CN115219377A - Test device and method for pre-estimating coverage rate of broken stone - Google Patents
Test device and method for pre-estimating coverage rate of broken stone Download PDFInfo
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- 239000010426 asphalt Substances 0.000 claims abstract description 50
- 239000011087 paperboard Substances 0.000 claims abstract description 33
- 230000007246 mechanism Effects 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000012216 screening Methods 0.000 claims abstract description 15
- 239000000123 paper Substances 0.000 claims abstract description 8
- 230000007480 spreading Effects 0.000 claims description 39
- 238000003892 spreading Methods 0.000 claims description 39
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- 238000000611 regression analysis Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 11
- 239000010410 layer Substances 0.000 description 10
- 238000004321 preservation Methods 0.000 description 6
- 238000010998 test method Methods 0.000 description 6
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- 239000002655 kraft paper Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of road engineering materials, and provides a test device and a method for predicting the coverage rate of broken stones, wherein the test device comprises the following steps: the weighing platform is fixed on the base through a mass sensor; a heating mechanism is arranged in the weighing platform, and the upper surface of the weighing platform is a heat-conducting insulating wall; the gravel screening mechanism is arranged above the base through a bracket; a card paper placed on the heat-conductive insulating wall; the jam includes a plurality of areas different from each other. According to the invention, a plurality of paperboard with different areas are placed on the heat-conducting insulating wall, and the crushed stone is combined with the asphalt in a heating state on the paperboard by the weighing platform and the heating mechanism arranged in the weighing platform, so that when the crushed stone screening mechanism provides crushed stones, the total mass of the paperboard and the asphalt before the asphalt and the crushed stones are combined and the total mass of the paperboard, the asphalt and the crushed stones after the asphalt and the crushed stones are combined can be realized by the weighing platform, and accurate test data are provided for the estimation of the coverage rate of the crushed stones.
Description
Technical Field
The invention belongs to the technical field of road engineering materials, and particularly relates to a test device and a test method for predicting the coverage rate of broken stones.
Background
The broken stone coverage rate is a quality control index provided when broken stones are spread in the construction of a road surface sealing layer and a bridge surface waterproof layer, and the size of the broken stone coverage rate influences the bonding capacity of the sealing layer, the waterproof layer and an asphalt surface layer or a bridge surface asphalt pavement layer. In view of this, the development of the related research of the crushed stone coverage rate estimation method is particularly important in the engineering construction field.
The inventor finds that in the related research of the existing estimation method of the coverage rate of the crushed stones, the related specifications do not have clear definitions on the coverage rate of the crushed stones and the spreading amount of the crushed stones, the description of the detection method of the coverage rate of the crushed stones is too simple, the operability is not strong, and a test device for simulating spreading the crushed stones on the site is lacking, so that the coverage rate of the crushed stones is mainly estimated through artificial observation in the existing construction, the error is large, and the quality is difficult to control.
Disclosure of Invention
The invention provides a test device and a test method for estimating the coverage rate of crushed stones in order to solve the problems, the test method is simple, the test device is convenient to operate, and the test device is more suitable for the requirement of rapid detection on a construction site; the device for spreading the gravels can remove the influence of human factors during manual spreading, and the result precision is higher.
In order to achieve the above object, in a first aspect, the present invention provides a test apparatus for estimating coverage of crushed stone, which adopts the following technical scheme:
a test device for macadam coverage estimation, comprising:
the weighing platform is fixed on the base through a mass sensor; a heating mechanism is arranged in the weighing platform, and the upper surface of the weighing platform is a heat-conducting insulating wall;
the broken stone screening mechanism is arranged above the base through a bracket;
the card paper is placed on the heat-conducting insulating wall; the jam includes a plurality of areas different from each other.
Furthermore, a temperature sensor is arranged on the side wall inside the weighing platform.
Furthermore, the heating mechanism is a heating resistance wire.
Further, rubble screening mechanism include the vibration dish and with the sieve of connection can be dismantled to the vibration dish.
Further, the vibration disc is connected with the bracket through a spring.
Furthermore, the lower end of the vibration disc is provided with a telescopic drawing plate.
Furthermore, the vibration cover plate is detachably connected with the bracket; and a vibration motor is arranged on the inner wall of the vibration cover plate.
Furthermore, a main power switch, a temperature switch and a control key, a weighing switch and a control key, a vibration switch and a display screen are arranged on the side surface of the base.
In order to achieve the above object, in a second aspect, the present invention further provides a method for estimating a coverage of crushed stone, which adopts the following technical scheme:
a method for estimating coverage of broken stones, which adopts the test device for estimating coverage of broken stones as described in the first aspect, and sequentially tests a plurality of cardboards with different areas, comprising:
setting the temperature in the device at a preset value;
coating a layer of hot asphalt on the paperboard, placing the paperboard on a weighing platform, and weighing the total mass of the paperboard and the asphalt as a first mass;
the gravel screening mechanism is used for enabling the gravel to fall uniformly and embedding the gravel into the asphalt, and after the excessive gravel is covered on the surface of the asphalt, the gravel screening mechanism and the heating mechanism stop working;
removing the crushed stones scattered on the weighing platform, removing the crushed stones which are not stuck by the asphalt after the asphalt is cooled, and weighing the total mass of the paperboard, the asphalt and the crushed stones as a second mass;
calculating the gravel spreading amount according to the first mass and the second mass; carrying out regression analysis on the crushed stone coverage rate and the spreading amount corresponding to the paperboard with different areas to obtain an equation between the crushed stone coverage rate and the crushed stone spreading amount;
and (4) estimating the coverage rate of the crushed stones by using an equation between the coverage rate of the crushed stones and the spreading amount of the crushed stones.
Further, the crushed stone spreading amount is equal to the difference between the first mass and the second mass.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, a plurality of paperboards with different areas are placed on the heat-conducting insulating wall, and the crushed stone screening mechanism can combine the crushed stone with the asphalt in a heating state on the paperboard when providing the crushed stone, and the weighing table can be used for realizing the total mass of the paperboard and the asphalt before combining the asphalt and the crushed stone and the total mass of the paperboard, the asphalt and the crushed stone after combining the asphalt and the crushed stone, so as to provide accurate test data for the estimation of the coverage rate of the crushed stone;
2. according to the invention, on the basis of defining the gravel coverage rate and the gravel distribution amount, the gravel distribution amount corresponding to the target coverage rate can be rapidly determined through the measured quality, and the regression equation obtained based on the relationship between the gravel coverage rate and the gravel distribution amount can be used for estimating the gravel coverage rate and providing an index basis for controlling the gravel coverage rate on the construction site.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the present embodiments, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the present embodiments and together with the description serve to explain the present embodiments without unduly limiting the present embodiments.
FIG. 1 is a schematic structural view of example 1 of the present invention;
FIG. 2 is a graph showing the relationship between the distribution amount of crushed stones and the coverage of the crushed stones and the linear fitting analysis in example 3 of the present invention;
wherein, 1, a main power switch; 2. a temperature switch and a control key; 3. a weighing switch and a control key; 4. a vibration switch; 5. an LED display screen; 6. a weighing platform; 7. heating resistance wires; 8. a thermally conductive insulating wall; 9. a temperature sensor; 10. a mass sensor; 11. a base; 12. a support; 13. a telescopic drawing plate; 14. vibrating the disc; 15. vibrating the cover plate; 16. a vibration motor; 17. sieving; 18. a buffer spring; 19. and (5) locking.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
The broken stone coverage rate refers to the ratio of the sum of the maximum horizontal projection areas of broken stones embedded in asphalt to a specified area when the broken stones are uniformly spread in the specified area.
The gravel spreading amount refers to a certain weight of gravel uniformly spread in a specified area.
Example 1:
as shown in fig. 1, the present embodiment provides a testing apparatus for estimating coverage of crushed stone, which includes a main power switch 1, a temperature switch and control key 2, a weighing switch and control key 3, a vibration switch 4, an LED display screen 5, a weighing table 6, a heating resistance wire 7, a heat conducting insulating wall 8, a temperature sensor 9, a mass sensor 10, a base 11, a bracket 12, a retractable drawplate 13, a vibration tray 14, a vibration cover plate 15, a vibration motor 16, a sieve 17, a buffer spring 18, a lock catch 19, and the like;
a weighing platform 6 is fixed on the base 11 through a mass sensor 10; a heating mechanism is arranged in the weighing platform 6, and the upper surface of the weighing platform 6 is a heat-conducting insulating wall 8;
the broken stone screening mechanism is arranged above the base 11 through a bracket 12;
a card paper placed on the heat conductive insulating wall 8; the jam includes a plurality of areas different from each other.
This embodiment is through placing a plurality of cardboards of different areas on the heat conduction insulating wall 8, through weigh platform 6 and the heating mechanism of 6 portions settings in the heavy platform can realize when the rubble screening mechanism provides the rubble, with the rubble with the pitch that is in the heating state on the card paper combines, can pass through simultaneously weigh platform 6 realizes the total quality of card paper and pitch before pitch and rubble combine to and the total quality of card paper, pitch and rubble after pitch and rubble combine, provide the accurate test data of precision for rubble coverage prediction, test device's concrete setting is:
in order to uniformly spread broken stones and better simulate the site construction environment, the embodiment designs a corresponding test device, which comprises a control module, a heat preservation and weighing module, a test module and the like, wherein the control module comprises a main power switch 1, a temperature switch and control key 2, a weighing switch and control key 3, a vibration switch 4 and an LED display screen 5; the heat preservation and weighing module comprises a weighing table 6, the heating mechanism, the heat conduction insulating wall 8, the temperature sensor 9, the temperature controller, the mass sensor 10 and the like are arranged in the weighing table 6, and the heating mechanism can be set as a heating resistance wire 7; the test module includes base 11, support 12 the scalable board 13 of taking out, sieve 17 the vibration apron 15 vibration dish 14 buffer spring 18 with hasp 19 etc. vibration apron 15 is built-in vibrating motor 16.
The control module is used for controlling the working state of the test device; the main power switch 1 controls the opening and closing of the device; the temperature switch and control key 2 is connected with the heating resistance wire 7, the temperature sensor 9 and the controller, and is used for controlling the on and off of the heat preservation module, heating and preserving heat according to the set temperature and the like; the weighing switch and control key 3 is connected with the weighing platform 6, the mass sensor 10 and other first-closing parts and is used for controlling the weighing platform to be opened, closed and weighed; the vibration switch 4 is connected with the vibration motor 16 and is used for controlling the on and off of the vibration motor 16; the LED display screen is used for displaying real-time parameters such as temperature, quality and the like of the device.
The heat preservation and weighing module is located above the base 11, provides a constant temperature environment for asphalt, and weighs each test link. The heating resistance wire 7 is wrapped inside the weighing platform 6 by the heat-conducting insulating wall 8 and is detected and controlled by the temperature switch and the control key 2, the temperature sensor 9 and the temperature controller to provide the required heat preservation temperature for the asphalt; the temperature sensor 9 and the temperature controller can be embedded on the table top of the weighing platform 6, for example, on the inner side wall of the weighing platform 6, and are connected with the temperature switch, the control key 2, the LED display screen 5 and the like, so that the temperature of the table top of the weighing platform 6 can be measured in real time, and the temperature can be accurately controlled; the mass sensor 10 is located inside the weighing platform 6, is connected with the weighing switch and the control key 3, the LED display screen 5, and the like, and weighs the mass of each link in the test, and it can be understood that, in this embodiment, the mass sensor 10 may be disposed between the weighing platform 6 and the base 11, and is used for measuring the weight of the object on the weighing platform 6, in other embodiments, the mass sensor 10 may also be disposed in other conventional manners, as long as it can measure the weight of the object on the weighing platform 6.
The test module is used for providing conditions and environments for uniformly spreading broken stones; the base 11 is directly connected with the bracket 12 and the weighing platform 6 to provide a supporting structure for the test device; the telescopic drawing plate 13 is positioned below the sieve 17 and the vibration disc 14, is connected with the bracket 12, and controls the falling of the crushed stones in the sieve by adjusting the extension and contraction states of the telescopic drawing plate 13; the sieve 17 is a set of square-hole sieves with different specifications, and the specifications of the sieve can be adjusted according to the particle size of the crushed stone, so that the particle size of the crushed stone is accurately controlled; the vibration cover plate 15 is internally provided with the vibration motor 16, and the vibration motor 16 is connected with the vibration switch 4 to provide uniform vibration frequency for spreading broken stones; the vibration cover plate 15 is positioned at the top of the device and is connected with the bracket 13 through the lock catch 19, the lock catch 19 is opened to take the vibration cover plate away, crushed stones are placed in the sieve 17 or replace the sieve in the vibration disc, the lock catch 17 is closed, the vibration cover plate 15 is tightly combined with the vibration disc 14 and the sieve 17 at the lower part to form a closed space, so that the sieve 17 is firmly fixed, the vibration disc 14 is driven to vibrate uniformly, and the crushed stones are prevented from overflowing in the vibration process; the vibration disk 14 is connected with the bracket 12 through the buffer spring 18, the vibration cover plate 15 is arranged above the vibration disk, the telescopic pulling plate 13 is arranged below the vibration disk, the vibration disk is in a container shape and hollow, and the sieve 17 can be fixed in the vibration disk to provide a vibration environment for the sieve 17; the buffer spring 18 is connected with the bracket 12 and the vibration disk 14, so that the vibration of the device caused by the overlarge amplitude of the vibration disk 14 can be prevented; the locking buckle 19 is respectively located on the support post 12 and the vibration cover plate 15, and can tightly connect the support post 12 and the vibration cover plate 15. It can be understood that the retractable drawplate 13 can be implemented by a drawplate or a foldable plate, and the bottom of the vibration plate 14 can be opened and closed; the lock catch 19 can adopt a conventional locking or connecting structure and can realize the connecting function; after the vibration cover plate 15 is sealed, the vibration motor 16 may contact the vibration plate 14, or the vibration cover plate 15 may contact the vibration plate 14, so that when the vibration motor 16 vibrates, the vibration plate 14 and the sieve 17 may be driven to vibrate; the vibration plate 14 and the sieve 17 are detachably connected to realize replacement of the sieve 17, for example, the sieve 17 can be directly placed in the vibration plate 14, and other auxiliary detachable connecting parts are arranged on the basis of the conventional arrangement and are not described in detail herein.
During testing, the mass change of the templates coated with the asphalt before and after the gravel spreading is compared, the gravel spreading quality is calculated, an equation between the gravel coverage rate and the gravel spreading amount is determined through regression analysis, and the gravel coverage rate is accurately controlled through the gravel spreading amount.
Compared with the prior art, the test method is simple, the test device is convenient to operate, and the test device is more suitable for the requirement of rapid detection on a construction site; during the experiment, through the device spreading rubble of this embodiment, can get rid of the influence of human factor when artifical spreading, the result precision is higher.
Example 2:
this embodiment provides a method for estimating coverage of broken stones, which adopts the test apparatus for estimating coverage of broken stones as described in embodiment 1 to sequentially test a plurality of cardboards with different areas, and includes:
setting the temperature in the device at a preset value;
coating a layer of hot asphalt on the paperboard, placing the paperboard on a weighing platform, and weighing the total mass of the paperboard and the asphalt as a first mass;
the crushed stone is uniformly dropped and embedded into the asphalt through the crushed stone screening mechanism, and the crushed stone screening mechanism and the heating mechanism stop working after the excessive crushed stone is covered on the surface of the asphalt;
removing the scattered gravels on the weighing platform, removing the gravels which are not stuck by the asphalt after the asphalt is cooled, and weighing the total mass of the paperboard, the asphalt and the gravels as a second mass;
calculating the crushed stone distribution amount according to the first mass and the second mass; carrying out regression analysis on the crushed stone coverage rate and the spreading amount corresponding to the paperboard with different areas to obtain an equation between the crushed stone coverage rate and the crushed stone spreading amount;
and (4) estimating the coverage rate of the crushed stones by using an equation of the coverage rate of the crushed stones and the spreading amount of the crushed stones.
In the embodiment, an area equivalence method is adopted to carry out an indoor gravel coverage rate test; the indoor test can adopt the area of a track plate test mold, the size of the track plate test mold is a square of 30cm multiplied by 30cm, and the track plate test mold can also be manufactured into a specified area (not less than 900 cm) according to the requirement 2 ) Is/are as followsAnd (5) testing a round or square mould. The specified macadam coverage rate of 100% is the fully paved state of macadams, which means the fully paved area, and the relationship between the macadam coverage rates of 100%, 90%, 80%, 70% and the like and the macadam spreading amount is further studied by controlling the fully paved area. The fully paved state of the crushed stones in the test is as follows: spreading excessive crushed stone in the specified area, and removing the crushed stone which is not stuck by the asphalt to obtain the maximum amount of the residual crushed stone. The specific test steps are as follows:
s1, cutting a paperboard according to a specified area, and if a track plate is adopted for testing a mold and the coverage rate of broken stones is 100%, cutting the paperboard into a square of 30cm multiplied by 30 cm; the paperboard can adopt kraft paper and the like;
s2, placing the cut paperboard in a test mold, uniformly coating hot asphalt with specified mass on the surface according to design requirements, weighing immediately, and recording the total weight m of the paperboard and the asphalt 1 ；
S3, rapidly spreading excessive broken stones into the test mold, wherein the broken stones on the paperboard are overlapped and asphalt does not leak out, standing and cooling to room temperature, and then removing the broken stones on the surface which are not adhered by the asphalt, wherein the coverage rate corresponding to the amount of all the broken stones adhered to the paperboard is specified to be 100% (namely full pavement);
s4, weighing again, and recording the total weight m of the paperboard, the asphalt and the macadam 2 (ii) a By m 2 Minus m 1 Obtaining Δ m 1 Namely the spreading quality of the broken stones.
S5, according to an area equivalence method, if the broken stone coverage rate is set to be 90%, 80%, 70%, 60% and the like, the paperboard can be respectively cut into the areas of 810cm 2 、720cm 2 、630cm 2 And 540cm 2 The square is equal, the test process from the step S2 to the step S4 is repeated, and the gravel spreading quality delta m is obtained 2 、△m 3 、△m 4 And Δ m 5 Etc.;
and S6, performing linear regression on the different gravel coverage rates and the corresponding gravel spreading amounts to obtain a regression equation between the gravel coverage rate and the spreading amount, and estimating the gravel spreading amount corresponding to the target coverage rate by using the equation to accurately control the coverage rate index in field construction and ensure the construction quality of a sealing layer or a waterproof layer.
Example 3:
the embodiment provides a method for estimating the coverage of crushed stone, which is further described and implemented in embodiment 2 on the basis of embodiment 1, and the specific implementation steps are as follows:
s1, cutting the paperboard according to a specified area by adopting an area control method. If a rutting plate is adopted for testing the mold, the broken stone coverage rate is respectively 100 percent, 90 percent, 80 percent and 70 percent, and then the test pieces are respectively cut into rectangles with the length of 30cm multiplied by 30cm, 30cm multiplied by 27cm, 30cm multiplied by 24cm and 30cm multiplied by 21 cm;
s2, opening a main power switch 1 and a temperature switch 2, and setting the temperature at 50 ℃;
s3, coating a layer of hot asphalt on the cut template, placing the template on a weighing platform 6 in a heat preservation state, turning on a weighing switch, and weighing the total mass m of the template and the asphalt 1 ；
S4, closing the telescopic pulling plate 13, opening the lock catch 19, taking down the vibrating cover plate 15, placing the sieve 17 with the model corresponding to the gravel into the vibrating disc 14 for clamping, and pouring a proper amount of gravel into the sieve 17;
s5, installing the vibration cover plate 15, tightly closing the lock catch 19, and closing the lock catch after opening the vibration switch for 45S to ensure that the crushed stones in the sieve are uniformly distributed;
s6, opening the telescopic pulling plate 13 and the vibration switch 4 to enable the crushed stones to fall uniformly and be embedded into the asphalt, and closing the vibration switch 4 and the temperature switch after the excessive crushed stones are covered on the surface of the asphalt;
s7, removing the crushed stone scattered on the weighing table, removing the crushed stone which is not stuck by the asphalt after the asphalt is cooled, and weighing the total mass m of the template, the asphalt and the crushed stone 2 ；
S8, after the test is finished, closing the weighing switch, taking out redundant broken stones in the sieve 17, and cleaning the test device;
s9, calculating the spreading quantity of the crushed stones, wherein the spreading quantity is delta m, and the spreading quantity is more than or equal to m 2 -m 1 And carrying out regression analysis on the different gravel coverage rates and the corresponding gravel distribution amount to obtain an equation between the gravel coverage rate and the gravel distribution amount. The gravel distribution amounts corresponding to different gravel coverage rates are shown in Table 1, lineThe sexual regression analysis is shown in FIG. 2.
TABLE 1 gravel distribution amount for different gravel coverage
The linear regression equation obtained is shown in the following formula, and the correlation coefficient is 0.999.
y＝0.225x+0.85424
Wherein, x represents the spreading mass of the broken stone, g; y-crushed stone coverage,%.
Therefore, a relational equation between the coverage rate of the crushed stones and the spreading amount of the crushed stones is established, and the spreading amount of the crushed stones corresponding to the target coverage rate can be estimated according to the equation during site construction or test, so that the site construction quality is controlled. If the types and the gradation of the crushed stones adopted by the actual engineering are changed, the relation equation needs to be established again according to the test method.
The testing device has the advantages of simple and light structure, better simulation of actual conditions, full automation of operation process, accurate control and the like; the test method is simple and convenient to operate, the calculation of the test indexes is accurate and easy to obtain, and a large amount of manpower and material resources can be saved for the estimation work of the coverage rate of the crushed stone.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various modifications and variations. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present embodiment should be included in the protection scope of the present embodiment.
Claims (10)
1. A test device for rubble coverage prediction, characterized by, includes:
the weighing platform is fixed on the base through a mass sensor; a heating mechanism is arranged in the weighing platform, and the upper surface of the weighing platform is a heat-conducting insulating wall;
the gravel screening mechanism is arranged above the base through a bracket;
the card paper is placed on the heat-conducting insulating wall; the jam includes a plurality of areas different from each other.
2. The test device for the pre-estimation of the crushed stone coverage rate as claimed in claim 1, wherein a temperature sensor is arranged on the inner side wall of the weighing platform.
3. The test device for the estimation of the coverage rate of the crushed stones as claimed in claim 1, wherein the heating mechanism is a heating resistance wire.
4. The test device for the estimation of the coverage rate of the broken stones according to claim 1, wherein the broken stone screening mechanism comprises a vibration disk and a screen detachably connected with the vibration disk.
5. The test device for rock coverage estimation of claim 4, wherein the vibration disc is connected with the bracket through a spring.
6. The test device for the estimation of the coverage rate of the crushed stones according to claim 4, wherein the lower end of the vibrating disk is provided with a telescopic pulling plate.
7. The test device for the pre-estimation of the coverage rate of the crushed stones according to claim 4, further comprising a vibrating cover plate which is detachably connected with the bracket; and a vibration motor is arranged on the inner wall of the vibration cover plate.
8. The testing device for the pre-estimation of the coverage rate of the crushed stones as claimed in claim 1, wherein the side surface of the base is provided with a main power switch, a temperature switch and a control key, a weighing switch and a control key, a vibration switch and a display screen.
9. A crushed stone coverage estimation method, characterized in that, the test device for crushed stone coverage estimation according to any one of claims 1-8 is adopted to sequentially test a plurality of paper jams with different areas, and the method comprises the following steps:
setting the temperature in the device at a preset value;
coating a layer of hot asphalt on the paperboard, placing the paperboard on a weighing platform, and weighing the total mass of the paperboard and the asphalt as a first mass;
the crushed stone is uniformly dropped and embedded into the asphalt through the crushed stone screening mechanism, and the crushed stone screening mechanism and the heating mechanism stop working after the excessive crushed stone is covered on the surface of the asphalt;
removing the crushed stones scattered on the weighing platform, removing the crushed stones which are not stuck by the asphalt after the asphalt is cooled, and weighing the total mass of the paperboard, the asphalt and the crushed stones as a second mass;
calculating the gravel spreading amount according to the first mass and the second mass; carrying out regression analysis on the crushed stone coverage rate and the crushed stone spreading amount corresponding to the paperboard with different areas to obtain a relation equation between the crushed stone coverage rate and the crushed stone spreading amount;
and estimating the coverage rate of the crushed stones by using a relation equation between the coverage rate of the crushed stones and the spreading amount of the crushed stones.
10. The method of claim 9, wherein the distribution of crushed stone is equal to the difference between the first mass and the second mass.
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