CN108181451A - The device and method that performance of asphalt mixture influences under a kind of assessment Frozen-thawed cycled - Google Patents
The device and method that performance of asphalt mixture influences under a kind of assessment Frozen-thawed cycled Download PDFInfo
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- CN108181451A CN108181451A CN201810095240.2A CN201810095240A CN108181451A CN 108181451 A CN108181451 A CN 108181451A CN 201810095240 A CN201810095240 A CN 201810095240A CN 108181451 A CN108181451 A CN 108181451A
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Abstract
The invention discloses a kind of experimental rigs for realizing the processing of asphalt Frozen-thawed cycled to include support system, jacking system, household freezer, water bath, glass outer, and pedestal supports entire mechanism arrangement.Support system is made of column, crossbeam and guide rail.Jacking system is made of pulley, elevator, steel strand wires, sample storehouse, objective table and controller.Household freezer is made of the first shell, air inlet pipe, the first rebound bail, hollow cup, the first support platform, air outlet pipe, the first asbestos washer and refrigerator.Water bath is made of second housing, the second rebound bail, Water Tank with Temp.-controlled, the second support platform, the second asbestos washer and heater.The invention discloses Frozen-thawed cycled to the evaluation method, evaluation index and evaluation criteria of asphalt compression strength and Influence of Fatigue Properties.The present invention, which has not only filled up caused Frozen-thawed cycled under water and temperature double factor, influences performance of asphalt mixture the blank of research, also has the characteristics that result of the test is reliable, reference value is high.
Description
Technical field
The invention belongs to highway engineering pitch and Asphalt Mixture Experiment engineering device technique fields, and in particular to be used for one kind
Evaluate the experimental rig and method that performance of asphalt mixture influences under Frozen-thawed cycled.
Background technology
Bituminous paving in the road engineering created in China due to good pavement performance and durability, receiving
It welcomes.With the continuous development of China's infrastructure construction in recent years, it will have more roads using asphalt as
Its surface layer structure.
For seasonal frost zone, in winter since asphalt is chronically in water and temperature alternating changing environment,
Freeze thawing damage phenomenon is more universal.Road surface to decline the contraction fissure generated since there are load Cracks or temperature, is dropping
Under the effect of the extraneous factors such as water, traffic loading, unfreezing can accelerate the destruction on road surface.Therefore, it is damaged caused by unfreezing,
One of principal element of damage of bituminous pavement is become.However, road worker under moisture and temperature double factor about causing
Frozen-thawed cycled to influence research on the performance of asphalt less, except considering freeze thawing shadow when evaluating mixture water stability
It rings, other indexs are not directed to influence of the freeze thawing to mixture performance index.Therefore, Research on Asphalt Mixture is in temperature change
There is profound significance with freeze thawing impact analysis caused by moisture double factor.
In conclusion being studied by carrying out thawing cyclic test in asphalt room, multigelation can be obtained
Bituminous paving destruction characteristic and material property Decay Law under cycling condition.For the severe feature of winter Changes in weather, Ke Yitong
It crosses and takes highway precuring maintaining method, improve the ability of reply burst fire-disaster weather and improve Pavement Condition and extension
Years Of Service ensures highway transportation ability, has larger economic benefit and social benefit.
Invention content
For the shortcoming of existing research, the present invention, which has put forward one kind, can realize that asphalt Frozen-thawed cycled is handled
Experimental rig and evaluation Frozen-thawed cycled under performance of asphalt mixture influence test method, so as to be provided for engineering practice
Practicable instruction reaches and improves the pavement performance of asphalt roads, saves later stage cost of investment and extend road occupation
The purpose in service life.
A kind of asphalt Frozen-thawed cycled processing unit includes support system, jacking system, household freezer, water bath, glass
Glass outer cover, pedestal are used for supporting entire mechanism arrangement.
Support system is made of column, crossbeam and guide rail.
Column connect base, for support beam and jacking system.Crossbeam, which is equipped with, can make what pulley horizontally slipped to lead
Rail, pulley can drive jacking system to be moved left and right.
Jacking system is made of pulley, elevator, steel strand wires, sample storehouse, objective table and controller.
Pulley can be by the weight transmitting in elevator below and sample storehouse to crossbeam.Elevator passes through the receipts to steel strand wires
Put the lifting for realizing sample storehouse, the objective table in sample storehouse is used for placing the experiment test specimen for treating freeze thawing treatment.Controller can be controlled
The working condition of pulley and elevator processed, the duration that experiment test specimen can also be set to be handled in household freezer and water bath.
Household freezer is by the first shell, air inlet pipe, the first rebound bail, hollow cup, the first support platform, air outlet pipe, first
Asbestos washer and refrigerator composition.
First shell can realize household freezer in the system to form a transparent, constant temperature and closing of being isolated from the outside.First
Rebound bail ensures that sample storehouse can freely pass in and out household freezer.The cryogenic gas of chilled machine processing is controlled in first entering along air inlet pipe
It in cup, then is back in refrigerator through air outlet pipe, so as to fulfill to the experiment test specimen freezing processing in the first support platform.First
Asbestos washer can make the air themperature in hollow cup uniform, hollow cup can also be avoided to be in direct contact refrigerator, to hollow cup
It plays a protective role.Refrigerator mainly carries out low temperature control to household freezer, and makes the temperature in household freezer to test institute
Certain steady state value needed.
Refrigerator is made of the first power switch, the first temperature regulation switch and the first display screen.
First power switch can control the working condition of refrigerator, and the first temperature regulation switch can set refrigeration test
Required a certain temperature.First display screen can show temperature and total operating time in any time household freezer.
Water bath is by second housing, the second rebound bail, Water Tank with Temp.-controlled, the second support platform, the second asbestos washer and adds
Heat engine forms.
Second housing can realize that water bath is isolated from the outside the system to form a transparent, constant temperature and closing.Second time
It plays bail and ensures that sample storehouse can freely pass in and out water bath.Second asbestos washer can be heated evenly the water in Water Tank with Temp.-controlled,
Water Tank with Temp.-controlled Direct Contact Heating machine can also be avoided, is played a protective role to Water Tank with Temp.-controlled.Heater mainly pair plus
Hot tank carries out high-temperature control, and the temperature in heater box is made to be certain steady state value needed for experiment, so as to fulfill in support platform
Experiment test specimen high temperature bath processing.
Heater is switched by second source, second temperature regulating switch and second display screen form.
Second source switchs the working condition that can control heater, and second temperature regulating switch can set high temperature bath
Required a certain temperature.Second display screen can show temperature and total operating time in any time heater box.
Glass outer can ensure that whole device is isolated from the outside to form a transparent, constant temperature and closing during experiment
System.Meanwhile it can observe, record the experimental phenomena and Control experiment process of the processing of asphalt Frozen-thawed cycled.
The test method and evaluation index of the present invention：
1. the experimental study that Frozen-thawed cycled influences asphalt compression strength
(1) test method
The mainly pretreatment including test specimen, the Frozen-thawed cycled processing of test specimen and the performance test three of test specimen of this test method
Aspect.
The pretreatment of test specimen：
It takes a diameter of 100mm of hydrostatic profile, be highly the asphalt cylinder test specimen 15 of 100mm, be divided into five
Group is denoted as the 1st group, the 2nd group, the 3rd group, the 4th group, the 5th group, wherein the 1st group is used as blank sample, without Frozen-thawed cycled processing.
First by the soaked 2~3d of remaining four groups of test specimens, then will be soaked after test specimen be put into polybag, the water filling into polybag is used in combination
Cord tightens polybag sack, and polybag (test specimen) is lain against in insulating box to treat that further Frozen-thawed cycled is handled.
The Frozen-thawed cycled processing of test specimen：
First, the first power switch in refrigerator is opened, temperature is set as -15 DEG C by the first temperature regulation switch,
The second source switch in heater is opened simultaneously, is opened by second temperature adjusting and temperature is set as 40 DEG C, keep this work shape
State 15min, so that it is guaranteed that the first display screen displays temperature of refrigerator is -15 DEG C, the second display screen displays temperature of heater
It is 40 DEG C.
Then, glass outer is opened, four groups of test specimens after pretreatment are successively placed on the objective table in sample storehouse and closed
Close glass outer.The pulley of controller control at this time slides into left end along guide rail, and elevator is controlled to start to discharge steel strand wires extremely
Sample storehouse is dropped in the first support platform in household freezer, starts to carry out test specimen the freezing processing of 2.5h.Treat that test specimen passes through
After the freezing processing of 2.5h, controller, which first controls elevator to shrink steel strand wires, makes sample storehouse rise to initial position, then control cunning
Wheel slides into right end along guide rail, and elevator release steel strand wires to sample storehouse is finally controlled to drop to the second support in water bath
On platform, the high temperature bath for starting to carry out test specimen 1.5h at this time is handled.After test specimen completes the high temperature bath processing of 1.5h, control
Device control elevator processed, which shrinks steel strand wires, makes sample storehouse rise to initial position, then pulley is controlled to slide into left end along guide rail.
So far the frozen-thaw process of a test specimen is completed, subsequent Frozen-thawed cycled repeats more than flow until all test specimens are completed to make a reservation for
Frozen-thawed cycled number of processes, finally open glass outer take out test specimen, close glass outer terminate at the Frozen-thawed cycled of test specimen
Reason process.Whole process is by controller intelligent control simultaneously, without human intervention.Wherein the 2nd group of test specimen presets 5 Frozen-thawed cycleds
Processing, the 3rd group of test specimen preset 10 Frozen-thawed cycled processing, and the 4th group of test specimen presets 15 Frozen-thawed cycled processing, and the 5th group of test specimen is pre-
If 20 Frozen-thawed cycled processing.
Finally, the test specimen handled through pre-determined number Frozen-thawed cycled is placed in the baking oven that temperature is 25 DEG C and place is dried
Reason, in case subsequent performance test uses.
The performance test of test specimen：
According to the compressive strength test regulation of asphalt, the 1st group of test specimen, the warp to being handled without Frozen-thawed cycled respectively
2nd group of test specimen of 5 Frozen-thawed cycleds processing, the 3rd group of test specimen through 10 Frozen-thawed cycleds processing, through 15 Frozen-thawed cycleds processing
4th group of test specimen and the 5th group of test specimen progress compressive strength test through 20 Frozen-thawed cycled processing, measure its corresponding resistance to compression respectively
Intensity is RC1、RC2、RC3、RC4 and RC5。
(2) evaluation index
Loss of strength factor alpha is calculated using the data that experiment measures, by the size for analyzing experiment calculation value and reference point
To reflect the decay situation of asphalt compression strength under Frozen-thawed cycled.
Wherein：Loss of strength factor alpha=1-RCi/RC1 (i=2,3,4,5)
Loss of strength evaluation criteria
| Loss of strength factor alpha | 0~0.1 | 0.1~0.25 | 0.25~0.5 | 0.5~0.75 | 0.75~1.0 |
| Evaluation number | 5 | 4 | 3 | 2 | 1 |
| Opinion rating | It is excellent | It is good | In | Difference | It is very poor |
2. the experimental study that Frozen-thawed cycled influences fatigue performance of asphalt mixture
(1) test method
The mainly pretreatment including test specimen, the Frozen-thawed cycled processing of test specimen and the performance test three of test specimen of this test method
Aspect.
The pretreatment of test specimen can refer to the processing procedure in case study on implementation 1, and test specimen is changed to rolling and is molded a length of 380mm, thickness
The asphalt girder 15 for being 63.5mm for 50mm, width.
The Frozen-thawed cycled processing of test specimen can refer to " experimental study that Frozen-thawed cycled influences asphalt compression strength "
Processing procedure.
The performance test of test specimen：
According to the experiment on fatigue properties regulation of asphalt, the 1st group of test specimen, the warp to being handled without Frozen-thawed cycled respectively
2nd group of test specimen of 5 Frozen-thawed cycleds processing, the 3rd group of test specimen through 10 Frozen-thawed cycleds processing, through 15 Frozen-thawed cycleds processing
4th group of test specimen and the 5th group of test specimen progress four-point bending fatigue life test research through 20 Frozen-thawed cycled processing, test temperature
It it is 15 DEG C, loading frequency 10Hz, using strain controlling pattern, strain level is 500 × 10-6.Fatigue criteria is material
Stiffness modulus reaches the 50% of initial stiffness modulus, and the loading number that material is undergone at this time is as experiment times of fatigue.Then pass through
Asphalt mixture fatigue testing result is denoted as K1, K2, K3, K4 and K5 after Frozen-thawed cycled.
(2) evaluation index
Antifatigue loss index β is calculated using the data that experiment measures, is reflected by analyzing the size of experiment calculation value
The influence degree of Asphalt Mixtures Fatigue Properties under Frozen-thawed cycled.
Wherein：Antifatigue loss index β=1-Ki/K1(i=2,3,4,5)
Antifatigue appraisal of damage standard
| Antifatigue loss index β | 0~0.25 | 0.25~0.5 | 0.5~0.75 | 0.75~1.0 |
| Evaluation number | 4 | 3 | 2 | 1 |
| Opinion rating | Well | Generally | Difference | It is very poor |
Description of the drawings
Fig. 1 is the Frozen-thawed cycled processing unit figure of the present invention.
In Fig. 1,1 is pedestal, and 2 be glass outer, and 3 be column, and 4 be household freezer, and 5 be crossbeam, and 6 be pulley, and 7 is lead
Rail, 8 be elevator, and 9 be steel strand wires, and 10 be sample storehouse, and 11 be objective table, and 12 devices in order to control, 13 be water bath.
Fig. 2 is the household freezer installation drawing of the present invention.
In fig. 2,4-1 is the first shell, and 4-2 is air inlet pipe, and 4-3 is the first rebound card needle, and 4-4 is hollow cup, and 4-5 is
First support platform, 4-6 are air outlet pipe, and 4-7 is the first asbestos washer, and 4-8 is refrigerator, and 4-8-1 is the first power switch, 4-
8-2 is the first temperature regulation switch, and 4-8-3 is the first display screen.
Fig. 3 is the water bath installation drawing of the present invention.
In figure 3,13-1 is second housing, and 13-2 is the second rebound card needle, and 13-3 is Water Tank with Temp.-controlled, and 13-4 is second
Platform is supportted, 13-5 is stone the second cotton pad piece, and 13-6 heaters, 13-6-1 is second source switch, and 13-6-2 is second temperature tune
Section switch, 13-6-3 is second display screen.
Specific embodiment
The present invention is described in more detail with reference to the accompanying drawings and examples, but the present invention is not limited to these Examples.
Implement one：The experimental study that Frozen-thawed cycled influences asphalt compression strength
(1) test method
The mainly pretreatment including test specimen, the Frozen-thawed cycled processing of test specimen and the performance test three of test specimen of this test method
Aspect.
The pretreatment of test specimen：
It takes a diameter of 100mm of hydrostatic profile, be highly the asphalt cylinder test specimen 15 of 100mm, be divided into five
Group is denoted as the 1st group, the 2nd group, the 3rd group, the 4th group, the 5th group, wherein the 1st group is used as blank sample, without Frozen-thawed cycled processing.
First by the soaked 2~3d of remaining four groups of test specimens, then will be soaked after test specimen be put into polybag, the water filling into polybag is used in combination
Cord tightens polybag sack, and polybag (test specimen) is lain against in insulating box to treat that further Frozen-thawed cycled is handled.
The Frozen-thawed cycled processing of test specimen：
First, the first power switch 4-8-1 in refrigerator 4-8 is opened, it will be warm by the first temperature regulation switch 4-8-2
Degree is set as -15 DEG C, opens simultaneously the second source switch 13-6-1 in heater 13-6, passes through second temperature regulating switch
Temperature is set as 40 DEG C by 13-6-2, keeps this working condition 15min, so that it is guaranteed that the first display screen 4-8-3 in refrigerator 4-8
Displays temperature is -15 DEG C, and the second display screen 13-6-3 displays temperatures in heater 13-6 are 40 DEG C.
Then, glass outer 2 is opened, four groups of test specimens after pretreatment are successively placed on the objective table 11 in sample storehouse 10
And close glass outer 2.Controller 12 controls pulley 6 to slide into left end along guide rail 7, and elevator 8 is controlled to start to release at this time
Steel strand wires 9 are put until sample storehouse 10 drops on the first support platform 4-5 in household freezer 4, start to carry out 2.5h to test specimen
Freezing processing.After test specimen after the freezing processing of 2.5h, controller 12, which first controls elevator 8 to shrink steel strand wires 9, makes sample storehouse 10
Initial position is risen to, then pulley 6 is controlled to slide into right end along guide rail 7, elevator 8 is finally controlled to discharge steel strand wires 9 to examination
Sample storehouse 10 is dropped on the second support platform 13-4 in water bath 13, starts to carry out test specimen at the high temperature bath of 1.5h at this time
Reason.After test specimen completes the high temperature bath processing of 1.5h, controller 12, which controls elevator 8 to shrink steel strand wires 9, to be made on sample storehouse 10
Initial position is risen to, then pulley 6 is controlled to slide into left end along guide rail 7.So far the frozen-thaw process of a test specimen is completed, it is subsequent
Frozen-thawed cycled repeats more than flow until all test specimens complete scheduled Frozen-thawed cycled number of processes, later outside opening glass
Cover 2 takes out test specimen, closes the Frozen-thawed cycled processing procedure that glass outer 2 terminates test specimen.Whole process is by controller intelligence simultaneously
Control, without human intervention.Wherein the 2nd group of test specimen presets 5 Frozen-thawed cycled processing, and the 3rd group of test specimen presets 10 Frozen-thawed cycleds
Processing, the 4th group of test specimen preset 15 Frozen-thawed cycled processing, and the 5th group of test specimen presets 20 Frozen-thawed cycled processing.
Finally, the test specimen handled through pre-determined number Frozen-thawed cycled is placed in the baking oven that temperature is 25 DEG C and place is dried
Reason, in case subsequent performance test uses.
The performance test of test specimen：
According to the compressive strength test regulation of asphalt, the 1st group of test specimen, the warp to being handled without Frozen-thawed cycled respectively
2nd group of test specimen of 5 Frozen-thawed cycleds processing, the 3rd group of test specimen through 10 Frozen-thawed cycleds processing, through 15 Frozen-thawed cycleds processing
4th group of test specimen and the 5th group of test specimen progress compressive strength test through 20 Frozen-thawed cycled processing, measure its corresponding resistance to compression respectively
Intensity is RC1、RC2、RC3、RC4 and RC5。
(2) evaluation index
Loss of strength factor alpha is calculated using the data that experiment measures, by the size for analyzing experiment calculation value and reference point
To reflect the decay situation of asphalt compression strength under Frozen-thawed cycled.Its experiment calculation result can refer to table 1.Wherein：By force
Spend loss coefficient α=1-RCi/RC1 (i=2,3,4,5)
1 loss of strength evaluation criteria of table
| Loss of strength factor alpha | 0~0.1 | 0.1~0.2 | 0.2~0.3 | 0.3~0.4 | 0.4~1.0 |
| Evaluation number | 5 | 4 | 3 | 2 | 1 |
| Opinion rating | It is excellent | It is good | In | Difference | It is very poor |
Implement two：The experimental study that Frozen-thawed cycled influences fatigue performance of asphalt mixture
(1) test method
The mainly pretreatment including test specimen, the Frozen-thawed cycled processing of test specimen and the performance test three of test specimen of this test method
Aspect.
The pretreatment of test specimen can refer to the processing procedure in case study on implementation 1, and test specimen is changed to rolling and is molded a length of 380mm, thickness
The asphalt girder test specimen 15 for being 63.5mm for 50mm, width.
The Frozen-thawed cycled processing of test specimen can refer to the processing procedure in case study on implementation 1.
The performance test of test specimen：
According to the experiment on fatigue properties regulation of asphalt, the 1st group of test specimen, the warp to being handled without Frozen-thawed cycled respectively
2nd group of test specimen of 5 Frozen-thawed cycleds processing, the 3rd group of test specimen through 10 Frozen-thawed cycleds processing, through 15 Frozen-thawed cycleds processing
4th group of test specimen and the 5th group of test specimen progress four-point bending fatigue life test research through 20 Frozen-thawed cycled processing, test temperature
It it is 15 DEG C, loading frequency 10Hz, using strain controlling pattern, strain level is 500 × 10-6.Fatigue criteria is material
Stiffness modulus reaches the 50% of initial stiffness modulus, and the loading number that material is undergone at this time is as experiment times of fatigue.Then pass through
Asphalt mixture fatigue testing result is denoted as K1, K2, K3, K4 and K5 after Frozen-thawed cycled.
(2) evaluation index
Antifatigue loss index β is calculated using the data that experiment measures, is reflected by analyzing the size of experiment calculation value
The influence degree of Asphalt Mixtures Fatigue Properties under Frozen-thawed cycled.Its experiment calculation result can refer to table 2.Wherein：It is antifatigue
Loss index β=1-Ki/K1(i=2,3,4,5)
2 antifatigue appraisal of damage standard of table
| Antifatigue loss index β | 0~0.25 | 0.25~0.5 | 0.5~0.75 | 0.75~1.0 |
| Evaluation number | 4 | 3 | 2 | 1 |
| Opinion rating | Well | Generally | Difference | It is very poor |
Claims (9)
1. a kind of asphalt Frozen-thawed cycled processing unit, which is characterized in that including support system, jacking system, household freezer
(4), water bath (13), glass outer (2), pedestal (1) is for supporting entire mechanism arrangement.
2. asphalt Frozen-thawed cycled processing unit according to claim 1, which is characterized in that support system includes vertical
Column (3), crossbeam (5) and guide rail (7), wherein, column (3) is fixed on pedestal (1) upper end, and crossbeam (5) is fixed on the top of column (3)
End, guide rail (7) are fixed in the middle part of crossbeam (5).
3. asphalt Frozen-thawed cycled processing unit according to claim 1, which is characterized in that jacking system includes sliding
(6), elevator (8), steel strand wires (9), sample storehouse (10), objective table (11) and controller (12) are taken turns, wherein, pulley (6) is fixed
Between two guide rails (7), elevator (8) is fixed on the wheel shaft position of pulley (6), and steel strand wires (9) are fixed on elevator (8) and examination
Between sample storehouse (10), objective table (11) is fixed on sample storehouse (10) inside, and controller (12) is fixed on the lower end of crossbeam (5).
4. asphalt Frozen-thawed cycled processing unit according to claim 1, which is characterized in that household freezer (4) includes
First shell (4-1), the first rebound bail (4-3), hollow cup (4-4), the first support platform (4-5), goes out air inlet pipe (4-2)
Tracheae (4-6), the first asbestos washer (4-7) and refrigerator (4-8), wherein, the first rebound bail (4-3) is fixed on the first shell
The upper end of (4-1), refrigerator (4-8) be fixed on the first shell (4-1) bottom, air inlet pipe (4-2) and air outlet pipe (4-6) respectively at
The left side of refrigerator (4-8) connects hollow cup (4-4) with right side, the first asbestos washer (4-7) be fixed on refrigerator (4-8) and in
Between empty cup (4-4), it is internal that the first support platform (4-5) is fixed on hollow cup (4-4).
5. asphalt Frozen-thawed cycled processing unit according to claim 1, which is characterized in that water bath (13) includes
Second housing (13-1), the second rebound bail (13-2), Water Tank with Temp.-controlled (13-3), the second support platform (13-4), the second asbestos
Gasket (13-5) and heater (13-6), wherein, the second rebound bail (13-2) is fixed on the upper end of second housing (13-1), adds
Heat engine (13-6) is fixed on second housing (13-1) bottom, and the second asbestos washer (13-5) is fixed on heater (13-6) and constant temperature
Between sink (13-3), it is internal that the second support platform (13-4) is fixed on Water Tank with Temp.-controlled (13-3).
6. asphalt Frozen-thawed cycled processing unit according to claim 4, which is characterized in that refrigerator (4-8) wraps
The first power switch (4-8-1), the first temperature regulation switch (4-8-2) and the first display screen (4-8-3) are included, wherein, the first electricity
Source switch (4-8-1) and the first temperature regulation switch (4-8-2) are fixed on the right end of refrigerator (4-8), the first display screen (4-8-
3) it is fixed on the left end of refrigerator (4-8).
7. asphalt Frozen-thawed cycled processing unit according to claim 5, which is characterized in that heater (13-6) is wrapped
Second source switch (13-6-1), second temperature regulating switch (13-6-2) and second display screen (13-6-3) composition are included, wherein,
Second source switchs (13-6-1) and second temperature regulating switch (13-6-2) is fixed on the right end of heater (13-6), and second is aobvious
Display screen (13-6-3) is fixed on the left end of heater (13-6).
8. asphalt Frozen-thawed cycled processing unit according to claim 1, which is characterized in that under glass outer (2)
Pedestal (1) upper end is fixed at end.
9. a kind of assess the test method that performance of asphalt mixture influences under Frozen-thawed cycled, which is characterized in that based on claim 1
The asphalt Frozen-thawed cycled processing unit, includes the following steps：
Take experiment needed for certain specification test specimen 15, be divided into five groups, be denoted as the 1st group, the 2nd group, the 3rd group, the 4th group, the 5th
Group, wherein the 1st group is used as blank sample, without Frozen-thawed cycled processing.First by the soaked 2~3d of remaining four groups of test specimens, then will bubble
Test specimen after water is put into polybag, the water filling into polybag, and is tightened polybag sack with cord, by polybag (test specimen)
It lies against in insulating box to treat that further Frozen-thawed cycled is handled.
First, the first power switch (4-8-1) in refrigerator (4-8) is opened, it will by the first temperature regulation switch (4-8-2)
Temperature is set as -15 DEG C, opens simultaneously the second source switch (13-6-1) in heater (13-6), is opened by second temperature adjusting
It closes (13-6-2) and temperature is set as 40 DEG C, keep this working condition 15min, it is ensured that the first display screen (4-8- of refrigerator (4-8)
3) displays temperature is -15 DEG C, and second display screen (13-6-3) displays temperature of heater (13-6) is 40 DEG C.
Then, glass outer (2), the objective table four groups of test specimens after pretreatment being successively placed in sample storehouse (10) are opened
(11) on and glass outer (2) is closed.Controller (12) control pulley (6) slides into left end, and control along guide rail (7) at this time
Elevator (8) starts release steel strand wires (9) to sample storehouse (10) and drops in the first support platform (4-5) in household freezer (4),
Start the freezing processing to test specimen progress 2.5h.After test specimen after the freezing processing of 2.5h, controller (12) first controls elevator
(8) shrinking steel strand wires (9) makes sample storehouse (10) rise to initial position, then that pulley (6) is controlled to be slid into along guide rail (7) is most right
End finally controls elevator (8) to discharge the second support platform that steel strand wires (9) to sample storehouse (10) are dropped in water bath (13)
On (13-4), the high temperature bath for starting to carry out test specimen 1.5h at this time is handled.After test specimen completes the high temperature bath processing of 1.5h,
Controller (12) control elevator (8), which shrinks steel strand wires (9), makes sample storehouse (10) rise to initial position, then control pulley (6)
Left end is slid into along guide rail (7).So far complete a test specimen frozen-thaw process, subsequent Frozen-thawed cycled repeat more than flow
Journey until all test specimens complete scheduled Frozen-thawed cycled number of processes, finally opens glass outer (2) and takes out test specimen, close
Glass outer (2) terminates the Frozen-thawed cycled processing procedure of test specimen.Whole process is by controller (12) intelligent control simultaneously, without people
Work operates.Wherein the 2nd group of test specimen presets 5 Frozen-thawed cycled processing, and the 3rd group of test specimen presets 10 Frozen-thawed cycled processing, the 4th group of examination
Part presets 15 Frozen-thawed cycled processing, and the 5th group of test specimen presets 20 Frozen-thawed cycled processing.
Finally, the test specimen handled through pre-determined number Frozen-thawed cycled is placed in the baking oven that temperature is 25 DEG C and processing is dried,
In case subsequent performance test uses.
According to the compressive strength test regulation of asphalt, respectively to handled without Frozen-thawed cycled the 1st group of test specimen, through 5 times
2nd group of test specimen of Frozen-thawed cycled processing, the 3rd group of test specimen through 10 Frozen-thawed cycled processing, the through 15 Frozen-thawed cycled processing the 4th
Group test specimen and the 5th group of test specimen progress compressive strength test through 20 Frozen-thawed cycled processing, measure its corresponding pressure resistance respectively
It spends for RC1、RC2、RC3、RC4 and RC5.The data R measured according to experimentC1、RC2、RC3、RC4 and RC5 calculate loss of strength factor alpha
Influence of the Frozen-thawed cycled to asphalt compression strength performance is assessed, wherein, α=1-RCi/RC1 (i=2,3,4,5)；
According to the experiment on fatigue properties regulation of asphalt, respectively to handled without Frozen-thawed cycled the 1st group of test specimen, through 5 times
2nd group of test specimen of Frozen-thawed cycled processing, the 3rd group of test specimen through 10 Frozen-thawed cycled processing, the through 15 Frozen-thawed cycled processing the 4th
Group test specimen and the 5th group of test specimen progress four-point bending fatigue life test research through 20 Frozen-thawed cycled processing, test temperature are
15 DEG C, loading frequency 10Hz, using strain controlling pattern, strain level is 500 × 10-6.Fatigue criteria is material strength
Degree modulus reaches the 50% of initial stiffness modulus, and the loading number that material is undergone at this time is as experiment times of fatigue.Then through freezing
Asphalt mixture fatigue testing result is denoted as K1, K2, K3, K4 and K5 after melting cycle.According to experiment measure data K1, K2, K3,
K4 and K5 calculates influence of the antifatigue loss index β assessments Frozen-thawed cycled to Asphalt Mixtures Fatigue Properties, wherein, it is antifatigue
Loss index β=1-Ki/K1(i=2,3,4,5).
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