CN102109442B - Fast test method of shearing resistance of bituminous mixture - Google Patents
Fast test method of shearing resistance of bituminous mixture Download PDFInfo
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- CN102109442B CN102109442B CN2010105989784A CN201010598978A CN102109442B CN 102109442 B CN102109442 B CN 102109442B CN 2010105989784 A CN2010105989784 A CN 2010105989784A CN 201010598978 A CN201010598978 A CN 201010598978A CN 102109442 B CN102109442 B CN 102109442B
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Abstract
The invention discloses a fast test method of the shearing resistance of an bituminous mixture, and provides a new method for testing the shearing performance of a bituminous mixture which bears torsional shearing in the horizontal direction and constant pressure stress in the vertical direction on the basis of borrowing the conventional shearing performance test theory and according to the practical significance of coulomb law and shearing strength. The method provided by the invention not only is applicable to the bituminous mixture newly stirred in a laboratory, but also can be used for estimating the shearing resistance of the bituminous mixture in an actual road surface; and by utilizing the fast test method, not only can the shearing resistance of the bituminous mixture be tested, but also the cohesion and an internal friction angle which play a role in determining the shearing strength of the bituminous mixture can be obtained, so that the content of the shearing damage of the bituminous mixture can be deeply understood and accurately mastered conveniently, and a test analyzing means is provided for the optimum design of the bituminous mixture based on the shearing resistance.
Description
Technical field
The invention belongs to the applied technical field of asphalt Mechanics Performance Testing, be specifically related to a kind of method for rapidly testing of asphalt anti-shear performance.
Background technology
Bituminous concrete pavement has obtained very using widely in China because of the advantage such as comfortable, easy to maintenance of driving a vehicle.Asphalt is as the main build material of bituminous pavement top, and its mechanical property affects the serviceable life of pavement structure and the driving safety of vehicle to a great extent.Therefore in order to improve the making quality of bituminous pavement, the asphalt pavement performance is tested accurately and estimated, and the optimal design of carrying out asphalt on this basis has important practical significance.
At present, most of mechanical property of asphalt has all obtained corresponding evaluation in its design process, be specially: the fatigue behaviour that adopts the torture test test mixing material in the laboratory; Use various wheel tracking tests to estimate the anti-rut performance of compound; Cracking resistance in conjunction with diametral compression test or freeze thawing diametral compression test reflection compound.Yet, anti-shearing as the important mechanical property of asphalt, but often out in the cold in Asphalt Mixture Design and performance evaluation process.
Trace it to its cause; Mainly be that present asphalt anti-shear performance is tested equipment loaded down with trivial details, need be large-scale; Still for forming unified method of testing and standard, be embodied in: (1) as shearing test method the most commonly used, triaxial test needs large-scale, the professional testing apparatus of MTS, UTM and so on; And testing procedure is complicated, and the user of service is had relatively high expectations; (2) the coaxial shearing test apparatus of research institution such as Tongji University, Chang An University invention in recent years and traditional torsional shear appearance can only simply be tested shear strength of asphalt mixture, can not estimate the asphalt cohesive strength that constitutes shear resistance and angle of internal friction etc.; (3) though the method that Tongji University adopts injection shearing test appearance to combine with uniaxial compression test can be confirmed asphalt cohesive strength and angle of internal friction, and test relates to two tests, test procedure is various; In addition, because the object of penetration test and uniaxial compression test is not same test specimen, therefore must cause result of calculation not accurate enough.
Visible by above-mentioned introduction; Present asphalt shear behavior method of testing more or less all exists deficiency; Especially various method of testings all can not simply and accurately be tested cohesive strength and the angle of internal friction that obtains asphalt; And above-mentioned two indexs key of Evaluation of asphalt mixture shear behavior comprehensively and accurately just also is the basis of carrying out based on the asphalt optimal design of anti-shear performance.Therefore, designing the quick Validity Test method of a kind of asphalt shear-stable is of great practical significance for improving the performance of asphalt mixture appraisement system.
Summary of the invention
Technical matters:The objective of the invention is to deficiency, a kind of method for rapidly testing of asphalt anti-shear performance is provided to prior art.
Technical scheme:The method for rapidly testing of asphalt anti-shear performance of the present invention; Be to use for reference existing torsional shear on the basis of asphalt field success use experience; According to the practical significance of Coulomb law and shear resistance, proposed horizontal direction and born the asphalt mixture shearing performance test new method that torsional shear, vertical direction are born constant compressive stress.
The method for rapidly testing of asphalt anti-shear performance of the present invention comprises the steps:
1). the marshal piece of indoor moulding asphalt, and marshal piece is carried out the cutting of different length according to the maximum particle diameter of gathering materials of compound, obtain asphalt right cylinder test specimen;
2). adopt high strength glue or epoxy resin, the top of right cylinder test specimen and bottom and two tight, secure bond of steel module.After treating glue or resin bone dry, the environmental cabinet of putting into test specimen and steel module target temperature is incubated 2 ~ 4 hours; In environmental cabinet, take out test specimen and steel module, fixing on novel torsional shear appearance;
3). when only needing the shearing strength of test asphalt, the suitable speed of reversing is set directly, carries out the compound torsion shear test, obtain the curve of shear stress and torsional deflection, and obtain the shearing strength of asphalt;
4). when the cohesive strength of needs tests asphalt and angle of internal friction; Select two different counterweight weight
and
to put on the normal normal direction of tangential; Make bitumen mixture specimen receive the effect of vertical compressive stress
and
; And under identical test condition, carry out shearing test respectively; Obtain corresponding shearing strength
and
, and combine
and
to find the solution to draw cohesive strength
and angle of internal friction
.
The asphalt right cylinder sample dimensions of said step 1) is: when the nominal maximum gauge that gathers materials in the compound during greater than 19mm, it is the right cylinder of 50mm that marshal piece needs sawing to become thickness; When the nominal maximum gauge that gathers materials during greater than 12.5mm, the height of compound right cylinder test specimen is 40mm.
The suitable speed of reversing of said step 3) should not be excessive, and general recommendations speed is 0.05 commentaries on classics/min.
Beneficial effect:The present invention is a shear strength of asphalt mixture; Especially the method for quick of cohesive strength and angle of internal friction; Also be the anti-shear performance of Evaluation of asphalt mixture, and carry out the important means of compound optimal design in view of the above that invention has remarkable advantages in following several respects.
(1) the present invention not only can test the shearing strength of asphalt, can also be through changing the compressive stress vertical in the test process with shear direction, and test constitutes the most important mechanical index of asphalt shear behavior: cohesive strength and angle of internal friction.
(2) bitumen mixture specimen that the present invention relates to is traditional marshal piece, need not the gyratory compaction moulding and the moulding of repeatedly holing, and test process is convenient, succinct.
(3) the present invention is not only applicable to newly mix the shearing performance test of asphalt, can also be through the method for boring and coring, and the anti-shear performance of the original asphalt in research road surface.
Description of drawings
The test philosophy figure of Fig. 1 asphalt torsional shear during for no vertical compressive stress.
Fig. 2 is the test philosophy figure of asphalt torsional shear when vertical compressive stress is arranged.
Fig. 3 is asphalt torsion shear test curve during for no vertical compressive stress.
Have among the figure: the 1-twisted connecting rod; 2-top steel module; 3-asphalt right cylinder test specimen; 4-bottom steel control module; 5-reverses loading direction; The 6-counterweight.
Embodiment
The method for rapidly testing of asphalt anti-shear performance 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 anti-shear 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 moulding marshal piece; Two-sided hitting real each 75 times, the number of every group of test specimen is no less than 4, and is subsequent use after the test specimen demoulding.When testing the anti-shear performance of actual road surface medium pitch compound, adopt the method for boring and coring, directly from pavement structure, drill through test specimen, it is subsequent use to choose complete relatively test specimen.
2. the cutting of test specimen and detection
Achievement in research with reference to U.S. SHRP project; In order to guarantee shear test result's comparability; Need cut into right cylinder test specimen to the test specimen of marshal piece or boring acquisition with certain altitude; Be not less than the asphalt of 19mm for the nominal maximum gauge, the test specimen of the marshal piece sawing Cheng Houyue 50mm of preparation; For the nominal maximum gauge is the asphalt that is not less than 12.5mm, the test specimen of the marshal piece sawing Cheng Houyue 40mm of preparation.In order to guarantee the torsional shear precision of test result, need to detect with the bottom surface to whether right cylinder test specimen end face is parallel, measure the height of right cylinder test specimens with vernier caliper in 4 directions of cross symmetry, like the both sides difference in height during greater than 2mm, this test specimen calcellation.
2, the installation of test specimen and health
Be chosen in the high strength glue or the epoxy resin that do not deform under the environment that is lower than 60 ℃; And smear high strength glue or epoxy resin respectively at the upper and lower surfaces of right cylinder test specimen; And be placed in the right cylinder test specimen in the steel module, the compacting test specimen was treated glue or resin bone dry after 5 minutes gently; After test specimen and the steel module secure bond, reject the outer unnecessary epoxy resin of right cylinder.Measure the cylindrical height that compound test specimen and steel module are formed with vernier caliper in 4 directions of cross symmetry, like the both sides difference in height during greater than 2mm, this test specimen calcellation.With the steel module, put into the environmental cabinet of uniform temperature, take out subsequent use after 2～4 hours through insulation to qualified test specimen.
3, the test of the shear behavior of test specimen
Be placed in test specimen that from environmental cabinet, takes out and steel module immediately in the asphalt mixture shearing tester together, test specimen bottom module is fixed on the anchor clamps; The loading connecting rod of adjustment tester; Make its just with the upper steel control module inner card cage pig of test specimen, and place the counterweight of weight for
(concrete quality is done corresponding adjustment according to the difference that studies a question) on the upper steel control module.Be provided with torsion shear test speed (being generally 0.05 changes/min), start the motor of tester, make to load connecting rod and do unidirectional rotation, be that the former heart is made torsional shear to the right cylinder bitumen mixture specimen thereby drive the upper steel control module with its center.In test process; The shearing test appearance can collect moment of torsion through torsion torque sensor, and obtains the peak torque
(
) in the shear failure process.
4, the calculating of shear strength of asphalt mixture, cohesive strength and angle of internal friction
According to formula (1) can be easily obtained from the determination of cylindrical specimens of asphalt mixture center distance is
point the shear strength
.
Wherein,
is the peak torque (
) that bitumen mixture specimen receives the test machine in the shear history and collects;
is the polar moment of inertia of right cylinder test specimen, can calculate according to formula (2) for the right cylinder test specimen that diameter is
.
Therefore, for the marshal piece of routine, the intensity during its shear failure is
Because Coulomb's law is satisfied in the shearing of asphalt, promptly when the normal stress variation range was little, the relation of shearing strength and normal stress was approximately straight line.Therefore, if will calculate the cohesive strength and the angle of internal friction of asphalt, then need carry out having for twice the shear test of different vertical compressive stress.Be reflected in the experimentation; As long as change the counterweight weight
(
) that in the shear test process right cylinder test specimen is applied, and find the solution formula (3) and formula (4) system of equations can obtain cohesive strength
and angle of internal friction
.
(3)
Wherein,
,
are respectively the compound shearing strengths that twice shear test block obtains;
;
is respectively the vertical compressive stress that in twice process of the test the compound test specimen is applied, and they can be according to computes.
Below in conjunction with accompanying drawing, through embodiment technical scheme of the present invention is elaborated, but protection scope of the present invention is not limited to said embodiment.
Embodiment:A kind of method for rapidly testing of asphalt anti-shear performance comprises the steps:
(1) preparation of bitumen mixture specimen
The grating and the bitumen aggregate ratio of the asphalt of estimating as required, three groups of moulding totally 12 marshal pieces in the laboratory, the voidage of test specimen is controlled according to the design voidage.Marshal piece after the moulding cuts, polishes processing, is specially: be not less than the asphalt of 19mm for the nominal maximum gauge, the test specimen of the marshal piece sawing Cheng Houyue 50mm of preparation; For the nominal maximum gauge is the asphalt that is not less than 12.5mm, the test specimen of the marshal piece sawing Cheng Houyue 40mm of preparation.The right cylinder test specimen that obtains after the cutting in placing normal temperature air, until the test specimen dry tack free.
(2) preparation before the shear test
Top and bottom at the right cylinder test specimen are smeared high strength glue uniformly; And two steel modules of getting novel shearing test appearance; Bonding with the top and bottom of test specimen respectively; And keep test specimen vertically to be positioned on level ground or the worktable at least 5 minutes, until test specimen and complete, the firm bonding of steel module.Scrape off with blade, expose after the outside surplus glue of right cylinder test specimen subsequent use.
(3) shear test
When the anti-shear performance of 45 ℃ of needs tests 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 sweat box together.Be incubated and from the environment temperature case, take out test specimen and module after 2～4 hours immediately, and be placed on the tester.Then, set the speed of torsional shear, respectively one group of 4 test specimen is not had the horizontal torsion shearing test of vertical stress, the torsional shear curve of this asphalt is as shown in Figure 2 when obtaining 45 ℃, and obtains its shearing strength thus.When the cohesive strength of needs tests asphalt and angle of internal friction; Setting puts on test specimen vertical direction counterweight weight
and
; And test and obtain shearing strength
and
under the different counterweight weight respectively, bring test findings into formula (3) and formula (4) can calculate cohesive strength
and angle of internal friction
.
Claims (3)
1. the method for rapidly testing of an asphalt anti-shear performance is characterized in that comprising the steps:
1). the marshal piece of indoor moulding asphalt, and marshal piece is carried out the cutting of different length according to the maximum particle diameter of gathering materials of compound, obtain asphalt right cylinder test specimen;
2). adopt high strength glue or epoxy resin, the top of asphalt right cylinder test specimen and bottom and two tight, secure bond of steel module; After treating glue or resin bone dry, the environmental cabinet of putting into asphalt right cylinder test specimen and steel module target temperature is incubated 2 ~ 4 hours; In environmental cabinet, take out asphalt right cylinder test specimen and steel module, fixing on novel torsional shear appearance;
3). when only needing the shearing strength of test asphalt, the suitable speed of reversing is set directly, carries out the compound torsion shear test, obtain the curve of shear stress and torsional deflection, and obtain the shearing strength of asphalt;
4). when the cohesive strength of needs tests asphalt and angle of internal friction; Select two different counterweight weight
and
to put on the normal direction of tangential; Make asphalt right cylinder test specimen receive the effect of vertical compressive stress
and
; And under identical test condition, carry out shearing test respectively; Obtain corresponding shearing strength
and
, and combine
and
to find the solution to draw cohesive strength
and angle of internal friction
.
2. the method for rapidly testing of asphalt anti-shear performance as claimed in claim 1; It is characterized in that; The asphalt right cylinder sample dimensions of said step 1) is: when the nominal maximum gauge that gathers materials in the compound during greater than 19mm, it is the right cylinder of 50mm that marshal piece needs sawing to become thickness; When the nominal maximum gauge that gathers materials less than 19mm, during greater than 12.5mm, the height of asphalt right cylinder test specimen is 40mm.
3. the method for rapidly testing of asphalt anti-shear performance as claimed in claim 1 is characterized in that, the suitable speed of reversing of said step 3) is 0.05 commentaries on classics/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105989784A CN102109442B (en) | 2010-12-21 | 2010-12-21 | Fast test method of shearing resistance of bituminous mixture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105989784A CN102109442B (en) | 2010-12-21 | 2010-12-21 | Fast test method of shearing resistance of bituminous mixture |
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| CN102109442A CN102109442A (en) | 2011-06-29 |
| CN102109442B true CN102109442B (en) | 2012-07-25 |
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| CN2010105989784A Expired - Fee Related CN102109442B (en) | 2010-12-21 | 2010-12-21 | Fast test method of shearing resistance of bituminous mixture |
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|---|---|---|---|---|
| CN102426221B (en) * | 2011-11-01 | 2014-01-29 | 长安大学 | Test method for predicting adhesion force between asphalt and aggregate |
| CN102692352A (en) * | 2012-06-25 | 2012-09-26 | 长安大学 | Bridge deck bonding layer torsional shearing device and detection method thereof |
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| CN103743631A (en) * | 2014-01-15 | 2014-04-23 | 长沙理工大学 | Torsional shear test method for asphalt mixture |
| CN105092393B (en) * | 2015-09-10 | 2016-04-20 | 长安大学 | The torsion proving installation that a kind of concrete shearing is crept and method of testing |
| CN106840916B (en) * | 2016-12-19 | 2020-06-09 | 长安大学 | Test device and method for testing shear strength of asphalt material |
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| CN111006955A (en) * | 2019-12-26 | 2020-04-14 | 江西省宏发路桥建筑工程有限公司 | Asphalt mixture performance testing method and system based on triaxial numerical test |
| CN111175111B (en) * | 2020-03-02 | 2022-02-01 | 湘潭大学 | Clamp for shear test of asphalt concrete contact test piece and test method thereof |
| CN111982751A (en) * | 2020-08-10 | 2020-11-24 | 清华大学 | Method for analyzing shear thickening characteristic of cement-based material |
| CN111982712A (en) * | 2020-08-19 | 2020-11-24 | 南京林业大学 | Evaluation method for self-healing performance of shape memory gutta-percha modified asphalt |
| CN114112733B (en) * | 2021-11-29 | 2023-09-15 | 中交文山高速公路建设发展有限公司 | Dynamic test method for high-speed shear strength of asphalt concrete |
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|---|---|---|---|---|
| US5670711A (en) * | 1996-03-08 | 1997-09-23 | Regents Of The University Of Minnesota | Portable rock strength evaluation device |
| CN1873391A (en) * | 2005-06-03 | 2006-12-06 | 同济大学 | Method for determining parameters of shear resistant C, Phi of asphalt mixture |
| CN101261208A (en) * | 2008-04-22 | 2008-09-10 | 东南大学 | Asphalt concrete shearing performance test method |
| JP2008281533A (en) * | 2007-05-14 | 2008-11-20 | Kansai Electric Power Co Inc:The | Base rock strength evaluating method |
| CN101788431A (en) * | 2010-02-10 | 2010-07-28 | 长沙理工大学 | Device and method for testing shear performance of asphalt mixture |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5871432A (en) * | 1981-10-23 | 1983-04-28 | Odakyu Kensetsu Kk | Soil test method |
-
2010
- 2010-12-21 CN CN2010105989784A patent/CN102109442B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5670711A (en) * | 1996-03-08 | 1997-09-23 | Regents Of The University Of Minnesota | Portable rock strength evaluation device |
| CN1873391A (en) * | 2005-06-03 | 2006-12-06 | 同济大学 | Method for determining parameters of shear resistant C, Phi of asphalt mixture |
| JP2008281533A (en) * | 2007-05-14 | 2008-11-20 | Kansai Electric Power Co Inc:The | Base rock strength evaluating method |
| CN101261208A (en) * | 2008-04-22 | 2008-09-10 | 东南大学 | Asphalt concrete shearing performance test method |
| CN101788431A (en) * | 2010-02-10 | 2010-07-28 | 长沙理工大学 | Device and method for testing shear performance of asphalt mixture |
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