CN104713783B - A kind of method for detecting pitch self-healing intensity - Google Patents
A kind of method for detecting pitch self-healing intensity Download PDFInfo
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- CN104713783B CN104713783B CN201510166392.3A CN201510166392A CN104713783B CN 104713783 B CN104713783 B CN 104713783B CN 201510166392 A CN201510166392 A CN 201510166392A CN 104713783 B CN104713783 B CN 104713783B
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Abstract
The invention discloses a kind of method for detecting pitch self-healing intensity, it is main to pass through to use adhesive tape and the standardized asphalt membrane of Mold Making, then tensile failure experiment is carried out with testing machine, power displacement curve when record asphalt film is peeled off, it is the self-healing intensity index that can obtain pitch to calculate destructive power characteristic value.Time-temperature specificity analysis according to interface mechanicses, pitch Viscous Elastic Mechanics principle and great number tested data, fitting experimental data of the invention meets the self-healing strength theory of high molecular polymer, demonstrates the correctness of result of the test.Finally, self-healing intensity evaluation index of the invention is reduced to the average value of destructive power, and the index has accurately reflected the self-healing intensity of pitch, and convincingness is strong, and time saving convenience, and intuitive and convenient is applied widely.
Description
Technical field
The invention belongs to pitch self-healing technical field of performance test, especially a kind of side for detecting pitch self-healing intensity
Method.
Background technology
Asphalt pavement crack is the major issue for influenceing service life of road surface and level of comfort, and the road that China puts into for this
Face maintenance costs is very surprising.In this context, domestic and international researcher proposes the concept of self-healing pitch, i.e., changed by pitch
Property to strengthen the self-healing performance of pitch, can be sent out by its own unique physics chemical action when microcrack is produced
More behavior is conigenous, the purpose for repairing pavement crack is reached.At present, the research of self-healing pitch has been achieved for many progress, and
And self-healing pitch different types of and with certain practicality is have developed in succession.But it is directed to the healing of self-healing pitch
Intensity, goes back neither one unified evaluation criterion and method.
At present in terms of the evaluation of pitch self-healing, dynamic shear rheometer (DSR) is mainly used to enter asphalt material
Row fatigue-healing-fatigue test again.Compared in different healing times, different healing temperature, different healings by orthogonal test
The change of asphalt material performance before and after self-healing, determines complex shear modulus under conditions of degree of fatigue and variety classes
With two, phase angle important indicator.Existing several pitch self-healing evaluation indexes mainly have the change of asphalt modulus before and after healing
Asphalt material energy before and after the ratio between pitch fatigue rupture rate, the front and rear pitch bearing load number of times ratio of healing, healing before and after rate, healing
Ratio of density etc..In pitch DSR fatigue ruptures experiment, not macroscopic destruction is related merely by pitch
The change of performance speculates generation and the Healing strength of pitch self-healing, shows pitch crack self-healing with being unable to illustrative simplicity
The process and characteristic of conjunction.
And at present in terms of asphalt self-healing behavioral study, the main method for using is four-point bending fatigue examination
Test.In order to evaluate process of the test of the asphalt through " fatigue-healing-tired again ", the effect of test specimen healing considers emphasis
The change of modulus before and after healing.Because specimen molding and process of the test have many factors of instability, even same bitumen material
Material, the asphalt girder test specimen matched somebody with somebody of level of the same race, its modulus and fatigue life are all variant, result of the test exist it is very big from
Property is dissipated, so can't effectively characterize the effect of pitch self-healing using four-point bending fatigue test.
It is comprehensive at present for the present Research of pitch self-healing from the point of view of, the experiment such as DSR passes through pitch self-healing before and after test
The change of data, the process and healing properties of research pitch crack self-healing, can not intuitively reflect pitch self-healing indirectly
Close.And the research of asphalt self-healing is directed to, due to certainly existing for forming process difference, the self-healing of asphalt
There is larger discreteness in evaluation result, therefore result of the test lacks validity；Also, take during Asphalt Mixture Experiment research expense
Power, tedious process, are unfavorable for the development of research work.
The content of the invention
Goal of the invention：A kind of method for detecting pitch self-healing intensity is provided, to solve above-mentioned the asking of prior art presence
Topic.
Technical scheme：A kind of method for detecting pitch self-healing intensity, comprises the following steps：
Step 1, High temperature-resistanadhesive adhesive tape is attached on mould, the sticking one side of adhesive tape is exposed from the hole of mould, by mould
Tool is fixed on smooth desktop and the viscosity of adhesive tape is faced up；In this step, note making the smooth corrugationless of adhesive tape.
Step 2, experiment pitch is heated to liquid, the length direction along mould hole is toppled over, and is struck off, and makes pitch uniform
Uniform thickness coverage hole region；
After step 3, pitch are cooled to predetermined temperature, High temperature-resistanadhesive adhesive tape of tearing obtains sample asphalt membrane；It is generally acknowledged that making drip
Green grass or young crops is cooled between liquid and completely between solidification.
Step 4, a sample asphalt membrane is put on smooth desktop upwards, alignment is another downwards to take another sample asphalt membrane
One asphalt membrane make its alignment laminating, obtain complete sample, during not can extrude asphalt membrane, prevent asphalt membrane under extrusion by
Dynamic bonding, influences self-healing strength test；
Step 5, multigroup sample is prepared according to step 1~4, sets up the orthogonal experiment based on oven temperature and healing time,
Each sample is transferred in baking oven after completing, and according to different requirement of experiment, adjusts oven temperature and healing time, is made
Various sample by different temperatures and/or time treatment；
Step 6, sample is taken out from baking oven, the scheduled time is cooled down at room temperature；The room temperature refers to 20 ± 5 DEG C, is made a reservation for
Time is generally 60s-90s.
Step 7, the unnecessary adhesive tape one end of sample is torn to Asphalt Contactor face, the upper lower clamp of testing machine is clamped in respectively
In, and ensureing that sample is vertical, restrained stretching speed is 50 ± 10mm/min, and entrance power is 0.5~2.5N, and collection bitumen samples draw
Power-displacement data during stretching；
Step 8, after bitumen samples are broken as the single asphalt membrane of two panels, observation section failure mode simultaneously record as straight
See with reference to index；
Step 9, reach peak value for the first time from the data of power and reach peak value as data area to last time, computing power
Average value, as the index of pitch self-healing intensity.
In a further embodiment, the mould is rectangle, and material is nichrome, thickness is 0.2 ±
0.002mm, length is 30cm, and width is 4cm, and middle part offers length for 20cm, and width is the through hole of 1.5cm.The resistance to height
Warm glue is Kapton adhesive tapes.
Beneficial effect：Time-temperature characteristic according to interface mechanicses, pitch Viscous Elastic Mechanics principle and great number tested data
Analysis, fitting experimental data of the invention meets the self-healing strength theory of high molecular polymer, is demonstrating result of the test just
True property.Finally, self-healing intensity evaluation index of the invention is reduced to the average value of destructive power, and the index has accurately reflected pitch
Self-healing intensity, convincingness is strong, and time saving convenience, and intuitive and convenient is applied widely.
Brief description of the drawings
Fig. 1 is mould schematic diagram.
Fig. 2 show asphalt membrane schematic diagram.
Fig. 3 is that MTS tests schematic diagram.
Fig. 4 is the force-displacement curve figure of experimental data.
Fig. 5 and Fig. 6 is the fitting experimental data figure under different temperatures.
Specific embodiment
The present invention is further described with reference to the drawings and specific embodiments.In a certain specific embodiment of the invention, implement
Process is as follows：
1. High temperature-resistanadhesive adhesive tape is intactly attached on mould 6, adhesive tape toughness one side is revealed from mould rectangle hole 5
Go out, then mould is fixed on smooth desktop, adhesive tape toughness one faces up；
2. experiment pitch is heated to liquid, take a little with dixie cup in, topple over along mould hole lengths, with scoop along drip
Blue or green toppling direction strikes off, and makes pitch coverage hole region；
3. after pitch is slightly cooled down, High temperature-resistanadhesive adhesive tape of tearing 4 obtains final product sample asphalt membrane 2；
4. a sample asphalt membrane is put on smooth desktop upwards, takes another sample asphalt membrane and be directed at another drip downwards
Blue or green film makes its alignment laminating, obtains complete T-peel samples；
5. sample is immediately transferred among baking oven, according to different requirement of experiment, control different temperatures (for example, 20 DEG C,
40 DEG C, 60 DEG C) from different healing times (for example, 20 minutes, 30 minutes, 40 minutes, 1 hour, 12 hours, 1 day, 3 days, 1 week)
Asphalt membrane is set to heal；
6. sample is taken out from baking oven, 5min is cooled down at room temperature；
7. sample both sides are stepped up in the fixture 1 of MTS testing machines, restrained stretching speed 50mm/min, entrance power is 1N,
Power-displacement data in collection matrix pitch and EMAA modified pitch drawing process；
8. after treating that pitch is broken completely, observe section failure mode and record；
9. many experiments, the as average value of computing power, the index of pitch self-healing intensity.
Applicant thinks：The self-healing performance of asphalt comes from pitch, therefore this research is carried for pitch cracking healing
Going out new research evaluation method --- T-peel is tested.T-peel experiments utilize mechanics of materials boundary model, by what is specified
Mould and test method prepare test specimen --- asphalt film, the drip of two panels laminating is then tested by universal testing machine 3
Healing strength between blue or green film, can intuitively and effectively react pitch healing properties under given conditions and intensity.
T-peel tests pitch Healing strength mechanical model：The sample of this experiment is asphalt membrane 2 of the two panels to patch, in experiment
Adhesive tape where by stretching two panels asphalt film tests pulling force when two asphalt films are peeled off.At universal testing machine (MTS)
Drawing process in, make two panels pitch peel off stress predominantly direct stress, rather than shear stress, due to universal testing machine
(MTS) in drawing process, draw speed is uniform and stable, therefore does not exist between two panels asphalt film by acceleration generation
Inertia force, and tensile failure between two panels asphalt film is main is produced from the middle of interface, without in two panels asphalt film
Edge occurs, i.e. destruction betides the position of analysis of Stress Singularity of Interface End lower bound emaciated face sticky hair life point.
The self-healing intensity reason of the high molecular polymer proposed in 1981 according to Wool.R.P. and O'Connor.K.M.
By, should there is the structure reactance R of similar ultimate bearing capacity between two panels asphalt film, and due to the temperature of high molecular polymer
The presence of characteristic or time response, its drag R should be the function of healing time or healing temperature, and according to Elasticity and structure
Mechanics principle, in testing machine drawing process, the actual direct stress between two asphalt films is more than its structure reactance R, then two drips
Blue or green film is peeling-off.
R=Rh(t)*Φ(t)
Experiment acquires the T-peel test data (tables of 20 minutes, 25 minutes, 40 minutes and 1000 minutes at 25 DEG C respectively
1), with verify T-peel test reliability.
The matrix pitch time response of table 1 (25 DEG C)
Using Origin 8.0 to above-mentioned data described point, and utilize power function fitting.As shown in fig. 6, can be by above-mentioned data
It is fitted to power function y=9.609*x-0.236(degree of fitting R2=0.86).
Macromolecule healing theory points out RhT () is the self-healing intensity function of high molecular polymer, RhT () is proportional to t1/4, t
It is the self-healing time of macromolecular material, this fitting result with T-peel experiments (absolute value of time index is 0.237)
It is consistent.Therefore T-peel test datas meet macromolecule self-healing model, can accurately reflect out the Healing strength of pitch.
With reference to the data that T-peel is tested, it can be deduced that, the appearance of pitch release surface depends primarily on the strong of destruction interface
Degree, i.e., in MTS testing machine drawing process, with the applying of pulling force, (the drag R when stress exceeds intensity level<Stress S), boundary
Face is destroyed.Its weak boundary has the contact interface and pitch of two, i.e. two panels pitch for the test specimen used this experiment
With the contact interface of adhesive tape.Due to the presence of bubble, pitch is less than contact of the pitch with adhesive tape with the contact interface area of pitch
Interface.The latter is full interracial contact, and the former bubble portion hardly provides bearing capacity, thus with pitch and adhesive tape interface phase
Than initial pitch is larger with effective carrying unit area bearing capacity at Asphalt Contactor interface, but it effectively carries the gross area
It is smaller, thus bulk strength is smaller.In the case where healing time is very short, pitch reaches its intensity level with the stress of asphalt interface
When, pitch is also not up to limit value with the stress at adhesive tape interface.So in the case where interface globality is considered, destruction should be first
Produced from pitch and asphalt interface.Phase after healing, because pitch (effectively carries unit area to hold with the self-healing of asphalt interface
Loading capability becomes big, while effectively carrying the gross area becomes big), boundary strength (structure reactance R) has certain raising, in adhesive tape and drip
When stress between blue or green interface reaches its ultimate bearing capacity, its ultimate bearing energy is also not up between pitch and asphalt interface
Power.Thus, pitch will be peeled off with adhesive tape, and it is better to heal, and the area peeled off between adhesive tape and pitch is bigger, so that with more
The increase of conjunction time, the power that T-peel experiments are measured is smaller.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited in above-mentioned implementation method
Detail, in range of the technology design of the invention, various equivalents can be carried out to technical scheme, this
A little equivalents belong to protection scope of the present invention.It is further to note that described in above-mentioned specific embodiment
Each particular technique feature, in the case of reconcilable, can be combined by any suitable means.In order to avoid not
Necessary repetition, the present invention is no longer separately illustrated to various possible combinations.Additionally, a variety of implementations of the invention
Can also be combined between mode, as long as it is without prejudice to thought of the invention, it is public that it should equally be considered as institute of the invention
The content opened.
Claims (7)
1. it is a kind of detect pitch self-healing intensity method, it is characterised in that comprise the following steps：
Step 1, High temperature-resistanadhesive adhesive tape is attached on mould, the sticking one side of adhesive tape is exposed from the hole of mould, mould is consolidated
It is scheduled on smooth desktop and make the viscosity of adhesive tape to face up；
Step 2, experiment pitch is heated to liquid, the length direction along mould hole is toppled over, and is struck off, and makes the uniform uniform thickness of pitch
Coverage hole region；
After step 3, pitch are cooled to predetermined temperature, High temperature-resistanadhesive adhesive tape of tearing obtains sample asphalt membrane；
Step 4, a sample asphalt membrane is put on smooth desktop upwards, takes another sample asphalt membrane and be directed at another drip downwards
Blue or green film make its alignment laminating, obtain complete sample, during not can extrude asphalt membrane, prevent asphalt membrane from passively gluing under extrusion
Close, influence self-healing strength test；
Step 5, multigroup sample is prepared according to step 1~4, set up the orthogonal experiment based on oven temperature and healing time, each
Sample is transferred in baking oven after completing, and according to different requirement of experiment, adjusts oven temperature and healing time, makes difference
Sample by different temperatures and/or time treatment；
Step 6, sample is taken out from baking oven, the scheduled time is cooled down at room temperature；
Step 7, the unnecessary adhesive tape one end of sample is torn to Asphalt Contactor face, be clamped in respectively in the upper lower clamp of testing machine, and
Ensure that sample is vertical, restrained stretching speed is 50 ± 10mm/min, entrance power is 0.5~2.5N, and collection bitumen samples were stretched
Power-displacement data in journey；
Step 8, after bitumen samples are broken as the single asphalt membrane of two panels, observation section failure mode is simultaneously recorded as ginseng directly perceived
According to index；
Step 9, reach peak value for the first time from the data of power and reach peak value as data area to last time, computing power it is average
Value, as the index of pitch self-healing intensity.
2. the method for detecting pitch self-healing intensity as claimed in claim 1, it is characterised in that the mould is rectangle, material
Matter is nichrome, and thickness is 0.2 ± 0.002mm, and length is 30cm, and width is 4cm, and middle part offers length for 20cm, wide
Spend the through hole for 1.5cm.
3. the method for detecting pitch self-healing intensity as claimed in claim 1, it is characterised in that if not entering immediately after the completion of sample
, then be placed on asphalt film at lucifuge and preserve by row tension test, and horizontal positioned is preventing pitch from flowing during preservation.
4. the method for detecting pitch self-healing intensity as claimed in claim 1, it is characterised in that the high-temperature plastic is Kapton
Adhesive tape.
5. the method for detecting pitch self-healing intensity as claimed in claim 1, it is characterised in that in step 1, in adhesive tape of paste
When, adhesive tape is kept smooth.
6. the method for detecting pitch self-healing intensity as claimed in claim 1, it is characterised in that in step 3, cool down pitch
To between liquid and completely between solidification state.
7. the method for detecting pitch self-healing intensity as claimed in claim 1, it is characterised in that in step 6, takes out sample
Afterwards, cooled down 60~90 seconds at 20 ± 5 DEG C.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105675404A (en) * | 2016-01-06 | 2016-06-15 | 北京东方雨虹防水工程有限公司 | Portable coiled material tester and coiled material test method |
| CN105758765A (en) * | 2016-03-01 | 2016-07-13 | 武汉理工大学 | Test and calculation method for optimum self-healing temperature and shortest self-healing time of asphalt |
| 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 |
| CN109668778B (en) * | 2019-01-17 | 2021-04-27 | 安徽建筑大学 | Use method of anti-bending electromagnetic self-healing experiment clamp for asphalt mixture |
| CN113720703A (en) * | 2021-09-15 | 2021-11-30 | 南京林业大学 | Method for researching mechanism of graphene for enhancing mechanical properties of asphalt |
| CN114112901B (en) * | 2021-12-08 | 2024-01-30 | 上海煤科检测技术有限公司 | Experimental device and method for testing characteristics of reactive polymer materials for coal mine |
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| CN102788873A (en) * | 2012-08-31 | 2012-11-21 | 郑州大学 | Simulation tester for self healing of asphalt concrete cracks |
| CN102879271A (en) * | 2012-09-29 | 2013-01-16 | 长安大学 | Method and device for detecting bituminous mortar damage self-healing performance |
| CN102879272A (en) * | 2012-09-29 | 2013-01-16 | 长安大学 | Method for evaluating damage self-healing capacity of asphalt mortar |
| CN202814795U (en) * | 2012-09-29 | 2013-03-20 | 长安大学 | Detection device for self-healing of bituminous mortar |
| CN103487333A (en) * | 2013-10-11 | 2014-01-01 | 东南大学 | Asphalt mixture self-healing capability evaluating method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102788873A (en) * | 2012-08-31 | 2012-11-21 | 郑州大学 | Simulation tester for self healing of asphalt concrete cracks |
| CN102879271A (en) * | 2012-09-29 | 2013-01-16 | 长安大学 | Method and device for detecting bituminous mortar damage self-healing performance |
| CN102879272A (en) * | 2012-09-29 | 2013-01-16 | 长安大学 | Method for evaluating damage self-healing capacity of asphalt mortar |
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| CN103487333A (en) * | 2013-10-11 | 2014-01-01 | 东南大学 | Asphalt mixture self-healing capability evaluating method |
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