CN202305362U - Improved dynamic shear rheometer clamp - Google Patents
Improved dynamic shear rheometer clamp Download PDFInfo
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- CN202305362U CN202305362U CN2011204263760U CN201120426376U CN202305362U CN 202305362 U CN202305362 U CN 202305362U CN 2011204263760 U CN2011204263760 U CN 2011204263760U CN 201120426376 U CN201120426376 U CN 201120426376U CN 202305362 U CN202305362 U CN 202305362U
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Abstract
The utility model discloses an improved dynamic shear rheometer clamp which comprises an upper clamp and a lower clamp, wherein screws are arranged on the peripheries of the upper clamp and the lower clamp, the upper clamp is used for fixing an upper test piece, and the lower clamp is used for fixing a lower test piece; and an asphalt layer to be tested is placed between the upper test piece and the lower test piece and is positioned on the surface of the lower test piece, and a metal ring for preventing the asphalt layer to be tested from flowing out of the lower test piece is further stuck on the outer side of the lower test piece. The test pieces made of any mineral materials can be fixed on the clamp through the screws, so that the testing of the rheological property of an asphalt binder based on the surface of a real mineral material becomes possible. Therefore, the mineral material test pieces can be used for substituting the traditional stainless steel test pieces, and the rheological property of the asphalt binder in actual applications can be determined more accurately.
Description
Technical field
The utility model belongs to the asphalt performance testing apparatus; Relate to a kind of improvement of measuring the asphalt rheological property instrument at true mineral aggregate interface; Particularly a kind of improved dynamic shear rheometer anchor clamps; Use this improved dynamic shear rheometer (DSR) anchor clamps, in test process, also can simulate the aging performance of asphalt film simultaneously, thereby be used for confirming the ability of pitch opposing rut and fatigue etc. through test pitch rheological property on the mineral aggregate surface.
Background technology
Asphalt is the compound substance that mineral aggregate, breeze, pitch constituted by different-grain diameter.Though the mass percent of asphalt medium pitch only accounts for about 3%～6%, its performance to asphalt has material impact.Pitch belongs to typical hot-fluid sex change material; The rheological property of test asphaltic binder can characterize the opposing rut and the fatigue capability of asphalt preferably, thereby the rheological property of accurately confirming asphaltic binder is significant to the designed life of the performance design of asphalt and bituminous pavement.Traffic load on the road surface is cyclic reverse loading continuously normally, and when any point top had vehicle to pass through in the surface layer, being and becoming from pressurized and to be drawn of experience became the cyclic process of pressurized again.The mechanical response of research asphalt should adopt the dynamic load pattern, analyzes its deformation characteristic under the dynamic load effect, also is the dynamic viscous-elastic behaviour of asphalt material.Dynamic shear rheometer (DSR) is that U.S. SHRP plans also to receive very big high praise at home in the instrument that is used for trying the pitch rheological property to whole world popularization in 1993.Though dynamic shear rheometer (DSR) can be tested the rheological of pitch in the temperature of broad, frequency range; For the researchist provides than the more comprehensive pitch rheological property data of traditional index test; The clamp structure of this dynamic shear rheometer (DSR) is referring to shown in Figure 1; Comprise a pair of stainless steel survey sheet 2; Survey the tested brea bed 3 of sheet 2 these placements at stainless steel during measurement, stainless steel is surveyed sheet 2 and is placed on former machinery bed and the heating system 1, just 1mm or the thick rheological property of bituminous cements standard sample between the stainless steel anchor clamps of 2mm that it is surveyed.In bituminous concrete, mineral surface can absorb to some extent, the adsorptive pitch composition with gathering materials of closely contacting of bituminous cements, and will there be a great difference in asphalt film with its rheological at the standard stainless steel surfaces in the rheological on mineral aggregate surface.Existing asphaltic binder rheology testing method is not based on the true contact condition that characterizes pitch and mineral aggregate surface; Thereby can not accurately characterize the true rheological behaviour characteristic of asphaltic binder; Existing performance of asphalt mixture evaluation means can not accurately be simulated the true force-bearing situation of asphalt; Thereby cause the performance of asphalt accurately to estimate through laboratory experiment, also there are bigger difference in the designed life of bituminous pavement and actual behaviour in service.
Summary of the invention
Can only test the rheological property of bituminous cements standard sample between the stainless steel anchor clamps to former dynamic shear rheometer (DSR); The situation that can accurately not represent the rheological property of bituminous concrete medium pitch cementitious matter in the mineral that gather materials; The purpose of the utility model is; A kind of improved dynamic shear rheometer anchor clamps are provided, thereby can use the mineral aggregate test pieces to substitute the stainless steel test pieces, measure the rheological property of asphaltic binder in practical application more accurately.
In order to realize above-mentioned task, the utility model takes following technical solution to be achieved:
A kind of anchor clamps that improve dynamic shear rheometer is characterized in that, comprise anchor clamps and lower clamp, and last anchor clamps and lower clamp periphery have screw, and wherein, last anchor clamps are used for fixing test pieces, and lower clamp is used for fixing test pieces down;
Be used to place tested brea bed between last test pieces and the following test pieces, tested brea bed is positioned at the surface of test pieces down, and the outside of following test pieces also is pasted with and prevents that tested brea bed from flowing out the becket of test pieces down.
Adopt the anchor clamps of above-mentioned improved dynamic shear rheometer to carry out the method for the rheology testing of asphaltic binder, it is characterized in that, carry out according to the following steps:
1) screw of using anchor clamps and lower clamp periphery is fixed upward test pieces and following test pieces respectively, and tested brea bed is placed between anchor clamps and the lower clamp; And make tested brea bed be positioned at becket;
2) lower clamp is placed base and the heating system top of dynamic shear rheometer, on last anchor clamps, preheating table is installed;
3) stipulate that according to SHARP the rotating speed, amplitude and the temperature control system that regulate dynamic shear rheometer make an experiment;
4) go up that test pieces makes zero with following test pieces spacing and lifting on behind the anchor clamps, take off anchor clamps and last test pieces, directly tested brea bed is heated with this environment temperature control system, to simulate the aging behavior of pitch.
The anchor clamps of the improved dynamic shear rheometer of the utility model, the test pieces that can on anchor clamps, process any mineral material with screw is fixed, and this also just makes the rheology testing based on the asphaltic binder on true mineral aggregate surface become possibility.In addition, on the test pieces spacing makes zero also lifting up and down, behind the anchor clamps, directly the tested pitch synusia that is coated with asphalt film is carried out heat aging simulation (for keeping the air supply, going up test pieces during heating will not contact with the pitch sample) with heating system.
Description of drawings
Fig. 1 is the code test anchor clamps synoptic diagram of former dynamic shear rheometer (DSR);
Fig. 2 is through improved dynamic shear rheometer (DSR) test fixture synoptic diagram;
Fig. 3 is dynamic shear rheometer (DSR) code test anchor clamps and sense of rotation;
Fig. 4 is shear stress, strain and phase differential synoptic diagram.
Label among the figure is represented respectively: 1, former machinery bed and heating system, 2, stainless steel surveys sheet, 3, tested brea bed; 4, lower clamp, 5, go up anchor clamps, 6, screw, 7, preheating table, 8, becket, 9, go up test pieces, 10, test pieces down.
Below in conjunction with accompanying drawing and embodiment the utility model is done further to specify.
Embodiment
Referring to Fig. 2, present embodiment provides a kind of anchor clamps of improved dynamic shear rheometer, comprises anchor clamps 5 and lower clamp 4, and last anchor clamps 5 have screw 6 with lower clamp 4 peripheries, and wherein, last anchor clamps 5 are used for fixing test pieces 10, and lower clamp 4 is used for fixing test pieces 9 down;
Be used to place tested brea bed 3 between last test pieces 10 and the following test pieces 9, tested brea bed 3 is positioned at the surface of test pieces 9 down, and the outside of following test pieces 9 also is pasted with and prevents that tested brea bed 3 from flowing out the becket 8 of test pieces 9 down.
In the present embodiment, the shape of last anchor clamps 5 and lower clamp 4 is identical and diameter is different.Therefore go up test pieces 10 and also diameter difference identical with following test pieces 9 shapes.
Above-mentioned last test pieces 10 can be processed by any mineral material with following test pieces 9; Therefore the test pieces that the dynamic shearing appearance of transforming can be processed any mineral material with screw on anchor clamps is fixed, and this also just makes the rheology testing based on the asphaltic binder on true mineral aggregate surface become possibility.
Adopt the anchor clamps of above-mentioned improved dynamic shear rheometer to carry out the method for the rheology testing of asphaltic binder, carry out according to the following steps:
1) screw 6 of using anchor clamps 5 and lower clamp 4 peripheries is fixed upward test pieces 10 and following test pieces 9 respectively, and tested brea bed 3 is placed between anchor clamps 5 and the lower clamp 4; And make tested brea bed 3 be positioned at becket 8;
2) lower clamp 4 is placed the base and heating system 1 top of dynamic shear rheometer, preheating table 7 is installed on last anchor clamps 5;
3) stipulate that according to SHARP the rotating speed, amplitude and the temperature control system that regulate dynamic shear rheometer make an experiment;
4) going up test pieces 10 and following test pieces 9 spacings makes zero in the also lifting behind the anchor clamps 5; Take off anchor clamps 5 and last test pieces 10; Directly tested brea bed 3 is heated with this environment temperature control system; Aging behavior (in heating process, keep the supply of hot-air, going up test pieces simultaneously will not contact with the pitch sample) with simulation pitch.
The DSR machine models that present embodiment adopted is Bohlin CVOR-150, and its temperature-control range is-20 ℃ to 180 ℃.
Rotating speed and amplitude: in the range of speeds of 0.0628rad/s～150rad/s, can regulate voluntarily according to different compounds; Also can regulate amplitude voluntarily with the adequacy test requirement for different compounds, perhaps good rotating speed and the amplitude of adjusted according to the SHARP regulation makes an experiment.
Temperature control: temperature-control range is 3 ℃～88 ℃, can be adjusted to different temperature according to the difference of survey asphalt and make an experiment.
Under test temperature or the expectation test temperature scope intermediate value; Set up the zero stand-off level through manual rotation test plate; Rotation rotatable plate (Fig. 3) reduces the gap and contacts fixed head until rotor plate, or to having the flow graph of conventional force transducer; Reduce the gap and contact really, confirm as the zero stand-off at zero normal force place roughly until two plates.Preheating table 7 is in order to promote cohering of asphalt and plate.In order to make bituminous cements and breadboard obtain enough cohering, breadboard must preheating.Preheating is particular importance concerning making an experiment; When directly pouring into a mould; When preheating table 7 one touches asphalt, the asphalt heat has improved and has cohered, and the preheat temperature of suitably cohering depends on the grade of asphalt and the temperature of character and test (thickness of preheating table 7 is 8mm or 25mm); For some thicker asphalt, be preheating to 46 ℃ and possibly also be not enough to guarantee suitably cohering of bituminous cements and breadboard.
When carrying out temperature scanning, begin to increase or reduce test temperature from the mid point of test temperature, to reach the test temperature scope of hope.Temperature controller is set to required test temperature.Temperature displayed reaches the temperature of hope, and temperature is remained on temperature required ± 0.1 ℃ is located, and could begin behind the 10min at least to make an experiment
The job operation of mineral aggregate test pieces (tested brea bed 3): mineral aggregate test pieces job sequence is: at first (go up test pieces 25mm according to the diameter of design test sheet; Following test pieces 35mm) mineral aggregate of basketball size is got core; Then core is carried out dicing; Because existing equipment can only cut the thinnest for the mineral aggregate sheet about 7mm and be difficult to guarantee that top and bottom are parallel, will polish processing to cutting gained test pieces, make its thickness reach 4mm and top and bottom are parallel.In order to guarantee the consistent of test pieces and pitch surface of contact quality and on-the-spot mineral aggregate surface; To carry out the rubber polishing once more to mineral aggregate built-in testing face; Make its roughness and on-the-spot mineral aggregate face mean roughness similar, surfaceness laser testing appearance will be used to test surfaces and mineral aggregate surface roughness are compared.So both guarantee the accuracy of DSR test, guaranteed the quality natural sex of test pieces mineral aggregate face again.
The simulation aging test: can make earlier asphalt externally condition be issued to ageing state, and then move on the DSR experimental apparatus and test.
Claims (4)
1. the anchor clamps of an improved dynamic shear rheometer is characterized in that, comprise anchor clamps (5) and lower clamp (4); Last anchor clamps (5) and lower clamp (4) periphery have screw (6); Wherein, last anchor clamps (5) are used for fixing test pieces (10), and lower clamp (4) is used for fixing test pieces (9) down;
Be used to place tested brea bed (3) between last test pieces (10) and the following test pieces (9), tested brea bed (3) is positioned at the surface of test pieces (9) down, and the outside of following test pieces (9) also is pasted with and prevents that tested brea bed (3) from flowing out the becket (8) of test pieces (9) down.
2. the anchor clamps of improved dynamic shear rheometer as claimed in claim 1 is characterized in that, described upward test pieces (10) and following test pieces (9) are processed by any mineral material.
3. the anchor clamps of improved dynamic shear rheometer as claimed in claim 1 is characterized in that, the described shape that goes up anchor clamps (5) and lower clamp (4) is identical and diameter is different.
4. the anchor clamps of improved dynamic shear rheometer as claimed in claim 1 is characterized in that, describedly go up test pieces (10) and following test pieces (9) shape is identical and diameter is different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204263760U CN202305362U (en) | 2011-11-01 | 2011-11-01 | Improved dynamic shear rheometer clamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204263760U CN202305362U (en) | 2011-11-01 | 2011-11-01 | Improved dynamic shear rheometer clamp |
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| CN202305362U true CN202305362U (en) | 2012-07-04 |
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| CN2011204263760U Expired - Fee Related CN202305362U (en) | 2011-11-01 | 2011-11-01 | Improved dynamic shear rheometer clamp |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507378A (en) * | 2011-11-01 | 2012-06-20 | 长安大学 | Improved dynamic shear rheometer fixture and testing method |
| CN116223248A (en) * | 2022-12-09 | 2023-06-06 | 中材科技风电叶片股份有限公司 | Tool and method for testing interfacial shear of blade root embedded metal sleeve and composite material |
-
2011
- 2011-11-01 CN CN2011204263760U patent/CN202305362U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507378A (en) * | 2011-11-01 | 2012-06-20 | 长安大学 | Improved dynamic shear rheometer fixture and testing method |
| CN116223248A (en) * | 2022-12-09 | 2023-06-06 | 中材科技风电叶片股份有限公司 | Tool and method for testing interfacial shear of blade root embedded metal sleeve and composite material |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20141101 |
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| EXPY | Termination of patent right or utility model |