CN109765094B - Use method of self-healing and self-collecting clamp for split asphalt mixture test piece - Google Patents
Use method of self-healing and self-collecting clamp for split asphalt mixture test piece Download PDFInfo
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- CN109765094B CN109765094B CN201910044226.4A CN201910044226A CN109765094B CN 109765094 B CN109765094 B CN 109765094B CN 201910044226 A CN201910044226 A CN 201910044226A CN 109765094 B CN109765094 B CN 109765094B
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- 238000012360 testing method Methods 0.000 title claims abstract description 96
- 239000010426 asphalt Substances 0.000 title claims abstract description 35
- 239000000203 mixture Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000002474 experimental method Methods 0.000 claims abstract description 56
- 230000035876 healing Effects 0.000 claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims description 49
- 230000005674 electromagnetic induction Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000003776 cleavage reaction Methods 0.000 claims description 3
- 230000007017 scission Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 6
- 239000011384 asphalt concrete Substances 0.000 description 5
- 230000008439 repair process Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
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- 238000012423 maintenance Methods 0.000 description 2
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- 239000004836 Glue Stick Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
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- 238000011002 quantification Methods 0.000 description 1
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Abstract
The invention discloses a use method of a self-healing and self-collecting clamp after asphalt mixture test piece splitting, which comprises the steps of opening an upper box clamp and a lower box clamp of the clamp, placing a Marshall test piece into the clamp, closing the upper box clamp and the lower box clamp after the Marshall test piece loses the external force action, opening a shell again, keeping the shell in an open state by using a trigger rod, placing the test piece and the clamp on a splitting experimental instrument, aligning a rectangular through groove on a frame in the middle of the clamp with a pressing strip, fixing the clamp, starting a splitting experiment, extruding a trigger rod after the test piece is crushed, disconnecting point contact on the upper part of the trigger rod, and rotating the trigger rod out of the through groove and a trigger rod rotating groove. The accuracy of the healing experiment result data after the asphalt mixture test piece is split is influenced.
Description
Technical Field
The invention belongs to the technical field of asphalt pavement performance testing, and particularly relates to a use method of a self-healing and self-collecting clamp after an asphalt mixture test piece is split.
Background
The asphalt pavement can generate cracks, looseness and other diseases under the action of long-term driving load, temperature stress, reflection cracks of a semi-rigid base layer and other factors. And the existing polymer materials for maintaining and repairing the asphalt pavement, such as a waterproof agent, an asphalt regenerant and the like, can affect the maintenance cost and the use of the pavement to different degrees. However, the asphalt pavement has the self-healing capacity and can be self-healed at normal temperature, and the asphalt pavement can repair the defects of crack loosening and the like of the asphalt concrete pavement caused by low temperature, fatigue and base reflection through the self-healing, so that the service life of the asphalt concrete pavement can be prolonged, the maintenance and repair of the pavement are reduced, and the economic and traffic benefits are brought. However, since the self-healing speed of the asphalt pavement is very slow in a natural state and no circulation action of a traffic load is required outside, the repair rate of the asphalt is improved when the binder in the asphalt mixture is subjected to high temperature in an intermittent period. Compared with the repair measures such as a sealant and the like, the self-healing technology of the asphalt concrete pavement does not bring negative effects such as anti-skid performance and the like to the repair of the pavement. Therefore, domestic and foreign scholars widely develop researches on the induction heating self-healing technology of the asphalt pavement, and the researches do not leave a large number of indoor experiments, and certainly do not leave experimental devices for simulating the electromagnetic induction self-healing of the asphalt pavement.
At present, most researchers of scholars are biased to research on the performance of the electromagnetic asphalt concrete and induction heating devices, and research on test piece clamps during heating is less common. At present, most of experiments are simple and violent for the use of clamps in the self-healing process, three-point bending fracture experiments are generally carried out on a trabecular test piece to obtain the fracture strength of the trabecular test piece, then fracture surfaces are tightly attached together, heating self-healing is carried out, the three-point bending fracture experiments are carried out again after the test piece is cooled at room temperature to obtain the fracture strength of each trabecular test piece after healing, and the healing efficiency is judged by comparing the fracture strengths before and after healing. However, the trabecula is broken and then is spliced manually to cause the loss of stones, so that the gap of the broken surface is increased, the healing of a test piece is hindered, the error of an experimental result is improved, and the quantification of the experimental result and the improvement of the accuracy of the experimental data are not facilitated.
When carrying out the healing experiment behind the bituminous mixture test piece splitting at present, bituminous mixture test piece unilateral superheating is not convenient for the healing of test piece and is leaded to the pitch ageing with higher speed, influences the accuracy nature of healing experiment behind the bituminous mixture test piece splitting, simultaneously, when carrying out the healing experiment behind the bituminous mixture test piece splitting, the experimenter splices the test piece repeatedly, and the operation is numerous and diverse to can constantly increase the difference of test piece and original state, the error increases along with the increase of repeated experiment number of times.
Disclosure of Invention
The invention aims to provide a using method of a self-healing and self-collecting clamp after an asphalt mixture test piece is split, which aims to solve the problems that when an existing method is adopted for an asphalt mixture test piece healing experiment, one side of the asphalt mixture test piece is overheated, and the asphalt mixture test piece healing is not facilitated, and the problems that the test piece is manually spliced after the asphalt mixture test piece is split, the operation is complicated, and the experiment error is gradually increased along with the experiment repetition.
In order to achieve the purpose, the invention provides the following technical scheme: a use method of a self-healing and self-collecting clamp for an asphalt mixture test piece after splitting comprises the following steps:
the method comprises the following steps: opening an upper box clamp and a lower box clamp of the clamp, putting the Marshall test piece into the clamp, closing the upper box clamp and the lower box clamp without external force, opening the shell again, keeping the shell in an open state by using a trigger rod, and putting the test piece and the clamp on the splitting experiment instrument;
step two: aligning the rectangular through groove on the middle frame of the clamp with the pressing strip, fixing the clamp, and starting a splitting experiment;
step three: after the test piece is damaged, the trigger rod can be extruded, the upper point of the trigger rod is in contact with and disconnected with each other, the trigger rod is rotated out of the trigger rod through groove and the trigger rod is rotated out of the groove, and the clamp is closed;
step four: after the splitting experiment is finished, taking out the test piece together with the clamp, enabling the side face of the clamp to face an electromagnetic heating coil to perform an electromagnetic induction heating healing experiment, and stopping heating after the side face of the clamp is heated to the temperature t;
step five: and after the heating is stopped for T1, the clamp is turned over, the other side surface of the clamp is heated, the clamp is continuously heated to the temperature T, the heating interval time T1 between the two side surfaces and the time required for heating the other side surface to the temperature T provide the time for the heating side surface to transfer heat to the interior of the test piece in the fourth step, so that the temperature distribution is more uniform, and one surface of the test piece is prevented from being overheated. Repeating the steps to achieve the effect of discontinuously heating the asphalt mixture test piece, and turning and heating the asphalt mixture test piece for x times until the test piece is healed;
step six: and taking out the test piece and the clamp after heating healing, opening the shell, keeping the shell in an open state by using the trigger rod, placing the test piece and the clamp on the splitting experiment instrument, repeating the steps II, III, IV, V and VI to perform experiments for a plurality of times, wherein the heating interval time between two side surfaces of the second experiment performed later is T2, and the heating interval time between two side surfaces of the third experiment performed later is T3 … until the test piece cannot heal after the nth damage. The n th splitting test piece splitting strength is recorded to be Fn, the n +1 th splitting test piece splitting strength is Fn +1, the healing rate H of the test piece after healing through electromagnetic heating is defined as the ratio of Fn +1 to Fn, and when the H is equal to or less than 50% of Fn +1/Fn, the test piece is considered to be incapable of healing again, and the circulation experiment is stopped.
Preferably, in the first step, the upper end of the trigger rod is in point contact with the upper box clamp, and the lower end of the trigger rod is hinged with the lower box clamp.
Preferably, the heating interval Tn +1 between the two sides after the cleavage experiment is greater than Tn.
Compared with the prior art, the invention has the following beneficial effects:
(1) the experimental method adopted by the invention solves the problem that the test piece is damaged again due to local overheating in the heating and healing process of the test piece through intermittent heating, and gives enough time for inward heat transfer of the overheated part of the test piece, so that the temperature distribution in the asphalt mixture test piece is more uniform; the problems of poor healing effect and energy waste caused by overhigh heating temperature or overlong heating time are solved, and the problems that when a healing experiment is carried out after the asphalt mixture test piece is split, the healing of the test piece is not convenient due to the fact that the single side of the asphalt mixture test piece is overheated, and the accuracy of data of the healing experiment result after the asphalt mixture test piece is split is influenced are solved.
(2) The method provided by the invention is matched with the clamp for use, so that the problem that after the traditional test piece is split, the splitting experiment can not be completed again when the die for collecting the broken test piece is not demoulded after the test piece is heated and healed is solved. The experiment method matched clamp has the functions of repeatedly and automatically collecting test piece fragments and fragments after the splitting experiment and performing the self-healing experiment without demoulding under the condition of no demoulding, can complete the circulation of the splitting experiment and the self-healing experiment under the condition of no demoulding, is convenient and quick in experiment steps, improves experiment efficiency, and is obvious in time benefit.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a perspective view of the present invention;
FIG. 3 is a side view of the present invention;
FIG. 4 is an external view of the present invention;
FIG. 5 is a schematic view of a bead placement method of the present invention;
fig. 6 is a schematic view of electromagnetic heating according to the present invention.
In the figure: 1-upper box clamp, 2-middle frame, 3-top torsion spring, 4-trigger rod, 5-heat-resistant sponge, 6-rectangular through groove, 7-trigger rod through groove, 8-trigger rod turning-out groove, 9-lower box clamp, 10-heat-resistant sponge strip and 11-bottom torsion spring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the present invention provides the following technical solutions: the utility model provides a self-collecting anchor clamps that electromagnetism self-healing after bituminous mixture test piece splitting, includes middle part frame 2, its characterized in that: the rectangle has all been seted up on the top and the bottom of middle part frame 2 and has been led to groove 6, the top left and right sides of middle part frame 2 is connected with box clamp 1 through top torque spring 3, the bottom left and right sides of middle part frame 2 is connected with through bottom torque spring 11 and presss from both sides 1 corresponding lower box clamp 9 with last box, go up the inside of box clamp 1 and seted up the trigger bar and lead to groove 7, the inside of lower box clamp 9 has been seted up the trigger bar and has been changeed out groove 8, the inboard that the trigger bar changes out groove 8 is connected with trigger bar 4 through the pivot.
The inner sides of the upper box clamp 1 and the lower box clamp 9 are adhered with heat-resistant sponge 5.
The trigger bar 4 is set as a light hard glue stick.
The side surfaces of the upper box clamp 1 and the lower box clamp 9 are both provided with a torsion spring mounting and positioning circular groove.
The upper box clamp 1 and the lower box clamp 9 are both heat-resistant box body structures.
The inner side of the middle frame 2 is pasted with a heat-resistant sponge strip 10.
One end of the top torsion spring 3 is fixed at the inner side of the upper box clamp 1, and the other end of the top torsion spring 3 is fixed at the inner side of the middle frame 2.
All parts of the clamp are made of non-electromagnetic induction materials.
A use method of a self-healing and self-collecting clamp for an asphalt mixture test piece after splitting comprises the following steps:
the method comprises the following steps: opening an upper box clamp 1 and a lower box clamp 9 of the clamp, putting a Marshall test piece into the clamp, closing the upper box clamp 1 and the lower box clamp 9 after losing the external force, opening the shell again, keeping the shell in an open state by using a trigger rod 4, and putting the test piece and the clamp on the splitting experimental instrument;
step two: aligning the rectangular through groove 6 on the middle frame 2 of the clamp with the pressing strip, fixing the clamp and starting a splitting experiment;
step three: after the test piece is damaged, the trigger rod 4 is extruded, so that the upper point contact of the trigger rod 4 is disconnected, the trigger rod 4 is rotated out of the trigger rod through groove 7 and the trigger rod is rotated out of the groove 8, and the clamp is closed;
step four: after the splitting experiment is finished, taking out the test piece together with the clamp, enabling the side face of the clamp to face an electromagnetic heating coil to perform an electromagnetic induction heating healing experiment, and stopping heating after the side face of the clamp is heated to the temperature t;
step five: and after the heating is stopped for T1, the clamp is turned over, the other side surface of the clamp is heated, the clamp is continuously heated to the temperature T, the heating interval time T1 between the two side surfaces and the time required for heating the other side surface to the temperature T provide the time for the heating side surface to transfer heat to the interior of the test piece in the fourth step, so that the temperature distribution is more uniform, and one surface of the test piece is prevented from being overheated. Repeating the steps to achieve the effect of discontinuously heating the asphalt mixture test piece, and turning and heating the asphalt mixture test piece for x times until the test piece is healed;
step six: and taking out the test piece and the clamp after heating healing, opening the shell, keeping the shell in an open state by using the trigger rod, placing the test piece and the clamp on the splitting experiment instrument, repeating the steps II, III, IV, V and VI to perform experiments for a plurality of times, wherein the heating interval time between two side surfaces of the second experiment performed later is T2, and the heating interval time between two side surfaces of the third experiment performed later is T3 … until the test piece cannot heal after the nth damage. The n th splitting test piece splitting strength is recorded to be Fn, the n +1 th splitting test piece splitting strength is Fn +1, the healing rate H of the test piece after healing through electromagnetic heating is defined as the ratio of Fn +1 to Fn, and when the H is equal to or less than 50% of Fn +1/Fn, the test piece is considered to be incapable of healing again, and the circulation experiment is stopped.
In the first step, the upper end of the trigger rod is in point contact with the upper box clamp, and the lower end of the trigger rod is hinged with the lower box clamp.
The heating interval Tn +1 between the two sides after the cleavage experiment is greater than Tn.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A use method of a self-healing and self-collecting clamp for an asphalt mixture test piece after splitting comprises the following steps:
the method comprises the following steps: opening an upper box clamp (1) and a lower box clamp (9) of the clamp, putting the Marshall test piece into the clamp, closing the upper box clamp (1) and the lower box clamp (9) without external force, opening the shell again, keeping the shell in an open state by using a trigger rod (4), and putting the test piece and the clamp on the splitting experiment instrument;
step two: aligning a rectangular through groove (6) on the middle frame (2) of the clamp to the pressing strip, fixing the clamp, and starting a splitting experiment;
step three: after the test piece is crushed, the trigger rod (4) is extruded, the upper point of the trigger rod (4) is in point contact and disconnected, the trigger rod (4) rotates out of the trigger rod through groove (7) and the trigger rod rotating out of the groove (8), and the clamp is closed;
step four: after the splitting experiment is finished, taking out the test piece together with the clamp, enabling the side face of the clamp to face an electromagnetic heating coil to perform an electromagnetic induction heating healing experiment, and stopping heating after the side face of the clamp is heated to the temperature t;
step five: after the heating is stopped for T1 time, the fixture is turned over, the other side surface of the fixture is heated, the fixture is continuously heated to the temperature T, the heating interval time T1 between the two side surfaces and the time required for heating the other side surface to the temperature T provide the time for the heating side surface to transfer heat to the interior of the test piece in the fourth step, so that the temperature distribution is more uniform, a certain surface of the test piece is prevented from being overheated, the steps are repeated, the effect of discontinuously heating the asphalt mixture test piece is achieved, and the fixture is turned and heated for x times until the test piece is healed;
step six: taking out the heated and healed test piece and the clamp, opening the shell, keeping the shell in an open state by using a trigger rod (4), placing the test piece and the clamp on a splitting experiment instrument, repeating the steps II, III, IV, V and VI to perform experiments for multiple times, wherein the heating interval time between two side surfaces of the second experiment performed later is T2, the heating interval time between two side surfaces of the third experiment is T3 …, recording the splitting strength of the test piece of the nth splitting experiment as Fn until the test piece cannot heal after the nth damage, recording the splitting strength of the test piece of the nth splitting experiment as Fn +1, defining the ratio of Fn +1 to Fn as the healing rate H of the test piece after the electromagnetic heating healing, considering that the test piece cannot heal again when H is equal to Fn +1/Fn and is less than or equal to 50%, and stopping the circulating experiment;
the inner side of the top of the upper box clamp (1) is hinged with a middle clamp frame (2), the top and the bottom of the middle clamp frame (2) are both provided with rectangular through grooves (6), the inner wall of the middle clamp frame (2) is fixedly connected with a heat-resistant sponge strip (10), the top of the middle clamp frame (2) is fixedly connected with a top torsion spring (3), the hinged part of the middle clamp frame (2) and the upper box clamp (1) is positioned inside the top torsion spring (3), the bottom of the middle clamp frame (2) is hinged with a lower box clamp (9), the bottom of the middle clamp frame (2) is fixedly connected with a bottom torsion spring (11), the hinged part of the middle clamp frame (2) and the lower box clamp (9) is positioned inside the bottom torsion spring (11), the inside of the lower box clamp (9) is provided with a trigger rod turning groove (8), and the inner wall of the trigger rod turning groove (8) is hinged with a trigger rod (4), and the surface of trigger bar (4) and the inside sliding connection of trigger bar roll-out groove (8), go up the inside of box clamp (1) and offer and lead to groove (7) with trigger bar (4) size assorted trigger bar, the inside fixedly connected with heat-resisting sponge (5) that the groove (7) was led to the trigger bar, and the bottom of heat-resisting sponge (5) is located the inside that the trigger bar rolled-out groove (8).
2. The use method of the self-healing and self-collecting clamp after the asphalt mixture test piece is split according to claim 1, characterized in that: in the first step, the upper end of the trigger rod (4) is in point contact with the upper box clamp (1), and the lower end of the trigger rod (4) is hinged with the lower box clamp (9).
3. The use method of the self-healing and self-collecting clamp after the asphalt mixture test piece is split according to claim 1, characterized in that: the heating interval Tn +1 between the two sides after the cleavage experiment is greater than Tn.
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| CN201910044226.4A CN109765094B (en) | 2019-01-17 | 2019-01-17 | Use method of self-healing and self-collecting clamp for split asphalt mixture test piece |
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| CN112362498B (en) * | 2020-10-27 | 2024-05-28 | 合肥工业大学 | Test method for determining optimal intermittent time of intermittent heating self-healing of steel bridge deck pavement |
| CN112362497B (en) * | 2020-10-27 | 2024-05-28 | 合肥工业大学 | Gradient self-healing rate grading and controlling method for electromagnetic induction heating asphalt pavement |
| CN113188887B (en) * | 2021-04-19 | 2024-05-10 | 杭州小曦智能科技有限公司 | Sapphire surface hardness detection device is used in wrist-watch production with protection machanism |
| CN115506205B (en) * | 2022-09-19 | 2024-07-05 | 广西北投交通养护科技集团有限公司 | Intermittent old material regeneration heating equipment and using method thereof |
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