CN112745062A - Composite fiber modified asphalt mixture with excellent performance and preparation method thereof - Google Patents
Composite fiber modified asphalt mixture with excellent performance and preparation method thereof Download PDFInfo
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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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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/46—Rock wool ; Ceramic or silicate fibres
- C04B14/4643—Silicates other than zircon
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- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/02—Cellulosic materials
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- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/065—Polyacrylates; Polymethacrylates
- C04B16/0658—Polyacrylonitrile
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- 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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- 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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Abstract
The invention discloses a composite fiber modified asphalt mixture with excellent performance and a preparation method thereof, wherein the modified asphalt mixture is prepared from the following raw materials in parts by weight: 4.5-6 parts of SBS modified asphalt, 8-12 parts of mineral powder, 90-100 parts of aggregate and 0.2-0.4 part of composite fiber stabilizer, wherein the composite fiber stabilizer consists of lignin fiber, polyacrylonitrile fiber and sepiolite fiber, the invention prepares the composite fiber stabilizer by three fibers with different performances according to a certain proportion, adds the composite fiber stabilizer into the aggregate and then mixes the composite fiber stabilizer with SBS modified asphalt and mineral powder to finally obtain a modified asphalt mixture, the composite fiber stabilizer is dispersed in the asphalt mixture, plays a role of good and bad complementation in the performance improvement of the modified asphalt mixture, has performances greatly superior to the performances of the modified asphalt mixture and the modified asphalt mixture using a single fiber stabilizer, and has great economic and social benefits in the aspects of reducing engineering cost, improving the use quality of pavements and the like.
Description
Technical Field
The invention belongs to the field of road engineering, and particularly relates to a composite fiber modified asphalt mixture with excellent performance and a preparation method thereof.
Background
The construction matters of the highway relate to national economic development and social harmony and stability, particularly in areas with dense population or underdeveloped economy, the highway plays a crucial role, and with the continuous increase of field vehicles, the bearing capacity and the operation and maintenance capacity of the highway become great problems; because the asphalt pavement has the advantages of smooth surface, no joint, small vibration, low noise, stable and comfortable driving, simple and convenient maintenance and the like, most urban roads built in recent years in China adopt the asphalt pavement. However, as urban population and various passenger vehicles have increased, the traffic pressure on urban roads has increased, and many new asphalt pavements have long-term use and have technical and quality problems, such as early breakage, transition, congestion, rutting, cracking, muddiness, rapid reduction in surface properties, and insufficient service life, which have been the focus of attention of road workers.
In order to improve the pavement performance of a road asphalt pavement to meet the use requirement of a road, a road worker adds an SBS modifier into asphalt to modify the asphalt, the high-temperature viscosity of the modified asphalt mixture is increased, the softening point is increased, the multi-aspect performance of the modified asphalt pavement is obviously improved under good design mixing proportion and construction conditions, but the conditions of poor aging resistance, high price and insufficient high and low temperature performance still exist in the actual road process, experts explore various technical approaches for further improving the comprehensive pavement performance of the modified asphalt mixture, wherein the method of doping a fiber stabilizer into the modified asphalt mixture is a successful method at home and abroad; the fiber reinforced modified asphalt pavement has received general attention by the characteristics of better high and low temperature performance and convenient construction technology by reducing the consumption of SBS, and the fiber reinforced modified asphalt pavement is commonly applied in the market at present: the wood fiber can adsorb and stabilize the asphalt to improve the thermal stability, the common fibers such as polyester, polyacrylonitrile and the like in the polymer organic fiber have obvious bridging reinforcement effect on the asphalt, the mineral fiber can improve the anti-cracking performance of the modified asphalt mixture, and the like, because the modified asphalt mixture has the heterogeneous structural characteristics of multiple phases, multiple components and multiple layers, the improvement effect of different types of fibers on the pavement performance of the modified asphalt mixture is different, in the prior art, a single fiber is added into the modified asphalt mixture as a stabilizer to improve the high-low temperature performance, the water stability and the fatigue resistance of the asphalt pavement, although each pavement fiber has advantages, the improvement effect of each fiber on the pavement performance of the asphalt mixture is single, the improvement effect of using a certain single road fiber as a stabilizer on the road performance of the asphalt mixture is limited, the prices of different fiber stabilizers are different, the price of a fiber stabilizer with better performance is expensive, and therefore, various types of fibers are combined in different modes to form the composite fiber, so that the road performance of the asphalt mixture in various aspects is improved, the service life of a road is prolonged, and the reduction of the construction cost is focused.
Disclosure of Invention
The invention aims to provide a composite fiber modified asphalt mixture with excellent performance and a preparation method thereof, and solves the technical problems that the road performance improved by adding a single fiber stabilizer in the modified asphalt mixture in the prior art is limited and the like.
In order to achieve the purpose, the invention adopts the technical scheme that:
the composite fiber modified asphalt mixture with excellent performance is composed of the following raw materials in parts by weight: 4.5-6 parts of SBS modified asphalt, 8-12 parts of mineral powder, 90-100 parts of aggregate and 0.2-0.4 part of composite fiber stabilizer, wherein the composite fiber stabilizer consists of lignin fiber, polyacrylonitrile fiber and sepiolite fiber.
Preferably, the weight parts of the lignin fiber, the polyacrylonitrile fiber and the sepiolite fiber are as follows: 32-38: 25-29:13-17.
Preferably, the length of the lignin fiber is 4-5.2mm, the length of the polyacrylonitrile fiber is 3-4.8mm, and the length of the sepiolite fiber is 5-6 mm.
Preferably, the aggregate comprises coarse aggregate and fine aggregate in a weight ratio of 1:0.4-0.6, wherein the particle size of the coarse aggregate ranges from 5mm to 15mm, and the particle size of the fine aggregate ranges from 0.15 mm to 5 mm.
Preferably, the coarse aggregate is basalt or diabase, and the fine aggregate is limestone.
Preferably, the mineral powder is limestone ground with the granularity of less than 0.075 mm.
The preparation method of the composite fiber modified asphalt mixture with excellent performance comprises the following steps:
1) preparing the raw materials according to the weight ratio of claim 1;
2) placing the weighed SBS modified asphalt in an oven, heating the SBS modified asphalt in the oven at 180 ℃ at 170 ℃ until the SBS modified asphalt is molten to obtain molten SBS modified asphalt, and keeping the temperature for later use;
3) respectively adding the weighed coarse aggregate, fine aggregate and mineral powder into an oven, heating for 5-6h at the temperature of 170-;
4) preheating a stirring device, adding preheated coarse aggregate, preheated fine aggregate and a composite fiber stabilizer into the preheated stirring device for stirring for 60-90s, adding the molten SBS modified asphalt for heat preservation in the step 1) into the stirring device, continuously stirring for 60-180s, adding preheated mineral powder, and stirring for 80-90s to prepare the asphalt mixture.
Preferably, the preparation method of the composite asphalt stabilizer comprises the following steps: weighing lignin fiber, polyacrylonitrile fiber and sepiolite fiber according to the weight part ratio, placing the lignin fiber, the polyacrylonitrile fiber and the sepiolite fiber into a reaction kettle, and mechanically stirring for 60-100min to obtain the composite fiber stabilizer.
Preferably, the preheating temperature of the stirring device in the step 4) is 170-180 ℃.
Compared with the prior art, the invention has the advantages that:
1. the composite fiber stabilizer is prepared by three fibers with different properties according to a certain proportion, the composite fiber stabilizer is added into aggregate and then is mixed with SBS modified asphalt and mineral powder to finally obtain modified asphalt mixture, and then the composite fiber stabilizer is dispersed in the asphalt mixture, so that the effect of good and bad complementation on the performance improvement of the modified asphalt mixture is achieved, the performance of the mixture is greatly superior to the performance of the modified asphalt mixture and the performance of the modified asphalt mixture using a single fiber stabilizer, and the composite fiber modified asphalt concrete has great economic and social benefits in the aspects of large-scale popularization and application on high-grade road surfaces, reduction of engineering cost, improvement of the use quality of road surfaces and the like;
2. the invention mixes the three fiber stabilizers to prepare the composite fiber stabilizer, which mutually plays a role in synergy and complementation: the lignin fiber has the advantages of good high-temperature stability and chemical stability, insolubility in common solvents, acid and alkali resistance, corrosion resistance and harmlessness to human bodies and environment, has strong physical adsorption effect, and can improve the durability of the asphalt mixture when added into the asphalt mixture; the polyacrylonitrile fiber is non-toxic, tasteless, pollution-free, non-radioactive, high in environmental protection, and has the characteristics of large initial modulus, high tensile strength, acid and alkali resistance, good corrosion resistance, good dispersibility, stable chemical performance and the like, and the impermeability and the anti-cracking performance of the asphalt pavement can be obviously improved after the modified asphalt mixture is added, so that low-temperature cracking and reflection cracks are prevented; the sepiolite fibers have higher specific surface area, porosity and extremely strong adsorbability, can adsorb a large amount of water or polar substances in fiber channels and holes, and can enhance the water stability of the asphalt mixture when added into the asphalt mixture;
3. the invention combines the multi-component fiber stabilizers with different interface structures and different physical and chemical properties, plays the roles of step-by-step stabilization and reinforcement on different structures and different performance levels of the asphalt concrete, fully exerts the interface structures and physical and chemical performance effects of various fibers, and mutually excites and supplements each other on different levels to achieve the effect of making up for deficiencies, thereby achieving the purposes of further improving the road performance of the asphalt concrete and reducing the construction cost.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but 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.
The mineral aggregate in the composite fiber modified asphalt mixture with excellent performance meets the related technical requirements of JTG-F40-2004 technical Specification for road asphalt pavement construction;
in the specific embodiment, the used coarse aggregate is basalt or diabase and has a particle size range of 5-15mm, and the fine aggregate is limestone and has a particle size range of 0.15-5 mm;
in the specific embodiment, the used mineral powder is limestone ground with the granularity of less than 0.075 mm;
in the specific embodiment, the length of the lignin fiber is 4-5.2mm, the length of the polyacrylonitrile fiber is 3-4.8mm, and the length of the sepiolite fiber is 5-6 mm;
example 1
The composite fiber modified asphalt mixture with excellent performance is composed of the following raw materials in parts by weight:
5 parts of SBS modified asphalt, 10 parts of mineral powder, 95 parts of aggregate and 0.3 part of composite fiber stabilizer;
the composite fiber stabilizer comprises lignin fibers, polyacrylonitrile fibers and sepiolite fibers in a weight ratio of 35:27: 15;
wherein the aggregate comprises coarse aggregate and fine aggregate in a weight ratio of 1: 0.5;
the preparation method of the composite fiber modified asphalt mixture with excellent performance comprises the following steps:
1) weighing the raw materials according to the weight part ratio, then placing the lignin fiber, the polyacrylonitrile fiber and the sepiolite fiber into a reaction kettle, and mechanically stirring for 80min to obtain the composite fiber stabilizer;
2) putting the weighed SBS modified asphalt into an oven, heating the oven at 175 ℃ until the SBS modified asphalt is molten to obtain molten SBS modified asphalt, and keeping the temperature for later use;
3) respectively adding the weighed coarse aggregate, fine aggregate and mineral powder into an oven, heating for 5-6h at 173 ℃, and drying to constant weight;
4) preheating a stirring device to 175 ℃, adding preheated coarse aggregate, preheated fine aggregate and the composite fiber stabilizer prepared in the step 1) into the preheated stirring device for stirring for 80s, adding the molten SBS modified asphalt for heat preservation in the step 2) into the stirring device, continuously stirring for 120s, adding preheated mineral powder, and stirring for 80-90s to prepare the asphalt mixture.
Example 2
The composite fiber modified asphalt mixture with excellent performance is composed of the following raw materials in parts by weight:
4.5 parts of SBS modified asphalt, 8 parts of mineral powder, 90 parts of aggregate and 0.2 part of composite fiber stabilizer;
the composite fiber stabilizer comprises lignin fibers, polyacrylonitrile fibers and sepiolite fibers in a weight ratio of 32:25: 13;
wherein the aggregate comprises coarse aggregate and fine aggregate in a weight ratio of 1: 0.4;
the preparation method of the composite fiber modified asphalt mixture with excellent performance comprises the following steps:
1) weighing the raw materials according to the weight part ratio, then placing the lignin fiber, the polyacrylonitrile fiber and the sepiolite fiber into a reaction kettle, and mechanically stirring for 60min to obtain a composite fiber stabilizer;
2) putting the weighed SBS modified asphalt into a drying oven, heating the SBS modified asphalt in the drying oven at 170 ℃ until the SBS modified asphalt is molten to obtain molten SBS modified asphalt, and keeping the temperature for later use;
3) respectively adding the weighed coarse aggregate, fine aggregate and mineral powder into an oven, heating for 5-6h at 170 ℃, and drying to constant weight;
4) preheating a stirring device to 170 ℃, adding preheated coarse aggregate, preheated fine aggregate and the composite fiber stabilizer prepared in the step 1) into the preheated stirring device for stirring for 60s, adding the molten SBS modified asphalt for heat preservation in the step 2) into the stirring device, continuously stirring for 60s, adding preheated mineral powder, and stirring for 80-90s to prepare the asphalt mixture.
Example 3
The composite fiber modified asphalt mixture with excellent performance is composed of the following raw materials in parts by weight:
6 parts of SBS modified asphalt, 12 parts of mineral powder, 100 parts of aggregate and 0.5 part of composite fiber stabilizer;
the composite fiber stabilizer comprises lignin fibers, polyacrylonitrile fibers and sepiolite fibers in a weight ratio of 38:29: 17;
wherein the aggregate comprises coarse aggregate and fine aggregate in a weight ratio of 1: 0.6;
the preparation method of the composite fiber modified asphalt mixture with excellent performance comprises the following steps:
1) weighing the raw materials according to the weight part ratio, then placing the lignin fiber, the polyacrylonitrile fiber and the sepiolite fiber into a reaction kettle, and mechanically stirring for 100min to obtain the composite fiber stabilizer;
2) putting the weighed SBS modified asphalt into an oven, heating the oven at 180 ℃ until the SBS modified asphalt is molten to obtain molten SBS modified asphalt, and keeping the temperature for later use;
3) respectively adding the weighed coarse aggregate, fine aggregate and mineral powder into an oven, heating for 5-6h at 175 ℃, and drying to constant weight;
4) preheating a stirring device to 180 ℃, adding preheated coarse aggregate, preheated fine aggregate and the composite fiber stabilizer prepared in the step 1) into the preheated stirring device for stirring for 90s, adding the molten SBS modified asphalt for heat preservation in the step 2) into the stirring device, continuously stirring for 180s, adding preheated mineral powder, and stirring for 80-90s to prepare the asphalt mixture.
Comparative example 1
Comparative example 1 differs from example 1 in that no composite fiber stabilizer is added. The remaining raw materials and procedures were the same as in example 1 to obtain comparative material 1.
Comparative example 2
Example 1 of comparative example 2 is different in that the same parts by weight of the lignocellulosic stabilizer is used instead of the composite fibrous stabilizer, and the composite fibrous stabilizer is not required to be prepared, and the remaining procedure is the same as in example 1, to obtain comparative material 2.
Comparative example 3
Example 1 of comparative example 3 is different in that the same weight part of polyacrylonitrile fiber is used instead of the composite fiber stabilizer, the composite fiber stabilizer is not required to be prepared, and the remaining procedure is the same as in example 1, resulting in comparative material 3.
Comparative example 4
Example 1 of comparative example 4 is different in that the composite fiber stabilizer is replaced with the sepiolite fiber in the same weight part without preparing the composite fiber stabilizer, and the remaining procedure is the same as in example 1, to obtain comparative material 4.
According to the relevant technical requirements of road engineering asphalt and asphalt mixture test procedures (JTG E20-2011), the composite fiber modified asphalt mixture with excellent performance prepared in the embodiments 1-3 of the invention and the asphalt mixture prepared in the comparative examples 1-4 are subjected to road performance tests, and the test items comprise water stability, high-temperature stability and low-temperature crack resistance;
1. water stability performance:
the water stability is used for representing the capability of asphalt of resisting water, high temperature and load coupling of the asphalt mixture to peel off and peel off from the aggregate surface, and the water stability of the mixture is verified by adopting a freeze-thaw cycle test and a water-soaking Marshall test:
the immersion Marshall experiment divides the test piece into two groupsOne group was tested for Marshall stability S after 0.5h in a 60 ℃ water bath1(ii) a The Marshall stability S of the other group was measured after 48h in a water bath at 60 deg.C2(ii) a According to S0＝S1/S2Calculating the residual stability by multiplying 100%;
freeze-thaw splitting test: (1) dividing the molded test pieces into two groups, storing the first group at normal temperature for later use, carrying out vacuum water saturation on the second group of test pieces for 15min, and placing the test pieces in water for 30min after the air pressure is recovered to be normal; (2) placing the test piece saturated with water into a plastic bag, injecting about 10mL of purified water into the plastic bag, and freezing the test piece in a low-temperature environment of-18 ℃ for 16 hours; taking out the test piece, and putting the test piece into a constant-temperature water tank at 60 ℃ for curing for 24 hours; (3) putting the two groups of test pieces into a constant temperature water tank at 25 ℃ and preserving heat for 2 h; then, carrying out a splitting test on the test piece to obtain the maximum load of the test, and processing data according to the following formula:
RT1＝0.006287×PT1/H1
RT2＝0.006287×PT2/H2
TSR＝RT1/RT2×100％
in the formula, RT1The splitting tensile strength of the test piece without freeze-thaw cycling, MPa;
RT2the split tensile strength of the test piece after freeze-thaw cycling, MPa;
PT1-load, N, when a test piece without freeze-thaw cycling is destroyed;
PT2-load, N, when the frozen magnetic cycled test piece is destroyed;
h-height of the test piece, mm;
TSR — melt fracture ratio.
The test results are shown in table 1 below:
TABLE 1 Water stability test results
| Experimental group | Residual stability% | The freeze-thaw splitting strength is more than% |
| Comparative example 1 | 91.2 | 89.3 |
| Comparative example 2 | 92.4 | 90.4 |
| Comparative example 3 | 92.2 | 93 |
| Comparative example 4 | 94.5 | 91.3 |
| Example 1 | 97.5 | 96.2 |
| Example 2 | 97 | 95.3 |
| Example 3 | 96.8 | 94.6 |
The test results show that the residual stability and the freeze-thaw splitting strength ratio of the asphalt mixture in examples 1 to 4 can reach more than 94%, and the asphalt mixture of the present invention is proved to have excellent water stability, and as can be seen from the above table, the addition of a single fiber stabilizer can improve the water stability of the asphalt mixture to a small extent, and the mixing of the lignin fiber, the polyacrylonitrile fiber and the sepiolite fiber in a certain proportion to prepare the composite fiber stabilizer can significantly improve the residual stability and the freeze-thaw splitting strength ratio of the asphalt mixture, and the huge specific surface area of the composite fiber can adsorb free asphalt, and a powerful infiltration interface is formed on the asphalt-aggregate surface, thereby improving the surface energy of asphalt and the interface strength between asphalt aggregate and asphalt aggregate, and improving the water stability.
2. High temperature stability
Testing and molding a rutting test block of the composite modified asphalt mixture by a wheel rolling method according to a method for testing T0719-2011 in a test procedure; placing the molded test piece which is not demoulded in a room temperature environment for stabilization for 48 h; then placing the test piece and the test mold at a constant temperature of 60 ℃ for heat preservation of not less than 5h, and starting a rut instrument to perform back-and-forth pressing for 1 h; read 45min (t)1) And 60min (t)2) Rut deformation d1And d2And calculating the dynamic stability according to a formula: dynamic stability (t)1-t2)×N/(d2-d1)×C1×C2Wherein: c1The reciprocating operation mode of the crank connecting rod driving loading wheel is shown, and 1.0 is selected; c2Representing the coefficient of the test piece, and taking 1.0; n represents the back-and-forth rolling speed of the test wheel, and 42 times/min are taken.
In the test, each group comprises 3 test pieces, the measured 3 test pieces are averaged, the dynamic stability index obtained by the high-temperature rutting test is adopted to evaluate the high-temperature stability of the embodiment and the comparative example, and the test results are shown in the following table 2:
TABLE 2 Rut test results
As can be seen from Table 2, the dynamic stability of the asphalt mixture is not less than 3500 times/mm and meets the specification, and the result shows that the high-temperature stability of the asphalt mixture can be improved to a small extent by adding a single fiber stabilizer, the dynamic stability of the asphalt mixture under the condition of adding a composite fiber stabilizer can reach 7000 times/mm and is obviously higher than the dynamic stability of the asphalt mixture under the condition of adding a single fiber stabilizer, which indicates that the dispersibility and uniformity of the composite fiber stabilizer in the asphalt mixture can reach the best, and the high-temperature anti-rutting performance of the modified asphalt mixture is greatly improved by playing an obvious bridging and reinforcing role on the asphalt mixture.
3. Low temperature crack resistance
The test adopts a low-temperature bending test to evaluate the low-temperature crack resistance of the asphalt mixing plant, the test temperature is-10 ℃, during the test, a rutting plate is manufactured according to the method of forming a test piece by the rutting test, the rutting plate is cut into a trabecular test piece with the size of 250 multiplied by 30 multiplied by 35mm, the test piece is placed in a low-temperature constant-temperature tank with the temperature of-10 ℃ for 45min before the test is started, then the test piece is placed on a universal testing machine, the low-temperature test is carried out at the loading rate of 50mm/min, and the test result is shown in table 3;
in the test research, the low-temperature performance of the asphalt mixture is evaluated by adopting a low-temperature trabecula bending test (-10 ℃), the breaking bending strain mu epsilon is used as a low-temperature evaluation index of SMA13, and the result is shown in the following table 3;
TABLE 3 Low temperature crack resistance test results
| Type (B) | Flexural stiffness modulus/MPa | Maximum bending tensile strain mu epsilon |
| Comparative example 1 | 2645.42 | 4279.38 |
| Comparative example 2 | 2569.99 | 4423.69 |
| Comparative example 3 | 2425.04 | 4603.02 |
| Comparative example 4 | 2678.25 | 4544.01 |
| Example 1 | 2506.41 | 4609.53 |
| Example 2 | 2447.77 | 4865.56 |
| Example 3 | 2475.36 | 4758.92 |
As can be seen from Table 3, the blending composite absorption stabilizer can significantly increase the bending strain of the modified asphalt, simultaneously reduce the bending stiffness modulus of the asphalt mixture, has better effect of improving the low-temperature performance than the blending single fiber stabilizer, improves the optimal asphalt dosage of the asphalt mixture by the oil absorption property of the lignin fiber in the composite fiber stabilizer, increases the film thickness of the asphalt mixture, and improves the flexibility of the mixture, which can positively affect the low-temperature performance of the asphalt mixture, and on the other hand, the blended hybrid fiber composed of the lignin, the polyacrylonitrile fiber and the sepiolite fiber overcomes the dislocation and movement among the aggregate particles under the load action, restrains the extension of cracks, hinders the development of cracks, and enhances the flexibility and toughness of the asphalt mixture by the force transfer, dissipation, adsorption stabilization, interface enhancement and hooping locking effects, further improving the low-temperature crack resistance of the hybrid fiber modified asphalt mixture.
The technical principles of the present invention have been described above in connection with specific embodiments, which are intended to explain the principles of the present invention and should not be construed as limiting the scope of the present invention in any way. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (9)
1. The composite fiber modified asphalt mixture with excellent performance is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: 4.5-6 parts of SBS modified asphalt, 8-12 parts of mineral powder, 90-100 parts of aggregate and 0.2-0.4 part of composite fiber stabilizer, wherein the composite fiber stabilizer consists of lignin fiber, polyacrylonitrile fiber and sepiolite fiber.
2. The composite fiber modified asphalt mixture with excellent performance as claimed in claim 1, wherein the composite fiber modified asphalt mixture comprises the following components in parts by weight: the weight parts of the lignin fiber, the polyacrylonitrile fiber and the sepiolite fiber are as follows: 32-38: 25-29:13-17.
3. The composite fiber modified asphalt mixture with excellent performance as claimed in claim 2, wherein:
the length of the lignin fiber is 4-5.2mm, the length of the polyacrylonitrile fiber is 3-4.8mm, and the length of the sepiolite fiber is 5-6 mm.
4. The composite fiber modified asphalt mixture with excellent performance as claimed in claim 1, wherein the composite fiber modified asphalt mixture comprises the following components in parts by weight: the aggregate comprises 1:0.4-0.6 of coarse aggregate and fine aggregate in parts by weight, wherein the particle size range of the coarse aggregate is 5-15mm, and the particle size range of the fine aggregate is 0.15-5 mm.
5. The composite fiber modified asphalt mixture with excellent performance according to claim 4, wherein the composite fiber modified asphalt mixture comprises the following components in parts by weight: the coarse aggregate is basalt or diabase, and the fine aggregate is limestone.
6. The composite fiber modified asphalt mixture with excellent performance as claimed in claim 1, wherein the composite fiber modified asphalt mixture comprises the following components in parts by weight: the mineral powder is limestone ground with the granularity of less than 0.075 mm.
7. The preparation method of the composite fiber modified asphalt mixture with excellent performance according to claim 1, which is characterized in that: the method comprises the following steps:
1) preparing the raw materials according to the weight ratio of claim 1;
2) placing the weighed SBS modified asphalt in an oven, heating the SBS modified asphalt in the oven at 180 ℃ at 170 ℃ until the SBS modified asphalt is molten to obtain molten SBS modified asphalt, and keeping the temperature for later use;
3) respectively adding the weighed coarse aggregate, fine aggregate and mineral powder into an oven, heating for 5-6h at the temperature of 170-;
4) preheating a stirring device, adding preheated coarse aggregate, preheated fine aggregate and a composite fiber stabilizer into the preheated stirring device for stirring for 60-90s, adding the molten SBS modified asphalt for heat preservation in the step 1) into the stirring device, continuously stirring for 60-180s, adding preheated mineral powder, and stirring for 80-90s to prepare the asphalt mixture.
8. The preparation method of the composite fiber modified asphalt mixture with excellent performance according to claim 7, is characterized in that: the preparation method of the composite asphalt stabilizer comprises the following steps: weighing lignin fiber, polyacrylonitrile fiber and sepiolite fiber according to the weight part ratio, placing the lignin fiber, the polyacrylonitrile fiber and the sepiolite fiber into a reaction kettle, and mechanically stirring for 60-100min to obtain the composite fiber stabilizer.
9. The preparation method of the composite fiber modified asphalt mixture with excellent performance according to claim 7, is characterized in that: the preheating temperature of the stirring device in the step 4) is 170-180 ℃.
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