CN110763608A - Device and method for testing permeability of Marshall test piece of asphalt mixture - Google Patents
Device and method for testing permeability of Marshall test piece of asphalt mixture Download PDFInfo
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- CN110763608A CN110763608A CN201911136604.8A CN201911136604A CN110763608A CN 110763608 A CN110763608 A CN 110763608A CN 201911136604 A CN201911136604 A CN 201911136604A CN 110763608 A CN110763608 A CN 110763608A
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- 238000012360 testing method Methods 0.000 title claims abstract description 154
- 239000010426 asphalt Substances 0.000 title claims abstract description 49
- 230000035699 permeability Effects 0.000 title claims abstract description 49
- 239000000203 mixture Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 235
- 239000007788 liquid Substances 0.000 claims abstract description 67
- 238000005192 partition Methods 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims description 15
- 239000002352 surface water Substances 0.000 claims description 10
- 230000006641 stabilisation Effects 0.000 claims description 7
- 238000011105 stabilization Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 4
- 241001330002 Bambuseae Species 0.000 claims description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 4
- 239000011425 bamboo Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000003566 sealing material Substances 0.000 claims description 3
- 238000004088 simulation Methods 0.000 description 4
- 239000011384 asphalt concrete Substances 0.000 description 2
- 235000013871 bee wax Nutrition 0.000 description 2
- 239000012166 beeswax Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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Abstract
The invention discloses a device and a method for testing the permeability of a Marshall test piece of an asphalt mixture, wherein the device comprises a water storage cylinder, an air press, a test piece placing cylinder and an adjustable bracket; the top of the water storage cylinder is provided with a water inlet and an air inlet; wherein, the water inlet is communicated with a water source, and the air inlet is communicated with a compressed gas outlet of the air press; the water storage cylinder is arranged at the top of the test piece placing cylinder, the water storage cylinder is in sealed connection with the test piece placing cylinder, a water flow channel is arranged between the water storage cylinder and the test piece placing cylinder, and a first water outlet is formed in the bottom of the water storage cylinder; a first liquid level meter is arranged on the side surface of the water storage cylinder, and a second liquid level meter is arranged on the side surface of the test piece placing cylinder; a partition plate is arranged in the middle of the test piece placing cylinder, a water flow channel is arranged at the partition plate, and a second water outlet is formed in the bottom of the test piece placing cylinder; the method can be used for simulating the permeability of the road surface under the action of dynamic water pressure, can control the size of hydraulic gradient, and can more accurately detect the permeability of various road surfaces with different gradients.
Description
Technical Field
The invention belongs to the field of detection and evaluation of pavement performance of an asphalt mixture, and particularly relates to a device and a method for testing permeability of a marshall test piece of the asphalt mixture.
Background
Every year, highways and urban roads in China can encounter rainwater of different degrees, and the rainwater forms dynamic water pressure under the action of the pressure of automobile tires in a high-speed mode, so that the asphalt concrete pavement is subjected to large scouring and denudation effects. Moreover, the 'water drift' formed by the dynamic water pressure on the road surface during driving in rainy days is a main reason for the failure of the steering wheel, the brake failure and the like in rainy days. Therefore, in the design of pavement structure, the measurement and control of the permeability of the asphalt concrete of the pavement are very important. At present, the domestic test technology of the water permeability of the asphalt mixture is mainly a pavement water seepage instrument, the test of the indoor asphalt mixture permeability is time-consuming and has larger error, the field asphalt mixture pavement can only measure the water seepage speed, the permeability under the action of dynamic water pressure cannot be simulated, the detection is difficult to implement on a sloping road section, and the size of the hydraulic gradient cannot be controlled, so that the measurement of the pavement permeability is limited. In view of the above problems, there is a need for an improved road permeability measurement.
Disclosure of Invention
In order to solve the problems, the invention provides a device and a method for testing the permeability of an asphalt mixture Marshall test piece, which are used for simulating the permeability of asphalt mixture pavements in different flowing water states and testing the permeability of asphalt mixture pavements in different gradients.
In order to achieve the purpose, the invention adopts the technical scheme that the device for testing the permeability of the Marshall test piece of the asphalt mixture comprises a water storage cylinder, an air press, a test piece placing cylinder and an adjustable bracket; the top of the water storage cylinder is provided with a water inlet and an air inlet; wherein, the water inlet is communicated with a water source, and the air inlet is communicated with a compressed gas outlet of the air press; the water storage cylinder is arranged at the top of the test piece placing cylinder, the water storage cylinder is in sealed connection with the test piece placing cylinder, a water flow channel is arranged between the water storage cylinder and the test piece placing cylinder, and a first drainage port is formed in the bottom of the water storage cylinder; a first liquid level meter is arranged on the side surface of the water storage cylinder and is communicated with the bottom of the water storage cylinder, a second liquid level meter is arranged on the side surface of the test piece placing cylinder and is communicated with the bottom of the test piece placing cylinder; a partition plate is arranged in the middle of the test piece placing cylinder, a water flow channel is arranged at the partition plate, and a second water outlet is formed in the bottom of the test piece placing cylinder; the adjustable support is arranged below the test piece placing barrel, one side of the adjustable support is highly fixed, and the other side of the adjustable support is provided with a foot spiral.
A first water outlet and a first water drainage outlet are formed in the bottom of the water storage cylinder, a first valve is arranged at the first water outlet, a second water outlet is formed in the partition plate, and the first water outlet is a water flow channel between the water storage cylinder and the test piece placing cylinder; the second water outlet is provided with a second valve and is a water flow channel at the position of the partition plate.
The bottom of the water storage cylinder is provided with a sealing ring.
The air press is provided with a control switch and an air pressure gauge, and an air outlet of the air press is communicated with an air inlet through a pipeline; the water inlet is communicated with a water source through a pipeline, and a valve is arranged on the pipeline.
The test piece placing cylinder is hinged with one side of the water storage cylinder through a hinged shaft, and the other side of the test piece placing cylinder is fastened through a hasp in the test process.
The adjustable support comprises a supporting plate and three supporting legs, wherein one fixed supporting leg is hinged with the supporting plate, the other two supporting legs adopt foot spirals, and a base is arranged below the supporting legs.
The method for testing the permeability of the Marshall test piece of the asphalt mixture comprises the following steps:
step 1, sealing the side surface of a Marshall test piece of the asphalt mixture, and installing the Marshall test piece in a test piece placing cylinder;
Step 3, calculating the water permeability coefficient of the Marshall test piece of the asphalt mixture,
V1＝π·R2·(L+L2-L1) (1)
V2＝π·R2·L3(2)
V3＝V1-V2＝π·R2·(L+L2-L1-L3) (3)
in the formula: v1-accumulating the amount of water added,
V2-the second level gauge measures the amount of water;
V3-marshall test piece water content;
L1-a first level gauge reading after the liquid level has stabilized;
L2-a first level meter reading after the second fill/drain;
L3-a final second level meter reading;
t1-time after the liquid level of the first level gauge has stabilized;
t2-time after the liquid level of the second level gauge has stabilized;
Cw1-initial road surface water permeability coefficient;
Cw2-average road surface water permeability coefficient;
Cw3-road surface water permeability coefficient under hydrodynamic pressure;
Li-water level at the ith time;
Lj-water level at jth time of timing;
ti-the time of the ith timing;
tj-the time of the jth timing;
the formula (4) is used for calculating the initial pavement water seepage coefficient; the formula (5) is used for calculating the pavement water permeability coefficient of adjacent intervals and finally determining the variation trend of the permeability coefficient; l in the formula (6)iAnd LjThe reading of the second level gauge is used.
In the step 1, a layer of molten sealing material is roll-coated on the side surface of the asphalt mixture Marshall test piece, the side surface of the asphalt mixture Marshall test piece is sealed by a rubber ring, and the rubber ring with the height of the test piece is cut off.
In step 3, reading the reading of the first liquid level meter when measurement is started, wherein the reading of the second liquid level meter is not obvious in change and difficult to read out accurate reading, reading and recording the reading of the first liquid level meter for calculation, and reading and recording the reading of the second liquid level meter for calculation when the water level drops below the minimum scale line of the liquid level meter in the later period of the test; reading the two scales of the first liquid level meter and the second liquid level meter at the same time in the middle period of the test, and comparing (L)Ai-LAj) And (L)Bi-LBj) If the two are not differentIf the average value exceeds 5%, calculating the average value, otherwise, re-testing; wherein L isAiI-th reading of the first level gauge, LBiI-th reading of the second level gauge, LAjIs the j-th reading of the first level gauge, LBjThe j-th reading of the second gauge.
Compared with the prior art, the invention has at least the following beneficial effects: the water storage cylinder is arranged at the top of the test piece placing cylinder, the water storage cylinder is in sealed connection with the test piece placing cylinder, a water flow channel is arranged between the water storage cylinder and the test piece placing cylinder, a first water outlet is formed in the bottom of the water storage cylinder, and a water inlet and an air inlet are formed in the top of the water storage cylinder; wherein, the water inlet is communicated with a water source, and the air inlet is communicated with a compressed gas outlet of the air press; the air press machine outputs gas higher than normal pressure to apply pressure to the test piece placing cylinder, so that the permeability of a road surface under the action of dynamic water pressure can be simulated, and the size of hydraulic gradient can be controlled by combining the water inflow of the water inlet, controlling a water flow channel between the water storage cylinder and the test piece placing cylinder and the first water discharge port; the adjustable support in below that a section of thick bamboo was placed to the test piece that can be more accurate to the adjustment changes the inclination of adjustable support, and then makes the test piece place the test piece in the section of thick bamboo and have the angle with the horizontal direction, realizes the multiple permeability that has different slope road surfaces of simulation test.
Furthermore, a first water outlet and a first valve are arranged, a second valve is arranged at the position of the second water outlet, the water quantity of the water storage cylinder entering the test piece placing cylinder can be flexibly controlled, and simulation conditions under different accurate precipitation quantities can be provided.
Furthermore, a sealing ring is arranged at the bottom of the water storage cylinder, on one hand, the sealing ring can be used for sealing the water storage cylinder and the test piece placing cylinder, and on the other hand, the upper half part of the device can be conveniently placed on an actual road surface for a local simulation test; the test bed can be used for testing indoor Marshall test pieces and can also be used for testing permeability on site.
Furthermore, an air press is used for pressurizing the water storage cylinder and the test piece placing cylinder, so that the flowing water environment under different pressures can be simulated.
Furthermore, the test piece placing barrel is hinged with one side of the water storage barrel through a hinge shaft, so that the test piece can be conveniently placed.
Furthermore, the adjustable support comprises a supporting plate and three supporting legs, wherein one fixed supporting leg is hinged with the supporting plate, the other two supporting legs adopt foot screws, and the slope change of the adjustable support can be realized by changing the height of one supporting leg through adjusting the foot screw type supporting legs.
By adopting the method, firstly, the angle of the Marshall test piece is adjusted to correspondingly simulate different slopes; and injecting set water quantity into the water storage cylinder to simulate different total precipitation quantities, conveying water into the test piece placing cylinder, changing the surface pressure of the test piece by using an air press machine, simulating the water seepage performance under the variable pressure condition, further controlling the water quantity in the test piece placing cylinder, reading the data of the water quantity change process from the liquid level meter, and calculating the water seepage coefficient of the test piece according to the data obtained in the simulation test, wherein the water seepage coefficient can be used for reflecting the water seepage performance of the road surface.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a top view of the water storage cartridge of the present invention;
FIG. 3 is a top view of the specimen holding cylinder, the base plate, the adjustable support and the base of the present invention.
Fig. 4 is a schematic view of the valve.
The device comprises a water storage barrel 1, an air press 2, a test piece placing barrel 3, a bottom plate 4, an adjustable support 5, a base 6, a water inlet 7, an air inlet 8, a first water outlet 9, a first water outlet 10, a first liquid level meter 11, a rubber gasket 12, a control switch 13, a barometer 14, a first valve 15, a hinged shaft 16, a hasp 17, a second water outlet 18, a second valve 19, a second water outlet 20, a rubber plug 21, a second liquid level meter 22 and a screw 23.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 to 3, a device for testing the permeability of a marshall test piece of an asphalt mixture comprises a water storage cylinder 1, an air press 2, a test piece placing cylinder 3, a bottom plate 4, an adjustable bracket 5 and a base 6; the top of the water storage cylinder 1 is provided with a water inlet 7 and an air inlet 8; wherein the water inlet 7 is communicated with a water source, and the air inlet 8 is communicated with a compressed gas outlet of the air press 2; a first water outlet 9 and a first water outlet 10 are formed in the bottom of the water storage cylinder 1, a first liquid level meter 11 is further arranged on the side face of the water storage cylinder 1, and a rubber gasket is arranged at the bottom of the water storage cylinder 1 and serves as a sealing ring 12.
The air press machine 2 is provided with a control switch 13 and an air pressure gauge 14, the air press machine 2 is provided with a rubber pipeline connected with the air inlet 8, the water inlet 7 is communicated with a water source through a rubber water pipe, and the water inflow and the water inlet speed of the water inlet 7 can be controlled through a valve; a first valve 15 is installed at the first water outlet 9, the liquid level meter 11 is arranged outside one side of the water storage cylinder 1, and the bottom end of the first liquid level meter 11 is communicated with the bottom of the water storage cylinder 1.
The test piece placing cylinder 3 is arranged below the water storage cylinder 1, the test piece placing cylinder 3 is hinged to one side of the water storage cylinder 1 through a hinge shaft 16, the other side of the test piece placing cylinder is fixed through a hasp 17 during testing to play a sealing role, the bottom plate 4 and the test piece placing cylinder 3 are integrated, a second water outlet 18 is arranged below the test piece placing cylinder 3, a second valve 19 is arranged at the second water outlet 18, and water inlet and outlet of the second valve 19 are controlled through the second valve 19; a second water outlet 20 is reserved below the bottom plate 4, the second water outlet 20 is blocked by a rubber plug 21, and a second liquid level meter 22 is mounted on the other side of the second water outlet.
Optionally, the first valve 15 and the second valve 19 are all valves in road engineering asphalt and asphalt mixture test specification T0730-2011.
Optionally, a first water outlet is formed in a bottom plate of the water storage barrel 1, a blind hole is formed in the horizontal direction of the bottom plate of the water storage barrel 1, the blind hole is communicated with the water outlet, a sealing column is arranged in the blind hole, a hole capable of being communicated with the water outlet is formed in one end, extending into the blind hole, of the sealing column, a first valve 15 is formed, the sealing column is rotated to change the flow area of the first water outlet and control the opening and closing of the first water outlet; the second valve 19 is implemented by the same structure as the first valve 15.
The water storage cylinder 1 and the test piece placing cylinder 3 have the same cross section shape and size.
The adjustable support 5 comprises a support plate and three support legs, wherein one fixed support leg is hinged with the support plate, the other two support legs adopt foot spirals 23, the inclination angle of the support plate can be changed by adjusting the height of the foot spirals 23, and different road surface gradients are simulated; a base 6 is arranged below the supporting leg.
Optionally, four support legs may be further disposed below the support plate, two of the four support legs are fixed support legs, the fixed support legs are coaxially hinged to the support plate, and the other two support legs adopt foot spirals 23.
In the embodiment, the permeability of a Marshall test piece of a certain asphalt mixture is tested by adopting the method of the invention as follows:
step 1: wrapping a rubber ring around the side face of a well compacted asphalt mixture Marshall test piece, then placing the Marshall test piece into a test piece placing cylinder 3, coating molten beeswax at the contact gap position of the test piece and the test piece placing cylinder 3 to ensure that water does not seep out from the contact position of the asphalt mixture Marshall test piece and the test piece placing cylinder, covering a water storage cylinder 1 after the beeswax is cooled and solidified, and locking a hasp; the invention adopts Vaseline to cut off a rubber ring with more test piece height,
and step 3: the water permeability coefficient of the asphalt mixture Marshall test piece is calculated according to the following formula.
V1＝π·522·(30+L2-L1) (1)
V2＝π·522·L3(2)
V3＝V1-V2＝π·522·(30+L2-L1-L3) (3)
In the formula: v1-cumulative amount of water added (mL);
V2-scale B measures the amount of water (mL);
V3marshall test piece water content (mL);
L1-level gauge reading (mL) after level stabilization;
L2-a second post fill/drain level gauge reading (mL);
L3-final scale B reading (mL);
t1-time(s) after the level of the gauge has stabilized;
t2-time(s) after the liquid level of scale B has stabilized;
Cw1-initial road surface water permeability coefficient (mL/min);
Cw2-average road surface water penetrationCoefficient (mL/min);
Cw3-road surface water permeability coefficient (mL/min) under hydrodynamic pressure;
Li-water level (mm) at the ith time of metering;
Lj-water level (mm) at jth time of metering;
ti-the time(s) of the ith timing;
tj-the j-th timed time(s).
The formula (4) can be used for calculating the initial pavement water seepage coefficient; the formula (5) can be used for calculating the adjacent road surface water seepage coefficients at intervals, and finally determining the change trend of the permeability coefficient so as to research the change conditions of the permeability coefficient along with the dynamic water pressure, the road surface gradient and the rainfall. For L in equation (6)iAnd LjThe reading of the first gauge 11 or the second gauge 22 is taken. Examples are: when the measurement is started, the reading change of the lower second liquid level meter 22 is not obvious, accurate reading is difficult to read, the reading of the first liquid level meter 11 can be recorded for calculation, the water level drops below the minimum scale mark of the first liquid level meter 11 in the later period of the test, and the reading of the lower second liquid level meter is read and recorded for calculation. The readings of the upper and lower scales can be read at the same time in the middle period of the test and compared (L)Ai-LAj) And (L)Bi-LBj) If the difference between the two is not more than 5%, taking the average value to calculate, otherwise, retesting, wherein LAiThe i-th reading, L, of the first level gauge 11BiI-th reading, L, of the second gauge 22AjIs the j-th reading, L, of the first level gauge 11BjThe j-th reading of the second gauge 22.
After the test is finished, the air press 2 is closed, and the adjustable bracket 5 is adjusted to enable the testing device to recover the horizontal position; opening the second water outlet 20, discharging the water in the testing device, and closing the second water outlet 20; and opening the hasp, opening the water storage cylinder 1, taking out the tested Marshall test piece of the asphalt mixture, and carrying out the permeability test of the next Marshall test piece.
The device can be used for indoor tests and outdoor field tests, the hinged shaft of the water storage cylinder 1 is taken down, the center of the water storage cylinder 1 is aligned to the center of a measuring point, the bottom of the water storage cylinder 1 is provided with a rubber sealing ring, the outer ring is sealed by a sealing material, the first drainage port 10 is closed, the first water outlet 9 is closed, the water inflow is controlled according to the environment of the asphalt pavement, and the water inlet is closed after water is added; opening the air press 2, and adjusting air pressure to simulate the running water pressure at different speeds; and opening the first water outlet 10, starting to record liquid level counting every 1 minute, stopping reading when the reading of the liquid level meter is less than the minimum scale by 1mm or the observation time exceeds 5min, and shortening reading and recording the reading of the scale meter every 30s if the reading of the scale meter changes too fast under the action of the hydrodynamic pressure.
Claims (9)
1. The device for testing the permeability of the asphalt mixture Marshall test piece is characterized by comprising a water storage cylinder (1), an air press (2), a test piece placing cylinder (3) and an adjustable bracket (5); the top of the water storage cylinder (1) is provided with a water inlet (7) and an air inlet (8); wherein the water inlet (7) is communicated with a water source, and the air inlet (8) is communicated with a compressed gas outlet of the air press (2); the water storage cylinder (1) is arranged at the top of the test piece placing cylinder (3), the water storage cylinder (1) is in sealing connection with the test piece placing cylinder (3), a water flow channel is arranged between the water storage cylinder (1) and the test piece placing cylinder (3), and a first water discharge port (10) is formed in the bottom of the water storage cylinder (1); a first liquid level meter (11) is arranged on the side surface of the water storage barrel (1), the first liquid level meter (11) is communicated with the bottom of the water storage barrel (1), a second liquid level meter (22) is arranged on the side surface of the test piece placing barrel (3), and the second liquid level meter (22) is communicated with the bottom of the test piece placing barrel (3); a partition plate is arranged in the middle of the test piece placing cylinder (3), a water flow channel is arranged at the partition plate, and a second water outlet (20) is formed in the bottom of the test piece placing cylinder (3); the adjustable support (5) is arranged below the test piece placing barrel (3), one side of the adjustable support (5) is highly fixed, and the other side of the adjustable support is provided with a foot spiral (23).
2. The device for testing the permeability of the asphalt mixture Marshall test piece according to claim 1, wherein a first water outlet (9) and a first water discharge outlet (10) are formed in the bottom of the water storage cylinder (1), a first valve (15) is arranged at the first water outlet (9), a second water outlet is arranged at the partition plate, and the first water outlet (9) is a water flow channel between the water storage cylinder (1) and the test piece placing cylinder (3); the second water outlet (18) is provided with a second valve (19), and the second water outlet (18) is a water flow channel at the position of the partition board.
3. The testing device for the permeability of the asphalt mixture Marshall test piece according to claim 1, characterized in that the bottom of the water storage cylinder (1) is provided with a sealing ring (12).
4. The device for testing the permeability of the asphalt mixture Marshall test piece according to claim 1, wherein a control switch (13) and a barometer (14) are arranged on the air press (2), and an air outlet of the air press (2) is communicated with the air inlet (8) through a pipeline; the water inlet (7) is communicated with a water source through a pipeline, and a valve is arranged on the pipeline.
5. The device for testing the permeability of the asphalt mixture Marshall test piece according to the claim 1, characterized in that the test piece placing cylinder (3) is hinged with one side of the water storage cylinder (1) through a hinged shaft (16), and the other side is fastened through a hasp (17) during the test.
6. The device for testing the permeability of the asphalt mixture marshall test piece according to claim 1, wherein the adjustable support (5) comprises a support plate and three support legs, one fixed support leg is hinged with the support plate, the other two support legs adopt foot spirals (23), and a base (6) is arranged below each support leg.
7. A method for testing the permeability of a Marshall test piece of an asphalt mixture is characterized by comprising the following steps:
step 1, sealing the side surface of a Marshall test piece of the asphalt mixture, and installing the Marshall test piece in a test piece placing cylinder (3);
step 2, adjusting the adjustable support to simulate the gradient of the asphalt pavement, so that the angle of the Marshall test piece of the asphalt mixture is consistent with the gradient of the pavement; adjusting the adjustable support to make the gradient of the adjustable support and the asphalt roadThe surface gradient is unanimous, close first drain outlet (10), second drain outlet (20), first delivery port (9) and second delivery port (18), open the valve of water inlet (7), add water to first level gauge (11) and show that the volume of water in a water storage section of thick bamboo (1) is greater than the test piece and places the twice of the space volume above the intermediate bottom of a section of thick bamboo (3) well partition board except test piece volume, the scale of first level gauge is L, close the water inlet valve, open the valve of first delivery port (9), begin the timing simultaneously, wait to read first level gauge reading L after the liquid level is stable1Recording the liquid level stabilization time t1(ii) a According to the rainfall condition of the geographical position of the asphalt pavement, a valve of the water inlet (7) is opened or the first water discharge port (10) is opened, the water inflow is adjusted until the first liquid level meter (11) displays L2After the adjustment is finished, correspondingly closing the water inlet valve or the first water discharging port (10); opening the air press (2), and adjusting air pressure to simulate the running water pressure at different speeds; opening a second valve (19), starting timing at the same time, and recording the reading of the scale at intervals of delta t; stopping reading when the liquid level displayed by the second liquid level meter (22) is stable or the observation time exceeds 5min, and reading L of the second liquid level meter (22)3Recording the liquid level stabilization time t2；
Step 3, calculating the water permeability coefficient of the Marshall test piece of the asphalt mixture,
V1＝π·R2·(L+L2-L1) (1)
V2＝π·R2·L3(2)
V3＝V1-V2＝π·R2·(L+L2-L1-L3) (3)
in the formula: v1-accumulating the amount of water added,
V2-the second level gauge measures the amount of water;
V3-marshall test piece water content;
L1-a first level gauge reading after the liquid level has stabilized;
L2-a first level meter reading after the second fill/drain;
L3-a final second level meter reading;
t1-time after the liquid level of the first level gauge has stabilized;
t2-time after the liquid level of the second level gauge has stabilized;
Cw1-initial road surface water permeability coefficient;
Cw2-average road surface water permeability coefficient;
Cw3-road surface water permeability coefficient under hydrodynamic pressure;
Li-water level at the ith time;
Lj-water level at jth time of timing;
ti-the time of the ith timing;
tj-the time of the jth timing;
the formula (4) is used for calculating the initial pavement water seepage coefficient; the formula (5) is used for calculating the pavement water permeability coefficient of adjacent intervals and finally determining the variation trend of the permeability coefficient; l in the formula (6)iAnd LjThe reading of the second gauge (22) is taken.
8. The method for testing the permeability of the asphalt mixture marshall test piece according to claim 7, wherein in the step 1, a layer of molten sealing material is roll-coated on the side surface of the asphalt mixture marshall test piece, a rubber ring is used for sealing the side surface of the asphalt mixture marshall test piece, and the rubber ring with the height larger than that of the test piece is cut off.
9. According to the claimsThe method for testing the permeability of the asphalt mixture Marshall test piece is characterized in that in the step 3, when the measurement is started, the reading of the first liquid level meter (11) is read, the reading of the second liquid level meter is not obvious in change, and the accurate reading is difficult to read, at the moment, the reading of the first liquid level meter (11) is read and recorded for calculation, the water level is reduced below the minimum scale mark of the liquid level meter in the later stage of the test, and at the moment, the reading of the second liquid level meter (22) is read and recorded for calculation; reading the two scales of the first liquid level meter (11) and the second liquid level meter (22) at the same time in the middle period of the test, and comparing (L)Ai-LAj) And (L)Bi-LBj) If the difference between the two is not more than 5%, the average value is calculated, otherwise, the test is carried out again; wherein L isAiThe i-th reading, L, of the first level gauge (11)BiThe i-th reading, L, of the second level gauge (22)AjIs the jth reading, L, of the first level gauge (11)BjThe jth reading of the second gauge (22).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730199A (en) * | 2021-02-01 | 2021-04-30 | 温州市市政工程建设开发公司 | Water permeability detection device and method for permeable asphalt concrete |
| CN115372229A (en) * | 2022-09-20 | 2022-11-22 | 山东路德新材料股份有限公司 | Water flow testing device that perpendicular infiltration side flows out |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730199A (en) * | 2021-02-01 | 2021-04-30 | 温州市市政工程建设开发公司 | Water permeability detection device and method for permeable asphalt concrete |
| CN115372229A (en) * | 2022-09-20 | 2022-11-22 | 山东路德新材料股份有限公司 | Water flow testing device that perpendicular infiltration side flows out |
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