CN202066809U - Tester for linear contraction coefficient of asphalt mixture - Google Patents
Tester for linear contraction coefficient of asphalt mixture Download PDFInfo
- Publication number
- CN202066809U CN202066809U CN2011201178145U CN201120117814U CN202066809U CN 202066809 U CN202066809 U CN 202066809U CN 2011201178145 U CN2011201178145 U CN 2011201178145U CN 201120117814 U CN201120117814 U CN 201120117814U CN 202066809 U CN202066809 U CN 202066809U
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- displacement
- displacement transducer
- asphalt
- test instrument
- display device
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Abstract
The utility model discloses a tester for linear contraction coefficient of asphalt mixture. The tester comprises an upper frame and a lower frame, displacement sensors, invar rods and a displacement display device, wherein the upper frame and the lower frame are arranged in parallel and are used for fixing a test piece; the displacement sensors are fixed on the upper frame; the invar rods are arranged on the lower frame; the end parts of the displacement sensors are in contact with the invar rods; and the displacement display device is in signal connection with the displacement sensors and is used for displaying displacement data of the displacement sensors. The tester has the advantages that the operation is simple, and the results are reliable.
Description
Technical field
The utility model relates to a kind of asphalt linear contractive quotiety test instrument, belongs to the road engineering special purpose test equipment.
Background technology
Asphalt is a kind of temperature-sensitive material, and variation of temperature can make its mechanical property change a lot.Along with the reduction of temperature, the intensity of asphalt and stiffness all can obviously increase, and simultaneously, deformability also can significantly descend, and under the reloading and temperature stress effect of vehicle, cold cracking can take place bituminous pavement.Linear contractive quotiety is an important indicator of estimating the asphalt crack resistance at low-temperature, and it is closely related with the temperature shrinkage cracking of bituminous pavement, also is the important parameter of calculating bituminous pavement temperature stress.
The existing standard method of testing is the asphalt linear contractive quotiety test (T0720) of transportation industry " pitch and asphalt testing regulations " in (JTJ052-2000), adopts clock gauge to carry out the test of asphalt linear contractive quotiety.The weak point of this method is: the clock gauge precision is relatively poor, and reading error is big and reading is inconvenient.
Summary of the invention
For addressing the above problem, the purpose of this utility model is to provide a kind of asphalt linear contractive quotiety test instrument, to realize the accurate measurement of linear contractive quotiety.
For achieving the above object, asphalt linear contractive quotiety test instrument provided by the utility model is characterized in that described test instrument comprises:
The upper ledge that is used for fixing test specimen and the lower frame that are arranged in parallel;
Be fixed on the displacement transducer on the described upper ledge;
Be fixed on the invar rod on the described lower frame, the end of described displacement transducer contacts with the invar rod; And
The displacement display device that is connected with described displacement transducer signal.
Preferably, described displacement transducer is vertical with described upper ledge.
During use, test specimen is fixed between upper ledge and the lower frame, then test instrument is fixed in the high and low temperature environment case, display device is connected with signal wire with two displacement transducers and is placed on outside the high and low temperature environment case.The temperature that is provided with earlier in the high and low temperature environment case is first temperature, and insulation a period of time, is cooled to second temperature then, is incubated a period of time again, writes down the displacement numerical value that shows on the display device at last.
Shown displacement numerical value just bitumen mixture specimen can be accurate to 0.001mm owing to the stroke that temperature variation produces.Bitumen mixture specimen is flexible owing to temperature variation can produce, and the test specimen length between the initial upper and lower frames is L
0(mm) (can be called effective test specimen length), become L after stretching
e(mm).Because lower frame and invar rod, test specimen are fixed, upper ledge and displacement transducer, test specimen are fixed, the displacement transducer termination closely contacts with the invar rod, there is spring the sensor the inside, can stretch in the sensor termination, the stroke that test specimen produces can only cause that the displacement transducer termination is flexible thereupon, thereby can write down the stroke of generation.
Preferably, described displacement transducer comprises first displacement transducer and second displacement transducer, and described first displacement transducer and second displacement transducer are separately fixed at the two ends of described upper ledge and are arranged in parallel; Described invar rod comprises first invar rod and the second invar rod, and described first invar rod and the second invar rod are separately fixed at the two ends of described lower frame, and the end of described two displacement transducers contacts with the end of described two invar rods respectively.Further preferred, described displacement display device comprises the first displacement display device and the second displacement display device, the described first displacement display device is connected the displacement data that is used to show first displacement transducer with described first displacement transducer signal, and the described second displacement display device is connected the displacement data that is used to show second displacement transducer with described second displacement transducer signal.The stroke that test specimen produces is the mean value of two displacement datas, thereby can improve the precision of test.
Preferably, the two ends of described upper ledge respectively have a circular hole, and two displacement transducers are respectively by described circular hole and be fixed on the upper ledge.
Preferably, test instrument of the present invention also comprises fixed head, and described fixed head is fixedlyed connected with lower frame.During use by fixed head is fixed in the high and low temperature environment case, thereby realize the fixing of whole test instrument.For example, can be provided with center in fixed head central authorities, center links to each other by bolt with the post that connects in the high and low temperature environment case, thereby test instrument is fixed in the high and low temperature environment case.
The advantage of asphalt linear contractive quotiety test instrument described in the utility model is that test operation is simple and easy, reliable results.
Below in conjunction with drawings and Examples the utility model is further described.
Description of drawings
Fig. 1 is the synoptic diagram according to the test instrument of an embodiment of the present utility model;
Embodiment
As shown in Figure 1, test specimen 1 is fixed between the upper ledge 2 and lower frame 3 that is parallel to each other, first displacement transducer 4 and second displacement transducer 5 are separately fixed on the upper ledge 2, first invar rod, the 6 and second invar rod 7 is separately fixed on the lower frame 3, the end of first displacement transducer 4 contacts with the first end of the first invar rod 6, and the end of second displacement transducer 5 contacts with the first end of the second invar rod 7.Be parallel to each other between described first displacement transducer 4 and second displacement transducer 5 and vertical with upper ledge 2.The described first invar rod 6 extends through described lower frame towards the direction opposite with the first end of the described first invar rod 6, thereby form the extension of the first invar rod 6, the described second invar rod 7 extends through described lower frame towards the direction opposite with the first end of the described second invar rod 7, thereby forms the extension of the second invar rod 7.Fixed base plate 8 passes through to fixedly connected with the extension of the described second invar rod 7 with the extension of the described first invar rod 6 respectively, thereby realizes being fixed on the lower frame 3.Described fixed base plate is provided with center 9.Center 9 is used for being connected with the column bolt that connects of high and low temperature environment case, with fixing whole test instrument.
The method of operating of the described pavement asphalt compound of present embodiment linear contractive quotiety test instrument can be as follows:
1 is fixed on test specimen in the upper and lower outer frame, and tightening plan range up and down is L
0Mm (the tested length of test specimen).
2 sensors fixedly finish, can be fixed on the bolt of fixed mount base plate center in the high and low temperature environment case with instrument and connect on the post, in last sliding door, stretch out signal wire, displacement display device (not shown) is placed outside the high and low temperature environment case (not shown).
3 instruments fixedly finish, and close to close sliding door and high and low temperature environment case master door, start temperature control system.
4 reach the test initial point when (as 10 ℃) when high and low temperature environment the temperature inside the box, should be incubated a period of time, allow arrive this temperature fully inside and outside the test specimen, are incubated a period of time equally.
5 continue cooling and probe temperature (as: 20 ℃), are incubated a period of time equally.
6 record two display numerical value (averaging) are accurate to 0.001mm.
Average shrinkage coefficient between 7 cooldown periods calculates by formula (1).
The average line contraction coefficient of C---asphalt;
L
e---the length after test specimen shrinks, mm;
L
0---the original length of test specimen, mm;
Δ T---temperature range, the difference from initial temperature to finishing temperature.
Claims (7)
1. asphalt linear contractive quotiety test instrument is characterized in that described test instrument comprises:
The upper ledge that is used for fixing test specimen and the lower frame that are arranged in parallel;
Be fixed on the displacement transducer on the described upper ledge;
Be fixed on the invar rod on the described lower frame, the end of described displacement transducer contacts with the invar rod; And
Being used to of being connected with described displacement transducer signal shows the displacement display device of the displacement data of displacement transducer.
2. asphalt linear contractive quotiety test instrument according to claim 1 is characterized in that described displacement transducer and described upper ledge are perpendicular.
3. asphalt linear contractive quotiety test instrument according to claim 1 and 2, it is characterized in that, described displacement transducer comprises first displacement transducer and second displacement transducer, and described first displacement transducer and second displacement transducer are separately fixed at the two ends of described upper ledge and are arranged in parallel; Described invar rod comprises first invar rod and the second invar rod, and described first invar rod and the second invar rod are separately fixed at the two ends of described lower frame, and the end of described two displacement transducers contacts with the end of described two invar rods respectively.
4. asphalt linear contractive quotiety test instrument according to claim 3, it is characterized in that, described displacement display device comprises the first displacement display device and the second displacement display device, the described first displacement display device is connected the displacement data that is used to show first displacement transducer with described first displacement transducer signal, and the described second displacement display device is connected the displacement data that is used to show second displacement transducer with described second displacement transducer signal.
5. asphalt linear contractive quotiety test instrument according to claim 3 is characterized in that the two ends of described upper ledge respectively have a circular hole, and described first displacement transducer and second displacement transducer are respectively by described circular hole and be fixed on the upper ledge.
6. asphalt linear contractive quotiety test instrument according to claim 1 is characterized in that, described asphalt linear contractive quotiety test instrument also comprises fixed head, and described fixed head is fixedlyed connected with lower frame.
7. asphalt linear contractive quotiety test instrument according to claim 6 is characterized in that the central authorities of described fixed head are provided with center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201178145U CN202066809U (en) | 2011-04-20 | 2011-04-20 | Tester for linear contraction coefficient of asphalt mixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201178145U CN202066809U (en) | 2011-04-20 | 2011-04-20 | Tester for linear contraction coefficient of asphalt mixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202066809U true CN202066809U (en) | 2011-12-07 |
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ID=45060669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201178145U Expired - Fee Related CN202066809U (en) | 2011-04-20 | 2011-04-20 | Tester for linear contraction coefficient of asphalt mixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202066809U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107290090A (en) * | 2017-08-21 | 2017-10-24 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of concrete freezes planted agent's force test device |
| CN109856360A (en) * | 2018-12-31 | 2019-06-07 | 武汉新锐合金工具有限公司 | A kind of test method measuring mixture linear contractive quotiety |
| CN114002261A (en) * | 2021-11-29 | 2022-02-01 | 广西交科集团有限公司 | Asphalt mixture linear shrinkage coefficient measuring device and using method thereof |
-
2011
- 2011-04-20 CN CN2011201178145U patent/CN202066809U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107290090A (en) * | 2017-08-21 | 2017-10-24 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of concrete freezes planted agent's force test device |
| CN107290090B (en) * | 2017-08-21 | 2023-11-10 | 水利部交通运输部国家能源局南京水利科学研究院 | Concrete freezing internal stress testing device |
| CN109856360A (en) * | 2018-12-31 | 2019-06-07 | 武汉新锐合金工具有限公司 | A kind of test method measuring mixture linear contractive quotiety |
| CN114002261A (en) * | 2021-11-29 | 2022-02-01 | 广西交科集团有限公司 | Asphalt mixture linear shrinkage coefficient measuring device and using method thereof |
| CN114002261B (en) * | 2021-11-29 | 2024-02-20 | 广西交科集团有限公司 | Asphalt mixture line shrinkage coefficient measuring device and using method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111207 Termination date: 20160420 |