CN109765094A

CN109765094A - A method of using a self-healing self-collecting fixture after splitting an asphalt mixture specimen

Info

Publication number: CN109765094A
Application number: CN201910044226.4A
Authority: CN
Inventors: 王芳; 秦晨阳; 闫禹佳; 芦川; 马志平; 陶明霞; 韦璐; 郝英奇; 朱鑫
Original assignee: Anhui Jianzhu University
Current assignee: Dragon Totem Technology Hefei Co ltd
Priority date: 2019-01-17
Filing date: 2019-01-17
Publication date: 2019-05-17
Anticipated expiration: 2039-01-17
Also published as: CN109765094B

Abstract

The invention discloses the application methods that fixture is collected in self-healing after a kind of splitting of bitumen mixture specimen certainly, the upper box folder of fixture and lower box folder are opened, after marshal piece is put into fixture, upper box folder and lower box folder lose external force closure, shell is opened again, shell is kept open using frizzen, by test specimen together with fixture on being placed on spilt test instrument, rectangular straight slot on frame in the middle part of fixture is directed at press strip, fixture is fixed, start spilt test, frizzen can be squeezed after test specimen is broken, disconnect frizzen top point contact, frizzen produces frizzen through slot and frizzen produces slot, the experimental method that the present invention uses passes through intermittent-heating, when avoiding progress Healing Experiments after bitumen mixture specimen cleaves, the unilateral excessively heating of bitumen mixture specimen, it is not easy to the healing of test specimen and ageing of asphalt is caused to add Speed influences the accuracy problem of Healing Experiments result data after bitumen mixture specimen splitting.

Description

Self-healing is from the application method for collecting fixture after a kind of splitting of bitumen mixture specimen

Technical field

The invention belongs to bituminous pavement property the field of test technology, and in particular to after a kind of splitting of bitumen mixture specimen from Application method of the healing from collection fixture.

Background technique

Bituminous pavement is in other factors such as reflection cracks by long-term traffic load, temperature stress and semi-rigid type base Under effect, the diseases such as crack, loose will be generated.And existing asphalt pavement conserving and rehabilitation polymer material, such as waterproofing agent drip Green regenerative agent etc. can influence maintenance costs and the use on road surface to some extent.But due to bituminous pavement has self-healing Ability can repair asphalt concrete pavement by low temperature, fatigue and base by self-healing with self-healing, bituminous pavement at normal temperature The diseases such as crack caused by layer reflection is loose, therefore the service life of asphalt concrete pavement can be improved, reduce supporting for road surface Shield and reparation, bring the benefit of economy and traffic etc..But since self-healing speed is very in its natural state for bituminous pavement Slowly, and require the ringing of external not traffic load, when the binder in asphalt in the intermittent phase by height The repair rate of pitch can improve when warm.Because asphalt concrete pavement self-healing technology is compared with the reclamation activities such as sealant, no It can be brought a negative impact to road surface is repaired, such as antiskid performance.Therefore domestic and foreign scholars have carried out bituminous pavement induction extensively and have added Thermal self-healing closes technical research, and these researchs be unable to do without a large amount of laboratory experiment, also be unable to do without simulation bituminous pavement electromagnetism certainly Incude the experimental provision of self-healing.

Grinding for electromagnetism bituminous concrete performance and induction heating apparatus is partial in the research of major part scholar at present Study carefully, the research of piece fixture is more rare when for heating.Use of most of experiment for fixture during self-healing at present It is relatively simple generally to carry out three-point bending fracture roughly with girder test specimen and test to obtain the breaking strength of girder test specimen, then will The plane of disruption fits closely together, carries out heating self-healing, carries out three-point bending fracture again after test specimen cools down at room temperature Experiment, the breaking strength after obtaining each girder test specimen healing judge healing efficiency by the breaking strength of comparison healing front and back. But due to the loss for there are building stones after girder fracture by manually splicing, plane of disruption gap can be made to increase, test specimen is hindered and be cured It closes, improves the error of experimental result, be unfavorable for the quantization of experimental result and the raising of experimental data accuracy.

After progress bitumen mixture specimen splitting at present when Healing Experiments, the unilateral excessively heating of bitumen mixture specimen, no Convenient for test specimen healing and cause ageing of asphalt to accelerate, influence bitumen mixture specimen splitting after Healing Experiments accuracy, together When, after progress bitumen mixture specimen splitting when Healing Experiments, experimenter splices test specimen, trivial operations repeatedly, and meeting is continuous Increase the difference of test specimen and original state, error increases with the increase for repeating experiment number.

Summary of the invention

The purpose of the present invention is to provide the users that fixture is collected in self-healing after a kind of splitting of bitumen mixture specimen certainly Method, when solving to carry out bitumen mixture specimen Healing Experiments using existing method, bitumen mixture specimen unilateral side overheat is unfavorable In the bitumen mixture specimen healing the problem of, and manually splice test specimen after solving bitumen mixture specimen splitting, trivial operations, and Experimental error repeats the problem of being gradually increased with experiment.

To achieve the above object, the invention provides the following technical scheme: self-healing after a kind of splitting of bitumen mixture specimen From collect fixture application method, method the following steps are included:

Step 1: the upper box of fixture folder and lower box folder are opened, after marshal piece is put into fixture, upper box folder and under Box folder loses external force closure, again opens shell, is kept open shell using frizzen, by test specimen together with folder Tool is placed on again on spilt test instrument；

Step 2: the rectangular straight slot on frame in the middle part of fixture is directed at press strip, fixture is fixed, starts spilt test；

Step 3: test specimen can squeeze frizzen after destroying, and disconnect frizzen top point contact, and frizzen produces frizzen Through slot and frizzen produce slot, fixture closure；

Step 4: after spilt test, test specimen is taken out together with fixture, by the side of fixture towards electromagnetic heating coil Electromagnetic induction heating Healing Experiments are carried out, after being heated to temperature t, stop heating；

Step 5: after stopping the heating T1 time, turnover fixture heats the another side of fixture, continues to be heated to Time needed for temperature t, the heat-up periods time T1 and heating another side to temperature t between two sides gives in step 4 Time of the heated side towards test specimen internal heat transfer, make Temperature Distribution more evenly, and test specimen one side is prevented to overheat.It is so anti- It is multiple, achieve the effect that be interrupted bitumen mixture specimen and heat, so overturning heating x times, until test specimen heals；

Step 6: test specimen and fixture after heating is healed take out, and open shell, stay open shell using frizzen State places test specimen together with fixture on spilt test instrument, repeatedly Step 2: three, four, five, six carry out many experiments, The heat-up periods time between second of the experiment two sides carried out later is T2, when third time tests the heat-up periods between two sides Between be T3 ..., until n-th destroy after until test specimen can not heal.Record n-th spilt test test specimen cleavage strength is Fn, the N+1 spilt test test specimen cleavage strength is Fn+1, and the ratio for defining Fn+1 and Fn is test specimen after electromagnetic heating heals Healing rate H thinks that test specimen can not heal again as H=Fn+1/Fn≤50%, stops circulation experiment.

Preferably, frizzen upper end and upper box folder are point contact in step 1, and lower end and lower box folder are hinged.

Preferably, the heat-up periods time Tn+1 after spilt test between two sides is greater than Tn.

Compared with the prior art, the present invention has the following beneficial effects:

(1) experimental method that the present invention uses both had solved local mistake in test specimen heating agglutination by interruption heating The problem of heat causes test specimen to damage again gives test specimen superheat section the enough time inwardly conducted heat, so that pitch mixes Expect that the Temperature Distribution in test specimen is more uniform；In turn avoid that heating temperature is excessively high or heating time too long bring healing effect is poor With energy waste problem, when avoiding progress Healing Experiments after bitumen mixture specimen cleaves, bitumen mixture specimen unilateral side mistake The problem of degree heating, is not easy to the healing of test specimen, influences Healing Experiments result data accuracy after bitumen mixture specimen cleaves.

(2) after method of the invention cooperation fixture use overcomes traditional test specimen splitting, the mold for collecting broken test specimen exists The problem of can not completing spilt test again when not demoulding after test specimen heating healing.This experimental method cooperation fixture, which has, not to be taken off Under the conditions of mould repeatedly automatically collect spilt test after test specimen clast and fragment and do not demould carry out self-healing experiment function, can The circulation of spilt test and self-healing experiment is completed when not demoulding, experimental procedure fast and easy improves conventional efficient, Saving in time costs is obvious.

Detailed description of the invention

Fig. 1 is the structural diagram of the present invention；

Fig. 2 is perspective view of the invention；

Fig. 3 is side view of the invention；

Fig. 4 is outside drawing of the invention；

Fig. 5 is press strip laying method schematic diagram of the invention；

Fig. 6 is electromagnetic heating schematic diagram of the invention.

In figure: frame in the middle part of 1- upper box folder, 2-, the top 3- torque spring, 4- frizzen, the heat-resisting sponge of 5-, 6- rectangular straight slot, 7- frizzen through slot, 8- frizzen produce box folder, the heat-resisting sponge strip of 10-, the bottom end 11- torque spring under slot, 9-.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.

Please refer to shown in Fig. 1-6, the invention provides the following technical scheme: a kind of bitumen mixture specimen splitting after electromagnetism from Fixture, including middle part frame 2 are collected in healing certainly, it is characterised in that: and the top and bottom end of middle part frame 2 offer rectangular straight slot 6, Box folder 1 is connected with by top torque spring 3 at left and right sides of the top of middle part frame 2, is passed through at left and right sides of the bottom end of middle part frame 2 Bottom end torque spring 11 is connected with lower box folder 9 corresponding with upper box folder 1, and the inside of upper box folder 1 offers frizzen through slot 7, The inside of lower box folder 9 offers frizzen and produces slot 8, and the inside that frizzen produces slot 8 is connected with frizzen 4 by shaft.

The inside of upper box folder 1 and lower box folder 9 is fitted with heat-resisting sponge 5.

Middle part frame 2 is set as rectangular box-like structure, and framework side area is greater than bituminous concrete test specimen to cross the center of circle vertical The sectional area in section, so that confining pressure will not be caused to test specimen in spilt test.

Frizzen 4 is set as lightweight hardness glue stick.

The side of upper box folder 1 and lower box folder 9 offers torque spring installation positioning circular groove.

Upper box folder 1 and lower box folder 9 are heat-resisting box body structure.

The inside of middle part frame 2, which is sticked, heat-resisting sponge strip 10.

One end of top torque spring 3 is fixed on 1 inside of box folder, and the other end of top torque spring 3 is fixed on middle part 2 inside of frame.

All components of fixture are all made of non electromagnetic induction material.

Self-healing is from the application method for collecting fixture after a kind of splitting of bitumen mixture specimen, comprising the following steps:

Step 1: pressing from both sides 1 and 9 opening of lower box folder for the upper box of fixture, after marshal piece is put into fixture, upper box folder 1 External force closure is lost with lower box folder 9, shell is opened again, is kept open shell using frizzen 4, by test specimen It is placed on spilt test instrument again together with fixture；

Step 2: the rectangular straight slot 6 on frame 2 in the middle part of fixture is directed at press strip, fixture is fixed, starts spilt test；

Step 3: test specimen can squeeze frizzen 4 after destroying, and disconnect 4 top point contact of frizzen, and frizzen 4 produces touching Hair bar through slot 7 and frizzen produce slot 8, fixture closure；

Frizzen upper end and upper box folder are point contact in step 1, and lower end and lower box folder are hinged.

Heat-up periods time Tn+1 after spilt test between two sides is greater than Tn.

It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment Intrinsic element.In the absence of more restrictions.By sentence " element limited including one ..., it is not excluded that There is also other identical elements in the process, method, article or apparatus that includes the element ".

It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding And modification, the scope of the present invention is defined by the appended.

Claims

1. A method of using a self-healing self-collecting fixture after the splitting of an asphalt mixture test piece, comprising the following steps:

Step 1: Open the upper box clip 1 and lower box clip 9 of the fixture, put the Marshall test piece into the fixture, the upper box clip 1 and the lower box clip 9 lose the external force to close, open the shell again, use the trigger lever 4 Keep the shell open, and place the specimen together with the fixture on the splitting tester;

Step 2: Align the rectangular through groove 6 on the middle frame 2 of the fixture with the pressure strip, fix the fixture, and start the splitting experiment;

Step 3: After the specimen is broken, the trigger rod 4 will be squeezed, 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 fixture is closed;

Step 4: After the splitting experiment is over, take out the test piece together with the fixture, and place the side of the fixture toward the electromagnetic heating coil to conduct an electromagnetic induction heating healing experiment. After heating to the temperature t, stop heating;

Step 5: After stopping the heating for T1 time, turn the fixture over, heat the other side of the fixture, and continue to heat to temperature t. The heating interval time T1 between the two sides and the time required to heat the other side to temperature t are given in the steps. The time that the four heating sides transfer heat to the interior of the specimen makes the temperature distribution more uniform and prevents one side of the specimen from overheating. Repeatedly, the effect of intermittent heating of the asphalt mixture specimen is achieved. until the specimen heals;

Step 6: Take out the heated and healed specimen and fixture, open the shell, use the trigger rod 4 to keep the shell open, place the specimen together with the fixture on the splitting tester, and repeat steps 2, 3, and 4. , 5 and 6, multiple experiments were carried out. In the second experiment, the heating interval between the two sides was T2, and the heating interval between the two sides in the third experiment was T3..., until the nth time after the failure of the specimen Until it fails to heal, record the splitting strength of the specimen in the nth splitting experiment as Fn, and the splitting strength of the specimen in the n+1st splitting experiment as Fn+1. The healing rate H after heating and healing, when H=Fn+1/Fn≤50%, it is considered that the specimen cannot heal again, and the cycle experiment is stopped.

2. the using method of self-healing self-collecting fixture after a kind of asphalt mixture test piece is split according to claim 1, it is characterized in that: in step 1, the upper end of trigger rod (4) and upper box clamp (1) are points Contact, the lower end of the trigger lever (4) is hinged with the lower box clamp (9).

3 . The method of using a self-healing self-collecting fixture after the splitting of the asphalt mixture test piece according to claim 1 , wherein the heating interval Tn+1 between the two sides after the splitting experiment is greater than Tn. 4 .