CN112227139A - Coal gangue asphalt mixture - Google Patents
Coal gangue asphalt mixture Download PDFInfo
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- CN112227139A CN112227139A CN202011146940.3A CN202011146940A CN112227139A CN 112227139 A CN112227139 A CN 112227139A CN 202011146940 A CN202011146940 A CN 202011146940A CN 112227139 A CN112227139 A CN 112227139A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1054—Preparing mixtures of which at least part of the solid ingredients has previously been deposited on the surface, excluding penetrating or surface dressing, e.g. in situ mixing, mixing involving lifting of spread or windrowed aggregate
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Abstract
The invention discloses a coal gangue asphalt mixture, which relates to the technical field of road asphalt materials, and comprises modified coal gangue microparticles, asphalt, broken stone and river sand, wherein the mass ratio of the modified coal gangue microparticles to the asphalt is (1.8-2): 1, the modified coal gangue micro-particles are used as additives to improve the water stability and high-temperature stability of the asphalt, comprehensively improve the comprehensive performance of the asphalt and fully ensure the service performance and driving safety of the asphalt pavement.
Description
Technical Field
The invention relates to the technical field of road asphalt materials, in particular to a coal gangue asphalt mixture.
Background
The coal gangue is a solid waste discharged in the coal mining process and the coal washing processThe coal-forming process also includes the excavation gangue in the course of tunnel excavation, the gangue mined from the top plate, bottom plate and interlayer in the course of excavation and the washing gangue mined in the course of coal washing, and its main component is Al2O3、SiO2And in addition, Fe in different quantities2O3、CaO、MgO、Na2O、K2O、P2O5、SO3And trace rare elements. The long-term mass accumulation of the coal gangue. Not only occupies precious land resources, but also pollutes air, endangers water and soil, and seriously influences the physical health of residents in mining areas.
With the vigorous development of highway transportation industry, asphalt pavement has become the main form of high-grade highway pavement in China. The asphalt pavement bears the repeated action of vehicle load and the direct influence of natural environment for a long time, so that the diseases such as high-temperature rutting, low-temperature cracking, fatigue and the like are frequently caused, and the damage mechanism is complex and various, so that the service life of the asphalt pavement is shortened, and the maintenance cost is increased. However, the durability of asphalt can be improved by adding inorganic filler such as coal gangue filler into matrix asphalt or matrix asphalt mixture and melting or dispersing the modified material in the matrix asphalt through proper processing technology, but in terms of engineering property, coal gangue is relatively poorer than common macadam soil and has the characteristic of poorer water stability, and the coal gangue mainly reacts on the strength condition and deformability and has stronger sensitivity to water content. The application of the waste coal gangue to the asphalt pavement has important significance for the resource utilization of wastes, and the development of a novel coal gangue asphalt mixture with high-temperature stability, low-temperature crack resistance and water stability is urgent.
Disclosure of Invention
In view of the above, the invention aims to provide a coal gangue asphalt mixture, which takes coal gangue as an additive to improve the water stability and high-temperature stability of asphalt, comprehensively improve the comprehensive performance of asphalt, and fully ensure the service performance and driving safety of asphalt pavement.
The invention solves the technical problems by the following technical means:
a coal gangue asphalt mixture comprises the following raw materials: the modified coal gangue micro-particles, asphalt, broken stone and river sand, wherein the mass ratio of the modified coal gangue micro-particles to the asphalt is (1.8-2): 1; the preparation method of the coal gangue asphalt mixture comprises the following steps:
(1) placing the coal gangue micro-particles which are placed for more than one year in a furnace with the temperature of 760 plus 800 ℃ for calcining for 40-50min, taking out and cooling to room temperature, then placing the coal gangue micro-particles into a mixed solution of 35 wt% methanol solution and Tween-20, stirring for 1-2h, taking out and cleaning, and then air-drying to obtain activated coal gangue micro-particles;
(2) mixing activated coal gangue microparticles with gelatin powder, putting into a sol reaction device with deionized water, heating and stirring uniformly to form gel a, crushing the gel to obtain gel particles a, mixing tetraethoxysilane with absolute ethyl alcohol, adding a hydrochloric acid solution, stirring for 10min, adding the gel particles a and 1-ethyl-3-methylimidazole acetate, and continuously stirring for 30-40min to obtain sol b;
(3) standing the sol b in a sealed environment at 40-50 ℃ for 8-12h, continuously heating to 90-110 ℃, standing for 1-2h, taking out, pouring into polyglycerol ester, stirring at 70 ℃ for 1-2h at a high speed, taking out, and cleaning to obtain modified coal gangue microparticles;
(4) heating the asphalt to 120-130 ℃, adding the modified coal gangue microparticles, river sand and crushed stone which are heated to 100-110 ℃, and uniformly stirring to obtain the coal gangue asphalt mixture.
The carbon content of the coal gangue microparticles is reduced after high-temperature treatment, meanwhile, the multi-gap structure state of the coal gangue is changed under the action of methanol and Tween-20, a new activation center is formed, the activated coal gangue microparticles and gelatin form gel particles, the gel particles are mixed with sol formed by ethyl orthosilicate, the permeability and the stability of the sol are utilized to cooperate with the gelatin to modify and stabilize the pore structure during the reaction of the coal gangue microparticles, the reaction of 1-ethyl-3-methylimidazole acetate and the activated coal gangue microparticles is promoted, the strength, the water stability and the high-temperature stability of the coal gangue microparticles are improved, and the shear strength and the bearing strength of the coal gangue microparticles are further improved. Under the action of high-speed stirring at 70 ℃, the sol system is broken up, the coal gangue microparticles react with the polyglycerol ester, the dispersibility of the coal gangue microparticles is improved, and the coal gangue microparticles are easily and uniformly mixed with asphalt with higher viscosity.
Further, the particle size of the crushed stone is 4.5-5.5mm, the particle size of the river sand is 0.075-0.080mm, and the mass ratio of the asphalt to the crushed stone to the river sand is 1: 9: 8.
further, the asphalt is selected from one of road petroleum asphalt, coal asphalt and SBR modified asphalt.
Further, the particle size of the modified coal gangue microparticles is 3-5.5 mm.
Further, the mass ratio of the methanol solution to the tween-20 is 1: 0.05.
further, the mass ratio of the activated coal gangue microparticles to the gelatin powder is 1: 0.4; the mass ratio of the gel particles a to the tetraethoxysilane is 1: 0.5, the mass ratio of the activated coal gangue microparticles to the 1-ethyl-3-methylimidazole acetate is 1: 0.2.
furthermore, the coal gangue asphalt mixture is used for paving roads, and is particularly suitable for the roads through which heavy-duty automobiles pass.
The sol reaction device comprises a reaction kettle and a stirrer arranged in the reaction kettle, wherein a charging hole and a thermometer are arranged at the top of the reaction kettle, a discharging hole is formed in the bottom of the reaction kettle, a sealing cover plate is arranged on the discharging hole, a heater is arranged in the reaction kettle, the stirrer comprises a motor, a stirring shaft and a stirring wheel, the motor is arranged in the center of the top of the reaction kettle, one end of the stirring shaft is connected with a rotating shaft of the motor, the other end of the stirring shaft is embedded into the reaction kettle, the stirring wheel is arranged on the stirring shaft, the upper end of the stirring wheel is of a gradually-changed structure protruding towards the center from the periphery, a mounting hole is formed in the center of the shaft of the stirring wheel, and the stirring wheel is arranged on the stirring shaft in an interference fit manner with the stirring; be equipped with a plurality of netted baffles perpendicularly on the convex surface of stirring wheel, a plurality of netted baffles all set up along the diameter direction of stirring wheel, and netted baffle is the right angled triangle structure, and the hypotenuse of right angled triangle structure is fixed on the stirring wheel, and the bottom surface of stirring wheel is provided with a plurality of wavy stirring leaves, and wavy stirring leaf place plane is perpendicular with the bottom surface of stirring wheel, and the crisscross crushing tooth that is provided with about the wavy stirring leaf.
The sol reaction device utilizes a rotating stirring wheel to apply centrifugal force to the coal gangue microparticles and the gelatin powder, the coal gangue microparticles and the gelatin powder generate centrifugal motion under the action of the centrifugal force and collide with the inner wall of the reaction kettle, so that uniform mixing of the coal gangue microparticles and the gelatin powder is facilitated, and deionized water is mixed to form uniform gel a. And then accelerating the rotation speed of a motor by adjusting, fully cutting and colliding the gel a by utilizing a net-shaped clapboard and a wavy stirring blade, crushing the gel a into gel particles a, then reducing the rotation speed, sequentially adding tetraethoxysilane, hydrochloric acid solution of absolute ethyl alcohol and 1-ethyl-3-methylimidazole acetate for reaction, and continuously stirring for reaction to generate sol b. The sol reaction device can realize the dual-purpose purposes of stirring and crushing, the mesh-shaped partition plate and the wavy stirring blades can play a role in efficient stirring at low speed, the gel a can be sufficiently and effectively crushed at high speed, and the crushing efficiency and quality are improved.
Further, be provided with circular baffling board on reation kettle's the inside wall, the upper end of circular baffling board is personally submitted by the gradual change structure of sinking to the center all around, and the axle center of circular baffling board is equipped with the opening, and the stirring wheel is equipped with a plurality ofly, all is provided with circular baffling board between two arbitrary adjacent stirring wheels. Firstly, the added coal gangue microparticles and gelatin powder are fully mixed under the centrifugal force action of the uppermost layer of the stirring wheel, and are dispersed in deionized water, and then are mixed and dispersed step by step, so that the formed gel a is more uniform; secondly, a plurality of stirring wheels can carry out quick abundant crushing to the gel a that forms, further improves crushing efficiency and quality.
Further, the middle part of sealing the apron is provided with sealed boss, be provided with the locating plate on four angles of sealing the apron respectively, the locating plate is installed perpendicularly on the upper and lower both ends of sealing the apron, the upper and lower both ends of drain hole are provided with the location arch respectively, the protruding rotation in location of the upper end of drain hole is connected between two locating plates of the upper end of sealing the apron, be provided with the through-hole on the location arch of the lower extreme of drain hole, be equipped with on two locating plates of the lower extreme of sealing the apron with through-hole assorted locking hole, be provided with the connecting link on one of them locating plate of the lower extreme of sealing the apron, be provided with the locking bolt on the free end of connecting link, when sealing apron lid closed on. The sealing cover plate is hinged to the discharging hole, the sealing cover plate can be rapidly and stably fixed on the discharging hole through the matching of the locking bolt, the through hole and the locking hole, the structure is simple, the use is convenient, the positioning protrusion can play a good sealing effect, and the leakage in the gel reaction process is prevented.
In addition, the elastic rubber layer is arranged on the surface of the positioning bulge, so that the sealing effect can be further improved.
Has the advantages that:
1. after the modified coal gangue microparticles are added into the asphalt mixture, the flow value is smaller, the stability reaches more than 18kN, and the dynamic stability reaches more than 10000 times/mm, so that the integral deformation degree is smaller, the strength is higher, the high-temperature performance is good, the residual stability reaches more than 95%, the water stability is high, the water damage resistance is stronger, the low-temperature bending failure strain is higher, the low-temperature flexibility is good, the crack resistance is excellent, the comprehensive performance of the asphalt is improved, the safety of use after the asphalt pavement is made is fully guaranteed, and the service life is prolonged.
2. The sol reaction device can realize the purposes of stirring and crushing, the mesh clapboard and the wavy stirring blades can play a role of efficient stirring at low speed, the gel can be fully and effectively crushed at high speed, the crushing efficiency and quality are improved, and the reaction is carried out in the same equipment, so that the phenomenon that reactants contact with air due to troublesome operation and excessive transfer steps is avoided.
3. The device has simple structure, convenient use and high safety, and is suitable for popularization and application.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of the present invention;
FIG. 3 is a first schematic structural view of a stirring wheel according to the present invention;
FIG. 4 is a second schematic structural view of a stirring wheel according to the present invention;
FIG. 5 is a schematic view of a circular baffle of the present invention;
FIG. 6 is a first schematic view of the structure of the round discharge hole and the sealing cover plate of the present invention;
FIG. 7 is a schematic structural view of a circular discharge hole and a sealing cover plate of the present invention;
the device comprises a reaction kettle 1, a stirrer 2, a feed inlet 3, a thermometer 4, a discharge hole 5, a sealing cover plate 6, a heater 7, a motor 201, a stirring shaft 202, a stirring wheel 203, a mounting hole 8, a reticular partition plate 9, a wavy stirring blade 10, crushing teeth 11, a circular baffle plate 12, a circulation hole 13, a sealing boss 14, a positioning plate 15, a positioning bulge 16, a through hole 17, a locking hole 18, a connecting chain 19 and a locking bolt 20.
Detailed Description
The present invention will be described in detail with reference to examples below:
example 1: sol reaction device
As shown in fig. 1-7, the sol reaction device includes a reaction kettle 1 and a stirrer 2 installed in the reaction kettle 1, the top of the reaction kettle 1 is provided with a charging port 3 and a thermometer 4, the bottom of the reaction kettle 1 is provided with a discharging port 5, the discharging port 5 is provided with a sealing cover plate 6, the reaction kettle 1 is internally provided with a heater 7, the stirrer 2 includes a motor 201, a stirring shaft 202 and a stirring wheel 203, the motor 201 is installed at the center position of the top of the reaction kettle 1, one end of the stirring shaft 202 is connected with a rotating shaft of the motor 201, the other end of the stirring shaft 202 is embedded into the reaction kettle 1, the stirring wheel 203 is installed on the stirring shaft 202, the upper end of the stirring wheel 203 is of a gradually-changed structure protruding from the periphery to the center, the axial center of the stirring wheel 203 is provided with an installation hole 8, and the stirring wheel 203 is installed; perpendicular on the convex surface of stirring wheel 203 is equipped with a plurality of netted baffles 9, a plurality of netted baffles 9 all set up along the diameter direction of stirring wheel 203, netted baffle 9 is the right triangle structure, the hypotenuse of right triangle structure is fixed on stirring wheel 203, the bottom surface of stirring wheel 203 is provided with a plurality of wavy stirring leaves 10, wavy stirring leaf 10 place plane is perpendicular with the bottom surface of stirring wheel 203, wavy stirring leaf 10 is crisscross from top to bottom and is provided with crushing tooth 11.
The inner side wall of the reaction kettle 1 is provided with a circular baffle plate 12, the upper end face of the circular baffle plate 12 is of a gradually-changed structure which is sunken from the periphery to the center, the axial center of the circular baffle plate 12 is provided with a plurality of circulation holes 13, and the circular baffle plates 12 are arranged between any two adjacent stirring wheels 203.
The middle part of the sealing cover plate 6 is provided with a sealing boss 14, four corners of the sealing cover plate 6 are respectively provided with a positioning plate 15, the positioning plates 15 are vertically arranged on the upper end and the lower end of the sealing cover plate 6, the upper end and the lower end of the discharging opening 5 are respectively provided with a positioning bulge 16, the positioning bulge 16 on the upper end of the discharging opening 6 is rotatably connected between the two positioning plates 15 on the upper end of the sealing cover plate 6, the positioning bulge 16 on the lower end of the discharging opening 6 is provided with a through hole 17, the two positioning plates 15 on the lower end of the sealing cover plate 6 are provided with locking holes 18 matched with the through hole 17, one of the positioning plates 15 on the lower end of the sealing cover plate 6 is provided with a connecting chain 19, the free end of the connecting chain 19 is provided with a locking bolt 20, when the.
The sol reaction device utilizes the rotary stirring wheel 203 to apply centrifugal force to the coal gangue microparticles and the gelatin powder, the coal gangue microparticles and the gelatin powder generate centrifugal motion under the action of the centrifugal force and collide with the inner wall of the reaction kettle 1, so that uniform mixing of the coal gangue microparticles and the gelatin powder is facilitated, and deionized water is mixed to form uniform gel a. Then, the rotating speed of the motor 201 is increased by adjusting, the gel a is fully cut and collided by utilizing the reticular clapboard 9 and the wavy stirring blades 10, the gel a is crushed into gel particles a, then the rotating speed is reduced, the hydrochloric acid solution of tetraethoxysilane and absolute ethyl alcohol and 1-ethyl-3-methylimidazole acetate are respectively added, and then the stirring reaction is continued to generate sol b. The sol reaction device can realize the dual-purpose purposes of stirring and crushing, the mesh-shaped partition plate 9 and the wavy stirring blades 10 can play a role in efficient stirring at low speed, the gel a can be fully and effectively crushed at high speed, and the crushing efficiency and quality are improved.
Example 2: coal gangue asphalt mixture I
Weighing the following raw materials in parts by weight:
200g of modified coal gangue microparticles, 100g of coal tar pitch, 900g of crushed stone with the diameter of 4.5-5.5mm and 800g of river sand with the diameter of 0.075-0.080 mm.
The preparation method of the modified coal gangue microparticles comprises the following steps:
(1) crushing the coal gangue left for about two years into microparticles with the particle size of about 3-3.5mm, weighing 300g, calcining in a furnace at 760 ℃ for 50min, taking out, cooling to room temperature, putting the coal gangue microparticles into a mixed solution of 500g of 35 wt% methanol solution and 25g of tween-20, stirring for 2h, taking out, cleaning with clear water, and air-drying to obtain activated coal gangue microparticles with the mass of about 291g and the mass loss of about 3.0%;
(2) mixing activated coal gangue microparticles with 116.4g of gelatin powder, putting the mixture into the sol reaction device of example 1 with deionized water, heating and stirring the mixture uniformly, cooling the mixture to form gel a, crushing the gel into gel particles a of 1-2cm, wherein the gel particles a are about 1105g, mixing 552.5g of tetraethoxysilane with absolute ethyl alcohol, and adding 0.1mol/L hydrochloric acid solution, wherein the molar ratio of tetraethoxysilane to absolute ethyl alcohol to water to catalyst is 1: 3.8: 6.4: 0.01, stirring at normal temperature for 10min, adding the gel particles a and 58.2g of 1-ethyl-3-methylimidazole acetate, and continuously stirring for 30min to obtain sol b;
(3) and (3) standing the sol b in a closed environment at 50 ℃ for 8h, continuously heating to 110 ℃, standing for 1h, taking out, pouring into polyglycerol ester, and mixing the polyglycerol ester with the sol b according to the ratio of 1: 1, stirring at the temperature of 70 ℃ and at the speed of 1000rpm for 2h, taking out, cleaning with sodium hydroxide solution by adopting ultrasonic waves, and then air-drying to obtain the modified coal gangue microparticles.
Heating coal tar pitch to 120 ℃, adding the modified coal gangue microparticles heated to 110 ℃, river sand and crushed stone, and uniformly stirring to obtain the coal gangue pitch mixture.
Example 3: gangue asphalt mixture II
Weighing the following raw materials in parts by weight:
180g of modified coal gangue microparticles, 100g of road petroleum asphalt, 900g of 4.5-5.5mm broken stone and 800g of 0.075-0.080mm river sand.
The preparation method of the modified coal gangue microparticles comprises the following steps:
(1) crushing the coal gangue left for about two years into microparticles with the particle size of about 3-3.5mm, weighing 400g, calcining in a furnace at 800 ℃ for 40min, taking out, cooling to room temperature, putting the coal gangue microparticles into a mixed solution of 600g of 35 wt% methanol solution and 30g of tween-20, stirring for 1h, taking out, cleaning with clear water, and air-drying to obtain activated coal gangue microparticles with the mass of about 388.4g and the mass loss of about 2.9%;
(2) mixing activated coal gangue microparticles with 155.36g of gelatin powder, putting the mixture into the sol reaction device of example 1 with deionized water, heating and stirring the mixture uniformly, cooling the mixture to form gel a, crushing the gel into gel particles a with the particle size of 1-2cm, wherein the gel particles a are about 1476g, mixing 738g of tetraethoxysilane with absolute ethyl alcohol, and adding 0.1mol/L hydrochloric acid solution, wherein the molar ratio of the tetraethoxysilane to the absolute ethyl alcohol to the water to the catalyst is 1: 3.8: 6.4: 0.01, stirring at normal temperature for 10min, adding the gel particles a and 77.68g of 1-ethyl-3-methylimidazole acetate, and continuously stirring for 40min to obtain sol b;
(3) and (3) standing the sol b in a sealed environment at 40 ℃ for 12h, continuously heating to 90 ℃, standing for 2h, taking out, pouring into polyglycerol ester, and mixing the polyglycerol ester with the sol b according to the ratio of 1: 1, stirring at the temperature of 70 ℃ and at the speed of 900-1000rpm for 1h, taking out, cleaning with sodium hydroxide solution by adopting ultrasonic waves, and then air-drying to obtain the modified coal gangue microparticles.
Heating road petroleum asphalt to 130 ℃, adding the modified coal gangue microparticles heated to 100 ℃, river sand and crushed stone, and uniformly stirring to obtain a coal gangue asphalt mixture.
Example 4: gangue asphalt mixture III
Weighing the following raw materials in parts by weight:
190g of modified coal gangue micro-particles, 100g of SBR modified asphalt, 900g of 4.5-5.5mm crushed stone and 800g of 0.075-0.080mm river sand.
The preparation method of the modified coal gangue microparticles comprises the following steps:
(1) crushing the coal gangue left for about two years into microparticles with the particle size of about 3-3.5mm, weighing 350g, calcining in a furnace at 780 ℃ for 45min, taking out, cooling to room temperature, putting the coal gangue microparticles into a mixed solution of 550g of 35 wt% methanol solution and 27.5g of tween-20, stirring for 1.5h, taking out, cleaning with clear water, and air-drying to obtain activated coal gangue microparticles with the mass of about 340.6g and the mass loss of about 2.7%;
(2) mixing activated coal gangue microparticles with 136.24g of gelatin powder, putting the mixture into the sol reaction device of example 1 with deionized water, heating and stirring the mixture uniformly, cooling the mixture to form gel a, crushing the gel into gel particles a with the particle size of 1-2cm and the particle size of about 1294g, mixing 647g of tetraethoxysilane with absolute ethyl alcohol, and adding 0.1mol/L hydrochloric acid solution, wherein the molar ratio of tetraethoxysilane, absolute ethyl alcohol, water and catalyst is 1: 3.8: 6.4: 0.01, stirring at normal temperature for 10min, adding the gel particles a and 68.12g of 1-ethyl-3-methylimidazole acetate, and continuously stirring for 35min to obtain sol b;
(3) and (3) standing the sol b in a sealed environment at the temperature of 45 ℃ for 10h, continuously heating to 100 ℃, standing for 1.5h, taking out, pouring into polyglycerol ester, and mixing the polyglycerol ester with the sol b according to the ratio of 1: 1, stirring at the temperature of 70 ℃ and at the speed of 900-1000rpm for 1.5h, taking out, cleaning with sodium hydroxide solution by adopting ultrasonic waves, and then air-drying to obtain the modified coal gangue microparticles.
Heating SBR modified asphalt to 125 ℃, adding the modified coal gangue microparticles heated to 105 ℃, river sand and crushed stone, and uniformly stirring to obtain a coal gangue asphalt mixture.
Comparative example 1:
200g of coal gangue particles with the particle size of about 3-3.5mm, 100g of coal tar pitch, 900g of crushed stone with the particle size of 4.5-5.5mm and 800g of river sand with the particle size of 0.075-0.080mm are prepared into the coal gangue pitch mixture in the mode of example 1.
Comparative example 2:
100g of coal tar pitch, 1000g of crushed stone with the particle size of 4.5-5.5mm and 900g of river sand with the particle size of 0.075-0.080mm are prepared into the coal gangue pitch mixture in the mode of example 1.
The coal gangue asphalt mixture prepared according to the preparation methods of the examples 2-4 and the comparative examples 1-2 is subjected to a Marshall test and a Marshall soaking test, and the obtained results are shown in the following table 1 according to the standard requirements:
TABLE 1
As is clear from Table 1, the Marshall stability of the coal gangue asphalt mixtures prepared in examples 2 to 4 was improved and the fluidity value was reduced, indicating that the coal gangue asphalt mixtures prepared in examples 2 to 4 had a smaller degree of deformation. And the coal gangue asphalt mixture prepared in the examples 2-4 has higher residual stability, which shows that the coal gangue asphalt mixture prepared in the examples 2-4 has high water stability and strong water damage resistance, and effectively solves the problem of poor water stability when the coal gangue is added into asphalt.
The coal gangue asphalt mixture prepared according to the preparation methods of the examples 2-4 and the comparative examples 1-2 is subjected to a rutting test and a low-temperature trabecular bending test (-10 ℃), and the obtained data are shown in Table 2:
TABLE 2
| Examples | Dynamic stability degree/(degree/mm) | Low temperature bending failure strain/. mu.epsilon |
| Example 2 | 1202037 | 3020.4 |
| Example 3 | 1201203 | 2994.5 |
| Example 4 | 120378 | 3143.7 |
| Comparative example 1 | 8856 | 2792.8 |
| Comparative example 2 | 79203 | 2698.6 |
As can be seen from Table 2, the coal gangue asphalt mixtures prepared in examples 2 to 4 have high Marshall dynamic stability, long service life at high temperature and small deformation rate, which indicates that the coal gangue asphalt mixtures prepared in examples 2 to 4 have high temperature. And the coal gangue asphalt mixture prepared in the examples 2 to 4 has larger low-temperature bending failure strain, which shows that the coal gangue asphalt mixture prepared in the examples 2 to 4 has good low-temperature flexibility and excellent crack resistance.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (10)
1. The coal gangue asphalt mixture is characterized by comprising the following raw materials: the modified coal gangue micro-particles are prepared from modified coal gangue micro-particles, asphalt, broken stone and river sand, wherein the mass ratio of the modified coal gangue micro-particles to the asphalt is (1.8-2): 1, the preparation method of the coal gangue asphalt mixture comprises the following steps:
(1) placing the coal gangue micro-particles which are placed for more than one year in a furnace with the temperature of 760 plus 800 ℃ for calcining for 40-50min, taking out and cooling to room temperature, then placing the coal gangue micro-particles into a mixed solution of 35 wt% methanol solution and Tween-20, stirring for 1-2h, taking out and cleaning, and then air-drying to obtain activated coal gangue micro-particles;
(2) mixing activated coal gangue microparticles with gelatin powder, putting into a sol reaction device with deionized water, heating and stirring uniformly to form gel a, crushing the gel to obtain gel particles a, mixing tetraethoxysilane with absolute ethyl alcohol, adding a hydrochloric acid solution, stirring for 10min, adding the gel particles a and 1-ethyl-3-methylimidazole acetate, and continuing stirring for 30-40min to obtain sol b;
(3) standing the sol b in a sealed environment at 40-50 ℃ for 8-12h, continuously heating to 90-110 ℃, standing for 1-2h, taking out, pouring into polyglycerol ester, stirring at 70 ℃ for 1-2h at a high speed, taking out, and cleaning to obtain modified coal gangue microparticles;
(4) heating the asphalt to 120-130 ℃, adding the modified coal gangue microparticles, river sand and crushed stone which are heated to 100-110 ℃, and uniformly stirring to obtain the coal gangue asphalt mixture.
2. The coal gangue asphalt mixture as claimed in claim 1, wherein the particle size of the crushed stone is 4.5-5.5mm, the particle size of the river sand is 0.075-0.080mm, and the mass ratio of the asphalt to the crushed stone to the river sand is 1: 9: 8.
3. the coal gangue asphalt mixture as defined in claim 2, wherein the asphalt is selected from one of road petroleum asphalt, coal asphalt, and SBR modified asphalt.
4. The coal gangue asphalt mixture as claimed in claim 3, wherein the particle size of the modified coal gangue fine particles is 3-5.5 mm.
5. The coal gangue asphalt mixture as claimed in claim 4, wherein the mass ratio of the methanol solution to tween-20 is 1: 0.05.
6. the coal gangue asphalt mixture as claimed in claim 5, wherein the mass ratio of the activated coal gangue microparticles to the gelatin powder is 1: 0.4; the mass ratio of the gel particles a to the tetraethoxysilane is 1: 0.5, the mass ratio of the activated coal gangue microparticles to the 1-ethyl-3-methylimidazole acetate is 1: 0.2.
7. the coal gangue asphalt mixture as defined in any one of claims 1 to 6, wherein the coal gangue asphalt mixture is used for road paving.
8. The coal gangue asphalt mixture as defined in claim 1, wherein the sol reaction device comprises a reaction kettle and a stirrer arranged in the reaction kettle, the top of the reaction kettle is provided with a feed inlet and a temperature instrument, the bottom of the reaction kettle is provided with a discharge hole, the discharging port is provided with a sealing cover plate, the reaction kettle is internally provided with a heater, the stirrer comprises a motor, a stirring shaft and a stirring wheel, the motor is arranged at the center of the top of the reaction kettle, one end of the stirring shaft is connected with a rotating shaft of the motor, the other end of the stirring shaft is embedded into the reaction kettle, the stirring wheel is arranged on the stirring shaft, the upper end surface of the stirring wheel is of a gradually-changed structure protruding from the periphery to the center, the shaft center of the stirring wheel is provided with a mounting hole, and the stirring wheel is mounted on the stirring shaft through interference fit of the mounting hole and the stirring shaft;
be equipped with a plurality of netted baffles on the convex surface of stirring wheel perpendicularly, it is a plurality of netted baffle all sets up along the diameter direction of stirring wheel, netted baffle is the right angled triangle structure, and the hypotenuse of right angled triangle structure is fixed on the stirring wheel, the bottom surface of stirring wheel is provided with a plurality of wavy stirring leaves, wavy stirring leaf place plane is perpendicular with the bottom surface of stirring wheel, the crisscross crushing tooth that is provided with about the wavy stirring leaf.
9. The coal gangue asphalt mixture as claimed in claim 8, wherein the inside wall of the reaction kettle is provided with a circular baffle plate, the upper end surface of the circular baffle plate is of a gradually changing structure with a recess from the periphery to the center, the axial center of the circular baffle plate is provided with a plurality of circulation holes, and a circular baffle plate is arranged between any two adjacent stirring wheels.
10. The coal gangue asphalt mixture as defined in claim 9, wherein a sealing boss is provided in the middle of the sealing cover plate, four corners of the sealing cover plate are respectively provided with a positioning plate, the positioning plates are vertically arranged on the upper end and the lower end of the sealing cover plate, the upper end and the lower end of the discharging hole are respectively provided with a positioning bulge, the positioning bulge at the upper end of the discharging hole is rotationally connected between two positioning plates at the upper end of the sealing cover plate, a through hole is arranged on the positioning bulge at the lower end of the discharge hole, locking holes matched with the through hole are arranged on the two positioning plates at the lower end of the sealing cover plate, one of the positioning plates at the lower end of the sealing cover plate is provided with a connecting chain, the free end of the connecting chain is provided with a locking bolt, when the sealing cover plate covers the discharging hole, the locking bolt can be inserted into the through hole and the locking hole.
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