CN210090213U - Improved dynamic shear rheometer parallel plate - Google Patents
Improved dynamic shear rheometer parallel plate Download PDFInfo
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- CN210090213U CN210090213U CN201920578632.4U CN201920578632U CN210090213U CN 210090213 U CN210090213 U CN 210090213U CN 201920578632 U CN201920578632 U CN 201920578632U CN 210090213 U CN210090213 U CN 210090213U
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Abstract
The utility model discloses an improved dynamic shear rheometer parallel plate, which comprises an upper parallel plate and a lower parallel plate, wherein the upper parallel plate comprises a bottom platform and a first handle, and the lower parallel plate comprises a second handle, a top platform, a boss and a sleeve; the lower surface of the top platform is fixedly connected with a second handle, and the upper surface of the top platform is fixedly connected with a boss; the edge of the periphery of the upper surface of the top platform is detachably connected with an upright sleeve; the top of the boss is correspondingly provided with a bottom platform, and the upper surface of the bottom platform is fixedly connected with a first handle; the sample to be tested is placed between the boss and the bottom platform; the first handle and the second handle are both connected with the dynamic shear rheometer in an installing mode. The improved dynamic shear rheometer parallel plate can quantitatively test the rheological property of asphalt or mucilage in a real mineral aggregate surface contact state under the water condition, so that the quantitative evaluation of the water damage resistance of different types of asphalt or mucilage based on the asphalt shear rheometer becomes possible.
Description
Technical Field
The utility model belongs to pitch capability test equipment relates to a modified developments shearing rheometer parallel plate.
Background
The water damage of asphalt pavement is one of the main forms of the asphalt pavement damage, and according to the existing research, the water damage of the asphalt pavement is one of the key factors causing the early-stage damage of the pavement, and the water damage problem is closely related to the pavement performance of the pavement, so that the water damage problem is increasingly worldwide in recent years. The current forms of damage to water are mainly classified into three types: cohesive failure, adhesive failure, and cohesive-adhesive composite failure. Adhesion failure refers to failure of adhesion at a weak interface between the asphalt and aggregate, and cohesive failure refers to failure of cracking due to a decrease in cohesion within the asphalt or asphalt cement. Aiming at the problem of water damage, different scholars carry out intensive research based on different theoretical methods (fracture mechanics, damage mechanics and the like) and different scales (macroscopic, microscopic and even nanoscopic), a lot of achievements are formed, and corresponding specifications are brought into home and abroad aiming at the evaluation representation of the adhesion of asphalt and aggregate and the anti-stripping capability of asphalt. Therefore, the method for evaluating the water damage resistance of the asphalt or the asphalt cement has important significance and value.
Although the mass percentage of the asphalt in the asphalt mixture is only about 3-6%, the quality of the rheological property of the asphalt as a typical thermal rheological material can obviously affect the high-low temperature performance and the fatigue performance of the asphalt mixture, which has become a consensus in the road industry. The process of the action of the traffic load on the road to the road surface is represented as a cyclic process of pressing, then pulling and then pressing the road, so that the deformation characteristics of the asphalt and the mixture thereof under the action of dynamic load are researched by adopting a dynamic loading mode, and the analysis of the dynamic mechanical response behavior of the asphalt and the mixture thereof has important practical significance. Under the background, scholars at home and abroad use a Dynamic Shear Rheometer (DSR) as an analytical instrument for the dynamic rheological properties of the asphalt and the mixture thereof to research the dynamic mechanical properties of the asphalt and the mixture thereof. Based on DSR, rheological data for bitumen can be obtained over a wide range of temperatures and frequencies, enabling a more comprehensive analysis of the rheological properties of bitumen than conventional bitumen indicators.
However, the current mainstream shear rheometers default to measuring the rheological properties of asphalt in a conventional state, and specific embodiments are as follows: placing the poured asphalt sample between an upper clamp and a lower clamp, heating to soften the asphalt, and controlling the distance between the upper clamp and the lower clamp to a proper position to form a sandwich structure to finish the test of the rheological property of the middle asphalt layer. Obviously, based on DSR equipment, the rheological property of asphalt or asphalt cement under unconventional test conditions (water, even saline water environment and real mineral aggregate surface contact state) is explored, so that on one hand, the application potential of the DSR equipment can be further explored, and on the other hand, a new quantitative analysis evaluation method and a new quantitative analysis evaluation approach are provided for exploring the failure mechanism of asphalt and cement adhesion damage and cohesive damage.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a modified developments shear rheometer parallel plate to under can simulating the water condition, the dynamic rheological behavior of pitch and pitch mucilage during true mineral aggregate contact state provides new analysis and evaluation way for the water damage resistance ability of sign pitch and mucilage.
To achieve the above object, the technical solution of the present invention is as follows.
An improved dynamic shear rheometer parallel plate comprising an upper parallel plate comprising a bottom platform and a first handle, and a lower parallel plate comprising a second handle, a top platform, a boss, and a sleeve; the lower surface of the top platform is fixedly connected with a second handle, and the upper surface of the top platform is fixedly connected with a boss; the periphery of the upper surface of the top platform is detachably connected with an upright sleeve to form a groove capable of containing liquid, a sealing structure is formed, the sleeve forms the side surface of the groove, and the top platform forms the bottom surface of the groove; the top of the boss is correspondingly provided with a bottom platform of the upper parallel plate, and the upper surface of the bottom platform is fixedly connected with a first handle; the top platform, the second handle, the boss, the bottom platform and the first handle are coaxially arranged; the sample to be tested is placed between the boss and the bottom platform; the first handle and the second handle are both connected with the dynamic shear rheometer in an installing mode.
Preferably, bottom platform, top platform, boss and sleeve are circular, and the diameter of bottom platform and boss is the same, and the diameter is 5~40 mm.
Preferably, the diameter of the bottom platform is 25mm or 8 mm.
Preferably, the edge all around of top platform upper surface is connected through mortise and tenon structure with the sleeve.
Preferably, the first handle and the second handle are in a dumbbell structure with the middle diameter smaller than the diameters of the two ends, so that the first handle and the second handle can be installed on the dynamic shear rheometer and fixed; the first handle and the second handle are connected with the dynamic shear rheometer in an installing mode through screw clamping.
Preferably, the upper parallel plate and the lower parallel plate are made of metal materials, and the metal materials have stable physical and chemical properties and certain hardness at the temperature of-20-500 ℃ and do not generate physical and chemical reactions with salt solutions.
Preferably, the thicknesses of the bottom platform, the top platform and the lug boss are all 1 mm-10 mm.
Preferably, the boss, top platform and second handle are integrally formed; the bottom platform and the first handle are integrally formed.
A method for testing the rheological property of asphalt or asphalt cement by using the improved dynamic shear rheometer parallel plate comprises the following steps:
1) selecting an upper parallel plate and a lower parallel plate with corresponding specifications according to the test purpose and requirements, assembling a sleeve on a top platform, fixing a second handle above a base and a heating system of the dynamic shear rheometer in a clamping manner through screws, and fixing a first handle on a loop bar of the dynamic shear rheometer in a clamping manner through screws;
2) completing the selection of the specification of the parallel plate, the correction of the system and the zeroing of the gap between the upper parallel plate and the lower parallel plate;
3) adjusting a control mode, a test target temperature, a frequency and a test time according to the test purpose or the regulations of road engineering asphalt and asphalt mixture test regulation JTG E20-2011, the petrochemical industry standard SH/T0777-2005 of the people's republic of China and the standard AASHTOT315-09 of the American Association of road traffic authorities;
4) placing a pre-poured asphalt or asphalt mortar sample on the upper surface of the boss, heating the upper parallel plate and the lower parallel plate by using a heating device of a dynamic shear rheometer to ensure that the temperature of the upper parallel plate and the lower parallel plate is raised to a temperature T which is not less than 46 ℃, adjusting the distance between the upper parallel plate and the lower parallel plate after the asphalt or asphalt mortar sample is heated and softened, removing asphalt extruded by the upper parallel plate and the lower parallel plate, cooling or raising the temperature of the asphalt or asphalt mortar sample to a test target temperature by using a cooling system or a heating system, and keeping the temperature at the test target temperature for 15-60 min;
5) adding water or salt solution which is already at the test target temperature into the groove, wherein the height of the added water or salt solution in the groove is between the upper surface of the asphalt or asphalt cement sample and the upper surface of the bottom platform, and then keeping the temperature for a plurality of times at the test target temperature according to the test purpose;
6) dynamic rheology tests were performed.
Preferably, pre-prepared cylindrical mineral aggregates are respectively fixed on the lower surface of the bottom platform and the upper surface of the boss, and the cylindrical mineral aggregates comprise an upper target mineral aggregate fixed on the lower surface of the bottom platform and a lower target mineral aggregate fixed on the upper surface of the boss; the cylindrical mineral aggregate, the bottom platform and the boss are coaxially arranged, and a pre-poured asphalt or asphalt cement sample is placed on the upper surface of the lower target mineral aggregate.
Preferably, the cylindrical mineral aggregate is fixedly bonded with the lower surface of the bottom platform and the upper surface of the boss through glue.
Preferably, the height of the added water or salt solution in the groove is the upper surface of the upper target mineral aggregate.
Preferably, the dynamic shear rheometer is an AR-2000 rheometer manufactured by TA.
Preferably, the test target temperature of the dynamic shear rheometer is adjusted to be 5 ℃ to 85 ℃.
Preferably, the test target temperature of the dynamic shear rheometer is adjusted to be-20-150 ℃.
Preferably, the frequency of the dynamic shear rheometer is adjusted to be 7.5E-7 to 628 rad/s.
Compared with the prior art, the utility model has the following beneficial effect and advantage:
the utility model discloses modified developments shearing rheometer parallel plate goes up the parallel plate and all can bond the mineral aggregate with lower parallel plate, under the testable anhydrous condition when not external sleeve, based on the rheology behavior of the pitch or the pitch mucilage glue on true mineral aggregate surface. After the sleeve is externally connected, the dynamic rheological property of the asphalt or asphalt cement sample can be tested when water (or salt solution) is diffused in asphalt or cement, and the performance attenuation condition of the asphalt or asphalt cement sample due to water damage (cohesive damage and adhesive damage) can be analyzed by comparing the dynamic rheological property data of the sample in an anhydrous state. Therefore, the utility model provides an improve dynamic shear rheometer parallel plate provides a quantitative analysis pitch or asphalt mastic sample's a way of water damage resistance, possesses certain using value.
Drawings
FIG. 1 is a schematic diagram of an upper parallel plate provided by the present invention;
FIG. 2 is a schematic view of a lower parallel plate provided by the present invention;
FIG. 3 is a schematic view of parallel plates simulating mineral asphalt contact and water environment provided by the present invention;
FIG. 4 is a Dynamic Shear Rheometer (DSR) standard test fixture and rotation direction;
FIG. 5 is a schematic diagram of shear stress (strain) and phase difference.
The reference numerals in the drawings denote: 1. bottom platform, 201, first handle, 202, second handle, 3, top platform, 4, boss, 5, sleeve, 6, upper portion target mineral aggregate, 7, lower part target mineral aggregate, 8, the sample that awaits measuring, 9, water or salt solution, 10, go up the metal sheet, 11, lower metal sheet.
The present invention will be described in further detail with reference to the following drawings and examples.
Detailed Description
As shown in fig. 1, 2 and 3, the present embodiment provides an improved dynamic shear rheometer parallel plate, comprising an upper parallel plate comprising a bottom platform 1 and a first handle 201, and a lower parallel plate comprising a second handle 202, a top platform 3, a boss 4 and a sleeve 5; the lower surface of the top platform 3 is fixedly connected with a second handle 202, and the upper surface of the top platform 3 is fixedly connected with a boss 4; the peripheral edges of the upper surface of the top platform 3 are detachably connected with upright sleeves 5 to form a groove capable of containing liquid, the sleeves 5 form the side surfaces of the groove, and the top platform 3 forms the bottom surface of the groove; the top of the boss 4 is correspondingly provided with a bottom platform 1 of an upper parallel plate, and the upper surface of the bottom platform 1 is fixedly connected with a first handle 201; the top platform 3, the second handle 202, the boss 4, the bottom platform 1 and the first handle 201 are coaxially arranged; the asphalt sample 8 is placed between the boss 4 and the bottom platform 1; the first handle 201 and the second handle 202 are both connected with the dynamic shear rheometer. Bottom platform 1, top platform 3, boss 4 and sleeve 5 are circular, and bottom platform 1 is the same with boss 4's diameter, and the diameter is 25mm, and the edge all around of 3 upper surfaces of top platform is connected through tenon fourth of twelve earthly branches structure with sleeve 5, and the edge all around of 3 upper surfaces of top platform has the tenon structure, and 5 bottoms of sleeve have the fourth of twelve earthly branches structure. The first handle 201 and the second handle 202 are dumbbell structures with the middle diameter smaller than the diameters of the two ends, so that the handles can be mounted on the dynamic shear rheometer and fixed by being clamped and fixed through screws. The boss 4, the top platform 3 and the second handle 202 are integrally formed; the bottom platform 1 and the first handle 201 are integrally formed.
The embodiment also provides a method for performing the rheological property test of asphalt by using the improved dynamic shear rheometer parallel plate, which comprises the following steps:
1) an asphalt time sweep test was performed with a test target temperature of 40 c, and a bottom platform 1 and a boss 4 with a diameter of 25mm were selected. Assembling a sleeve 5 on the top platform 3, fixing the second handle 202 above a base and a heating system of the dynamic shear rheometer in a clamping manner through screws, and fixing the first handle 201 on a loop bar of the dynamic shear rheometer in a clamping manner through screws; fixing pre-prepared cylindrical mineral aggregates on the lower surface of the bottom platform 1 and the upper surface of the boss 4 through high-strength glue respectively, wherein the cylindrical mineral aggregates comprise an upper target mineral aggregate 6 fixed on the lower surface of the bottom platform 1 and a lower target mineral aggregate 7 fixed on the upper surface of the boss 4; the cylindrical mineral aggregate, the bottom platform 1 and the boss 4 are coaxially arranged; wherein the diameter of the bottom platform 1 is the same as that of the boss 4, and the diameter is 25 mm.
2) The DSR control software completes the specification selection of the parallel plates, the system correction and the zero resetting of the gap between the upper parallel plate and the lower parallel plate;
3) in the DSR machine model adopted in this embodiment, the AR-2000 rheometer manufactured by TA corporation, according to the purpose of experimental study, the distance between the upper target mineral aggregate 6 and the lower target mineral aggregate 7 is adjusted to 1mm, the test mode is adjusted to time sweep, the frequency is set to 10HZ, the stress control mode is set to 30kpa, the test duration is 2h, and the sampling time interval is 10 s.
4) Placing a pre-poured asphalt sample 8 on the upper surface of the lower target mineral aggregate 7, heating the upper parallel plate and the lower parallel plate to 60 ℃ by using a heating device of a dynamic shear rheometer, heating the parallel plates to drive the cylindrical mineral aggregate and the asphalt sample 8 to be heated, adjusting the distance between the upper target mineral aggregate 6 and the lower target mineral aggregate 7 after the asphalt sample 8 is softened, removing asphalt extruded by the upper target mineral aggregate 6 and the lower target mineral aggregate 7, naturally cooling the asphalt sample 8 to 40 ℃, and preserving heat for 15min at a target temperature of 40 ℃;
5) adding water which is already at 40 ℃ into the groove, wherein the height of the added water in the groove is the upper surface of the upper target mineral aggregate 6, and preserving the heat at 40 ℃ for 1h, wherein the water is subjected to infiltration diffusion in the asphalt in the time;
6) and in addition, a contrast test is carried out by only changing the water-bearing condition into the water-free condition and keeping other parameters unchanged, and the attenuation condition of the rheological property of the asphalt under the water environment can be obtained by comparing two groups of test results, so that the fatigue damage condition under the asphalt water damage can be quantitatively analyzed.
DSR test principle As shown in FIGS. 4 and 5, DSR can apply sine alternating shearing stress to test the viscoelastic behavior of a material, wherein a phase angle delta is a lag angle between strain and stress of the material, the phase angles of an ideal elastic material and an ideal viscous material are 0 degrees and 90 degrees respectively, and the phase angle of the viscoelastic material is between 0 degrees and 90 degrees. Through heating sample and metal sheet interval adjustment, the sample that awaits measuring forms sandwich structure with last metal sheet 10, lower metal sheet 11, and the instrument provides the moment of torsion and drives metal sheet 10 and rotate, and lower metal sheet then is fixed in on the base of instrument, realizes the rheological properties test to the pitch sample through the dynamic shear load of applying.
The processing method of the upper target mineral aggregate 6 and the lower target mineral aggregate 7 is as follows: the parallel plates with corresponding specifications are selected according to test requirements, the diameter of a blocky stone cylinder is determined according to the specifications of the parallel plates, the core of the blocky stone is drilled, a cutting machine is used for cutting a core into sheets, and the thickness of the rock is recommended to be selected in an integer range of 3-6 mm. In addition, because the surface roughness of the tested mineral aggregate is similar to that of the unprocessed mineral aggregate as much as possible, the roughness detection can adopt laser test equipment or other microscopic texture detection equipment, and the cut mineral aggregate needs to be polished by sand paper with proper mesh number when the roughness is changed. The method ensures the rationality and accuracy of the DSR test.
The time length of the soaking process of the sample to be tested under the water condition can be selected according to the test purpose.
The utility model provides a pair of rheometer parallel plate is cuted to modified developments, but the dynamic rheological behavior of pitch or pitch mucilage sample when measurable water (or salt solution) spreads in pitch or mucilage, through the contrast with the dynamic rheological behavior data of the sample under the anhydrous state, can analyze pitch or pitch mucilage sample because the performance decay condition of water damage (cohere damage and adhesion damage). Therefore, the utility model provides an improve dynamic shear rheometer parallel plate provides a quantitative analysis pitch or asphalt mastic sample's a way of water damage resistance, possesses certain using value.
The utility model provides a pair of rheometer parallel plate is cuted to modified developments, but the dynamic rheological behavior of pitch or pitch mucilage sample when measurable water (or salt solution) spreads in pitch or mucilage, through the contrast with the dynamic rheological behavior data of the sample under the anhydrous state, can analyze pitch or pitch mucilage sample because the performance decay condition of water damage (cohere damage and adhesion damage). Therefore, the utility model provides an improve dynamic shear rheometer parallel plate provides a quantitative analysis pitch or asphalt mastic sample's a way of water damage resistance, possesses certain using value.
The above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that the present invention can be modified or equivalent substituted for some features without departing from the spirit and scope of the present invention.
Claims (10)
1. An improved dynamic shear rheometer parallel plate comprising an upper parallel plate comprising a bottom platform (1) and a first handle (201), and a lower parallel plate comprising a second handle (202), a top platform (3), a boss (4), and a sleeve (5); the lower surface of the top platform (3) is fixedly connected with a second handle (202), and the upper surface of the top platform (3) is fixedly connected with a boss (4); the peripheral edges of the upper surface of the top platform (3) are detachably connected with upright sleeves (5) to form a groove capable of containing liquid, the sleeves (5) form the side surfaces of the groove, and the top platform (3) forms the bottom surface of the groove; the top of the boss (4) is correspondingly provided with a bottom platform (1) of an upper parallel plate, and the upper surface of the bottom platform (1) is fixedly connected with a first handle (201); the top platform (3), the second handle (202), the boss (4), the bottom platform (1) and the first handle (201) are coaxially arranged; the sample to be tested is placed between the boss (4) and the bottom platform (1); the first handle (201) and the second handle (202) are both connected with the dynamic shear rheometer in a mounting mode.
2. Improved dynamic shear rheometer parallel plate according to claim 1, wherein the bottom platform (1), the top platform (3), the boss (4) and the sleeve (5) are all circular, the bottom platform (1) and the boss (4) having the same diameter.
3. Improved dynamic shear rheometer parallel plate according to claim 2, wherein the diameter of the bottom platform (1) is 5-40 mm.
4. Improved dynamic shear rheometer parallel plate according to claim 2, characterized in that the diameter of the bottom platform (1) is 25mm or 8 mm.
5. The improved dynamic shear rheometer parallel plate of claim 1, wherein the top platform (3) is attached to the sleeve (5) at its peripheral edges at the top surface by a mortise and tenon joint.
6. Improved dynamic shear rheometer parallel plate according to claim 5, characterized in that the top platform (3) has at its peripheral edges tenon means cooperating with mortise means at the bottom of the sleeve (5).
7. The improved dynamic shear rheometer parallel plate of claim 1, wherein the first handle (201) and the second handle (202) are dumbbell structures with a middle diameter smaller than the diameters of the two ends for mounting on the dynamic shear rheometer; the first handle (201) and the second handle (202) are connected with the dynamic shear rheometer in a mounting mode through screw clamping.
8. The improved dynamic shear rheometer parallel plate of claim 1, wherein the boss (4), top platform (3), and second handle (202) are integrally formed; the bottom platform (1) and the first handle (201) are integrally formed.
9. The improved dynamic shear rheometer parallel plate of claim 1, wherein the upper and lower parallel plates are made of a metallic material that does not undergo a physicochemical reaction with a salt solution at a temperature of-20 ℃ to 500 ℃.
10. The improved dynamic shear rheometer parallel plate of claim 1, wherein the bottom platform (1), the top platform (3), and the bosses (4) are all 1mm to 10mm thick.
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| CN201920578632.4U CN210090213U (en) | 2019-04-25 | 2019-04-25 | Improved dynamic shear rheometer parallel plate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520863A (en) * | 2018-12-18 | 2019-03-26 | 天津市港源试验仪器厂 | A kind of dynamic shear rheometer |
| CN110031336A (en) * | 2019-04-25 | 2019-07-19 | 华南理工大学 | A kind of improved dynamic shear rheometer parallel-plate and its test method |
-
2019
- 2019-04-25 CN CN201920578632.4U patent/CN210090213U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520863A (en) * | 2018-12-18 | 2019-03-26 | 天津市港源试验仪器厂 | A kind of dynamic shear rheometer |
| CN110031336A (en) * | 2019-04-25 | 2019-07-19 | 华南理工大学 | A kind of improved dynamic shear rheometer parallel-plate and its test method |
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