CN114034562B - Aggregate and asphalt tensile failure evaluation method - Google Patents
Aggregate and asphalt tensile failure evaluation method Download PDFInfo
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- CN114034562B CN114034562B CN202111491901.1A CN202111491901A CN114034562B CN 114034562 B CN114034562 B CN 114034562B CN 202111491901 A CN202111491901 A CN 202111491901A CN 114034562 B CN114034562 B CN 114034562B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 146
- 238000011156 evaluation Methods 0.000 title claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000006073 displacement reaction Methods 0.000 claims abstract description 16
- 238000009864 tensile test Methods 0.000 claims abstract description 13
- 238000012360 testing method Methods 0.000 claims description 111
- 239000003822 epoxy resin Substances 0.000 claims description 14
- 229920000647 polyepoxide Polymers 0.000 claims description 14
- 238000005498 polishing Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims description 2
- 230000007246 mechanism Effects 0.000 abstract description 7
- 230000001687 destabilization Effects 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
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- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 108010025899 gelatin film Proteins 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
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- 239000006028 limestone Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides an aggregate and asphalt tensile failure assessment method, which utilizes a dynamic shear rheometer to carry out tensile test on an asphalt mixture to obtain a normal force-tensile displacement curve graph of the asphalt mixture, and assesses the failure mechanism of the aggregate and asphalt according to the curve graph. The graph obtained by the aggregate and asphalt tensile failure evaluation method provided by the invention can accurately judge the failure types of the aggregate and asphalt, can further calculate the critical thickness of different failure types of the asphalt mixture, and has important significance for researching and improving the fatigue resistance of the asphalt mixture; in addition, the invention utilizes the dynamic shear rheometer to carry out tensile test on the asphalt mixture, does not need other instruments, does not need to adjust the dynamic shear rheometer, has simple operation method and improves the evaluation efficiency.
Description
Technical Field
The invention relates to the technical field of road materials, in particular to an aggregate and asphalt tensile failure evaluation method.
Background
In recent years, asphalt pavement is a main form of modern traffic road by virtue of the characteristics of flat road surface, comfortable running, low noise, short construction period, simple maintenance and the like. However, under the repeated action of the dynamic load of the wheels, the asphalt pavement is easy to generate tensile failure, so that diseases such as ruts, looseness, and congestion are formed, and the normal use of the road is affected.
The main materials of the asphalt pavement are asphalt mixtures, the tensile failure of the asphalt mixtures is usually represented by adhesion failure of an asphalt-aggregate interface and adhesion failure of asphalt per se, and the current test of tensile failure of the asphalt mixtures is mostly concentrated on the adhesion failure of the asphalt-aggregate interface, such as a water boiling method, a water immersion method, a BBS (adhesive bonding strength) test, a tension test based on DMA (dynamic mechanical analyzer) and the like, so that the research on the adhesion failure of asphalt per se is lacking; on the other hand, the method has the problems of poor accuracy of test results, lack of quantitative evaluation indexes for tensile failure, complex operation and the like.
In view of the above drawbacks, there is a need to provide a method that can accurately evaluate aggregate and asphalt failure mechanisms.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention provides an aggregate and asphalt tensile failure assessment method, which utilizes a dynamic shear rheometer to conduct tensile test on an asphalt mixture to obtain a normal force-tensile displacement curve graph of the asphalt mixture, and evaluates failure mechanisms of aggregate and asphalt according to the curve graph. The graph obtained by the aggregate and asphalt tensile failure evaluation method provided by the invention can accurately judge the failure types of the aggregate and asphalt, can further calculate the critical thickness of different failure types of the asphalt mixture, and has important significance for researching and improving the fatigue resistance of the asphalt mixture; in addition, the invention utilizes the dynamic shear rheometer to carry out tensile test on the asphalt mixture, does not need other instruments, does not need to adjust the dynamic shear rheometer, has simple operation method and improves the evaluation efficiency.
To achieve the above and other related objects, the present invention provides a method for evaluating tensile failure of aggregates and asphalt, comprising the steps of:
s1: preparing an aggregate test piece, wherein the aggregate test piece comprises a first aggregate test piece and a second aggregate test piece which are identical;
s2: the first aggregate test piece and the second aggregate test piece are installed in a dynamic shear rheometer, and the first aggregate test piece is positioned above the second aggregate test piece and is coaxially arranged;
S3: placing an asphalt test piece between the first aggregate test piece and the second aggregate test piece, and extruding the asphalt test piece to a target thickness, wherein the first aggregate test piece, the second aggregate test piece and the asphalt test piece form an asphalt mixture;
s4: and carrying out a tensile test on the asphalt mixture by using a dynamic shear rheometer to obtain a normal force F-tensile displacement d curve graph of the asphalt mixture, and evaluating a failure mechanism of aggregate and asphalt to be evaluated according to the curve graph.
Optionally, step S1 includes the steps of:
providing a collecting plate, polishing the collecting plate into a mirror surface, and sequentially carrying out rough grinding, fine grinding, scratch repairing, polishing and mirror polishing treatment;
Cutting the material collecting plate to a thickness of 2mm, and manufacturing a cylindrical material collecting test piece by using a coring machine.
Optionally, step S2 includes the steps of:
The first connecting base and the second connecting base are respectively arranged in an upper clamp and a lower clamp of the dynamic shear rheometer;
Coating epoxy resin on the bottom surface of the first aggregate test piece, and fixedly aligning and connecting the first aggregate test piece with the first connecting base to form a first component, coating epoxy resin on the bottom surface of the second aggregate test piece, and fixedly aligning and connecting the second aggregate test piece with the second connecting base to form a second component;
After the epoxy resin is preliminarily hardened, the first component and the second component are taken out from the dynamic shear rheometer, and the first component and the second component are placed on a horizontal table until the epoxy resin is completely cured;
the first and second components are mounted to the dynamic shear rheometer.
Optionally, step S3 includes the steps of:
heating the aggregate test piece through a temperature control device of the dynamic shear rheometer;
Placing the asphalt test piece on the surface of the second aggregate test piece, and extruding the asphalt test piece to a scratch film thickness by the first aggregate test piece;
the asphalt test piece is subjected to film scraping treatment,
The asphalt test piece is further pressed by the first aggregate test piece to the target thickness t k.
Optionally, the asphalt test piece is a cylinder, and the bottom radius R 2 of the asphalt test piece is equal to the bottom radius R 1 of the aggregate test piece.
Optionally, the ratio of the target thickness to the scratch film thickness is 40:41.
Optionally, the target thickness t k is between 100 μm and 350 μm.
Optionally, step S4 further includes:
respectively carrying out tensile tests on asphalt mixtures with different target thicknesses to obtain a normal force F-tensile displacement d curve graph of the asphalt mixtures with different target thicknesses;
For each target thickness, taking the maximum value F max of the normal force, obtaining the tensile strength S t of the asphalt mixture of that target thickness:
optionally, step S4 further includes: and judging the failure type of the aggregate and the asphalt according to the normal force F-stretching displacement d curve graph.
Optionally, step S4 further includes:
According to the tensile strength, a tensile strength S t- target thickness t k curve chart of asphalt mixtures with different target thicknesses is obtained;
Fitting the target thickness t k curve graph of the tensile strength S t- for multiple times to obtain critical thickness of asphalt of different failure types of the aggregate and the asphalt
Optionally, the method further comprises:
according to the critical thickness Judging the failure type of the aggregate and asphalt to be evaluated, and when the target thickness/>When the tensile failure type of the aggregate to be evaluated and the asphalt is adhesion failure of an asphalt-aggregate interface;
When the target thickness is And when the tensile failure type of the aggregate and the asphalt to be evaluated is cohesive failure of the asphalt.
Optionally, the relationship between the tensile strength S t and the target thickness t k is:
Optionally, the critical thickness
The aggregate and asphalt tensile failure evaluation method provided by the invention has at least the following technical effects:
According to the aggregate and asphalt tensile failure assessment method provided by the invention, a dynamic shear rheometer is utilized to carry out tensile test on the asphalt mixture, a normal force-tensile displacement curve graph of the asphalt mixture is obtained, and the failure mechanism of the aggregate and asphalt is assessed according to the curve graph. The graph obtained by the aggregate and asphalt tensile failure evaluation method provided by the invention can accurately judge the failure types of the aggregate and asphalt, can further calculate the critical thickness of asphalt with different failure types of asphalt mixture, can judge the failure types of the asphalt mixture to be evaluated according to the critical thickness, and has important significance for researching and improving the fatigue resistance of the asphalt mixture; in addition, the invention utilizes the dynamic shear rheometer to carry out tensile test on the asphalt mixture, does not need other instruments, does not need to adjust the dynamic shear rheometer, has simple operation method and improves the evaluation efficiency.
Drawings
FIG. 1 is a flow chart showing an aggregate and bitumen tensile failure assessment method provided in the examples.
Fig. 2 shows a schematic diagram of an asphalt mix installed in a dynamic shear rheometer.
FIG. 3 shows a plot of normal force F versus tensile displacement d for the asphalt mixture obtained in example step S4.
Description of element reference numerals
11. First connecting base
12. Second connecting base
21. Upper clamp
22. Lower clamp
31. First aggregate test piece
32. Second aggregate test piece
41. First part
42. Second part
50. Asphalt test piece
100. Dynamic shear rheometer
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
It should be noted that, the illustrations provided in the present embodiment only illustrate the basic concept of the present invention by way of illustration, but only the components related to the present invention are shown in the illustrations, rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, number, positional relationship and proportion of each component in actual implementation may be changed at will on the premise of implementing the present technical solution, and the layout of the components may be more complex.
Examples
The embodiment provides an aggregate and asphalt tensile failure evaluation method, as shown in fig. 1, specifically comprising the following steps:
Step S1: preparing an aggregate test piece, wherein the aggregate test piece comprises a first aggregate test piece and a second aggregate test piece which are identical;
Firstly, providing a collecting plate, polishing the collecting plate into a mirror surface by utilizing a polishing machine, and sequentially carrying out rough polishing, fine polishing, scratch repairing, polishing and mirror polishing treatment on the collecting plate by utilizing different polishing sheets. As an example, the collecting plate may be selected from one of granite, limestone, and basalt, and in this embodiment, the collecting plate is basalt.
And then cutting the collecting plate by using a cutting machine, fixing the cut collecting plate on a coring machine, and drilling the collecting plate by using a drill bit to obtain a cylindrical collecting test piece. As an example, the thickness of the cut aggregate plate is 2mm, and the radius R 1 of the bottom surface of the manufactured cylindrical aggregate test piece is 4mm.
Step S2: the first aggregate test piece and the second aggregate test piece are installed in a dynamic shear rheometer, and the first aggregate test piece is positioned above the second aggregate test piece and is coaxially arranged;
first, as shown in fig. 2, the first connection base 11 and the second connection base 12 are mounted in the upper jig 21 and the lower jig 22 of the dynamic shear rheometer 100, respectively, and the first connection base 11 and the second connection base 12 are fixed in the upper jig 21 and the lower jig 22 by washers, screws, nuts (not shown in the drawings). As an example, the first connection base 11 and the second connection base 12 are of exactly the same cylindrical structure.
Then, in the zeroing correction mode of the dynamic shear rheometer 100, coating epoxy resin on the bottom surface of the first aggregate test piece 31, and fixedly aligning and connecting the epoxy resin with the first connecting base 11 to form a first component 41; an epoxy resin is applied to the bottom surface of the second aggregate test piece 32 and is fixedly aligned with the second connector base 12 to form a second component 42. As an example, the bottom areas of the first and second connection bases 11, 12 are greater than or equal to the bottom areas of the first and second aggregate test pieces 31, 32, respectively. Preferably, the bottom areas of the first and second connection bases 11, 12 are equal to the bottom areas of the first and second aggregate test pieces 31, 32, respectively. And then, ensuring that the aggregate test piece and the connecting base are concentrically and coaxially arranged through fine adjustment of the position.
After the epoxy resin is preliminarily cured, the automated shear rheometer 100 takes out the first and second parts 41 and 42 and places the first and second parts 41 and 42 on the horizontal table 24h until the epoxy resin is completely cured. After the epoxy resin is fully cured, the first part 41 and the second part 42 are installed into the dynamic shear rheometer 100.
Step S3: placing an asphalt test piece between the first aggregate test piece and the second aggregate test piece, and extruding the asphalt test piece to a target thickness, wherein the first aggregate test piece, the second aggregate test piece and the asphalt test piece form an asphalt mixture;
first, the dynamic shear rheometer 100 is calibrated, e.g., inertia corrected, motor corrected, zeroing corrected, etc., to avoid errors in the instrument during testing.
Next, the first aggregate test piece 31 and the second aggregate test piece 32 are heated by the temperature control device of the dynamic shear rheometer 100, and the heating temperature is 40 ℃ as an example.
Next, the pre-made asphalt test piece 50 is placed on the surface of the second aggregate test piece 32. In this embodiment, the No. 70 matrix asphalt is placed in an oven, baked at 135 ℃ to form a flowing state, and then taken out and poured into a silica gel film to form an asphalt test piece 50, wherein the asphalt test piece 50 is a cylinder, and the bottom radius R 2 of the asphalt test piece is equal to the bottom radius R 1 of the aggregate test piece, and is 4mm.
Then, the first aggregate test piece 31 presses the asphalt test piece 50 to a scratch film thickness, and after the scratch film treatment, the first aggregate test piece 31 further presses the asphalt test piece 50 to a target thickness, at which time the first aggregate test piece 31, the second aggregate test piece 32, and the asphalt test piece 50 form an asphalt mixture. In this embodiment, the target thickness t k is between 100 μm and 350 μm, and may be, for example, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, and 350 μm, and the ratio of the target thickness to the scratch film thickness is 40:41.
Finally, the asphalt mixture was heated to the test temperature and the temperature was controlled for 10min. As an example, the test temperatures may be 20 ℃, 25 ℃ and 30 ℃, in this example, 30 ℃.
Step S4: and carrying out a tensile test on the asphalt mixture by using a dynamic shear rheometer to obtain a normal force F-tensile displacement d curve graph of the asphalt mixture, and evaluating a failure mechanism of aggregate and asphalt to be evaluated according to the curve graph.
As an example, a tensile test was performed on an asphalt mixture using a dynamic shear rheometer at a tensile rate of 5 μm/s, and after the test was completed, a normal force F-tensile displacement d graph of the asphalt mixture of different target thicknesses was obtained, and the normal force F-tensile displacement d graph is shown in fig. 3. The failure type of the aggregate and the asphalt can be judged through a normal force F-stretching displacement d curve graph, for example, the curve graph with the target thickness t k of 100 mu m, 150 mu m, 200 mu m and 250 mu m shows two obvious rapid destabilization stages, the normal force F is rapidly reduced after reaching a peak value in the first stage and is stabilized at a smaller value for a long time, and adhesion failure of an asphalt-aggregate interface is dominant in the first stage; and in the second stage, in the later stage of complete failure of stretching, the phenomenon of destabilization of the normal force F is generated for the second time, and in the stage, the cohesive failure of the asphalt is dominant. Overall, for asphalt mixtures with target thicknesses t k of 100, 150, 200, and 250 μm for the asphalt test pieces, the main failure types are adhesion failure at the asphalt-aggregate interface. As the target thickness t k increases, the proportion of cohesive failure occupied becomes more and more obvious, and when the target thickness t k reaches 300 μm, the tensile failure is completely reflected as the cohesive failure of asphalt itself.
By way of example, the critical thickness of asphalt of different failure types of aggregate and asphalt can be further calculated through the normal force F-tensile displacement d curve chartFirst, for a certain target thickness t k, the maximum value F max of its normal force is read from the graph of its normal force F-tensile displacement d, and the tensile strength S t of the asphalt mixture is obtained from formula (1):
Calculating the tensile strength S t of a plurality of asphalt mixtures with different target thicknesses t k to obtain a graph taking the target thickness t k as an abscissa and the tensile strength S t as an ordinate, fitting the graph of the tensile strength S t- and the target thickness t k by using a formula (2), and calculating by using a formula (3) to obtain the critical thickness of asphalt with different failure types of aggregate and asphalt
By way of example, after the above critical thickness is obtained, the critical thickness can also be obtainedQuantitatively judging the failure types of aggregate and asphalt, and when the target thickness/>When the tensile failure type of the aggregate and the asphalt is adhesion failure of an asphalt-aggregate interface; when the target thickness/>And when the tensile failure type of the aggregates and the asphalt to be evaluated is cohesive failure of the asphalt.
In summary, the invention provides an aggregate and asphalt tensile failure assessment method, which utilizes a dynamic shear rheometer to carry out tensile test on an asphalt mixture to obtain a normal force-tensile displacement curve graph of the asphalt mixture, and assesses failure mechanisms of the aggregate and asphalt according to the curve graph. According to the invention, the adhesive characteristics of an aggregate-asphalt interface are researched, the failure types of the aggregate and the asphalt can be accurately judged through the graph obtained by the tensile failure evaluation method of the aggregate and the asphalt, and the critical thicknesses of different failure types of the asphalt mixture can be further calculated, so that the method has important significance in researching and improving the fatigue resistance of the asphalt mixture; in addition, the invention utilizes the dynamic shear rheometer to carry out tensile test on the asphalt mixture, does not need other instruments, does not need to adjust the dynamic shear rheometer, has simple operation method and improves the evaluation efficiency.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (9)
1. An aggregate and asphalt tensile failure assessment method is characterized by comprising the following steps:
s1: preparing an aggregate test piece, wherein the aggregate test piece comprises a first aggregate test piece and a second aggregate test piece which are identical;
s2: the first aggregate test piece and the second aggregate test piece are installed in a dynamic shear rheometer, and the first aggregate test piece is positioned above the second aggregate test piece and is coaxially arranged;
s3: placing an asphalt test piece between the first aggregate test piece and the second aggregate test piece, and extruding the asphalt test piece to a target thickness t k, wherein the first aggregate test piece, the second aggregate test piece and the asphalt test piece form an asphalt mixture;
S4: respectively carrying out tensile tests on asphalt mixtures with different target thicknesses by using a dynamic shear rheometer to obtain a normal force F-tensile displacement d curve graph of the asphalt mixtures with different target thicknesses, and taking a maximum value F max of the normal force for each target thickness to obtain the tensile strength S t of the asphalt mixtures with the target thickness: according to the tensile strength, a graph of tensile strength S t -target thickness t k of asphalt mixtures with different target thicknesses is obtained, and the relation between the tensile strength S t and the target thickness t k is/> Fitting the tensile strength S t -target thickness t k curve graph for multiple times to obtain critical thickness/>, of asphalt of different failure types, namely the aggregate and the asphaltThe critical thickness/>According to the critical thickness/>And judging the failure types of the aggregate and asphalt to be evaluated.
2. The aggregate and bitumen tensile failure assessment method according to claim 1, wherein step S1 comprises the steps of:
providing a collecting plate, polishing the collecting plate into a mirror surface, and sequentially carrying out rough grinding, fine grinding, scratch repairing, polishing and mirror polishing treatment;
Cutting the material collecting plate to a thickness of 2mm, and manufacturing a cylindrical material collecting test piece by using a coring machine.
3. The aggregate and bitumen tensile failure assessment method according to claim 1, wherein step S2 comprises the steps of:
The first connecting base and the second connecting base are respectively arranged in an upper clamp and a lower clamp of the dynamic shear rheometer;
Coating epoxy resin on the bottom surface of the first aggregate test piece, and fixedly aligning and connecting the first aggregate test piece with the first connecting base to form a first component, coating epoxy resin on the bottom surface of the second aggregate test piece, and fixedly aligning and connecting the second aggregate test piece with the second connecting base to form a second component;
After the epoxy resin is preliminarily hardened, the first component and the second component are taken out from the dynamic shear rheometer, and the first component and the second component are placed on a horizontal table until the epoxy resin is completely cured;
the first and second components are mounted to the dynamic shear rheometer.
4. The aggregate and bitumen tensile failure assessment method according to claim 2, wherein step S3 comprises the steps of:
heating the aggregate test piece through a temperature control device of the dynamic shear rheometer;
Placing the asphalt test piece on the surface of the second aggregate test piece, and extruding the asphalt test piece to a scratch film thickness by the first aggregate test piece;
the asphalt test piece is subjected to film scraping treatment,
The asphalt test piece is further pressed by the first aggregate test piece to the target thickness t k.
5. The method of claim 4, wherein the asphalt test piece is a cylinder and the bottom radius R 2 of the asphalt test piece is equal to the bottom radius R 1 of the aggregate test piece.
6. The aggregate to asphalt tensile failure evaluation method according to claim 4, wherein a ratio of the target thickness to the scratch film thickness is 40:41.
7. The aggregate and bitumen tensile failure assessment method according to claim 5, wherein the target thickness t k is between 100 μm and 350 μm.
8. The aggregate and bitumen tensile failure assessment method of claim 1, wherein step S4 further comprises: and judging the failure type of the aggregate and the asphalt according to the normal force F-stretching displacement d curve graph.
9. The aggregate and bitumen tensile failure assessment method of claim 1, further comprising:
according to the critical thickness Judging the failure type of the aggregate and asphalt to be evaluated, and when the target thickness/>When the tensile failure type of the aggregate to be evaluated and the asphalt is adhesion failure of an asphalt-aggregate interface;
When the target thickness is And when the tensile failure type of the aggregate and the asphalt to be evaluated is cohesive failure of the asphalt.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111491901.1A CN114034562B (en) | 2021-12-08 | 2021-12-08 | Aggregate and asphalt tensile failure evaluation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111491901.1A CN114034562B (en) | 2021-12-08 | 2021-12-08 | Aggregate and asphalt tensile failure evaluation method |
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| Publication Number | Publication Date |
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| CN114034562A CN114034562A (en) | 2022-02-11 |
| CN114034562B true CN114034562B (en) | 2024-04-19 |
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