CN215727513U - Pressure vessel-based aggregate adhesion testing device - Google Patents
Pressure vessel-based aggregate adhesion testing device Download PDFInfo
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- CN215727513U CN215727513U CN202120465522.4U CN202120465522U CN215727513U CN 215727513 U CN215727513 U CN 215727513U CN 202120465522 U CN202120465522 U CN 202120465522U CN 215727513 U CN215727513 U CN 215727513U
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Abstract
The utility model discloses an aggregate adhesion testing device based on a pressure container. It is including can confined pressure vessel, the instrument casing that has control system and be used for carrying out the heating device that heats to pressure vessel, can place the aggregate that wraps up in the pitch that awaits measuring in the pressure vessel, pressure vessel's side is provided with air pressure compensation arrangement, air pressure compensation arrangement is connected with pressure vessel and can compensate the heating temperature that makes water not restricted by experimental environment atmospheric pressure through control system's control in to pressure vessel, and then confirm the required temperature of adhesion test between aggregate and pitch according to the softening point of different pitch. The advantages are that: the method not only meets the measurement of the adhesiveness between aggregate and the traditional road petroleum asphalt, but also meets the measurement of the adhesiveness between the aggregate and special asphalt such as polymer modified asphalt, rubber asphalt, composite modified asphalt and the like, and is not limited by the measurement of the atmospheric pressure of the environment.
Description
Technical Field
The utility model relates to an aggregate and asphalt adhesiveness test device based on the saturated vapor pressure of water, in particular to an aggregate adhesiveness test device based on a pressure container, and belongs to the technical field of road engineering.
Background
In recent years, with the continuous development of the transportation industry of China, the total mileage of roads is continuously increased, and the quality grade is continuously improved. However, the early damage of the road surface, especially the early water damage such as loosening, peeling and pit under the repeated action of factors such as temperature, rain water and traffic load, not only reduces the service life of the asphalt road surface, but also brings the road into a large-scale maintenance period in advance, increases the maintenance cost of the road surface, and gradually arouses the general attention of the road boundary.
The main cause of water damage to asphalt pavements is the two-way destructive effect of water soaking between the aggregate and the asphalt film of the asphalt mix: the adhesion of the asphalt to the mineral aggregate is reduced; the bonding force between the asphalt mixtures is damaged; therefore, the method evaluates the adhesion between the aggregate and the asphalt by a real and effective method, adopts corresponding technical means to improve the capability of the asphalt film on the surface of the aggregate to resist stripping caused by water erosion, and is an important way for prolonging the service life of the asphalt pavement.
The existing boiling method is a standard method for evaluating the adhesiveness between coarse aggregate and asphalt by the current regulation, and comprises the following basic steps: firstly, taking 5 aggregates with the particle size of 13.2-19mm, cleaning the aggregates with water, tying the aggregates with fine wires, and heating the aggregates for 1 hour in an oven at the temperature of 105 +/-5 ℃; secondly, lifting the heated aggregate particles one by one, immersing the aggregate particles into preheated asphalt (130-150 ℃) for 45s, then taking out the aggregate particles slightly to ensure that the surfaces of the aggregate particles are completely and uniformly coated by asphalt films, and then suspending and cooling the aggregate coated with the asphalt films on a sample rack for 15 min; thirdly, after the aggregate particles are cooled, the aggregate particles are lifted one by using a line and immersed into the center of a large beaker filled with slightly boiled water, and a heating furnace is adjusted to ensure that the water in the beaker keeps a slightly boiling state but no boiled foam is allowed; and fourthly, after the aggregate is soaked and boiled for 3min, taking out the aggregate from the water, properly cooling the aggregate, then placing the aggregate into a beaker filled with normal-temperature water, visually observing the stripping degree of the asphalt film on the surfaces of the aggregate particles, and judging the adhesion between the aggregate and the asphalt according to the stripping degree.
Through theoretical analysis and the expression of determining the adhesiveness between the aggregate and the asphalt by combining the boiling method, the key factors influencing the boiling method to determine the adhesiveness between the aggregate and the asphalt are as follows: the surface alkalinity of the aggregate is acidic due to the existence of asphalt anhydride, so that the stronger the surface alkalinity of the aggregate, the better the adhesion with asphalt, and conversely, the poorer the adhesion with asphalt; the micro roughness of the aggregate surface is higher, the larger the micro pores of the aggregate surface are, the higher the mutual sliding resistance between the aggregate surface and asphalt is, the better the adhesiveness is, and on the contrary, the smoother the aggregate surface is, the worse the adhesiveness is; the larger the asphalt viscosity is, the larger the adhesion work and the adhesive force between the asphalt and the aggregate surface are, the stronger the water-resisting stripping ability is, and the better the adhesion is; the cohesive force among the asphalt molecules is larger, the capability of resisting water tearing of the asphalt membrane is stronger, and water is not easy to immerse a joint surface between the asphalt and the aggregate; the water temperature and the foam size in a micro-boiling state, the higher the temperature is, the lower the viscosity of the asphalt is, and the larger the water bubbles are, the larger the scouring kinetic energy of the water is, so that the asphalt is more easily fallen off from the surface of the aggregate when the water temperature is higher and the bubbles are larger during micro-boiling; sixthly, the micro-boiling time is short, and the longer the micro-boiling time is, the more obvious the etching effect of water is. By taking the key factors influencing the determination of the adhesiveness between the aggregate and the asphalt by the boiling method into account, on the premise of determining the material, the surface acidity and alkalinity and the roughness of the aggregate, the viscosity of the asphalt and the cohesion between asphalt molecules are fixed, so the factors influencing the authenticity of the boiling method are the water temperature during micro-boiling, the foam size and the micro-boiling time, wherein the test procedures of the foam size and the micro-boiling time during micro-boiling are strictly limited and can only be followed, and therefore, the determination of the micro-boiling state and the water temperature are the core of the determination of the authenticity of the adhesiveness between the aggregate and the asphalt by the reaction boiling method.
However, the micro-boiling temperature of 100 ℃ for determining the adhesion between the coarse aggregate and the asphalt by the boiling method specified in the test procedure for asphalt and asphalt mixtures for road engineering is due to two reasons: a large number of researches believe that the test is carried out at 50 ℃ above the softening point of the asphalt, so that the water erosion process of the asphalt pavement under the use condition can be better simulated; because of the historical limitation, the asphalt used on the asphalt pavement in China is common road petroleum asphalt, and the softening point of the asphalt is about 50 ℃. However, with the continuous development of asphalt material technology, besides the petroleum asphalt for roads, a great amount of special asphalt such as polymer modified asphalt, rubber asphalt, composite modified asphalt and the like with high viscosity and high cohesion are applied to asphalt pavement construction and maintenance engineering, the softening point is far higher than 50 ℃, basically about 80 ℃, even more, above 90 ℃, if 100 ℃ is still adopted as the micro-boiling temperature, the hard nuclear asphalt membrane formed on the surface of the aggregate by the special asphalt is not enough to be softened, the water immersion is blocked, the measured adhesion result is always good, and the test result shows that the adhesion between the aggregate and the asphalt is distorted, so that a great hidden danger is buried for the water damage of the asphalt pavement. Meanwhile, the slightly boiling state of water is limited by atmospheric pressure, the critical temperature of water in liquid state and gas state is 100 ℃ under the standard atmospheric pressure, and the critical temperature is reduced along with the reduction of the atmospheric pressure, so that the adhesion between the aggregate and the asphalt measured by adopting the standard boiling method in a high-altitude area is higher than the real adhesion, and conversely, the measured value in a low-altitude area is lower than the real adhesion.
Under the background, it is necessary to develop a testing apparatus for measuring the adhesion between aggregate and asphalt, which is not only suitable for measuring the adhesion between aggregate and traditional road petroleum asphalt, but also can accurately determine the adhesion between aggregate and special asphalt, and is not limited by the atmospheric pressure of the measuring environment, so as to provide a new way for evaluating the adhesion between asphalt and coarse aggregate.
Disclosure of Invention
The utility model aims to provide a pressure container-based aggregate adhesion test device which can meet the measurement of the adhesion between aggregates and traditional road petroleum asphalt and the measurement of the adhesion between aggregates and special asphalt such as polymer modified asphalt, rubber asphalt, composite modified asphalt and the like, and is not limited by the measurement of the atmospheric pressure of the environment.
In order to solve the technical problem, the aggregate adhesion test device based on the pressure container comprises the pressure container which can be closed, an instrument shell with a control system and a heating device for heating the pressure container, aggregate to be tested and coated with asphalt can be placed in the pressure container, an air pressure compensation device is arranged beside the pressure container, the air pressure compensation device is connected with the pressure container and can compensate the pressure in the pressure container under the control of the control system, so that the heating temperature of water is not limited by the atmospheric pressure of a test environment, and the water temperature required by an adhesion test between the aggregate and the asphalt is determined according to the softening points of different asphalts.
And a stirring device is arranged in the pressure container.
The stirring device is a magnetic stirrer.
The heating device is an electromagnetic heating disc arranged at the bottom of the pressure container.
The air pressure compensation device comprises an air booster pump positioned beside the pressure container and a pressure air pipeline connected to the air booster pump, and the pressure air pipeline extends into the pressure container.
The top of the pressure container is provided with a pressure container cover, and the pressure container cover is provided with a secondary safety valve and a primary safety valve.
And a pressure sensor and a temperature sensor are arranged in the pressure container.
The control system is provided with a time controller, a temperature controller, a pressure controller and a stirring device adjusting knob.
A sample frame is arranged in the pressure container, and the aggregate coated with the asphalt is hoisted on the sample frame through a cord.
The side of the pressure container is provided with two pull rods, a pressing strip located at the top of the pressure container is arranged between the tops of the two pull rods, and a pressing strip limiting stopper is arranged on the pressing strip.
And the pressure container is provided with a test observation window.
Compared with the prior art, the utility model has the following advantages:
1. compared with the traditional test, the air pressure compensation device is arranged beside the pressure container to ensure that the heating temperature of water is not limited by the atmospheric pressure of the test environment, so that the water temperature required by the adhesion test between the aggregate and the asphalt can be conveniently determined according to the softening points of different asphalts, the water is in a micro-boiling state under the water temperature condition, the measurement of the adhesion between the aggregate and the traditional road petroleum asphalt is met, the measurement of the adhesion between the aggregate and special asphalt such as polymer modified asphalt, rubber asphalt, composite modified asphalt and the like is also met, meanwhile, the limitation of measuring the atmospheric pressure of the environment is avoided, and the defect of measuring the adhesion between coarse aggregate and the asphalt by a water boiling method in the conventional road engineering asphalt and asphalt mixture test procedure is thoroughly overcome.
2. The temperature that can guarantee water through the magnetic stirrers and the electromagnetic heating dish that set up is more homogeneous, and the test process water can be sustainable to be kept boiling the state a little and not produce the boiling foam, and the test result is more accurate, makes it have easy operation, swift, characteristics such as data science, accuracy through the control unit who sets up simultaneously.
3. Through the primary safety valve and the secondary safety valve, the limit supercharging value of the air booster pump is limited, the minimum allowable pressure of the pressure container and the observation window is limited, the safety factor of the equipment can be greatly improved, and the test process is safe and controllable.
Drawings
FIG. 1 is a schematic structural diagram of an aggregate adhesion testing device based on a pressure vessel according to the present invention;
in the figure: 1. a pressure vessel cover; 2. a secondary safety valve; 3. a layering limiter; 4. a primary safety valve; 5. layering; 6. sealing the rubber ring; 7. a pull rod; 8. a pressure vessel; 9. a pressurized air line; 10. aggregate coated with asphalt; 11. a pressure sensor; 12. a thin wire; a U-shaped support block; 14. testing an observation window; 15. a stopper; 16. a temperature sensor; 17. test water; 18. a bolt; 19. an air booster pump; 20. a magnetic stirrer; 21. a power switch of the air booster pump; 22. a heating power switch; 23. a main power switch; 24. a sample holder; 25. adjusting knob of magnetic stirrer; 26. a pressure controller; 27. a temperature controller; 28. a time controller; 29. a controller signal light; 30. a supporting seat; 31. an instrument housing; 32. electromagnetic heating plate.
Detailed Description
The aggregate adhesion testing device based on pressure vessel of the present invention will be described in further detail with reference to the accompanying drawings and the detailed description.
The first embodiment is as follows:
as shown in the figure, the aggregate adhesion test device based on the pressure container can be used for accurately measuring the adhesion between aggregate, rock block and different types of asphalt materials for various roads such as basalt, limestone, diabase, granite and the like under different altitude conditions, and comprises a pressure container 8 which can be closed, an instrument shell 31 with a control system and a heating device for heating the pressure container 8, wherein the pressure container selected in the embodiment is of a cylindrical structure, the cylinder bottom and the cylinder wall of the pressure container are welded, and the maximum allowable pressure of the pressure container is greater than 1.5 Mpa; as can be seen from the figure, the heating device is an electromagnetic heating disk 32 arranged at the bottom of the pressure container 8, and the electromagnetic heating disk selected in the embodiment can raise 3L of water with 90 ℃ to 150 ℃ within 30 s; the top of the pressure container 8 is provided with a pressure container cover 1, the pressure container cover 1 and the pressure container 8 can be in threaded connection, a sealing ring 6 is arranged between the pressure container cover 1 and the pressure container 8, so that the pressure container 8 can be sealed, a stirring device 20 is arranged in the pressure container 8, the stirring device 20 is preferably a magnetic stirrer, in the embodiment, the bottom of the pressure container is provided with 2 magnetic stirrers, a sample frame 24 is arranged in the pressure container 8, specifically, two U-shaped supporting blocks 13 which are oppositely arranged are arranged on the inner wall of the pressure container 8, and the sample frame is fixed by welding the U-shaped supporting blocks and the wall of the pressure container through the 2U-shaped supporting blocks during installation; the test sample rack 24 is horizontally arranged between the two U-shaped supporting blocks 13, aggregate 10 which is hung through a cord (string) 12 and is wrapped with asphalt is arranged on the test sample rack 24, test water 17 is contained in the pressure container 8, the aggregate 10 wrapped with the asphalt is immersed in the test water 17, a test observation window 14 is arranged on the front surface of the wall of the pressure container, a pressure sensor 11 and a temperature sensor 16 are further arranged in the pressure container 8, an air pressure compensation device is arranged beside the pressure container 8, the air pressure compensation device is connected with the pressure container 8 and can compensate the pressure in the pressure container through the control of a control system, so that the heating temperature of the water is not limited by the atmospheric pressure of the test environment, and the water temperature required by the adhesion test between the aggregate and the asphalt is determined according to the softening points of different asphalts.
In addition, during installation, in order to save space and facilitate operation, the pressure vessel 8 is installed on the upper part of the instrument shell 31, that is, the electromagnetic heating disc is positioned on the top surface of the instrument shell, the pressure vessel is arranged right above the electromagnetic heating disc, and meanwhile, in order to ensure the reliability of the installation position of the pressure vessel 8, four limiting blocks 15 positioned on the periphery of the pressure vessel 8 are arranged on the instrument shell 31, four supporting seats 30 are arranged at the bottom of the instrument shell 31, and the four supporting seats 30 are made of high-strength rubber materials, are fixedly connected with the instrument shell and are supported at 4 corners of the instrument shell; the instrument shell 31 is also provided with a main power switch 23, an air booster pump power switch 21 and a warming power switch 22; certainly, a time controller 28, a temperature controller 27, a pressure controller 26, a magnetic stirrer adjusting knob (stirring device adjusting knob) 25 and a plurality of controller signal lamps 29 are also arranged, wherein the time controller is in signal linkage with a heating power switch and an air booster pump power switch, the pressure controller is in signal linkage with the air booster pump power switch, the temperature controller is in signal linkage with the heating power switch, and the pressure controller is in signal linkage with the temperature controller; as can be seen from the figure, a controller signal lamp 29 for indicating control information is further respectively arranged above the time controller 28, the temperature controller 27 and the pressure controller 26, and the control system can control the operation of the magnetic stirrer by adjusting the magnetic stirrer adjusting knob 25 by using the time controller 28, the temperature controller 27, the pressure controller 26 and the magnetic stirrer adjusting knob 25 as a control unit.
Furthermore, the air pressure compensation device comprises an air booster pump 19 located beside the pressure vessel 8 and a pressure air line 9 connected to the air booster pump, the pressure air line 9 is located at the pressure vessel cover 1, and the pressure air line 9 extends into the pressure vessel 8, wherein the air booster pump used in the present embodiment is a 220V booster pump, and the boost limit value is 1.0 Mpa.
And furthermore, a secondary safety valve 2 and a primary safety valve 4 are arranged on the pressure container cover 1, the interiors of the secondary safety valve 2 and the primary safety valve 4 are connected with the pressure container, the exterior of the secondary safety valve 2 and the primary safety valve 4 is connected with the atmosphere, the primary safety valve can automatically release pressure when the pressure in the pressure container reaches 1.1Mpa, and the secondary safety valve can automatically release pressure when the pressure in the pressure container reaches 1.3 Mpa.
Furthermore, two pull rods 7 are arranged beside the pressure container 8, the two pull rods 7 are fixedly installed on the instrument shell 31 through fasteners 18, a pressing strip 5 located at the top of the pressure container 8 (namely, the upper part of the pressure container cover 1) is arranged between the tops of the two pull rods 7, a pressing strip limiting stopper 3 is arranged on the pressing strip 5, when the pressure container is installed, two ends of the pressing strip are connected with the two pull rods through bolts, and the pressing strip is fixed in the center of a top cover of the pressure container through the pressing strip limiting stopper.
Furthermore, the wall and the top of the pressure vessel can be attached with heat-insulating layers, the test observation window is made of double layers of high-pressure-resistant glass, the pressure limit value of the glass is more than 1.5Mpa, in addition, the temperature sensor is positioned at 1/3 above the bottom of the pressure vessel, and the pressure sensor is positioned at 3/4 above the bottom of the pressure vessel; the pressure sensor is linked with the pressure controller by signals, and the temperature sensor is linked with the temperature controller by signals.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (10)
1. The utility model provides an adhesion test device gathers materials based on pressure vessel which characterized in that: including can confined pressure vessel (8), instrument casing (31) that have control system and be used for carrying out the heating device that heats pressure vessel (8), can place the aggregate (10) of wrapping up in the asphalt that awaits measuring in pressure vessel (8), the side of pressure vessel (8) is provided with air pressure compensation arrangement, air pressure compensation arrangement is connected with pressure vessel (8) and can compensate the heating temperature who makes water not restricted by experimental environment atmospheric pressure through the control of control system to the pressure in the pressure vessel, and then confirms the required temperature of adhesion test between aggregate and asphalt according to the softening point of different asphalt.
2. The pressure vessel based aggregate adhesion test apparatus of claim 1, wherein: and a stirring device (20) is arranged in the pressure container (8).
3. The pressure vessel based aggregate adhesion test apparatus of claim 2, wherein: the stirring device (20) is a magnetic stirrer.
4. The pressure vessel based aggregate adhesion test apparatus according to claim 1, 2 or 3, wherein: the heating device is an electromagnetic heating disc (32) arranged at the bottom of the pressure container (8).
5. The pressure vessel based aggregate adhesion test apparatus of claim 4, wherein: the air pressure compensation device comprises an air booster pump (19) located beside the pressure container (8) and a pressure air pipeline (9) connected to the air booster pump, wherein the pressure air pipeline (9) extends into the pressure container (8).
6. The pressure vessel based aggregate adhesion test apparatus according to claim 1, 2, 3 or 5, wherein: the top of the pressure container (8) is provided with a pressure container cover (1), and a secondary safety valve (2) and a primary safety valve (4) are arranged on the pressure container cover (1).
7. The pressure vessel based aggregate adhesion test apparatus of claim 6, wherein: and a pressure sensor (11) and a temperature sensor (16) are arranged in the pressure container (8).
8. The pressure vessel based aggregate adhesion test apparatus of claim 7, wherein: the control system has a time controller (28), a temperature controller (27), a pressure controller (26), and a stirring device adjustment knob (25).
9. The pressure vessel based aggregate adhesion test apparatus according to claim 1, 2, 3, 5, 7 or 8, wherein: a sample frame (24) is arranged in the pressure container (8), and the aggregate (10) coated with the asphalt is hung on the sample frame (24) through a thread rope (12).
10. The pressure vessel based aggregate adhesion test apparatus of claim 9, wherein: the side of pressure vessel (8) is provided with two pull rods (7), two be provided with layering (5) that are located pressure vessel (8) top between the top of pull rod (7), be provided with layering stopper (3) on layering (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120465522.4U CN215727513U (en) | 2021-03-03 | 2021-03-03 | Pressure vessel-based aggregate adhesion testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120465522.4U CN215727513U (en) | 2021-03-03 | 2021-03-03 | Pressure vessel-based aggregate adhesion testing device |
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| CN215727513U true CN215727513U (en) | 2022-02-01 |
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| CN202120465522.4U Active CN215727513U (en) | 2021-03-03 | 2021-03-03 | Pressure vessel-based aggregate adhesion testing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114643084A (en) * | 2022-03-25 | 2022-06-21 | 山东交通学院 | Annular shunting accelerated loading environment cabin |
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2021
- 2021-03-03 CN CN202120465522.4U patent/CN215727513U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114643084A (en) * | 2022-03-25 | 2022-06-21 | 山东交通学院 | Annular shunting accelerated loading environment cabin |
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Address after: 212132 Dagang Port, Zhenjiang New District, Zhenjiang, Jiangsu Patentee after: Jiangsu Tiannuo Road Material Co.,Ltd. Address before: 212132 Dagang Port, Zhenjiang New District, Zhenjiang, Jiangsu Patentee before: JIANGSU TIANNUO ROAD MATERIALS TECHNOLOGY Co.,Ltd. |
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