, the thermoplastic elastomer and the vulcanized rubber can be firstly slowly added into the asphalt, and after high-speed stirring, the ASA resin and the adhesive are sequentially and slowly added for stirring reaction, so that the modified asphalt is prepared. The thermoplastic elastomer and the vulcanized rubber are slowly added into the asphalt, the high-speed stirring time can be 30-40 min, and the stirring time for adding the ASA resin and the adhesive, stirring, reacting and stirring can be 30-40 min. The stirring speed in the whole process is as follows: 1000 to 3000 rpm, 1000 to 2000 rpm, or 2000 to 3000 rpm. The temperature of the asphalt is controlled to be 180 ℃ in the whole process.
Another aspect of the invention provides the use of the high viscosity asphalt composition in the road surfacing field. The road overlay usually refers to a surface layer additionally paved on the original asphalt pavement, and the road overlay can usually improve the service quality of the asphalt pavement and improve various performances of the pavement. The road cover can be a thin layer cover, and the thickness of the road cover can be 1-2 cm. The road overlay is specifically a thin asphalt concrete overlay.
In another aspect, the present invention provides a road surface finish prepared from the high adhesion asphalt composition. The overlay may generally cover the asphalt road, thereby enhancing various performance characteristics of the asphalt road. One skilled in the art can select an appropriate method for forming the overlay on the surface of the roadway, for example, the high adhesion asphalt composition can be applied to the asphalt roadway by utilizing the fluidity of the asphalt composition at high temperature, and the overlay can be formed after cooling.
The modified asphalt composition of the invention is added with the traditional asphalt modifier, including thermoplastic elastomer, namely SBS modifier, and improves some conventional pavement performance indexes of the modified asphalt, thereby improving the high temperature stability, low temperature crack resistance, fatigue durability and water stability of the mixture. On the basis, the adhesive, namely polyvinyl formal, is added, so that the adhesive has excellent bonding performance, the adhesion performance of the modified asphalt is greatly improved, the modified asphalt can be firmly adsorbed on the surface of stone and is not separated from the stone, and the possibility of loosening of a thin-layer cover is reduced.
According to the modified asphalt composition, the vulcanized rubber is added, and because the addition amount of the modifiers such as the thermoplastic elastomer and the adhesive is high, in order to improve the compatibility stability of each component in the modified asphalt, the vulcanized rubber is added to enable the modified asphalt molecules to generate a proper crosslinking effect to form a certain network structure, so that the modified asphalt has good storage stability, and the phenomena such as segregation and the like are avoided, and the modified asphalt provides potential possibility for popularization and use.
The modified asphalt composition disclosed by the invention is added with the ASA resin, has good weather resistance, can improve the aging resistance of asphalt, can solve the performance attenuation caused by the aging of the asphalt in a thin-layer cover mixture when being applied to the thin-layer cover, prolongs the service life of the cover, and has good practical value.
The preparation method of the modified asphalt composition is simple to operate and easy to realize, and the modified asphalt prepared by the method has uniform appearance, no segregation phenomenon and stable performance.
The following examples are provided to further illustrate the advantageous effects of the present invention.
In order to make the objects, technical solutions and advantageous technical effects of the present invention more clear, the present invention is further described in detail below with reference to examples. However, it should be understood that the embodiments of the present invention are only for explaining the present invention and are not for limiting the present invention, and the embodiments of the present invention are not limited to the embodiments given in the specification. The examples were prepared under conventional conditions or conditions recommended by the material suppliers without specifying specific experimental conditions or operating conditions.
Furthermore, it is to be understood that one or more method steps mentioned in the present invention does not exclude that other method steps may also be present before or after the combined steps or that other method steps may also be inserted between these explicitly mentioned steps, unless otherwise indicated; it is also to be understood that a combined connection between one or more devices/apparatus as referred to in the present application does not exclude that further devices/apparatus may be present before or after the combined device/apparatus or that further devices/apparatus may be interposed between two devices/apparatus explicitly referred to, unless otherwise indicated. Moreover, unless otherwise indicated, the numbering of the various method steps is merely a convenient tool for identifying the various method steps, and is not intended to limit the order in which the method steps are arranged or the scope of the invention in which the invention may be practiced, and changes or modifications in the relative relationship may be made without substantially changing the technical content.
In the following examples, reagents, materials and instruments used are commercially available unless otherwise specified.
Unless otherwise stated, all the asphalts used were petroleum asphalt for Esso No. 70 road, the styrene-butadiene-styrene triblock copolymer was YH791 produced by Yueyang petrochemical company, the polyvinyl formal was PAV1799 produced by the institute of construction science in Shanghai, the ASA resin was XC-220 produced by BASF company, and the tert-butylphenol formaldehyde resin was 2404 produced by Shanghai Jinghai chemical Co.
Heating asphalt to 180 ℃, weighing the components with corresponding mass according to the weight parts of the components in the following examples 1-13, according to the preparation method of the modified asphalt composition, firstly slowly adding a thermoplastic elastomer (styrene-butadiene-styrene triblock copolymer (SBS)) and tert-butylphenol formaldehyde resin into the asphalt, stirring at a high speed for 30min, then stirring at a high speed at a rotating speed of 1000 r/min, and then adding ASA resin and an adhesive (polyvinyl formal) to stir for 30min to prepare the modified asphalt composition. And after the preparation, sampling and storing the modified asphalt. Specific examples are shown in table 1.
TABLE 1
And (3) according to the standard 'road engineering asphalt and asphalt mixture test procedure' (JTG E20-2011), performing performance tests on the prepared asphalt, wherein the performance tests comprise penetration degree, softening point, ductility, dynamic viscosity at 60 ℃, segregation softening point difference and film oven aging tests. The drawing test is carried out by adopting a drawing instrument according to ASTM D4541-2009. The test results are shown in Table 2.
TABLE 2
As can be seen from the data in Table 2 in examples 1-3, the increase of SBS content has a significant effect on the improvement of the toughness of asphalt, the softening point, 5 ℃ ductility and 60 ℃ dynamic viscosity of asphalt are significantly increased, the comprehensive performance of asphalt is improved, however, the tensile strength of asphalt is reduced, which means that the addition of SBS reduces the adhesion performance of asphalt to a certain extent, and therefore, a certain amount of adhesive needs to be added to improve the adhesion performance of asphalt.
From examples 4 to 7, the addition of the polyvinyl formal adhesive has a very obvious improvement on the drawing strength of asphalt, the drawing strength of the modified asphalt without the adhesive is only 0.84MPa, the drawing strength of the asphalt with 6% of the adhesive added thereto reaches 3.32MPa, and the drawing strength of the asphalt with 8% of the adhesive added thereto can even reach 4.55. Therefore, the adhesion performance of the asphalt is obviously improved by adding the adhesive.
From the examples 8 to 10, it can be seen that the addition of the ASA resin improves the aging resistance of the asphalt significantly, the modified asphalt without the ASA resin has a mass loss of 0.83% after aging, and the ductility of the modified asphalt changes from 28.5cm before aging to 12.1cm after aging, which indicates that the asphalt is hardened and aging is significant, while the modified asphalt with the ASA resin has a mass loss of less than 0.2%, and the ductility of the modified asphalt after aging is reduced and is also insignificant, which indicates that the asphalt aging degree is low.
From examples 11 to 13, it can be seen that the storage stability of the modified asphalt can be significantly improved by adding the vulcanized rubber tert-butyl phenol formaldehyde resin, and for the modified asphalt without adding the vulcanized rubber, the segregation softening point difference is as high as 4.2 ℃, which indicates that the asphalt segregation is serious, the storage stability of the asphalt is not good, and the problem can be significantly improved by adding the vulcanized rubber.
According to the above embodiment, the following components are selected in parts by weight: the preparation method is explained by 100 parts of asphalt, 6 parts of thermoplastic elastomer, 6 parts of adhesive, 2 parts of ASA resin and 0.5 part of tert-butyl phenol formaldehyde resin, and whether the preparation method is feasible or not is evaluated by observing whether the appearance of the asphalt is uniform and the surface is smooth under different stirring temperatures and stirring times. The specific implementation method and the observation result are shown in Table 3.
TABLE 3
| Temperature of mixing | Time of stirring | Appearance of asphalt | |
| Example 14 | 160℃ | 30+30min | The surface has granular substances, a little |
| Example 15 | 170℃ | 30+30min | The surface is basically smooth and the appearance is more uniform |
| Example 16 | 180℃ | 30+30min | Smooth surface and uniform appearance |
| Example 17 | 190℃ | 30+30min | Smooth surface and uniform appearance |
| Example 18 | 200℃ | 30+30min | Smooth surface, uniform appearance and large smoke |
| Example 19 | 180℃ | 15+15min | The surface has granular substances, much |
| Example 20 | 180℃ | 60+60min | Smooth surface and uniform appearance |
According to the experimental observation results shown in table 3, it can be found that the lower stirring temperature can cause the additives not to be completely melted and enter the modified asphalt, so that granular substances exist, and the higher stirring temperature can easily cause the light components of the asphalt to be volatilized more and generate larger smoke. Too short a stirring time may result in the additive not melting, so that the modified asphalt may not achieve the corresponding performance.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (10)
1. The modified asphalt composition comprises the following raw materials in parts by weight:
2. the modified asphalt composition of claim 1, wherein the asphalt is selected from the group consisting of petroleum asphalt; the penetration of the asphalt is 30-500 dmm.
3. The modified asphalt composition of claim 1, wherein the thermoplastic elastomer is selected from the group consisting of one or more of styrene-butadiene-styrene copolymer, styrene-isoprene-styrene copolymer, styrene-ethylene-butadiene-styrene copolymer, and styrene-ethylene-propylene-styrene copolymer.
4. The modified asphalt composition of claim 1, wherein the thermoplastic elastomer is selected from the group consisting of styrene-butadiene-styrene copolymers.
5. The modified asphalt composition of claim 4, wherein the styrene-butadiene-styrene copolymer has a styrene content of 30% to 40% and an elongation at break of 700% to 1000%.
6. The modified-asphalt composition of claim 1, further comprising any one or more of the following conditions:
A1) the number average molecular weight of the thermoplastic elastomer is 6 to 12 ten thousand;
A2) the molecular weight of the adhesive is 2000-30000; the melting point is 100-140 ℃; the relative density is 1.2-1.4;
A3) the adhesive is selected from polyvinyl acetal polymer; the molecular weight of the polyvinyl acetal polymer is 2000-30000; the melting point is 100-140 ℃; the relative density is 1.2-1.4;
A4) the adhesive is selected from polyvinyl formal; the molecular weight of the polyvinyl formal is 3000-10000; the melting point is 100-130; the relative density is 1.2-1.3;
A5) the molecular weight of the ASA resin is 6000-30000; the softening point is 90-100 ℃; the relative density is 1.0-1.1;
A6) the vulcanized rubber is selected from tert-butyl phenol formaldehyde resin; the average molecular weight of the tert-butyl phenol formaldehyde resin is 550-750; the softening point is more than or equal to 70 ℃.
7. The method for preparing the modified asphalt composition of claims 1-6, which comprises heating asphalt, and adding the thermoplastic elastomer, the vulcanized rubber and the adhesive and the ASA resin into the heated asphalt.
8. The method of claim 7, wherein the asphalt is heated at a temperature of 170 to 190 ℃.
9. Use of the modified asphalt composition according to any one of claims 1 to 6 in the field of road coverings.
10. A road surface covering prepared from the modified asphalt composition of any one of claims 1 to 6.
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