CN104849154A - Identification method for fatigue failure of pitch under dynamic shear load effect - Google Patents
Identification method for fatigue failure of pitch under dynamic shear load effect Download PDFInfo
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- CN104849154A CN104849154A CN201510234015.9A CN201510234015A CN104849154A CN 104849154 A CN104849154 A CN 104849154A CN 201510234015 A CN201510234015 A CN 201510234015A CN 104849154 A CN104849154 A CN 104849154A
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Abstract
An identification method for fatigue failure of pitch under a dynamic shear load effect relates to an experimental method for testing the fatigue property of road pitch by applying a dynamic shear rheometer. The identification method solves the problem of discrimination of the critical point of fatigue failure in the current pitch accelerated fatigue test, improves the scientific validity of data analyses process of the test. The identification method comprises the steps: carrying out analyses on data of the pitch accelerated fatigue test under virtual strain coordinates, carrying out quantitive analyses on generation and accumulation of fatigue damage by computing virtual strain energy stored in a material in the experiment process, and finally suggesting a criterion for taking the peak point of the stored virtual strain energy as the critical point of fatigue failure of pitch.
Description
Technical field
The invention belongs to building material field, it relates to a kind of recognition methods that fatigue failure occurs road asphalt under dynamic shearing load action that judges.
Background technology
Can there is fatigue crack due to the repeated action of wheel load of driving a vehicle in bituminous pavement, the fatigue crack on road surface drastically influence the comfortable and safe of road travel.The quality of pitch anti-fatigue performance has important contribution for the ability in bituminous pavement resisting fatigue crack, therefore needs science, effectively evaluates the anti-fatigue performance of different pitches material and distinguish.The linear amplitude scan test (i.e. linear strain scan test) of controlled strain is that pitch conventional in the world at present accelerates fatigue specification test method
[1], after the method proposed from 2010, the critical point discrimination about process of the test medium pitch generation fatigue failure is in research state always, does not also have good index and parameter to characterize and distinguish the quality of different pitches anti-fatigue performance.
Summary of the invention
The object of the invention is judge the critical point of pitch accelerated fatigue test process in which materials generation fatigue failure and identify, thus the quantitative fatigue lifetime of comparison different pitches material under dynamic shearing load action.Specific embodiment of the invention process and analytical approach as follows.
The recognition methods of pitch generation fatigue failure under dynamic shearing load action, it is characterized in that application dynamic shear rheometer to parallel-plate bitumen samples at 5 DEG C ~ 30 DEG C arbitrary temperature, complete the linear amplitude scan test of controlled strain, the sweep limit of dynamic strain amplitude linearly increases to 30% from 0.1%, dynamic load frequency is 10Hz, and sweep time is designed to 5-15 minute; Then according to the shear stress τ collected in test and shear strain γ data, calculate empty shear strain γ
rthe virtual strain energy index W that in index and process of the test, material stores
r s; Finally, virtual strain energy W will be stored in process of the test
r speak point as the critical point of pitch fatigue failure, the CYCLIC LOADING times N corresponding to this unique point is the fatigue lifetime N of pitch under this temperature, loading frequency and loading speed
f.
Further, produce different loading speeds by the sweep time changing linear strain scan test, under same strain sweep limit, test temperature and loading frequency condition, the pitch fatigue lifetime identified under different loading speed is also by difference.
Further, 5 minutes are designed to sweep time.
Further, 10 minutes or 15 minutes are designed to sweep time.
More specifically:
(1) apply dynamic shear rheometer and linear strain scan test is carried out to parallel-plate bitumen samples, according to the code requirement of this test
[1], shear strain is from 0.1% linear increase to 30%, and test loading frequency is fixed as 10Hz, and optional 5 DEG C ~ 30 DEG C arbitrary temperature of test temperature, are designed to 5 minutes sweep time.
(2) the dynamic shearing loading speed applied in process of the test can be changed by the gated sweep time, keep strain sweep scope, test temperature and and the constant condition of loading frequency under, the present invention has also carried out the contrast test that sweep time is 10 minutes and 15 minutes.
(2), after having tested, test figure is analyzed according to following program;
I. shear strain (γ) data collected according to dynamic shear rheometer calculate empty shear strain (γ according to formula (1)
r) index, wherein | G
*|
0for the line viscoelasticity dynamic shear modulus of bitumen samples not damaged state under this specified temp and loading frequency, obtain by the small strain single-point dynamic test test of before linear strain scan test;
γ
R＝γ·|G
*|
0
(1)
Ii. shear stress (τ) data collected dynamic shear rheometer are at empty shear strain (γ
r) analyze under coordinate, see shown in accompanying drawing 1; Can (W to the virtual strain that material in each data point calculation process of the test stores according to formula (2)
r s) index, i.e. dotted portion area in accompanying drawing 1;
Iii. can (W with the storage virtual strain calculated
r s) numerical value is ordinate, the CYCLIC LOADING number of times (N) applied bitumen samples is horizontal ordinate mapping, sees shown in accompanying drawing 2, gets W
r speak point, as the critical point of pitch generation fatigue failure, can determine (N fatigue lifetime of bitumen samples under this specified temp, loading frequency and loading speed
f).
(3) (N fatigue lifetime will determined in the shear stress (τ) collected in dynamic shear rheometer and CYCLIC LOADING number of times (N) graph of a relation
f) mark, see shown in accompanying drawing 3.
List of references
[1]Standard Method of Test for Estimating Damage Tolerance of Asphalt Binders Usingthe Linear Amplitude Sweep[S].American Association of State Highway andTransportation Officials(AASHTO)TP 101-14.
Accompanying drawing explanation
Fig. 1 is the analysis of pitch accelerated fatigue test data under virtual strain coordinate and the sign of storage virtual strain energy
Fig. 2 is the EVOLUTION ANALYSIS storing virtual strain energy in pitch accelerated fatigue test process
Fig. 3 is the typical recognition result of accelerated fatigue test process medium pitch fatigue failure critical point
The identification contrast of Fig. 4 is sweep time matrix pitch and SBS modified bitumen generation fatigue failure when being 5 minutes
The identification contrast of Fig. 5 is sweep time matrix pitch and SBS modified bitumen generation fatigue failure when being 10 minutes
The identification contrast of Fig. 6 is sweep time matrix pitch and SBS modified bitumen generation fatigue failure when being 15 minutes
Fig. 7 is the contrast between pitch accelerated fatigue test determined fatigue lifetime and pitch actual fatigue lifetime
Embodiment
Embodiment one: in present embodiment, matrix pitch and SBS modified bitumen (being called for short SBS pitch) is adopted to carry out the accelerated fatigue test of controlled strain, test temperature 19 DEG C, test frequency 10Hz, linear strain sweep limit is 0.1% ~ 30%, is designed to sweep time complete for 5 minutes.After off-test, according to the fatigue lifetime that flow process identification two kinds of pitches of above-mentioned data analysis are respective under this operating mode, recognition result is shown in shown in accompanying drawing 4.
Embodiment two: the sweep time that linear strain scans that is not both of present embodiment and embodiment one is designed to 10 minutes, and other is identical with embodiment one.Recognition result is shown in shown in accompanying drawing 5.
Embodiment three: the sweep time that linear strain scans that is not both of present embodiment and embodiment one is designed to 15 minutes, and other is identical with embodiment one.Recognition result is shown in shown in accompanying drawing 6.
Embodiment four: not being both of present embodiment and embodiment one to embodiment three, asphalt material used is TP polymer modified asphalt (being called for short TP pitch) and rubber powder examination modified bitumen (abbreviation rubber asphalt), test temperature, strain sweep scope are identical with embodiment one to three with loading frequency, have carried out the accelerated fatigue test that sweep time is 5 minutes, 10 minutes and 15 minutes respectively.
The fatigue lifetime (repeated strain level is 5% and 7%) of the accelerated fatigue test recognition result of four kinds of pitch in above-mentioned embodiment under different loading speed and pitch reality is contrasted in fig. 7, can find out, there are good relevance the fatigue lifetime that under different loading speed, pitch accelerated fatigue test identifies and actual fatigue lifetime (5% repeated strain and 7% repeated strain), under different loading environment, the anti-fatigue performance sequence of pitch maintains consistent, demonstrate the scientific and effective that the present invention is directed to the pitch fatigue failure recognition methods that accelerated fatigue test proposes.
Claims (4)
1. the recognition methods of pitch generation fatigue failure under dynamic shearing load action, it is characterized in that application dynamic shear rheometer to parallel-plate bitumen samples at 5 DEG C ~ 30 DEG C arbitrary temperature, complete the linear amplitude scan test of controlled strain, the sweep limit of dynamic strain amplitude linearly increases to 30% from 0.1%, dynamic load frequency is 10Hz, and sweep time is designed to 5-15 minute; Then according to the shear stress τ collected in test and shear strain γ data, calculate empty shear strain γ
rthe virtual strain energy index W that in index and process of the test, material stores
r s; Finally, virtual strain energy W will be stored in process of the test
r speak point as the critical point of pitch fatigue failure, the CYCLIC LOADING times N corresponding to this unique point is the fatigue lifetime N of pitch under this temperature, loading frequency and loading speed
f.
2. pitch fatigue failure recognition methods according to claim 1, it is characterized in that the sweep time by changing linear strain scan test produces different loading speeds, under same strain sweep limit, test temperature and loading frequency condition, the pitch fatigue lifetime identified under different loading speed is also by difference.
3. pitch fatigue failure recognition methods according to claim 1, is characterized in that being designed to 5 minutes sweep time.
4. pitch fatigue failure recognition methods according to claim 1, is characterized in that being designed to 10 minutes or 15 minutes sweep time.
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| CN105891029A (en) * | 2016-06-30 | 2016-08-24 | 哈尔滨工业大学 | Pitch fatigue performance evaluation method based on fracture mechanic theory |
| CN106568661A (en) * | 2016-11-07 | 2017-04-19 | 株洲时代新材料科技股份有限公司 | Testing acquisition method of epsilon-N fatigue curve under rubber material typical bearing working conditions |
| CN109541192A (en) * | 2018-12-27 | 2019-03-29 | 北京工业大学 | A kind of evaluation method of road asphalt self-healing behavioral trait |
| CN109613221A (en) * | 2018-12-27 | 2019-04-12 | 北京工业大学 | A kind of test method of test road asphalt damage self-healing performance |
| CN116165082A (en) * | 2023-02-24 | 2023-05-26 | 哈尔滨工业大学 | Rapid acquisition method of asphalt strain-fatigue life curve |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105891029A (en) * | 2016-06-30 | 2016-08-24 | 哈尔滨工业大学 | Pitch fatigue performance evaluation method based on fracture mechanic theory |
| CN105891029B (en) * | 2016-06-30 | 2018-11-23 | 哈尔滨工业大学 | A kind of pitch fatigue behaviour evaluation method based on Theory of Fracture Mechanics |
| CN106568661A (en) * | 2016-11-07 | 2017-04-19 | 株洲时代新材料科技股份有限公司 | Testing acquisition method of epsilon-N fatigue curve under rubber material typical bearing working conditions |
| CN106568661B (en) * | 2016-11-07 | 2019-06-21 | 株洲时代新材料科技股份有限公司 | A kind of rubber material typical case carries ε~N curve of fatigue under operating condition and tests acquisition methods |
| CN109541192A (en) * | 2018-12-27 | 2019-03-29 | 北京工业大学 | A kind of evaluation method of road asphalt self-healing behavioral trait |
| CN109613221A (en) * | 2018-12-27 | 2019-04-12 | 北京工业大学 | A kind of test method of test road asphalt damage self-healing performance |
| CN116165082A (en) * | 2023-02-24 | 2023-05-26 | 哈尔滨工业大学 | Rapid acquisition method of asphalt strain-fatigue life curve |
| CN116165082B (en) * | 2023-02-24 | 2023-09-19 | 哈尔滨工业大学 | Rapid acquisition method of asphalt strain-fatigue life curve |
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