CN110031336B - Improved dynamic shear rheometer parallel plate and testing method thereof - Google Patents
Improved dynamic shear rheometer parallel plate and testing method thereof Download PDFInfo
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- CN110031336B CN110031336B CN201910340416.0A CN201910340416A CN110031336B CN 110031336 B CN110031336 B CN 110031336B CN 201910340416 A CN201910340416 A CN 201910340416A CN 110031336 B CN110031336 B CN 110031336B
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- 238000012360 testing method Methods 0.000 title claims abstract description 55
- 239000010426 asphalt Substances 0.000 claims abstract description 111
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 44
- 239000011707 mineral Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 230000002093 peripheral effect Effects 0.000 claims abstract description 9
- 239000004568 cement Substances 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 14
- 239000012266 salt solution Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 8
- 238000010998 test method Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000000518 rheometry Methods 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 abstract description 6
- 238000011158 quantitative evaluation Methods 0.000 abstract description 3
- 229920000715 Mucilage Polymers 0.000 abstract 2
- 238000011156 evaluation Methods 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004445 quantitative analysis Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 239000011345 viscous material Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses an improved parallel plate of a dynamic shear rheometer and a testing method thereof. The improved dynamic shear rheometer parallel plate 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 peripheral edge 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 a mounting way. The invention can quantitatively test the rheological property of asphalt or mucilage under the condition of water under the contact state of the surface of the real mineral aggregate, so that the quantitative evaluation of the water damage resistance of different types of asphalt or mucilage based on an asphalt shear rheometer is possible.
Description
Technical Field
The invention belongs to asphalt performance testing equipment, and relates to an improved dynamic shear rheometer parallel plate and a testing method thereof.
Background
The water damage of asphalt pavement is one of the main forms of asphalt pavement damage, and according to the existing research, the water damage of asphalt pavement is one of the key factors causing early diseases of pavement, and the water damage problem is more and more a worldwide problem in recent years due to close relation between the water damage problem and road performance. The current forms of damage to water are largely categorized into three types: cohesive failure, adhesive failure, and cohesive adhesive composite failure. Adhesion failure refers to the occurrence of adhesion failure at the weak interface between asphalt and aggregate, and cohesive failure refers to cracking failure within the asphalt or asphalt cement due to reduced cohesion. Aiming at the problem of water damage, different students develop intensive researches based on different theoretical methods (fracture mechanics, damage mechanics and the like) and different scales (macroscopic, microscopic and even nano-scale), a plurality of achievements are formed, the evaluation characterization of asphalt and aggregate adhesiveness and asphalt anti-stripping capability at home and abroad is also included in corresponding specifications, however, in the existing specifications, the evaluation of asphalt or asphalt cement water damage resistance is mainly qualitative evaluation, the problem that the relevance of evaluation indexes and engineering practical application conditions is not strong exists, the quantitative evaluation method is mostly complex, and the operation requirement is high. Therefore, the exploration of a new evaluation method for the water damage resistance of asphalt or asphalt cement has important significance and value.
Although the mass percentage of asphalt in the asphalt mixture is only about 3-6%, asphalt is used as a typical thermal rheological material, and the rheological property of asphalt can obviously influence the high-low temperature performance and fatigue performance of the asphalt mixture, which forms consensus in the road industry. The process of the road running load acting on the road surface is expressed as a cyclic process of road compression, then tension and then compression, so that the dynamic loading mode is adopted to develop and research the deformation characteristics of asphalt and the mixture thereof under the action of dynamic load, thereby analyzing the dynamic mechanical response behavior of the asphalt and the mixture thereof, and having important practical significance. Under the background, students at home and abroad use a Dynamic Shear Rheometer (DSR) as an analysis instrument for dynamic rheological properties of asphalt and mixtures thereof to develop and research dynamic mechanical properties of the asphalt and the mixtures thereof. Based on DSR, asphalt rheology data over a wide temperature and frequency range can be obtained, enabling a more comprehensive analysis of asphalt rheology than conventional asphalt targets.
However, the current mainstream shear rheometers are all default to determine the rheological properties of asphalt under the conventional state, and specific embodiments are as follows: placing the poured asphalt sample between an upper clamp and a lower clamp, heating to soften asphalt, and controlling the distance between the upper clamp and the lower clamp to a proper position to form a sandwich structure so as to finish the test of rheological property of the intermediate asphalt layer. Obviously, based on DSR equipment, the rheological property of asphalt or asphalt cement under the 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 novel quantitative analysis and evaluation method and a novel quantitative analysis and evaluation way are provided for exploring the failure mechanism of adhesion damage and cohesive failure of asphalt and cement.
Disclosure of Invention
The invention aims to provide an improved parallel plate of a dynamic shear rheometer and a testing method thereof, so that the dynamic rheological property of asphalt and asphalt cement in a real mineral aggregate contact state can be simulated under the condition of water, and a new analysis and evaluation way is provided for representing the water damage resistance of asphalt and cement thereof.
In order 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 peripheral edges of the upper surface of the top platform are detachably connected with upright sleeves to form a groove capable of containing liquid, a sealing structure is formed, the sleeves form the side surfaces 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 arranged on the same shaft; 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 a mounting way.
Preferably, the bottom platform, the top platform, the boss and the sleeve are all round, the diameters of the bottom platform and the boss are the same, and the diameter is 5-40 mm.
Preferably, the diameter of the bottom land is 25mm or 8mm.
Preferably, the peripheral edge of the upper surface of the top platform is connected with the sleeve through a mortise and tenon structure.
Preferably, the first handle and the second handle are dumbbell structures with middle diameters smaller than diameters of two ends so as to be installed and fixed on the dynamic shear rheometer; the first handle and the second handle are connected with the dynamic shear rheometer by means of 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 at the temperature of-20 ℃ to 500 ℃ and have certain hardness and do not react with salt solution in a physical and chemical way.
Preferably, the thickness of the bottom platform, the top platform and the boss is 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.
The invention also provides a method for testing rheological property of asphalt or asphalt cement by using the improved dynamic shear rheometer parallel plate, which comprises the following steps:
1) According to the testing purpose and the requirements, selecting an upper parallel plate and a lower parallel plate with corresponding specifications, assembling a sleeve on a top platform, fixing a second handle above a base and a heating system of the dynamic shear rheometer through screw clamping, and fixing a first handle on a loop bar of the dynamic shear rheometer through screw clamping;
2) The specification selection of the parallel plates, the correction of the system and the clearance return to zero between the upper parallel plate and the lower parallel plate are completed;
3) According to the test purpose or according to the regulation control mode, the test target temperature, the test frequency and the test time specified in JTG E20-2011 of the Highway engineering asphalt and asphalt mixture test procedure, the petrochemical industry standard SH/T0777-2005 of the people's republic of China, and the American road traffic officials society standard AASHTO T315-09;
4) Placing pre-poured asphalt or asphalt cement samples 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, heating the upper parallel plate and the lower parallel plate to a temperature T, wherein T is more than or equal to 46 ℃, adjusting the distance between the upper parallel plate and the lower parallel plate after the asphalt or asphalt cement samples are heated and softened, removing asphalt overflowed by extrusion of the upper parallel plate and the lower parallel plate, cooling or heating the asphalt or asphalt cement samples to a test target temperature by using a cooling system or a heating system, and preserving heat for 15-60 min at the test target temperature;
5) Adding water or salt solution which is 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 preserving heat for a plurality of times at the test target temperature according to the test purpose;
6) Dynamic rheology testing was performed.
Preferably, the lower surface of the bottom platform and the upper surface of the boss are respectively fixed with a pre-prepared cylinder mineral aggregate, wherein the cylinder mineral aggregate comprises 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 cylinder mineral aggregate, the bottom platform and the boss are coaxially arranged, and a pre-poured asphalt or asphalt cement sample is put into the upper surface of the lower target mineral aggregate.
Preferably, the cylindrical mineral aggregate is fixed to the lower surface of the bottom platform and the upper surface of the boss by glue bonding.
Preferably, the height of the added water or salt solution in the recess is the upper surface of the upper target mineral aggregate.
Preferably, the dynamic shear rheometer is an AR-2000 rheometer manufactured by TA company.
Preferably, the test target temperature of the dynamic shear rheometer is adjusted to 5-85 ℃.
Preferably, the test target temperature of the dynamic shear rheometer is adjusted to-20 to 150 ℃.
Preferably, the frequency of the dynamic shear rheometer is adjusted to 7.5E-7 to 628rad/s.
Compared with the prior art, the invention has the following beneficial effects and advantages:
The improved dynamic shear rheometer parallel plate, the upper parallel plate and the lower parallel plate can be used for binding mineral aggregate, and the rheological property of asphalt or asphalt cement based on the surface of the real mineral aggregate can be tested under the anhydrous condition without externally connecting a sleeve. 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) diffuses in the 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 with the sample in the anhydrous state. Therefore, the improved dynamic shear rheometer parallel plate provided by the invention provides a way for quantitatively analyzing the water damage resistance of asphalt or asphalt cement samples, and has a certain application 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 a parallel plate in a simulated mineral pitch contact and water environment provided by the invention;
FIG. 4 is a Dynamic Shear Rheometer (DSR) standard test fixture and direction of rotation;
Fig. 5 is a schematic diagram of shear stress (strain) and phase difference.
Reference numerals in the drawings denote: 1. the device comprises a bottom platform, 201, a first handle, 202, a second handle, 3, a top platform, 4, a boss, 5, a sleeve, 6, an upper target mineral aggregate, 7, a lower target mineral aggregate, 8, a sample to be tested, 9, water or salt solution, 10, an upper metal plate, 11 and a lower metal plate.
The present invention will be described in further detail with reference to the accompanying 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 concentrically arranged; an 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 attached to the dynamic shear rheometer. The bottom platform 1, the top platform 3, the boss 4 and the sleeve 5 are all circular, the diameter of the bottom platform 1 is the same with that of the boss 4, the diameter is 25mm, the peripheral edge of the upper surface of the top platform 3 is connected with the sleeve 5 through a mortise and tenon structure, the peripheral edge of the upper surface of the top platform 3 is provided with a tenon structure, and the bottom of the sleeve 5 is provided with a mortise and tenon structure. The first handle 201 and the second handle 202 are dumbbell structures with middle diameters smaller than diameters of two ends, so that the dumbbell structures are installed on a dynamic shear rheometer and fixed through screw clamping. Boss 4, top deck 3 and second handle 202 are integrally formed; the base platform 1 and the first handle 201 are integrally formed.
The embodiment also provides a method for testing the rheological property of asphalt by using the improved dynamic shear rheometer parallel plate, which comprises the following steps:
1) An asphalt time scan test was performed at a test target temperature of 40 c, and a bottom land 1 and a boss 4 having a diameter of 25mm were selected. The sleeve 5 is assembled on the top platform 3, the second handle 202 is fixed above the base of the dynamic shear rheometer and the heating system through screw clamping, and the first handle 201 is fixed on the loop bar of the dynamic shear rheometer through screw clamping; the lower surface of the bottom platform 1 and the upper surface of the boss 4 are respectively fixed with a pre-prepared cylinder mineral aggregate through high-strength glue, wherein the cylinder mineral aggregate comprises 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 bottom platform 1 and the boss 4 have the same diameter, which is 25mm.
2) Completing parallel plate specification selection, system correction and clearance zeroing after the upper parallel plate and the lower parallel plate bond target mineral aggregate in DSR control software;
3) According to the AR-2000 rheometer manufactured by TA company and with the DSR machine model adopted in the embodiment, the distance between the upper target mineral aggregate and the lower target mineral aggregate is adjusted to be 1mm according to the purpose of experimental study, the adjustment test mode is time scanning, the frequency is set to be 10HZ, the stress control mode is set to be 30kpa, the test duration is 2h, and the sampling time interval is 10s.
4) Placing a pre-poured asphalt sample 8 on the upper surface of a lower target mineral aggregate 7, heating an upper parallel plate and a 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 heat, 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 and overflowed by the upper target mineral aggregate 6 and the lower target mineral aggregate 7, cooling the asphalt sample 8 to 40 ℃ by natural cooling, and preserving heat for 15min at a target temperature of 40 ℃;
5) Adding water 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 heat for 1h at 40 ℃ during which time the water is subjected to osmotic diffusion in asphalt;
6) And finally, carrying out a time scanning test, obtaining test data such as complex modulus, loss modulus, storage modulus, phase angle and the like, drawing a y-x curve of complex modulus-loading times or time, carrying out a comparison test of changing only water conditions into anhydrous conditions and keeping other parameters unchanged, and obtaining asphalt rheological property attenuation conditions under water environment by comparing two groups of test results, thereby realizing quantitative analysis of fatigue damage conditions under asphalt water damage.
The principle of DSR test is shown in fig. 4 and 5, DSR can apply sine alternating shear stress to test the viscoelasticity of a material, the phase angle delta is the lag angle between the strain and the stress of the material, the phase angles of an ideal elastic material and an ideal viscous material are respectively 0 DEG and 90 DEG, and the phase angle of the viscoelasticity material is between 0 DEG and 90 deg. 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 moment of torsion and drives last metal sheet 10 and rotate, and lower metal sheet then is fixed in on the base of instrument, realizes the rheological property test to pitch sample through the dynamic shear load that applys.
The processing method of the upper target mineral aggregate 6 and the lower target mineral aggregate 7 is as follows: and selecting parallel plates with corresponding specifications according to test requirements, determining the diameter of a block stone cylinder according to the specifications of the parallel plates, drilling the block stone, cutting a rock core into slices by using a cutting machine, and suggesting that the rock thickness is selected in an integer within the range of 3-6 mm. In addition, as the surface roughness of the tested mineral aggregate is similar to that of the unprocessed mineral aggregate as much as possible, laser testing equipment or other fine micro-texture detection equipment can be used for detecting the roughness, and sand paper with proper mesh number can be selected for polishing when the roughness of the cut mineral aggregate is changed. The rationality and the accuracy of the DSR test are ensured by the method.
The duration of the soaking process of the sample to be tested under the water condition can be selected according to the test purpose.
The improved parallel plate of the dynamic shear rheometer provided by the invention can be used for testing the dynamic rheological property of an asphalt or asphalt cement sample when water (or salt solution) is diffused in asphalt or cement, and analyzing the property attenuation condition of the asphalt or asphalt cement sample due to water damage (cohesive damage and adhesive damage) by comparing the dynamic rheological property data of the sample in a non-water state. Therefore, the improved dynamic shear rheometer parallel plate provided by the invention provides a way for quantitatively analyzing the water damage resistance of asphalt or asphalt cement samples, and has a certain application value.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting thereof; although the invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that modifications and equivalents may be made to the specific embodiments of the invention or to some of the technical features without departing from the spirit of the invention, and they are intended to be covered by the scope of the claimed invention.
Claims (9)
1. A method of testing the rheological properties of asphalt or asphalt cement, characterized in that the method is performed with a modified 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 arranged in a concentric shaft manner; 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 way;
the method comprises the following steps:
1) According to the testing purpose and requirements, selecting an upper parallel plate and a lower parallel plate with corresponding specifications, assembling a sleeve (5) on a top platform (3), fixing a second handle (202) above a base and a heating system of the dynamic shear rheometer through screw clamping, and fixing a first handle (201) on a loop bar of the dynamic shear rheometer through screw clamping;
2) Completing the correction of the system and the clearance return to zero between the upper parallel plate and the lower parallel plate;
3) According to the test purpose or according to the regulation control mode, the test target temperature, the frequency and the test time specified in JTG E20-2011 of the Highway engineering asphalt and asphalt mixture test procedure, the petrochemical industry standard SH/T0777-2005 of the people's republic of China or the standard AASHTO T315-09 of the American road traffic officials society;
4) Placing pre-poured asphalt or asphalt cement samples on the upper surface of the boss (4), heating the upper parallel plate and the lower parallel plate by using a heating system of a dynamic shear rheometer, heating the upper parallel plate and the lower parallel plate to a temperature T which is more than or equal to 46 ℃, adjusting the distance between the upper parallel plate and the lower parallel plate after the asphalt or asphalt cement samples are heated and softened, removing the asphalt overflowed by extrusion of the upper parallel plate and the lower parallel plate, cooling or heating the asphalt or asphalt cement samples to a test target temperature by using a cooling system or a heating system, and preserving heat for 15-60 min at the test target temperature;
5) Adding water or salt solution which is 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 (1), and then preserving heat for a plurality of times at the test target temperature according to the test purpose;
6) Dynamic rheology testing was performed.
2. The method for testing rheological properties of asphalt or asphalt cement according to claim 1, wherein the bottom platform (1), the top platform (3), the boss (4) and the sleeve (5) are all round, the diameters of the bottom platform (1) and the boss (4) are the same, and the diameters are 5-40 mm.
3. A method of rheological property testing of asphalt or asphalt cement according to claim 2, characterized in that the diameter of the bottom platform (1) is 25mm or 8mm.
4. The method for testing rheological properties of asphalt or asphalt cement according to claim 1, wherein the peripheral edge of the upper surface of the top platform (3) is connected with the sleeve (5) through a mortise and tenon structure, the peripheral edge of the upper surface of the top platform (3) is provided with a mortise and tenon structure, and the mortise and tenon structure is matched with the mortise and tenon structure at the bottom of the sleeve (5).
5. A method of testing the rheological properties of asphalt or asphalt cement according to claim 1, wherein the first handle (201) and the second handle (202) are dumbbell structures with a smaller middle diameter than the two ends for mounting on a dynamic shear rheometer; the first handle (201) and the second handle (202) are connected with the dynamic shear rheometer by means of screw clamping.
6. The method for testing rheological properties of asphalt or asphalt cement according to claim 1, wherein the upper and lower parallel plates are made of a metal material which does not react with a salt solution in a physicochemical manner at a temperature of-20 ℃ to 500 ℃; the thickness of the bottom platform (1), the top platform (3) and the boss (4) is 1-10 mm; 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.
7. A method of testing the rheological properties of asphalt or asphalt cement according to claim 1, characterized in that a pre-prepared cylinder of mineral aggregate is fixed to the lower surface of the bottom platform (1) and to the upper surface of the boss (4), respectively, the cylinder of mineral aggregate comprising a lower fixed upper target mineral aggregate (6) of the bottom platform (1) and a lower fixed target mineral aggregate (7) of the upper surface of the boss (4); the cylinder mineral aggregate, the bottom platform (1) and the boss (4) are arranged coaxially, and a pre-poured asphalt or asphalt cement sample is put into the upper surface of the lower target mineral aggregate (7).
8. A method of testing the rheological properties of asphalt or asphalt cement according to claim 7, characterized in that the cylindrical mineral aggregate is fixed to the lower surface of the bottom platform (1) and to the upper surface of the boss (4) by means of glue bonding.
9. A method of testing the rheological properties of asphalt or asphalt cement according to claim 7, characterized in that the height of the added water or salt solution in the recess is the upper surface of the upper target mineral aggregate (6).
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| US5540088A (en) * | 1994-01-24 | 1996-07-30 | Bohlin Instruments Limited | Rheometer and method of measuring rheological properties |
| CN102507378A (en) * | 2011-11-01 | 2012-06-20 | 长安大学 | Improved dynamic shear rheometer fixture and testing method |
| CN210090213U (en) * | 2019-04-25 | 2020-02-18 | 华南理工大学 | Improved dynamic shear rheometer parallel plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5540088A (en) * | 1994-01-24 | 1996-07-30 | Bohlin Instruments Limited | Rheometer and method of measuring rheological properties |
| CN102507378A (en) * | 2011-11-01 | 2012-06-20 | 长安大学 | Improved dynamic shear rheometer fixture and testing method |
| CN210090213U (en) * | 2019-04-25 | 2020-02-18 | 华南理工大学 | Improved dynamic shear rheometer parallel plate |
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