CN111056771A - High-performance cement emulsified asphalt mixture and preparation method thereof - Google Patents
High-performance cement emulsified asphalt mixture and preparation method thereof Download PDFInfo
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- CN111056771A CN111056771A CN202010003169.8A CN202010003169A CN111056771A CN 111056771 A CN111056771 A CN 111056771A CN 202010003169 A CN202010003169 A CN 202010003169A CN 111056771 A CN111056771 A CN 111056771A
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- emulsified asphalt
- mixture
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- asphalt mixture
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0003—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability making use of electric or wave energy or particle radiation
- C04B40/0007—Electric, magnetic or electromagnetic fields
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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
Abstract
The invention belongs to the technical field of road engineering, and discloses a high-performance cement emulsified asphalt mixture and a preparation method thereof. The high-performance cement emulsified asphalt mixture comprises the following components: coarse aggregate, fine aggregate, emulsified asphalt, mineral filler, additive and water. The preparation method comprises the following steps: the method comprises the steps of fully mixing water for mixing, emulsified asphalt, mineral aggregate, filler and additives in a mixing device, uniformly stirring, carrying out magnetization treatment on the mixture according to a certain discharge rate through a magnetic field with set strength, and then paving and forming by a paving machine. The asphalt mixture prepared by the preparation method and the optimized material mixing proportion has excellent construction workability and road effect; compared with the traditional cold-mix asphalt mixture, the forming time of the strength is shorter, and the splitting strength and the fatigue life of the mixture are obviously improved.
Description
Technical Field
The invention belongs to the technical field of road engineering materials, and particularly relates to a high-performance cement emulsified asphalt mixture and a preparation method thereof.
Background
The cold-mix asphalt mixture (CRA) is a road material which is prepared by mixing mineral aggregate, modified emulsified asphalt and an inorganic cementing material in proportion and then mixing the mixture at normal temperature. The energy consumption is little in the production process, harmful gas is not discharged, the mechanical combination is simple in the construction process, the construction is rapid and convenient, the use requirement can be rapidly met after the construction is finished, and therefore the traffic influence is small. Therefore, the cold-mix asphalt mixture is widely applied to rapid treatment of road surfaces.
Emulsified asphalt and mineral aggregate in the cold-mix asphalt mixture are combined through physical and chemical actions, so that the compatibility problem of the two materials exists; the water loss and the cement hydration reaction in the process of forming the strength of the mixture both need longer time. The above problems limit the application of the cold mix asphalt mixture to the construction of structural layers (including surface layers and base layers). Therefore, the sensitivity of the compatibility among the components of the cold-mix asphalt mixture is reduced, the hydration reaction rate of the cement is improved, the strength forming time of the mixture can be effectively shortened, and the cold-mix asphalt mixture has a promoting effect on further wide application of the cold-mix asphalt mixture.
The organic derivative of silicon is used to treat mineral aggregate to raise the adhesion performance of mineral aggregate surface, and this is one improved cold mixing process for preparing asphalt mixture. The disadvantage of this method is that the viscosity-increasing agent used is highly toxic and requires energy expenditure for the overall heating of the mineral material. The cold-mixed asphalt mixture is magnetized, so that the adsorption capacity on the surface of the mineral material is enhanced, the adhesion state of an asphalt film and the mineral material is more stable, and the strength of the mixture is improved; meanwhile, the surface performance of water can be changed, so that the particle water can be more easily and fully reacted with the cement, and the strength forming time of the mixture is shortened; the cement-emulsified asphalt mucilage is uniformly coated on the surface of the mineral aggregate and fully develops in mineral aggregate gaps, so that internal stress concentration is avoided during the working period of the mixture, and the fatigue life of the mixture is prolonged. The invention provides a method for improving the use performance of a cold-mix asphalt mixture by magnetization treatment.
Disclosure of Invention
The invention aims to provide a high-performance cement emulsified asphalt mixture and a preparation method thereof, and the method can effectively improve the strength of the cement emulsified asphalt mixture, and simultaneously shorten the strength forming time, thereby improving the service performance of the cement emulsified asphalt mixture.
In order to achieve the purpose, the invention adopts the following technical scheme: the high-performance cement emulsified asphalt mixture is characterized by being prepared from the following raw materials in parts by weight:
35-75 parts of coarse aggregate;
25-65 parts of fine aggregate;
8-15 parts of emulsified asphalt;
1-7 parts of a filler;
1-6 parts of an additive;
2-12 parts of water;
the coarse aggregate and the fine aggregate are basalt, diabase, amphibole or limestone, wherein the particle size of the coarse aggregate is 3-15 mm, and the particle size of the fine aggregate is less than 3 mm;
the emulsified asphalt is common emulsified asphalt, SBR modified emulsified asphalt, SBS modified emulsified asphalt or rubber modified emulsified asphalt, the evaporation residue of the emulsified asphalt is more than or equal to 61%, and the asphalt is No. 70 or No. 90 road petroleum asphalt;
the filler is cement, quicklime, slaked lime or mineral powder;
the additive is an emulsifier, an anti-stripping agent, a regenerant or a warm mixing agent.
The preparation method of the high-performance cement emulsified asphalt mixture is characterized by comprising the following specific steps of:
(1) weighing coarse aggregate, fine aggregate and filler according to the weight ratio, adding the coarse aggregate, the fine aggregate and the filler into a horizontal stirrer, and stirring and mixing the coarse aggregate, the fine aggregate and the filler uniformly;
(2) respectively weighing water, emulsified asphalt and an additive according to the weight ratio, mixing the water with the emulsified asphalt, adding the mixture and the additive into a horizontal stirrer together, mixing the mixture with the mixture obtained in the step (1), and uniformly mixing the mixture at a low speed under a normal temperature condition;
(3) and (3) treating the mixture prepared in the step (2) through a magnetic field according to a designed discharging speed, and finally preparing the high-performance cement emulsified asphalt mixture.
Preferably, the field intensity of the magnetic field is 100-250 kA/m, and the discharging speed is 10-50 Kg/s.
The method is used for preparing the cement emulsified asphalt mixture based on the magnetization treatment mode, so that the construction workability of the mixture is improved, the water consumption for mixing the mixture is reduced, and the strength forming time for mixing the asphalt mixture at normal temperature is shortened.
The invention provides a high-performance cement emulsified asphalt mixture, which is magnetized by a magnetic field to achieve the purpose of improving the performance of the cement emulsified asphalt mixture. The magnetized cement emulsified asphalt mixture has the advantages that the surfaces of mineral aggregate and emulsion particles have higher activity and charge polarity, and all components can be combined more easily and the hydration reaction rate of a cementing material is accelerated, so that the cement-emulsified asphalt mortar is fully developed and is tightly combined with the surface of aggregate, and the mechanical strength of the mixture is improved. When the mixture is stirred, the water consumption for stirring is reduced, and the strength forming time of the mixture is shortened.
The test result of the invention shows that compared with the conventional cold-mix asphalt mixture, the high-performance cement emulsified asphalt mixture prepared based on the magnetized emulsion has the splitting strength respectively improved by more than 40% and 30% after being cured for 3d and 7d, and the strength forming time is shortened by more than 3 d; after 28 days of health preservation, the fatigue life can be improved by more than 2 times. The purposes of shortening the forming time of the cold-mixed asphalt mixture strength, improving the mixture strength and prolonging the fatigue life are achieved.
Drawings
FIG. 1 shows the results of the splitting test of the high-performance cement-emulsified asphalt mixture prepared in the examples;
FIG. 2 shows the fatigue test results of the high-performance cement-emulsified asphalt mixture obtained in the examples.
Detailed description of the preferred embodiments
The method for preparing a high-performance cement-emulsified asphalt mixture according to the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Unless otherwise specified, the contents of the respective components used below are in parts by weight.
In the invention, the special grading is tested by using AC-13C recommended by JTG F40-2004 technical Specification for construction of asphalt road surfaces for roads, as shown in Table 1:
TABLE 1 AC-13C grading
A high-performance cement emulsified asphalt mixture comprises the following raw materials in parts by weight:
63 parts of limestone coarse aggregate;
37 parts of limestone fine aggregate;
10 parts of modified emulsified asphalt;
3 parts of cement;
3 parts of an emulsifier;
and 2 parts of water.
Wherein the residual evaporation residue of the emulsified asphalt is 62 percent.
The preparation steps of the high-performance cement emulsified asphalt mixture are as follows:
firstly, weighing each component material with corresponding weight according to a designed formula, and uniformly mixing in a mixer;
and then the mixture passes through a kickoff pipe at 20Kg/s, the field intensity of a distributed magnetic field around the pipe is 100kA/m, and the mixture obtained by magnetization treatment is made into a standard test piece.
After the Marshall test piece is kept at 60 ℃ for 18 hours, the Marshall test piece is kept for 3d and 7d under the normal temperature and humidity condition, and the trabecular test piece is cured for 28d under the same condition, so that the physical and chemical process of forming the material structure is completed.
The materials and the curing conditions of the control group are the same as those of the control group, and the mixture is not subjected to magnetization treatment during molding.
Asphalt mixture splitting tests are carried out on the cured 3d and 7d test pieces, the results are shown in figure 1, and compared with the control group test pieces, the 3d and 7d splitting strengths of the high-performance cement emulsified asphalt mixture test pieces are respectively improved by 57% and 40%; compared with the 7d strength of the control group test piece, the strength forming time of the high-performance cement-emulsified asphalt mixture is shortened by 52 percent.
The fatigue test of the cured 28d trabecular test piece is carried out, the result is shown in figure 2, and the fatigue life of the high-performance cement-emulsified asphalt mixture test piece is 2 times of that of the control group test piece.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (3)
1. The high-performance cement emulsified asphalt mixture is characterized by being prepared from the following raw materials in parts by weight:
35-75 parts of coarse aggregate;
25-65 parts of fine aggregate;
8-15 parts of emulsified asphalt;
1-7 parts of a filler;
1-6 parts of an additive;
2-12 parts of water;
the coarse aggregate and the fine aggregate are basalt, diabase, amphibole or limestone, wherein the particle size of the coarse aggregate is 3-15 mm, and the particle size of the fine aggregate is less than 3 mm;
the emulsified asphalt is common emulsified asphalt, SBR modified emulsified asphalt, SBS modified emulsified asphalt or rubber modified emulsified asphalt, the evaporation residue of the emulsified asphalt is more than or equal to 61%, and the asphalt is No. 70 or No. 90 road petroleum asphalt;
the filler is cement, quicklime, slaked lime or mineral powder;
the additive is an emulsifier, an anti-stripping agent, a regenerant or a warm mixing agent.
2. The preparation method of the high-performance cement emulsified asphalt mixture according to claim 1, which is characterized by comprising the following specific steps:
(1) weighing coarse aggregate, fine aggregate and filler according to the weight ratio, adding the coarse aggregate, the fine aggregate and the filler into a horizontal stirrer, and stirring and mixing the coarse aggregate, the fine aggregate and the filler uniformly;
(2) respectively weighing water, emulsified asphalt and an additive according to the weight ratio, mixing the water with the emulsified asphalt, adding the mixture and the additive into a horizontal stirrer together, mixing the mixture with the mixture obtained in the step (1), and uniformly mixing the mixture at a low speed under a normal temperature condition;
(3) and (3) treating the mixture prepared in the step (2) through a magnetic field according to a designed discharging speed, and finally preparing the high-performance cement emulsified asphalt mixture.
3. The method for preparing the high-performance cement emulsified asphalt mixture according to claim 2, wherein: the field intensity of the magnetic field is 100-250 kA/m, and the discharging speed is 10-50 Kg/s.
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| CN202010003169.8A CN111056771A (en) | 2020-01-02 | 2020-01-02 | High-performance cement emulsified asphalt mixture and preparation method thereof |
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| CN202010003169.8A CN111056771A (en) | 2020-01-02 | 2020-01-02 | High-performance cement emulsified asphalt mixture and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112299755A (en) * | 2020-10-09 | 2021-02-02 | 句容市公路管理处 | Modified asphalt mixture for cement concrete bridge deck |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06329483A (en) * | 1993-05-20 | 1994-11-29 | Sumitomo Cement Co Ltd | Method for curing mortal and concrete in magnetic field |
| CN1129634A (en) * | 1995-10-17 | 1996-08-28 | 徐涤 | Method for increasing concrete strength by treating water in a strong magnetic field |
| CN101630569A (en) * | 2009-07-09 | 2010-01-20 | 济南四建（集团）有限责任公司 | Magnetization technology used for concrete admixtures |
| CN104034866A (en) * | 2014-06-30 | 2014-09-10 | 北京建筑大学 | Method for evaluating performance of cool-mixed and cool-spread modified emulsified asphalt mixture |
| CN108129073A (en) * | 2017-12-26 | 2018-06-08 | 华南理工大学 | A kind of cold mixing cold laid asphaltic mixture and cold mixing cold laid asphaltic mixture wearing course |
-
2020
- 2020-01-02 CN CN202010003169.8A patent/CN111056771A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06329483A (en) * | 1993-05-20 | 1994-11-29 | Sumitomo Cement Co Ltd | Method for curing mortal and concrete in magnetic field |
| CN1129634A (en) * | 1995-10-17 | 1996-08-28 | 徐涤 | Method for increasing concrete strength by treating water in a strong magnetic field |
| CN101630569A (en) * | 2009-07-09 | 2010-01-20 | 济南四建（集团）有限责任公司 | Magnetization technology used for concrete admixtures |
| CN104034866A (en) * | 2014-06-30 | 2014-09-10 | 北京建筑大学 | Method for evaluating performance of cool-mixed and cool-spread modified emulsified asphalt mixture |
| CN108129073A (en) * | 2017-12-26 | 2018-06-08 | 华南理工大学 | A kind of cold mixing cold laid asphaltic mixture and cold mixing cold laid asphaltic mixture wearing course |
Non-Patent Citations (2)
| Title |
|---|
| 刘悦等: "不同流速磁化水对水泥拌合物和易性的影响", 《黑龙江科学》 * |
| 张金升等: "《交通新材料》", 31 January 2014, 哈尔滨工业大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112299755A (en) * | 2020-10-09 | 2021-02-02 | 句容市公路管理处 | Modified asphalt mixture for cement concrete bridge deck |
| CN112299755B (en) * | 2020-10-09 | 2022-04-15 | 句容市公路管理处 | Modified asphalt mixture for cement concrete bridge deck |
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