CN116477877A - Fiber-reinforced high-toughness asphalt mixture and preparation method thereof - Google Patents
Fiber-reinforced high-toughness asphalt mixture and preparation method thereof Download PDFInfo
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- CN116477877A CN116477877A CN202310521751.7A CN202310521751A CN116477877A CN 116477877 A CN116477877 A CN 116477877A CN 202310521751 A CN202310521751 A CN 202310521751A CN 116477877 A CN116477877 A CN 116477877A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 158
- 239000000203 mixture Substances 0.000 title claims abstract description 100
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 86
- 239000011707 mineral Substances 0.000 claims abstract description 86
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 54
- 239000000835 fiber Substances 0.000 claims abstract description 42
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 7
- 235000019738 Limestone Nutrition 0.000 claims description 6
- 239000006028 limestone Substances 0.000 claims description 6
- 238000010008 shearing Methods 0.000 abstract description 8
- 230000001965 increasing effect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 229920000715 Mucilage Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to the technical field of asphalt mixtures, in particular to a fiber-reinforced high-toughness asphalt mixture and a preparation method thereof. The fiber reinforced high-toughness asphalt mixture comprises the following raw materials in percentage by mass: 7.5 to 8.5 percent of high-viscosity high-elasticity modified asphalt, 0.2 to 0.4 percent of basalt fiber and 91.1 to 92.3 percent of mineral aggregate; the mineral aggregate comprises 65-75% of coarse aggregate and 25-35% of fine aggregate according to mass percentage. The fiber reinforced high-toughness asphalt mixture has the advantages that the thickness of an asphalt oil film is increased, the durability, the crack resistance, the tensile resistance, the shearing resistance and the rutting resistance are improved, and the technical problems that the durability of the traditional high-toughness asphalt mixture is poor and the service performance cannot meet the requirements are solved.
Description
Technical Field
The invention relates to the technical field of asphalt mixtures, in particular to a fiber-reinforced high-toughness asphalt mixture and a preparation method thereof.
Background
Asphalt pavement is widely used due to excellent running service quality, but various pavement diseases are inevitably generated under complex service conditions. For example, ruts tend to occur under high temperature, heavy load conditions; cracks are easy to occur under the condition of low temperature and heavy load; fatigue cracks such as net cracks are easy to appear under repeated wheel load; peeling, water damage such as pits and grooves and the like are easy to occur in a wet, hot and rainy environment. The pavement damage seriously affects the service quality of the asphalt pavement and reduces the service life of the pavement. The high-toughness asphalt mixture is an asphalt mixture with high toughness quality realized by adding high-viscosity high-elasticity modified asphalt with higher content, and the prior high-toughness asphalt mixture has the advantages of easy irreversible attenuation of different degrees and poor durability under special heavy load, high temperature and low temperature environments. Therefore, the search for asphalt mixtures with more excellent service properties has become a research hotspot.
Disclosure of Invention
Aiming at the problems of the background technology, the invention aims to provide a fiber reinforced high-toughness asphalt mixture, which has the advantages of improved asphalt film thickness, improved durability, crack resistance, tensile resistance, shearing resistance and rutting resistance, and solves the technical problems that the existing high-toughness asphalt mixture has poor durability and cannot meet the requirements on service performance.
The invention further aims to provide a preparation method of the fiber reinforced high-toughness asphalt mixture, which can be used for preparing the fiber reinforced high-toughness asphalt mixture with improved asphalt oil film thickness, durability, crack resistance, tensile resistance, shearing resistance and rutting resistance.
To achieve the purpose, the invention adopts the following technical scheme:
the fiber reinforced high-toughness asphalt mixture comprises the following raw materials in percentage by mass: 7.5 to 8.5 percent of high-viscosity high-elasticity modified asphalt, 0.2 to 0.4 percent of basalt fiber and 91.1 to 92.3 percent of mineral aggregate;
the mineral aggregate comprises 65-75% of coarse aggregate and 25-35% of fine aggregate according to mass percentage.
Further, the dynamic viscosity of the high-viscosity high-elasticity modified asphalt at 60 ℃ is greater than 400000 Pa.s, the composite shear modulus G at 60 ℃ is greater than 10kPa, and the elastic recovery rate at 25 ℃ is greater than 95%.
Further, the basalt fiber has a diameter of 14 μm to 16 μm and a length of 5.5mm to 6.5mm.
Further stated, the basalt fiber has a tensile strength of greater than 2500MPa, an elastic modulus of greater than 85GPa, and an elongation at break of greater than 3%.
Further, the mineral aggregate further comprises mineral powder, wherein coarse aggregate with the particle size of 5-10 mm accounts for 45-55% of the total mass of the mineral aggregate, coarse aggregate with the particle size of 3-5 mm accounts for 15-25% of the total mass of the mineral aggregate, fine aggregate with the particle size of less than 3mm accounts for 25-35% of the total mass of the mineral aggregate, and mineral powder accounts for 0-4% of the total mass of the mineral aggregate.
Further, the coarse aggregate and the fine aggregate are diabase or basalt respectively, and the mineral powder is limestone.
Further, the overall grading range of the mineral aggregate is as follows:
| screen hole (mm) | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Yield (%) | 100 | 95-100 | 45-55 | 23-30 | 15-20 | 10-15 | 5-10 | 4-8 | 3-6 |
。
The preparation method of the fiber reinforced high-toughness asphalt mixture is used for preparing the fiber reinforced high-toughness asphalt mixture and comprises the following steps of:
step (1), heating high-viscosity high-elasticity modified asphalt, basalt fiber and mineral aggregate for standby;
and (2) mixing the coarse aggregate and the fine aggregate, adding basalt fiber, mixing, adding high-viscosity high-elasticity modified asphalt, mixing, and finally adding mineral powder, mixing to obtain the fiber-reinforced high-toughness asphalt mixture.
Further more, in the step (1), the high-viscosity high-elasticity modified asphalt is heated to 185 ℃ for standby, and the basalt fiber and the mineral aggregate are heated to 195 ℃ for standby.
Further, in the step (2), coarse aggregate and fine aggregate are mixed for 10 s-15 s at 195 ℃, basalt fiber is added for mixing for 25 s-30 s, high-viscosity high-elasticity modified asphalt is added for mixing for 80 s-85 s, and mineral powder is added for mixing for 120 s-125 s, so that the fiber-reinforced high-toughness asphalt mixture is prepared.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
the fiber reinforced high-toughness asphalt mixture has the advantages that the thickness of an asphalt oil film is increased, the durability, the crack resistance, the tensile resistance, the shearing resistance and the rutting resistance are improved, and the technical problems that the durability of the traditional high-toughness asphalt mixture is poor and the service performance cannot meet the requirements are solved.
Detailed Description
The fiber reinforced high-toughness asphalt mixture comprises the following raw materials in percentage by mass: 7.5 to 8.5 percent of high-viscosity high-elasticity modified asphalt, 0.2 to 0.4 percent of basalt fiber and 91.1 to 92.3 percent of mineral aggregate;
the mineral aggregate comprises 65-75% of coarse aggregate and 25-35% of fine aggregate according to mass percentage.
The high-viscosity high-elasticity modified asphalt has high viscosity and high elasticity, and can improve the oil film thickness of asphalt mixture, and the road performance of the mixture using the asphalt exceeds that of the traditional AC and SMA asphalt mixture. In addition, basalt fibers are added, so that the effect of stabilizing surplus asphalt is achieved, the asphalt consumption of the fiber-reinforced high-toughness asphalt mixture can be greatly improved, the thickness of an asphalt oil film of the whole mixture is improved, and the durability of the fiber-reinforced high-toughness asphalt mixture is further enhanced; on the other hand, plays a role in reinforcing the asphalt mixture, and fibers are uniformly dispersed in the asphalt mixture to construct a three-phase mixture structure of fibers, asphalt and mineral aggregates; the cracking resistance, the tensile resistance, the shearing resistance and the rutting resistance of the asphalt mixture can be greatly improved by combining basalt fibers with the high-viscosity high-elasticity modified asphalt, the occurrence probability of early diseases of the pavement is reduced, and the service life can be prolonged by about 1.5 times.
Further, the high asphalt consumption can lead the durability and the cracking resistance of the asphalt mixture to be better, but in fact, the asphalt mixture is not simple, the traditional SMA asphalt mixture is of an asphalt mixture structure with high asphalt consumption, but the oil-stone ratio of the traditional SMA asphalt mixture is only about 6.0 percent, compared with the SMA, the fiber reinforced high-toughness asphalt mixture further increases the asphalt consumption, and the coarse aggregate and the fine aggregate form a skeleton compact structure, and the high-performance high-viscosity high-elasticity modified asphalt with high doping amount and basalt fiber replace part of fine aggregate, thereby reducing the consumption of mineral powder, being capable of obtaining the fiber reinforced high-toughness asphalt mixture with ultrahigh asphalt mass, effectively increasing the asphalt film thickness of the asphalt mixture and further improving the performance of the asphalt mixture.
The fiber reinforced high-toughness asphalt mixture has the advantages that the thickness of an asphalt oil film is increased, the durability, the crack resistance, the tensile resistance, the shearing resistance and the rutting resistance are improved, and the technical problems that the durability of the traditional high-toughness asphalt mixture is poor and the service performance cannot meet the requirements are solved.
Further described, the dynamic viscosity of the high-viscosity high-elasticity modified asphalt at 60 ℃ is greater than 400000 Pa.s, and the composite shear modulus G at 60 DEG C * The elastic recovery rate is more than 95 percent at 25 ℃ and more than 10 kPa.
The high-viscosity high-elasticity modified asphalt uses the SBS modifier (modified asphalt of patent application number 201711461130.5) with high doping amount, and the dynamic viscosity, the composite shear modulus and the elastic recovery rate meet the requirements, so that the service performance of the fiber reinforced high-toughness asphalt mixture can be ensured.
Preferably, the dynamic viscosity of the high-viscosity high-elasticity modified asphalt at 60 ℃ is more than 580000 Pa.s, and the composite shear modulus G at 60 DEG C * The elastic recovery rate at 25 ℃ is more than 96 percent and is more than 12 kPa.
Preferably, the basalt fiber has a diameter of 14 μm to 16 μm and a length of 5.5mm to 6.5mm.
The diameter and the length of the basalt fiber are preferably in the range, so that the dispersion effect of the basalt fiber in the raw material mixing process can be ensured, and the cracking resistance, the tensile resistance, the shearing resistance and the rutting resistance of the fiber-reinforced high-toughness asphalt mixture are ensured, and the basalt fiber is not easy to uniformly disperse in the mixture stirring process due to the fact that the diameter and the length of the basalt fiber are too large or too small.
Preferably, the basalt fiber has tensile strength of more than 2500MPa, elastic modulus of more than 85GPa and elongation at break of more than 3%.
The basalt fiber mainly has the effect of reinforcing the asphalt mixture, so that the tensile strength, the elastic modulus and the breaking elongation of the basalt fiber are preferably in the range, and the reinforcing effect of the basalt fiber on the fiber-reinforced high-toughness asphalt mixture is fully ensured.
Preferably, the tensile strength of the basalt fiber is 2600 MPa-2800 MPa, the elastic modulus is greater than 90 GPa-100 GPa, and the breaking elongation is 4% -6%.
Further, the mineral aggregate further comprises mineral powder, wherein coarse aggregate with the particle size of 5-10 mm accounts for 45-55% of the total mass of the mineral aggregate, coarse aggregate with the particle size of 3-5 mm accounts for 15-25% of the total mass of the mineral aggregate, fine aggregate with the particle size of less than 3mm accounts for 25-35% of the total mass of the mineral aggregate, and mineral powder accounts for 0-4% of the total mass of the mineral aggregate.
The grading design in the mineral aggregate is beneficial to constructing the asphalt mixture with a skeleton compact structure with rich surface structure and higher friction coefficient on the basis of low mineral powder and low fine aggregate, is beneficial to ensuring the thickness of the asphalt film and enhancing the durability and comprehensive use performance of the asphalt mixture.
Specifically, the coarse aggregate and the fine aggregate are diabase or basalt respectively, and the mineral powder is limestone.
Diabase and basalt have the characteristics of high compressive strength and hardness, and good road performance, and limestone can be used as mineral powder to effectively improve the corrosion resistance of asphalt mixture, so that the problems of early breakage and service life of asphalt pavement are effectively improved and prolonged.
Further, the overall grading range of the mineral aggregate is as follows:
| screen hole (mm) | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Yield (%) | 100 | 95-100 | 45-55 | 23-30 | 15-20 | 10-15 | 5-10 | 4-8 | 3-6 |
。
The whole grading range of the mineral aggregate is optimized, so that the asphalt mixture with a skeleton compact structure with rich surface structure and higher friction coefficient is constructed on the basis of low mineral powder and low fine aggregate, and the durability and comprehensive use performance of the asphalt mixture are enhanced.
The whole grading design of the mineral aggregate meets the above range, and the mineral powder is mainly used for forming mucilage with asphalt and fiber to fill gaps among coarse and fine aggregates in the asphalt mixture. If the aggregate with the diameter of less than 0.075mm in the fine aggregate is relatively high, the mineral powder can not be additionally mixed under the condition of meeting the requirements of grading design. The more mineral powder, the lower the overall oil film thickness of the fiber-reinforced high-toughness asphalt mixture.
The preparation method of the fiber reinforced high-toughness asphalt mixture is used for preparing the fiber reinforced high-toughness asphalt mixture and comprises the following steps of:
step (1), heating high-viscosity high-elasticity modified asphalt, basalt fiber and mineral aggregate for standby;
and (2) mixing the coarse aggregate and the fine aggregate, adding basalt fiber, mixing, adding high-viscosity high-elasticity modified asphalt, mixing, and finally adding mineral powder, mixing to obtain the fiber-reinforced high-toughness asphalt mixture.
On one hand, basalt fibers play a role in stabilizing surplus asphalt, so that the asphalt dosage of the fiber-reinforced high-toughness asphalt mixture can be greatly increased, the overall asphalt oil film thickness of the mixture is increased, and the durability of the high-toughness asphalt mixture is further enhanced; on the other hand, the method plays a role in reinforcing the asphalt mixture, and after mixing coarse aggregate and fine aggregate, basalt fiber is added for mixing, then high-viscosity high-elasticity modified asphalt is added for mixing, basalt fiber is uniformly dispersed in the asphalt mixture in the mixing process, a three-phase mixture structure of fiber, asphalt and mineral aggregate is constructed, and the fiber-reinforced high-toughness asphalt mixture with improved asphalt oil film thickness, durability, crack resistance, tensile resistance, shearing resistance and rutting resistance can be prepared.
Preferably, in the step (1), the high-viscosity high-elasticity modified asphalt is heated to 185 ℃ for standby, and the basalt fiber and the mineral aggregate are heated to 195 ℃ for standby.
In the preparation process, the high-viscosity high-elasticity modified asphalt, the basalt fiber and the mineral aggregate are all required to be preheated for standby and then mixed, so that the mixing effect of the raw materials is ensured.
Preferably, in the step (2), coarse aggregate and fine aggregate are mixed for 10 s-15 s at 195 ℃, basalt fiber is added for mixing for 25 s-30 s, high-viscosity high-elasticity modified asphalt is added for mixing for 80 s-85 s, and mineral powder is added for mixing for 120 s-125 s, so that the fiber-reinforced high-toughness asphalt mixture is prepared.
Firstly mixing coarse aggregate and fine aggregate at 195 ℃ for 10-15 s, adding basalt fiber for 25-30 s, adding high-viscosity high-elasticity modified asphalt for 80-85 s, and finally adding mineral powder for 120-125 s, so as to ensure the mixing uniformity of the raw materials and the use effect of the fiber-reinforced high-toughness asphalt mixture.
The present invention is described more fully below in order to facilitate an understanding of the present invention. This invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The examples are not to be construed as limiting the specific techniques or conditions described in the literature in this field or as per the specifications of the product. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
A preparation method of a fiber reinforced high-toughness asphalt mixture comprises the following steps:
step (1), heating high-viscosity high-elasticity modified asphalt to 185 ℃ for standby, and heating basalt fibers and mineral aggregate to 195 ℃ for standby;
heating the mixing cylinder to 195 ℃, adding coarse aggregate and fine aggregate into the mixing cylinder, mixing for 10s, adding basalt fiber, mixing for 25s, adding high-viscosity high-elasticity modified asphalt, and mixing for 80s to obtain a fiber-reinforced high-toughness asphalt mixture;
the raw materials of the fiber reinforced high-toughness asphalt mixture are 8% of high-viscosity high-elasticity modified asphalt, 0.3% of basalt fiber and 91.7% of mineral aggregate according to mass percentage;
dynamic viscosity of the high-viscosity high-elasticity modified asphalt at 60 ℃ is 430782 Pa.s, and composite shear modulus G at 60 DEG C * An elastic recovery rate at 25℃of 96.7% at 11.78 kPa;
the basalt fiber has the diameter of 15 mu m, the length of 6mm, the tensile strength of 2600MPa, the elastic modulus of 90GPa and the breaking elongation of 4%;
in the mineral aggregate, coarse aggregate with the grain size of 5-10 mm accounts for 50% of the total mass of the mineral aggregate, coarse aggregate with the grain size of 3-5 mm accounts for 20% of the total mass of the mineral aggregate, fine aggregate with the grain size of less than 3mm accounts for 30% of the total mass of the mineral aggregate, mineral powder accounts for 0% of the total mass of the mineral aggregate, the coarse aggregate and the fine aggregate are diabase respectively, the mineral powder is limestone, and the mineral aggregate has the following grading:
| screen hole (mm) | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Yield (%) | 100 | 99.1 | 50.1 | 24.3 | 17.1 | 13.7 | 6.9 | 5.1 | 3.3 |
Example 2
Compared with the embodiment 1, in the embodiment, the raw materials of the fiber reinforced high-toughness asphalt mixture are 8.5% of high-viscosity high-elasticity modified asphalt, 0.4% of basalt fiber and 91.1% of mineral aggregate according to the mass percentage, and the rest preparation methods and raw materials are the same as those in the embodiment 1, so that the fiber reinforced high-toughness asphalt mixture is prepared.
Example 3
Compared with the embodiment 1, in the embodiment, the raw materials of the fiber reinforced high-toughness asphalt mixture are 7.5% of high-viscosity high-elasticity modified asphalt, 0.2% of basalt fiber and 92.3% of mineral aggregate according to the mass percentage, and the rest preparation methods and raw materials are the same as those in the embodiment 1, so that the fiber reinforced high-toughness asphalt mixture is prepared.
Example 4
A preparation method of a fiber reinforced high-toughness asphalt mixture comprises the following steps:
step (1), heating high-viscosity high-elasticity modified asphalt to 185 ℃ for standby, and heating basalt fibers and mineral aggregate to 195 ℃ for standby;
heating the mixing cylinder to 195 ℃, adding coarse aggregate and fine aggregate into the mixing cylinder, mixing for 10s, adding basalt fiber, mixing for 25s, adding high-viscosity high-elasticity modified asphalt, and mixing for 80s to obtain a fiber-reinforced high-toughness asphalt mixture;
the raw materials of the fiber reinforced high-toughness asphalt mixture are 8.5% of high-viscosity high-elasticity modified asphalt, 0.4% of basalt fiber and 91.1% of mineral aggregate according to mass percentage;
dynamic viscosity of the high-viscosity high-elasticity modified asphalt at 60 ℃ is 417595 Pa.s, and composite shear modulus G at 60 DEG C * An elastic recovery rate at 25℃of 97.1% at 11.65 kPa;
the basalt fiber has the diameter of 15 mu m, the length of 6mm, the tensile strength of 2600MPa, the elastic modulus of 90GPa and the breaking elongation of 4%;
in the mineral aggregate, coarse aggregate with the grain size of 5-10 mm accounts for 48% of the total mass of the mineral aggregate, coarse aggregate with the grain size of 3-5 mm accounts for 20% of the total mass of the mineral aggregate, fine aggregate with the grain size of less than 3mm accounts for 28% of the total mass of the mineral aggregate, mineral powder accounts for 4% of the total mass of the mineral aggregate, the coarse aggregate and the fine aggregate are diabase respectively, the mineral powder is limestone, and the mineral aggregate has the following grading:
| screen hole (mm) | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Yield (%) | 100 | 100 | 54.4 | 27.1 | 19.1 | 13.7 | 9.0 | 6.9 | 5.8 |
Example 5
Compared with example 1, in this example, basalt fiber has a length of 12mm, and the rest of the preparation method and raw materials are the same as those in example 1, so as to prepare a fiber-reinforced high-toughness asphalt mixture.
Example 6
Compared with example 1, in this example, basalt fiber has a length of 3mm, and the rest of the preparation method and raw materials are the same as those in example 1, so as to prepare a fiber-reinforced high-toughness asphalt mixture.
The fiber reinforced high-toughness asphalt mixtures prepared in examples 1 to 6 were subjected to tests of porosity, stability, rutting stability, kenta burg scattering test loss, freeze thawing cleavage test residual strength ratio, residual marshall stability and four-point bending fatigue, and the test methods and test results are shown in table 1 below:
table 1 Performance test method and results of fiber-reinforced high-toughness asphalt mixtures of examples 1 to 6
From test results, the fiber-reinforced high-toughness asphalt mixture with excellent service performance, good rutting resistance, small porosity, good durability and higher stability and low-temperature crack resistance can be obtained by constructing a three-phase mixture structure of fibers, asphalt and mineral aggregate, adopting high-dosage high-viscosity high-elasticity modified asphalt and adding basalt fibers, and reducing the dosage of mineral aggregate from the perspective of mineral aggregate design. The basalt fiber of example 5 has too long length, so that the basalt fiber is not easy to be dispersed uniformly in the mixing process of the mixture, the basalt fiber of example 6 has too short length, and the reinforcement effect is not obvious, so that the fiber reinforced high-toughness asphalt mixtures prepared in example 5 and example 6 have poorer service performance than those in example 1.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The fiber reinforced high-toughness asphalt mixture is characterized by comprising the following raw materials in percentage by mass: 7.5 to 8.5 percent of high-viscosity high-elasticity modified asphalt, 0.2 to 0.4 percent of basalt fiber and 91.1 to 92.3 percent of mineral aggregate;
the mineral aggregate comprises 65-75% of coarse aggregate and 25-35% of fine aggregate according to mass percentage.
2. The fiber reinforced high-toughness asphalt mixture according to claim 1, wherein the high-viscosity high-elasticity modified asphalt has a dynamic viscosity of greater than 400000 pa.s at 60 ℃ and a composite shear modulus G at 60 °c * The elastic recovery rate is more than 95 percent at 25 ℃ and more than 10 kPa.
3. The fiber reinforced high-toughness asphalt mixture according to claim 1, wherein the basalt fiber has a diameter of 14 μm to 16 μm and a length of 5.5mm to 6.5mm.
4. The fiber reinforced high-toughness asphalt mixture according to claim 1, wherein the basalt fiber has a tensile strength of more than 2500MPa, an elastic modulus of more than 85GPa, and an elongation at break of more than 3%.
5. The fiber reinforced high-toughness asphalt mixture according to claim 1, wherein the mineral aggregate further comprises mineral powder, wherein coarse aggregate with a particle size of 5-10 mm accounts for 45-55% of the total mass of the mineral aggregate, coarse aggregate with a particle size of 3-5 mm accounts for 15-25% of the total mass of the mineral aggregate, fine aggregate with a particle size of less than 3mm accounts for 25-35% of the total mass of the mineral aggregate, and mineral powder accounts for 0-4% of the total mass of the mineral aggregate.
6. The fiber reinforced high-toughness asphalt mixture according to claim 5, wherein the coarse aggregate and the fine aggregate are diabase or basalt respectively, and the mineral powder is limestone.
7. The fiber reinforced high-toughness asphalt mixture according to claim 1, wherein the overall grading range of the mineral aggregate is as follows:
。
8. A method for preparing the fiber reinforced high-toughness asphalt mixture according to any one of claims 1 to 7, comprising the steps of:
step (1), heating high-viscosity high-elasticity modified asphalt, basalt fiber and mineral aggregate for standby;
and (2) mixing the coarse aggregate and the fine aggregate, adding basalt fiber, mixing, adding high-viscosity high-elasticity modified asphalt, mixing, and finally adding mineral powder, mixing to obtain the fiber-reinforced high-toughness asphalt mixture.
9. The method for preparing fiber reinforced high-toughness asphalt mixture according to claim 8, wherein in the step (1), the high-viscosity high-elasticity modified asphalt is heated to 185 ℃ for standby, and the basalt fiber and mineral aggregate are heated to 195 ℃ for standby.
10. The method for preparing a fiber reinforced high-toughness asphalt mixture according to claim 8, wherein in the step (2), coarse aggregate and fine aggregate are mixed at 195 ℃ for 10-15 s, basalt fiber is added and mixed for 25-30 s, high-viscosity high-elasticity modified asphalt is added and mixed for 80-85 s, and mineral powder is added and mixed for 120-125 s to prepare the fiber reinforced high-toughness asphalt mixture.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116768534A (en) * | 2023-08-16 | 2023-09-19 | 华运通达科技集团有限公司 | Cold mix asphalt mixture with high fatigue resistance and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116768534A (en) * | 2023-08-16 | 2023-09-19 | 华运通达科技集团有限公司 | Cold mix asphalt mixture with high fatigue resistance and preparation method thereof |
| CN116768534B (en) * | 2023-08-16 | 2024-01-02 | 华运通达科技集团有限公司 | Cold mix asphalt mixture with high fatigue resistance and preparation method thereof |
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