CN114716183A - Asphalt mixture mixed with short-cut and flocculent basalt fibers and preparation method thereof - Google Patents
Asphalt mixture mixed with short-cut and flocculent basalt fibers and preparation method thereof Download PDFInfo
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- CN114716183A CN114716183A CN202210397785.5A CN202210397785A CN114716183A CN 114716183 A CN114716183 A CN 114716183A CN 202210397785 A CN202210397785 A CN 202210397785A CN 114716183 A CN114716183 A CN 114716183A
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- 229920002748 Basalt fiber Polymers 0.000 title claims abstract description 157
- 239000010426 asphalt Substances 0.000 title claims abstract description 115
- 239000000203 mixture Substances 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 76
- 239000011707 mineral Substances 0.000 claims abstract description 75
- 239000000843 powder Substances 0.000 claims abstract description 40
- 239000000835 fiber Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000007822 coupling agent Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims description 49
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000004321 preservation Methods 0.000 claims description 12
- 238000006136 alcoholysis reaction Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000012986 modification Methods 0.000 claims description 8
- 230000004048 modification Effects 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000004381 surface treatment Methods 0.000 claims description 6
- 238000007580 dry-mixing Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 235000019441 ethanol Nutrition 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims 1
- 201000010099 disease Diseases 0.000 abstract 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 125000002252 acyl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000013521 mastic Substances 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 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
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Road Paving Structures (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to a bituminous mixture of short-cut and flocculent basalt fiber and a preparation method thereof, which comprises mineral aggregate with the mass fraction of 93-95.4%, blended fiber with the mass fraction of 0.3-0.45% and SBS modified asphalt with the mass fraction of 4.2-6.6% calculated by mass percentage; the mineral aggregate comprises coarse aggregate, fine aggregate and mineral powder, and the coarse aggregate is basalt; both the chopped basalt fiber and the flocculent basalt fiber are modified by a Si-69, KH350 or KH572 coupling agent; the short basalt fibers and the flocculent basalt fibers are mixed in the prepared asphalt mixture, so that the high-temperature performance, the low-temperature performance and the water damage resistance of the asphalt mixture are improved, the problems of diseases such as rutting, cracks and the like of an asphalt pavement are solved, the use quality of the pavement is improved, the service life of the asphalt pavement is prolonged, the comprehensive performance is better, and the economic benefit is better.
Description
Technical Field
The invention relates to an asphalt mixture mixed with chopped and flocculent basalt fibers and a preparation method thereof, belonging to the technical field of road engineering materials.
Background
With the continuous development of highway construction in China, the total mileage of a highway is continuously increased, wherein the mileage of an expressway is stably kept in the first place in the world and reaches 16.1 kilometers, and the urban coverage rate of the expressway on more than 20 thousands of urban area resident population exceeds 95%. The asphalt pavement is widely applied to the construction of expressways, airport roads and the like due to the advantages of high strength, good durability, good elastic-plastic deformation capability, high driving comfort, simpler maintenance, environmental protection, recyclability and the like.
However, with the increase of application scenes, the problems that the service life of the asphalt pavement is shorter than expected, rutting is easy to occur at high temperature in summer, the pavement is easy to crack in a wet zone in winter and the like also occur in practical use, and the normal use of the pavement is seriously influenced. In order to adapt to the rapid development of the road transportation industry in China, higher requirements on the performance of the asphalt pavement are required.
At present, a plurality of fibers are applied to asphalt mixtures to improve the performance of the asphalt mixtures, wherein the basalt fibers are high-performance green environment-friendly inorganic mineral fibers with multiple excellent performances such as excellent mechanical property, corrosion resistance, good dielectric property and the like. The basalt chopped fibers are doped into the asphalt mixture, so that the low-temperature cracking resistance, the fatigue cracking resistance and the freeze-thaw resistance of the asphalt mixture can be effectively improved, but the basalt chopped fibers have poor adsorption capacity on asphalt, so that the fiber-asphalt interface performance is poor, and the improvement on the high-temperature performance and the water loss resistance of the asphalt mixture is limited. The flocculent basalt fibers are doped into the asphalt mixture, so that the high-temperature rutting deformation resistance and the water damage resistance of the asphalt mixture can be effectively improved, but the flocculent basalt fibers are easy to agglomerate and difficult to disperse when being added into the asphalt mixture, and the mechanical property of the asphalt mixture is improved and is not enough compared with that of the chopped basalt fibers. There is therefore a need for a new manufacturing technique that produces a mix that addresses the above deficiencies while meeting performance.
Disclosure of Invention
The invention provides an asphalt mixture mixed with short-cut and flocculent basalt fibers and a preparation method thereof, which can improve the performances of high-temperature rutting resistance, low-temperature cracking resistance, water damage resistance and the like of the asphalt mixture and simultaneously reduce the problems of poor adsorption capacity, easy agglomeration and difficult dispersion.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the asphalt mixture mixed with the chopped basalt fibers and the flocculent basalt fibers comprises the following components in percentage by mass: 93-95.4% of mineral aggregate, 0.3-0.45% of blended fiber and 4.2-6.6% of SBS modified asphalt;
the mineral aggregate comprises No. 1 coarse aggregate, No. 2 coarse aggregate, fine aggregate and mineral powder, wherein the mineral powder accounts for 9-11% of the total mass of the mineral aggregate, and the mass percentages of the No. 1 coarse aggregate, the No. 2 coarse aggregate and the fine aggregate in the mineral aggregate are respectively 35-40%, 35-40% and 10-15%;
the No. 1 coarse aggregate is basalt with the average diameter of 11-16mm, and the No. 2 coarse aggregate is basalt with the diameter of 6-11 mm; the fine aggregate is basalt with the average diameter of 4-6mm, and the mineral powder is the basalt with the average diameter of less than or equal to 0.075mm after being ground;
the blended fiber is a mixture of chopped basalt fiber and flocculent basalt fiber, wherein the mass ratio of the chopped basalt fiber to the flocculent basalt fiber is 1-3:3-1, and the chopped basalt fiber and the flocculent basalt fiber are modified by a Si-69, KH350 or KH572 coupling agent;
as a further preferable aspect of the present invention, said chopped basalt fiber is a basalt fiber having a length of 3 to 12mm and an average diameter of 10 to 30 μm;
as a further preferable aspect of the present invention, the flocculent basalt fiber is a basalt fiber having a length of 0.1 to 6mm and an average diameter of 1 to 9 μm;
in a further preferred aspect of the present invention, the blended fibers have a mass ratio of the chopped basalt fibers to the flocculent basalt fibers of 1:1 or 2:1 or 3: 2.
The preparation method of the asphalt mixture blended with the chopped and flocculent basalt fibers specifically comprises the following steps:
step S1: deionized water and absolute ethyl alcohol are mixed according to the mass percentage of 3: 7, preparing three cups of ethanol solution, adding a silane coupling agent with the mass fraction of 5%, and stirring to obtain alcoholysis solution of the silane coupling agent;
step S2: fully alcoholyzing the alcoholysis solution of the silane coupling agent obtained in the step S1, cleaning and drying chopped basalt fibers and flocculent basalt fibers which are not subjected to surface treatment, placing the cleaned and dried chopped basalt fibers and flocculent basalt fibers in the solution of the silane coupling agent subjected to alcoholysis, fully stirring and uniformly infiltrating the solution by a stirrer, taking out the solution, filtering and drying the solution to obtain chopped basalt fibers and flocculent basalt fibers which are subjected to surface modification by the silane coupling agent;
step S3: weighing mineral aggregate, blended fiber and SBS modified asphalt according to mass fraction for later use, placing the weighed SBS modified asphalt in an oven to be heated to a molten state, and keeping the temperature for later use;
step S4: preheating the mineral aggregate weighed in the step S3;
step S5: heating a mixing pot to 180 +/-5 ℃, adding the preheated mineral aggregate into the mixing pot, doping chopped basalt fibers and flocculent basalt fibers for dry mixing, and finally adding the SBS modified asphalt for standby heat preservation in the step S3 for mixing;
as a further preferable aspect of the present invention, in step S2, chopped basalt fibers and flocculent basalt fibers which are not subjected to surface treatment are washed, dried, then placed in the alcoholysis-performed silane coupling agent solution, thoroughly and uniformly stirred by a stirrer for 0.5h, then taken out, filtered and dried;
as a further preferred aspect of the present invention, in step S3, the weighed SBS modified asphalt is placed in an oven to be heated to a molten state at 165 ± 5 ℃, and is kept warm for later use;
as a further preferred embodiment of the present invention, in step S4, the weighed mineral aggregate is preheated at 185 ± 5 ℃ for at least 5 h;
as a further preferred of the present invention, in step S5, the time for dry mixing by blending chopped basalt fiber and flocculent basalt fiber is 25S, and the time for mixing by adding SBS modified asphalt for standby use in step S3 is 90-95S;
as a further preferred mode of the invention, the asphalt mixture adopts SMA-13 discontinuous gradation.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the blended fiber in the asphalt mixture prepared by the invention is a mixture of chopped basalt fiber and flocculent basalt fiber, the low-temperature stability of the asphalt mixture can be improved, the failure strain is improved by 11.2 percent compared with the conventional SMA-13 asphalt mixture, the failure strain is improved by 3.5 percent compared with the chopped basalt fiber reinforced SMA-13 asphalt mixture, and the failure strain is improved by 7.32 percent compared with the flocculent basalt fiber reinforced SMA-13 asphalt mixture;
2. according to the asphalt mixture prepared by the invention, the chopped basalt fibers and the flocculent basalt fibers are added in a mixed manner, so that on one hand, the reinforcement effect of the chopped basalt is exerted, the low-temperature anti-cracking performance of the asphalt mixture is improved, on the other hand, the adsorption effect of the flocculent basalt fibers on asphalt is exerted, the effect of stabilizing mastic is exerted, the high-temperature stability of the asphalt mixture is improved, compared with the conventional SMA-13 asphalt mixture, the stability of soaking residues is improved by 7%, and the ratio of freeze-thaw splitting strength is improved by 9.3%;
3. according to the asphalt mixture prepared by the invention, the Si-69 or KH350 or KH572 coupling agent is used for carrying out surface treatment on the chopped basalt fiber and the flocculent basalt fiber, so that the interface performance of the fiber and the asphalt can be improved, and further, various performances of the asphalt mixture are improved, compared with the asphalt mixture which is not modified by using the silane coupling agent, the dynamic stability is improved by 1.9%, and the damage strain is improved by 2.8%.
Detailed Description
As explained in the background art, the asphalt mixture adopted by the existing asphalt pavement cannot simultaneously meet various performance requirements, so that after a plurality of experiments, the application summarizes a preparation method, and based on the components set by the proportion of the preparation method, various indexes of the asphalt mixture can be met.
Specifically, firstly, the asphalt mixture mixed with the chopped and flocculent basalt fibers provided by the application comprises the following components in percentage by mass: 93-95.4% of mineral aggregate, 0.3-0.45% of blended fiber and 4.2-6.6% of SBS modified asphalt; the mineral aggregate comprises No. 1 coarse aggregate, No. 2 coarse aggregate, fine aggregate and mineral powder, wherein the mineral powder accounts for 9-11% of the total mass of the mineral aggregate, and the mass percentages of the No. 1 coarse aggregate, the No. 2 coarse aggregate and the fine aggregate in the mineral aggregate are respectively 35-40%, 35-40% and 10-15%; the No. 1 coarse aggregate is basalt with the average diameter of 11-16mm, and the No. 2 coarse aggregate is basalt with the diameter of 6-11 mm; the fine aggregate is basalt with the average diameter of 4-6mm, and the mineral powder is the basalt with the average diameter of less than or equal to 0.075mm after being ground;
the blended fiber is a mixture of chopped basalt fiber and flocculent basalt fiber, wherein the mass ratio of the chopped basalt fiber to the flocculent basalt fiber is 1-3:3-1, and the chopped basalt fiber and the flocculent basalt fiber are modified by a Si-69, KH350 or KH572 coupling agent. It needs to be clarified here that the characteristic functional groups of the modified coupling agent are sulfhydryl, octyl and acyl respectively, and when the asphalt material is mixed, the blended fiber is modified first, so as to improve the adsorption capacity of the chopped basalt fiber and the flocculent basalt fiber relative to the asphalt while acquiring the advantages of the chopped basalt fiber and the flocculent basalt fiber, thereby stabilizing the asphalt structure and enhancing the interface performance of the fiber and the asphalt.
In a preferred embodiment, the chopped basalt fibers are basalt fibers with the length of 3-12mm and the average diameter of 10-30 μm. The flocculent basalt fiber is a basalt fiber with the length of 0.1-6mm and the average diameter of 1-9 mu m. Meanwhile, the mass ratio of the chopped basalt fibers to the flocculent basalt fibers is limited, and the effect is the best when the mass ratio of the chopped basalt fibers to the flocculent basalt fibers is 1:1 or 2:1 or 3:2 in the blended fibers. Meanwhile, in the preferred embodiment, the SBS modified asphalt is prepared by Jinling asphalt modification (1-D) produced by Nanjing national asphalt Co.
The application provides a preparation method of the asphalt mixture mixed with the chopped and flocculent basalt fibers, which is characterized by comprising the following steps: the method specifically comprises the following steps:
step S1: deionized water and absolute ethyl alcohol are mixed according to the mass percentage of 3: 7, preparing three cups of ethanol solution, adding a silane coupling agent with the mass fraction of 5%, and stirring to obtain alcoholysis solution of the silane coupling agent;
step S2: fully alcoholyzing the alcoholysis solution of the silane coupling agent obtained in the step S1, cleaning and drying chopped basalt fibers and flocculent basalt fibers which are not subjected to surface treatment, placing the cleaned and dried chopped basalt fibers and flocculent basalt fibers in the solution of the silane coupling agent subjected to alcoholysis, fully stirring the solution by a stirrer and uniformly soaking the solution for 0.5h, taking out the solution, filtering and drying the solution to obtain chopped basalt fibers and flocculent basalt fibers subjected to surface modification by the silane coupling agent;
step S3: weighing mineral aggregate, blended fiber and SBS modified asphalt according to mass fraction for later use, placing the weighed SBS modified asphalt in an oven, heating to a molten state at 165 +/-5 ℃, and preserving heat for later use;
step S4: preheating the mineral aggregate weighed in the step S3 at 185 +/-5 ℃, wherein the heating time is at least 5 h;
step S5: heating the mixing pot to 180 +/-5 ℃, adding the preheated mineral aggregate into the mixing pot, adding the chopped basalt fibers and the flocculent basalt fibers for dry mixing for 25S, and finally adding the SBS modified asphalt which is preserved for standby in the step S3 for mixing for 90-95S. The implementation of the step can ensure that the chopped basalt fibers and the flocculent basalt fibers have good dispersibility in the asphalt and avoid the agglomeration phenomenon.
In the application, the asphalt mixture adopts SMA-13 discontinuous gradation.
The proportion of the asphalt mixture and the preparation method which are intended to be obtained by the application are explained above, and then the performance of the mixed asphalt obtained by the preparation method is tested and verified.
Example 1
Firstly, heating SBS modified asphalt in a 160 ℃ oven to a molten state, and preserving heat for later use; heating coarse aggregates, fine aggregates and mineral powder (wherein the proportion of the 1# coarse aggregates to the 2# coarse aggregates to the fine aggregates to the mineral powder in the total mass of the mineral aggregate is 36.0:39.0:15.0:10.0) and mixed basalt fibers with the total mass of 0.45% at 190 ℃ for more than 5 hours, wherein the mixed basalt fibers are formed by mixing chopped basalt fibers and flocculent basalt fibers according to the mass ratio of 1: 1; and mixing the coarse and fine aggregates, mineral powder and the blended fibers in a mixing pot for 25s, adding the SBS modified asphalt (accounting for 5.6 percent of the total mass percentage) for standby heat preservation, and continuously mixing for 90-95s to prepare the asphalt mixture of the blended chopped and flocculent basalt fibers.
Example 2
Firstly, the SBS modified asphalt is heated to a molten state in a 160 ℃ oven, and the temperature is kept for standby. Heating coarse aggregates, fine aggregates and mineral powder (wherein the proportion of the 1# coarse aggregates to the 2# coarse aggregates to the fine aggregates to the mineral powder in the total mass of the mineral aggregate is 36.0:39.0:15.0:10.0) and mixed basalt fibers with the total mass of 0.45% at 190 ℃ for more than 5 hours, wherein the mixed basalt fibers are formed by mixing chopped basalt fibers and flocculent basalt fibers according to the mass ratio of 2: 1; and mixing the coarse and fine aggregates, mineral powder and the blended fibers in a mixing pot for 25s, adding the SBS modified asphalt (accounting for 5.6 percent of the total mass percentage) for standby heat preservation, and continuously mixing for 90-95s to prepare the asphalt mixture of the blended chopped and flocculent basalt fibers.
Example 3
Firstly, the SBS modified asphalt is heated to a molten state in a 160 ℃ oven, and the temperature is kept for standby. Heating coarse aggregates, fine aggregates and mineral powder (wherein the proportion of the 1# coarse aggregates to the 2# coarse aggregates to the fine aggregates to the mineral powder in the total mass of the mineral aggregate is 36.0:39.0:15.0:10.0) and mixed basalt fibers with the total mass of 0.45% at 190 ℃ for more than 5 hours, wherein the mixed basalt fibers are formed by mixing chopped basalt fibers and flocculent basalt fibers according to the mass ratio of 3: 1; and mixing the coarse and fine aggregates, mineral powder and the blended fibers in a mixing pot for 25s, adding the SBS modified asphalt (accounting for 5.6 percent of the total mass percentage) for standby heat preservation, and continuously mixing for 90-95s to prepare the asphalt mixture of the blended chopped and flocculent basalt fibers.
Example 4
Firstly, the SBS modified asphalt is heated to a molten state in a 160 ℃ oven, and the temperature is kept for standby. Heating coarse aggregates, fine aggregates and mineral powder (wherein the proportion of the 1# coarse aggregates to the 2# coarse aggregates to the fine aggregates to the mineral powder in the total mass of the mineral aggregate is 36.0:39.0:15.0:10.0) and mixed basalt fibers with the total mass of 0.45% at 190 ℃ for more than 5 hours, wherein the mixed basalt fibers are formed by mixing chopped basalt fibers and flocculent basalt fibers according to the mass ratio of 3: 2; and mixing the coarse and fine aggregates, mineral powder and the blended fibers in a mixing pot for 25s, adding the SBS modified asphalt (accounting for 5.6 percent of the total mass percentage) for standby heat preservation, and continuously mixing for 90-95s to prepare the asphalt mixture of the blended chopped and flocculent basalt fibers.
Example 5
Firstly, the SBS modified asphalt is heated to a molten state in a 160 ℃ oven, and the temperature is kept for standby. Heating coarse aggregates, fine aggregates and mineral powder (wherein the proportion of the 1# coarse aggregates to the 2# coarse aggregates to the fine aggregates to the mineral powder in the total mass of the mineral aggregate is 36.0:39.0:15.0:10.0) and mixed basalt fibers with the total mass of 0.45% at 190 ℃ for more than 5 hours, wherein the mixed basalt fibers are formed by mixing chopped basalt fibers and flocculent basalt fibers according to the mass ratio of 3:2, and carrying out surface modification by using a KH572 silane coupling agent; and mixing the coarse and fine aggregates, mineral powder and the blended fibers in a mixing pot for 25s, adding the SBS modified asphalt (accounting for 5.6 percent of the total mass percentage) for standby heat preservation, and continuously mixing for 90-95s to prepare the asphalt mixture of the blended chopped and flocculent basalt fibers.
Example 6
Firstly, the SBS modified asphalt is heated to a molten state in a 160 ℃ oven, and the temperature is kept for standby. Heating coarse aggregates, fine aggregates and mineral powder (wherein the proportion of the 1# coarse aggregates to the 2# coarse aggregates to the fine aggregates to the mineral powder in the total mass of the mineral aggregate is 36.0:39.0:15.0:10.0) and mixed basalt fibers with the total mass of 0.45% at 190 ℃ for more than 5 hours, wherein the mixed basalt fibers are formed by mixing chopped basalt fibers and flocculent basalt fibers according to the mass ratio of 3:2, and carrying out surface modification by using a Si-69 silane coupling agent; and mixing the coarse and fine aggregates, mineral powder and the blended fibers in a mixing pot for 25s, adding the SBS modified asphalt (accounting for 5.6 percent of the total mass percentage) for standby heat preservation, and continuously mixing for 90-95s to prepare the asphalt mixture of the blended chopped and flocculent basalt fibers.
Example 7
Firstly, the SBS modified asphalt is heated to a molten state in a 160 ℃ oven, and the temperature is kept for standby. Heating coarse aggregates, fine aggregates and mineral powder (wherein the proportion of the 1# coarse aggregates to the 2# coarse aggregates to the fine aggregates to the mineral powder in the total mass of the mineral aggregate is 36.0:39.0:15.0:10.0) and mixed basalt fibers with the total mass of 0.45% at 190 ℃ for more than 5 hours, wherein the mixed basalt fibers are formed by mixing chopped basalt fibers and flocculent basalt fibers according to the mass ratio of 3:2, and performing surface modification by using a KH350 silane coupling agent; and mixing the coarse and fine aggregates, mineral powder and the blended fibers in a mixing pot for 25s, adding the SBS modified asphalt (accounting for 5.6 percent of the total mass percentage) for standby heat preservation, and continuously mixing for 90-95s to prepare the asphalt mixture of the blended chopped and flocculent basalt fibers.
Comparative example 1
The SBS modified asphalt is heated in an oven at 160 ℃ to be in a molten state, and the temperature is kept for standby. Heating coarse aggregates, fine aggregates and mineral powder (wherein the proportion of the 1# coarse aggregates to the 2# coarse aggregates to the fine aggregates to the mineral powder in the total mass of the mineral aggregate is 36.0:39.0:15.0:10.0) and chopped basalt fibers with the total mass of 0.45 percent at 190 ℃ for more than 5 hours in advance; and mixing the coarse and fine aggregates, mineral powder and the blended fibers in a mixing pot for 25s, adding SBS modified asphalt (accounting for 5.6 percent of the total mass percentage) for standby heat preservation, and continuously mixing for 90-95s to prepare the asphalt mixture of the single-blended chopped basalt fibers.
Comparative example 2
Firstly, the SBS modified asphalt is heated to a molten state in a 160 ℃ oven, and the temperature is kept for standby. Heating coarse aggregates, fine aggregates and mineral powder (wherein the proportion of the 1# coarse aggregates to the 2# coarse aggregates to the fine aggregates to the mineral powder in the total mass of the mineral aggregate is 36.0:39.0:15.0:10.0) and flocculent basalt fibers accounting for 0.45 percent of the total mass at 190 ℃ for more than 5 hours in advance; and mixing the coarse and fine aggregates, mineral powder and the blended fibers in a mixing pot for 25s, adding SBS modified asphalt (accounting for 5.6 percent of the total mass percentage) for standby heat preservation, and continuously mixing for 90-95s to prepare the asphalt mixture of the single-blended flocculent basalt fibers.
Comparative example 3
Firstly, the SBS modified asphalt is heated to a molten state in a 160 ℃ oven, and the temperature is kept for standby. Heating coarse aggregates, fine aggregates and mineral powder (wherein the proportion of the 1# coarse aggregates to the 2# coarse aggregates to the fine aggregates to the mineral powder in the total mass of the mineral aggregate is 36.0:39.0:15.0:10.0) and lignin fibers accounting for 0.45 percent of the total mass for more than 5 hours at 190 ℃; and mixing the coarse and fine aggregates, mineral powder and the blended fibers in a mixing pot for 25s, adding SBS modified asphalt (accounting for 5.6 percent of the total mass percentage) for standby heat preservation, and continuously mixing for 90-95s to prepare the asphalt mixture of the single-blended flocculent basalt fibers.
The water stability and low temperature resistance of the asphalt mixtures of examples 1-4 of the invention and the asphalt mixtures of basalt fiber single blended of comparative examples 1-2 are shown in table 1.
TABLE 1 road Performance test results for different types of asphalt mixtures
As can be seen from table 1: compared with the asphalt mixture with single-doped fiber in the comparative example, the asphalt mixture mixed with the chopped basalt fiber and the flocculent basalt fiber has the advantages that the high-temperature anti-rutting performance, the low-temperature anti-cracking performance and the water damage resistance are greatly improved, and the pavement performance is excellent.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The meaning of "and/or" as used herein is intended to include both the individual components or both.
The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. The asphalt mixture mixed with the chopped basalt fibers and the flocculent basalt fibers is characterized in that: calculated by mass percent, comprises the following components: 93-95.4% of mineral aggregate, 0.3-0.45% of blended fiber and 4.2-6.6% of SBS modified asphalt;
the mineral aggregate comprises No. 1 coarse aggregate, No. 2 coarse aggregate, fine aggregate and mineral powder, wherein the mineral powder accounts for 9-11% of the total mass of the mineral aggregate, and the mass percentages of the No. 1 coarse aggregate, the No. 2 coarse aggregate and the fine aggregate in the mineral aggregate are respectively 35-40%, 35-40% and 10-15%;
the No. 1 coarse aggregate is basalt with the average diameter of 11-16mm, and the No. 2 coarse aggregate is basalt with the diameter of 6-11 mm; the fine aggregate is basalt with the average diameter of 4-6mm, and the mineral powder is the basalt with the average diameter of less than or equal to 0.075mm after being ground;
the blended fiber is a mixture of chopped basalt fiber and flocculent basalt fiber, wherein the mass ratio of the chopped basalt fiber to the flocculent basalt fiber is 1-3:3-1, and the chopped basalt fiber and the flocculent basalt fiber are modified by a Si-69, KH350 or KH572 coupling agent.
2. The asphalt mix blended with chopped and flocculent basalt fibers of claim 1, wherein: the chopped basalt fibers are basalt fibers with the length of 3-12mm and the average diameter of 10-30 mu m.
3. The asphalt mixture blended with chopped and flocculent basalt fibers according to claim 1, wherein: the flocculent basalt fiber is a basalt fiber with the length of 0.1-6mm and the average diameter of 1-9 mu m.
4. The asphalt mixture blended with chopped and flocculent basalt fibers according to claim 1, wherein: in the blended fiber, the mass ratio of the chopped basalt fiber to the flocculent basalt fiber is 1:1 or 2:1 or 3: 2.
5. A method of preparing an asphalt mixture blended with chopped and flocculent basalt fibers according to any one of claims 1 to 4, wherein: the method specifically comprises the following steps:
step S1: deionized water and absolute ethyl alcohol are mixed according to the mass percentage of 3: 7, preparing three cups of ethanol solution, adding a silane coupling agent with the mass fraction of 5%, and stirring to obtain alcoholysis solution of the silane coupling agent;
step S2: fully alcoholyzing the alcoholysis liquid of the silane coupling agent obtained in the step S1, cleaning and drying chopped basalt fibers and flocculent basalt fibers which are not subjected to surface treatment, placing the cleaned and dried chopped basalt fibers and flocculent basalt fibers in the silane coupling agent solution subjected to alcoholysis, fully stirring and uniformly infiltrating the solution by a stirrer, taking out the soaked solution, filtering and drying the soaked solution to obtain chopped basalt fibers and flocculent basalt fibers subjected to surface modification by the silane coupling agent;
step S3: weighing mineral aggregate, blended fiber and SBS modified asphalt according to mass fraction for later use, placing the weighed SBS modified asphalt in an oven to be heated to a molten state, and keeping the temperature for later use;
step S4: preheating the mineral aggregate weighed in the step S3;
step S5: heating the mixing pot to 180 +/-5 ℃, adding the preheated mineral aggregate into the mixing pot, doping the chopped basalt fibers and the flocculent basalt fibers for dry mixing, and finally adding the SBS modified asphalt for standby heat preservation in the step S3 for mixing.
6. The method for preparing the asphalt mixture blended with chopped and flocculent basalt fibers according to claim 5, wherein: in step S2, chopped basalt fibers and flocculent basalt fibers which are not subjected to surface treatment are washed, dried, then placed in the alcoholysis-treated silane coupling agent solution, fully and uniformly stirred by a stirrer for soaking for 0.5h, then taken out, filtered and dried.
7. The method of preparing a bituminous mixture incorporating chopped and flocculent basalt fibers according to claim 6, wherein: in step S3, the SBS modified asphalt is put into an oven to be heated to a molten state at 165 +/-5 ℃, and the temperature is kept for standby.
8. The method of preparing a bituminous mixture incorporating chopped and flocculent basalt fibers according to claim 7, wherein: in step S4, the weighed mineral aggregate is preheated at 185 ± 5 ℃ for at least 5 h.
9. The method of preparing an asphalt mixture blended with chopped and flocculent basalt fibers according to claim 8, wherein: in the step S5, the time for dry mixing by doping chopped basalt fibers and flocculent basalt fibers is 25S, and finally the time for mixing by adding the SBS modified asphalt which is preserved for standby in the step S3 is 90-95S.
10. The method of preparing a bituminous mixture incorporating chopped and flocculent basalt fibers according to claim 9, wherein: the asphalt mixture adopts SMA-13 discontinuous gradation.
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