CN116606090B - Low-temperature modified asphalt concrete and preparation method thereof - Google Patents
Low-temperature modified asphalt concrete and preparation method thereof Download PDFInfo
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- CN116606090B CN116606090B CN202310599792.8A CN202310599792A CN116606090B CN 116606090 B CN116606090 B CN 116606090B CN 202310599792 A CN202310599792 A CN 202310599792A CN 116606090 B CN116606090 B CN 116606090B
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- 239000011384 asphalt concrete Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000000835 fiber Substances 0.000 claims abstract description 94
- 239000010426 asphalt Substances 0.000 claims abstract description 39
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 30
- 150000001875 compounds Chemical class 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 14
- 239000011159 matrix material Substances 0.000 claims abstract description 12
- 239000002131 composite material Substances 0.000 claims abstract description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 8
- 239000011707 mineral Substances 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 32
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 32
- 238000002156 mixing Methods 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 23
- STMDPCBYJCIZOD-UHFFFAOYSA-N 2-(2,4-dinitroanilino)-4-methylpentanoic acid Chemical compound CC(C)CC(C(O)=O)NC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O STMDPCBYJCIZOD-UHFFFAOYSA-N 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 20
- 239000003607 modifier Substances 0.000 claims description 20
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 19
- 239000002253 acid Substances 0.000 claims description 18
- 230000008878 coupling Effects 0.000 claims description 18
- 238000010168 coupling process Methods 0.000 claims description 18
- 238000005859 coupling reaction Methods 0.000 claims description 18
- 239000008367 deionised water Substances 0.000 claims description 18
- 229910021641 deionized water Inorganic materials 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 16
- 238000002791 soaking Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- RPNUMPOLZDHAAY-UHFFFAOYSA-N Diethylenetriamine Chemical compound NCCNCCN RPNUMPOLZDHAAY-UHFFFAOYSA-N 0.000 claims description 14
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 12
- HASCQPSFPAKVEK-UHFFFAOYSA-N dimethyl(phenyl)phosphine Chemical compound CP(C)C1=CC=CC=C1 HASCQPSFPAKVEK-UHFFFAOYSA-N 0.000 claims description 12
- 229920001971 elastomer Polymers 0.000 claims description 12
- 239000005060 rubber Substances 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000007865 diluting Methods 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- 238000002390 rotary evaporation Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims 4
- 239000003431 cross linking reagent Substances 0.000 claims 2
- 150000002978 peroxides Chemical class 0.000 claims 2
- 239000012670 alkaline solution Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 8
- 230000032683 aging Effects 0.000 abstract description 5
- 239000004567 concrete Substances 0.000 abstract description 5
- 239000011247 coating layer Substances 0.000 abstract description 4
- 125000001841 imino group Chemical group [H]N=* 0.000 abstract description 4
- 239000002344 surface layer Substances 0.000 abstract description 3
- 238000005336 cracking Methods 0.000 abstract description 2
- 230000003111 delayed effect Effects 0.000 abstract description 2
- 230000003139 buffering effect Effects 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 15
- 238000002386 leaching Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 description 4
- 238000010907 mechanical stirring Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 238000010257 thawing Methods 0.000 description 4
- 125000003396 thiol group Chemical class [H]S* 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000003776 cleavage reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 125000000962 organic group Chemical group 0.000 description 2
- 238000007142 ring opening reaction Methods 0.000 description 2
- 230000007017 scission Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 239000006173 Good's buffer Substances 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000012650 click reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007765 extrusion coating Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000413 hydrolysate Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010998 test method Methods 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
- 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to low-temperature modified asphalt concrete and a preparation method thereof, belonging to the technical field of asphalt concrete, wherein the concrete comprises the following components in parts by weight: 4.4-5.1 parts of matrix asphalt, 58-65 parts of coarse aggregate, 22-30 parts of fine aggregate, 4-6 parts of mineral powder and 6-10 parts of envelope composite fiber; the enveloping compound fiber takes basalt fiber as a matrix, a large number of imino structures are introduced into the surface layer, the aging time of a coating layer is delayed, and the accurate aging prevention of a region is realized, so that a relatively soft and crisscrossed fiber enveloping network is formed in concrete, the fiber enveloping network is filled between aggregates to play a buffering role, the cracking risk of the concrete is reduced, residual double bonds on the surface of the fiber are crosslinked with asphalt and liquid styrene-butadiene rubber in a high-temperature environment, the bonding strength of the fiber and the coating layer is improved, the fiber is not easy to separate from asphalt cementing materials, and the pivot connection function of the basalt fiber is fully exerted.
Description
Technical Field
The invention belongs to the technical field of asphalt concrete, and particularly relates to low-temperature modified asphalt concrete and a preparation method thereof.
Background
Asphalt concrete is commonly called asphalt concrete, and is a mixture prepared by manually selecting aggregate and mixing the aggregate with road asphalt material in a certain proportion under the strictly controlled condition. The pavement paved by asphalt concrete has the advantages of smooth surface, comfortable running, wear resistance, low noise, short construction period, and convenient maintenance, is generally applied to expressways in the initial stage, and is gradually popularized to town road construction in the current stage.
With the rapid development of economy, the defects of traffic load and traffic volume in road surface layers, particularly abrasion layers, of common asphalt are increasingly prominent, the requirements of improving the service quality of the road surface at present are difficult to meet, particularly in cold areas, the embrittlement of asphalt is achieved, the moisture in asphalt concrete is subjected to phase change, larger internal stress is generated, and under the action of external acting force and freeze thawing cycle, the asphalt concrete is prone to crack, so that the strength of the asphalt concrete road surface is reduced.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention aims to provide low-temperature modified asphalt concrete and a preparation method thereof.
The aim of the invention can be achieved by the following technical scheme:
the low-temperature modified asphalt concrete comprises the following raw materials in parts by weight:
4.4-5.1 parts of matrix asphalt, 58-65 parts of coarse aggregate, 22-30 parts of fine aggregate, 4-6 parts of mineral powder and 6-10 parts of envelope composite fiber;
the preparation method of the enveloping compound fiber comprises the following steps:
step A1: mixing a silane coupling agent KH580 and a dilute acid solution under the protection of nitrogen, adding basalt fibers, standing and soaking for 2-3 hours at room temperature to enable the silane coupling agent KH580 to be fully hydrolyzed, then adding an alkali solution to adjust the pH to be neutral, soaking for 12 hours again, condensing hydrolysate of the silane coupling agent KH580 with the basalt fibers, grafting organic groups containing mercapto on the surfaces of the basalt fibers, taking out the fibers, cleaning and draining to obtain the coupled fibers;
further, the dosage ratio of basalt fiber to silane coupling agent KH580 is 100g:8-12mL, wherein the pH value of the dilute acid solution is 3.5-4.5, the dilute acid solution is preferably acetic acid solution, and the solid-liquid mass ratio of basalt fiber to dilute acid solution is 1:4-5.
Step A2: mixing diethylenetriamine and deionized water, heating to 42-48 ℃ under nitrogen protection, mechanically stirring at 120-180rpm, slowly adding allyl glycidyl ether, controlling the total adding reaction time to be 1.2-1.6h, performing ring-opening reaction on the diethylenetriamine and the allyl glycidyl ether, and removing the deionized water by reduced pressure rotary evaporation after the reaction is finished to obtain a modifier;
further, the dosage ratio of diethylenetriamine, allyl glycidyl ether and deionized water was 0.1mol:0.2mol:45-55mL.
Step A3: diluting a modifier with an ethanol solution, adding a small amount of dimethylphenylphosphine for mixing, adding a coupling fiber, heating to 50-60 ℃ for reflux reaction for 1.5-2h, carrying out click reaction on mercapto grafted on the surface of the coupling fiber and double bonds in the modifier, introducing a large amount of imino structure modification to the surface of the coupling fiber, having good ageing resistance, simultaneously, remaining a small amount of double bonds, endowing the fiber and asphalt with crosslinking performance, taking out the fiber after the reaction is finished, cleaning and drying to obtain the modified fiber;
further, the dosage ratio of the coupling fiber, the modifier, the dimethylphenylphosphine and the ethanol solution is 100g:3.6-4.5g:40-50mg:400-450mL.
Step A4: feeding No. 110 asphalt, liquid styrene-butadiene rubber and FCC slurry oil, heating to 135-145 ℃ and banburying for 15-20min to obtain enveloping rubber, extruding and coating the enveloping rubber on the surface of modified fiber, cooling and cutting to obtain enveloping composite fiber;
further, the dosage ratio of the No. 110 asphalt, the liquid styrene-butadiene rubber and the FCC slurry oil is 100g:15-22g:35-40mL.
Further, the coating amount of the enveloping compound and the modified fiber is 2.7-3.3g/m, and the cutting length of the enveloping compound fiber is 10-15mm.
Further, the base asphalt is selected from 90# asphalt.
Further, the coarse aggregate is selected from continuous grading machine crushed stone with the fineness modulus of 2-16mm, and the fine aggregate is selected from natural river sand with the fineness modulus of 2.4-3.2.
The preparation method of the low-temperature modified asphalt concrete comprises the following specific operations: preheating matrix asphalt to 120+/-5 ℃, baking coarse aggregate, fine aggregate and mineral powder to 150+/-5 ℃, adding the preheated matrix asphalt, controlling the stirring speed to be 50rpm, hot-stirring, heating to 165+/-5 ℃, uniformly adding enveloping composite fibers, mixing, and discharging to obtain the low-temperature modified asphalt concrete.
The invention has the beneficial effects that:
the invention adopts enveloping compound fiber to improve the low temperature performance of asphalt concrete, basalt fiber is taken as a matrix, is treated by a silane coupling agent KH580, is grafted with organic groups containing sulfhydryl groups on the surface, takes diethylenetriamine and allyl glycidyl ether ring-opening reaction products as a modifier, introduces a large amount of imino structure modification to the surface of the fiber through the sulfhydryl clicking reaction with the surface of the coupled fiber, has good ageing resistance, simultaneously has a small amount of residual double bonds, imparts crosslinking performance to the fiber and asphalt, and forms a coating layer taking asphalt as a material on the surface of the fiber through extrusion coating; compared with the existing basalt fiber doped asphalt concrete, the asphalt concrete has the advantages that a large number of imino structures are introduced into the surface layer of the enveloping compound fiber, a good anti-aging effect can be exerted on the near layer of the cladding layer in the hot mixing service process of the asphalt concrete, the aging time of the cladding layer is delayed, the accurate anti-aging of the region is realized, the near layer of the fiber has good toughness and plasticity in the service process of the asphalt concrete, enveloping networks are formed by relatively soft and crisscrossed fibers, a good buffer effect is achieved by filling the enveloping networks between aggregates, and the cracking risk of the concrete is reduced; in addition, residual double bonds on the surface of the fiber can be crosslinked with asphalt and liquid styrene-butadiene rubber in a high-temperature environment, so that the bonding strength of the fiber and a coating layer is improved, the fiber is not easy to separate from asphalt cementing materials under the action of external pressure deformation or low-temperature internal stress, and the pivot connection function of basalt fiber is fully exerted.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The preparation method of the enveloping compound fiber comprises the following specific implementation processes:
step A1: preparing a dilute acid solution with the pH value of 4.5 by adopting acetic acid, taking basalt fiber coiled filaments provided by Zhejiang Dan Jin basalt fiber Co., ltd., wherein the diameter of the filaments is about 0.3mm, adopting the same raw materials, taking a silane coupling agent KH580 and an industrial grade reagent, discharging air from a reactor by using nitrogen, adding the silane coupling agent KH580 and the dilute acid solution for mixing, wherein the dosage ratio of the silane coupling agent KH580 is 8mL/100g based on the dosage of basalt fibers, and the solid-liquid mass ratio of the basalt fibers to the dilute acid solution is 1: and 4, adding basalt fibers, standing and soaking for 3 hours at room temperature, adding industrial ammonia water as alkali liquor, adjusting the pH of the soaking solution to be neutral, soaking for 12 hours again, taking out the fibers, leaching with water, and draining to obtain the coupling fibers.
Step A2: taking diethylenetriamine and deionized water, charging and mixing, introducing nitrogen for protection, heating to 42 ℃, applying 120rpm mechanical stirring, slowly adding allyl glycidyl ether at a constant speed within 30min, and continuing to perform heat preservation stirring reaction after the allyl glycidyl ether is completely added, wherein the total adding reaction time of the allyl glycidyl ether is controlled to be 1.6h, and the dosage ratio of the diethylenetriamine, the allyl glycidyl ether and the deionized water is 0.1mol:0.2mol:55mL, the reaction is finished, the deionized water is removed by reduced pressure rotary evaporation, and the modifier is prepared.
Step A3: preparing an ethanol solution with the volume concentration of 30%, stirring and diluting a modifier with the ethanol solution, adding a small amount of dimethylphenylphosphine for mixing, adding a coupling fiber, and heating to 50 ℃ for reflux reaction for 2 hours, wherein the dosage ratio of the coupling fiber to the modifier to the dimethylphenylphosphine to the ethanol solution is 100g:3.6g:40mg:450mL, taking out the fiber after the reaction, leaching with water, and drying in a nitrogen drying oven at 50 ℃ for 30min to obtain the modified fiber.
Step A4: mixing 110 # asphalt, liquid styrene-butadiene rubber (with the molecular weight of 50000) and FCC slurry oil, heating to 135 ℃ and banburying for 20min to obtain enveloping rubber, extruding and coating the enveloping rubber on the surface of modified fiber, wherein the dosage ratio of 110 # asphalt, liquid styrene-butadiene rubber and FCC slurry oil is 100g:22g: and (3) 35mL, wherein the coating amount of the enveloping compound on the modified fiber is 2.7g/m, and the enveloping compound fiber is prepared by cooling and cutting, and the cutting length is 10 mm.
Example 2
The preparation method of the enveloping compound fiber comprises the following specific implementation processes:
step A1: preparing a dilute acid solution with the pH value of 3.5 by adopting acetic acid, taking basalt fiber coiled filaments, taking a silane coupling agent KH580, discharging air from a reactor by using nitrogen, adding the silane coupling agent KH580 and the dilute acid solution for mixing, wherein the dosage proportion of the silane coupling agent KH580 is 12mL/100g based on the dosage of the basalt fiber, and the solid-liquid mass ratio of the basalt fiber to the dilute acid solution is 1: and 5, adding basalt fibers, standing and soaking for 2 hours at room temperature, adding industrial ammonia water as alkali liquor, adjusting the pH of the soaking solution to be neutral, soaking for 12 hours again, taking out the fibers, leaching with water, and draining to obtain the coupling fibers.
Step A2: taking diethylenetriamine and deionized water, charging and mixing, introducing nitrogen for protection, heating to 48 ℃, applying 120rpm mechanical stirring, slowly adding allyl glycidyl ether at a constant speed within 20min, and continuing to perform heat preservation stirring reaction after the allyl glycidyl ether is completely added, wherein the total adding reaction time of the allyl glycidyl ether is controlled to be 1.2h, and the dosage ratio of the diethylenetriamine, the allyl glycidyl ether and the deionized water is 0.1mol:0.2mol:45mL, the reaction is finished, the deionized water is removed by reduced pressure rotary evaporation, and the modifier is prepared.
Step A3: preparing an ethanol solution with the volume concentration of 30%, stirring and diluting a modifier with the ethanol solution, adding a small amount of dimethylphenylphosphine for mixing, adding a coupling fiber, and heating to 60 ℃ for reflux reaction for 1.5h, wherein the dosage ratio of the coupling fiber to the modifier to the dimethylphenylphosphine to the ethanol solution is 100g:4.5g:50mg:400mL, taking out the fiber after the reaction, leaching with water, and drying in a nitrogen drying oven at 50 ℃ for 30min to obtain the modified fiber.
Step A4: taking No. 110 asphalt, liquid styrene-butadiene rubber (with the molecular weight of 50000) and FCC slurry oil, and banburying the materials to 145 ℃ for 15min to obtain enveloping rubber, and extruding and coating the enveloping rubber on the surface of modified fiber, wherein the dosage ratio of the No. 110 asphalt, the liquid styrene-butadiene rubber and the FCC slurry oil is 100g:15g:40mL, wherein the coating amount of the enveloping compound on the modified fiber is 3.3g/m, and the enveloping compound fiber is prepared by cooling and cutting, and the cutting length is 12 mm.
Example 3
The preparation method of the enveloping compound fiber comprises the following specific implementation processes:
step A1: preparing a dilute acid solution with the pH value of 3.0 by adopting acetic acid, taking basalt fiber coiled filaments, taking a silane coupling agent KH580, discharging air from a reactor by using nitrogen, adding the silane coupling agent KH580 and the dilute acid solution for mixing, wherein the dosage proportion of the silane coupling agent KH580 is 10mL/100g based on the dosage of the basalt fiber, and the solid-liquid mass ratio of the basalt fiber to the dilute acid solution is 1: and 4, adding basalt fibers, standing and soaking for 2.5 hours at room temperature, adding industrial ammonia water as alkali liquor, adjusting the pH of the soaking solution to be neutral, soaking for 12 hours again, taking out the fibers, leaching with water, and draining to obtain the coupling fibers.
Step A2: taking diethylenetriamine and deionized water, charging and mixing, introducing nitrogen for protection, heating to 45 ℃, applying 180rpm mechanical stirring, slowly adding allyl glycidyl ether at a constant speed within 25min, and continuing to perform heat preservation stirring reaction after the allyl glycidyl ether is completely added, wherein the total adding reaction time of the allyl glycidyl ether is controlled to be 1.4h, and the dosage ratio of the diethylenetriamine, the allyl glycidyl ether and the deionized water is 0.1mol:0.2mol:50mL, and removing deionized water by reduced pressure rotary evaporation after the reaction is finished, thereby preparing the modifier.
Step A3: preparing an ethanol solution with the volume concentration of 30%, stirring and diluting a modifier with the ethanol solution, adding a small amount of dimethylphenylphosphine for mixing, adding a coupling fiber, and heating to 55 ℃ for reflux reaction for 1.7h, wherein the dosage ratio of the coupling fiber to the modifier to the dimethylphenylphosphine to the ethanol solution is 100g:4.2g:45mg:400mL, taking out the fiber after the reaction, leaching with water, and drying in a nitrogen drying oven at 50 ℃ for 30min to obtain the modified fiber.
Step A4: mixing 110 # asphalt, liquid styrene-butadiene rubber (with the molecular weight of 50000) and FCC slurry oil, heating to 140 ℃ and banburying for 18min to obtain enveloping rubber, extruding and coating the enveloping rubber on the surface of modified fiber, wherein the dosage ratio of 110 # asphalt, liquid styrene-butadiene rubber and FCC slurry oil is 100g:20g:40mL, wherein the coating amount of the enveloping compound on the modified fiber is 3.0g/m, and the enveloping compound fiber is prepared by cooling and cutting, and the cutting length is 15mm.
Example 4
The preparation method of the enveloping compound fiber comprises the following specific implementation processes:
step A1: preparing a dilute acid solution with the pH value of 3.5 by adopting acetic acid, taking basalt fiber coiled filaments, taking a silane coupling agent KH580, discharging air from a reactor by using nitrogen, adding the silane coupling agent KH580 and the dilute acid solution for mixing, wherein the dosage proportion of the silane coupling agent KH580 is 10mL/100g based on the dosage of the basalt fiber, and the solid-liquid mass ratio of the basalt fiber to the dilute acid solution is 1: and 5, adding basalt fibers, standing and soaking for 3 hours at room temperature, adding industrial ammonia water as alkali liquor, adjusting the pH of the soaking solution to be neutral, soaking for 12 hours again, taking out the fibers, leaching with water, and draining to obtain the coupling fibers.
Step A2: taking diethylenetriamine and deionized water, charging and mixing, introducing nitrogen for protection, heating to 48 ℃, applying 180rpm mechanical stirring, slowly adding allyl glycidyl ether at a constant speed within 30min, and continuing to perform heat preservation stirring reaction after the allyl glycidyl ether is completely added, wherein the total adding reaction time of the allyl glycidyl ether is controlled to be 1.5h, and the dosage ratio of the diethylenetriamine, the allyl glycidyl ether and the deionized water is 0.1mol:0.2mol:55mL, the reaction is finished, the deionized water is removed by reduced pressure rotary evaporation, and the modifier is prepared.
Step A3: preparing an ethanol solution with the volume concentration of 30%, stirring and diluting a modifier with the ethanol solution, adding a small amount of dimethylphenylphosphine for mixing, adding a coupling fiber, and heating to 60 ℃ for reflux reaction for 1.8h, wherein the dosage ratio of the coupling fiber to the modifier to the dimethylphenylphosphine to the ethanol solution is 100g:4.2g:40mg:450mL, taking out the fiber after the reaction, leaching with water, and drying in a nitrogen drying oven at 50 ℃ for 30min to obtain the modified fiber.
Step A4: mixing 110 # asphalt, liquid styrene-butadiene rubber (with the molecular weight of 50000) and FCC slurry oil, heating to 140 ℃ and banburying for 20min to obtain enveloping rubber, extruding and coating the enveloping rubber on the surface of modified fiber, wherein the dosage ratio of 110 # asphalt, liquid styrene-butadiene rubber and FCC slurry oil is 100g:20g:40mL, wherein the coating amount of the enveloping compound on the modified fiber is 3.1g/m, and the enveloping compound fiber is prepared by cooling and cutting, and the cutting length is 15mm.
The following examples apply the enveloping compound fibers prepared as above to asphalt concrete, with the following specific raw materials:
the matrix asphalt is selected from Donghai grade A No. 90 asphalt provided by the China patent and honest petrochemical industry Co., ltd;
coarse aggregate is selected from continuous grading machine-made gravels with the diameter of 2-16mm, the material is mainly diabase, and the concrete grading is shown in table 1:
TABLE 1
| Mesh size/mm | 18.5 | 16.0 | 13.2 | 9.5 | 4.75 | 2.36 | 0.7 |
| By percentage/% | 100 | 100 | 72.5 | 50.4 | 13.2 | 1.6 | 0 |
Fine aggregate selected from natural river sand with fineness modulus of 2.4-3.2, and mainly made of quartz sand;
and the mineral powder is selected from S95 grade limestone mineral powder.
The specific operation for preparing the low-temperature modified asphalt concrete is as follows: preheating matrix asphalt to 120+/-5 ℃, baking coarse aggregate, fine aggregate and mineral powder to 150+/-5 ℃, adding the preheated matrix asphalt, controlling the stirring speed to be 50rpm, hot-stirring, heating to 165+/-5 ℃, uniformly adding enveloping composite fibers, mixing, and discharging to obtain the low-temperature modified asphalt concrete.
The specific ingredients in parts by weight are shown in Table 2:
TABLE 2
To verify the effect of the enveloping compound fibers in the present invention, a set of comparative examples was set, the procedure was the same as in example 6, 8 parts of enveloping compound fibers were replaced with 10 parts of basalt fibers without enveloping compound, and cut to the same specification, and the rest were identical.
Pouring the prepared asphalt concrete into a mould with the specification of 50 multiplied by 20cm, compacting under 5.5MPa, naturally curing for 7 days, sampling according to JTJ 052-2000 (Highway engineering asphalt and asphalt mixture test procedure), and performing Marshall test, rutting test, low-temperature cleavage test and freeze thawing cleavage test, wherein specific test data are shown in Table 3:
TABLE 3 Table 3
As can be seen from the data in Table 3, the stability of the asphalt concrete prepared by the invention after casting molding is 12.83-14.02kN, the mean value of dynamic stability is 4553-4815 times/mm, which is far higher than the standard of highway asphalt concrete and slightly higher than the existing fiber modified asphalt concrete; the breaking load after freezing and thawing is 8.79-9.15kN, the freezing and thawing splitting strength ratio is 89.8-93.3%, which is far higher than the existing fiber modified asphalt concrete, and the fiber modified asphalt concrete has good low-temperature stability.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.
Claims (9)
1. The low-temperature modified asphalt concrete is characterized by comprising the following components in parts by weight: 4.4-5.1 parts of matrix asphalt, 58-65 parts of coarse aggregate, 22-30 parts of fine aggregate, 4-6 parts of mineral powder and 6-10 parts of envelope composite fiber;
the enveloped composite fiber is prepared by the following method:
step A1: mixing a silane coupling agent KH580 and a dilute acid solution under the protection of nitrogen, adding basalt fibers, standing at room temperature, soaking for 2-3h, adding an alkaline solution to adjust pH to be neutral, soaking for 12h again, taking out the fibers, cleaning and draining to obtain coupled fibers;
step A2: mixing diethylenetriamine and deionized water, heating to 42-48 ℃ under nitrogen protection, stirring, slowly adding allyl glycidyl ether, controlling the total adding reaction time to be 1.2-1.6h, and removing deionized water by reduced pressure rotary evaporation after the reaction is finished to obtain a modifier;
step A3: diluting the modifier with ethanol solution, adding dimethyl phenyl phosphine for mixing, adding coupling fiber, heating to 50-60 ℃ for reflux reaction for 1.5-2h, taking out the fiber after the reaction is finished, cleaning and drying to obtain modified fiber;
step A4: feeding No. 110 asphalt, liquid styrene-butadiene rubber and FCC slurry oil, heating to 135-145 ℃ for banburying for 15-20min, adding peroxide crosslinking agent from a feeding port for mixing to obtain enveloping rubber, extruding and coating the enveloping rubber on the surface of modified fiber, cooling and cutting to obtain enveloping composite fiber.
2. The low temperature modified asphalt concrete according to claim 1, wherein the dosage ratio of basalt fiber to silane coupling agent KH580 is 100g:8-12mL, and the pH value of the diluted acid solution is 3.5-4.5.
3. The low temperature modified asphalt concrete according to claim 1, wherein the dosage ratio of diethylenetriamine, allyl glycidyl ether and deionized water is 0.1mol:0.2mol:45-55mL.
4. A low temperature modified asphalt concrete according to claim 3, wherein the coupling fiber, modifier, dimethylphenylphosphine and ethanol solution are used in an amount ratio of 100g:3.6-4.5g:40-50mg:400-450mL.
5. The low temperature modified asphalt concrete according to claim 4, wherein the amount ratio of the 110 # asphalt, the liquid styrene-butadiene rubber, the FCC slurry oil and the peroxide crosslinking agent is 100g:15-22g:35-40mL:0.2-0.25g.
6. The low temperature modified asphalt concrete according to claim 5, wherein the coating amount of the enveloping compound and the modified fibers is 2.7-3.3g/m, and the cutting length of the enveloping compound fibers is 10-15mm.
7. The low temperature modified asphalt concrete of claim 1, wherein the base asphalt is 90# asphalt.
8. The low-temperature modified asphalt concrete according to claim 1, wherein the coarse aggregate is crushed stone of a continuous grading machine with the fineness modulus of 2-16mm, and the fine aggregate is natural river sand with the fineness modulus of 2.4-3.2.
9. The method for preparing the low-temperature modified asphalt concrete according to claim 1, which is characterized by comprising the following steps: preheating matrix asphalt to 120+/-5 ℃, baking coarse aggregate, fine aggregate and mineral powder to 150+/-5 ℃, adding the preheated matrix asphalt, controlling the stirring speed to be 50rpm, hot-stirring, heating to 165+/-5 ℃, uniformly adding enveloping composite fibers, mixing, and discharging to obtain the low-temperature modified asphalt concrete.
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| KR101612491B1 (en) * | 2015-09-23 | 2016-04-14 | (주)에스엔건설 | Durability enhancement method of asphalt pavement by using Basalt fiber grids |
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| CN115716725A (en) * | 2022-11-15 | 2023-02-28 | 昆明姜雨科技有限公司 | Anti-crack asphalt mixture and preparation method thereof |
| CN116102290A (en) * | 2023-04-11 | 2023-05-12 | 河北伦特化工集团有限公司 | Water permeable asphalt additive and preparation method thereof |
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| CN100999890A (en) * | 2006-12-30 | 2007-07-18 | 马银华 | Road surface structure of felexiable fibre emulsifying asphalt stable material as base and construction method thereof |
| KR101612491B1 (en) * | 2015-09-23 | 2016-04-14 | (주)에스엔건설 | Durability enhancement method of asphalt pavement by using Basalt fiber grids |
| CN106587735A (en) * | 2016-11-17 | 2017-04-26 | 长安大学 | Isophthalic unsaturated polyester resin modified asphalt concrete and preparation method thereof |
| CN109824289A (en) * | 2019-03-28 | 2019-05-31 | 北京华建盛和科技发展有限公司 | A kind of bituminous concrete high-modulus modifier and its preparation method and application |
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