A multi-mode inorganic binder stabilized material anti-scour tester

Abstract

The present invention discloses a multi-mode inorganic binder stabilized material anti-scour tester, including a control system, an instrument housing, a driving device, a liquid storage chamber and a pressure head, wherein the pressure head is arranged on the upper part of the liquid storage chamber and connected to the driving device, and a fixed bracket for fixing the test piece is also arranged in the liquid storage chamber; a closed capsule is arranged on the pressure head, the closed capsule is provided with a scouring hole, and the closed capsule is also provided with a fixing device, and the closed capsule completely wraps the test piece through the fixing device. The present invention provides a variety of load action modes for different pavement structures, and the closed capsule is wrapped around the test piece. The closed capsule can realize the suction and pressure discharge of water in the liquid storage chamber under the drive of the pressure head, and produce scouring and pumping effects on the internal test piece, and the test process is more consistent with the actual material environment. In addition, after the scouring is completed, the test piece can be directly dried and weighed by an electric heating wire and a weighing table, which not only simplifies the operation process, but also reduces the error caused by material transfer.

Description

Technical Field

[0001] The invention relates to the technical field of material anti-scour performance detection, and in particular to a testing device for anti-scour of inorganic binder stabilized materials. Background Art

[0002] Inorganic binder stabilized materials, such as cement stabilized gravel, are widely used in road base structures due to their strong bearing capacity and convenient construction. According to the results of a large number of engineering case studies, damage to some pavement structures is not caused by the strength of the pavement base material not meeting the load requirements, but due to poor road performance such as the scouring resistance of the base material. Therefore, it is particularly important to test the scouring resistance of inorganic binder stabilized materials.

[0003] At present, the commonly used anti-scouring tester needs to rely on MTS and other equipment to provide scouring load. The pressure head acts on the top of the specimen repeatedly to simulate the wheel load of the actual pavement structure. The pressure head drives the water flow to move, and the grooves on the rubber pad on the pressure head realize the scouring effect of water on the inorganic binder stabilized material under the load. Then, the anti-scouring performance of the material is evaluated according to the scouring effect of the water flow and the change in the mass of the specimen under the action of the pressure head.

[0004] However, the traditional test method is not consistent with the actual scouring effect on the base material. It can only simulate the situation where the surface material is damaged and cracks are generated, causing the top surface of the base to be scoured by water flow, but it cannot simulate the impact of water flow scouring on the base material under the through-type cracks in the base. When through-type cracks appear in the base, the entire section of the base material will be affected by the scouring effect of water flow, and the impact of scouring on the material performance will be more significant. Figure 4 As shown. For different pavement structures, the load size transferred to the base layer is also different. It is obviously not accurate enough to test the anti-scouring performance of the base layer of all pavement structures only by the same test load. Moreover, the scouring effect on the base material under the actual driving load is divided into two effects: scouring and pumping. The traditional test method can only simulate the scouring effect by driving the liquid flow through the pressure head, and simulate the pumping effect through the groove of the rubber on the top of the pressure head. The main mass loss of the test comes from the pressure head load rather than the scouring effect of the liquid. This method is seriously inconsistent with the strong pumping effect of the base layer in the semi-closed working environment under the actual load. In addition, after the scouring effect is over, the traditional experimental method needs to transfer the test liquid to an evaporating dish for drying, measure the mass of fine aggregate in the liquid, and evaluate the scouring performance. A small amount of fine aggregate is very easy to adhere to the test instrument, and mass loss is easy to occur during the secondary transfer process, which further affects the accuracy of the anti-scouring performance test. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a multi-mode inorganic binder stabilized material anti-scouring tester that fully simulates the scouring and pumping action process of the base material under the action of water flow through a sealing bag, so that the test effect is more in line with the actual action state and the detection result is more accurate.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: a multi-mode inorganic binder stabilized material anti-scour tester, including a control system, an instrument housing, a driving device, a liquid storage chamber and a pressure head, the driving device and the liquid storage chamber are arranged in the housing, the pressure head is arranged at the upper part of the liquid storage chamber and is connected to the driving device to form a structure that can move up and down, a fixed bracket for fixing the test piece is also arranged in the liquid storage chamber, a flexible closed capsule is arranged on the pressure head, and a flushing hole for liquid in and out is arranged on the side wall of the closed capsule, and the closed capsule is also provided with a fixing device, through the fixing of the fixing device, the closed capsule completely wraps the test piece, and the water in the liquid storage chamber is sucked and discharged through the flushing hole, so as to flush and pump the test piece.

[0007] Furthermore, a weighing platform is arranged in the liquid storage chamber, the fixing bracket is arranged on the weighing platform, and the test piece is fixed on the weighing platform by locking the fixing bolts on the fixing bracket.

[0008] Furthermore, the fixing device arranged on the closed bag is a fixing ring with a closing bolt, and the fixing ring is arranged at the lower part of the closed bag. After the specimen is inserted into the closed bag, the fixing ring is tightly clamped around the weighing platform by locking the closing bolt to wrap the specimen inside, thereby forming a semi-closed environment for the closed bag. Driven by the pressure head, the closed bag sucks and discharges the water in the liquid storage chamber, and the water enters and exits the closed bag through the flushing hole to flush the specimen, simulating the flushing and pumping effects.

[0009] Furthermore, the driving device includes a multi-frequency motor, which is installed on a lifting mechanism. The transmission shaft of the multi-frequency motor is connected to an eccentric block to form a structure for applying a vibration load to the test piece; the pressure head is installed at the bottom end of a connecting rod, which is connected and fixed to the multi-frequency motor.

[0010] Furthermore, the lifting mechanism includes a lifting motor, which is installed on the top of the shell, and the lifting motor is connected to a crossbeam through a steel strand, and the two ends of the crossbeam are respectively installed on the lifting guide beam, and the lifting guide beam is installed in the shell; the multi-frequency motor is installed on the crossbeam. During the test, the multi-frequency motor drives the eccentric block to rotate to provide a vibration load; the lifting motor drives the crossbeam to move up and down along the lifting guide beam in the vertical direction, and the crossbeam is driven by the lifting motor to lift or lower through the steel strand, thereby controlling the position of the pressure head; during the test, the pressure head moves up and down with the multi-frequency motor as a whole, thereby applying a vibration load to the test piece.

[0011] Furthermore, a heating wire is provided on the side wall of the liquid storage chamber to form a drying mechanism for the specimen after the scouring test. When the scouring process is completed and the water is discharged from the liquid storage chamber, the specimen is heated by the heating wire to evaporate the water; after the specimen is completely dried, the mass of the specimen after the scouring action is measured by the weighing platform at the bottom, and the anti-scouring performance of the material is evaluated according to the mass loss of the specimen before and after the scouring action;

[0012] Furthermore, a drain port and a rubber plug matching the drain port are provided at the bottom of one side of the liquid storage chamber, and a drainage conduit is connected to the lower part of the drain port for directly discharging water after flushing.

[0013] Furthermore, a rubber pad for contacting the test piece is provided at the bottom of the pressure head to prevent damage to the test piece.

[0014] Furthermore, it also includes a fixed base, on which the shell, liquid storage chamber and weighing platform are all arranged, and the control system includes a control panel, which is arranged on the front of the fixed base. The test parameters can be set through the control panel, and the pressure head can be controlled to rise and fall during the test. When the test simulates the stress of cement concrete pavement base material, the pressure head pressure is set to 0.1MPa; when the test simulates the stress of asphalt mixture pavement base material, the pressure head pressure is set to 0.7MPa; the number of load actions is set according to the road traffic volume.

[0015] Preferably, the sealing bag is made of rubber material, which has low cost, good sealing effect, wear resistance and durability.

[0016] The present invention sets different load action modes for different surface structures, so that the anti-scouring performance of the base materials of different paving structures can be detected more accurately; by setting a closed bag around the test piece, the closed bag can realize the suction and pressure discharge of water in the liquid storage cavity under the drive of the pressure head, thereby producing a scouring and pumping effect on the internal test piece, and the test process is more consistent with the actual material environment. In addition, after the scouring is completed, the test piece can be directly dried and weighed by the electric heating wire and the weighing table, and the anti-scouring performance of the material can be evaluated by calculating the mass difference of the test piece, which not only simplifies the test operation of measuring the mass of fine particles dissolved in water in the traditional method, but also reduces the error caused by the loss amount during the transfer of fine particles.

[0017] Therefore, the present invention can better simulate the scouring effect of different pavement structure base materials, the equipment is simple in structure, the test steps are simple, the operation is convenient, and the equipment runs stably and safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the cooperation between the sealing capsule and the fixing bracket;

[0020] Figure 3 is a schematic diagram of the pressure head;

[0021] Figure 4 Figure a is a schematic diagram of non-penetrating scour, and figure b is a schematic diagram of penetrating scour.

[0022] In the figure, 1 is a shell, 2 is a lifting motor, 3 is a lifting guide beam, 4 is a cross beam, 5 is a connecting rod, 6 is a liquid storage chamber, 7 is a control panel, 8 is a fixed base, 9 is a conduit, 10 is a drain outlet, 11 is a weighing platform, 12 is a fixing bolt, 13 is a fixing bracket, 14 is a closing bolt, 15 is a closing capsule, 16 is a flushing hole, 17 is a pressure head, 18 is a multi-frequency motor, 19 is an eccentric block, 20 is a steel strand, 21 is a heating wire, and 22 is a rubber pad. DETAILED DESCRIPTION

[0023] The present invention will be further described below by means of specific embodiments in conjunction with the accompanying drawings:

[0024] In this embodiment, refer to Figure 1 , Figure 2 and Figure 3 The multi-mode inorganic binder stabilized material anti-scour tester includes a control system, an instrument shell 1, a driving device, a liquid storage chamber 6 and a pressure head 17. The driving device and the liquid storage chamber 6 are arranged in the shell 1, and the pressure head 17 is arranged on the upper part of the liquid storage chamber 6 and connected to the driving device to form a structure that can move up and down. A fixed bracket 13 for fixing the test piece is also arranged in the liquid storage chamber 6; a flexible closed capsule 15 is arranged on the pressure head 17, and a scouring hole 16 for liquid in and out is arranged on the side wall of the closed capsule 15. The closed capsule 15 is also provided with a fixing device, and the closed capsule 15 is fixed by the fixing device to completely wrap the test piece, and a scouring and pumping structure for sucking and discharging water in the liquid storage chamber 6 is formed through the scouring hole 16.

[0025] A weighing platform 11 is arranged in the liquid storage chamber 6, and the fixing bracket 13 is arranged on the weighing platform 11. The test piece is fixed on the weighing platform 11 by locking the fixing bolts 12 on the fixing bracket 13, so that weighing can be performed directly. The weighing platform 11 can be a waterproof mechanical scale or a waterproof electronic scale.

[0026] The fixing device arranged on the closed capsule 15 is a fixing ring (or a hoop) with a closing bolt 14. The fixing ring is arranged at the lower part of the closed capsule 15. After the specimen is inserted into the closed capsule 15, the fixing ring is tightly clamped around the weighing platform 11 by locking the closing bolt 14 to wrap the specimen inside, so that the closed capsule 15 forms a semi-closed environment. Driven by the pressure head 17, the closed capsule 15 sucks and discharges the water in the liquid storage chamber 6. The water enters and exits the closed capsule 15 through the flushing hole 16 to flush the specimen, simulating the flushing and pumping effects.

[0027] The driving device includes a multi-frequency motor 18, which is installed on a lifting mechanism. The transmission shaft of the multi-frequency motor 18 is connected to an eccentric block 19 to form a structure for applying a vibration load to the test piece; the pressure head 17 is installed at the bottom end of a connecting rod 5, and the connecting rod 5 is connected and fixed to the multi-frequency motor 18.

[0028] The lifting mechanism includes a lifting motor 2, which is installed on the top of the housing 1. The lifting motor 2 is connected to a crossbeam 4 through a steel strand 20. Both ends of the crossbeam 4 are respectively installed on a lifting guide beam 3, which is installed in the housing 1. A multi-frequency motor 18 is installed on the crossbeam 4. During the test, the multi-frequency motor 18 drives the eccentric block 19 to rotate, thereby providing a vibration load; the lifting motor 2 drives the crossbeam to move up and down along the lifting guide beam 3 in the vertical direction, and the crossbeam 4 is driven by the lifting motor 2 to lift or lower through the steel strand 20, thereby controlling the position of the pressure head 17; during the test, the pressure head 17 moves up and down as a whole with the multi-frequency motor 18, thereby applying a vibration load to the test piece.

[0029] A heating wire is arranged on the side wall of the liquid storage chamber 6 to form a drying mechanism for the specimen after the scouring test. When the scouring process is completed and the water is discharged from the liquid storage chamber 6, the specimen is heated by the heating wire 21 to evaporate the water; after the specimen is completely dried, the mass of the specimen after the scouring action is measured by the weighing platform 11 at the bottom, and the anti-scouring performance of the material is evaluated according to the mass loss of the specimen before and after the scouring action;

[0030] A drain port 10 and a rubber plug matching the drain port 10 are provided at the bottom of one side of the liquid storage chamber 6. A drainage conduit 9 is connected to the lower part of the drain port 10 for directly draining water after flushing.

[0031] A rubber pad 22 for contacting the test piece is provided at the bottom of the pressure head 17 to prevent the test piece from being damaged.

[0032] It also includes a fixed base 8, on which the housing 1, the liquid storage chamber 6 and the weighing platform 11 are all arranged, and the control system includes a control panel 7, which is arranged on the front of the fixed base 8. The control panel 7 can be used to set the test parameters and control the lifting and lowering of the pressure head 17 during the test. When the test simulates the stress of the cement concrete pavement base material, the pressure of the pressure head 17 is set to 0.1MPa; when the test simulates the stress of the asphalt mixture pavement base material, the pressure of the pressure head 17 is set to 0.7MPa; the number of load actions is set according to the road traffic volume.

[0033] The sealing bag 15 is made of rubber material, which has low cost, good sealing effect, wear resistance and durability.

[0034] Working process: the test piece of standard size is formed according to the specification requirements, and after the standard condition curing is completed, the test piece is placed on the weighing platform 11 to weigh the mass of the test piece. After the weighing is completed, the test piece is fixed by the fixing bracket 13 and the fixing bolt 14; the lifting motor 2 is controlled by the control panel 7 to lower the crossbeam 4 together with the pressure head 17, so that the rubber pad 22 at the bottom of the pressure head 17 is in full contact with the top surface of the test piece, and the steel strand 20 is in a relaxed state; the sealing capsule 15 at the bottom of the pressure head 17 is lowered to completely seal the test piece, and the sealing capsule 15 is fixed on the weighing platform 11 by the sealing bolt 14 at the bottom of the sealing capsule 15; an appropriate amount of water is added to the liquid storage chamber 6 to make the water level higher than the top surface of the test piece. According to the pavement structure and the actual load action, the load parameters and the number of actions are set through the control panel 7. For cement concrete pavement, the pressure head load is 0.1MPa, and for asphalt mixture pavement, the pressure head load is 0.7MPa. After the test parameters are set, the multi-frequency motor 18 is started to carry out the flushing test.

[0035] When the instrument is finished, open the closing bolt 14 and lift the pressure head 17 to an appropriate height through the control panel 7, open the water outlet 10 to discharge the water in the liquid storage chamber 6 through the conduit 9; open the fixing bolt 12, start the heating wire 21 through the control panel 7 to heat and dry the specimen, and measure the mass of the specimen through the weighing platform 11. When the mass reading of the specimen no longer changes after heating, the specimen is completely dried. Record the mass of the specimen at this time, and calculate the mass loss of the specimen in combination with the mass test result before scouring, so as to evaluate the anti-scouring performance of the mixture.

[0036] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present application. That is, all equivalent changes and modifications made within the scope of the present application should still fall within the scope of the present invention.

Claims

1. A multi-mode inorganic binder stabilized material anti-scour tester, comprising a control system, an instrument housing, a driving device, a liquid storage chamber and a pressure head, wherein the driving device and the liquid storage chamber are arranged in the housing, the pressure head is arranged on the upper part of the liquid storage chamber and connected to the driving device to form a structure that can move up and down, and a fixing bracket for fixing the test piece is also arranged in the liquid storage chamber, characterized in that: A flexible closing capsule is arranged on the pressure head, and a flushing hole for liquid to enter and exit is arranged on the closing capsule. The closing capsule is also provided with a fixing device, and the closing capsule is fixed with the fixing device so that the test piece is completely wrapped. A flushing and pumping structure for sucking and discharging water in the liquid storage cavity is formed through the flushing hole.

2. The multi-mode inorganic binder stabilized material anti-scour tester according to claim 1, characterized in that: A weighing platform is arranged in the liquid storage cavity, and the fixing bracket is arranged on the weighing platform. The test piece is fixed on the weighing platform by locking the fixing bolts on the fixing bracket.

3. The multi-mode inorganic binder stabilized material anti-scour tester according to claim 2, characterized in that: The fixing device arranged on the closed bag is a fixing ring with a closing bolt, and the fixing ring is arranged at the lower part of the closed bag. After the test piece is inserted into the closed bag, the fixing ring is tightly clamped around the weighing platform by locking the closing bolt to wrap the test piece inside.

4. The multi-mode inorganic binder stabilized material anti-scour tester according to claim 1, characterized in that: The driving device comprises a multi-frequency motor, which is mounted on a lifting mechanism, and a transmission shaft of the multi-frequency motor is connected to an eccentric block to form a structure for applying a vibration load to the test piece; The pressure head is installed at the bottom end of a connecting rod, and the connecting rod is connected and fixed with the multi-frequency motor.

5. The multi-mode inorganic binder stabilized material anti-scour tester according to claim 4, characterized in that: The lifting mechanism includes a lifting motor, which is installed on the top of the shell. The lifting motor is connected to a crossbeam through a steel strand. Both ends of the crossbeam are respectively installed on a lifting guide beam, and the lifting guide beam is installed in the shell; the multi-frequency motor is installed on the crossbeam.

6. The multi-mode inorganic binder stabilized material anti-scour tester according to claim 1, characterized in that: An electric heating wire is arranged on the side wall of the liquid storage cavity to form a baking mechanism for the test piece after the flushing test.

7. The multi-mode inorganic binder stabilized material anti-scour tester according to claim 1, characterized in that: A drainage port and a rubber plug matched with the drainage port are arranged at the bottom of one side of the liquid storage cavity, and a drainage conduit is connected to the lower part of the drainage port.

8. The multi-mode inorganic binder stabilized material anti-scour tester according to claim 1, characterized in that: A rubber pad for contacting the test piece is arranged at the bottom of the pressure head.

9. The multi-mode inorganic binder stabilized material anti-scour tester according to claim 2, characterized in that: The device also includes a fixed base, on which the shell, the liquid storage chamber and the weighing platform are all arranged. The control system includes a control panel, which is arranged on the front side of the fixed base.

10. The multi-mode inorganic binder stabilized material anti-scour tester according to claim 1, characterized in that: The sealing bag is made of rubber material.

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