CN109580396A - A kind of test method of bituminous pavement superficial layer load fatigue damage degree - Google Patents
A kind of test method of bituminous pavement superficial layer load fatigue damage degree Download PDFInfo
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- CN109580396A CN109580396A CN201811469503.8A CN201811469503A CN109580396A CN 109580396 A CN109580396 A CN 109580396A CN 201811469503 A CN201811469503 A CN 201811469503A CN 109580396 A CN109580396 A CN 109580396A
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- 230000006378 damage Effects 0.000 title claims abstract description 42
- 238000010998 test method Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 52
- 238000009661 fatigue test Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000011156 evaluation Methods 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 45
- 239000002344 surface layer Substances 0.000 claims description 12
- 239000010426 asphalt Substances 0.000 claims description 11
- 238000009533 lab test Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 description 9
- 238000012423 maintenance Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
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- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
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- 239000005442 atmospheric precipitation Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
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- 238000000465 moulding Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0026—Combination of several types of applied forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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Abstract
The invention discloses a kind of test methods of bituminous pavement superficial layer load fatigue damage degree, belong to road engineering the field of test technology.Test method of the present invention specifically: it is the superficial layer core sample of 15cm that diameter is respectively taken at the wheel path and urgent stop band of tested bituminous pavement superficial layer；Institute's coring sample is cut into the cube specimen of a length of 10cm square of Surface Edge, then it is the rectangular cube specimen of 10cm × 5cm that the test specimen, which is averagely cut into two surfaces,；The fatigue life of test specimen is obtained by the fatigue test of Stress Control；The difference of the fatigue life of region test specimen and urgent stop take the ratio of fatigue Life as the evaluation index of tested bituminous pavement superficial layer load fatigue damage degree using at two, ratio is bigger, shows that bituminous pavement superficial layer load fatigue damage degree is more serious.The present invention can it is accurate, reliable, objectively evaluate bituminous pavement superficial layer load fatigue damage degree severity, and method is simple and easy.
Description
Technical field
The present invention relates to road engineering the field of test technology more particularly to bituminous pavement superficial layer load fatigue damage degrees
Test method.
Background technique
Under the repeated action of the composite factors such as traffic loading, natural environment, the material for constructing bituminous pavement can be produced gradually
Raw fatigue damage, causes road surface all kinds of diseases occur, wherein fatigue cracking is one of Major Diseases type of bituminous pavement.Pitch
Fatigue cracking, which occurs, in road surface will affect the structural stability on road surface, be unfavorable for the long-term preservation of pavement structure, in bituminous pavement
During pipe is supported, need that necessary scheme is taken to carry out preventive maintenance before fatigue cracking occurs in bituminous pavement, in scheme system
Periodically, the selection of maintenance timing is particularly important, if maintenance timing selection is later, superficial layer fatigue crack is had already appeared, and leads
Cause atmospheric precipitation, surface water it is isotonic enter pavement structure in, under action of traffic loading, the effect of moisture will aggravate sub-surface knot
There is structural destruction in structure even roadbed, but maintenance timing selection is too early, and ground surface material gives full play to its structural strength not yet,
The waste of maintaining cost will be caused again, therefore, it is necessary to the fatigue cracking rule of development of bituminous pavement be grasped, in order to select to close
Suitable pavement maintenance & rehabilitation opportunity.
For the semi-rigid asphalt pavement in China, sphere of action of the superficial layer bituminous concrete in wheel load
Tension state can be presented in interior (wheel path), be the layer position for being most also easy to produce fatigue cracking, therefore, the fatigue of to master bituminous pavement
Cracking pattern should grasp the fatigue cracking rule of superficial layer first.During pavement usage, in climatic environmental factor and wheel lotus
Under the repeat function of load, damage is built up, and pavement structural strength is gradually reduced, after load action is more than certain number,
The stress generated in road surface under load action will be more than decline after structure reactance, make road surface it is cracked, generate fatigue
Cracking, tired essence is all the increase with cycle-index, damages the process gradually accumulated, therefore, can be mixed according to pitch
The fatigue damage degree for coagulating soil characterizes its fatigue cracking rule.For damaging parameter D, road engineering circle is extensively with Miner at present
Linear Fatigue Damage Model indicates:
In formula: N is load ringing number；NfFor fatigue life.
Based on above formula it is found that the key for grasping bituminous pavement superficial layer load fatigue damage degree is accurate acquisition superficial layer
Fatigue life when fatigue life after load action and non-imposed load, the attenuation degree of fatigue life is fatigue damage
Degree, fatigue life decaying is bigger, and fatigue damage degree is more serious, and vice versa.
It is currently for indoor molding asphalt, with reality about most of research of Fatigue Damage of Asphalt Mixture
Different from the practical Material composition design used of body engineering can not consider that actual loading and natural environment are special to its fatigue
The influence of property, even if a few studies are studied based on fatigue properties of the core sample to bituminous pavement, but does not consider superficial layer
Practical status under loading designs test method, causes test result reliability not strong, therefore, it is necessary to invent a kind of consideration entity
The practical status under loading of bituminous pavement superficial layer evaluates the test method of bituminous pavement superficial layer load fatigue damage.
Technical problem to be solved by the present invention lies in China, there has been no mature technical standards to evaluate bituminous pavement table
Surface layer load fatigue damage degree provides a kind of consideration entity bituminous pavement superficial layer practical status under loading, evaluates bituminous pavement
It is tired can comprehensively, accurately, objectively to evaluate bituminous pavement superficial layer load for the test method of superficial layer load fatigue damage degree
Labor degree of injury, and it is easy to operate.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem:
A kind of test method of bituminous pavement superficial layer load fatigue damage degree, which is characterized in that in tested pitch
It is the superficial layer core sample of 15cm that the wheel path of road surface layer and urgent stop, which respectively take diameter with place,；Institute's coring sample is cut first
At the cube specimen of a length of 10cm square of Surface Edge, then it is 10cm × 5cm that the cube, which is averagely divided into two surfaces,
Cube specimen；Test specimen is placed on universal testing machine to the fatigue test for carrying out three branch loads, obtains the tired longevity of test specimen
Life；The difference of the fatigue life of the test specimen in region and urgent stop take the ratio of fatigue Life as testing and drip using at two
The evaluation index of green road surface layer load fatigue damage degree, ratio is bigger, shows that bituminous pavement superficial layer load fatigue is damaged
It is more serious to hurt degree.The present invention can it is accurate, reliable, objectively evaluate bituminous pavement superficial layer load fatigue damage degree, and
Method is simple and easy.
Preferably, direction of traffic is indicated when coring so that the side of 5cm is consistent with direction of traffic, i.e., the side of 10cm perpendicular to
Direction of traffic.
It preferably, must be placed below by the road surface of test specimen when carrying out the fatigue test of Stress Control.This makes table
Surface layer is in tension state along direction of traffic, identical as practical surface conditions.
Compared with prior art, the invention has the following advantages:
The present invention is in such a way that coring carries out fatigue test come test evaluation bituminous pavement superficial layer load fatigue damage
Degree, the test method compared with existing indoor shaping test piece is more accurate reliable, test result more objective reality；
The load-bearing direction of core sample is marked in location of the coring procedure of the present invention, and makes the load-bearing shape of test specimen during fatigue test
State is consistent with the status under loading of practical bituminous pavement superficial layer, and test result is relatively reliable；
It is the face of 15cm that the present invention respectively takes diameter at the wheel path and urgent stop band of tested bituminous pavement superficial layer
Layer core sample, and the difference of the average value of the fatigue life of the test specimen in region and urgent stop take the flat of the fatigue life of test specimen at two
Test method of the ratio of mean value as tested bituminous pavement superficial layer fatigue damage degree, test result are more acurrate；
Test method of the present invention is simple and easy.
Detailed description of the invention
Fig. 1 is the bituminous pavement superficial layer circular core sample plan view that coring obtains mark direction of traffic
Fig. 2 is the core sample plan view for cutting to be square to surface
Fig. 3 is that cutting obtains the plan view of fatigue test two parallel test specimens
Fig. 4 is the schematic diagram of three branch loading fatigue tests
Specific embodiment
Technical solution of the present invention is described in detail with reference to the accompanying drawing:
In view of the deficiencies of the prior art, thinking of the invention is template surface layer actual forced status, by using omnipotent
Material test specimen machine carries out the severity of the fatigue test evaluation bituminous pavement superficial layer fatigue damage of three branch loads to test specimen.
It is found in practice, superficial layer is in tension state along direction of traffic, therefore can be placed in downward the road surface layer of test specimen
Bending pulling fatigue experimental is carried out in universal testing machine, compares the test specimen at wheel path and is located at test specimen at urgent stop band
Fatigue life average value, the severity of each wheel path superficial layer fatigue damage is evaluated with damage factor.
Specifically, it is the table of 15cm that diameter is respectively taken at the wheel path of tested bituminous pavement superficial layer and urgent stop band
Surface layer core sample；Institute's coring sample is cut into the cube specimen of a length of 10cm square of Surface Edge first, then the cube is put down
It is divided into the cube specimen that two surfaces are 10cm × 5cm；Test specimen is placed on universal testing machine and carries out Stress Control
Fatigue test obtains the fatigue life of test specimen；Test specimen is taken with the difference of the fatigue life of the test specimen in region at two and urgent stop
Evaluation index of the ratio of fatigue life as tested bituminous pavement superficial layer load fatigue damage degree, ratio is bigger, table
Bright bituminous pavement superficial layer load fatigue damage degree is more serious.The present invention can it is accurate, reliable, objectively evaluate bituminous pavement
Superficial layer load fatigue damage degree, and method is simple and easy.
Preferably, direction of traffic is indicated when coring, so that the side 5cm of fatigue test test specimen is consistent with direction of traffic, i.e.,
The side 10cm is perpendicular to direction of traffic.
It preferably, must be placed below by the road surface of test specimen when carrying out the fatigue test of three branch loads.This makes
Surface is in tension state along direction of traffic, identical as practical surface conditions.
The load-bearing size of test specimen and practical road surface layer load-bearing are in the same size when preferably, in order to guarantee laboratory test,
Being further applied load the present invention is based on laboratory test should make promptly to stop band test specimen bottom flexural-tensile strain and standard axle load on practical road surface
On the thinking equal to flexural-tensile strain caused by superficial layer when driving, using finite element method theoretical analysis result and a large amount of
On the basis of laboratory test results comparative analysis, the payload values that two kinds of common upper layer asphalts are applied are proposed:
SMA-13 asphalt is further applied load as 2.8kN；AC-13 asphalt is further applied load as 3.2kN.
For the ease of public understanding, technical solution of the present invention is illustrated with specific embodiment below.
For bituminous pavement to be tested, direction of traffic is marked in the place marking pen of quasi- coring first, as shown in figure 1 arrow
Shown in head；Then stopped using road surface corning machine from the bituminous pavement superficial layer wheel path and the urgent of non-imposed load of imposed load
It is the round surface layer core sample of 15cm by respectively taking diameter with place；
The core sample surface that scene is taken is cut into the square of 10cm, thickness remains unchanged, and is that road surface layer is practical
Thickness d notices that the Bian Yingyu direction of traffic of square when cutting is parallel or vertical, as shown in Figure 2；
The vertical direction of traffic of core sample after cutting is averagely cut, is divided into two to obtain two test specimens, gained surface of test piece
For the rectangle of 5cm × 10cm, wherein the side of 5cm is consistent with direction of traffic, and the side of 10cm is vertical with direction of traffic, such as Fig. 3 institute
Show；
Test specimen is placed on universal testing machine to the fatigue test for carrying out three branch loads, core sample surface is under, bottom surface
Upper, the spacing in mold between two fulcrums is 8cm, and test temperature controls at 15 DEG C, SMA-13 asphalt is applied
Load N be 2.8kN, the load N applied for AC-13 asphalt is 3.2kN, as shown in Fig. 4.
Fatigue test is carried out to two test specimens respectively and obtains its fatigue life, it is assumed that N1Promptly to stop two test specimens of band
Fatigue life average value, N2It will by means of the basic theories of damage mechanics for the fatigue life average value of two test specimens of wheel path
Fatigue life, then the calculation formula of damage factor D was as follows as damage variable:
Under not damaged state, then wheel path fatigue life N1Band fatigue life N is stopped with urgent2It is equal, D=0；Damage completely
Hurt under state then wheel path fatigue life N2It is 0, D=1；Wheel path fatigue life is smaller, and D is bigger, bituminous pavement superficial layer lotus
It is bigger to carry fatigue damage.
In summary, test method proposed by the present invention fully considers the practical status under loading of bituminous pavement superficial layer, makes
The fatigue life of bituminous pavement load-bearing superficial layer in entity project can accurately, reliably be reflected by obtaining laboratory test results, thus
It is compared and analyzed with urgent fatigue life of the stop with bituminous pavement superficial layer not by load action, accurate, the reliable palm
Hold bituminous pavement superficial layer load fatigue damage situation.
Claims (6)
1. a kind of test method of bituminous pavement superficial layer load fatigue damage degree, which is characterized in that in tested asphalt road
It is the superficial layer core sample of 15cm that the wheel path of face superficial layer and urgent stop, which respectively take diameter with place,；Institute's coring sample is cut into first
The cube specimen of a length of 10cm square of Surface Edge, then it is 10cm × 5cm's that the cube, which is averagely divided into two surfaces,
Cube specimen；Test specimen is placed on universal testing machine to the fatigue test for carrying out three branch loads, obtains the fatigue life of test specimen；
The difference of the fatigue life of the test specimen in region and urgent stop take the ratio of fatigue Life as tested pitch using at two
The evaluation index of road surface layer load fatigue damage degree, ratio is bigger, shows bituminous pavement superficial layer load fatigue damage
Degree is more serious.The present invention being capable of accurate, reliable, objectively evaluation bituminous pavement superficial layer load fatigue damage degree, and side
Method is simple and easy.
2. test method as described in claim 1, which is characterized in that direction of traffic is indicated when coring, so that test test specimen 5cm
Side is consistent with direction of traffic, i.e. the side of 10cm is perpendicular to direction of traffic.
3. test method as described in claim 1, which is characterized in that, must be by test specimen when carrying out the fatigue test of Stress Control
Corresponding bituminous pavement surface is placed below.
4. test method as described in claim 1, which is characterized in that fatigue test temperature is 15 DEG C.
5. test method as described in claim 1, which is characterized in that the spacing of two fulcrums is 8cm when fatigue test.
6. test method as described in claim 1, which is characterized in that fatigue test, which is further applied load, should make promptly to stop band test specimen
Flexural-tensile strain caused by the surface layer of road is equal when driving on bituminous pavement for bottom flexural-tensile strain and standard axle load, is based on finite element
Theoretical analysis result and a large amount of laboratory test results comparative analyses, for common upper layer asphalt, SMA-13
Asphalt is further applied load as 2.8kN, and AC-13 asphalt is further applied load as 3.2kN.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110455651A (en) * | 2019-08-12 | 2019-11-15 | 武汉理工大学 | A kind of antifatigue cracking performance evaluation method of bituminous pavement based on cuboid test specimen |
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