CN110791111A - Composite modified asphalt for high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer - Google Patents
Composite modified asphalt for high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer Download PDFInfo
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Abstract
The invention discloses a composite modified asphalt for a high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer, which comprises the following components in percentage by weight: 70-79.8% of matrix asphalt, 15-20% of modified compound, 5-10% of component regulator and 0.2-0.4% of cross-linking agent; wherein the modified composite is a mixture comprising styrene-butadiene-styrene copolymer, i.e., SBS copolymer, reclaimed rubber particles, weathering agent and interfacial enhancer. The composite modifier prepared from the SBS copolymer, the reclaimed rubber, the aging resistant agent and the interface reinforcing agent can comprehensively improve the stability, the aging resistance, the weather resistance and the like of the matrix asphalt, and fully utilizes the waste tires to reduce the cost, so that the modified asphalt cement can be more suitable for waterproof sealing of high-speed railways; (2) the method firstly prepares the composite modifier and granulates the composite modifier, the interface reinforcing agent is beneficial to the association between the modifier and the matrix asphalt, the micro-nano dispersion of modifier molecules can be realized, the consumption of rubber is increased, and the tire pollution is reduced.
Description
Technical Field
The invention relates to composite modified asphalt, in particular to composite modified asphalt for a high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer, and belongs to the field of asphalt modification and asphalt concrete waterproof sealing layers for newly building or maintaining railway ballastless tracks.
Background
The roadbed is used as the foundation of a high-speed railway track structure, and the strength, the rigidity and the stability of the roadbed are important for ensuring the safe and stable running of a train. Research shows that the underwater infiltration into the roadbed not only can reduce the strength of the soil body of the roadbed, but also can lead the waterproof layer of the roadbed to crack irregularly, thus damaging the safety and stability of the roadbed. In order to ensure the driving safety, a great deal of capital is spent on maintaining and maintaining the roadbed every year. The high-speed railway is generally of a ballastless track structure, so that the maintenance of the roadbed is more difficult, and the consumed manpower and material resources are huge. Therefore, the protection of the roadbed is very important. Results of operations of the special Kazakh and the intercity high-speed rail of Kyok show that compared with a fiber concrete protective layer, the full-section asphalt concrete protective layer paved has the advantages of complete structure and better waterproof effect. However, it is considered that asphalt is an easily aged material and is easily affected by the weather environment, especially the aging effect of ultraviolet rays. Therefore, the development of asphalt materials having high weather resistance and satisfying the design service life of the railway roadbed is urgently required.
Currently, the common modified asphalt includes single modified asphalt such as rubber asphalt, SBS copolymer (styrene-butadiene-styrene copolymer) modified asphalt and the like, and is mainly produced and prepared based on the use requirements of the road asphalt pavement, more is designed based on mechanical properties, and the influence of weather conditions is less considered. However, the waterproof sealing layer of the asphalt concrete is used for cold regions with strong ultraviolet rays, and the ultraviolet aging has obvious influence on the performance of the asphalt concrete. In order to meet the 60-year use requirement of the railway foundation bed, the asphalt cement needs to be reasonably designed to be suitable for a high-speed railway.
The prior researches show that the SBS and rubber composite modified asphalt has good road performance, and meanwhile, the durability of the modified asphalt is improved by the shielding effect of carbon black in rubber on photo-oxygen. However, in the previous researches, crude rubber and SBS are mostly adopted for modification, and more are physically blended, but the compatibility of SBS and rubber powder with asphalt is poor, and the segregation phenomenon is easy to generate. The phenomenon is related to a three-dimensional network structure in the raw rubber powder, the micro-nano dispersion of the rubber powder in the preparation process of the modified asphalt is limited, the viscosity of a modified asphalt system is increased, and the raw rubber powder has poor surface activity and cannot be effectively associated with the asphalt or SBS copolymer. According to the preparation method of the anti-stretching and anti-aging reclaimed rubber provided by the patent CN108484970, the desulfurization of the crude rubber powder can effectively break the three-dimensional network structure in the rubber powder and increase the active groups in the rubber particles, but the preparation method does not relate to the field of modified asphalt. In addition, the patent CN103819918 discloses a composite high viscosity modified asphalt and a preparation method thereof, which provides that the modified composite is obtained by banburying SBS and desulfurized rubber particles, and the density difference between the modifier and the asphalt can be reduced by controlling the content of SBS and rubber powder, so as to obtain the high viscosity modified asphalt with higher storage stability, but the ratio of SBS is too large, the cost of the modified asphalt is higher, and the effectiveness of the modified asphalt for the waterproof sealing layer with high weather resistance requirement is still under study. Therefore, in order to meet the use requirement of the waterproof sealing layer of the high-speed railway, the weather resistance improvement of the existing SBS copolymer/rubber composite modified asphalt preparation process and method is especially necessary.
Disclosure of Invention
The invention aims to provide the composite modified asphalt for the high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer, which can prolong the service life of the asphalt concrete of the waterproof sealing layer.
In order to achieve the purpose, the invention specifically adopts the following technical scheme:
the composite modified asphalt for the high-weather-resistant high-speed railway asphalt concrete waterproof sealing layer comprises the following components in percentage by weight:
wherein the modified compound is a mixture of styrene-butadiene-styrene copolymer (SBS copolymer), reclaimed rubber particles, a weathering agent and an interface reinforcing agent.
Wherein:
the matrix asphalt is one or more of natural asphalt, petroleum asphalt or coal tar asphalt.
The modified compound comprises the following components in percentage by mass:
the SBS copolymer is one or a mixed copolymer of two of linear SBS copolymer and star SBS copolymer, and has average molecular weight of 80000-120000 g/mol.
The reclaimed rubber is reclaimed rubber particles obtained by curing and desulfurizing rubber powder processed by waste tires at high temperature through chemical reagents or mechanical strong shearing; the aging resistant agent is an inorganic nano material, including but not limited to nano zinc oxide and silver oxide.
The interface reinforcing agent is an interface transition agent containing a functional group which is combined with organic and inorganic bi-directionally, and includes but is not limited to an amino-hydrocarbon-based silane coupling agent and an epoxy-hydrocarbon-based silane coupling agent.
The component regulator is bio-oil containing epoxy groups obtained by refining vegetable oil.
The cross-linking agent is one or more of polyphosphoric acid, sulfur or dicumyl peroxide.
The invention also provides a preparation method of the composite modified asphalt for the high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer, which comprises the following steps:
1) the interfacial reinforcing agent is diluted by absolute ethyl alcohol, then the interfacial reinforcing agent is uniformly mixed with the aging resistant agent according to a proportion, and the mixture is uniformly mixed with the SBS copolymer and the reclaimed rubber particles according to a proportion after the absolute ethyl alcohol is completely volatilized, so that the full mechanochemical reaction among various substances of the mixture is ensured, the decomposition of the desulfurized rubber in the banburying process is avoided, and the reaction temperature is controlled to be 120-150 ℃ in the banburying process. The banburying time can be controlled within 15-40min according to the banburying temperature. The modified compound can be obtained through the steps, and modified compound particles can be obtained through mechanical granulation;
2) heating the matrix asphalt to 146-;
3) adding the modified composite particles into the mixed asphalt according to a proportion to obtain a mixture, stirring the mixture by using a stirrer until the mixture is uniform, and simultaneously increasing the temperature of the mixture to 160-180 ℃, thereby ensuring that the viscosity of the mixture is in a proper range in the preparation process. And then shearing the emulsified composite modified particles by using a high-speed shearing machine until the particles are melted and thinned, transferring the particles into a high-speed dispersion machine for stirring, adding a cross-linking agent in a proportion and times during the stirring process, and developing to obtain the composite modified asphalt for the high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer.
Wherein:
the step 3) of shearing the mixture at a high speed refers to shearing for 60-90 min under the condition that the shearing speed is 5000-8000 r/min so as to ensure that the modifier is fully swelled and reduce the aging of the asphalt in the shearing preparation process; the step 3) of moving to a high-speed dispersion machine for stirring refers to stirring for 90-180 min under the condition that the stirring speed is 500-1000 r/min.
Advantageous effects
Compared with the prior art, the invention has the following advantages:
(1) the composite modifier prepared from the SBS copolymer, the reclaimed rubber, the aging resistant agent and the interface reinforcing agent can comprehensively improve the stability, the aging resistance, the weather resistance and the like of the matrix asphalt, fully utilizes the waste tires to reduce the cost, and enables the modified asphalt cement to be more suitable for the waterproof sealing layer of the high-speed railway.
(2) The method firstly prepares the composite modifier and granulates the composite modifier, the interface reinforcing agent is beneficial to the association between the modifier and the matrix asphalt, the micro-nano dispersion of modifier molecules can be realized, the consumption of rubber is increased, and the tire pollution is reduced.
(3) The thermal storage stability of the composite modified asphalt is effectively improved with the aid of the cross-linking agent.
Detailed Description
Aiming at the defects of the existing modified asphalt, the invention adopts a modified compound consisting of SBS, reclaimed rubber, an aging resistant agent and an interface reinforcing agent according to a certain proportion to carry out compound modification on the matrix asphalt, wherein:
the reclaimed rubber prepared by recycling waste tires is subjected to desulfurization treatment, so that the peculiar smell of rubber powder can be obviously removed, and harmful gas emitted in the paving process is reduced;
the use of the aging resistant agent can improve the thermal oxidation resistance and ultraviolet aging resistance of the asphalt;
the interface reinforcing agent effectively enables the inorganic aging-resistant material and the organic modifier to be perfectly combined, and improves the light-oxygen shielding effect of the aging-resistant material on the asphalt, so that the aging resistance of the asphalt is improved to the maximum extent; meanwhile, the residual interface reinforcing agent can also improve the adhesion between the cementing material and the aggregate when the composite modified asphalt is used for preparing the asphalt mixture, and enhance the water loss resistance of the modified asphalt mixture, thereby improving the freeze-thaw resistance of the composite modified asphalt in the process of using the composite modified asphalt for the asphalt concrete sealing layer of the high-speed railway. Therefore, the weather resistance of the waterproof sealing layer concrete is improved in multiple directions, and the service life of the waterproof sealing layer concrete in alpine regions is prolonged.
Considering that the difference of the matrix asphalt is obvious at the present stage and the stability of the modified asphalt prepared by the matrix asphalt with less aromatic component is insufficient by combining the existing research results, the epoxy vegetable oil rich in light components is used for component adjustment.
The mixed material density of the SBS copolymer and the reclaimed rubber in a proper proportion is close to that of the asphalt, the formed mixture system is stable, and the composite modified asphalt has unprecedented excellent thermal storage stability by combining the use of the stabilizer.
The invention is further illustrated by the following examples, without limiting the scope of the claims to the examples.
Example 1
The composite modified asphalt (1#) for the high-weather-resistant high-speed railway asphalt concrete waterproof sealing layer is used for the high-speed railway asphalt concrete waterproof sealing layer and comprises the following components in parts by weight:
wherein the modified compound is a mixture of styrene-butadiene-styrene copolymer (SBS copolymer), reclaimed rubber particles, a weathering agent and an interface reinforcing agent.
Wherein:
the matrix asphalt is one or more of natural asphalt, petroleum asphalt or coal tar asphalt.
The modified compound comprises the following components in parts by mass:
the SBS copolymer is one or a mixed copolymer of two of linear SBS copolymer and star SBS copolymer, and has average molecular weight of 80000-120000 g/mol.
The reclaimed rubber is reclaimed rubber particles obtained by curing and desulfurizing rubber powder processed by waste tires at high temperature through chemical reagents or mechanical strong shearing; the aging resistant agent is an inorganic nano material, including but not limited to nano zinc oxide and silver oxide.
The interface reinforcing agent is an interface transition agent containing a functional group which is combined with organic and inorganic bi-directionally, and includes but is not limited to an amino-hydrocarbon-based silane coupling agent and an epoxy-hydrocarbon-based silane coupling agent.
The component regulator is bio-oil containing epoxy groups obtained by refining vegetable oil.
The cross-linking agent is one or more of polyphosphoric acid, sulfur or dicumyl peroxide.
The preparation method of the composite modified asphalt for the high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer comprises the following steps:
(1) diluting 2 parts by mass of silane coupling agent by using absolute ethyl alcohol, uniformly mixing the silane coupling agent with 8 parts by mass of aging resistant agent, uniformly mixing the silane coupling agent with 30 parts by mass of SBS copolymer and 60 parts by mass of regenerated colloidal particles after the alcohol is completely volatilized, controlling the reaction temperature at 120 ℃, mixing for 15min in an internal mixer to obtain a modified compound, and carrying out mechanical granulation to obtain modified compound particles;
(2) heating 79.8 parts by mass of double-dragon petroleum asphalt to 150 ℃, adding 5 parts by mass of component regulator, and uniformly mixing by using a stirrer to obtain mixed asphalt;
(3) adding 15 parts by mass of modified composite particles into the mixture, raising the temperature of the mixture to 160 ℃, carrying out high-speed shearing on the mixture by using a high-speed shearing machine, controlling the shearing speed to be 5000r/min, after shearing for 60min, melting and thinning the modified particles, transferring the mixture into a high-speed dispersion machine for stirring, adding 0.2 part by mass of a cross-linking agent into the mixture in a stirring process, controlling the stirring speed to be 600r/min, and stirring a development test piece for 90min to obtain the composite modified asphalt for the high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer.
Example 2
The composite modified asphalt (2#) for the high-weather-resistant high-speed railway asphalt concrete waterproof sealing layer is used for the high-speed railway asphalt concrete waterproof sealing layer and comprises the following components in parts by weight:
wherein the modified compound is a mixture of styrene-butadiene-styrene copolymer (SBS copolymer), reclaimed rubber particles, a weathering agent and an interface reinforcing agent.
Wherein:
the matrix asphalt is one or more of natural asphalt, petroleum asphalt or coal tar asphalt.
The modified compound comprises the following components in parts by mass:
the SBS copolymer is one or a mixed copolymer of two of linear SBS copolymer and star SBS copolymer, and has average molecular weight of 80000-120000 g/mol.
The reclaimed rubber is reclaimed rubber particles obtained by curing and desulfurizing rubber powder processed by waste tires at high temperature through chemical reagents or mechanical strong shearing; the aging resistant agent is an inorganic nano material, including but not limited to nano zinc oxide and silver oxide.
The interface reinforcing agent is an interface transition agent containing a functional group which is combined with organic and inorganic bi-directionally, and includes but is not limited to an amino-hydrocarbon-based silane coupling agent and an epoxy-hydrocarbon-based silane coupling agent.
The component regulator is bio-oil containing epoxy groups obtained by refining vegetable oil.
The cross-linking agent is one or more of polyphosphoric acid, sulfur or dicumyl peroxide.
The preparation method of the composite modified asphalt comprises the following steps:
(1) diluting 2 parts by mass of silane coupling agent by using absolute ethyl alcohol, uniformly mixing the silane coupling agent with 8 parts by mass of aging resistant agent, uniformly mixing the silane coupling agent with 40 parts by mass of SBS copolymer and 50 parts by mass of regenerated colloidal particles after the alcohol is completely volatilized, controlling the reaction temperature at 120 ℃, mixing for 15 minutes in an internal mixer to obtain a modified compound, and mechanically granulating to obtain modified compound particles;
(2) heating 74.7 parts by mass of middle-sea petroleum asphalt to 150 ℃, adding 10 parts by mass of component regulator, and uniformly mixing by using a stirrer to obtain mixed asphalt;
(3) adding 15 parts by mass of modified composite particles into mixed asphalt, raising the temperature of the mixture to 160 ℃, shearing the mixture at a high speed by using a high-speed shearing machine, controlling the shearing speed at 5000r/min, after shearing for 60 minutes, melting and thinning the modified particles, transferring the mixture into a high-speed dispersion machine for stirring, adding 0.3% of cross-linking agent in each time during the stirring process, controlling the stirring speed at 500r/min, stirring the developed test piece for 110 minutes, and thus preparing the composite modified asphalt for the high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer.
Example 3
The composite modified asphalt (3#) for the high-weather-resistant high-speed railway asphalt concrete waterproof sealing layer comprises the following components in parts by weight:
wherein the modified compound is a mixture of styrene-butadiene-styrene copolymer (SBS copolymer), reclaimed rubber particles, a weathering agent and an interface reinforcing agent.
Wherein:
the matrix asphalt is one or more of natural asphalt, petroleum asphalt or coal tar asphalt.
The modified compound comprises the following components in parts by mass:
the SBS copolymer is one or a mixed copolymer of two of linear SBS copolymer and star SBS copolymer, and has average molecular weight of 80000-120000 g/mol.
The reclaimed rubber is reclaimed rubber particles obtained by curing and desulfurizing rubber powder processed by waste tires at high temperature through chemical reagents or mechanical strong shearing; the aging resistant agent is an inorganic nano material, including but not limited to nano zinc oxide and silver oxide.
The interface reinforcing agent is an interface transition agent containing a functional group which is combined with organic and inorganic bi-directionally, and includes but is not limited to an amino-hydrocarbon-based silane coupling agent and an epoxy-hydrocarbon-based silane coupling agent.
The component regulator is bio-oil containing epoxy groups obtained by refining vegetable oil.
The cross-linking agent is one or more of polyphosphoric acid, sulfur or dicumyl peroxide.
The invention also provides a preparation method of the composite modified asphalt, which comprises the following steps:
(1) diluting 4 parts by mass of silane coupling agent by using absolute ethyl alcohol, uniformly mixing the silane coupling agent with 16 parts by mass of aging resistant agent, uniformly mixing the silane coupling agent with 40 parts by mass of SBS copolymer and 40 parts by mass of regenerated colloidal particles in proportion after the alcohol is completely volatilized, controlling the reaction temperature at 120 ℃, mixing in an internal mixer for 30 minutes to obtain a modified compound, and carrying out mechanical granulation to obtain modified compound particles;
(2) heating 70 parts by mass of middle-sea petroleum asphalt to 150 ℃, adding 9.7 parts by mass of component regulator, and uniformly mixing by using a stirrer to obtain mixed asphalt;
(3) adding 20 parts by mass of modified composite particles into mixed asphalt according to a proportion, raising the temperature of the mixture to 160 ℃, carrying out high-speed shearing on the mixture by using a high-speed shearing machine, controlling the shearing speed to be 7500r/min, after shearing for 60 minutes, melting and thinning the modified particles, transferring the mixture into a high-speed dispersion machine for stirring, adding 0.3 part by mass of a cross-linking agent in a stirring process, controlling the stirring speed to be 800r/min, and stirring a developed test piece for 180 minutes to obtain the composite modified asphalt for the high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer.
Example 4
The composite modified asphalt (4#) for the high-weather-resistant high-speed railway asphalt concrete waterproof sealing layer is used for the high-speed railway asphalt concrete waterproof sealing layer and comprises the following components in parts by weight:
wherein the modified compound is a mixture of styrene-butadiene-styrene copolymer (SBS copolymer), reclaimed rubber particles, a weathering agent and an interface reinforcing agent.
Wherein:
the matrix asphalt is one or more of natural asphalt, petroleum asphalt or coal tar asphalt.
The modified compound comprises the following components in parts by mass:
the SBS copolymer is one or a mixed copolymer of two of linear SBS copolymer and star SBS copolymer, and has average molecular weight of 80000-120000 g/mol.
The reclaimed rubber is reclaimed rubber particles obtained by curing and desulfurizing rubber powder processed by waste tires at high temperature through chemical reagents or mechanical strong shearing; the aging resistant agent is an inorganic nano material, including but not limited to nano zinc oxide and silver oxide.
The interface reinforcing agent is an interface transition agent containing a functional group which is combined with organic and inorganic bi-directionally, and includes but is not limited to an amino-hydrocarbon-based silane coupling agent and an epoxy-hydrocarbon-based silane coupling agent.
The component regulator is bio-oil containing epoxy groups obtained by refining vegetable oil.
The cross-linking agent is one or more of polyphosphoric acid, sulfur or dicumyl peroxide.
The invention also provides a preparation method of the composite modified asphalt, which comprises the following steps:
(1) diluting 4 parts by mass of silane coupling agent by using absolute ethyl alcohol, uniformly mixing the silane coupling agent with 16 parts by mass of aging resistant agent, uniformly mixing the silane coupling agent with 50 parts by mass of SBS copolymer and 30 parts by mass of regenerated colloidal particles after the alcohol is completely volatilized, controlling the reaction temperature at 120 ℃, mixing in an internal mixer for 30 minutes to obtain a modified compound, and performing mechanical granulation to obtain modified compound particles;
(2) heating 72 parts by mass of Ixol petroleum asphalt to 150 ℃, adding 7.6 parts by mass of component regulator, and uniformly mixing by using a stirrer to obtain mixed asphalt;
(3) adding 20 parts by mass of modified composite particles into mixed asphalt according to a proportion, raising the temperature of the mixture to 160 ℃, carrying out high-speed shearing on the mixture by using a high-speed shearing machine, controlling the shearing speed at 8000r/min, after shearing for 75 minutes, melting and thinning the modified particles, transferring the mixture into a high-speed dispersion machine for stirring, adding 0.4 part by mass of a cross-linking agent in each stirring process, controlling the stirring speed at 1000r/min, and stirring a developed test piece for 120 minutes to obtain the composite modified asphalt for the high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer.
In order to investigate the anti-aging performance of the composite modified asphalt prepared by the above method, the composite modified asphalt prepared by the above example was subjected to an aging test using a full-weather aging box, and the performance of the modified asphalt before and after multiple aging was evaluated using penetration and ductility tests, with the test results shown in table 1.
TABLE 1 Properties of composite modified asphalts obtained in examples 1 to 4
According to the test results in the table 1, the performance change of the composite modified asphalt in the whole weather aging process is obviously better than that of the SBS modified asphalt which is used most widely at the present stage, the ageing resistance of the asphalt is obviously improved by the addition of the ageing resistant agent and the desulfurized rubber powder, and the asphalt concrete prepared by matching with proper gradation is expected to become an ideal high-speed railway waterproof sealing layer material.
Claims (10)
1. The composite modified asphalt for the high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer is characterized in that: the composite modified asphalt is used for a waterproof sealing layer of asphalt concrete of a high-speed railway, and comprises the following components in percentage by weight:
70-79.8% of matrix asphalt,
15 to 20 percent of modified compound,
5 to 10 percent of component regulator,
0.2-0.4% of a cross-linking agent;
wherein the modified compound is a mixture of styrene-butadiene-styrene copolymer (SBS copolymer), reclaimed rubber particles, a weathering agent and an interface reinforcing agent.
2. The composite modified asphalt for the asphalt concrete waterproof sealing layer of the high-weather-resistant high-speed railway as claimed in claim 1, wherein: the matrix asphalt is one or more of natural asphalt, petroleum asphalt or coal tar asphalt.
3. The composite modified asphalt for the asphalt concrete waterproof sealing layer of the high-weather-resistant high-speed railway as claimed in claim 1, wherein: the modified compound comprises the following components in percentage by mass:
30 to 50 percent of SBS copolymer,
30 to 60 percent of reclaimed rubber,
8 to 16 percent of anti-aging agent,
2-4% of an interface reinforcing agent.
4. The composite modified asphalt for the asphalt concrete waterproof sealing layer of the high-weather-resistant high-speed railway as claimed in claim 1, wherein: the SBS copolymer is one or a mixed copolymer of two of linear SBS copolymer and star SBS copolymer, and has average molecular weight of 80000-120000 g/mol.
5. The composite modified asphalt for the asphalt concrete waterproof sealing layer of the high-weather-resistant high-speed railway as claimed in claim 1, wherein: the reclaimed rubber is reclaimed rubber particles obtained by curing and desulfurizing rubber powder processed by waste tires at high temperature through chemical reagents or mechanical strong shearing; the anti-aging agent is an inorganic nano material which is one or a combination of more of nano zinc oxide, nano silver oxide and nano titanium dioxide in any proportion.
6. The composite modified asphalt for the asphalt concrete waterproof sealing layer of the high-weather-resistant high-speed railway as claimed in claim 1, wherein: the interface reinforcing agent is an interface transition agent containing a functional group which is combined with organic and inorganic bi-directionally, and is one or a combination of more of an amino-hydrocarbon silane coupling agent, an epoxy-hydrocarbon silane coupling agent and a ureido-silane coupling agent in any proportion.
7. The composite modified asphalt for the high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer as claimed in claim 1, is characterized in that: the component regulator is bio-oil containing epoxy groups obtained by refining vegetable oil.
8. The composite modified asphalt for the high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer as claimed in claim 1, is characterized in that: the cross-linking agent is one or more of polyphosphoric acid, sulfur or dicumyl peroxide.
9. A method for preparing the composite modified asphalt of any one of claims 1 to 8, which is characterized by comprising the following steps: the method comprises the following steps:
1) diluting the interface reinforcing agent by using absolute ethyl alcohol, uniformly mixing the interface reinforcing agent with an aging resistant agent according to a proportion, uniformly mixing the interface reinforcing agent with an SBS copolymer and a regenerated colloidal particle according to a proportion after the absolute ethyl alcohol is completely volatilized, and banburying, wherein in the banburying process, the reaction temperature is controlled to be 120-150 ℃, the time is 15-40min, a modified compound is obtained through the steps, and modified compound particles are obtained through mechanical granulation;
2) heating the matrix asphalt to 146-154 ℃, adding the component regulator in proportion, and uniformly mixing by using a stirrer to obtain component-improved mixed asphalt;
3) adding the modified composite particles into the mixed asphalt according to a proportion to obtain a mixture, stirring the mixture by using a stirrer to be uniform, simultaneously increasing the temperature of the mixture to 160-180 ℃, thereby ensuring that the viscosity of the mixture is in a proper range in the preparation process, then shearing and emulsifying the composite modified particles by using a high-speed shearing machine until the composite modified particles are melted and thinned, then transferring the mixture to a high-speed dispersion machine for stirring, adding a cross-linking agent into the mixture according to a proportion in a grading manner in the stirring process, and developing to obtain the composite modified asphalt for the high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer.
10. The preparation method of the composite modified asphalt for the high-weather-resistance high-speed railway asphalt concrete waterproof sealing layer, which is disclosed by claim 9, is characterized by comprising the following steps of: the step 3) of shearing the mixture at a high speed refers to shearing for 60-90 min under the condition that the shearing speed is 5000-8000 r/min so as to ensure that the modifier is fully swelled and reduce the aging of the asphalt in the shearing preparation process; the step 3) of moving to a high-speed dispersion machine for stirring refers to stirring for 90-180 min under the condition that the stirring speed is 500-1000 r/min.
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