CN115656004A - Asphalt concrete deformation test device and method - Google Patents
Asphalt concrete deformation test device and method Download PDFInfo
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- CN115656004A CN115656004A CN202211314275.3A CN202211314275A CN115656004A CN 115656004 A CN115656004 A CN 115656004A CN 202211314275 A CN202211314275 A CN 202211314275A CN 115656004 A CN115656004 A CN 115656004A
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- asphalt concrete
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Abstract
The invention discloses an asphalt concrete deformation test device which comprises a pressure chamber, a water pressing cylinder, a servo motor and a pressure head, wherein water and a piece to be tested are arranged in the pressure chamber, the pressure head is arranged at the top in the pressure chamber in a penetrating mode, the pressure chamber is connected with the water pressing cylinder through a copper pipe, a piston is arranged in the water pressing cylinder and connected with the servo motor, and the piston is sleeved on the outer surface of the output end of the servo motor. Has the advantages that: the method can measure the volume change of the asphalt concrete in the deformation process, know whether the porosity of the specific asphalt concrete exceeds 3 percent, the size of the volume change and the development process, provide a judgment basis for engineering personnel and have high accuracy of the test result.
Description
Technical Field
The invention relates to the technical field of asphalt concrete seepage prevention in hydraulic and hydroelectric engineering, in particular to an asphalt concrete deformation test device and method.
Background
The asphalt concrete has excellent seepage-proofing performance and foundation deformation adaptability, and is widely applied to various water conservancy and hydropower seepage-proofing projects, wherein an asphalt concrete core wall dam is one of application forms, the asphalt concrete core wall can deform due to foundation settlement, water pressure and other reasons during construction and operation, and the volume of the asphalt concrete can change in the deformation process, so that the porosity of the asphalt concrete changes. The core condition for asphalt concrete barrier is that its porosity is less than 3%, and once it exceeds 3% due to deformation of asphalt concrete, it may cause failure of the asphalt concrete barrier, with even more serious consequences. Therefore, the volume change of the asphalt concrete during the deformation process must be known through experiments.
At present, no known and unified method is used for measuring the volume change of the asphalt concrete in the deformation process, and therefore, the invention designs the test device and the method for measuring the volume change of the asphalt concrete in the deformation process so as to solve the problems.
Disclosure of Invention
Aiming at the problems in the related art, the invention provides an asphalt concrete deformation test device and method, which can know the volume change and the development process of asphalt concrete in the deformation process and provide a judgment basis for engineering personnel.
In order to achieve the purpose, the invention provides the following technical scheme:
according to one aspect of the invention, an asphalt concrete deformation test device is provided.
The asphalt concrete deformation test device comprises a pressure chamber, a water pressing cylinder, a servo motor and a pressure head; the pressure chamber is internally provided with water and a test piece to be tested, the top of the pressure chamber is provided with the pressure head in a penetrating mode, the pressure chamber is connected with the pressure cylinder through a copper pipe, a piston is arranged in the pressure cylinder and connected with the servo motor, and the piston sleeve is arranged on the outer surface of the output end of the servo motor.
The pressure chamber the pressure jar all fixes the top that is equipped with the workstation, just the workstation is inside to have the cavity, servo motor fixes the interior top of workstation.
The liquid level probe is fixedly arranged at the top end of the pressure chamber in a penetrating mode, and a water inlet pipeline with a control valve is arranged at the top end of the pressure chamber.
According to another aspect of the present invention, an asphalt concrete deformation test method is provided.
The asphalt concrete deformation test method comprises the following steps:
placing the test piece of asphalt concrete into the pressure chamber;
water is added into the pressure chamber through a water inlet pipeline, so that the liquid level and the liquid level probe are in a state of just contacting;
the pressing head is pressed down to enable the to-be-tested piece of the asphalt concrete to deform, and the liquid level gradually rises;
when the liquid level probe contacts water, the servo motor is switched on and drives the piston in the pressure water cylinder to descend, the water in the pressure chamber is pumped into the pressure water cylinder, the liquid level in the pressure chamber descends, and when the liquid level descends to be separated from the liquid level probe, the servo motor is powered off, and water pumping is stopped.
Has the beneficial effects that:
the method can measure the volume change of the asphalt concrete in the deformation process, know whether the porosity of the specific asphalt concrete exceeds 3 percent, the size of the volume change and the development process, provide a judgment basis for engineering personnel and have high accuracy of the test result.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a front view of an asphalt concrete deformation test apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic front view of an asphalt concrete deformation test apparatus according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of an asphalt concrete deformation test method according to an embodiment of the invention.
In the figure:
1. a pressure chamber; 2. a water pressing cylinder; 3. a servo motor; 4. a pressure head; 5. a test piece to be tested; 6. a copper tube; 7. a piston; 8. a work table; 9. a liquid level probe.
Detailed Description
The invention is further described with reference to the following drawings and detailed description: in order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein and, therefore, the present invention is not limited to the specific embodiments disclosed in the following description.
As shown in fig. 1-2, an asphalt concrete deformation testing device according to an embodiment of the present invention includes a pressure chamber 1, a water pressing cylinder 2, a servo motor 3, and a pressing head 4; be provided with water and treat test piece 5 in the pressure chamber 1, just the top run-through type is equipped with in the pressure chamber 1 pressure head 4, pressure chamber 1 with press jar 2 to pass through copper pipe 6 and connect, press 2 interior settings of jar piston 7 with servo motor 3 connects, just piston 7 cover is established on servo motor 3's the output surface. Pressure chamber 1 the pressure jar 2 all fixes the top that is equipped with workstation 8, just workstation 8 is inside to have a cavity, servo motor 3 is fixed the interior top of workstation 8. A liquid level probe 9 is fixedly arranged at the top end of the pressure chamber 1 in a penetrating mode, and a water inlet pipeline with a control valve is arranged at the top end of the pressure chamber 1.
As shown in fig. 3, in specific use, the steps of the asphalt concrete deformation test include: firstly, putting the to-be-tested piece 5 of asphalt concrete into the pressure chamber 1; step two, adding water into the pressure chamber 1 through a water inlet pipeline to enable the liquid level to be in a state of just contacting with the liquid level probe 9; thirdly, the pressure head 4 is pressed down to enable the asphalt concrete to-be-tested piece 5 to be deformed, and the liquid level is gradually increased; and step four, when the liquid level probe 9 contacts water, the servo motor 3 is switched on, the piston 7 in the pressure water cylinder 2 is driven to descend, water in the pressure chamber 1 is pumped into the pressure water cylinder 2, the liquid level in the pressure chamber 1 descends, and when the liquid level descends to be separated from the liquid level probe 9, the servo motor 3 is switched off, and water pumping is stopped.
In specific application, acquiring a pressure head displacement value S1 and a piston displacement value S2 at different moments t, and calculating according to the pressure head radius R1 and the piston radius R2 and the following formula to obtain the volume change of the asphalt concrete test piece at different moments; v (t) = π R2 2 *S2-πR1 2 * S1; calculating the volume change of the asphalt concrete test piece under a certain deformation, verifying whether the porosity of the asphalt concrete test piece exceeds 3%, and judging whether the asphalt concrete seepage prevention fails; to make a juiceThe green concrete piece to be tested is obtained by indoor molding or on-site coring. And the ram is loaded at a set loading rate.
In the practical application process, the method can measure the volume change of the asphalt concrete in the deformation process, know whether the porosity of the specific asphalt concrete exceeds 3 percent, and know the size and the development process of the volume change, provide a judgment basis for engineering personnel, and has high accuracy of the test result.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The asphalt concrete deformation test device is characterized by comprising a pressure chamber (1), a water pressing cylinder (2), a servo motor (3) and a pressure head (4);
wherein, be provided with water in pressure chamber (1) and treat test piece (5), just top run-through type is equipped with in pressure chamber (1) pressure head (4), pressure chamber (1) with press jar (2) to connect through copper pipe (6), set up in press jar (2) piston (7) with servo motor (3) are connected, just piston (7) cover is established on the output surface of servo motor (3).
2. The asphalt concrete deformation test device according to claim 1, characterized in that the pressure chamber (1) and the water pressing cylinder (2) are both fixedly provided with the top end of a workbench (8), a cavity is arranged inside the workbench (8), and the servo motor (3) is fixed at the inner top end of the workbench (8).
3. The asphalt concrete deformation test device according to claim 2, wherein a liquid level probe (9) is fixedly arranged at the top end of the pressure chamber (1) in a penetrating manner, and a water inlet pipeline with a control valve is arranged at the top end of the pressure chamber (1).
4. The asphalt concrete deformation test method is characterized by comprising the following steps:
placing the test piece (5) of asphalt concrete into the pressure chamber (1);
water is added into the pressure chamber (1) through a water inlet pipeline, so that the liquid level and the liquid level probe (9) are just in contact;
the pressure head (4) is pressed down to enable the to-be-tested piece (5) of the asphalt concrete to deform, and the liquid level gradually rises;
when the liquid level probe (9) contacts water, the servo motor (3) is switched on and drives the piston (7) in the pressure water cylinder (2) to descend, the water in the pressure chamber (1) is pumped into the pressure water cylinder (2) to descend the liquid level in the pressure chamber (1), and when the liquid level descends to be separated from the liquid level probe (9), the servo motor (3) is powered off and the water pumping is stopped.
5. The asphalt concrete deformation test method according to claim 4, characterized in that the indenter displacement value S1 and the piston displacement value S2 at different moments t are collected, and the volume change of the asphalt concrete sample at different moments can be obtained by calculating according to the following formula according to the indenter radius R1 and the piston radius R2;
V(t)＝πR2 2 *S2-πR1 2 *S1；
calculating the volume change of the asphalt concrete test piece under a certain deformation, verifying whether the porosity of the asphalt concrete test piece exceeds 3%, and judging whether the asphalt concrete seepage prevention fails;
the piece (5) to be tested of bituminous concrete is obtained by indoor forming or by coring on site.
6. An asphalt concrete deformation test method according to claim 5, characterized in that the ram (4) is loaded at a set loading rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211314275.3A CN115656004A (en) | 2022-10-25 | 2022-10-25 | Asphalt concrete deformation test device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211314275.3A CN115656004A (en) | 2022-10-25 | 2022-10-25 | Asphalt concrete deformation test device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115656004A true CN115656004A (en) | 2023-01-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211314275.3A Pending CN115656004A (en) | 2022-10-25 | 2022-10-25 | Asphalt concrete deformation test device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115656004A (en) |
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2022
- 2022-10-25 CN CN202211314275.3A patent/CN115656004A/en active Pending
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