CN111747686A - Modified emulsified asphalt high-speed pavement mixture and preparation method thereof - Google Patents
Modified emulsified asphalt high-speed pavement mixture and preparation method thereof Download PDFInfo
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- CN111747686A CN111747686A CN202010663267.4A CN202010663267A CN111747686A CN 111747686 A CN111747686 A CN 111747686A CN 202010663267 A CN202010663267 A CN 202010663267A CN 111747686 A CN111747686 A CN 111747686A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
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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
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
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Abstract
The invention discloses a modified emulsified asphalt high-speed pavement mixture and a preparation method thereof, and relates to the technical field of asphalt mixtures. The modified emulsified asphalt high-speed pavement mixture comprises the following components in parts by weight: 10-15 parts of modified emulsified asphalt; 5-10 parts of mineral powder; 150-200 parts of coarse aggregate; 15-30 parts of fine aggregate; the modified emulsified asphalt is obtained by carrying out composite modification on base asphalt through SBS and PPA and then emulsifying. The preparation method of the mixture comprises the following steps: s1, adding the coarse aggregate, the fine aggregate and the mineral powder into a stirring tank, and uniformly stirring and mixing to obtain a mixture; s2, placing the mixture in a drying barrel, and drying at 120-170 ℃ to constant weight; and S3, pouring the dried mixture into a mixing device, adding the modified emulsified asphalt, and uniformly mixing at the rotating speed of 600-800r/min to obtain the modified emulsified asphalt. The modified emulsified asphalt prepared by the invention has better storage stability, and the mixture prepared by the modified emulsified asphalt has better pavement performance.
Description
Technical Field
The invention relates to the technical field of asphalt mixtures, in particular to a modified emulsified asphalt high-speed pavement mixture and a preparation method thereof.
Background
With the rapid development of road traffic, the load of vehicles is continuously increased, and more pavements adopt modified asphalt. The use of the modified asphalt can undoubtedly prolong the service life of roads, the modifiers commonly used in road construction at present comprise SBS, polyethylene, styrene butadiene rubber and the like, and the polymers can generate physical and chemical reactions with asphalt after being added into the asphalt, so that the performance of the asphalt is improved, the road performance of the asphalt mixture is also improved, and the service life of asphalt pavements is prolonged. Many practices and researches show that the temperature sensitivity and the catalytic temperature of the modified asphalt added with the high molecular polymer are reduced, the softening point is improved, and the crack resistance and the wear resistance are enhanced. Particularly, the excellent road performance of SBS modified asphalt is highly valued by road designers in the practical application process, and the use proportion of the modified asphalt is increased year by year in China and worldwide, and is about 60 percent at present.
The preparation process is suitable for industrial production and has strong reproducibility, and when the obtained SBS modified emulsified asphalt is used for a special adhesive layer of a newly-built road and a special adhesive for surface treatment, the prepared SBS modified emulsified asphalt has the advantages of high viscosity, high softening point and high solid content.
However, compared with heavy traffic road asphalt, SBS modified asphalt has high viscosity, high softening point and is difficult to emulsify, and the storage stability after emulsification is poor, which seriously restricts the popularization and application of the SBS modified asphalt. Therefore, a new solution is needed to solve the above problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the modified emulsified asphalt high-speed pavement mixture, the prepared modified emulsified asphalt has better storage stability, and the mixture prepared by adopting the modified emulsified asphalt has better pavement performance.
The second purpose of the invention is to provide a preparation method of the modified emulsified asphalt high-speed pavement mixture, which has the advantages of simple operation and suitability for large-scale production.
In order to achieve the first purpose, the invention provides the following technical scheme:
the modified emulsified asphalt high-speed pavement mixture comprises the following components in parts by weight: modified emulsified asphalt: 10-15 parts; mineral powder: 5-10 parts; coarse aggregate: 150-200 parts; fine aggregate: 15-30 parts;
the modified emulsified asphalt is obtained by carrying out composite modification on base asphalt through SBS and PPA and then emulsifying.
By adopting the technical scheme, the emulsified asphalt has the advantages of safety, energy conservation, environmental protection and the like compared with the hot asphalt, but the common emulsified asphalt has poorer pavement performance, the SBS modified asphalt has large emulsification difficulty and poor storage stability after emulsification.
The modified emulsified asphalt provided by the invention adopts a preparation process of modifying and emulsifying, the performance index of the obtained modified emulsified asphalt is close to that of hot asphalt, the modified emulsified asphalt has higher storage stability, and PPA is lower in price than SBS, so that the prepared asphalt mixture has lower cost and high economic benefit.
Further preferably, the modified emulsified asphalt is prepared by the following preparation steps:
a. heating the matrix asphalt to 170 ℃, adding an SBS modifier, uniformly stirring, putting into a 140 ℃ drying oven for swelling for 40min, then shearing at high speed for 1.5h under the conditions of 170-180 ℃ and 4000r/min, and finally keeping in a 140 ℃ drying oven for 40min to obtain SBS modified asphalt;
b. heating SBS modified asphalt to 158-165 deg.C, adding PPA, stirring for 20min, and maintaining temperature for 30-60min to obtain composite modified asphalt;
c. pouring stabilizer and emulsifier into 70 deg.C hot water, stirring, adjusting pH to 2-3 with hydrochloric acid, pouring the mixture into colloid mill, adding composite modified asphalt heated to 160 deg.C, and emulsifying for 2-5min to obtain modified emulsified asphalt.
By adopting the technical scheme, the matrix asphalt is heated and softened, the SBS modifier is added to prepare the SBS modified asphalt preliminarily, the obtained SBS modified asphalt is heated and softened and then the PPA is added to obtain the SBS/PPA composite modified asphalt, and finally the composite modified asphalt is emulsified by selecting the preparation method of firstly modifying and then emulsifying to obtain the modified emulsified asphalt. The compatibility of SBS and asphalt is improved, the storage stability of SBS modified emulsified asphalt is effectively improved, and the performance indexes are close to those of hot asphalt.
More preferably, the matrix asphalt is selected from one of petroleum asphalt, coal asphalt and lake asphalt.
By adopting the technical scheme, the modified emulsified asphalt obtained by adding the modifier into the asphalt for modification and emulsification has better storage stability and longer service life, and the prepared asphalt mixture has good road performance such as crack resistance, strength and the like.
Further preferably, the mineral powder grading range is as follows:
mesh (mm)13.29.54.752.361.180.60.30.15
Transmittance (%) 10097.463.348.534.426.612.38.4.
By adopting the technical scheme, the mineral powder plays a role in filling the asphalt mixture, gaps of the asphalt concrete, sometimes called as fillers, can be reduced, and the mineral powder and the asphalt in the gradation range jointly form asphalt mucilage, so that the strength and the stability of the asphalt concrete are improved.
Further preferably, the coarse aggregate is one selected from the group consisting of basalt aggregate, diabase aggregate and limestone aggregate, and has a particle size of 4.75 to 9.25 mm.
By adopting the technical scheme, the limestone has good processability, polishing performance and cementing performance, and can have good combination effect with the asphalt; the pavement performance of the asphalt mixture can be improved by adding a certain amount of diabase aggregates, and the price of diabase is lower than that of limestone, so that the cost can be reduced to a greater extent; most of the basalt is neutral, has many pores and is hard in texture; when the asphalt mixture is mixed for use, a good matching effect can be achieved, and the integral structural strength of the asphalt mixture is greatly improved. Meanwhile, the particle size of the basalt is larger than that of the limestone, and the basalt and the limestone are both formed by particles with different particle sizes, so that larger gaps are not easily formed among the basalt and the limestone, the whole body is compact, and the asphalt mixture has good and stable structural strength.
Further preferably, the fine aggregate is one selected from limestone aggregate, diabase aggregate and basalt aggregate, and has a particle size of 0 to 2.35 mm.
More preferably, in step c, corn stalk cellulose is also added into the colloid mill.
By adopting the technical scheme, when the cellulose is added into the modified emulsified asphalt, the cellulose can play roles of reinforcement, adhesion and stabilization, when the cellulose is added into the modified asphalt, the cellulose is mutually connected to form a three-dimensional structure, and the three-dimensional structure is relatively stable, so that the strength of the asphalt can be enhanced, the fluidity of the modified emulsified asphalt is obviously reduced, and the ductility value is reduced.
In order to achieve the second purpose, the invention provides the following technical scheme:
a preparation method of a modified emulsified asphalt high-speed pavement mixture comprises the following steps:
s1, adding the coarse aggregate, the fine aggregate and the mineral powder into a stirring tank, and uniformly stirring and mixing to obtain a mixture;
s2, placing the mixture in a drying barrel, and drying at 120-170 ℃ to constant weight;
and S3, pouring the dried mixture into a mixing device, adding the modified emulsified asphalt, and uniformly mixing at the rotating speed of 600-800r/min to obtain the modified emulsified asphalt.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) the modified emulsified asphalt adopts a preparation process of firstly modifying and then emulsifying, the performance index of the obtained modified emulsified asphalt is close to that of hot asphalt, the modified emulsified asphalt has higher storage stability, and PPA is lower in price than SBS, so that the prepared asphalt mixture has lower cost and high economic benefit;
(2) the PPA is introduced and is used as a polar component, so that the SBS can be crosslinked in the asphalt to form a stable space network structure, the compatibility of the SBS and the asphalt can be improved, and the storage stability of the modified asphalt is improved;
(3) the high-speed pavement mixture obtained by adopting the self-made modified emulsified asphalt as the base material and using the mineral powder, the coarse aggregates with different grain size grades and the fine aggregates in a matching manner has high strength, high stability, high track resistance and other excellent pavement performances.
Drawings
FIG. 1 is a flow chart of a preparation process of a modified emulsified asphalt high-speed pavement mixture in example 1 of the present application.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
In the invention, the modifier adopts linear SBS produced by the country petrochemical group, the holy petrochemical company and polyphosphoric acid sold by the chemical reagent factory of the metropolis;
the emulsifier is JY-R6M cation slow-breaking quick-setting asphalt emulsifier produced by Jiangsu Jinyang new material science and technology limited company, and the PH value is 8-10.
The stabilizer is commonly commercially available sulfur powder.
The mineral powder grading range is as follows:
mesh (mm)13.29.54.752.361.180.60.30.15
Transmittance (%) 10097.463.348.534.426.612.38.4.
Example 1: the modified emulsified asphalt high-speed pavement mixture comprises the following components in parts by weight as shown in Table 1 and shown in figure 1, and is prepared by the following steps:
s1, adding the coarse aggregate, the fine aggregate and the mineral powder into a stirring cylinder, and stirring and mixing for 1min at 800rpm to obtain a mixture;
s2, placing the mixture in a drying barrel, and drying at 120 ℃ to constant weight;
s3, pouring the dried mixture into a mixing device, adding the modified emulsified asphalt heated to 160 ℃, and mixing at the rotating speed of 600r/min for 10min to obtain the modified emulsified asphalt.
The preparation method of the modified emulsified asphalt in the embodiment comprises the following steps:
a. heating the matrix asphalt to 170 ℃, adding an SBS modifier accounting for 4.5 weight percent of the matrix asphalt, uniformly stirring, putting into a 140 ℃ drying oven for swelling for 40min, then shearing at high speed for 1.5h under the conditions of 170 ℃ and 4000r/min, and finally keeping in the 140 ℃ drying oven for 40min to obtain SBS modified asphalt;
b. heating SBS modified asphalt to 158 ℃, adding PPA (polyphthalamide) of 2 wt% of SBS, stirring for 20min, and then carrying out heat preservation development for 60min to obtain composite modified asphalt;
c. pouring 2 weight parts of stabilizer and 3 weight parts of emulsifier which respectively are the matrix asphalt into hot water of 70 ℃, uniformly stirring, adjusting the pH to 2 by hydrochloric acid, pouring the mixed solution into a colloid mill, adding the composite modified asphalt heated to 160 ℃, and emulsifying for 2min to obtain the modified emulsified asphalt.
In the embodiment, the matrix asphalt adopts petroleum asphalt, the coarse aggregate adopts basalt aggregate with the grain diameter of 4.75-9.25mm, and the fine aggregate adopts limestone aggregate with the grain diameter of 0-2.35 mm.
Examples 2 to 6: the difference between the modified emulsified asphalt mixture for the high-speed pavement and the embodiment 1 is that the components and the corresponding parts by weight are shown in the table 1.
TABLE 1 Components and parts by weight of examples 1-6
Example 7: the modified emulsified asphalt high-speed pavement mixture is different from the mixture in the example 1 in that the modified emulsified asphalt high-speed pavement mixture is prepared by the following steps:
s1, adding the coarse aggregate, the fine aggregate and the mineral powder into a stirring cylinder, and stirring and mixing for 1min at 800rpm to obtain a mixture;
s2, placing the mixture in a drying barrel, and drying at 170 ℃ to constant weight;
s3, pouring the dried mixture into a mixing device, adding the modified emulsified asphalt heated to 160 ℃, and mixing at the rotating speed of 800r/min for 8min to obtain the modified emulsified asphalt.
The preparation method of the modified emulsified asphalt in the embodiment comprises the following steps:
a. heating the matrix asphalt to 170 ℃, adding an SBS modifier accounting for 4.5 weight percent of the matrix asphalt, uniformly stirring, putting into a drying oven at 140 ℃ for swelling for 40min, then shearing at high speed for 1.5h under the conditions of 180 ℃ and 4000r/min, and finally keeping in the drying oven at 140 ℃ for 40min to obtain SBS modified asphalt;
b. heating SBS modified asphalt to 165 ℃, adding PPA (polyphthalamide) of 2 wt% of SBS, stirring for 20min, and then carrying out heat preservation development for 30min to obtain composite modified asphalt;
c. pouring 2 weight parts and 3 weight parts of stabilizer and emulsifier which respectively are the matrix asphalt into hot water at 70 ℃, uniformly stirring, adjusting the pH to 3 by hydrochloric acid, pouring the mixed solution into a colloid mill, adding the composite modified asphalt heated to 160 ℃, and emulsifying for 5min to obtain the modified emulsified asphalt.
In the embodiment, coal asphalt is adopted as matrix asphalt, diabase aggregates with the grain size of 4.75-9.25mm are adopted as coarse aggregates, and diabase aggregates with the grain size of 0-2.35mm are adopted as fine aggregates.
Example 8: a modified emulsified asphalt high-speed pavement mixture is different from the embodiment 1 in that lake asphalt is adopted as matrix asphalt, limestone aggregate with the grain diameter of 4.75-9.25mm is adopted as coarse aggregate, and limestone aggregate with the grain diameter of 0-2.35mm is adopted as fine aggregate.
Example 9: the difference between the modified emulsified asphalt high-speed pavement mixture and the embodiment 1 is that in the step c, corn stalk cellulose accounting for 2 weight percent of the matrix asphalt is also added into the colloid mill.
Comparative example 1: the modified emulsified asphalt mixture for high-speed pavement is different from the modified emulsified asphalt in the embodiment 1 in that the modified emulsified asphalt in the embodiment 1 is replaced by the SBS modified emulsified asphalt which is commonly purchased.
Comparative example 2: the difference between the modified emulsified asphalt mixture for the high-speed pavement and the embodiment 1 is that only SBS is used for modifying the matrix asphalt, and PPA is not added for modification.
Comparative example 3: a modified emulsified asphalt high-speed pavement mixture is different from the modified emulsified asphalt in example 1 in that when the modified emulsified asphalt is prepared, SBS and PPA are simultaneously added into base asphalt, namely in step a, PPA and SBS are simultaneously mixed with the base asphalt to be heated and modified.
Performance testing
The rubber asphalt mixtures obtained in examples 1 to 9 and comparative examples 1 to 3 were subjected to road-use performance tests, and the test results are shown in Table 2 below.
As can be seen from the test data in Table 2, compared with comparative examples 1-2, the storability of the SBS modified emulsified asphalt is obviously improved in examples 1-9 due to the addition of PPA, the storage stability of 5d is reduced from 6.4% to about 4.8%, and the reduction is higher.
Table 2 results of performance testing
| Marshall stability (60 ℃ C.)/KN | 1d storage stability/%) | 5d storage stability/%) | |
| Example 1 | 9.58 | 0.82 | 4.8 |
| Example 2 | 9.43 | 0.83 | 4.8 |
| Example 3 | 9.27 | 0.84 | 4.9 |
| Example 4 | 9.87 | 0.82 | 4.7 |
| Example 5 | 9.61 | 0.82 | 4.8 |
| Example 6 | 9.79 | 0.83 | 4.9 |
| Example 7 | 9.33 | 0.81 | 4.8 |
| Example 8 | 9.86 | 0.83 | 4.9 |
| Example 9 | 9.95 | 0.82 | 4.8 |
| Comparative example 1 | 8.17 | 1.1 | 6.4 |
| Comparative example 2 | 8.06 | 1.1 | 6.4 |
| Comparative example 3 | 8.45 | 1.0 | 6.2 |
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. The modified emulsified asphalt high-speed pavement mixture is characterized by comprising the following components in parts by weight: modified emulsified asphalt: 10-15 parts; mineral powder: 5-10 parts; coarse aggregate: 150-200 parts; fine aggregate: 15-30 parts;
the modified emulsified asphalt is obtained by carrying out composite modification on base asphalt through SBS and PPA and then emulsifying.
2. The modified emulsified asphalt high-speed pavement mixture as claimed in claim 1, wherein the modified emulsified asphalt is obtained by the following preparation steps:
a. heating the matrix asphalt to 170 ℃, adding an SBS modifier, uniformly stirring, putting into a 140 ℃ drying oven for swelling for 40min, then shearing at high speed for 1.5h under the conditions of 170-180 ℃ and 4000r/min, and finally keeping in a 140 ℃ drying oven for 40min to obtain SBS modified asphalt;
b. heating SBS modified asphalt to 158-165 deg.C, adding PPA, stirring for 20min, and maintaining temperature for 30-60min to obtain composite modified asphalt;
c. pouring stabilizer and emulsifier into 70 deg.C hot water, stirring, adjusting pH to 2-3 with hydrochloric acid, pouring the mixture into colloid mill, adding composite modified asphalt heated to 160 deg.C, and emulsifying for 2-5min to obtain modified emulsified asphalt.
3. The modified emulsified asphalt pavement compound according to claim 2, wherein the base asphalt is selected from one of petroleum asphalt, coal asphalt, and lake asphalt.
4. The modified emulsified asphalt high-speed pavement mixture according to claim 2, wherein the mineral powder gradation ranges are as follows:
mesh (mm)13.29.54.752.361.180.60.30.15
Transmittance (%) 10097.463.348.534.426.612.38.4.
5. The modified emulsified asphalt highway pavement compound according to claim 1 wherein said coarse aggregate is selected from the group consisting of basalt aggregate, diabase aggregate and limestone aggregate, and has a particle size of 4.75-9.25 mm.
6. The modified emulsified asphalt highway pavement compound according to claim 1 wherein said fine aggregate is selected from one of limestone aggregate, diabase aggregate and basalt aggregate, and has a particle size of 0-2.35 mm.
7. The modified emulsified asphalt highway pavement mixture according to claim 2 wherein in step c, corn stalk cellulose is also added to the colloid mill.
8. The preparation method of the modified emulsified asphalt high-speed pavement mixture according to any one of claims 1 to 7, comprising the following steps:
s1, adding the coarse aggregate, the fine aggregate and the mineral powder into a stirring tank, and uniformly stirring and mixing to obtain a mixture;
s2, placing the mixture in a drying barrel, and drying at 120-170 ℃ to constant weight;
and S3, pouring the dried mixture into a mixing device, adding the modified emulsified asphalt, and uniformly mixing at the rotating speed of 600-800r/min to obtain the modified emulsified asphalt.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112898791A (en) * | 2021-03-31 | 2021-06-04 | 长安大学 | Composite modified emulsified asphalt and preparation method thereof |
| CN113045249A (en) * | 2021-03-31 | 2021-06-29 | 长安大学 | Early-strength asphalt cold-patch material and preparation method thereof |
| CN113527898A (en) * | 2021-05-26 | 2021-10-22 | 江苏路易达工程科技有限公司 | Asphalt high-viscosity modifier capable of being rapidly dissolved and preparation method thereof |
| CN117142810A (en) * | 2023-09-12 | 2023-12-01 | 浙江威克赛新材料科技有限公司 | High-strength permeable asphalt concrete and preparation method thereof |
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2020
- 2020-07-10 CN CN202010663267.4A patent/CN111747686A/en active Pending
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112898791A (en) * | 2021-03-31 | 2021-06-04 | 长安大学 | Composite modified emulsified asphalt and preparation method thereof |
| CN113045249A (en) * | 2021-03-31 | 2021-06-29 | 长安大学 | Early-strength asphalt cold-patch material and preparation method thereof |
| CN112898791B (en) * | 2021-03-31 | 2022-08-12 | 长安大学 | Composite modified emulsified asphalt and preparation method thereof |
| CN113527898A (en) * | 2021-05-26 | 2021-10-22 | 江苏路易达工程科技有限公司 | Asphalt high-viscosity modifier capable of being rapidly dissolved and preparation method thereof |
| CN117142810A (en) * | 2023-09-12 | 2023-12-01 | 浙江威克赛新材料科技有限公司 | High-strength permeable asphalt concrete and preparation method thereof |
| CN117142810B (en) * | 2023-09-12 | 2024-05-17 | 浙江威克赛新材料科技有限公司 | High-strength permeable asphalt concrete and preparation method thereof |
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Application publication date: 20201009 |