CN111812010A - Indoor acceleration simulation device for self-cleaning behavior of large-gap asphalt mixture - Google Patents
Indoor acceleration simulation device for self-cleaning behavior of large-gap asphalt mixture Download PDFInfo
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- CN111812010A CN111812010A CN202010854060.5A CN202010854060A CN111812010A CN 111812010 A CN111812010 A CN 111812010A CN 202010854060 A CN202010854060 A CN 202010854060A CN 111812010 A CN111812010 A CN 111812010A
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- 239000000203 mixture Substances 0.000 title claims abstract description 60
- 239000010426 asphalt Substances 0.000 title claims abstract description 58
- 238000004140 cleaning Methods 0.000 title claims abstract description 23
- 238000004088 simulation Methods 0.000 title claims abstract description 15
- 230000001133 acceleration Effects 0.000 title claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 123
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 230000007246 mechanism Effects 0.000 claims abstract description 40
- 238000002474 experimental method Methods 0.000 claims abstract description 23
- 238000005507 spraying Methods 0.000 claims abstract description 11
- 230000009471 action Effects 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000011800 void material Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009430 construction management Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/002—Test chambers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/004—Investigating resistance of materials to the weather, to corrosion, or to light to light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/008—Monitoring fouling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
- G01N3/567—Investigating resistance to wear or abrasion by submitting the specimen to the action of a fluid or of a fluidised material, e.g. cavitation, jet abrasion
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Abstract
The invention discloses an indoor acceleration simulation device for self-cleaning behavior of a large-gap asphalt mixture, which comprises an experiment box body, a water drainage test bed fixed in the experiment box body and spraying mechanisms fixed on two sides of the water drainage test bed, wherein a positioning mechanism is arranged on the water drainage test bed; the device also comprises a longitudinal driving mechanism fixed on the experimental box body, a rotating mechanism fixedly connected with the driving end of the longitudinal driving mechanism and a bracket fixedly connected with the rotating shaft of the rotating mechanism, wherein a load block is placed on the bracket, and the end part of the bracket is connected with a test wheel; the test wheel is positioned above the water drainage test bed. The experimental device can simulate the self-cleaning behavior of the inner gap of the large-gap asphalt mixture under the conditions of different driving speeds, axle weights, temperatures and ultraviolet intensities, thereby providing a data basis for optimizing the proportion of the large-gap asphalt mixture from the viewpoint of prolonging the service life of the large-gap asphalt mixture and providing a guidance suggestion for the use occasion and the maintenance planning of the large-gap asphalt mixture.
Description
Technical Field
The invention relates to an indoor acceleration simulation device for self-cleaning behavior of a large-gap asphalt mixture.
Background
With the continuous development of urban road construction, the sponge city concept gradually enters the visual field of planning designers, and the construction of sponge test-point projects in ecological science and technology islands of Jiangxizhou and Dingjiazhuang security housing districts of Jiangxizhou is mainly promoted if Nanjing city is in 'sponge city planning construction management regulations' in 2019. The large-gap asphalt mixture can meet the requirement of resisting the repeated action of the driving load on a conventional asphalt pavement and can also provide good drainage and noise reduction performance. The large-gap asphalt mixture is used as the surface layer to form the drainage road surface, rainwater can be timely discharged along the inner gap side direction of the surface layer when rainfall occurs, the formation of a road surface water film is effectively reduced, the possibility of vehicle slippage is reduced, water mist at the side rear part of a tire is reduced, better visibility is provided for rear drivers, and the driving safety is obviously improved. Big void structure has good noise reduction effect simultaneously, and when tire and road surface contact produced "air pump and pumped" effect, the air of compressed can be through inside intercommunication space fast diffusion to the road surface, and the diffusion in-process can consume partial energy, reduces noise intensity from the source promptly. Research shows that the large-aperture asphalt pavement generally reduces the rainy-day accident rate by 76% and reduces the noise by 3-8 dB compared with the common asphalt pavement.
The large-gap asphalt mixture inevitably becomes the development trend of asphalt pavements in the future, and the drainage and noise reduction performance of the large-gap asphalt mixture has an inseparable relationship with the void ratio of the large-gap asphalt mixture. Along with the increase of the service time of the pavement, solid materials such as particulate matters, tire abrasion matters and the like in the air and other turbid matters in the rainwater are gathered in the gaps of the asphalt mixture under the action of gravity or rainwater, so that the actual void ratio of the asphalt mixture is reduced, and the drainage and noise reduction performance of the pavement is greatly reduced or even disappears. Therefore, the recovery of the void fraction of large void asphalt mixtures is of great importance.
Relevant researches show that pollutants gathered in gaps of a road surface can be loosened or even flushed out of the inner gaps under severe vibration by an air pumping effect generated by contact of a tire of a travelling crane and the road surface, so that the effect of gradually recovering the actual porosity of the road surface is realized, and the drainage and noise reduction performance is gradually recovered, namely the self-cleaning behavior of the inner gaps of the large-gap asphalt mixture.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an experimental device capable of simulating self-cleaning behavior of the inner gap of a large-gap asphalt mixture under the conditions of different driving speeds, axle weights, temperatures, ultraviolet intensities and different pollutant concentrations.
The technical scheme is as follows: the indoor acceleration simulation device for the self-cleaning behavior of the large-gap asphalt mixture comprises an experiment box body, a water drainage test bed fixed in the experiment box body and spraying mechanisms fixed on two sides of the water drainage test bed, wherein a positioning mechanism is arranged on the water drainage test bed; the device also comprises a longitudinal driving mechanism fixed on the experimental box body, a rotating mechanism fixedly connected with the driving end of the longitudinal driving mechanism and a bracket fixedly connected with the rotating shaft of the rotating mechanism, wherein a load block is placed on the bracket, and the end part of the bracket is connected with a test wheel; the test wheel is positioned above the water drainage test bed.
Wherein, still be equipped with ultraviolet lamp and heating device in the experimental box body.
The asphalt mixture test piece is placed on the water drainage test bed, the area of the upper surface of the water drainage test bed is larger than the area of the bottom surface of the asphalt mixture test piece, the upper surface of the water drainage test bed is provided with a plurality of through hole structures, the through hole structures are communicated with the inner cavity of the water drainage test bed, and the inner cavity of the water drainage test bed is connected with a water drainage tank through a pipeline.
The spraying mechanism comprises a vertical pipe fixed on the side edge of the water drainage test bed and a spraying head fixed at the water outlet end of the vertical pipe, the water inlet end of the vertical pipe is connected with the water supply tank through a pipeline, and a lifting pump is arranged on the pipeline.
Wherein the angle between the spray header and the horizontal plane is adjustable; the spraying direction of the spray header faces to the water drainage test bed.
The positioning mechanism comprises a fixed plate fixed on the drainage test bed, a movable plate arranged opposite to the fixed plate and a hydraulic cylinder for driving the movable plate to move close to or far away from the fixed plate along the drainage test bed; the fixed end of the hydraulic cylinder is fixed in the experimental box body, and the driving end of the hydraulic cylinder is fixedly connected with the movable plate.
The vertical driving mechanism is an air cylinder, the rotating mechanism is a motor, the air cylinder is fixed to the top of the experiment box body through a connecting frame, the fixed end of the air cylinder is fixed to the connecting frame, and the driving end of the air cylinder penetrates through the connecting frame to be fixedly connected with the motor.
Wherein, the junction of motor rotating shaft and support is equipped with the shaft coupling.
Has the advantages that: the experimental device can simulate the self-cleaning action of the inner gap of the large-gap asphalt mixture under the conditions of different driving speeds, axle weights, temperatures and ultraviolet intensities, thereby providing a data basis for the optimized proportion of the large-gap asphalt mixture from the viewpoint of prolonging the service life of the large-gap asphalt mixture, providing a guidance suggestion for the use occasion and the maintenance planning of the large-gap asphalt mixture, and effectively improving the use effect of the large-gap asphalt mixture.
Drawings
FIG. 1 is a schematic diagram of the experimental apparatus of the present invention.
Detailed Description
The technical solution of the present invention is further explained with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the indoor acceleration simulation device for the self-cleaning behavior of the large-gap asphalt mixture comprises an experiment box body 2 with a horizontal sliding door 7, a water drainage test bed 17 fixed in the experiment box body 2 and spraying mechanisms fixed on two sides of the water drainage test bed 17, wherein each spraying mechanism comprises a vertical pipe 15 fixed on the side edge of the water drainage test bed 17 and a spraying head 9 fixed on the water outlet end of the vertical pipe 15, the water inlet end of the vertical pipe 15 is connected with a water supply tank 19 through a pipeline 26, and a lifting pump is arranged on the pipeline 26; the spray header 9 and the horizontal plane form an angle larger than 0 degree, and the spray direction of the spray header 9 faces to the water drainage test bed 17; the asphalt mixture test piece 14 is placed on the water drainage test bed 17, the area of the upper surface of the water drainage test bed 17 is larger than the area of the bottom surface of the asphalt mixture test piece 14, the upper surface of the water drainage test bed 17 is provided with a plurality of through hole structures, the through hole structures are communicated with the inner cavity of the water drainage test bed, and the inner cavity of the water drainage test bed is connected with the water drainage tank 1 outside the box body 2 through a water drainage pipe 18; a positioning mechanism is arranged on the drainage test bed 17, the positioning mechanism comprises a fixed plate 16 fixed on the drainage test bed 17, a movable plate 11 arranged opposite to the fixed plate 16 and a hydraulic cylinder 10 for driving the movable plate 11 to move close to the fixed plate 16 or far away from the fixed plate 16 along the drainage test bed 17, the fixed end of the hydraulic cylinder 10 is fixed on the bottom plate of the experiment box body 2, the driving end of the hydraulic cylinder 10 is fixedly connected with the movable plate 11, and the distance between the movable plate 11 and the fixed plate 16 is adjusted according to the size of an asphalt mixture test piece 14 placed on the drainage test bed 17; the indoor acceleration simulation device for the self-cleaning behavior of the large-gap asphalt mixture further comprises a longitudinal driving mechanism fixed on the experiment box body 2, a rotating mechanism fixedly connected with the driving end of the longitudinal driving mechanism and a support 23 fixedly connected with a rotating shaft of the rotating mechanism, wherein the support 23 comprises a connecting rod 24 and a U-shaped frame 25 fixedly connected with the connecting rod 24, a load block 8 is placed on a horizontal beam of the U-shaped frame 25, and two end parts of the U-shaped frame 25 are connected with the experiment wheels 13; the test wheel 13 is positioned right above the draining test bed 17; the vertical driving mechanism is a cylinder 21, the rotating mechanism is a motor 3, the cylinder 21 is fixed at the top of the experiment box body 2 through a connecting frame 20, the fixed end of the cylinder 21 is fixed on the connecting frame 20, the driving end 22 of the cylinder 21 penetrates through the connecting frame 20 to be fixedly connected with the motor 3, and a coupler 6 is arranged at the connecting position of a connecting rod 24 of a rotating shaft of the motor 3 and a support 23.
An ultraviolet lamp 5 and a heating device 4 are also arranged in the experiment box body 2; wherein the heating device 4 is a PTC air heater, and the ultraviolet lamps 5 are symmetrically arranged on the top plate of the experiment box body 2.
The device is used for an indoor acceleration simulation test of the self-cleaning behavior of the large-gap asphalt mixture, and the self-cleaning behavior capability of the large-gap asphalt mixture under the corresponding running speed, axle weight, temperature and ultraviolet intensity is evaluated;
the specific test steps are as follows:
(1) forming an asphalt mixture test piece 14 according to the test specification, determining the initial water permeability coefficient of the asphalt mixture test piece according to the road engineering asphalt and asphalt mixture test specification (JTG E20), and recording as C1；
(2) Determining the composition of the simulated sewage, preparing the particulate matters and the turbid matters into a pollutant solution with a certain concentration according to a proportion, and adding the pollutant solution into a water supply tank 19, wherein the function of the pollutant solution is to provide gap plugs;
(3) opening a horizontal sliding door 7 of the experiment box body 2, lifting a test wheel 13 through a longitudinal driving mechanism, placing a test piece 14 on a drainage test bed 17, and adjusting the distance between a moving plate 11 and a fixed plate 16 through a hydraulic cylinder 10 to fix the test piece 14 between the moving plate 11 and the fixed plate 16;
(4) closing the horizontal sliding door 7, opening a lifting pump on a pipeline 26 between the water supply tank 19 and the vertical pipe 15, adjusting to the flow rate required by the test, and starting timing after the water flow of the spray header 9 is stable; in the test process, the residual amount of the sewage in the water supply tank 19 is observed, and the sewage amount with the standard concentration is configured and supplemented in time;
(5) in the test process, water penetrating through the asphalt mixture test piece 14 flows into the inner cavity of the drainage test bed through the through hole on the drainage test bed 17 and is discharged to the drainage water tank 1 through the drainage pipe 18;
(6) after the test required time is reached, the lift pump is closed, the sliding door 7 is opened, the test piece 14 is taken out, and the water seepage coefficient after the gap of the asphalt mixture test piece 14 is blocked is determined and recorded as C2；
(7) Repeating the step 3, putting the asphalt mixture test piece 14 on the test bed 17 again, putting down the test wheel 13 through the longitudinal driving mechanism, adjusting the number of the load blocks 8 on the horizontal beam of the U-shaped frame 25 until the test requirement pressure, pushing the sliding door bolt 12 to close the sliding door 7, and avoiding the temperature loss in the box body 2 in the test process;
(8) opening the PTC air heater 4 on the side wall of the experiment box body 2, and adjusting to the temperature required by the experiment; simultaneously turning on the ultraviolet lamp 5 to adjust the ultraviolet intensity required by the test;
(9) turning on the motor 3, adjusting the rotating speed of the test wheel 13 to the test required speed to enable the test wheel to do uniform-speed circular motion on the asphalt mixture test piece 14, performing pumping action on the test wheel, and starting timing;
(10) after the test required time is reached, the PTC air heater 4, the ultraviolet lamp 5 and the motor 3 are closed, the sliding door 7 is opened, the test wheel 13 is lifted, the test piece 14 is taken out, the water seepage coefficient of the asphalt mixture test piece 14 after the gap is self-cleaned under the action of the tire pump suction is measured and is marked as C3And calculating the coefficient of water permeability recovery coefficient of the test piece according to the following formula: r ═ C3-C2)/C1X 100%. The larger the value is, the stronger the self-cleaning behavior capability of the asphalt mixture under the corresponding running speed, axle weight, temperature and ultraviolet intensity is; in the formula, C1The initial water permeability coefficient of the test piece is obtained; c2The water seepage coefficient of the test piece after being blocked by pollutants; c3The water seepage coefficient of the test piece after self-cleaning; and R is the self-cleaning behavior capability coefficient of the test piece.
The device can also be used for an accelerated wear test of an asphalt mixture test piece to evaluate the wear resistance of the asphalt mixture under the conditions of corresponding running speed, axle weight, temperature and ultraviolet intensity;
the specific test steps are as follows:
(1) forming an asphalt mixture test piece 14 according to the test specification, determining the initial skid resistance coefficient of the asphalt mixture test piece according to the road engineering asphalt and asphalt mixture test specification (JTG E20), and recording as S1；
(2) Opening a horizontal sliding door 7 of the experiment box body 2, lifting a test wheel 13 through a longitudinal driving mechanism, placing a test piece 14 on a drainage test bed 17, and adjusting the distance between a moving plate 11 and a fixed plate 16 through a hydraulic cylinder 10 to fix the test piece 14 between the moving plate 11 and the fixed plate 16;
(3) the testing wheel 13 is lowered through the longitudinal driving mechanism, the number of the load blocks 8 on the horizontal beam of the U-shaped frame 25 is adjusted until the pressure required by the test, the sliding door bolt 12 is pushed to close the sliding door 7, the temperature in the box body 2 is prevented from being dissipated in the test process, and the sliding door 7 is closed;
(4) opening the PTC air heater 4 on the side wall of the experiment box body 2, and adjusting to the temperature required by the experiment; simultaneously turning on the ultraviolet lamp 5 to adjust the ultraviolet intensity required by the test;
(5) turning on the motor 3, adjusting the rotating speed of the test wheel 13 to the test required speed to enable the test wheel to do uniform-speed circular motion on the asphalt mixture test piece 14, performing abrasion on the test wheel, and starting timing;
(6) after the required test time is reached, the PTC air heater 4, the ultraviolet lamp 5 and the motor 3 are closed, the sliding door 7 is opened, the test piece 14 is taken out, the anti-sliding coefficient of the abraded asphalt mixture test piece 14 is measured and recorded as S2And calculating the anti-skid property attenuation coefficient of the test piece according to the following formula: t ═ C2-C1)/C1X 100%. The larger the value (T) is, the higher the attenuation degree of the anti-skid performance of the asphalt mixture under the corresponding running speed, axle weight, temperature and ultraviolet intensity is; in the formula, S1The initial anti-slip coefficient of the test piece is obtained; c2The anti-sliding coefficient of the abraded test piece is; and T is the anti-skid property attenuation coefficient of the test piece.
Claims (7)
1. The utility model provides an indoor simulation device that accelerates of big space bituminous mixture automatically cleaning action which characterized in that: the device comprises an experiment box body, a water drainage test bed fixed in the experiment box body and spraying mechanisms fixed on two sides of the water drainage test bed, wherein a positioning mechanism is arranged on the water drainage test bed; the device also comprises a longitudinal driving mechanism fixed on the experimental box body, a rotating mechanism fixedly connected with the driving end of the longitudinal driving mechanism and a bracket fixedly connected with the rotating shaft of the rotating mechanism, wherein a load block is placed on the bracket, and the end part of the bracket is connected with a test wheel; the test wheel is positioned above the water drainage test bed.
2. The indoor acceleration simulation device of big space bituminous mixture self-cleaning action of claim 1, characterized in that: an ultraviolet lamp and a heating device are further arranged in the experiment box body.
3. The indoor acceleration simulation device of big space bituminous mixture self-cleaning action of claim 1, characterized in that: the asphalt mixture test piece is placed on the water drainage test bed, the area of the upper surface of the water drainage test bed is larger than the area of the bottom surface of the asphalt mixture test piece, the upper surface of the water drainage test bed is provided with a plurality of through hole structures, the through hole structures are communicated with the inner cavity of the water drainage test bed, and the inner cavity of the water drainage test bed is connected with a water drainage tank through a pipeline.
4. The indoor acceleration simulation device of big space bituminous mixture self-cleaning action of claim 1, characterized in that: the spraying mechanism comprises vertical pipes fixed on two side edges of the water discharge test bed and a spraying head fixed at a water outlet end of the vertical pipes, a water inlet end of the vertical pipes is connected with a water supply tank through a pipeline, and a lifting pump is arranged on the pipeline.
5. The indoor acceleration simulation device of big space bituminous mixture self-cleaning action of claim 1, characterized in that: the positioning mechanism comprises a fixed plate fixed on the drainage test bed, a movable plate arranged opposite to the fixed plate and a hydraulic cylinder for driving the movable plate to move close to or far away from the fixed plate along the drainage test bed; the fixed end of the hydraulic cylinder is fixed in the experimental box body, and the driving end of the hydraulic cylinder is fixedly connected with the movable plate.
6. The indoor acceleration simulation device of big space bituminous mixture self-cleaning action of claim 1, characterized in that: the vertical driving mechanism is an air cylinder, the rotating mechanism is a motor, the air cylinder is fixed to the top of the experiment box body through a connecting frame, the fixed end of the air cylinder is fixed to the connecting frame, and the driving end of the air cylinder penetrates through the connecting frame to be fixedly connected with the motor.
7. The indoor acceleration simulation device of big space bituminous mixture self-cleaning action of claim 1, characterized in that: a coupling is arranged at the joint of the motor rotating shaft and the bracket.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010854060.5A CN111812010A (en) | 2020-08-21 | 2020-08-21 | Indoor acceleration simulation device for self-cleaning behavior of large-gap asphalt mixture |
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| CN202010854060.5A CN111812010A (en) | 2020-08-21 | 2020-08-21 | Indoor acceleration simulation device for self-cleaning behavior of large-gap asphalt mixture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466076A (en) * | 2021-07-28 | 2021-10-01 | 广东长亨石业有限公司 | Abrasion device and test method for machine-made sand test piece |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466076A (en) * | 2021-07-28 | 2021-10-01 | 广东长亨石业有限公司 | Abrasion device and test method for machine-made sand test piece |
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