CN111099855A - Emulsified asphalt mixture and preparation method thereof - Google Patents
Emulsified asphalt mixture and preparation method thereof Download PDFInfo
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- CN111099855A CN111099855A CN201911341563.6A CN201911341563A CN111099855A CN 111099855 A CN111099855 A CN 111099855A CN 201911341563 A CN201911341563 A CN 201911341563A CN 111099855 A CN111099855 A CN 111099855A
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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
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Road Paving Structures (AREA)
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Abstract
The invention relates to an emulsified asphalt mixture and a preparation method thereof. The emulsified asphalt mixture is characterized by comprising 30-50 parts by weight of asphalt, 10-20 parts by weight of water-based acrylic acid, 2-6 parts by weight of an emulsifier, 1-4 parts by weight of a stabilizer, 3-12 parts by weight of a pH regulator, 20-30 parts by weight of water, 50-90 parts by weight of a curing agent and 1100 parts by weight of 650-doped aggregates. The emulsified asphalt mixture has the characteristics of high demulsification speed, high forming strength, high temperature and good water stability.
Description
Technical Field
The invention relates to the field of asphalt pavement materials, in particular to an emulsified asphalt mixture and a preparation method thereof.
Background
In recent years, expressways in China are in the period of rapid development, asphalt pavements are used as one of expressway pavement materials and play a leading role in expressway engineering construction, and the utilization rate of the asphalt pavements currently accounts for more than 90% of the world expressway engineering. Most of the asphalt concrete pavements adopted for constructing highways in China nowadays often have the defects of peeling, cracking, pit and the like. Particularly, the damage of the road surface caused by geological disasters such as earthquakes and the like in western mountainous areas requires quick and convenient timely repair of the road surface. On one hand, in the production process of the hot-mixed asphalt, the asphalt is heated to 160-180 ℃ for a long time, so that the environment is seriously polluted. On the other hand, the hot-mix asphalt mixture often cannot meet the requirement of pavement repair due to reasons such as inconvenient transportation and the like. In the production of the emulsified asphalt, the asphalt is heated to 120-140 ℃, so that volatile substances are reduced. In addition, the construction of emulsified asphalt at normal temperature avoids the risk of burning and scalding of operators due to scorching asphalt and avoids the smoking and baking of asphalt steam to the operators.
However, the filling effect of the pit of the emulsified asphalt mixture is not ideal at present, and the application of the emulsified asphalt mixture is limited because the emulsified asphalt mixture products in the Chinese market are uneven and have unstable use performance, and the defects of low early strength, low forming speed, short service life and the like generally exist. Although scholars at home and abroad do a lot of work on the research of the emulsified asphalt mixture, the defects of low demulsification speed and low forming speed are still not completely overcome.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an emulsified asphalt mixture and a preparation method thereof, aiming at solving the problem of low construction efficiency caused by low demulsification speed and low forming speed in road construction.
In order to solve the technical problems, the technical scheme of the invention is as follows:
an emulsified asphalt mixture is characterized by comprising 30-50 parts by weight of asphalt, 10-20 parts by weight of water-based acrylic acid, 2-6 parts by weight of an emulsifier, 1-4 parts by weight of a stabilizer, 3-12 parts by weight of a pH regulator, 20-30 parts by weight of water, 50-90 parts by weight of a curing agent and 1100 parts by weight of 650-plus-material aggregate.
Preferably, the emulsified asphalt mixture is characterized by comprising 30-40 parts by weight of asphalt, 10-14 parts by weight of water-based acrylic acid, 2-4 parts by weight of an emulsifier, 1-3 parts by weight of a stabilizer, 4-8 parts by weight of a pH regulator, 22-26 parts by weight of water, 56-86 parts by weight of a curing agent and 1100 parts by weight of 950-doped aggregate.
Preferably, the asphalt is No. 70 base asphalt.
Preferably, the aqueous acrylic acid is at least one of pure acrylic emulsion, styrene-acrylic emulsion, vinyl acetate-acrylic emulsion, silicone-acrylic emulsion, tertiary vinyl acetate emulsion and tertiary acrylic emulsion. Further, the aqueous acrylic acid is a tertiary propyl emulsion.
Preferably, the emulsifier is a medium-split cationic asphalt emulsifier; the pH regulator is hydrochloric acid.
Preferably, the stabilizer is at least one of polyvinyl alcohol, calcium chloride and methyl cellulose.
Further, the stabilizer is methylcellulose.
Preferably, the curing agent comprises, by weight, 22-30 parts of red mud, 32-42 parts of illite, 4-8 parts of calcium oxide, 6-12 parts of an aluminate coupling agent and 1-5 parts of aluminate cement.
Further, the red mud comprises red mud produced by a Bayer process, a sintering process, a sub-molten salt process or a combination process.
Preferably, the aggregate is at least one of limestone, amphibole, gabbro, diabase and basalt.
The preparation method of the emulsified asphalt mixture comprises the following steps:
s1, weighing, mixing and heating the asphalt to 150 ℃ at 100-;
s2, mixing and heating the emulsifier, the water-based acrylic acid, the stabilizer and the water to 50-70 ℃, stirring at the speed of 100-200 rpm, and adjusting the pH value by using a pH regulator to obtain a soap solution B for later use;
s3, slowly adding the mixture A in the S1 into the S2 soap liquid B, and carrying out high-speed shearing emulsification at the speed of 1100-1900 rpm for 5-12 min to obtain emulsified asphalt;
s4, mixing the aggregate and the curing agent, and stirring at the speed of 600-800 rpm for 4-8 min to obtain a mixture C;
and S5, mixing the emulsified asphalt with the mixture C, and stirring at the speed of 500-600 rpm for 2-5 min to obtain an emulsified asphalt mixture.
Preferably, the weight ratio of the emulsified asphalt to the mixture C is 4-10: 100, preferably 6-8: 100.
Bitumen and water are two different substances, both of which have a large surface tension and are generally not mixed together to form a homogeneous mixture. The emulsifier is dissolved in water, and can remarkably reduce the surface tension of water, so that fine and uniform asphalt particles and water can form a homogeneous mixture. The stabilizer mainly improves the viscosity of the water phase, forms an interfacial film on the particles, ensures that the interfacial film is not easy to coalesce when the particles collide, reduces the settling velocity of the asphalt particles, and improves the storage stability of the asphalt emulsion by matching with the emulsifier. The pH regulator can increase the activity of the emulsifier and improve the emulsifying capacity by regulating the proper pH value of the soap solution, thereby improving the emulsifying effect. The curing agent has large water absorption capacity and can generate hydration reaction with part of water in the emulsified asphalt so as to accelerate the demulsification speed of the emulsified asphalt. Hydration products such as Ca (OH) 2 and the like are generated in the curing agent along with the hydration of cement and calcium oxide, and CaCO3 and Ca (OH) 2 in the mixture react with hydrochloric acid in the emulsified asphalt, so that the emulsified asphalt mixture has higher strength; meanwhile, the red mud and illite contain higher CaO and SiO2, part of the red mud and illite are combined into dicalcium silicate (C2S), the red mud and illite contain a considerable amount of amorphous aluminosilicate substances, and Al2O3 and SiO2 in the red mud and illite rapidly react with calcium hydroxide generated by hydration of cement and calcium oxide to generate secondary hydration reaction, so that the gelling property is generated, a better promoting effect is achieved, and the strength, the high-temperature performance, the low-temperature performance, the water stability and other performances of the emulsified asphalt mixture are further improved. The coupling agent can be effectively combined with the mixture gel phase, the silane coupling agent is uniformly distributed in the emulsified asphalt mixture gel phase to form an interpenetrating network structure with the mixture, and the bridging and chemical bonding effects among the silane coupling agent, the emulsified asphalt, the curing agent and the aggregate effectively prevent the generation and development of microcracks, so that the mixture has better toughness, the binding force of the mixture is enhanced, and the strength is promoted to be formed. The water-based acrylic acid contains some hydrophilic functional groups, and when the water-based acrylic acid is doped into the mixture, the water-based acrylic acid and the hydrophilic functional groups on the curing agent are mutually combined to play a role in crosslinking, so that the functions of toughening and reinforcing can be played.
Compared with the prior art, the invention has the following beneficial effects:
1. the demulsification speed is high, the forming is fast, and the forming strength is high, so that the construction efficiency is greatly improved;
2. the pavement can be repaired at normal temperature without the treatment of mixing stations, heating, heat preservation and the like.
Detailed Description
The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Example 1
In this embodiment, the technical scheme of the emulsified asphalt mixture is as follows:
38 parts of No. 70 asphalt, 14 parts of tertiary propyl emulsion, 4 parts of medium-cracked cationic asphalt emulsifier, 2 parts of methyl cellulose, 8 parts of hydrochloric acid, 25 parts of water, 79 parts of curing agent and 1100 parts of basalt aggregate by weight.
The curing agent comprises 30 parts of red mud generated by a sintering method, 32 parts of illite, 6 parts of calcium oxide, 8 parts of aluminate coupling agent and 3 parts of aluminate cement.
The preparation method of the emulsified asphalt mixture comprises the following steps:
s1, weighing, mixing and heating the asphalt to 120 ℃, and stirring for 6min at the speed of 700rpm to obtain a mixture A for later use;
s2, mixing and heating the medium-split cationic asphalt emulsifier, the tertiary propyl emulsion, the methyl cellulose and the water to 65 ℃, stirring at the speed of 180rpm, and adjusting the pH value to 3 by using hydrochloric acid to obtain a soap solution B for later use;
s3, slowly adding the mixture A in the S1 into the S2 soap solution B, and carrying out high-speed shearing emulsification at a speed of 1600rpm for 8min to obtain emulsified asphalt;
s4, mixing the aggregate and the curing agent, and stirring at the speed of 750rpm for 6min to obtain a mixture C;
s5, mixing the emulsified asphalt with the mixture C according to the weight ratio of 6: 100 and stirring at 580rpm for 4min to obtain the emulsified asphalt mixture.
Example 2
In this embodiment, the technical scheme of the emulsified asphalt mixture is as follows:
38 parts of No. 70 asphalt, 12 parts of tertiary propyl emulsion, 4 parts of medium-cracked cationic asphalt emulsifier, 3 parts of methyl cellulose, 8 parts of hydrochloric acid, 25 parts of water, 79 parts of curing agent and 1100 parts of basalt aggregate by weight.
The curing agent comprises 28 parts of red mud generated by a sintering method, 34 parts of illite, 6 parts of calcium oxide, 7 parts of aluminate coupling agent and 4 parts of aluminate cement.
The preparation method of the emulsified asphalt mixture comprises the following steps:
s1, weighing, mixing and heating the asphalt to 120 ℃, and stirring for 6min at the speed of 700rpm to obtain a mixture A for later use;
s2, mixing and heating the medium-split cationic asphalt emulsifier, the tertiary propyl emulsion, the methyl cellulose and the water to 65 ℃, stirring at the speed of 180rpm, and adjusting the pH value to 3 by using hydrochloric acid to obtain a soap solution B for later use;
s3, slowly adding the mixture A in the S1 into the S2 soap solution B, and carrying out high-speed shearing emulsification at a speed of 1600rpm for 8min to obtain emulsified asphalt;
s4, mixing the aggregate and the curing agent, and stirring at the speed of 750rpm for 6min to obtain a mixture C;
s5, mixing the emulsified asphalt with the mixture C according to the weight ratio of 6: 100 and stirring at 580rpm for 4min to obtain the emulsified asphalt mixture.
Comparative example 1
In the comparative example, the technical scheme of the emulsified asphalt mixture is as follows:
38 parts of No. 70 asphalt, 14 parts of tertiary propyl emulsion, 4 parts of medium-cracked cationic asphalt emulsifier, 2 parts of methyl cellulose, 8 parts of hydrochloric acid, 25 parts of water, 79 parts of curing agent and 1100 parts of basalt aggregate by weight.
The curing agent comprises 79 parts of aluminate cement.
The preparation method of the emulsified asphalt mixture comprises the following steps:
s1, weighing, mixing and heating the asphalt to 120 ℃, and stirring for 6min at the speed of 700rpm to obtain a mixture A for later use;
s2, mixing and heating the medium-split cationic asphalt emulsifier, the tertiary propyl emulsion, the methyl cellulose and the water to 65 ℃, stirring at the speed of 180rpm, and adjusting the pH value to 3 by using hydrochloric acid to obtain a soap solution B for later use;
s3, slowly adding the mixture A in the S1 into the S2 soap solution B, and carrying out high-speed shearing emulsification at a speed of 1600rpm for 8min to obtain emulsified asphalt;
s4, mixing the aggregate and the curing agent, and stirring at the speed of 750rpm for 6min to obtain a mixture C;
s5, mixing the emulsified asphalt with the mixture C according to the weight ratio of 6: 100 and stirring at 580rpm for 4min to obtain the emulsified asphalt mixture.
The emulsified asphalt mixtures obtained in examples 1 and 2 and comparative example 1 and the commercial ordinary emulsified asphalt mixture were subjected to performance tests, and the results are shown in table 1, respectively.
TABLE 1 test results
| Kinds of asphalt mixture | Speed of emulsion breaking | Marshall stability (KN) | Degree of dynamic stability (times/mm) | Freeze-thaw split strength ratio (%) |
| Common emulsified asphalt mixture | 146min | 3 | 1786 | 70.8 |
| Example 1 | 41min | 18 | 3468 | 79.8 |
| Example 2 | 43min | 17 | 3374 | 77.1 |
| Comparative example 1 | 86 min | 5 | 2238 | 68.5 |
The results show that the emulsified asphalt mixture in the examples 1 and 2 has the advantages of high demulsification speed, high forming speed and high strength compared with the common emulsified asphalt mixture. The freeze-thaw splitting strength ratio reflects the water stability of the asphalt mixture, the dynamic stability reflects the high-temperature performance of the asphalt mixture, i.e., the anti-rutting capability, and the results show that the strength, the high-temperature performance and the water stability of the emulsified asphalt mixtures obtained in examples 1 and 2 are further improved. The curing agent in comparative example 1 is replaced by cement, which is enhanced compared with the common emulsified asphalt mixture, but the water stability is not improved.
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.
Claims (10)
1. An emulsified asphalt mixture is characterized by comprising 30-50 parts by weight of asphalt, 10-20 parts by weight of water-based acrylic acid, 2-6 parts by weight of an emulsifier, 1-4 parts by weight of a stabilizer, 3-12 parts by weight of a pH regulator, 20-30 parts by weight of water, 50-90 parts by weight of a curing agent and 1100 parts by weight of 650-plus-material aggregate.
2. The emulsified asphalt mixture as defined in claim 1, wherein said asphalt is No. 70 base asphalt.
3. The emulsified asphalt mixture as set forth in claim 1, wherein said aqueous acrylic acid is at least one of a pure acrylic emulsion, a styrene-acrylic emulsion, an acrylic-vinyl emulsion, a silicone-acrylic emulsion, a tertiary vinyl emulsion, and a tertiary acrylic emulsion.
4. The emulsified asphalt mixture as defined in claim 1, wherein said emulsifier is a medium-split cationic asphalt emulsifier; the pH regulator is hydrochloric acid.
5. The emulsified asphalt mixture as defined in claim 1, wherein said stabilizer is at least one of polyvinyl alcohol, calcium chloride, and methyl cellulose.
6. The emulsified asphalt mixture according to claim 1, wherein the curing agent comprises, by weight, 22-30 parts of red mud, 32-42 parts of illite, 4-8 parts of calcium oxide, 6-12 parts of an aluminate coupling agent, and 1-5 parts of aluminate cement.
7. The curing agent according to claim 6, wherein the red mud comprises a Bayer process, a sintering process, a sub-molten salt process, or a combination process produced red mud.
8. The emulsified asphalt mixture as set forth in claim 1, wherein said aggregate is at least one of limestone, amphibole, gabby, diabase, and basalt.
9. The process for the preparation of an emulsified asphalt mixture according to any one of claims 1 to 8, comprising the steps of:
s1, weighing, mixing and heating the asphalt to 150 ℃ at 100-;
s2, mixing and heating the emulsifier, the water-based acrylic acid, the stabilizer and the water to 50-70 ℃, stirring at the speed of 100-200 rpm, and adjusting the pH value by using a pH regulator to obtain a soap solution B for later use;
s3, slowly adding the mixture A in the S1 into the S2 soap liquid B, and carrying out high-speed shearing emulsification at the speed of 1100-1900 rpm for 5-12 min to obtain emulsified asphalt;
s4, mixing the aggregate and the curing agent, and stirring at the speed of 600-800 rpm for 4-8 min to obtain a mixture C;
and S5, mixing the emulsified asphalt with the mixture C, and stirring at the speed of 500-600 rpm for 2-5 min to obtain an emulsified asphalt mixture.
10. The method for preparing an emulsified asphalt mixture according to claim 9, wherein the weight ratio of the emulsified asphalt to the mixture C is 4-10: 100.
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Cited By (4)
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| CN111471399A (en) * | 2020-06-11 | 2020-07-31 | 陕西中融交通建设有限公司 | Ultrathin vaporific surface sealing layer material and preparation method and application thereof |
| CN112624708A (en) * | 2020-09-04 | 2021-04-09 | 广州至城建筑材料科技有限公司 | Asphalt concrete and preparation method thereof |
| TWI778609B (en) * | 2021-05-04 | 2022-09-21 | 國立高雄科技大學 | Preparation of compositions with high stability emulsified asphalt |
| CN116162409A (en) * | 2022-12-27 | 2023-05-26 | 徐州卧牛山新型防水材料有限公司 | Multi-component water-based asphalt base layer treating agent capable of being constructed at low temperature and construction method |
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Cited By (5)
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| CN116162409A (en) * | 2022-12-27 | 2023-05-26 | 徐州卧牛山新型防水材料有限公司 | Multi-component water-based asphalt base layer treating agent capable of being constructed at low temperature and construction method |
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