CN114560642A - Two-stage modification device and method for high-hydrophobicity asphalt concrete acidic aggregate - Google Patents
Two-stage modification device and method for high-hydrophobicity asphalt concrete acidic aggregate Download PDFInfo
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- 230000004048 modification Effects 0.000 title claims abstract description 18
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- 238000000034 method Methods 0.000 title claims description 16
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/0007—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B20/04—Heat treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
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- 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
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Abstract
The invention discloses a two-stage modification device and a two-stage modification method for high-hydrophobicity asphalt concrete acidic aggregate, which comprises an upper-layer main conveyor belt, wherein a first silane emulsion container and a first papermaking sludge container are sequentially arranged above the upper-layer main conveyor belt according to a transmission direction, a lower-layer auxiliary conveyor belt is arranged below the upper-layer main conveyor belt, a second papermaking sludge container and a second silane emulsion container are sequentially arranged between the upper-layer main conveyor belt and the lower-layer auxiliary conveyor belt and according to the transmission direction of the lower-layer auxiliary conveyor belt, a modified aggregate collecting box is arranged at the transmission tail end of the lower-layer auxiliary conveyor belt, and a gravity sensing device is arranged below the modified aggregate collecting box. The invention solves the problem of high cost of manufacturing the asphalt concrete in the area lacking the alkaline stone.
Description
Technical Field
The invention belongs to the technical field of asphalt concrete seepage prevention, and relates to a two-stage modification device for high-hydrophobicity asphalt concrete acidic aggregate and a two-stage modification method for the high-hydrophobicity asphalt concrete acidic aggregate.
Background
The asphalt concrete has the characteristics of excellent seepage-proofing performance, strong basic deformation adaptability, convenience in repair and engineering maintenance once defects occur, and the like, and is widely applied to water conservancy and hydropower engineering. From the chemical analysis, in the hot mixing process of the asphalt mixture, when the asphalt mixture is combined with the acidic asphalt, the alkaline aggregate and the asphalt can generate chemical reaction to form a water-insoluble compound and generate chemical adsorption, while the acidic aggregate and the acidic asphalt can not generate chemical reaction, so that the structure is more stable, only the physical adsorption of intermolecular force can be generated, the cohesiveness is not strong in chemical adsorption force, and the cohesiveness with the asphalt is poor. The water intrusion into the interface between asphalt and aggregate exists in the form of water film or water vapor on the surface of hydraulic building in long-term contact with water, and because water is more likely to infiltrate into the aggregate surface than asphalt, which is a hydrophobic substance, the asphalt on the surface is replaced by water and stripped from the aggregate surface, thus seriously damaging the structural stability and generating water damage. Therefore, the aggregates used in early asphalt concretes were all basic aggregates. However, in practical hydraulic and hydroelectric engineering applications, the selection of hydraulic asphalt concrete aggregates follows the principle of from near to far, first superior and then inferior, according to local conditions and local materials, and in some dam site areas, within a reasonable economic transport distance range, a proper alkaline rock material source cannot be found necessarily, and only neutral or acidic aggregates such as granite and quartzite can be found. The basic aggregate source distribution is not in the range of each engineering site and nearby, when the basic aggregate source is not in the nearby area of the engineering site or the transport distance is far, only the neutral or acid aggregate source can be selected nearby to replace the basic aggregate of asphalt concrete in consideration of the cost, the distribution of carbonate rock in the nature only accounts for 0.25 percent of the total amount of rock, and the basic aggregate resources in many places in the western part of China are limited. Although the acid rock is hard, compact and strong in wear resistance, the acid rock has poor adhesion with asphalt, so that the application of acid aggregate is very limited in the prior art, the application of the acid aggregate cannot better ensure the bonding strength between the asphalt and the acid aggregate when slaked lime is added or saturated lime water is used for treatment, the asphalt film is very easy to peel off under the action of moisture, and the asphalt is rapidly damaged by water such as particle falling, loosening, pit and the like.
Disclosure of Invention
The invention aims to provide a two-stage modification device for high-hydrophobicity asphalt concrete acidic aggregate, which solves the problem that the cost for manufacturing asphalt concrete in an area lacking alkaline stone is high.
Another object of the present invention is to provide a two-stage modification method of highly hydrophobic asphalt concrete acidic aggregate.
The invention adopts the technical scheme that the two-stage modification device for the high-hydrophobicity asphalt concrete acidic aggregate comprises an upper-layer main conveyor belt, wherein a first silane emulsion container and a first papermaking sludge container are sequentially arranged above the upper-layer main conveyor belt according to the transmission direction, a lower-layer auxiliary conveyor belt is arranged below the upper-layer main conveyor belt, a second papermaking sludge container and a second silane emulsion container are sequentially arranged between the upper-layer main conveyor belt and the lower-layer auxiliary conveyor belt according to the transmission direction of the lower-layer auxiliary conveyor belt, a modified aggregate collecting box is arranged at the transmission tail end of the lower-layer auxiliary conveyor belt, and a gravity sensing device is arranged below the modified aggregate collecting box.
The present invention is also characterized in that,
the first silane emulsion container is connected with a first spray head through a first hose, and a valve is arranged on the first hose.
The bottom of first papermaking sludge container is provided with first filter screen, and the top that just is located first filter screen on the first papermaking sludge container is provided with the valve.
And a second filter screen is arranged at the bottom of the second papermaking sludge container, and a valve is arranged on the second papermaking sludge container and above the second filter screen.
The second silane emulsion container is connected with a second spray head through a second hose, and a valve is arranged on the second hose.
The difference of the upper distance and the lower distance between the upper layer main conveyor belt and the lower layer auxiliary conveyor belt is 0.3m, and the transmission starting end of the lower layer auxiliary conveyor belt is at least 2m longer than the transmission terminating end of the upper layer main conveyor belt.
The invention adopts another technical scheme that a two-stage modification method of the high-hydrophobicity asphalt concrete acidic aggregate adopts a two-stage modification device of the high-hydrophobicity asphalt concrete acidic aggregate, and the concrete process is as follows:
step 1, pretreating acidic aggregate: placing the acidic aggregate with the particle size of 10-20 mm into a drying device for drying treatment, controlling the temperature at 100-130 ℃ and the time at 120 minutes to obtain pretreated acidic aggregate;
The present invention is also characterized in that,
the transmission speed of the upper layer main conveyor belt is 1m/s, the transmission speed of the lower layer auxiliary conveyor belt is 1m/s to 4m/s, the uniform speed is increased progressively, the uniform speed is decreased progressively from 4m/s to 1m/s, the circulation is carried out, and the completion time of each increasing and each decreasing is 10 s.
The beneficial effect of the invention is that,
(1) the invention greatly strengthens the adhesiveness of the acid aggregate and the asphalt by wrapping the web with the papermaking sludge ash for the acid aggregate, improves the durability of the asphalt concrete and the like, and can save the materials of the alkaline aggregate by adopting the acid aggregate, thereby greatly solving the problem of aggregate source of the asphalt concrete;
(2) the invention uses paper making sludge ash to wrap the abdomen, the paper making sludge belongs to biological solid waste, which not only contains a large amount of cellulose organic matters and plant nutrients such as nitrogen, phosphorus, potassium and the like, but also contains pathogens which are easy to decay and stink; the papermaking sludge is used as solid waste, and is directly discarded, so that not only is the environmental pollution caused, but also the waste of resources is caused, and the alkalinity of the papermaking sludge can be processed for an anti-stripping agent;
(3) the invention uses silane emulsion to moisten the paper making sludge ash, the silane is a milky, tasteless, nontoxic and noncorrosive liquid, when the silane emulsion acts with acid aggregate, the ethanol is released and combined with the base material to be converted into organic silicon resin polymer, finally a layer of hydrophobic film is formed on the surface of capillary pores of the acid aggregate, thereby preventing water molecules and harmful ions from permeating into the base material to achieve the aim of waterproof protection, and the silane micromolecule can rapidly permeate on the capillary pore wall in the base material. The chemical reaction speed is moderate, so that the excellent penetration capacity and penetration depth are possessed. The impermeability and the waterproofness of the asphalt concrete can be improved by wetting with silane;
(4) the invention greatly saves the cost in the selection of the anti-stripping agent, the wetting agent and the final aggregate, and brings huge economic benefits to huge projects.
Drawings
FIG. 1 is a schematic structural view of a two-stage modification apparatus for highly hydrophobic asphalt concrete acidic aggregate according to the present invention.
In the figure, 1, a first silane emulsion container, 2, a silane emulsion, 3, a valve, 4, a first hose, 5, a first spray head, 6, an aggregate pile, 7, a first paper making sludge container, 8, paper making sludge ash, 9, a first filter screen, 10, an upper layer main conveyor belt, 11, a lower layer auxiliary conveyor belt, 12, a modified aggregate collecting box, 13, a gravity sensing device, 14, a second silane emulsion container, 15, a second hose, 16, a second spray head, 17, a second paper making sludge container and 18, a second filter screen.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a two-stage modification device for high-hydrophobicity asphalt concrete acidic aggregate, which has a structure shown in figure 1 and comprises an upper-layer main conveyor belt 10, wherein a first silane emulsion container 1 and a first papermaking sludge container 7 are sequentially arranged above the upper-layer main conveyor belt 10 according to a transmission direction, the first silane emulsion container 1 is connected with a first spray head 5 through a first hose 4, a valve 3 is arranged on the first hose 4, a first filter screen 9 is arranged at the bottom of the first papermaking sludge container 7, the valve 3 is arranged on the first papermaking sludge container 7 and above the first filter screen 9, a lower-layer auxiliary conveyor belt 11 is arranged below the upper-layer main conveyor belt 10, a second papermaking sludge container 17 and a second silane emulsion container 14 are sequentially arranged between the upper-layer main conveyor belt 10 and the lower-layer auxiliary conveyor belt 11 and according to the transmission direction of the lower-layer auxiliary conveyor belt 11, a second filter screen 18 is arranged at the bottom of the second papermaking sludge container 17, a valve 3 is arranged on a second paper sludge container 17 and above a second filter screen 18, a second silane emulsion container 14 is connected with a second spray head 16 through a second hose 15, the second hose 15 is provided with the valve 3, a modified aggregate collecting box 12 is arranged at the transmission tail end of a lower-layer auxiliary conveyor belt 11, a gravity sensing device 13 is arranged below the modified aggregate collecting box 12, the difference of the vertical distance between an upper-layer main conveyor belt 10 and the lower-layer auxiliary conveyor belt 11 is 0.3m, and the transmission starting end of the lower-layer auxiliary conveyor belt 11 is at least 2m longer than the transmission stopping end of the upper-layer main conveyor belt 10.
The invention also provides a two-stage modification method of the high-hydrophobicity asphalt concrete acidic aggregate, which adopts a two-stage modification device of the high-hydrophobicity asphalt concrete acidic aggregate, and the specific process is as follows:
step 1, pretreating acidic aggregate: placing the acidic aggregate with the particle size of 10-20 mm into a drying device for drying treatment, controlling the temperature at 100-130 ℃ and the time at 120 minutes to obtain pretreated acidic aggregate;
The transmission rate of the upper layer main conveyor belt 10 is 1m/s, the transmission rate of the lower layer auxiliary conveyor belt 11 is 1-4m/s, the sprinkling rate of the first silane emulsion container 1, the first paper-making sludge container 7, the second paper-making sludge container 17 and the second silane emulsion container 14 is 2-6m/s, the flow rate of the silane emulsion 2 is 2-6m/s, and the flow rate of the paper-making sludge ash 8 is 2-6 m/s; the diameters of outlets at the bottom of the first spray head 5, the first paper making sludge container 7, the second spray head 16 and the second silane emulsion container 14 are 1 m.
Comparative example 1
Granite macadam for an asphalt concrete core wall of a pumped storage power station in Xinjiang is taken as an acidic aggregate, and Clarity 90# A-grade asphalt is adopted as asphalt. The acidic aggregate was not subjected to any treatment.
The adhesion between the acidic aggregate and the asphalt was tested according to the aggregate-asphalt adhesion test (water boiling method) in the Hydraulic asphalt concrete test procedure (DL/T5362-2009). The adhesiveness between the acid aggregate and the asphalt is evaluated according to the regulations of the test regulations of hydraulic asphalt concrete (DL/T5362-2009), and the grade of the adhesiveness between the aggregate and the asphalt is divided into: 5. 4, 3, 2, 1 rating.
Comparative example 2
Limestone macadam for a bituminous concrete core wall of a certain pumped storage power station in Shaanxi is taken as alkaline aggregate, and Clarity 90# A-grade asphalt is adopted as asphalt. The basic aggregate was not subjected to any treatment.
The adhesion between the acidic aggregate and the asphalt was tested according to the aggregate-asphalt adhesion test (poaching method) in the Hydraulic asphalt concrete test protocol (DL/T5362-2009). The adhesion between the acid aggregate and the asphalt is evaluated according to the regulations of the test regulations of hydraulic asphalt concrete (DL/T5362-2009), and the grade of the adhesion between the aggregate and the asphalt is divided into: 5. 4, 3, 2, 1 rating.
Example 1
Granite macadam for an asphalt concrete core wall of a pumped storage power station in Xinjiang is taken as an acidic aggregate, and Clarity 90# A-grade asphalt is adopted as asphalt;
the acid aggregate is treated according to the following process: placing the acidic aggregate with the particle size of 10-20 mm into a drying device for drying treatment, controlling the temperature at 100-130 ℃ and the time at 120 minutes to obtain pretreated acidic aggregate;
the method comprises the steps of placing pretreated acidic aggregate on an upper-layer main conveyor belt 10, placing silane emulsion 2 in a first silane emulsion container 1, placing papermaking sludge ash 8 in a first papermaking sludge container 7, sequentially opening the upper-layer main conveyor belt 10, a valve 3 on the first silane emulsion container 1 and a valve 3 on the first papermaking sludge container 7, wetting the acidic aggregate by the silane emulsion 2, wrapping the acidic aggregate by the papermaking sludge ash 8 to obtain a primary improved acidic aggregate, dropping the primary improved acidic aggregate onto a lower-layer auxiliary conveyor belt 11, sequentially opening a valve 3 on a lower-layer auxiliary conveyor belt 11, a valve 3 on a second papermaking sludge container 17 and a valve 3 on a second silane emulsion container 14, primarily improving the papermaking sludge ash 8 wrapping the acidic aggregate, wetting the primary improved acidic aggregate by the silane emulsion 2, finally dropping into a modified aggregate collecting box 12, and when the weight measured by a gravity sensing device 13 meets the requirement, all the valves 3, the upper main conveyor 10 and the lower auxiliary conveyor 11 are closed to obtain the improved acidic aggregate.
The transmission rate of the upper layer main conveyor belt 10 is 1m/s, the transmission rate of the lower layer auxiliary conveyor belt 11 is uniformly increased from 1m/s to 2m/s, when the transmission rate reaches 2m/s, the transmission rate is decreased from 2m/s to 1m/s at a constant speed, the reciprocating circulation is carried out, the completion time of each increasing and each decreasing is 10s, and the sprinkling rate of the first silane emulsion container 1, the first papermaking sludge container 7, the second papermaking sludge container 17 and the second silane emulsion container 14 is 2 m/s.
The adhesion between the acidic aggregate and the asphalt was tested according to the aggregate-asphalt adhesion test (poaching method) in the Hydraulic asphalt concrete test protocol (DL/T5362-2009). The adhesion between the acid aggregate and the asphalt is evaluated according to the regulations of the test regulations of hydraulic asphalt concrete (DL/T5362-2009), and the grade of the adhesion between the aggregate and the asphalt is divided into: 5. 4, 3, 2, 1 rating.
Example 2
The difference from embodiment 1 is that: the conveying speed of the lower auxiliary conveyor belt 11 is uniformly increased from 2m/s to 3m/s, and after the conveying speed reaches 3m/s, the conveying speed is uniformly decreased from 3m/s to 2m/s, the reciprocating circulation is carried out, the completion time of each increasing and decreasing is 10s, and the sprinkling speed of the first silane emulsion container 1, the first papermaking sludge container 7, the second papermaking sludge container 17 and the second silane emulsion container 14 is 4 m/s.
The adhesion between the acidic aggregate and the asphalt was tested according to the aggregate-asphalt adhesion test (poaching method) in the Hydraulic asphalt concrete test protocol (DL/T5362-2009). The adhesion between the acid aggregate and the asphalt is evaluated according to the regulations of the test regulations of hydraulic asphalt concrete (DL/T5362-2009), and the grade of the adhesion between the aggregate and the asphalt is divided into: 5. 4, 3, 2, 1 rating.
Example 3
The difference from embodiment 1 is that: the conveying speed of the lower auxiliary conveyor belt 11 is uniformly increased from 3m/s to 4m/s, and after the conveying speed reaches 4m/s, the conveying speed is uniformly decreased from 4m/s to 3m/s, the reciprocating circulation is carried out, the finishing time of each increasing and each decreasing is 10s, and the sprinkling speed of the first silane emulsion container 1, the first papermaking sludge container 7, the second papermaking sludge container 17 and the second silane emulsion container 14 is 6 m/s.
The adhesion between the acidic aggregate and the asphalt was tested according to the aggregate-asphalt adhesion test (poaching method) in the Hydraulic asphalt concrete test protocol (DL/T5362-2009). The adhesion between the acid aggregate and the asphalt is evaluated according to the regulations of the test regulations of hydraulic asphalt concrete (DL/T5362-2009), and the grade of the adhesion between the aggregate and the asphalt is divided into: 5. 4, 3, 2, 1 rating.
Results of the poaching process the aggregate to asphalt adhesion ratings for the different examples are given in the following table:
| item | Comparative example 1 | Comparative example 2 | Example 1 | Example 2 | Example 3 |
| Adhesion rating | 1 | 4 | 3 | 3 | 4 |
From the results of the water boiling method test, the adhesion between granite and the acidic aggregate in the comparative example is only grade 1, and the adhesion is the worst, while the adhesion grade of the basic limestone aggregate in the comparative example 2 is higher and is grade 4, and after the acidic aggregate is modified, the adhesion in the examples 1 and 2 reaches grade 3 under the synergistic effect of the silane emulsion and the papermaking sludge ash, so that the adhesion is greatly improved, and the adhesion is improved to grade 4 for the example 3, so that the improvement effect is the most obvious, and is consistent with the adhesion of the basic limestone in the comparative example 2. Analysis shows that after the speed of the lower-layer secondary conveyor belt 11 is increased, the tumbling effect on the aggregates is increased, and the surface treatment of the aggregates is more uniform.
Claims (8)
1. The two-stage modification device for the high-hydrophobicity asphalt concrete acidic aggregate is characterized by comprising an upper-layer main conveyor belt (10), wherein a first silane emulsion container (1) and a first papermaking sludge container (7) are sequentially arranged above the upper-layer main conveyor belt (10) according to a transmission direction, a lower-layer auxiliary conveyor belt (11) is arranged below the upper-layer main conveyor belt (10), a second papermaking sludge container (17) and a second silane emulsion container (14) are sequentially arranged between the upper-layer main conveyor belt (10) and the lower-layer auxiliary conveyor belt (11) and according to the transmission direction of the lower-layer auxiliary conveyor belt (11), the lower-layer auxiliary conveyor belt (11) is provided with a modified aggregate collecting box (12) at the transmission end of the lower-layer auxiliary conveyor belt, and a gravity sensing device (13) is arranged below the modified aggregate collecting box (12).
2. The two-stage modification device of the highly hydrophobic asphalt concrete acidic aggregate according to claim 1, wherein the first silane emulsion container (1) is connected with a first spray nozzle (5) through a first hose (4), and the first hose (4) is provided with a valve (3).
3. The two-stage modification device of the highly hydrophobic asphalt concrete acidic aggregate according to claim 1, characterized in that a first filter screen (9) is arranged at the bottom of the first paper sludge container (7), and a valve (3) is arranged on the first paper sludge container (7) and above the first filter screen (9).
4. The two-stage modification device of the highly hydrophobic asphalt concrete acidic aggregate according to claim 1, characterized in that a second filter screen (18) is arranged at the bottom of the second paper sludge container (17), and a valve (3) is arranged on the second paper sludge container (17) and above the second filter screen (18).
5. The two-stage modification device of the highly hydrophobic asphalt concrete acidic aggregate according to claim 1, wherein the second silane emulsion container (14) is connected with a second spray nozzle (16) through a second hose (15), and the second hose (15) is provided with a valve (3).
6. The apparatus for the two-stage modification of highly hydrophobic asphalt concrete acidic aggregate according to claim 1, wherein the difference in the vertical distance between the upper main conveyor (10) and the lower auxiliary conveyor (11) is 0.3m, and the transmission start end of the lower auxiliary conveyor (11) is at least 2m longer than the transmission end of the upper main conveyor (10).
7. The two-stage modification method of the highly hydrophobic asphalt concrete acidic aggregate is characterized in that the two-stage modification device of the highly hydrophobic asphalt concrete acidic aggregate according to any one of claims 1 to 6 is adopted, and the specific process is as follows:
step 1, pretreating acidic aggregate: placing the acidic aggregate with the particle size of 10-20 mm into a drying device for drying treatment, controlling the temperature at 100-130 ℃ and the time at 120 minutes to obtain pretreated acidic aggregate;
step 2, placing the pretreated acidic aggregate on an upper layer main conveyor belt (10), placing silane emulsion (2) in a first silane emulsion container (1), placing papermaking sludge ash (8) in a first papermaking sludge container (7), opening the upper layer main conveyor belt (10), a valve (3) on the first silane emulsion container (1) and a valve (3) on the first papermaking sludge container (7) in sequence, wetting the acidic aggregate by the silane emulsion (2), wrapping the abdomen by the papermaking sludge ash (8) to obtain a primary improved acidic aggregate, dropping the primary improved acidic aggregate on a lower layer auxiliary conveyor belt (11), opening the lower layer auxiliary conveyor belt (11), a valve (3) on a second papermaking sludge container (17) and a valve (3) on a second silane emulsion container (14) in sequence, and wrapping the papermaking sludge ash (8) on the abdomen by the primary improved acidic aggregate, and wetting by the silane emulsion (2), finally dropping into the modified aggregate collecting box (12), and closing all the valves (3), the upper-layer main conveyor belt (10) and the lower-layer auxiliary conveyor belt (11) when the weight measured by the gravity sensing device (13) meets the requirement to obtain the improved acidic aggregate.
8. The method for the two-stage modification of the highly hydrophobic asphalt concrete acidic aggregate according to claim 7, wherein the conveying speed of the upper main conveyor belt (10) is 1m/s, the conveying speed of the lower auxiliary conveyor belt (11) is 1m/s to 4m/s, the constant speed is increased gradually, the constant speed is decreased gradually from 4m/s to 1m/s, the circulation is carried out, and the completion time of each increasing and each decreasing is 10 s.
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