CN111647279B - Aging-resistant functionalized montmorillonite modified asphalt and preparation method thereof - Google Patents

Aging-resistant functionalized montmorillonite modified asphalt and preparation method thereof Download PDF

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CN111647279B
CN111647279B CN202010571171.5A CN202010571171A CN111647279B CN 111647279 B CN111647279 B CN 111647279B CN 202010571171 A CN202010571171 A CN 202010571171A CN 111647279 B CN111647279 B CN 111647279B
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CN111647279A (en
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梁波
石凯
张宽宽
郑健龙
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Changsha University of Science and Technology
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Abstract

The invention discloses an aging-resistant functionalized montmorillonite modified asphalt and a preparation method thereof, wherein the preparation method comprises the following steps: (1) the dopamine montmorillonite (PMMT) with multifunction is obtained after the montmorillonite is modified by dopamine. (2) The PMMT is added into the molten asphalt or the polymer modified asphalt for shearing and development to prepare the PMMT modified asphalt with high efficiency and aging resistance. (3) The asphalt is subjected to different aging treatments. Compared with styrene-butadiene-styrene block-forged copolymer (SBS) modified asphalt, the Viscosity Aging Index (VAI) of the PMMT/SBS modified asphalt at 135 ℃ can reach 50%, the track factor aging index (RAI) can reach 31%, the ratio is higher than that of the SBS modified asphalt and organic montmorillonite (OMMT)/SBS modified asphalt, and the PMMT modified asphalt shows excellent rheological property and ageing resistance.

Description

Aging-resistant functionalized montmorillonite modified asphalt and preparation method thereof
Technical Field
The invention belongs to the technical field of nano modified asphalt materials, and particularly relates to an aging-resistant functionalized montmorillonite modified asphalt and a preparation method thereof.
Background
At present, the polymer modified asphalt is the most widely applied modified asphalt in the construction of high-grade highways. The polymer endows the asphalt with good high-temperature and low-temperature performance and fatigue performance, so that the impact resistance, the cracking resistance and the abrasion resistance of the pavement are greatly improved. Styrene-butadiene-styrene block copolymer (SBS) is one of the best modifiers currently available. The interaction and modification effect of SBS and asphalt are attracting much attention and research. During the mixing, transportation, paving and use of the asphalt, the asphalt and SBS are affected by thermal oxygen and natural environment factors, so that thermal oxygen aging and ultraviolet aging of the asphalt and SBS occur, SBS decomposes, the asphalt becomes hard and brittle, pavement diseases are generated, and the service life of the asphalt pavement is reduced.
One of the effective ways to improve the aging resistance of asphalt by using additives. Layered silicates represented by montmorillonite have been widely investigated by researchers studying modified asphalt because of their two-dimensional structure and unique interlaminar environment. The montmorillonite and the polymer are used for modifying the asphalt, so that the gas-liquid barrier property and the heat resistance of the asphalt can be improved, and the comprehensive performance of the modified asphalt is obviously improved. Because the surface of the montmorillonite is hydrophilic and is difficult to disperse in polymer or asphalt, the montmorillonite needs to be modified. For example, the patent with the publication number of CN101817982A relates to a nano-sized organic montmorillonite and SBS composite modified asphalt and a preparation method thereof. The SBS composite modified asphalt provided by the invention comprises SBS modifier and asphalt, wherein organic montmorillonite is added, when the mass of the asphalt is 1, the mass ratio of the mixing amount of each modifier to the asphalt is as follows: SBS: 1-6%, organic montmorillonite: 1 to 10 percent. The patent utilizes montmorillonite and SBS to modify asphalt, and only asphalt with the same physical and chemical properties can be modified.
The marine mussels can be adhered to almost any substrate and are not affected by the type of the substrate, and the adhesion protein in byssus plays a key role. Dopamine and adhesion proteins have similar chemical structures and thus superior chemical affinities (Lee H et al science,2007,318(5849): 426-430). The bionic modification of dopamine is widely researched and applied in the fields of chemistry, biomedicine, pharmacy, sensor, battery manufacturing and the like, but is less researched in the application of modified asphalt. Dopamine has similar characteristics to melanin, can absorb ultraviolet rays and remove harmful substances brought by the ultraviolet rays, and has good capacity of removing free radicals. (Ju K-Y et al, biomacromolecules,2011,12(3): 625-. The aging mechanism of the high molecular material is related to thermal degradation or photodegradation and also related to the crosslinking of active free radicals.
The montmorillonite can improve the gas-liquid barrier property and the heat resistance of the asphalt and obviously improve the comprehensive performance of the modified asphalt. The polydopamine modified montmorillonite has an adsorption effect on free radicals, and can improve the compatibility of montmorillonite and asphalt and the anti-aging performance of the modified asphalt. The invention utilizes the advantages of the montmorillonite and dopamine surface modification material performance to improve a new way for preparing high-performance anti-aging modified asphalt.
Disclosure of Invention
The invention provides an aging-resistant functionalized montmorillonite modified asphalt and a preparation method thereof.
A preparation method of aging-resistant functionalized montmorillonite modified asphalt comprises the following steps:
step 1, modifying montmorillonite with dopamine to prepare dopamine montmorillonite;
step 2, heating the asphalt to 145-160 ℃, adding dopamine montmorillonite into the asphalt, wherein the mass ratio of the asphalt to the dopamine montmorillonite is 1: 0.02-0.12, uniformly dispersing the dopamine montmorillonite through shearing, and developing to obtain the dopamine montmorillonite modified asphalt.
Preferably, in the step 1, the preparation method of the montmorillonite suspension comprises the following steps of dispersing montmorillonite in deionized water, wherein the mass ratio of the montmorillonite to the deionized water is (3-6): 150-600, and uniformly stirring to obtain a montmorillonite suspension; the preparation method of the dopamine solution comprises the steps of adding dopamine into a Tris-HCl buffer solution of 0.05mol/L, and adjusting the pH value to 8-9 to obtain the dopamine solution; the preparation method of the dopamine montmorillonite comprises the steps of adding montmorillonite suspension into dopamine solution, wherein the mass ratio of montmorillonite to dopamine is 1.5-4: 1, uniformly stirring, precipitating a reaction product, washing and drying to obtain PMMT.
Preferably, in the step 2, the material is sheared for 20-40 min at a shearing rate of 2000-5000 rpm, and the development step is stirring for 60-100 min at a stirring speed of 400-700 rpm.
Preferably, in the step 2, if the polymer modified asphalt is prepared, the polymer modifier is added into the asphalt between the shearing and development steps, and after the polymer modifier is added, the asphalt is sheared for 80-150 min at a shearing rate of 2000-5000 rpm, wherein the mass ratio of the asphalt to the polymer modifier is 1: 0.02-0.1, and uniformly shearing and dispersing.
The invention also discloses an anti-aging functionalized montmorillonite modified asphalt prepared by the preparation method.
After the aging-resistant functionalized montmorillonite modified asphalt is prepared, aging treatment is carried out on the dopamine montmorillonite modified asphalt, the aging resistance of the dopamine montmorillonite modified asphalt is analyzed, and the asphalt aging treatment steps are as follows:
(a) short-term aging: according to a T0609-2011 asphalt film heating test or a T0610-2011 asphalt rotating film heating test in road engineering asphalt and asphalt mixture test specification (JTG E20-2011), an asphalt sample is placed into a (rotating) film oven to be aged for different durations at 163 ℃.
(b) And (3) long-term aging: according to a T0630-2011 pressure aging container accelerated asphalt aging test in road engineering asphalt and asphalt mixture test protocol (JTG E20-2011), an asphalt sample is put into a pressure aging instrument to be aged for 20h +/-10 min at 100 ℃ under 2.1MPa +/-0.1 MPa.
(c) Ultraviolet aging: injecting the short-term aged asphalt into a container of 85mm × 85mm to obtain an asphalt membrane of 2mm thickness, placing into a self-made ultraviolet aging oven under an ultraviolet lamp with 365nm wavelength (illumination intensity of 15 mW/cm)2) And carrying out ultraviolet aging for 120 h.
The montmorillonite has a two-dimensional lamellar structure, so that the immersion of heat, oxygen, ultraviolet light and the like in the external environment can be blocked, and the volatilization process of light components in the asphalt is increased. The dopamine is used for modifying the montmorillonite, so that the dispersity of the montmorillonite in the asphalt can be improved, meanwhile, the dopamine has the chemical affinity characteristics to different matrixes and the adsorbability characteristic to free radicals, the free radicals generated in the thermal oxidation and ultraviolet aging process of the asphalt are absorbed, and the aging of the asphalt and the degradation of the polymer modifier are relieved.
Compared with the prior art, the invention has the beneficial technical effects that:
(1) the modified doping amount of dopamine to montmorillonite is controlled in the following steps: 1.5-4 parts of dopamine: 1, the layer expanding effect of the montmorillonite and the dispersity of the montmorillonite in the asphalt can be better achieved. The mixing amount of the asphalt to PMMT is controlled in the following steps: PMMT ═ 1: 0.02-0.12, and the montmorillonite has a better modification effect on the asphalt.
(2) The invention firstly prepares PMMT, then adds PMMT into asphalt in a molten state, so that PMMT is uniformly distributed in the asphalt, and dopamine improves the dispersibility of montmorillonite in the asphalt.
(3) Dopamine endows the montmorillonite surface with chemical multifunctionality, and improves the synergistic effect between asphalt and polymer.
(4) The nano montmorillonite has the effect of blocking hot oxygen and light, and the dopamine has the effect of adsorbing free radicals generated by aging after chemical affinity to a matrix and oxidative autopolymerization, so that the synergistic improvement effect on the thermal-oxidative aging resistance and the light aging resistance of the asphalt and the polymer modifier is realized.
The PMMT modified asphalt has obvious heat, oxygen and light aging resistant effect. Compared with SBS modified asphalt (SBS-A), Viscosity Aging Index (VAI) of PMMT/SBS modified asphalt (PMMT/SBS-A) at 135 deg.C can reach 50%, and rutting factor aging index (RAI) can reach 31%; the VAI reduction amplitude of the organic montmorillonite (OMMT)/SBS modified asphalt (OMMT/SBS-A) at 135 ℃ can reach 42%, the RAI reduction amplitude can reach 20%, the aging index reduction amplitude of PMMT/SBS-A is larger than that of OMMT/SBS-A, and PMMT shows excellent aging resistance. The service performance of the asphalt pavement at the present stage is met, the pavement diseases caused by aging of the asphalt pavement are reduced, and the method has important significance for prolonging the service life of the asphalt pavement.
Drawings
FIG. 1 shows montmorillonite and montmorillonite: the dopamine mass ratio is 2: 1 PMMT (PMMT)1) And montmorillonite: the dopamine mass ratio is 5: 1 PMMT (PMMT)2) And montmorillonite: the dopamine mass ratio is 1: 1 PMMT (PMMT)3) Comparing the results of the X-ray diffraction test.
FIG. 2 shows montmorillonite and PMMT1、PMMT2And PMMT3The comparative scanning electron microscope test chart.
FIG. 3 is A graph comparing rutting factors and RAIs for base asphalt (BA-A) and PMMT/SBS-A under different aging conditions.
FIG. 4 is A graph comparing rut factors and RAIs for SBS-A and PMMT/SBS-A under different aging conditions.
FIG. 5 is A graph comparing the aged rut factors and RAI of sodium montmorillonite (NMMT)/SBS modified asphalt (NMMT/SBS-A) and PMMT/SBS-A under different aging conditions.
FIG. 6 is A graph comparing the aged rut factors and RAI of OMMT/SBS-A and PMMT/SBS-A under different aging conditions.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
Dispersing 1 part of dried montmorillonite in 200 parts of deionized water, and stirring at the speed of 1200r/min for 1 h. The preparation method of the Tris-HCl buffer solution comprises the steps of adding 2.484g of Tris into 200ml of deionized water, and adjusting the pH value of the solution to 8-9 by hydrochloric acid. And adding 0.5 part of dopamine into a prepared Tris-HCl buffer solution, and adjusting the pH value of the solution to 8-9. Quickly adding the montmorillonite suspension into a dopamine solution, stirring at the speed of 800r/min for 2 hours, sufficiently stirring at a high speed, washing the precipitate, and sufficiently drying at the temperature of 90-120 ℃ to obtain montmorillonite: the dopamine mass ratio is 2: 1 PMMT1。
Comparative example 1
Preparing montmorillonite: the dopamine mass ratio is 5: 1 PMMT2And preparing montmorillonite: the dopamine mass ratio is 1: 1 PMMT3The preparation procedure is as described in example 1.
FIG. 1 shows montmorillonite and PMMT1、PMMT2And PMMT3The results of the X-ray diffraction test of (1) are shown in the figure. Before modification, the interlayer spacing of the montmorillonite is 1.17 nm. Modified with dopamine, PMMT1Has a layer spacing of 1.73nm, PMMT2Has a layer spacing of 1.45nm and PMMT3Has an interlayer spacing of 1.79nm and is prepared from PMMT2To PMMT1The interlayer spacing of (a) increased by 19%, the interlayer spacing increased faster. By PMMT1To PMMT3The interlayer spacing of (2) is increased by 3%, and the increase of the interlayer spacing is obviously slowed down.
FIG. 2 shows montmorillonite and PMMT1、PMMT2And PMMT3The comparative scanning electron microscope test chart. Before modification, the montmorillonite is in an agglomerated state. Modified with dopamine, PMMT2A distinct agglomerated state. PMMT1The lamellar structures are highly separated. When the modified mixing amount is montmorillonite: dopa (DOPA)Amine mass ratio of 1: 1, PMMT3Irregular particles appear on the surface and are in an agglomerated state. Therefore, PMMT1The layer expanding effect is optimal.
Example 2
PMMT was obtained from example 11. Melting the obtained PMMT1In the modification of asphalt, 100 parts of asphalt is poured into a reaction vessel with a heating sleeve, heated to about 145-160 ℃, and then 4 parts of PMMT is added1Adding into molten asphalt for several times, and shearing at 4000r/min for 40min to obtain PMMT1Is well dispersed in the asphalt in a molten state. 4.5 parts of SBS are added to the asphalt in several portions and sheared at a shear rate of 4000r/min for 80 min. And then the growth is carried out for 60min at the stirring speed of 600r/min, and the aging-resistant PMMT/SBS-A is obtained. According to the regulations of national standard JTG E20-2011 road engineering asphalt and asphalt mixture test procedures, PMMT/SBS-A is subjected to short-term aging for 85min, long-term aging is carried out for 20h under the air pressure of 2.1MPA +/-0.1 MPA, and the illumination intensity is 15mW/cm2And (5) performing ultraviolet aging for 120 h.
And evaluating the influence of PMMT on the aging resistance of the asphalt by means of testing means such as Brinell rotary viscosity and a dynamic shear rheometer and aging indexes.
And analyzing the change of the viscosity value of the modified asphalt at 135 ℃ before and after aging, and evaluating the aging resistance of the modified asphalt through a Viscosity Aging Index (VAI). The calculation formula of VAI is shown in formula 1:
VAI＝(V-V0) V (formula 1)
In the formula: v-viscosity number before aging of the asphalt (mPas);
V0viscosity number (mPas) of the bitumen before ageing.
By complex modulus G*Phase angle delta and rutting factor G*The change of the rheological index of the modified asphalt along with the temperature is analyzed, and the influence of the anti-aging agent on the high-temperature rheological property of the asphalt is quantitatively researched. The anti-aging performance of different composite modified asphalts can be quantitatively analyzed through a rutting factor aging index (RAI). As shown in equation 2. A larger RAI indicates a poorer asphalt anti-aging performance.
Figure BDA0002549624140000051
In the formula:
Figure BDA0002549624140000052
-rut factor after ageing;
Figure BDA0002549624140000053
rut factor before aging.
Comparative example 2
Pouring 100 parts of asphalt into a reaction vessel of a heating sleeve, heating to 145-160 ℃, shearing at 4000r/min for 80min, and developing at 600r/min for 60min under stirring speed to obtain sheared Ba-A. The aging process and test means and aging index calculation are shown in example 1.
Analysis of the Brookfield viscosity test results shows that the viscosity value of the asphalt increases and the VAI increases as the aging degree increases. Under the same aging mode, compared with the viscosity value of BA-A, the viscosity value of PMMT/SBS-A is increased by 217-288%. The aging index of PMMT/SBS-A is 63% -64% lower than BA-A, the lower aging index shows that the aging resistance of PMMT/SBS-A is better than BA-A, and the datA is shown in Table 1.
FIG. 1 is A graph comparing rutting factors and RAI of BA-A and PMMT/SBS-A under different aging conditions. The RAI of PMMT/SBS-A in the temperature range of 52 ℃ to 82 ℃ is less than that of BA-A. Compared with the aging index of BA-A, the RAI of PMMT/SBS-A is reduced by 32-48% in short-term aging, 46-55% in long-term aging and 18-19% in ultraviolet aging, and PMMT/SBS-A shows better aging resistance, and the specific datA are shown in Table 2.
Comparative example 3
Pouring 100 parts of asphalt into A reaction vessel of A heating jacket, heating to about 145-160 ℃, adding 4.5 parts of SBS into the asphalt for several times, shearing at 4000r/min for 80min, and developing at 600r/min for 60min under stirring speed to obtain SBS-A. The aging process and test means and aging index calculation are shown in example 1.
Analysis of the Brookfield viscosity test results shows that the viscosity value of the asphalt increases and the VAI increases as the aging degree increases. Under the same aging mode, the viscosity value of PMMT/SBS-A is larger than that of SBS-A, and the viscosity amplification of PMMT/SBS-A reaches 15% -34%. The smaller the VAI, the better the anti-aging properties of the asphalt. The aging index of PMMT/SBS-A is 47% -50% lower than that of SBS-A, and the datA are shown in Table 1.
FIG. 2 is A graph comparing rutting factors and RAIs for SBS-A and PMMT/SBS-A under different aging conditions. The rutting factors of the PMMT/SBS-A are higher than those of the SBS-A, which shows that the high-temperature rutting resistance of the PMMT/SBS-A is better. The RAI of PMMT/SBS-A in the temperature range of 52 ℃ to 82 ℃ is less than that of SBS-A under the same ageing mode. Compared with the aging index of SBS-A, the RAI of PMMT/SBS-A is reduced by 22% -31% in short-term aging, 10% -29% in long-term aging and 12% -18% in ultraviolet aging, and the specific datA are shown in Table 2.
Comparative example 4
100 parts of asphalt is poured into a reaction vessel of a heating jacket, the heating is carried out to about 145-160 ℃, then 4 parts of NMMT is added into the asphalt in a molten state for a plurality of times, and the shearing is carried out for 40min at a shearing rate of 4000r/min, so that the NMMT is fully dispersed in the asphalt in the molten state. 4.5 parts of SBS are added to the bitumen in several portions and sheared at a shear rate of 4000r/min for 80 min. And then the growth is carried out for 60min at the stirring speed of 600r/min, and the NMMT/SBS-A is obtained. The aging process and test means and aging index calculation are shown in example 1.
The brookfield viscosity test results show that the viscosity value of the asphalt increases and the VAI increases as the aging degree deepens. Under the same aging mode, the viscosity value of PMMT/SBS-A is smaller than that of NMMT/SBS-A, which shows that PMMT can more effectively exert the barrier property of montmorillonite in asphalt. The VAI of PMMT/SBS-A is smaller than that of NMMT/SBS-A, and is reduced by 23% -27% compared with NMMT/SBS-A, and the datA are shown in Table 1.
FIG. 3 is A graph comparing the aged rut factors and RAI of NMMT/SBS-A and PMMT/SBS-A under different aging conditions. The track factors of PMMT/SBS-A are all higher than that of NMMT/SBS-A. Under the same aging mode, the aging index of PMMT/SBS-A at 52-82 ℃ is smaller than that of NMMT/SBS-A. Compared with the aging index of NMMT/SBS-A, the aging index of PMMT/SBS-A is reduced by 12% -26% in A short-term aging mode, reduced by 1% -24% in A long-term aging mode, and reduced by 7% -20% in an ultraviolet aging mode, and specific datA are shown in Table 2.
Comparative example 5
100 parts of asphalt is poured into a reaction vessel of a heating jacket, the heating is carried out to about 145-160 ℃, then 4 parts of OMMT is added into asphalt in a molten state for a plurality of times, and the shearing is carried out for 40min at a shearing rate of 4000r/min, so that the OMMT is fully dispersed in the asphalt in the molten state. 4.5 parts of SBS are added to the bitumen in several portions and sheared at a shear rate of 4000r/min for 80 min. Developing for 60min at A stirring speed of 600r/min to obtain OMMT/SBS-A. The aging process and test means and aging index calculation are shown in example 1.
As the degree of aging increases, the viscosity value of the asphalt increases and the VAI increases. Under the same aging mode, the viscosity values of PMMT/SBS-A are all smaller than that of OMMT/SBS-A, which shows that the dispersibility of PMMT in asphalt is better than that of OMMT. The VAI of PMMT/SBS-A is smaller than that of OMMT/SBS-A, and the VAI of PMMT/SBS-A is reduced by 14% -22% compared with that of OMMT/SBS-A, and the datA are shown in Table 1.
FIG. 4 is A graph comparing the aged rut factors and RAI of OMMT/SBS-A and PMMT/SBS-A under different aging conditions. The rutting factors of the PMMT/SBS-A are all higher than those of the OMMT/SBS-A, and the high-temperature rutting resistance of the PMMT/SBS-A is better. Under the same aging mode, the aging index of PMMT/SBS-A at 52-82 ℃ is smaller than that of OMMT/SBS-A. Compared with the aging index of OMMT/SBS-A, the aging index of PMMT/SBS-A is reduced by 3% -23% in A short-term aging mode, reduced by 0% -33% in A long-term aging mode, and reduced by 2% -12% in an ultraviolet aging mode, and the specific datA are shown in Table 2.
TABLE 1 viscosity number and VAI comparison (135%) of PMMT/SBS-A with the modified asphalt of the comparative example under different aging conditions
Figure BDA0002549624140000071
Note: 1. a is matrix asphalt, b is SBS modified asphalt, c is NMMT/SBS modified asphalt, d is OMMT/SBS modified asphalt, and e is PMMT/SBS modified asphalt.
2. Taking BA-A as an example, the VAI reduction rate of PMMT/SBS-A is calculated by (VAI)Ba-A-VAIPMMT/SBS-A)/VAIBa-AX 100. The VAI reduction rate of PMMT/SBS-A is expressed as percentage of VAI reduction of PMMT/SBS-A compared to the VAI of the other four asphalts (BA-A, SBS-A, NMMT/SBS-A, OMMT/SBS-A) and the thermal oxidation and UV aging resistance of PMMT/SBS-A is measured.
TABLE 2 RAI comparison of PMMT/SBS-A versus modified asphalt of comparative example under different aging conditions
Figure BDA0002549624140000081
Note: 1. a is matrix asphalt, b is SBS modified asphalt, c is NMMT/SBS modified asphalt, d is OMMT/SBS modified asphalt, and e is PMMT/SBS modified asphalt.
2. Taking BA-A as an example, the RAI reduction rate of PMMT/SBS-A is calculated by (RAI)Ba-A-VAIPMMT/SBS-A)/RAIBa-AX 100. The percent reduction in RAI of PMMT/SBS-A compared to that of the other four bitumens (BA-A, SBS-A, NMMT/SBS-A, OMMT/SBS-A) was expressed as the RAI reduction of PMMT/SBS-A, measured as the thermal oxidation and UV aging resistance of PMMT/SBS-A.

Claims (3)

1. The preparation method of the aging-resistant functionalized montmorillonite modified asphalt is characterized by comprising the following steps:
step 1, modifying montmorillonite with dopamine to prepare dopamine montmorillonite;
and 2, heating the asphalt to 145-160 ℃, adding the dopamine montmorillonite into the asphalt in a melting mode, wherein the mass ratio of the asphalt to the dopamine montmorillonite is 1: 0.02-0.12, adding SBS after shearing, shearing for 80-150 min at a shearing rate of 2000-5000 rpm, wherein the mass ratio of asphalt to SBS is 1: 0.02-0.1, uniformly dispersing the dopamine montmorillonite by shearing, and developing to obtain the dopamine montmorillonite modified asphalt;
in the step 1, the dopamine montmorillonite is prepared by quickly adding montmorillonite suspension to dopamine solution, wherein the mass ratio of montmorillonite to dopamine is 1.5-4: 1, and precipitating, washing and drying a reaction product to obtain a product dopamine montmorillonite; the preparation method of the montmorillonite suspension comprises the steps of dispersing montmorillonite in deionized water, wherein the mass ratio of the montmorillonite to the deionized water is (3-6): 150-600, and uniformly stirring to obtain a montmorillonite suspension; the preparation method of the dopamine solution comprises the steps of adding dopamine into a Tris-HCl buffer solution of 0.05mol/L, and adjusting the pH value to 8-9 to obtain the dopamine solution.
2. The preparation method of claim 1, wherein in the step 2, the dopamine montmorillonite is added into the asphalt and then is sheared at a shearing rate of 2000-5000 rpm for 20-40 min, and the development step is stirring at a stirring speed of 400-700 rpm for 60-100 min.
3. An aging-resistant functionalized montmorillonite modified asphalt, which is characterized by being prepared by the preparation method of claim 1 or 2.
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