CN107807044A - The experimental rig and method of modulus change after in assessing before asphalt soaks - Google Patents
The experimental rig and method of modulus change after in assessing before asphalt soaks Download PDFInfo
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- CN107807044A CN107807044A CN201710875892.3A CN201710875892A CN107807044A CN 107807044 A CN107807044 A CN 107807044A CN 201710875892 A CN201710875892 A CN 201710875892A CN 107807044 A CN107807044 A CN 107807044A
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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Abstract
The invention discloses the experimental rig and method of rear modulus change in a kind of assess before asphalt soaks,Power set are located at the top of environmental cabinet,The output end of power set is connected with the upper end of pressure axis,The lower end of pressure axis is provided with the connector for connecting pressure probe and closed cover,Closed cover is covered in the open top of test tank,Base is located at the bottom of environmental cabinet,The upper end of backup rolls is connected with the bottom of test tank,The lower end of backup rolls is fixed on base,The bottom of test tank is provided with rubber base plate,Lateral spacing cylinder is located on rubber base plate,The side of test tank is provided with bleeding point,Vavuum pump is connected with the bleeding point,The water inlet being connected with external source is provided with the top of test tank,The bottom of test tank is provided with delivery port,The device and method can measure asphalt tunneling boring load in different temperatures,Modulus change after in before being soaked under thering is lateral spacing to constrain and constrained without lateral spacing.
Description
Technical field
The invention belongs to asphalt performance detection field, modulus change after being related in a kind of assess before asphalt soaks
Experimental rig and method.
Background technology
In recent years, highway in China career development is rapid, particularly High Grade Bitumen Pavement, annual newly-built high-grade road
Face more than 90% is bituminous paving.While Highway Cause high speed development, also occurs a series of problems, pitch in succession
Road surface Moisture Damage is that one of which compares distinct issues.At present, both at home and abroad for bituminous paving anti-water damage ability it is more
Kind evaluation test and method come with some shortcomings, such as do not account for bituminous paving in Local Loads and tunneling boring load
There is lateral spacing to constrain and difference without the anti-water damage property under lateral spacing constraints.The present invention proposes a kind of for testing drip
The experimental rig of modulus change after in before blue or green compound immersion, available for evaluation different pitches road surface resisting at different conditions
Water Damages energy.
Generally, natural precipitation is excluded by the horizontal slope of bituminous paving, but precipitation is excessive, relies solely on horizontal slope
Draining can not be completed, ponding road surface and unrestrained water route face will be formed, is stopped when precipitation when bituminous paving is in water-saturated state again
Bituminous paving after soaking can be formed.Strength Changes index is to evaluating bituminous paving anti-water damage energy after in before bituminous paving immersion
Power, prevention Water Damage on Asphalt Pavement, the rational maintenance of surface of progress are significant.China is to stability of asphalt mixture
The indirect tensile test on frozen-thaw of inspection has carried out substantial amounts of research.However, existing experiment, research are all using destruction tensile strength
To represent the anti-water damage ability of asphalt, thus asphalt modulus change at different conditions can not be tested,
Bituminous paving Strength Changes can not be analyzed with reference to actual conditions so as to carry out Water Damage on Asphalt Pavement preventive maintenance.
The present invention proposes a kind of experimental rig of modulus change after be used in evaluating before asphalt soaks, and can be used for evaluation not
With the anti-water damage property of bituminous paving at different conditions.By testing same bitumen compound test specimen at different conditions
Modulus change after in before (Local Loads, having lateral spacing to constrain or constrained without lateral spacing) immersion, evaluates it and simulates the water resistant of bituminous paving
Damage performance.
The experiment Shortcomings of test bituminous paving anti-water damage ability at present, more lack evaluation bituminous paving in difference
Under the conditions of soak before in after modulus change experimental rig and determine method.The major defect of prior art is as follows：
(1) prior art typically tests stability of asphalt mixture using indirect tensile test on frozen-thaw, existing experiment,
Research is all to represent the anti-water damage ability of asphalt using tensile strength is destroyed, and have ignored compression strength and reaches pole
Moisture Damage caused by limit, and in a practical situation, bituminous paving frequently suffers from pressure rather than pulling force, therefore anti-only with destroying
Tensile strength represents the anti-water damage ability existing defects of asphalt.And indirect tensile test on frozen-thaw condition is more harsh, experiment
It is relatively complicated often up to tens of times even as many as hundred times.
(2) breakdown strength is used for evaluation index before and after prior art normally only uses bitumen mixture specimen freeze thawing, neglects
Modulus change during after during bitumen mixture specimen has been omited before immersion, and test specimen constraints is have ignored to experiment
As a result influence.Therefore, it is impossible to finely determine asphalt in the modulus change in each stage of soaking, it is impossible to which accurate evaluation drips
Blue or green road surface anti-water damage ability.
(3) prior art is typically tested using fixed temperature, and lack influences asphalt water resistant to temperature factor
The thinking of infringement ability, thus wide usage is not strong, it is impossible to bituminous paving anti-water damage ability under accurate evaluation different temperatures.
The content of the invention
The shortcomings that it is an object of the invention to overcome above-mentioned prior art, there is provided one kind assesses asphalt immersion
Before in after modulus change experimental rig and method, it is complete in different temperatures that the device and method can measure asphalt
Section load, there is lateral spacing to constrain and constrained without lateral spacing before lower soak in after modulus change.
To reach above-mentioned purpose, it is of the present invention assess before asphalt immersion in after modulus change experiment dress
Put including computer, vavuum pump, environmental cabinet, the temperature control device for controlling environmental cabinet and the power being arranged in environmental cabinet
Device, pressure axis, lateral spacing cylinder, closed cover, test tank, base, backup rolls and the pressure spy that tunneling boring load can be provided
Head；
Power set are located at the top of environmental cabinet, and the output end of power set is connected with the upper end of pressure axis, pressure axis
Lower end be provided with connector for connecting pressure probe and closed cover, closed cover is covered at the top of test tank and opened
On mouth, base is located at the bottom of environmental cabinet, and the upper end of backup rolls is connected with the bottom of test tank, and the lower end of backup rolls is fixed
In on base, the bottom of test tank is provided with rubber base plate, and lateral spacing cylinder is located on rubber base plate, and the side of test tank is provided with
Bleeding point, vavuum pump are connected with the bleeding point, and the water inlet being connected with external source is provided with the top of test tank,
The bottom of test tank is provided with delivery port, and computer is connected with the output end of pressure probe and the control terminal of power set.
The connector is hickey.
The water outlet of test tank is provided with draining valve；
The water inlet of test tank is provided with water intaking valve；
Extraction valve is provided with the bleeding point of test tank.
Annular groove is provided with rubber base plate, the lower end of lateral spacing cylinder is embedded in the annular groove.
The bottom of closed cover is provided with the rubber groove being engaged with the open-topped wall of test tank.
Vavuum pump is connected by rubber water pipe with the bleeding point on test tank.
The test method of modulus change comprises the following steps after in before assessment asphalt immersion of the present invention：
1a) test specimen to be measured is positioned on rubber base plate, then adjusts the temperature in environmental cabinet；
2a) pressure probe is installed on connector, turns off draining valve, water intaking valve and extraction valve, it is to be measured to simulate
The state that test specimen is in before immersion, the decrement of computer installation test specimen to be measured is 10mm, and power set driving pressure axle is treated
Test block is compressed, and the pressure value that pressure probe measurement obtains when the decrement of test specimen to be measured is 10mm is P1；Reduction pressure
The position of power axle, pressure probe is removed, then closed cover is installed on connector, then adjust the position of pressure axis, make envelope
Close cover plate and be close to test tank closed, then open extraction valve, vavuum pump carries out vacuumize process to test tank, makes in test tank
In vacuum state, then water intaking valve is opened, the water in external source is entered in test tank, and make the water level in test tank
Higher than the top 3cm of test specimen to be measured, water intaking valve is then shut off, then stands 10min, test specimen to be measured is in water-saturated state, with mould
Intend the state that test specimen to be measured is in immersion, then reduce the position of pressure axis, remove closed cover, pressure probe is installed
In on connector, then it is 10mm to set the decrement of test specimen to be measured, and power set driving pressure axle treats test block and applies lotus
Carry, the pressure value that pressure probe measurement obtains when the decrement of test specimen to be measured is 10mm is P2；Then the position of pressure axis is reduced
Put, disconnect vavuum pump, open draining valve and extraction valve, drain the water in test tank, stand 10min, it is to be tested to simulate
The state that part is in after immersion, then compresses test specimen to be measured, the pressure when the decrement of test specimen to be measured is 10mm by pressure axis
The pressure value that probe measurement obtains is P3；
3a) without under lateral spacing constraints, modulus rate of descent α in test specimen immersion to be measured1And modulus after test specimen immersion to be measured
Rate of descent α2For：
The test method of modulus change comprises the following steps after in before assessment asphalt immersion of the present invention：
1b) lateral spacing cylinder is positioned on rubber base plate, then test specimen to be measured is positioned in lateral spacing cylinder, then adjusts environment
Temperature in case；
2b) pressure probe is installed on connector, turns off draining valve, water intaking valve and extraction valve, it is to be measured to simulate
The state that test specimen is in before immersion, the decrement of computer installation test specimen to be measured is 10mm, and power set driving pressure axle is treated
Test block is compressed, and the pressure value that pressure probe measurement obtains when the decrement of test specimen to be measured is 10mm is P11；Reduction pressure
The position of power axle, pressure probe is removed, then closed cover is installed on connector, then adjust the position of pressure axis, make envelope
Close cover plate and be close to test tank closed, then open extraction valve, vavuum pump carries out vacuumize process to test tank, makes in test tank
In vacuum state, then water intaking valve is opened, the water in external source is entered in test tank, and make the water level in test tank
Higher than the top 3cm of test specimen to be measured, water intaking valve is then shut off, then stands 10min, test specimen to be measured is in water-saturated state, with mould
Intend the state that test specimen to be measured is in immersion, then reduce the position of pressure axis, remove closed cover, pressure probe is installed
In on connector, then it is 10mm to set the decrement of test specimen to be measured, and power set driving pressure axle treats test block and applies lotus
Carry, the pressure value that pressure probe measurement obtains when the decrement of test specimen to be measured is 10mm is P21；Then the position of pressure axis is reduced
Put, disconnect vavuum pump, open draining valve and extraction valve, drain the water in test tank, stand 10min, it is to be tested to simulate
The state that part is in after immersion, then compresses test specimen to be measured, the pressure when the decrement of test specimen to be measured is 10mm by pressure axis
The pressure value that probe measurement obtains is P31；
3b) obtain under lateral spacing constraints, modulus rate of descent α in test specimen immersion to be measured11And after test specimen immersion to be measured under modulus
Drop rate α21For：
The test method of modulus change comprises the following steps after in before assessment asphalt immersion of the present invention：
1c) test specimen to be measured is positioned on rubber base plate, the temperature in environmental cabinet is then adjusted, makes the temperature in environmental cabinet
Spend for T1；
2c) pressure probe is installed on connector, turns off draining valve, water intaking valve and extraction valve, it is to be measured to simulate
The state that test specimen is in before immersion, the decrement of computer installation test specimen to be measured is 10mm, and power set driving pressure axle is treated
Test block is compressed, and the pressure value that pressure probe measurement obtains when the decrement of test specimen to be measured is 10mm is P12, reduction pressure
The position of power axle, pressure probe is removed, then closed cover is installed on connector, then adjust the position of pressure axis, make envelope
Close lid and be close to test tank closed, then open extraction valve, vavuum pump carries out vacuumize process to test tank, makes place in test tank
In vacuum state, then water intaking valve is opened, the water in external source is entered in test tank, and make the water level in test tank high
In the top 3cm of test specimen to be measured, water intaking valve is then shut off, then stands 10min, test specimen to be measured is in water-saturated state, with simulation
The state that test specimen to be measured is in immersion, the position of pressure axis is then reduced, remove closed cover, pressure probe is installed on
On connector, then it is 10mm to set the decrement of test specimen to be measured, and power set driving pressure axle is treated test block and is further applied load,
The pressure value that pressure probe measurement obtains when the decrement of test specimen to be measured is 10mm is P22；Then the position of pressure axis is reduced,
Vavuum pump is disconnected, draining valve and extraction valve is opened, drains the water in test tank, 10min is stood, to simulate at test specimen to be measured
State after immersion, test specimen to be measured is then compressed by pressure axis, the pressure probe when the decrement of test specimen to be measured is 10mm
It is P to measure obtained pressure value32；
It is T 3c) to obtain temperature1When, under without lateral spacing constraints, modulus rate of descent α in test specimen immersion to be measured12It is and to be measured
Modulus rate of descent α after test specimen immersion22For：
4c) from test specimen to be measured is newly chosen, the temperature in environmental cabinet is then adjusted to T2, repeat step 2c) and 3c), obtain
Temperature is T2When, under without lateral spacing constraints, modulus rate of descent α in test specimen immersion to be measured1′And modulus after test specimen immersion to be measured
Rate of descent α2′, then the Temperature affection factor λ of test specimen to be measured be：
The invention has the advantages that：
The experimental rig of modulus change and method are specifically being grasped after in before assessment asphalt immersion of the present invention
When making, the environment in test tank is adjusted by water intaking valve, draining valve and vavuum pump, to simulate test specimen to be measured before immersion, immersion
In and immersion after state, intend the lateral spacing constraints of test specimen to be measured by installing or cancel lateral spacing cylinder mould and constrained without lateral spacing
Condition, changed by environmental cabinet and realize temperature, then be engaged by power set, pressure probe and pressure axis to be measured to measure
The Temperature affection factor of modulus rate of descent and test specimen to be measured after modulus rate of descent, test specimen immersion, simple to operate in test specimen immersion,
It is convenient, while, it is necessary to illustrate, the pressure probe in the present invention is the pressure probe that can provide tunneling boring load, to survey
Measure asphalt in different temperatures tunneling boring load, have lateral spacing constrain and without lateral spacing constrain under soak before in after modulus
Change, and then can be by measuring obtained data assessment bituminous paving anti-water damage property, relatively conventional freeze-thaw split examination
Test, the present invention is simple to operate, and the manpower and materials of test period and input are relatively fewer, while avoids grasping caused by human factor
Make error, the accuracy of assessment is higher.It is further to note that decline of the present invention using modulus in test specimen to be measured immersion
Modulus rate of descent is used as evaluation index after rate and immersion, makes up and existing represents asphalt only with destruction tensile strength
Anti-water damage ability the defects of existing.
Brief description of the drawings
Fig. 1 is structural representation of the invention after installation closed cover 9；
Fig. 2 is structural representation of the invention after installation pressure probe 19；
Fig. 3 is the structural representation of rubber base plate 16 in the present invention；
Fig. 4 is the structural representation of lateral spacing cylinder 7 in the present invention；
Fig. 5 is the structural representation of test tank 8 in the present invention；
Fig. 6 is the structural representation of closed cover 9 in the present invention.
Wherein, 1 it is environmental cabinet, 2 be vavuum pump, 3 be computer, 4 be base, 5 be backup rolls, 6 be bleeding point, 7 is side
Limit cylinder, 8 be test tank, 9 be closed cover, 10 be temperature control device, 11 be pressure axis, 12 be power set, 13 be connector,
14 it is water inlet, 15 be test specimen to be measured, 16 be rubber base plate, 17 be draining valve, 18 be delivery port, 19 is pressure probe, 20
It is extraction valve for annular groove, 21,22 be water intaking valve, 23 is rubber groove.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
With reference to figure 1, it is of the present invention assess asphalt immersion before in after modulus change experimental rig include meter
Calculation machine 3, vavuum pump 2, environmental cabinet 1, the temperature control device 10 for controlling environmental cabinet 1 and the power being arranged in environmental cabinet 1
Device 12, pressure axis 11, lateral spacing cylinder 7, closed cover 9, test tank 8, base 4, backup rolls 5 and tunneling boring load can be provided
Pressure probe 19；Power set 12 are located at the top of environmental cabinet 1, the output end of power set 12 and the upper end of pressure axis 11
It is connected, the lower end of pressure axis 11 is provided with the connector 13 for connecting pressure probe 19 and closed cover 9, closed cover 9
It is covered in the open top of test tank 8, base 4 is located at the bottom of environmental cabinet 1, the upper end of backup rolls 5 and the bottom of test tank 8
Portion is connected, and the lower end of backup rolls 5 is fixed on base 4, and the bottom of test tank 8 is provided with rubber base plate 16,7, lateral spacing cylinder
In on rubber base plate 16, the side of test tank 8 is provided with bleeding point 6, and vavuum pump 2 is connected with the bleeding point 6, test tank 8
Top be provided with the water inlet 14 being connected with external source, the bottom of test tank 8 is provided with delivery port 18, computer 3 with
The output end of pressure probe 19 and the control terminal of power set 12 are connected.
The connector 13 is hickey.Draining valve 17 is provided with the delivery port 18 of test tank 8；Test tank 8 enters
Water intaking valve 22 is provided with the mouth of a river 14；Extraction valve 21 is provided with the bleeding point 6 of test tank 8；Ring is provided with rubber base plate 16
Connected in star 20, the lower end of lateral spacing cylinder 7 are embedded in the annular groove 20；The bottom of closed cover 9 is provided with and test tank 8
The rubber groove 23 that open-topped wall is engaged；Vavuum pump 2 passes through rubber water pipe and the phase of bleeding point 6 on test tank 8
Connection.
The effect of lateral spacing cylinder 7 is to provide lateral spacing in the experiment under have lateral spacing constraints for test specimen 15 to be measured,
In the experiment under have lateral spacing constraints, test specimen 15 to be measured is located in lateral spacing cylinder 7, is carrying out constraining bar without lateral spacing
During experiment under part, test specimen 15 to be measured is placed directly on rubber base plate 16.
During laboratory test, the cylinder specimen being molded using asphalt by rotary compactor is tested, and must be treated
Test block 15, in outdoor test, sampled using drill bit coring, to obtain cylinder specimen, then test specimen 15 to be measured stood one
The section time, make its drying.
It should be noted that pressure probe 19 is the pressure probe 19 that can provide Local Loads.
Embodiment one
The test method of modulus change comprises the following steps after in before assessment asphalt immersion of the present invention：
1a) test specimen 15 to be measured is positioned on rubber base plate 16, then adjusts the temperature in environmental cabinet 1；
2a) pressure probe 19 is installed on connector 13, turns off draining valve 17, water intaking valve 22 and extraction valve 21,
To simulate the state before test specimen 15 to be measured is in immersion, it is 10mm that computer 3, which sets the decrement of test specimen 15 to be measured, and power fills
Put 12 driving pressure axles 11 and treat test block 15 and be compressed, the pressure probe 19 when the decrement of test specimen 15 to be measured is 10mm
It is P to measure obtained pressure value1；The position of pressure axis 11 is reduced, removes pressure probe 19, then closed cover 9 is installed on
On connector 13, then the position of pressure axis 11 is adjusted, closed cover 9 is close to test tank 8 closed, then open extraction valve 21,
Vavuum pump 2 carries out vacuumize process to test tank 8, makes to be in vacuum state in test tank 8, then opens water intaking valve 22, makes the external world
Water in water source is entered in test tank 8, and makes the water level in test tank 8 higher than the top 3cm, Ran Houguan of test specimen 15 to be measured
Water intaking valve 22 is closed, then stands 10min, test specimen 15 to be measured is in water-saturated state, is in simulating test specimen 15 to be measured in immersion
State, the position of pressure axis 11 is then reduced, remove closed cover 9, pressure probe 19 is installed on connector 13, then is set
The decrement for putting test specimen 15 to be measured is 10mm, and the driving pressure axle 11 of power set 12 is treated test block 15 and is further applied load, when treating
It is P that pressure probe 19, which measures obtained pressure value, when the decrement of test block 15 is 10mm2；Then the position of pressure axis 11 is reduced
Put, disconnect vavuum pump 2, open draining valve 17 and extraction valve 21, drain the water in test tank 8, stand 10min, treated with simulation
The state that test block 15 is in after immersion, then compresses test specimen 15 to be measured, when the decrement of test specimen 15 to be measured by pressure axis 11
For 10mm when pressure probe 19 to measure obtained pressure value be P3；
3a) without under lateral spacing constraints, modulus rate of descent α during test specimen 15 to be measured soaks1And after test specimen 15 to be measured soaks
Modulus rate of descent α2For：
Embodiment two
The test method of modulus change comprises the following steps after in before assessment asphalt immersion of the present invention：
1b) lateral spacing cylinder 7 is positioned on rubber base plate 16, then test specimen 15 to be measured is positioned in lateral spacing cylinder 7, is then adjusted
Temperature in whole environmental cabinet 1；
2b) pressure probe 19 is installed on connector 13, turns off draining valve 17, water intaking valve 22 and extraction valve 21,
To simulate the state before test specimen 15 to be measured is in immersion, it is 10mm that computer 3, which sets the decrement of test specimen 15 to be measured, and power fills
Put 12 driving pressure axles 11 and treat test block 15 and be compressed, the pressure probe 19 when the decrement of test specimen 15 to be measured is 10mm
It is P to measure obtained pressure value11；The position of pressure axis 11 is reduced, removes pressure probe 19, then closed cover 9 is installed on
On connector 13, then the position of pressure axis 11 is adjusted, closed cover 9 is close to test tank 8 closed, then open extraction valve 21,
Vavuum pump 2 carries out vacuumize process to test tank 8, makes to be in vacuum state in test tank 8, then opens water intaking valve 22, makes the external world
Water in water source is entered in test tank 8, and makes the water level in test tank 8 higher than the top 3cm, Ran Houguan of test specimen 15 to be measured
Water intaking valve 22 is closed, then stands 10min, test specimen 15 to be measured is in water-saturated state, is in simulating test specimen 15 to be measured in immersion
State, the position of pressure axis 11 is then reduced, remove closed cover 9, pressure probe 19 is installed on connector 13, then is set
The decrement for putting test specimen 15 to be measured is 10mm, and the driving pressure axle 11 of power set 12 is treated test block 15 and is further applied load, when treating
It is P that pressure probe 19, which measures obtained pressure value, when the decrement of test block 15 is 10mm21；Then the position of pressure axis 11 is reduced
Put, disconnect vavuum pump 2, open draining valve 17 and extraction valve 21, drain the water in test tank 8, stand 10min, treated with simulation
The state that test block 15 is in after immersion, then compresses test specimen 15 to be measured, when the decrement of test specimen 15 to be measured by pressure axis 11
For 10mm when pressure probe 19 to measure obtained pressure value be P31；
3b) obtain under lateral spacing constraints, modulus rate of descent α during test specimen 15 to be measured soaks11And the immersion of test specimen 15 rear mold to be measured
Measure rate of descent α21For：
Embodiment three
The test method of modulus change comprises the following steps after in before assessment asphalt immersion of the present invention：
1c) test specimen 15 to be measured is positioned on rubber base plate 16, the temperature in environmental cabinet 1 is then adjusted, makes environmental cabinet 1
Interior temperature is T1；
2c) pressure probe 19 is installed on connector 13, turns off draining valve 17, water intaking valve 22 and extraction valve 21,
To simulate the state before test specimen 15 to be measured is in immersion, it is 10mm that computer 3, which sets the decrement of test specimen 15 to be measured, and power fills
Put 12 driving pressure axles 11 and treat test block 15 and be compressed, the pressure probe 19 when the decrement of test specimen 15 to be measured is 10mm
It is P to measure obtained pressure value12, the position of pressure axis 11 is reduced, removes pressure probe 19, then closed cover 9 is installed on
On connector 13, then the position of pressure axis 11 is adjusted, closed cover 9 is close to test tank 8 closed, then open extraction valve 21,
Vavuum pump 2 carries out vacuumize process to test tank 8, makes to be in vacuum state in test tank 8, then opens water intaking valve 22, makes the external world
Water in water source is entered in test tank 8, and makes the water level in test tank 8 higher than the top 3cm, Ran Houguan of test specimen 15 to be measured
Water intaking valve 22 is closed, then stands 10min, test specimen 15 to be measured is in water-saturated state, is in simulating test specimen 15 to be measured in immersion
State, the position of pressure axis 11 is then reduced, remove closed cover 9, pressure probe 19 is installed on connector 13, then is set
The decrement for putting test specimen 15 to be measured is 10mm, and the driving pressure axle 11 of power set 12 is treated test block 15 and is further applied load, when treating
It is P that pressure probe 19, which measures obtained pressure value, when the decrement of test block 15 is 10mm22；Then the position of pressure axis 11 is reduced
Put, disconnect vavuum pump 2, open draining valve 17 and extraction valve 21, drain the water in test tank 8, stand 10min, treated with simulation
The state that test block 15 is in after immersion, then compresses test specimen 15 to be measured, when the decrement of test specimen 15 to be measured by pressure axis 11
For 10mm when pressure probe 19 to measure obtained pressure value be P32；
It is T 3c) to obtain temperature1When, under without lateral spacing constraints, modulus rate of descent α during test specimen 15 to be measured soaks12And treat
Modulus rate of descent α after test block 15 soaks22For：
4c) from test specimen 15 to be measured is newly chosen, the temperature in environmental cabinet 1 is then adjusted to T2, repeat step 2c) and
3c), it is T to obtain temperature2When, under without lateral spacing constraints, modulus rate of descent α during test specimen 15 to be measured soaks1' and test specimen to be measured 15
Modulus rate of descent α after immersion2', then the Temperature affection factor λ of test specimen 15 to be measured is：
Claims (9)
1. the experimental rig of modulus change after in before a kind of assessment asphalt immersion, it is characterised in that including computer
(3), vavuum pump (2), environmental cabinet (1), the temperature control device (10) for controlling environmental cabinet (1) and it is arranged in environmental cabinet (1)
Power set (12), pressure axis (11), lateral spacing cylinder (7), closed cover (9), test tank (8), base (4), backup rolls (5) and
The pressure probe (19) of tunneling boring load can be provided；
Power set (12) are located at the top of environmental cabinet (1), the output end and the upper end phase of pressure axis (11) of power set (12)
Connection, the lower end of pressure axis (11) are provided with the connector (13) for connecting pressure probe (19) and closed cover (9), closing
Cover plate (9) is covered in the open top of test tank (8), and base (4) is located at the bottom of environmental cabinet (1), the upper end of backup rolls (5)
It is connected with the bottom of test tank (8), the lower end of backup rolls (5) is fixed on base (4), and the bottom of test tank (8) is provided with
Rubber base plate (16), lateral spacing cylinder (7) are located on rubber base plate (16), and the side of test tank (8) is provided with bleeding point (6), vacuum
Pump (2) is connected with the bleeding point (6), and the water inlet (14) being connected with external source is provided with the top of test tank (8),
The bottom of test tank (8) is provided with delivery port (18), the output end and power set (12) of computer (3) and pressure probe (19)
Control terminal be connected.
2. the experimental rig of modulus change, its feature exist after in before assessment asphalt immersion according to claim 1
In the connector (13) is hickey.
3. the experimental rig of modulus change, its feature exist after in before assessment asphalt immersion according to claim 2
In,
Delivery port (18) place of test tank (8) is provided with draining valve (17)；
Water inlet (14) place of test tank (8) is provided with water intaking valve (22)；
Bleeding point (6) place of test tank (8) is provided with extraction valve (21).
4. the experimental rig of modulus change, its feature exist after in before assessment asphalt immersion according to claim 1
In being provided with annular groove (20) on rubber base plate (16), the lower end of lateral spacing cylinder (7) is embedded in the annular groove (20).
5. the experimental rig of modulus change, its feature exist after in before assessment asphalt immersion according to claim 1
In the bottom of closed cover (9) is provided with the rubber groove (23) being engaged with test tank (8) open-topped wall.
6. the experimental rig of modulus change, its feature exist after in before assessment asphalt immersion according to claim 1
In vavuum pump (2) is connected by rubber water pipe with the bleeding point (6) on test tank (8).
7. the test method of modulus change after in before a kind of assessment asphalt immersion, it is characterised in that based on claim 2
The experimental rig of modulus change, comprises the following steps after in before described assessment asphalt immersion：
1a) test specimen to be measured (15) is positioned on rubber base plate (16), then adjusts the temperature in environmental cabinet (1)；
2a) pressure probe (19) is installed on connector (13), turns off draining valve (17), water intaking valve (22) and extraction valve
(21), to simulate the state before test specimen to be measured (15) is in immersion, the decrement of computer (3) setting test specimen (15) to be measured is
10mm, power set (12) driving pressure axle (11) is treated test block (15) and is compressed, when the decrement of test specimen to be measured (15)
For 10mm when the obtained pressure value of pressure probe (19) measurement be P1；The position of pressure axis (11) is reduced, removes pressure probe
(19), then by closed cover (9) be installed on connector (13), then adjust the position of pressure axis (11), make closed cover (9) with
Test tank (8) is close to closed, then opens extraction valve (21), vavuum pump (2) carries out vacuumize process to test tank (8), makes experiment
Vacuum state is in pond (8), then opens water intaking valve (22), the water in external source is entered in test tank (8), and make examination
The water level tested in pond (8) is higher than the top 3cm of test specimen to be measured (15), is then shut off water intaking valve (22), then stands 10min, makes to treat
Test block (15) is in water-saturated state, to simulate the state that test specimen to be measured (15) is in immersion, then reduces pressure axis (11)
Position, remove closed cover (9), pressure probe (19) is installed on connector (13), then test specimen to be measured (15) is set
Decrement is 10mm, and power set (12) driving pressure axle (11) is treated test block (15) and is further applied load, when test specimen to be measured (15)
The decrement pressure value that pressure probe (19) measurement obtains when being 10mm be P2；Then the position of pressure axis (11) is reduced, is broken
Vavuum pump (2) is driven, draining valve (17) and extraction valve (21) is opened, drains the water in test tank (8), stands 10min, with simulation
The state that test specimen (15) to be measured is in after immersion, test specimen (15) to be measured is then compressed by pressure axis (11), when test specimen to be measured
(15) pressure value that pressure probe (19) measurement obtains when decrement is 10mm is P3；
3a) without under lateral spacing constraints, modulus rate of descent α in test specimen (15) immersion to be measured1And test specimen (15) immersion rear mold to be measured
Measure rate of descent α2For：
8. the test method of modulus change after in before a kind of assessment asphalt immersion, it is characterised in that based on claim 2
The experimental rig of modulus change, comprises the following steps after in before described assessment asphalt immersion：
1b) lateral spacing cylinder (7) is positioned on rubber base plate (16), then test specimen to be measured (15) is positioned in lateral spacing cylinder (7), then
Adjust the temperature in environmental cabinet (1)；
2b) pressure probe (19) is installed on connector (13), turns off draining valve (17), water intaking valve (22) and extraction valve
(21), to simulate the state before test specimen to be measured (15) is in immersion, the decrement of computer (3) setting test specimen (15) to be measured is
10mm, power set (12) driving pressure axle (11) is treated test block (15) and is compressed, when the decrement of test specimen to be measured (15)
For 10mm when the obtained pressure value of pressure probe (19) measurement be P11；The position of pressure axis (11) is reduced, removes pressure probe
(19), then by closed cover (9) be installed on connector (13), then adjust the position of pressure axis (11), make closed cover (9) with
Test tank (8) is close to closed, then opens extraction valve (21), vavuum pump (2) carries out vacuumize process to test tank (8), makes experiment
Vacuum state is in pond (8), then opens water intaking valve (22), the water in external source is entered in test tank (8), and make examination
The water level tested in pond (8) is higher than the top 3cm of test specimen to be measured (15), is then shut off water intaking valve (22), then stands 10min, makes to treat
Test block (15) is in water-saturated state, to simulate the state that test specimen to be measured (15) is in immersion, then reduces pressure axis (11)
Position, remove closed cover (9), pressure probe (19) is installed on connector (13), then test specimen to be measured (15) is set
Decrement is 10mm, and power set (12) driving pressure axle (11) is treated test block (15) and is further applied load, when test specimen to be measured (15)
The decrement pressure value that pressure probe (19) measurement obtains when being 10mm be P21；Then the position of pressure axis (11) is reduced, is broken
Vavuum pump (2) is driven, draining valve (17) and extraction valve (21) is opened, drains the water in test tank (8), stands 10min, with simulation
The state that test specimen (15) to be measured is in after immersion, test specimen (15) to be measured is then compressed by pressure axis (11), when test specimen to be measured
(15) pressure value that pressure probe (19) measurement obtains when decrement is 10mm is P31；
3b) obtain under lateral spacing constraints, modulus rate of descent α in test specimen (15) immersion to be measured11And test specimen (15) immersion rear mold to be measured
Measure rate of descent α21For：
9. the test method of modulus change after in before a kind of assessment asphalt immersion, it is characterised in that based on claim 2
The experimental rig of modulus change, comprises the following steps after in before described assessment asphalt immersion：
1c) test specimen to be measured (15) is positioned on rubber base plate (16), the temperature in environmental cabinet (1) is then adjusted, makes environmental cabinet
(1) temperature in is T1；
2c) pressure probe (19) is installed on connector (13), turns off draining valve (17), water intaking valve (22) and extraction valve
(21), to simulate the state before test specimen to be measured (15) is in immersion, the decrement of computer (3) setting test specimen (15) to be measured is
10mm, power set (12) driving pressure axle (11) is treated test block (15) and is compressed, when the decrement of test specimen to be measured (15)
For 10mm when the obtained pressure value of pressure probe (19) measurement be P12, the position of reduction pressure axis (11), remove pressure probe
(19), then by closed cover (9 are installed on connector (13), then adjust the position of pressure axis (11), make closed cover (9) with
Test tank (8) is close to closed, then opens extraction valve (21), vavuum pump (2) carries out vacuumize process to test tank (8), makes experiment
Vacuum state is in pond (8), then opens water intaking valve (22), the water in external source is entered in test tank (8), and make examination
The water level tested in pond (8) is higher than the top 3cm of test specimen to be measured (15), is then shut off water intaking valve (22), then stands 10min, makes to treat
Test block (15) is in water-saturated state, to simulate the state that test specimen to be measured (15) is in immersion, then reduces pressure axis (11)
Position, remove closed cover (9), pressure probe (19) is installed on connector (13), then test specimen to be measured (15) is set
Decrement is 10mm, and power set (12) driving pressure axle (11) is treated test block (15) and is further applied load, when test specimen to be measured (15)
The decrement pressure value that pressure probe (19) measurement obtains when being 10mm be P22；Then the position of pressure axis (11) is reduced, is broken
Vavuum pump (2) is driven, draining valve (17) and extraction valve (21) is opened, drains the water in test tank (8), stands 10min, with simulation
The state that test specimen (15) to be measured is in after immersion, test specimen (15) to be measured is then compressed by pressure axis (11), when test specimen to be measured
(15) pressure value that pressure probe (19) measurement obtains when decrement is 10mm is P32；
It is T 3c) to obtain temperature1When, under without lateral spacing constraints, modulus rate of descent α in test specimen (15) immersion to be measured12It is and to be tested
Modulus rate of descent α after part (15) immersion22For：
4c) from test specimen to be measured (15) is newly chosen, the temperature in environmental cabinet (1) is then adjusted to T2, repeat step 2c) and 3c),
It is T to obtain temperature2When, under without lateral spacing constraints, modulus rate of descent α in test specimen (15) immersion to be measured1′And test specimen (15) to be measured
Modulus rate of descent α after immersion2′, then the Temperature affection factor λ of test specimen (15) to be measured be：
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| CN108709757A (en) * | 2018-06-21 | 2018-10-26 | 江苏远致达轨道交通发展有限公司 | A kind of rail traffic detection device |
| CN108871962A (en) * | 2018-04-24 | 2018-11-23 | 上海大学 | The soil sample unconfined compression test device of controllable suction |
| CN109470570A (en) * | 2018-11-26 | 2019-03-15 | 山东科技大学 | A kind of water oil isolated form immersion triaxial test case and test method |
| CN112098628A (en) * | 2020-09-16 | 2020-12-18 | 哈尔滨工业大学 | Multifunctional soil tank for comprehensive test of lunar soil performance |
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| CN107063884A (en) * | 2016-12-15 | 2017-08-18 | 东南大学 | A kind of lower experimental provision and test method for evaluating porous asphalt pavement high-temperature behavior of multi- scenarios method effect |
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| CN101216401A (en) * | 2008-01-09 | 2008-07-09 | 华南理工大学 | Asphalt mixture hydrodynamic pressure scouring test methods and apparatus |
| CN202870088U (en) * | 2012-09-26 | 2013-04-10 | 长安大学 | Device for testing water stability of asphalt mixture |
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| CN107807044B (en) | 2020-07-28 |
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