CN102072840A - Method for testing shear fatigue of asphalt mixture - Google Patents
Method for testing shear fatigue of asphalt mixture Download PDFInfo
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- CN102072840A CN102072840A CN2010105977611A CN201010597761A CN102072840A CN 102072840 A CN102072840 A CN 102072840A CN 2010105977611 A CN2010105977611 A CN 2010105977611A CN 201010597761 A CN201010597761 A CN 201010597761A CN 102072840 A CN102072840 A CN 102072840A
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Abstract
The invention discloses a method for testing the shear fatigue of an asphalt mixture, and provides the method for testing the shear fatigue by applying periodically repeated load of control stress to an inner steel column through an outer steel column in a fixed coaxial shear testing device by combining loading characteristics of the conventional fatigue test of the asphalt mixture and an implementation mode of shearing of the mixture in the coaxial shear test method. The method is suitable for the asphalt mixture which is newly mixed in a laboratory and can also be used for evaluating the shear fatigue performance of the asphalt mixture in an actual pavement, so road workers can conveniently further investigate a rule for producing shear flow deformation of an asphalt pavement and a mechanism for damaging the shear fatigue of the asphalt mixture under the action of vehicle repeated load, the conventional asphalt mixture performance evaluation system is perfected, and a test analysis method can also be provided for the optimal design of the asphalt mixture based on the shear fatigue resistance performance.
Description
Technical field
The invention belongs to the applied technical field of asphalt Mechanics Performance Testing, be specifically related to a kind of method of testing of asphalt mixture shearing fatigue.
Background technology
Weather, vehicular load and environment are to the complicacy of bituminous concrete pavement effect, and characteristics such as the vehicle maximization that occurs in recent years, heavy loading, make some bituminous concrete pavement structures damage in various degree usually in design period, occur, caused the loss of a large amount of material resources and financial resources.In the various diseases of bituminous pavement, be one of more common disease pattern because of vehicular load repeats repeatedly to act on the pavement structure fatigue crack that causes.For fatigue crack is carried out effectively preventing, various countries road worker has carried out number of research projects, and thinks that the road surface fatigue crack can be divided into opening mode, shearing-type and compound three major types type usually.Wherein, opening mode crack is caused by the horizontal tension of ground surface material bearing load that mainly shearing mode crack mainly is because asphalt is subjected to repeatedly due to the shear stress, and Mixed Mode Crack is the result of horizontal tension and shear stress combined action.
On the basis that the bituminous pavement fatigue crack is classified, people recognize that also the crackle of reply different types forms the research of mechanism, and propose corresponding countermeasures based on this.At present, research for the opening mode fatigue crack is maximum, it mainly is the fatigue lifetime of adopting the torture test test asphalt in the laboratory, and proposed thus with surface layer bottom tension or the stretching strain controlling index as Fatigue Design, " asphalt highway design specifications " (JTG D50-2006) of China promptly is the pavement structure design of considering opening mode fatigue break performance with the tensile structure strength factor at present.Compare with the research of opening mode crack, because of the fatigure failure that shear action produces is often ignored by people all the time.Yet, the bituminous pavement in some zones, major trunk roads crossing, big city has produced at high temperature season and serious has gathered around bag, pushed and diseases such as rut in recent years, basically every two years will milling cover again once, new surface layer experienced after one, two summer, and it is still very serious to gather around bag, rut problem.Moreover, because shearing mode crack has in various degree also appearred in the axle for vehicle increase of carrying in recent years on some highway structures.Based on this, at present the shear failure of bituminous pavement causes that people more and more pay close attention to, the how to evaluate asphalt under load action shear behavior and repeatedly the shear fatigue performance under the reloading effect become problem demanding prompt solution.
For the anti-shear performance evaluation of asphalt under load action, the researchist has has researched and developed the test that multiple boxshear apparatus carries out shear strength of asphalt mixture at present, such as coaxial shearing test instrument, single shaft injection boxshear apparatus and torsional shear instrument or the like, can carry out rational evaluation to shear strength of asphalt mixture by the said equipment.Than the test of shearing strength, repeatedly load down cut Fatigue Properties relatively lags behind.So far, the SST(SuperPave Shear Tester that has only U.S. SHRP plan research and development) shear testing maschine can be applied to comparison with imitating and estimate the anti-shearing fatigue behaviour of asphalt.Yet this equipment price costliness is had relatively high expectations to operating personnel, is not widely used as yet in China at present.Therefore, on the basis that makes full use of the existing performance of asphalt mixture testing apparatus that comprises MTS, UTM etc., realize asphalt the repetition shear history, carry out the shear fatigue performance test and be of great practical significance.
Summary of the invention
Goal of the invention:The objective of the invention is at the deficiencies in the prior art, a kind of method of testing of asphalt mixture shearing fatigue is provided.
Technical scheme:Asphalt mixture shearing method for testing fatigue of the present invention, fatigue in conjunction with the UTM Material Testing Machine loads feature and coaxial shear test apparatus, proposed the outer steel cylinder in the fixing coaxial shearing test device, internally steel column applies the cycle reloading of proof stress to realize the method for testing of shear fatigue.
The method of testing of asphalt mixture shearing fatigue of the present invention comprises the steps:
1) the large-scale marshal piece of indoor moulding asphalt cuts into test specimen and highly is the right cylinder test specimen of 50mm, and is the center of circle with right cylinder test specimen center, gets out the right cylinder that diameter is 50mm, obtains the hollow circular cylinder test specimen of cross section for annular;
2) adopt high strength glue or epoxy resin, the right cylinder steel column outside that is applied in diameter and is 50mm is the steel bushing inboard of 150mm with internal diameter, and in test specimen is installed between steel column and the outer steel sleeve, makes test specimen and two tight, secure bond of steel module;
3) treat glue or resin bone dry after, the environmental cabinet of test specimen and steel module being put into target temperature is incubated 2 ~ 4 hours; And test specimen is placed in the UTM Material Testing Machine, fixing outer steel sleeve, internally the steel column rate of application is the load of 1mm/min, the load when obtaining asphalt mixture shearing and destroying
4) with
As tired peak value load, and set test parameterss such as load waveform, loading frequency, quiescent interval, fixing outer steel sleeve, the internal steel column shear fatigue test of carrying out 10000 secondary actions under the Stress Control pattern, acquisition
The shear fatigue curve of asphalt obtains the shear fatigue life-span thus under the load; Fatigue stress number percent
Be the numerical value between 0 ~ 100.
The shear fatigue life-span of described step 4) is the pairing number of loading of flex point of shear fatigue rotary shearing steady-state deformation stage and failure stage.
Described step 4) then increases for the situation that does not occur the 3rd failure stage of the curve of fatigue when load action for 10000 times yet
Value, obtaining the complete curve of fatigue, and obtain the shear fatigue life-span.
Beneficial effect:The present invention is the asphalt mixture shearing method of testing of fatigue lifetime, also is research mixture shearing flow deformation rule and fatigure failure mechanism, and carries out the important means of compound optimal design in view of the above, and invention has remarkable advantages in following several respects.
(1) the present invention not only can test the shearing strength of asphalt, can also test obtaining the detrusion rule of development and the shear fatigue life-span of asphalt under a certain shear stress level, thereby provide analytical approach for the pavement performance of thoroughly evaluating asphalt.
(2) the present invention has made full use of current material testing machine UTM, need not to increase extra testing equipment and can carry out shear fatigue test research, and test procedure is simple, is convenient to operating personnel and grasps.
(3) the present invention is not only applicable to newly mix the shearing performance test of asphalt, can also be by the method for boring and coring, and the shear fatigue performance of the original asphalt in research road surface.
Description of drawings
Fig. 1 is the test philosophy figure of asphalt mixture shearing torture test.
Fig. 2 is the relation curve of asphalt mixture shearing distortion with number of loading.
Wherein have: 1-loads pressure head; Steel column in the 2-; 3-asphalt ring specimen; The 4-outer steel sleeve; 5-repeats
Cyclic loading.
Embodiment
The method of testing of asphalt mixture shearing fatigue of the present invention specifically comprises the steps:
, bitumen mixture specimen preparation
1. the moulding of test specimen and preparation
When test experiments is indoor when newly mixing the shear fatigue performance of asphalt, design grating and bitumen aggregate ratio by asphalt, according to " highway engineering pitch and asphalt testing regulations " (JTJ052-2000) correlation test method forming diameter be 152.4mm, highly be the large-scale marshal piece of 95.3 ± 2.5mm, two-sided hitting real each 112 times, the number of every group of test specimen is no less than 4, and is standby after the test specimen demoulding.When testing the shear fatigue performance of actual road surface medium pitch compound, adopt the method for boring and coring, directly from pavement structure, drill through the test specimen that diameter is 150mm, it is standby to choose complete relatively test specimen.
2. the cutting of test specimen
The Guo Zhongyin of Tongji University professor thinks that the height of compound right cylinder test specimen is that 50mm is advisable when carrying out the coaxial shear test of asphalt.Shear fatigue test of the present invention need be the test specimen of the marshal piece sawing Cheng Houyue 50mm of preparation, and be circle with the center of test specimen, getting out the right cylinder that diameter is 50mm, is that 150mm, internal diameter are the intermediate void, cross section of the 50mm right cylinder bitumen mixture specimen for annular thereby obtain external diameter.
2, the installation of coaxial shear test block
Be chosen in the high strength glue or the epoxy resin that do not deform under the environment that is lower than 60 ℃, the outside surface of steel column and internal diameter are that the outer steel sleeve inside surface of 150mm is smeared high strength glue or epoxy resin uniformly in diameter is 50mm, and annular bitumen mixture specimen put into the annular space that steel column and outer steel sleeve constitute, treat glue or resin bone dry, after test specimen and the steel module secure bond, reject outer unnecessary epoxy resin or the glue of right cylinder.
3, the test of the shear fatigue performance of test specimen
1. tired control model
For traditional asphalt repeated bend test, the test control model mainly contains Stress Control and strain is controlled two kinds.Adopt the test period of Stress Control pattern shorter relatively, and usually with the fracture fully of test specimen as criterion of failure; And when adopting the strain control model, generally with the stiffness of compound drop to initial stiffness 50% as criterion of failure.Comparatively speaking, the reproduction of Stress Control mode is better, and experimental period is shorter, the fracture of off-test test specimen, the definition clear-cut of fatigure failure; Proof stress is tested required test specimen negligible amounts, and fatigue data point degree of scatter is little.In addition, the present invention proposes in conjunction with UTM Material Testing Machine and coaxial shear test apparatus, if will adopt contingency model, need additionally install servo-control system additional.Therefore, the present invention adopts the shear fatigue pattern of Stress Control.
Need to prove that control model of the present invention is the vertical load of steel column in putting on the control loaded connecting rod
(KN), obtain the shear stress that asphalt is subjected to as needs as controlled target
(MPa) can calculate according to formula (1).
(1)
Wherein,
Be the shear strength factor of compound, according to Guo Zhongyin professor's research, conventional asphalt
Value reduces along with the increase of temperature, in 20 ~ 60 ℃ scope
Be 0.14 ~ 0.12.
2. load pattern
The fatigue lifetime of material and load waveform have certain relation, it has been generally acknowledged that sinusoidal waveform relatively approaches the load waveform that bears on actual road surface, and the present invention also adopts sinusoidal wave load to carry out torture test.A large amount of calculating show, tired loading frequency 10Hz is equivalent to Vehicle Speed 60～65Km/h, the design speed scope of the expressway of " highway technical standard " regulation of China's current is 40～120Km/h, and it is suitable therefore adopting 10Hz to apply frequency as load.Certainly, be research purpose as if bituminous pavement shear fatigue with zone, major urban arterial highway crossing, can be according to the car speed of local factual survey
(Km/h), to the load frequency
(Hz) adjust, concrete grammar is:
(2)
3. test process
The test specimen of secure bond with the steel module, is put into the environmental cabinet of UTM Material Testing Machine, and it is target temperature that the environmental cabinet temperature is set.After being incubated 2～4 hours, test specimen is placed in the asphalt mixture shearing tester, outer steel sleeve is fixed on the anchor clamps; Adjust the loading connecting rod of tester, it is just contacted with the interior steel column of test specimen end face.Needs according to research, parameters such as suitable load application frequency, waveform, quiescent interval and peak value load are set on the UTM testing machine, start the motor of tester, make the loading connecting rod act on interior steel column, make shearing motion thereby drive the annular asphalt according to a constant load waveform.In test process, UTM loads connecting rod not only can control load peak value and waveform, can also gather the displacement of link motion, thereby can obtain the asphalt mixture shearing flow deformation and the relation curve in load time and cycle.
4, the criterion of failure of shear fatigue
From SST(SuperPave Shear Tester) detrusion of shear testing maschine and the relation curve in load action cycle as can be seen, the shear fatigue curve is divided into three phases: compression deformation stage, shear flow steady-state deformation stage and failure stage.According to the curve of fatigue, generally subordinate phase and the flex point between the phase III as the fatigure failure point, the number of loading of this moment is as the shear fatigue life-span.In the figure of being depicted for 5000 times according to given SST shear fatigue test action period of AASHTO, the compounds of the overwhelming majority can not show the rheological characteristics of phase III; And and research Shao Lageng quick according to what bridge still has the part asphalt flex point not occur behind load repeat function 10000 times.Therefore, in order to occur destroying flex point in the warranty test process, the shear resistance that asphalt is at first tested in the present invention suggestion selects bigger stress level to carry out shear fatigue test then, with the number of loading at the flex point place of the curve of fatigue as the shear fatigue life-span; Do not occur the situation of flex point for 10000 times yet for load action, can suitably increase the load stress level.
Below in conjunction with accompanying drawing, by embodiment technical solution of the present invention is elaborated, but protection scope of the present invention is not limited to described embodiment.
Embodiment:A kind of method of testing of asphalt mixture shearing fatigue comprises the steps:
(1) preparation of bitumen mixture specimen
The grating of the asphalt of Ping Jiaing and bitumen aggregate ratio as required, one group of moulding totally 7 large-scale marshal pieces in the laboratory, the diameter of test specimen are 152.4mm, highly are 95.3 ± 2.5mm that the voidage of test specimen is controlled according to the design voidage.The right cylinder test specimen of marshal piece sawing Cheng Houyue 50mm of preparation, and to take out diameter in the boring of the center of test specimen be the small cylinder of 50mm, and obtaining the cross section is the right cylinder test specimen of annulus, treat test specimen surface bone dry after, standby.
(2) preparation before the shear test
Adopt the mould of coaxial shearing test device as shear fatigue, be specially: at diameter is that the right cylinder steel column outside surface of 50mm and inner surface that diameter is the 150mm outer steel sleeve are smeared high strength glue respectively uniformly.And steel column is inserted into hollow part in the right cylinder test specimen, and again test specimen is put into to outer steel sleeve, make the inwall of hollow test specimen closely contact with outer steel sleeve respectively at interior steel column with outer wall.Treat glue dries, after complete, the firm bonding of steel mold and bitumen mixture specimen, with blade scrape off expose after the surplus glue of right cylinder test specimen outside standby.
(3) shear fatigue test
When needs are tested the shear fatigue performance of 45 ℃ of asphalts, the target temperature of design temperature case is 45 ℃, and the right cylinder test specimen and with it two steel modules of close adhesion put into the sweat box of UTM testing machine together, be incubated and be placed on the tester after 2～4 hours.Then, select 3 test specimens, carry out the shear test of test specimen under the subordinate load respectively, shear rate is 1mm/min, peak value load when obtaining the shear failure of each bitumen mixture specimen when the coefficient of dispersion of three measured values is in 20%, is got its mean value as shear resistance
, otherwise, increase sample quantities and test, until meeting the demands.Then, with
As tired peak value load (
Being fatigue stress number percent, is the numerical value between 0 ~ 100), and set test parameterss such as load waveform, loading frequency, quiescent interval, to other 4 shear fatigue tests that test specimen carries out 10000 secondary actions, obtain
The shear fatigue curve of asphalt obtains the shear fatigue life-span thus under the load.For reach the 3rd failure stage moral situation that does not occur the curve of fatigue for 10000 times yet when the load action cycle, can suitably increase
Value.
(4) fatigue test results and fatigue equation
Same sample parallel experiment four times when the coefficient of dispersion of four measured values is in 20%, is got its mean value as the test findings in shear fatigue life-span, otherwise, increase sample quantities and test, until meeting the demands.For the test result of fatigue lifetime, should indicate test condition, comprise test temperature, load stress level, load waveform, quiescent interval etc.
When obtaining the load stress level be
The time asphalt after fatigue lifetime, can change 4 stress levels, and obtain the fatigue lifetime under the different stress levels, and obtain tired parameter according to formula (3) match
With
（3）
Wherein,
Be the shear fatigue life-span of asphalt;
Be shear stress level;
Be the torture test parameter;
Slope for the curve of fatigue under the logarithmic coordinate.
Claims (3)
1. the method for testing of an asphalt mixture shearing fatigue is characterized in that this method comprises the steps:
1) the large-scale marshal piece of indoor moulding asphalt cuts into test specimen and highly is the right cylinder test specimen of 50mm, and is the center of circle with right cylinder test specimen center, gets out the right cylinder that diameter is 50mm, obtains the hollow circular cylinder test specimen of cross section for annular;
2) adopt high strength glue or epoxy resin, the right cylinder steel column outside that is applied in diameter and is 50mm is the steel bushing inboard of 150mm with internal diameter, and in test specimen is installed between steel column and the outer steel sleeve, makes test specimen and two tight, secure bond of steel module;
3) treat glue or resin bone dry after, the environmental cabinet of test specimen and steel module being put into target temperature is incubated 2～4 hours; And test specimen is placed in the UTM Material Testing Machine, fixing outer steel sleeve, internally the steel column rate of application is the load of 1mm/min, the load Fd when obtaining asphalt mixture shearing and destroying;
4) with n%F
dAs tired peak value load, and set test parameterss such as load waveform, loading frequency, quiescent interval, fixing outer steel sleeve, the internal steel column shear fatigue test of carrying out 10000 secondary actions under the Stress Control pattern, acquisition n%F
dThe shear fatigue curve of asphalt obtains the shear fatigue life-span thus under the load; Fatigue stress number percent n is the numerical value between 0～100.
2. the method for rapidly testing of asphalt anti-shear performance as claimed in claim 1 is characterized in that, the shear fatigue life-span of described step 4) is the pairing number of loading of flex point of shear fatigue rotary shearing steady-state deformation stage and failure stage.
3. the method for rapidly testing of asphalt anti-shear performance as claimed in claim 1, it is characterized in that, described step 4) is for the situation that does not occur the 3rd failure stage of the curve of fatigue when load action for 10000 times yet, then increase the value of n, obtaining the complete curve of fatigue, and obtain the shear fatigue life-span.
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| CN114112731A (en) * | 2021-09-03 | 2022-03-01 | 北京理工大学 | Sample suitable for dynamic compression shear mechanical property research of explosive welding material |
| CN114112731B (en) * | 2021-09-03 | 2023-10-27 | 北京理工大学 | Sample suitable for research on dynamic compression shearing mechanical properties of explosive welding materials |
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