CN107655778B - Two-phase rolling and flushing instrument for programmable water-stabilized macadam base - Google Patents
Two-phase rolling and flushing instrument for programmable water-stabilized macadam base Download PDFInfo
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- CN107655778B CN107655778B CN201711148872.2A CN201711148872A CN107655778B CN 107655778 B CN107655778 B CN 107655778B CN 201711148872 A CN201711148872 A CN 201711148872A CN 107655778 B CN107655778 B CN 107655778B
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- 238000011010 flushing procedure Methods 0.000 title claims abstract description 79
- 238000005096 rolling process Methods 0.000 title claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 abstract description 13
- 230000003628 erosive effect Effects 0.000 abstract description 5
- 230000003204 osmotic effect Effects 0.000 abstract description 5
- 238000004088 simulation Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 48
- 238000009991 scouring Methods 0.000 description 36
- 150000003839 salts Chemical class 0.000 description 13
- 239000000463 material Substances 0.000 description 9
- 238000011156 evaluation Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000005086 pumping Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000009490 roller compaction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
- G01N3/567—Investigating resistance to wear or abrasion by submitting the specimen to the action of a fluid or of a fluidised material, e.g. cavitation, jet abrasion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
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- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a programmable water-stabilized macadam base two-phase rolling and flushing instrument, which comprises a water-stabilized macadam base flushing control water tank, wherein the water-stabilized macadam base flushing control water tank is connected with a two-phase rolling and flushing chamber; the water tank is controlled to provide liquid for the two-phase rolling flushing chamber through the water-stabilized macadam base flushing, so that experimental simulation completely accords with actual road flushing conditions, and the experimental structure is more similar to the actual road flushing; the device comprehensively considers factors such as load, solid-liquid two-phase action, temperature, osmotic pressure, erosion action and the like, and is more comprehensive and scientific than the prior device.
Description
Technical Field
The invention belongs to the technical field of performance test of road engineering materials, and relates to a programmable water-stabilized macadam base two-phase rolling scouring instrument.
Background
The water-stabilized macadam base has higher strength, rigidity and bearing capacity, and good fatigue resistance, and is a pavement structure which is most widely used in China at present. However, as the road is put into use, the defects of early cracking, board bottom void and the like of the road caused by insufficient anti-scouring performance of the road surface of the water-stabilized macadam base layer often occur, so that the use function of the road is affected, the service level and the service life of the road surface are greatly reduced, and the cost of the whole life cycle of the road surface is increased. Therefore, it is necessary to design an effective and convenient device for testing the scouring resistance of the water-stabilized macadam base.
Through consulting the literature, the related patents of the existing test device for evaluating the scouring resistance of the water-stabilized macadam foundation mainly comprise the following:
CN 203658190U, by simulating the void ponding concrete pavement slab, generates micro-deflection deformation extrusion water flow level to radially flush the fine material on the top surface of the base layer under the action of vehicle load, and comprehensively evaluates the anti-scouring capability of the cement pavement base layer material by using the two indexes of the mass loss rate of the test piece with the pressure flow rate specified by the preset flushing time and the maximum flushing depth.
CN104198367a proposes to suspend the test piece, to simulate the scouring action of water flow on the test piece by rotating clockwise and anticlockwise rotating blades under the test piece, and to use the ratio of the scouring mass and the total mass of the test piece as the index of evaluating the anti-scouring material.
CN103344517a proposes that in the pressure chamber of the dynamic triaxial apparatus, the scouring action of the dynamic water pressure on the material is simulated by the axial pressurization system, the confining pressure system, the adjustable frequency and pressure, the dynamic water pressure generation and other factors.
CN102183452B proposes that the material is flushed by factors such as flushing water pressure, flushing times, flushing frequency, flushing angle, etc.
The existing test device for evaluating the scouring resistance of the water-stabilized macadam base has the defects that the device is too complex and is not beneficial to popularization and application of actual engineering; considering incomplete test variables, the simulation effect of water on material scouring is not simulated more truly; the evaluation index is unreasonable, and the influence of long-term scouring is not fully considered. When the water-stabilized macadam base is subjected to scouring action, the magnitude and frequency of dynamic load of the wheels, the flow velocity, flow rate, angle and scouring time of flowing water, the salt content of the flowing water, the solid-liquid two-phase comprehensive action, the temperature stress in the base, the plate bottom void action, the pumping action on the top surface of the base, the forming method, dry weight and wet weight of a test piece and other factors are comprehensively considered, and the water-stabilized macadam base is different from the actual situation that the water-stabilized macadam base is subjected to multiple actions and is damaged under the main action of water in reality.
Disclosure of Invention
The invention aims to provide a programmable two-phase rolling scouring instrument for a water-stabilized macadam base, which solves the defects that the device is too complex and the test variable is not fully considered in the existing test device for evaluating the scouring resistance of the water-stabilized macadam base.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a programmable water-stabilized macadam base two-phase rolling and flushing instrument which comprises a water-stabilized macadam base flushing control water tank, a water flow circulation tank and a two-phase rolling and flushing chamber, wherein the water-stabilized macadam base flushing control water tank is connected with the two-phase rolling and flushing chamber through the water flow circulation tank.
Preferably, the water-stabilized macadam base flushing control water tank comprises a water tank body, wherein a feed door and a temperature control system for measuring and controlling the water temperature in the water tank are arranged on the water tank body, and the feed door is arranged at the top of the water tank body.
Preferably, the temperature control system includes a thermocouple, a heating resistor plate, a display, and a heating control button, wherein the heating resistor plate is disposed at the bottom of the water tank body.
Preferably, the water flow circulation box comprises a circulation box body, and a filter screen is arranged in the inner cavity of the circulation box body.
Preferably, the two rolling flushing chambers comprise a flushing chamber body, a partition plate, a bearing table, a rolling device and a power control system, wherein the partition plate is fixed in the flushing chamber body to divide the flushing chamber body into an upper part and a lower part; the bearing platform is arranged in the middle of the partition plate, the bottom of the bearing platform is communicated with the middle of the partition plate, and meanwhile, a rubber net pad is arranged at the bottom of the bearing platform; the rolling device is arranged right above the bearing platform and is powered by the power control system.
Preferably, the rolling device comprises a rolling wheel and a rotary brush, wherein the two rotary brushes are respectively arranged on two sides of the rolling wheel, and meanwhile, the rotary brush and the rolling wheel are connected with the power control system through connecting rods.
Preferably, the direction of rotation of the rotating brush is opposite to the direction of rotation of the grinding wheel.
Preferably, the power control system is also connected with a control button and a pressure display.
Preferably, a feeding hopper for adding solid particles into the flushing box is arranged on the flushing chamber body, and a valve is arranged on the feeding hopper.
Preferably, the water-stabilized macadam base flushing control water tank is respectively connected with the water flow circulation tank, the upper parts of the two rolling flushing chambers and the lower parts of the two rolling flushing chambers through the guide pipe; the upper parts of the two rolling flushing chambers are connected with the water flow circulation box through diversion trenches.
In contrast to the prior art, the method has the advantages that, the beneficial effects of the invention are as follows:
according to the two-item rolling and flushing instrument for the programmable water-stabilized macadam base, provided by the invention, liquid is provided for the two-phase rolling and flushing chamber through the water-stabilized macadam base flushing control water tank, so that experimental simulation completely accords with actual road flushing conditions, and the experimental structure is more similar to actual road flushing. In actual road flushing, the solid and the liquid are always the same and act on the road surface, and not only have the effect of water; in addition, the temperature and the osmotic pressure of the bottom and the top of the plate are also generally different, for example, after deicing salt is scattered in winter, the salt concentration of pavement water flow is high, the temperature is lower, and when the pavement is subjected to water flow scouring, the pavement is also generally subjected to salt erosion; the device comprehensively considers factors such as load, solid-liquid two-phase action, temperature, osmotic pressure, erosion action and the like, and is more comprehensive and scientific than the prior device.
Furthermore, the temperature control system arranged on the water-stabilized macadam base flushing control water tank can control the temperature requirement of the liquid environment required in the experimental process.
Drawings
FIG. 1 is a schematic illustration of a test piece;
FIG. 2 is a schematic diagram of a water-stabilized macadam foundation flush control tank;
FIG. 3 is a schematic view of a water circulation tank;
FIG. 4 is a schematic view of a water circulation tank;
wherein, 1, water tank body 2, circulation case body 3, wash room body 4, division board 5, support piece platform 6, rolling wheel 7, rotatory brush 8, power control system 9, control button 10, pressure display 101, feed gate 102, thermocouple 103, heating resistance plate 104, display 105, heating control button 201, filter screen 202, first guiding gutter 301, feeder hopper 302, second guiding gutter.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to design an effective, convenient and comprehensive device for testing the scour resistance of a water-stabilized macadam base and provide a more reasonable evaluation index, the device, the method and the evaluation index for testing the scour resistance of the water-stabilized macadam base material are required to be developed so as to comprehensively evaluate the scour resistance of the water-stabilized macadam base material, and the following 4 requirements are provided:
(1) The test device must be capable of well simulating the acting force of the vehicle load on the water-stabilized macadam foundation;
(2) The test device must be capable of well simulating the scouring action of water on the water-stabilized macadam base;
(3) The test device must take into account temperature stress, salt washout and pumping action;
(4) Reasonable evaluation indexes must be proposed.
As shown in fig. 1 to 3, the two rolling and flushing instruments for the programmable water-stabilized macadam base provided by the invention comprise a water-stabilized macadam base flushing control water tank, a water flow circulation tank and two-phase rolling and flushing chambers, wherein the water-stabilized macadam base flushing control water tank is connected with the two-phase rolling and flushing chambers through the water flow circulation tank.
The water-stabilized macadam base flushing control water tank is used for controlling water flow circulation of the whole system and water temperature difference and salt concentration required by experiments. Comprises a water tank body 1, wherein the water tank body 1 is of a cubic structure of 1m multiplied by 1 m. The water tank body 1 is provided with a feeding door 101 and a temperature control system, wherein the feeding door 101 is arranged at the top of the water tank body 1.
The water temperature control system for measuring and controlling the temperature of water in the water tank includes a thermocouple 102, a heating resistor plate 103, a display 104, and a heating control button 105, wherein the heating resistor plate 103 is provided at the bottom of the water tank body 1.
The feed gate 101 is used to add solids and salt to the tank body 1 and to clean the inside of the tank body 1.
The water flow circulation box is used for separating solids and liquid in water of the two-phase rolling flushing chamber and recycling the liquid, and comprises a circulation box body 2, wherein the circulation box body 2 is of a cubic structure of 50cm multiplied by 50 cm; a filter screen 201 is arranged in the inner cavity of the circulation box body 2.
Wherein the filter screen 201 is used for separating solids and liquids in the circulating water.
As shown in fig. 4, two roller compaction flushing chambers, the method is used for simulating the scouring action of the solid-liquid two-phase factors on the test piece. The device comprises a flushing chamber body 3, a partition plate 4, a piece bearing table 5, a rolling device and a power control system, wherein the partition plate 4 is fixed in the flushing chamber body 3 to divide the flushing chamber body 3 into an upper part and a lower part; the bearing platform 5 is arranged at the middle position of the partition plate 4, the bottom of the bearing platform 5 is communicated with the middle position of the partition plate 4, and meanwhile, a rubber net pad is arranged at the bottom of the bearing platform 5; the rolling device is arranged right above the bearing platform 5 and is powered by a power control system 8.
The rolling device comprises a rolling wheel 6 and a rotating brush 7, wherein the two rotating brushes 7 are arranged on two sides of the rolling wheel 6 respectively, and meanwhile, the rotating brush 7 and the rolling wheel 6 are connected with a power control system 8 through connecting rods. The direction of rotation of the rotating brush 7 is opposite to the direction of rotation of the roller 6.
The rolling wheel 6 simulates the rolling action and pumping action of the wheel, the rotary brush 7 simulates and enhances the scouring action of water flow, and meanwhile, manually added solid particles and solid particles separated from a test piece can be cleaned, so that the particles are prevented from fouling the wheel.
Also connected to the power control system 8 are control buttons 9 and a pressure display 10.
A feeding hopper 301 for adding solid particles into the flushing box is arranged on the flushing chamber body 3, and a valve is arranged on the feeding hopper 301; the solid particles adopt steel balls with the particle size of 5 mm.
The flushing chamber body 3 is also provided with a fetching door.
The flushing chamber body 3 is of a cuboid structure of 40cm multiplied by 50cm multiplied by 70 cm; the carrying platform 5 is a metal groove with the length of 15cm multiplied by 20cm multiplied by 60 cm; the size of the rubber net pad is 25cm multiplied by 55cm; the rolling wheel is a wheel with the height of 20cm and the diameter of 12 cm.
The water-stabilized macadam base flushing control water tank is respectively connected with the water flow circulation tank, the upper parts of the two rolling flushing chambers and the lower parts of the two rolling flushing chambers through the guide pipes; the upper parts of the two rolling flushing chambers are in butt joint connection with the first diversion trench 202 on the water flow circulation box through the second diversion trench 302.
Meanwhile, valves are arranged on the diversion pipes; the upper honeycomb duct of the scouring chamber body is also provided with a high-pressure water pump.
Compared with the prior art, the device for measuring the scouring resistance has the following advantages:
(1) In actual road flushing, the solid and the liquid are always the same and act on the road surface, and not only have the effect of water; in addition, the temperature and the osmotic pressure of the bottom and the top of the plate are also generally different, for example, after deicing salt is scattered in winter, the salt concentration of pavement water flow is high, the temperature is lower, and when the pavement is subjected to water flow scouring, the pavement is also generally subjected to salt erosion; the invention comprehensively considers factors such as load, solid-liquid two-phase action, temperature, osmotic pressure, erosion action and the like, and is more comprehensive and scientific than the prior device;
(2) The traditional anti-scouring ability evaluation index is usually to use the ratio of the difference between the mass before scouring and the mass after scouring to the mass before scouring as the evaluation index of the anti-scouring ability, but the damage of the test piece is nonlinear, the lost mass in a certain time is insufficient to evaluate the anti-scouring ability of the test piece, the evaluation index cannot accurately reflect the anti-scouring ability of the test piece, and the evaluation index of the invention is the inflection point time t of the damage t-beta curve of the test piece 0 More scientific than the loss mass ratio per unit time.
In the test, the sizes of the test pieces are 15cm multiplied by 20cm multiplied by 30cm, and two test pieces can be placed on the piece bearing table at the same time; the flow rate of water is set to be 3-12 m/s, the maximum pressure of the small wheel is 60% of the compressive strength of the test piece, the speed of the brush is the same as that of the small wheel, the speed is 5-20 m/s, the salt concentration is set to be 5%, and the maximum temperature difference is 10 ℃.
Two test pieces are placed on the bearing platform simultaneously, so that the pumping action of a base layer can be well simulated, and the schematic diagram is shown in the following figure 1: the two test pieces are arranged on a piece bearing table paved with rubber net pads in parallel, when the small wheels are close to the joint of the test pieces, the rubber net pads are pressed and deformed, the test pieces tilt, and water flows to the movement direction of the test pieces; when the small wheel drives into the second test piece, the first test piece returns to the original state, the rubber net pad under the second test piece is pressed, so that the second test piece and the first test piece form a staggered table, and water flow deviates from the movement direction of the test piece, so that water flow scouring can be formed at the bottom of the plate. Meanwhile, the test piece repeatedly bears the load action of the small wheel, and a pumping action is formed under the action of water and the load.
The specific operation process of the instrument is as follows:
(1) Adding about 80% of water into the water-stabilized macadam base flushing control water tank, and starting a valve to enable water flow to enter the lower part of the two-phase rolling flushing chamber from the water-stabilized macadam base flushing control water tank and enable the water to be completely filled in the lower tank body;
(2) Adding a certain amount of salt into the residual water in the tank body from the charging door to enable the salt concentration in the water to reach the experimental requirement, starting a heating control button, heating the residual water in the tank by using a heating resistor plate 103, detecting the temperature of the water flow in the tank by using a thermocouple 102, reading the temperature data in the tank from a temperature display, heating to a temperature which is about 10 ℃ higher than that of the water in the original tank, and reducing the power to enable the water in the tank to keep the temperature all the time;
(3) Forming a scouring test piece, wherein the size of the scouring test piece is 20cm multiplied by 30cm multiplied by 40cm, taking out the scouring test piece after curing for 7 days, wiping the scouring test piece with a clean rag to determine the scouring resistance of the test piece, and determining that the mass of the two test pieces at the moment is m 1 The method comprises the steps of carrying out a first treatment on the surface of the Opening a piece taking door, putting a test piece into a piece bearing table from the piece taking door, and fixing the test piece;
(4) Opening a valve, setting the flow and the flow rate of water in the two-phase rolling flushing chamber through a control button, and opening a control valve of the feeding hopper to control the speed of adding aggregate into the two-phase rolling flushing chamber by the feeding hopper; and a power control system button is turned on, the rotation speed of the rotary brush, the pressure of the rolling wheel and the running speed are set, and related data can be read from a display.
Claims (4)
1. A two-phase rolling scour instrument of a programmable water-stable macadam base layer is characterized in that: the device comprises a water-stabilized macadam base flushing control water tank, a water flow circulation tank and two-phase rolling flushing chambers, wherein the water-stabilized macadam base flushing control water tank is connected with the two-phase rolling flushing chambers through the water flow circulation tank;
the water-stabilized macadam base flushing control water tank comprises a water tank body (1), wherein a feed door (101) and a temperature control system for measuring and controlling the water temperature in the water tank are arranged on the water tank body (1), and the feed door (101) is arranged at the top of the water tank body (1);
the two-phase rolling flushing chamber comprises a flushing chamber body (3), a partition plate (4), a bearing table (5), a rolling device and a power control system, wherein the partition plate (4) is fixed in the flushing chamber body (3) to divide the flushing chamber body (3) into an upper part and a lower part; the bearing platform (5) is arranged at the middle position of the partition plate (4), the bottom of the bearing platform (5) is communicated with the middle position of the partition plate (4), and meanwhile, a rubber net pad is arranged at the bottom of the bearing platform (5); the rolling device is arranged right above the bearing platform (5) and is powered by the power control system (8);
the rolling device comprises a rolling wheel (6) and rotary brushes (7), wherein the two rotary brushes (7) are respectively arranged at two sides of the rolling wheel (6), and meanwhile, the rotary brushes (7) and the rolling wheel (6) are connected with a power control system (8) through connecting rods;
the rotating direction of the rotating brush (7) is opposite to the rotating direction of the rolling wheel (6);
a feeding hopper (301) for adding solid particles into the flushing box is arranged on the flushing chamber body (3), and a valve is arranged on the feeding hopper (301);
the water-stabilized macadam base flushing control water tank is respectively connected with the water flow circulation tank, the upper part of the two-phase rolling flushing chamber and the lower part of the two-phase rolling flushing chamber through the guide pipe; the upper part of the two-phase rolling flushing chamber is connected with the water flow circulation box through a diversion trench.
2. The programmable water-stable macadam foundation two-phase rolling scour instrument of claim 1, wherein: the temperature control system comprises a thermocouple (102), a heating resistor plate (103), a display (104) and a heating control button (105), wherein the heating resistor plate (103) is arranged at the bottom of the water tank body (1).
3. The programmable water-stable macadam foundation two-phase rolling scour instrument of claim 1, wherein: the water flow circulation box comprises a circulation box body (2), and a filter screen (201) is arranged in the inner cavity of the circulation box body (2).
4. The programmable water-stable macadam foundation two-phase rolling scour instrument of claim 1, wherein: the power control system (8) is also connected with a control button (9) and a pressure display (10).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711148872.2A CN107655778B (en) | 2017-11-17 | 2017-11-17 | Two-phase rolling and flushing instrument for programmable water-stabilized macadam base |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711148872.2A CN107655778B (en) | 2017-11-17 | 2017-11-17 | Two-phase rolling and flushing instrument for programmable water-stabilized macadam base |
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| CN107655778A CN107655778A (en) | 2018-02-02 |
| CN107655778B true CN107655778B (en) | 2024-02-02 |
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| CN107655778A (en) | 2018-02-02 |
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