CN107807055A - A kind of asphalt multisequencing dynamic creep experimental data processing and analysis method - Google Patents
A kind of asphalt multisequencing dynamic creep experimental data processing and analysis method Download PDFInfo
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- CN107807055A CN107807055A CN201710918621.1A CN201710918621A CN107807055A CN 107807055 A CN107807055 A CN 107807055A CN 201710918621 A CN201710918621 A CN 201710918621A CN 107807055 A CN107807055 A CN 107807055A
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- G—PHYSICS
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- 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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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- 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
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Abstract
The invention discloses a kind of asphalt multisequencing dynamic creep experimental data processing and analysis method, LPF is carried out to the deformation of creep data that experiment measures by designing a Butterworth LPF, obtain smooth creep curve, the average permanent strain rate of each loadingsequence is calculated respectively again, then according to three indexs of formula Calculation Estimation creep property of asphalt mixture：Strain rate Sensitivity Index SRSI, compound average permanent strain rate CAPSR, compound creep stiffness modulus CCSM：SRSI is bigger, it is meant that influence of the stress state to material creep is more notable；CAPSR then represents the equivalent strain rate under Various Complex stress state, and the value is bigger, shows that caused permanent strain is bigger in once loading in material, the high-temperature behavior of material is poorer；CCSM represents the power of the permanent deformation resistance of material at the end of creep test, and the value is bigger, it was demonstrated that the high-temperature behavior of material is better.
Description
Technical field
The present invention relates to a kind of asphalt multisequencing dynamic creep experimental data processing and analysis method, belong to road
Care field.
Background technology
The dynamic creep experiment that U.S. NCHRP projects are recommended be widely used at present probe into asphalt height
The laboratory test of warm creep properties, the experiment are loaded using half-sine pulse, it is considered to be vehicle on closest to actual road surface
The action mode of load, the flow number proposed based on the experiment are the evaluation High Temperature Stability of Asphalt Mixture being widely adopted
Index.Many scholars propose the experiment of some modified versions, the multi-stage loading creep such as based on axle load spectrum on the basis of the experiment
Experiment, the experiment of uniaxial penetration dynamic creep etc., moreover, improving, flow number is still continued to use in experiment or compound rheological number comes
Evaluate the non-deformability of asphalt.
Practical experience shows, the index that flow number is not a precision height, variability is small, discrimination is good.First, flow
It is larger to become the variability of number, such as multiple parallel test specimens of identical material, the difference of flow number can be from tens to hundreds of
It is secondary, therefore, the approximate range of certain material flowing deformation number can only be obtained by carrying out multiple parallel test and then be averaging
Value, so the number of parallel test directly affects the precision of index, and is limited to experimental condition and energy, this area is most absolutely
The parallel test of number research is arrived three times two, is far from being enough for the larger index of this variability.
Secondly, the definition of flow number is more fuzzy, does not form the clear and definite computational methods of specification.Asphalt
Creep curve can be divided into three phases, and the first stage shows as strain rate and is gradually reduced, and second stage strain rate is kept substantially
It is constant, phase III strain rate rapid growth, and flow number is defined as second stage and the critical point of phase III reply
Accumulation loading number.Although three stage of the creep curve of asphalt can use power function, linear function and index respectively
Function is fitted, but the strain rate due to material during changing to next stage is gradual change and not mutated, therefore not classmate
Person proposes different criterions to how to determine critical point, for example, someone enter using the minimum point of strain rate as material it is broken
The starting point in bad stage, somebody think just to mean that material enters brokenly when strain rate increases to 1.1 times of minimum point strain rate
The bad stage.Because unified standard is not yet reached in the judgement of critical point, it result in and same group of test data is defined using different
The result of calculation of standard has more obvious deviation, so as to exacerbate the variability of this index.
In addition, the test procedure of existing dynamic creep only gathers a deformation data in each loading cycle, that is, adopt
Sample frequency is 1, can not obtain all deformed response of the test specimen when whole impulsive load loads and unloads, and can not be learnt,
This sample in which position of loading cycle, whether be fixed, these are unknown to make for post analysis processing data
Into inconvenience.So improve sample frequency, for accurately comprehensively obtain the material deformational behavior based on impulsive load be must
Want.More or less there is noise jamming, when previous sampling frequency is relatively low (1Hz), nothing in test apparatus institute gathered data
The presence of the existing high-frequency noise of body of laws, therefore, it is impossible to effectively be filtered to test data.When sample frequency increase, it is necessary to first
Noise reduction process is carried out to the data of collection, the index that could carry out next step calculates.Therefore, setting suitable low pass filter is
This method head technical problems to be solved.
Importantly, flow number can not effectively apply to instruct the maintenance management on actual road surface.This is due to stream
Become number representative is that when entrance accelerates the failure the stage material, and can not directly embody tiring out when material enters failure stage
Product deformation.And pavement maintenance management person concerns, how many rutting deformation are have accumulated on road surface at present, if reaching needs to carry out
The standard of maintenance, i.e., no matter material is in which of creep in stage, as long as rut has exceeded safety standard, during structure will face
Repair.For example, it is 10mm nowadays to repair maintenance criteria in the rut amount of Jiangsu Province's highway, i.e. pavement track reaches 10mm
When to carry out the maintenance measures such as milling or cover.Rut is road surfaces cross section sunken inside minimum point and protuberance peak
The difference of deflection, according to having studied, the deflection of depression and bump pad is close to 1:1, i.e., when reach repair standard in rut when, road
The flow deformation of face recess for the bitumen layer of 180mm thickness, is approximately equal to 2.8 ten thousand microstrains in 5mm or so.Greatly
Indoor dynamic creep test data is measured to show, when test specimen, which initially enters, accelerates the failure the stage, the corresponding permanent microstrain of accumulation
Substantially 5~100,000, both contrast it can be found that road surface will be apparently higher than tiring out corresponding to flow number to the standard of repairing in rut
Product deformation, in other words, the bitumen layer in actual pavement structure also fail to enter accelerate the failure the stage to have faced it is necessary
Middle mastery shield, therefore, obtains the flow number of material, for instructing to have little significance for actual maintenance of surface.
In dynamic creep experiment, generally set test specimen to reach 5~100,000 accumulation microstrains or accumulate loading number and reach
Stop to being tested at 10000 times.In the single shaft dynamic creep experiment without confined pressure, axial stress 0.7MPa, flow number is usual
At tens to hundreds of times, but as the increase of confined pressure, flow number also substantially increase.Tried in three axles or injection dynamic creep
In testing, some materials cause material during loading 10000 times not occur substantially destroying yet in the strain rate very little of second stage, because
And flow number can not be obtained, the quality for the high-temperature behavior of different materials of also just having no way of contrasting.Moreover, the loading meaning of 10000 times
Taste a test period close to 3 hours, and test efficiency is relatively low.
In summary, flow number solves this when evaluating the high-temperature behavior of asphalt there is a variety of disadvantages
A kind of method of problem is, using material creep second stage strain rate come the quality of judgement material non-deformability, this
It is because the strain rate of second stage is held essentially constant, and the accumulated deformation of its size and material has direct positive correlation, and easily
Calculate, error is smaller, and accuracy is high.But because traditional dynamic creep is tested in once testing often only with single lotus
Action mode is carried, i.e., once experiment can only obtain the strain rate under a kind of loaded condition, as obtained under a variety of force-bearing situations
Strain rate, then need to carry out test of many times, this considerably increases the difficulty that workload and later data are handled.Therefore, develop
The local dynamic station creep test of multisequencing loading can be carried out, can facilitate, clearly contrast the strain rate under different loaded conditions
Change, analyze the sensitivity to a certain condition, and calculate the composite strain rate under a variety of situations, compound creep stiffness mould
Amount etc., this method can be with the non-deformabilities of more scientific efficient evaluation asphalt.
The content of the invention
Technical problem：The purpose of the present invention is to propose to a kind of asphalt multisequencing dynamic creep experimental data processing and
Analysis method, the analysis indexes proposed based on this method are easy to calculating, precision high, can more comprehensively, effectively reflect complicated answer
The croop property of asphalt under power situation.
Technical scheme：The invention provides a kind of asphalt multisequencing dynamic creep experimental data processing and analysis side
Method, this method comprise the following steps：
1) Butterworth LPF parameter is set, removes the noise jamming in bitumen mixture specimen creep data,
Gentle creep curve is obtained, the curve is divided into primary creep behavior and creep second stage；
2) first and last sampled point of the test specimen within by each half-sine pulse load action cycle are extracted
Deformation data, permanent strain rate Δ ε of the asphalt within each load-bearing cycle is then calculated according to following formula：
In formula：Δ ε --- the permanent strain rate of test specimen in the single load-bearing cycle；
dl--- the accumulated deformation value of last sampled point, unit in the single load-bearing cycle：mm；
df--- the accumulated deformation value of first sampled point, unit in the single load-bearing cycle：mm；
The height of h --- test specimen, unit：mm；
T --- the duration in individual pulse load cycle, unit:s；
3) each loadingsequence includes the half-sine pulse loading cycle of multiple repetitions, and each loading sequence is calculated according to following formula
The average permanent strain rate of row
In formula：I --- i-th of loadingsequence；
--- the average permanent strain rate in i-th of loadingsequence, unit：με/s；
Δεj--- the permanent strain rate in i-th of loadingsequence in jth time loading cycle, unit：με/s；
Ni--- the repetition loading number in half-sine pulse cycle in i-th of loadingsequence；
4) the average permanent strain rate of each loadingsequence calculated according to previous step, Calculation Estimation asphalt are anti-forever
Three indexs of long deformability, it is respectively：It is strain rate Sensitivity Index SRSI, compound average permanent strain rate CAPSR, compound compacted
Become stiffness modulus CCSM；
1. strain rate Sensitivity Index SRSI is calculated according to the following formula：
In formula：I --- i-th of loadingsequence；
SRSIi--- the strain rate Sensitivity Index of i-th of loadingsequence；
--- the superposition sum of the average permanent strain rate of all loadingsequences, unit：με/
N --- the total number of creep test loadingsequence；
2. compound average permanent strain rate CAPSR is calculated according to the following formula：
In formula：--- compound average permanent strain rate, unit：με/s；
Ni--- the repetition loading number in half-sine pulse cycle in i-th of loadingsequence；
N --- the total number of creep test loadingsequence；
N ' --- the half-sine pulse cycle repeats the total degree of loading in all loadingsequences of creep second stage；
3. compound creep stiffness modulus CCSM calculates according to following formula：
In formula：--- the equivalent stress that test specimen is subject to, unit：MPa；
σi--- the stress rank of i-th of loadingsequence, unit：MPa；
N --- all loadingsequences repeat loading number altogether；
Δεp--- the permanent strain that test specimen is accumulated during off-test；
N --- the total number of creep test loadingsequence；
Sc--- the compound creep stiffness modulus of test specimen, unit：MPa.
Wherein：
Butterworth LPF parameter setting described in step 1) is respectively：Exponent number is 2~4, and cut-off frequency is
10~30Hz.
Primary creep behavior described in step 1) migrates phase, the sample under only being acted on comprising 1 preloading sequence for creep
Deformation data；Described creep second stage is creep stationary phase, the sample deformation data under being acted on comprising multiple loadingsequences.
The number of loadingsequence is configured or adjusted according to experiment demand in described creep stationary phase.
In creep second stage described in step 1), the stress range of each loadingsequence 0.3~1.4MPa it
Between, pulse width is between 0.1~0.5s, and the intermittent time is between 0~10s.
Sample frequency in step 2) in each half-sine pulse load action cycle is 200~1000Hz.
Beneficial effect：Compared with prior art, the present invention has the advantage that：
The analysis indexes of proposition are easy to calculating, precision high, can more comprehensively, effectively reflect pitch under complex stress situation
The croop property of compound：
Creep curve is divided into two stages, and the first stage is preloading phase, it is therefore an objective to reaches the permanent strain rate of test specimen
To stabilization；Second stage is multisequencing load phase, covers axle all on actual road surface and carries rank, and different speeds pair
The influence of creep, finally, the three norms for the evaluation asphalt non-deformability being calculated：Strain rate Sensitivity Index
SRSI, compound average permanent strain rate CAPSR, compound creep stiffness modulus CCSM, more conventional index more comprehensively, intuitively reflect
The creeping property of material under complex stress situation.
In addition, These parameters calculation formula is clear and definite, accuracy is high, variability is small, it is flat under obtained every kind of force-bearing situation
Equal permanent strain rate is applicable not only to the compound average permanent strain rate of laboratory test test specimen, the meter of compound creep stiffness modulus
Calculate, moreover it is possible to based on the actual axle load spectrum data in road surface, calculate the compound average permanent strain rate on true road surface and compound creep strength
Spend modulus.
In summary, this analysis method can make to have set up between indoor experimental data and actual maintenance of surface data
Effect contact, facilitates two kinds of data and mutually compares confirmation, so that indoor experimental data preferably instructs pavement maintenance management reality
Trample, help the rut development to bituminous paving of pavement maintenance management unit more convenient and quicker effectively to be estimated.
Brief description of the drawings
Fig. 1 is creep comparison diagram of the asphalt within the load action cycle twice before and after filtering；
Fig. 2 is permanent strain rate corresponding to each loading in average the permanent strain rate and the sequence of the 4th loadingsequence
With the change of loading number；
Fig. 3 is the strain rate Sensitivity Index distribution map of all loadingsequences；
Fig. 4 is the average permanent strain rate of all loadingsequences of second stage and the compound average permanent strain rate of material.
Embodiment
By taking the result of the test of AC-20 type 70# asphalts as an example, the present invention is done with reference to the drawings and specific embodiments
Further illustrate.
The inventive method comprises the following steps：
1) Butterworth (Butterworth) low pass filter parameter is designed, the noise removed in test specimen creep data is done
Disturb, obtain the determination method of gentle creep curve, wherein exponent number and cut-off frequency：The value model of each parameter is determined first
Enclose, different combinations is then carried out in span to two parameters, contrasts the filter effect under every kind of combination, it is final to determine
Optimum combination.
As shown in figure 1, the figure shows (stress intensity in the 4th loadingsequence in multisequencing local dynamic station creep test
0.7MPa, pulse width 0.4s, intermittent time 0.6s) in the first two loading cycle before and after (common 2s, 1000 data points) filtering
Accumulated deformation data comparison.Sample frequency is arranged to 500Hz in this example, and therefore, the data point collected in 1s is 500,
Adjacent 2 points of sampling interval is 2ms.It can be clearly seen that, the unfiltered data that solid line is shown have more ripple from figure
Dynamic, i.e., so-called noise jamming, the presence of noise will affect greatly to the accuracy that strain rate calculates, it is necessary to first logarithm
According to progress noise reduction process.
From Butterworth low pass filters, by repeatedly attempting, it is found that when setting exponent number be that 3, cut-off frequency is set to
Filter effect during 20Hz is optimal.Intermittent line in figure eliminates noise substantially, and more smoothly, and two curves more paste
Close, intermittent line is fluctuated generally within solid line near the intermediate value of data, illustrates that filtering is more successful, filtered data can embody
Go out the correct deformation behaviour of test specimen.It should be noted that the setting of cut-off frequency and the sample frequency tested are closely related.This example
20Hz cut-off frequency is set, depending on being the sample frequency based on 500Hz in experiment, if the sample frequency in experiment have it is larger
Change, then the cut-off frequency for needing to adjust wave filter is so as to reaching satisfied filter effect.
2) first and last sampled point of the test specimen within by each half-sine pulse load action cycle are extracted
Deformation data, permanent strain rate Δ ε of the asphalt within each load-bearing cycle is then calculated according to following formula：
In formula：Δ ε --- the permanent strain rate of test specimen in the single load-bearing cycle；
dl--- the accumulated deformation value of last sampled point, unit in the single load-bearing cycle：mm；
df--- the accumulated deformation value of first sampled point, unit in the single load-bearing cycle：mm；
The height of h --- test specimen, unit：mm；
T --- the duration in individual pulse load cycle, unit:s；
Because the cycle loaded in this example once is 1s, sample frequency 500Hz, height of specimen 150mm, therefore, public affairs
Formula is rewritable to beBy taking loadingsequence four as an example, the permanent strain rate for each loading being calculated is as schemed
Shown in 2, permanent strain rate is larger initial stage in loading, is gradually reduced and tends towards stability with the increase of loading number.
3) each loadingsequence includes the half-sine pulse loading cycle of multiple repetitions, and each loading sequence is calculated according to following formula
The average permanent strain rate of row
In formula：I --- i-th of loadingsequence；
--- the average permanent strain rate in i-th of loadingsequence, unit：με/s；
Δεj--- the permanent strain rate in i-th of loadingsequence in jth time loading cycle, unit：με/s；
Ni--- the repetition loading number in half-sine pulse cycle in i-th of loadingsequence；
In this example, the repetition loading number of remaining each sequence is 50 in addition to preloading sequence, after repeated loading
Strain rate is averaged obtained average permanent strain rate, then the value can represent the average mechanics of the material under this force-bearing situation
Response.The average permanent strain rate of all loadingsequences of creep second stage is illustrated in Fig. 4.
4) the average permanent strain rate of each loadingsequence calculated according to previous step, Calculation Estimation asphalt are anti-forever
Three indexs of long deformability, it is respectively：It is strain rate Sensitivity Index SRSI, compound average permanent strain rate CAPSR, compound compacted
Become stiffness modulus CCSM；
1. strain rate Sensitivity Index SRSI is calculated according to the following formula：
In formula：I --- i-th of loadingsequence；
SRSIi--- the strain rate Sensitivity Index of i-th of loadingsequence；
--- the superposition sum of the average permanent strain rate of all loadingsequences, unit：με/s；
N --- the total number of creep test loadingsequence；
The index be weigh each loaded condition under average permanent strain rate account for respectively all loadingsequences averagely should
The ratio of variability sum；The value being calculated is bigger, and draw of the stress state corresponding to explanation to material is more notable.Fig. 3
Shown is the SRSI exponential distribution figures for including totally 25 loadingsequences including preloading sequence.Wherein, preloading sequence
Stress rank is 0.7MPa, pulse width 0.1s；Remaining 24 sequence be respectively eight kinds of stress ranks (0.7MPa~
1.4MPa) and three kinds of pulse widths (0.1s~0.4s) combination, the loading sequence post from left to right to that indicated in the drawings of experiment
The arrangement of shape figure is consistent.It is clear that from Fig. 3 when stress rank and pulse width are proportionate with permanent strain rate,
And influence of the superposition of the two to strain rate is more notable.Although it is noted that stress shape suffered by preloading sequence
Condition and sequence 2 are consistent, but strain rate Sensitivity Index is close with sequence 18 (1.2MPa_0.2s), illustrate primary creep behavior (or
The densification stage of material) to material permanent deformation influence it is more notable, this is similar to the Accumulation of rut on actual road surface,
The development speed of rut is very fast after being just open to traffic.
2. compound average permanent strain rate CAPSR is calculated according to the following formula：
In formula：--- compound average permanent strain rate, unit：με/s；
Ni--- the repetition loading number in half-sine pulse cycle in i-th of loadingsequence；
N ' --- the half-sine pulse cycle repeats the total degree of loading in all loadingsequences of creep second stage；
N --- the total number of creep test loadingsequence；
Average permanent strain rate under every kind of force-bearing situation is overlapped by the step according to loading number accounting, obtains one
The individual CAPSR for representing a variety of force-bearing situations, the value is smaller, then means that the high-temperature behavior of material is better.This formula is not only fitted
For laboratory test, actual road surface can also be extended to and used, willIt is changed on actual road surface axle load spectrum accounting just
Can, it thus can easily contrast the difference of the high-temperature behavior on different axle load spectrum road surfaces.For convenience of for example, still adopting here
Analyzed with the data of laboratory test, the CAPSR being calculated is as shown in the signified horizontal line of arrow in Fig. 4.
3. compound creep stiffness modulus CCSM calculates according to following formula：
In formula：--- the equivalent stress that test specimen is subject to, unit：MPa；
σi--- the stress rank of i-th of loadingsequence, unit：MPa；
N --- all loadingsequences repeat loading number altogether；
Δεp--- the permanent strain that test specimen is accumulated during off-test；
N --- the total number of creep test loadingsequence；
Sc--- the compound creep stiffness modulus of test specimen, unit：MPa.
Compared with CAPSR, CCSM introduces the influence of axial stress and primary creep behavior, represents material and is tried in creep
The power of the permanent deformation resistance of material at the end of testing, the value are bigger, it was demonstrated that the high-temperature behavior of material is better.With CAPSR phases
Instead, CCSM means that more greatly the non-deformability of material is better.
In this example, test specimen half-sine pulse load repeat function number in the preloading sequence of primary creep behavior is
400, therefore, the equivalent stress being calculated is 0.9625MPa；Height of specimen 150mm, the accumulation of test specimen is permanent during off-test
5.2mm is deformed into, accumulation permanent strain is 3.47%；It is 27.7MPa to bring above formula into and obtain the CCSM of the material.
Claims (5)
1. a kind of asphalt multisequencing dynamic creep experimental data processing and analysis method, it is characterised in that：This method bag
Include following steps：
1) Butterworth LPF parameter is set, the noise jamming in bitumen mixture specimen creep data is removed, obtains
Gentle creep curve, the curve are divided into primary creep behavior and creep second stage；
2) becoming for first and last sampled point of the test specimen within by each half-sine pulse load action cycle is extracted
Graphic data, permanent strain rate Δ ε of the asphalt within each load-bearing cycle is then calculated according to following formula：
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In formula：Δ ε --- the permanent strain rate of test specimen in the single load-bearing cycle；
dl--- the accumulated deformation value of last sampled point, unit in the single load-bearing cycle：mm；
df--- the accumulated deformation value of first sampled point, unit in the single load-bearing cycle：mm；
The height of h --- test specimen, unit：mm；
T --- the duration in individual pulse load cycle, unit:s；
3) each loadingsequence includes the half-sine pulse loading cycle of multiple repetitions, and each loadingsequence is calculated according to following formula
Average permanent strain rate
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Δεj--- the permanent strain rate in i-th of loadingsequence in jth time loading cycle, unit：με/s；
Ni--- the repetition loading number in half-sine pulse cycle in i-th of loadingsequence；
4) the average permanent strain rate of each loadingsequence calculated according to previous step, the anti-permanent change of Calculation Estimation asphalt
Three indexs of shape ability, it is respectively：Strain rate Sensitivity Index SRSI, compound average permanent strain rate CAPSR, compound creep strength
Spend modulus CCSM；
1. strain rate Sensitivity Index SRSI is calculated according to the following formula：
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In formula：I --- i-th of loadingsequence；
SRSIi--- the strain rate Sensitivity Index of i-th of loadingsequence；
--- the superposition sum of the average permanent strain rate of all loadingsequences, unit：με/s；
N --- the total number of creep test loadingsequence；
2. compound average permanent strain rate CAPSR is calculated according to the following formula：
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In formula：--- compound average permanent strain rate, unit：με/s；
Ni--- the repetition loading number in half-sine pulse cycle in i-th of loadingsequence；
N --- the total number of creep test loadingsequence；
N ' --- the half-sine pulse cycle repeats the total degree of loading in all loadingsequences of creep second stage；
3. compound creep stiffness modulus CCSM calculates according to following formula：
<mrow>
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<mi>&sigma;</mi>
<mo>&OverBar;</mo>
</mover>
<mo>=</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>n</mi>
</munderover>
<mrow>
<mo>(</mo>
<mfrac>
<msub>
<mi>N</mi>
<mi>i</mi>
</msub>
<mi>N</mi>
</mfrac>
<mo>&times;</mo>
<msub>
<mi>&sigma;</mi>
<mi>i</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msub>
<mi>S</mi>
<mi>c</mi>
</msub>
<mo>=</mo>
<mfrac>
<mover>
<mi>&sigma;</mi>
<mo>&OverBar;</mo>
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<mrow>
<msub>
<mi>&Delta;&epsiv;</mi>
<mi>p</mi>
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</mrow>
</mfrac>
</mrow>
In formula：--- the equivalent stress that test specimen is subject to, unit：MPa；
σi--- the stress rank of i-th of loadingsequence, unit：MPa；
N --- all loadingsequences repeat loading number altogether；
Δεp--- the permanent strain that test specimen is accumulated during off-test；
N --- the total number of creep test loadingsequence；
Sc--- the compound creep stiffness modulus of test specimen, unit：MPa.
2. a kind of asphalt multisequencing dynamic creep experimental data processing according to claim 1 and analysis method,
It is characterized in that：Butterworth LPF parameter setting described in step 1) is respectively：Exponent number is 2~4, cut-off frequency
For 10~30Hz.
3. a kind of asphalt multisequencing dynamic creep experimental data processing according to claim 1 and analysis method,
It is characterized in that：Primary creep behavior described in step 1) migrates phase, the examination under only being acted on comprising 1 preloading sequence for creep
Sample deformation data；Described creep second stage is creep stationary phase, the sample deformation number under being acted on comprising multiple loadingsequences
According to.
4. a kind of asphalt multisequencing dynamic creep experimental data processing according to claim 1 and analysis method,
It is characterized in that：In creep second stage described in step 1), the stress range of each loadingsequence is in 0.3~1.4MPa
Between, pulse width is between 0.1~0.5s, and the intermittent time is between 0~10s.
5. a kind of asphalt multisequencing dynamic creep experimental data processing according to claim 1 and analysis method,
It is characterized in that：Sample frequency in step 2) in each half-sine pulse load action cycle is 200~1000Hz.
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| CN112700100A (en) * | 2020-12-24 | 2021-04-23 | 江苏中路工程技术研究院有限公司 | Method for determining rut maintenance strategy of asphalt pavement |
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