CN113736271B - Compound double-modified asphalt mixture additive and preparation method thereof - Google Patents
Compound double-modified asphalt mixture additive and preparation method thereof Download PDFInfo
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- CN113736271B CN113736271B CN202111029003.4A CN202111029003A CN113736271B CN 113736271 B CN113736271 B CN 113736271B CN 202111029003 A CN202111029003 A CN 202111029003A CN 113736271 B CN113736271 B CN 113736271B
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- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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Abstract
The invention belongs to the technical field of engineering materials, and particularly relates to a compound double-modified asphalt mixture additive which is prepared from the following raw materials in percentage by weight: 60-80% of rock asphalt, 5-30% of natural polysaccharide, 5-10% of siliceous mineral powder, 3-8% of gelatin and 0.3-1.0% of mannitol. The invention also discloses a preparation method of the compound double-modified asphalt mixture additive. The compound double-modified asphalt mixture additive obtained by the invention can replace SBS modifier, is energy-saving and environment-friendly, and has more excellent high-temperature stability, water stability, plastic deformation resistance, low-temperature crack resistance and rutting resistance.
Description
Technical Field
The invention belongs to the technical field of engineering materials, and particularly relates to a compound double-modified asphalt mixture additive.
Background
The asphalt mixture is a composite material, mainly comprising asphalt, coarse aggregate, fine aggregate, mineral powder, and optionally polymer and wood cellulose; different structures are formed by mixing materials with different qualities and quantities and have different mechanical properties. The asphalt mixture is divided into continuous gradation mixture and discontinuous gradation mixture according to the material composition and structure; according to the mineral aggregate gradation composition and the size of the void ratio, the mineral aggregate is divided into dense gradation, semi-open gradation and open gradation mixed materials; the size of the nominal maximum particle size can be classified into extra coarse (nominal maximum particle size is larger than 37.5mm), coarse (nominal maximum particle size is 26.5mm or 31.5mm), medium (nominal maximum particle size is 16mm or 19mm), fine (nominal maximum particle size is 9.5mm or 13.2mm) and sand (nominal maximum particle size is smaller than 9.5mm) asphalt mixture. The asphalt is divided into hot-mix asphalt mixture, cold-mix asphalt mixture, recycled asphalt mixture and the like according to the manufacturing process. Because the prior asphalt mixture has high penetration and low softening point, the high-temperature stability and the track capacity of the asphalt pavement are low, in order to improve the performance of the asphalt mixture, the SBS modifier is usually added for modification in the prior art, but the SBS modifier is adopted for modification, so that the energy consumption is high, the environment is polluted, the modification process is complex, and in addition, due to the compatibility problem of a polymer and matrix asphalt, not all asphalt is suitable for polymer modification.
Therefore, it is necessary to research and develop an energy-saving and environment-friendly compound double-modified asphalt mixture additive for replacing SBS modifier.
Disclosure of Invention
The invention aims to solve the technical problems and provides a compound double-modified asphalt mixture additive which can replace an SBS modifier, is energy-saving and environment-friendly and has more excellent high-temperature stability, water stability, plastic deformation resistance, low-temperature crack resistance and rutting resistance.
The technical scheme of the invention is as follows:
a compound double-modified asphalt mixture additive is prepared from the following raw materials in percentage by weight: 60-80% of rock asphalt, 5-30% of natural polysaccharide, 5-10% of siliceous mineral powder, 3-8% of gelatin and 0.3-1.0% of mannitol.
Preferably, the compound double-modified asphalt mixture additive is prepared from the following raw materials in percentage by weight: 70-78.3% of rock asphalt, 5-16.5% of natural polysaccharide, 7-8% of siliceous mineral powder, 6-8% of gelatin and 0.5-0.7% of mannitol.
In order to enable the compound double-modified asphalt mixture additive to improve the high-temperature stability, the water stability, the plastic deformation resistance, the low-temperature crack resistance and the rutting resistance of the asphalt mixture, preferably, the natural polysaccharide is one of chitosan, chitin and alginic acid.
Preferably, the silicon ore powder is nano-scale and contains more than 97% of silicon dioxide.
The invention also provides a preparation method of the compound double-modified asphalt mixture additive, which comprises the following steps:
(1) carrying out superfine grinding on the rock asphalt to obtain rock asphalt micro powder;
(2) dissolving gelatin in water of 60-80 deg.C 80-100 times of the weight of gelatin, adding mannitol, and stirring to obtain mixed solution;
(3) treating the mixed solution by high-pressure microjet to obtain a second mixed solution;
(4) spraying the second mixed solution on the surface of the rock asphalt micro powder, stirring for 10-15min, adding natural polysaccharide and silica ore powder, performing superfine grinding at 40-55 ℃, and drying.
In order to obtain rock asphalt with more uniform particle size, the rock asphalt is subjected to superfine grinding, and preferably, in the step (1) of the invention, the superfine grinding time is 13-18 min.
In order to mix the gelatin and mannitol more uniformly to form a cross-linked elastic network structure, preferably, in step (3) of the present invention, the conditions of the high-pressure micro-jet are: the pressure is 55-75MPa, the temperature is 60-70 ℃, and the time is 22-30 min.
In order to obtain a suitable rock asphalt, preferably, in the step (4) of the invention, the rock asphalt is subjected to superfine grinding for 5-10min, the grinding time is too long, the particle size of the rock asphalt is too small, the mechanical property of the asphalt mixture is not favorably improved, the grinding time is too short, the particle size of the rock asphalt cannot meet the requirement of the invention, an elastic network structure formed by mixing and crosslinking gelatin and mannitol cannot well cover the particle size of the rock asphalt, and the effects of improving the high-temperature stability, the water stability, the plastic deformation resistance, the low-temperature crack resistance and the rutting resistance of the asphalt cannot be achieved.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, through compatibility of gelatin and mannitol, the viscosity of the rock asphalt is increased, and the natural polysaccharide and the silica ore powder are combined, so that the high-temperature stability and the low-temperature cracking resistance of the rock asphalt can be improved, the viscoelastic range of the rock asphalt is enlarged, the temperature sensitivity is reduced, and the aging resistance and the fatigue resistance of the rock asphalt are simultaneously enhanced.
2. The compound double-modified asphalt mixture additive prepared by the method can improve the softening point of the asphalt mixture, reduce the penetration degree of the asphalt and simultaneously improve the high-temperature stability, the water stability, the plastic deformation resistance, the low-temperature crack resistance and the rutting resistance of the asphalt.
3. According to the method, rock asphalt is subjected to superfine grinding, so that the particle size of the rock asphalt is more uniform, gelatin and mannitol are mixed and sprayed on the rock asphalt, the viscosity of rock asphalt particles is increased, the surface osmotic pressure of the rock asphalt is kept, agglomeration among the rock asphalt particles is prevented, natural polysaccharide and silica ore powder are added and mixed more uniformly, and when the prepared additive is added into an asphalt mixture to modify the asphalt mixture, the prepared compound double-modified asphalt mixture additive has high compatibility with the asphalt mixture, so that a chemical cross-linking elastic network structure is formed in the asphalt mixture, and the high-temperature stability, the water stability, the plastic deformation resistance, the low-temperature crack resistance and the anti-rutting performance of the asphalt are improved.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A compound double-modified asphalt mixture additive is prepared from the following raw materials in percentage by weight: 60% of rock asphalt, 30% of chitosan, 5% of silicon mineral powder, 4.7% of gelatin and 0.3% of mannitol, wherein the silicon mineral powder is nanoscale and contains 97% of silicon dioxide.
The preparation method of the compound double-modified asphalt mixture additive comprises the following steps:
(1) carrying out superfine grinding on the rock asphalt for 13min to obtain rock asphalt micro powder;
(2) dissolving gelatin in water of 80 ℃ with the weight of 100 times of that of the gelatin, adding mannitol after the gelatin is dissolved, and uniformly stirring to obtain a mixed solution;
(3) treating the mixed solution by high-pressure microjet, wherein the conditions of the high-pressure microjet are as follows: the pressure is 55MPa, the temperature is 70 ℃, and the time is 22min, so as to obtain a second mixed solution;
(4) spraying the second mixed solution on the surface of rock asphalt micro powder, stirring for 15min, adding natural polysaccharide and silica ore powder, performing superfine grinding at 40 deg.C for 10min, and drying to remove surface water.
TABLE 1 test results of AC-13 type asphalt mixture added with additive of example 1 of the present invention
Example 2
A compound double-modified asphalt mixture additive is prepared from the following raw materials in percentage by weight: 80% of rock asphalt, 6% of chitin, 10% of silicon mineral powder, 3% of gelatin and 1.0% of mannitol, wherein the silicon mineral powder is nanoscale and contains 97% of silicon dioxide.
The preparation method of the compound double-modified asphalt mixture additive comprises the following steps:
(1) carrying out superfine grinding on the rock asphalt for 14min to obtain rock asphalt micro powder;
(2) dissolving gelatin in water at 70 ℃ which is 80 times of the weight of the gelatin, adding mannitol after the gelatin is dissolved, and uniformly stirring to obtain a mixed solution;
(3) treating the mixed solution by high-pressure microjet, wherein the conditions of the high-pressure microjet are as follows: the pressure is 60MPa, the temperature is 66 ℃, and the time is 24min, so as to obtain a second mixed solution;
(4) spraying the second mixed solution on the surface of rock asphalt micro powder, stirring for 13min, adding natural polysaccharide and silica ore powder, performing ultramicro pulverization at 45 deg.C for 8min, and drying surface water.
Table 2 results of testing AC-13 asphalt mixture with additive of example 2 of the present invention
| Inspection item | The result of the detection | Standard of regulation | Test method |
| Rut test (60 ℃ C.) dynamic stability/(degree/mm) | 10412 | ≥2800 | T0719 |
| Residual stability ratio/%) | 90 | ≥85 | T0709 |
| Marshall stability/kN | 21 | ≥8.0 | T0729 |
| Ratio of residual Strength/percent in the Freeze-thaw cleavage test | 97 | ≥80 | T0729 |
| Low temperature bending limit strain (-10 deg.C)/mu epsilon | 2564 | ≥2500 | T0715 |
| Flow value/mm | 2.9 | 1.5-4 | T0709 |
| Bulk density of wool/(g/cm) 3 ) | 2.311 | / | T0705 |
Example 3
A compound double-modified asphalt mixture additive is prepared from the following raw materials in percentage by weight: 70% of rock asphalt, 16.5% of alginic acid, 7% of silicon ore powder, 6% of gelatin and 0.5% of mannitol, wherein the silicon ore powder is nanoscale and contains 97% of silicon dioxide.
The preparation method of the compound double-modified asphalt mixture additive comprises the following steps:
(1) carrying out superfine grinding on the rock asphalt for 16min to obtain rock asphalt micro powder;
(2) dissolving gelatin in water with the weight of 85 times of that of the gelatin and at the temperature of 65 ℃, adding mannitol after the gelatin is completely dissolved, and uniformly stirring to obtain a mixed solution;
(3) treating the mixed solution by high-pressure microjet, wherein the conditions of the high-pressure microjet are as follows: the pressure is 70MPa, the temperature is 62 ℃, and the time is 26min, so as to obtain a second mixed solution;
(4) spraying the second mixed solution on the surface of the rock asphalt micro powder, stirring for 13min, adding natural polysaccharide and silica ore powder, performing superfine grinding at 50 ℃ for 6min, and drying the surface water.
Table 3 test results of AC-13 asphalt mixture with additive of example 3 of the present invention
| Inspection item | The result of the detection | Standard of regulation | Test method |
| Rut test (60 ℃ C.) dynamic stability/(degree/mm) | 10789 | ≥2800 | T0719 |
| Residual stability ratio/%) | 92 | ≥85 | T0709 |
| Marshall stability/kN | 23 | ≥8.0 | T0729 |
| Ratio of residual Strength/percent in the Freeze-thaw cleavage test | 97 | ≥80 | T0729 |
| Low temperature bending limit strain (-10 deg.C)/mu epsilon | 2823 | ≥2500 | T0715 |
| Flow value/mm | 3.2 | 1.5-4 | T0709 |
| Bulk density of wool/(g/cm) 3 ) | 2.526 | / | T0705 |
Example 4
A compound double-modified asphalt mixture additive is prepared from the following raw materials in percentage by weight: 78.3% of rock asphalt, 5% of alginic acid, 8% of silicon ore powder, 8% of gelatin and 0.7% of mannitol, wherein the silicon ore powder is nano-scale and contains 97% of silicon dioxide.
The preparation method of the compound double-modified asphalt mixture additive comprises the following steps:
(1) carrying out superfine grinding on the rock asphalt for 18min to obtain rock asphalt micro powder;
(2) dissolving gelatin in water at 60 ℃ 90 times of the weight of the gelatin, adding mannitol after the gelatin is dissolved, and uniformly stirring to obtain a mixed solution;
(3) treating the mixed solution by high-pressure microjet, wherein the conditions of the high-pressure microjet are as follows: the pressure is 75MPa, the temperature is 60 ℃, and the time is 30min, so as to obtain a second mixed solution;
(4) spraying the second mixed solution on the surface of rock asphalt micro powder, stirring for 10min, adding natural polysaccharide and silica ore powder, micronizing at 55 deg.C for 5min, and drying surface water.
Table 4 test results of AC-13 asphalt mixture with additive of example 4 of the present invention
| Inspection item | The result of the detection | Standard of regulation | Test method |
| Rut test (60 ℃ C.) dynamic stability/(degree/mm) | 10415 | ≥2800 | T0719 |
| Residual stability ratio/%) | 89 | ≥85 | T0709 |
| Marshall stability/kN | 19 | ≥8.0 | T0729 |
| Ratio of residual Strength/percent in the Freeze-thaw cleavage test | 96 | ≥80 | T0729 |
| Low temperature bending limit strain (-10 ℃)/mu epsilon | 2624 | ≥2500 | T0715 |
| Flow value/mm | 3.3 | 1.5-4 | T0709 |
| Bulk density of wool/(g/cm) 3 ) | 2.569 | / | T0705 |
From the results in tables 1 to 4, the compounded double-modified asphalt mixture prepared by the invention has excellent high-temperature stability, water stability, plastic deformation resistance, low-temperature crack resistance and rutting resistance, and can replace SBS modifier.
Comparative example 1
The difference from example 3 is:
a compound double-modified asphalt mixture additive is prepared from the following raw materials in percentage by weight: 69% of rock asphalt, 16.5% of alginic acid, 7% of siliceous ore powder, 6% of gelatin and 1.5% of mannitol. The rest is the same as example 3.
TABLE 5 test results of AC-13 asphalt mixture with additive of comparative example 1 according to the present invention
Comparative example 2
The difference from example 3 is:
a compound double-modified asphalt mixture additive is prepared from the following raw materials in percentage by weight: 70.4% of rock asphalt, 16.5% of alginic acid, 7% of siliceous mineral powder, 6% of gelatin and 0.1% of mannitol. The rest is the same as example 3.
TABLE 6 test results of AC-13 asphalt mixture with additive of comparative example 2 of the present invention
| Inspection item | The result of the detection | Standard of regulation | Test method |
| Rut test (60 ℃ C.) dynamic stability/(degree/mm) | 3026 | ≥2800 | T0719 |
| Residual stability ratio/%) | 83 | ≥85 | T0709 |
| Marshall stability/kN | 7.6 | ≥8.0 | T0729 |
| Ratio of residual Strength/percent in the Freeze-thaw cleavage test | 81 | ≥80 | T0729 |
| Low temperature bending limit strain (-10 ℃)/mu epsilon | 2506 | ≥2500 | T0715 |
| Flow value/mm | 2.3 | 1.5-4 | T0709 |
| Bulk density of wool/(g/cm) 3 ) | 2.359 | / | T0705 |
Comparative example 3
The difference from example 3 is: gelatin was replaced by dextrin. The rest is the same as example 3.
TABLE 7 test results of AC-13 asphalt mixture with additive of comparative example 3 of the present invention
| Inspection item | The result of the detection | Standard of regulation | Test method |
| Rut test (60 ℃ C.) dynamic stability/(degree/mm) | 2995 | ≥2800 | T0719 |
| Residual stability ratio/%) | 81 | ≥85 | T0709 |
| Marshall stability/kN | 7.2 | ≥8.0 | T0729 |
| Ratio of residual Strength/percent in the Freeze-thaw cleavage test | 78 | ≥80 | T0729 |
| Low temperature bending limit strain (-10 deg.C)/mu epsilon | 2612 | ≥2500 | T0715 |
| Flow value/mm | 3.9 | 1.5-4 | T0709 |
| Bulk density of wool/(g/cm) 3 ) | 2.563 | / | T0705 |
From the data in tables 5 and 6, the addition amount of mannitol is too much and too little, the obtained additives are not beneficial to improving the comprehensive performance of the asphalt mixture, the addition amount of mannitol is too high, so that a cross-linked network structure formed by gelatin and mannitol is loose, after rock asphalt particles are covered, the compatibility of rock asphalt and the asphalt mixture is low, the obvious improvement of the anti-rutting performance of the asphalt mixture is not facilitated, and the residual strength ratio of a freeze-thaw splitting test is poor; the addition amount of mannitol is too low, the mixing performance of gelatin and mannitol is poor, the gelatin is easy to agglomerate when being sprayed to rock asphalt and is not beneficial to covering and wrapping rock asphalt particles, and when the obtained additive is added to an asphalt mixture, the residual stability ratio and Marshall stability of the asphalt mixture are poor, and the dynamic stability ratio of a rutting test (60 ℃) and the residual strength ratio of a freeze-thaw splitting test are not obvious. Therefore, in order to obtain an additive capable of better improving the performance of the asphalt mixture, the addition amount of the mannitol needs to be strictly controlled.
From the data in table 7, when gelatin is blended into dextrin with the performance similar to that of gelatin, when the prepared additive is added into an asphalt mixture, the improvement of the dynamic stability performance of the asphalt mixture in a rutting test (at 60 ℃) is not obvious, and the residual stability ratio, the marshall stability and the residual strength ratio in a freeze-thaw splitting test are poor, which indicates that the structure formed by crosslinking dextrin and mannitol is poor, and is not beneficial to improving the performance of the asphalt mixture, and further indicates that the synergistic effect of the mannitol and the gelatin for improving the performance of the additive is further illustrated.
The AC-13 asphalt mixtures in tables 1 to 7 were prepared by the same method except for the additive. The preparation method of the AC-13 type asphalt mixture comprises the following steps:
(1) respectively weighing the aggregates and the mineral powder according to the mineral aggregate grading, and placing the weighed aggregates and the mineral powder in a baking oven at 195 ℃ for heating for 4 hours to heat the aggregates and the mineral powder to 195 ℃;
(2) heating the asphalt to 160 ℃;
(3) heating an asphalt mixture mixing pot to 180 ℃;
(4) pouring the aggregate heated to 195 ℃ into a mixing pot for dry mixing for 30 s;
(5) adding the compound double-modification additive into a mixing pot and mixing with aggregate for 90s (the dosage of the compound double-modification additive is 1.5 percent of the mass of the asphalt mixture);
(6) quantitatively pouring the heated asphalt into a mixing pot according to the determined dosage and mixing for 90s again;
(7) pouring the heated mineral powder into a mixing pot to mix for 90 s;
(8) the compound double-modified asphalt mixture after the blending is at 185 ℃ of 170-.
The aggregate is basalt, the fine aggregate is machine-made sand and mineral powder, the asphalt is No. 70A asphalt, and the AC-13 type asphalt mixture gradation table is shown in table 8.
TABLE 8AC-13 asphalt mixture gradation table
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (2)
1. The compound double-modified asphalt mixture additive is characterized by being prepared from the following raw materials in percentage by weight: 60-80% of rock asphalt, 5-30% of natural polysaccharide, 5-10% of siliceous mineral powder, 3-8% of gelatin and 0.3-1.0% of mannitol;
the natural polysaccharide is one of chitosan, chitin and alginic acid;
the silicon mineral powder is nano-scale and contains more than 97 percent of silicon dioxide;
the preparation method of the compound double-modified asphalt mixture additive comprises the following steps:
(1) carrying out superfine grinding on the rock asphalt to obtain rock asphalt micro powder;
(2) dissolving gelatin in water of 60-80 deg.C 80-100 times of the weight of gelatin, adding mannitol, and stirring to obtain mixed solution;
(3) treating the mixed solution by high-pressure microjet to obtain a second mixed solution;
(4) spraying the second mixed solution on the surface of the rock asphalt micro powder, stirring for 10-15min, adding natural polysaccharide and silica ore powder, performing superfine grinding at 40-55 ℃, and drying;
in the step (1), the superfine grinding time is 13-18 min;
in the step (3), the conditions of the high-pressure micro-jet flow are as follows: the pressure is 55-75MPa, the temperature is 60-70 ℃, and the time is 22-30 min;
in the step (4), the superfine grinding is carried out for 5-10 min.
2. The compound double-modified asphalt mixture additive as defined in claim 1, which is prepared from the following raw materials in percentage by weight: 70-78.3% of rock asphalt, 5-16.5% of natural polysaccharide, 7-8% of siliceous mineral powder, 6-8% of gelatin and 0.5-0.7% of mannitol.
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB797681A (en) * | 1955-06-10 | 1958-07-09 | Lukon Inc | Finely divided dispersible asphaltic composition and method of making it |
| CA1335748C (en) * | 1986-09-25 | 1995-05-30 | Jeffrey Lawrence Finnan | Crosslinked gelatins |
| JP4781328B2 (en) * | 2007-08-21 | 2011-09-28 | 新田ゼラチン株式会社 | Jelly materials, production methods and uses thereof |
| WO2009122228A1 (en) * | 2008-03-31 | 2009-10-08 | La Perla Srl | Improved anti-icing composition/ improved anti-icing composition |
| RU2568128C2 (en) * | 2010-07-08 | 2015-11-10 | Вм. Ригли Дж. Компани | Chewing gum and its production method |
| US10040940B2 (en) * | 2015-09-28 | 2018-08-07 | University Of Louisiana At Lafayette | Bone glue modified asphalt |
| CN111849180A (en) * | 2020-07-10 | 2020-10-30 | 广西路冠科技投资发展有限责任公司 | Compound rock modified asphalt mixture additive |
| CN111847973B (en) * | 2020-07-10 | 2022-11-25 | 广西路冠科技投资发展有限责任公司 | Compound double-modified asphalt mixture additive |
| CN113308124B (en) * | 2021-06-09 | 2022-04-26 | 山东交通学院 | Bone glue modified asphalt and preparation method thereof |
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