Epoxy asphalt cement rheological property testing method based on solid shearing clamp

Abstract

The invention discloses an epoxy asphalt cement rheological property testing method based on a solid shearing clamp. The epoxy asphalt cement rheological property testing method comprises the following steps: preparing a cylindrical epoxy asphalt cement sample; adhering stainless steel rings to two ends of the sample; placing the sample with the stainless steel ring in a solid shear clamp of a dynamic shear rheometer; carrying out rheological test temperature control on the solid shearing clamp by utilizing a heat preserving furnace; and testing the rheological property of the sample by adopting a dynamic shear rheometer. When the sample is prepared, the epoxy resin main agent and the curing agent are subjected to heat preservation, mixed and sheared according to a preset proportion and then mixed and sheared with asphalt heated to a flowing state according to a preset proportion to obtain the epoxy asphalt cementing material, and the epoxy asphalt cementing material is injected into a cylindrical silicone tube to be cured and then taken out. According to the method, the technical problem that the existing epoxy asphalt cement rheological property testing method is inaccurate and incomplete is solved, the rheological properties of the epoxy asphalt cement at different temperatures and frequencies can be accurately evaluated, and a scientific basis is provided for formula design and performance optimization of the epoxy asphalt cement.

Description

Technical Field

[0001] The present invention relates to the technical field of epoxy asphalt material performance testing, and in particular to a method for testing the rheological properties of an epoxy asphalt binder based on a solid shear fixture. Background Art

[0002] Steel bridges, due to their light weight, high strength, and excellent mechanical properties, are increasingly being used in bridge construction, especially for long-span bridges. Steel bridge deck pavement places extremely high demands on the paving material's high-temperature stability, fatigue resistance, and adhesion to the steel plate. Over the years, through continuous exploration, experimentation, practice, and summarization, my country's road academic and engineering communities have discovered that epoxy asphalt mixtures are one of the most successful pavement materials used in my country to date. Their superior properties, such as high stiffness and high-temperature stability, are attributed to their epoxy asphalt binder. Epoxy asphalt is a resin-based asphalt prepared by adding a base epoxy resin (Component A) and a curing agent (Component B) to a base asphalt. After curing, the epoxy resin in the epoxy asphalt forms a three-dimensional network structure, while the asphalt is distributed within the resin network as spherical fillers. The two components work together: the epoxy resin, as the continuous phase, provides a network structure that remains unsoftened at high temperatures, while the asphalt, as the dispersed phase, provides flexibility and elasticity at low temperatures. Obtaining the rheological properties parameters of epoxy asphalt can accurately evaluate the high-temperature performance and fatigue performance of epoxy asphalt, thereby further providing a reference basis for the material design of epoxy asphalt mixtures, which has important practical application value.

[0003] For example, CN105136557A discloses an "Asphalt Dynamic Shear Parameter Testing Device and Method." This method, by installing a detachable fixture on a parallel plate base, can analyze the influence of temperature and frequency factors on the dynamic viscoelastic parameters of asphalt binder under aggregate contact conditions. CN102507378A discloses an "Improved Dynamic Shear Rheometer Fixture and Testing Method." This invention improves the fixture of a dynamic shear rheometer, allowing a test piece made of mineral material to be fixed to the fixture with screws, thereby enabling rheological property testing of asphalt binder based on a real mineral surface.

[0004] Regarding the study of asphalt binder interface properties, CN107843504A proposes a "Method for Testing Aggregate-Mortar Weak Boundary Layer Properties Based on Dynamic Shear Rheology Testing." This method characterizes the weak boundary layer properties of the aggregate-mortar interface by adhering a rock substrate to the upper and lower substrates of a dynamic shear rheometer and testing the dynamic shear complex modulus of mortar specimens of varying thicknesses. CN113376361A discloses a "Method for Testing Internal Stress that Drives Recovery and Healing of Asphalt Binders." This method, relying on a dynamic shear rheometer, measures the internal stress of the asphalt binder during its recovery phase after loading, providing a new physical quantity for characterizing the self-healing properties of asphalt binders.

[0005] In terms of epoxy asphalt materials, CN115246997A discloses "an epoxy asphalt binder for recycling old asphalt materials and its preparation method". This invention forms an epoxy asphalt solid colloidal material with both certain strength and certain deformation ability through the cross-linking and interweaving effect of the raw materials during the curing reaction. After the epoxy asphalt is cured, it becomes a solid material that can no longer be liquefied or softened, thereby improving the bonding ability and high temperature resistance of the pavement interface.

[0006] Traditional rheological testing of asphalt binders primarily utilizes a dynamic shear rheometer with a parallel plate mold. Unlike thermoplastic asphalt, epoxy asphalt exhibits pronounced thermosetting properties. Once the curing reaction is complete, the specimen will not adhere to the parallel plate mold surface like asphalt, even at elevated temperatures. Furthermore, compression and scraping of excess specimens to form a uniformly sized parallel plate specimen are impossible. Therefore, a new rheological testing method is needed to determine the rheological properties of epoxy asphalt binders. Summary of the Invention

[0007] The technical problem to be solved by the present invention is that the rheological properties of traditional asphalt binder are mainly tested using the parallel plate mold of a dynamic shear rheometer, but epoxy asphalt has the characteristics of thermosetting. After solidification, it cannot adhere to the surface of the parallel plate mold like ordinary asphalt, nor can it be compressed or scraped off excess test pieces to form parallel plate specimens of uniform size, resulting in the defect that the rheological properties of epoxy asphalt binder cannot be effectively tested. A method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture is provided.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] The present invention provides a method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture, comprising the following steps:

[0010] Prepare cylindrical epoxy asphalt binder samples;

[0011] gluing stainless steel rings at both ends of the cylindrical epoxy asphalt binder sample;

[0012] A cylindrical epoxy asphalt binder sample with a stainless steel ring was placed in the solid shear fixture of the dynamic shear rheometer;

[0013] Performing rheological testing on the solid shear fixture by controlling the temperature using a heat preservation furnace;

[0014] The dynamic shear rheometer was used to test the rheological properties of the cylindrical epoxy asphalt binder sample with a stainless steel ring.

[0015] Furthermore, the process of preparing a cylindrical epoxy asphalt binder sample specifically includes the following steps:

[0016] Place the epoxy resin main agent and curing agent in an oven to keep warm;

[0017] The asphalt is heated in an oven until it becomes fluid;

[0018] The heat-insulated epoxy resin main agent and the curing agent are mixed in a preset mass ratio, and continuously sheared at room temperature for a first preset time using a high-speed shearing machine;

[0019] The matrix asphalt in a flowing state is mixed with the sheared epoxy resin in a preset mass ratio, and sheared continuously using a high-speed shearing machine for a second preset time to obtain an epoxy asphalt binder;

[0020] The epoxy asphalt binder is injected into a cylindrical silicone tube. The silicone tube containing the sample is placed in an oven for full curing, and then the sample is taken out of the silicone tube to obtain a cylindrical epoxy asphalt binder sample.

[0021] Furthermore, the solid shear fixture is a standard configuration fixture of a dynamic shear rheometer.

[0022] Furthermore, the insulation temperature of the epoxy resin main agent and the curing agent in the oven is 50-70°C, and the heating temperature of the asphalt is 140-200°C.

[0023] Furthermore, in the process of mixing the heat-insulated epoxy resin main agent and the curing agent according to a preset mass ratio, the mass mixing ratio of the epoxy resin main agent and the curing agent is 50-60:40-50, and the rotation speed of the high-speed shearing machine is 1300-1700 rpm.

[0024] Furthermore, in the process of mixing the flowing matrix asphalt and the sheared epoxy resin according to a preset mass ratio, the mass mixing ratio of the matrix asphalt and the epoxy resin is 1:1, the rotation speed of the high-speed shearing machine is 2500-3500rpm, and the shearing temperature is 140-180°C.

[0025] Furthermore, the step of gluing stainless steel rings at both ends of the cylindrical epoxy asphalt binder sample includes: cutting off both ends of the cylindrical epoxy asphalt binder sample, retaining the middle area, and using cyanoacrylate universal glue to gluing stainless steel rings at both ends of the cut sample.

[0026] Furthermore, the retained height of the cut sample is 18 to 22 mm, the inner diameter of the stainless steel ring (2) is 6 to 10 mm, the height is 2 to 4 mm, and the adhesive material is cyanoacrylate universal glue.

[0027] Furthermore, the cylindrical silicone tube has an inner diameter of 6 to 10 mm, an outer diameter of 8 to 12 mm, and a height of 30 to 50 mm;

[0028] The silicone tube containing the sample was placed in an oven for full curing. The oven curing temperature was 60°C and the curing time was 4 days.

[0029] Furthermore, the first preset time and the second preset time are 5 minutes and 15 minutes respectively.

[0030] Furthermore, the specific steps of controlling the temperature of the solid shear fixture for rheological testing using a heat preservation furnace include:

[0031] A cylindrical epoxy asphalt binder sample with a stainless steel ring was installed and fixed in the solid shear fixture of the dynamic shear rheometer;

[0032] According to the test requirements, the target test temperature is set through the temperature control system of the holding furnace, and then the holding furnace is turned on to heat or keep the solid shear fixture and specimen warm. During the heating process, the heating elements in the holding furnace will evenly transfer heat to the fixture and specimen.

[0033] The internal temperature of the fixture is monitored in real time by a built-in temperature sensor, which feeds the temperature signal back to the temperature control system. The temperature control system compares and analyzes the feedback information with the set target temperature and automatically adjusts the heating power. When the temperature reaches the set value, it enters the insulation state until the test is completed.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] This method solves the problem of ineffective adhesion of epoxy asphalt binder using parallel plate molds by preparing cylindrical specimens and using a solid shear fixture as the test mold. This allows for accurate and efficient acquisition of the rheological properties of epoxy asphalt binder. Stainless steel rings are glued to both ends of the specimen to prevent stress concentration during loading and compression deformation at both ends. The test instrument used is a dynamic shear rheometer, consistent with conventional asphalt testing. The solid shear fixture used is the built-in fixture of the dynamic shear rheometer, eliminating the need for custom customization. This makes the test simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the silicone tube used in the present invention;

[0037] Figure 2 This is a schematic diagram of the epoxy asphalt sample formed by the present invention;

[0038] Figure 3 Schematic diagram of the rheological properties test of the epoxy asphalt binder designed for the present invention.

[0039] In the figure: 1 is a cylindrical silicone tube, 2 is a stainless steel ring, 3 is an epoxy asphalt binder sample, and 4 is a solid shear fixture. DETAILED DESCRIPTION

[0040] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. Any features, such as preparation methods, materials, structures, or composition ratios, not explicitly described in this technical solution are considered common technical features disclosed in the prior art. Any features, such as component models, material names, connection structures, circuit structures, control methods, algorithms, etc., not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0041] Example 1

[0042] A method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture comprises the following steps:

[0043] Step 1: Prepare a cylindrical epoxy asphalt binder sample 3.

[0044] The epoxy resin main agent and curing agent are placed in an oven and kept warm at 60°C; at the same time, the asphalt is placed in an oven and heated to a fluid state at 170°C.

[0045] The heat-insulated epoxy resin main agent and curing agent were mixed in a mass ratio of 55:45, and sheared continuously for 5 minutes at room temperature using a high-speed shearing machine with a shearing machine speed of 1500 rpm.

[0046] The flowing matrix asphalt and the sheared epoxy resin were mixed in a mass ratio of 1:1, and sheared continuously for 15 minutes using a high-speed shearing machine at a shearing temperature of 160°C and a shearing machine speed of 3000 rpm to obtain an epoxy asphalt binder.

[0047] Epoxy asphalt binder was injected into a cylindrical silicone tube 1 with an inner diameter of 8 mm, an outer diameter of 10 mm, and a height of 40 mm. The sample was then placed in an oven for curing at 60°C for four days. After curing, the sample was removed from the tube to obtain a cylindrical epoxy asphalt binder sample 3.

[0048] Step 2: Glue stainless steel rings 2 at both ends of the cylindrical epoxy asphalt binder sample 3.

[0049] The ends of the cylindrical epoxy asphalt binder sample 3 were cut off, leaving the middle region. The remaining height of the cut sample was 20 mm. Stainless steel rings 2 with an inner diameter of 8 mm and a height of 3 mm were glued to both ends of the cut sample using cyanoacrylate universal glue.

[0050] Step 3: Place the cylindrical epoxy asphalt binder sample 3 with the stainless steel ring 2 in the solid shear fixture 4 of the dynamic shear rheometer.

[0051] The solid shear fixture 4 is a standard fixture of the dynamic shear rheometer. A cylindrical epoxy asphalt binder sample 3 with a stainless steel ring 2 is installed and fixed in the solid shear fixture 4 of the dynamic shear rheometer.

[0052] Step 4: Use a heat preservation furnace to control the temperature of the solid shear fixture 4 for rheological testing.

[0053] According to the test requirements, the target test temperature is set through the temperature control system of the insulation furnace, and then the insulation furnace is turned on to heat or keep the solid shear fixture 4 and the sample warm. During the heating process, the heating elements in the insulation furnace will evenly transfer heat to the fixture and the sample.

[0054] The internal temperature of the fixture is monitored in real time by a built-in temperature sensor, which feeds the temperature signal back to the temperature control system. The temperature control system compares and analyzes the feedback information with the set target temperature and automatically adjusts the heating power. When the temperature reaches the set value, it enters the insulation state until the test is completed.

[0055] Step 5: Use a dynamic shear rheometer to test the rheological properties of the cylindrical epoxy asphalt binder sample 3 with a stainless steel ring 2.

[0056] By applying shear stress or shear strain to the sample through a dynamic shear rheometer, the rheological parameters of the sample at different temperatures, frequencies or stress levels, such as complex modulus, phase angle, viscosity, etc., are measured to comprehensively evaluate the rheological properties of epoxy asphalt binder.

[0057] Example 2

[0058] A method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture comprises the following steps:

[0059] Step 1: Prepare a cylindrical epoxy asphalt binder sample 3.

[0060] The epoxy resin main agent and curing agent are placed in an oven and kept warm at 50°C; at the same time, the asphalt is placed in an oven and heated to a fluid state at 140°C.

[0061] The heat-insulated epoxy resin main agent and curing agent were mixed in a mass ratio of 50:50, and sheared continuously for 5 minutes at room temperature using a high-speed shearing machine with a shearing machine speed of 1300 rpm.

[0062] The flowing matrix asphalt and the sheared epoxy resin were mixed in a mass ratio of 1:1, and sheared continuously for 15 minutes using a high-speed shearing machine at a shearing temperature of 140°C and a shearing machine speed of 2500 rpm to obtain an epoxy asphalt binder.

[0063] Epoxy asphalt binder was injected into a cylindrical silicone tube (1) with an inner diameter of 6 mm, an outer diameter of 8 mm, and a height of 30 mm. The tube containing the sample was placed in an oven for curing at 60°C for 4 days. After curing, the sample was removed from the tube to obtain a cylindrical epoxy asphalt binder sample (3).

[0064] Step 2: Glue stainless steel rings 2 at both ends of the cylindrical epoxy asphalt binder sample 3.

[0065] The ends of the cylindrical epoxy asphalt binder sample 3 were cut off, leaving the middle region. The remaining height of the cut sample was 18 mm. Stainless steel rings 2 with an inner diameter of 6 mm and a height of 2 mm were glued to both ends of the cut sample using cyanoacrylate universal glue.

[0066] Step 3: Place the cylindrical epoxy asphalt binder sample 3 with the stainless steel ring 2 in the solid shear fixture 4 of the dynamic shear rheometer.

[0067] The solid shear fixture 4 is a standard fixture of the dynamic shear rheometer. A cylindrical epoxy asphalt binder sample 3 with a stainless steel ring 2 is installed and fixed in the solid shear fixture 4 of the dynamic shear rheometer.

[0068] Step 4: Use a heat preservation furnace to control the temperature of the solid shear fixture 4 for rheological testing.

[0069] According to the test requirements, the target test temperature is set through the temperature control system of the insulation furnace, and then the insulation furnace is turned on to heat or keep the solid shear fixture 4 and the sample warm. During the heating process, the heating elements in the insulation furnace will evenly transfer heat to the fixture and the sample.

[0070] The internal temperature of the fixture is monitored in real time by a built-in temperature sensor, which feeds the temperature signal back to the temperature control system. The temperature control system compares and analyzes the feedback information with the set target temperature and automatically adjusts the heating power. When the temperature reaches the set value, it enters the insulation state until the test is completed.

[0071] Step 5: Use a dynamic shear rheometer to test the rheological properties of the cylindrical epoxy asphalt binder sample 3 with a stainless steel ring 2.

[0072] By applying shear stress or shear strain to the sample through a dynamic shear rheometer, the rheological parameters of the sample at different temperatures, frequencies or stress levels, such as complex modulus, phase angle, viscosity, etc., are measured to comprehensively evaluate the rheological properties of epoxy asphalt binder.

[0073] Example 3

[0074] A method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture comprises the following steps:

[0075] Step 1: Prepare a cylindrical epoxy asphalt binder sample 3.

[0076] The epoxy resin main agent and curing agent are placed in an oven and kept warm at 70°C; at the same time, the asphalt is placed in an oven and heated to a fluid state at 200°C.

[0077] The heat-insulated epoxy resin main agent and curing agent were mixed in a mass ratio of 60:40, and sheared continuously for 5 minutes at room temperature using a high-speed shearing machine with a shearing machine speed of 1700 rpm.

[0078] The flowing matrix asphalt and the sheared epoxy resin were mixed in a mass ratio of 1:1, and sheared continuously for 15 minutes using a high-speed shearing machine at a shearing temperature of 180°C and a shearing machine speed of 3500 rpm to obtain an epoxy asphalt binder.

[0079] Epoxy asphalt binder was injected into a cylindrical silicone tube (1) with an inner diameter of 10 mm, an outer diameter of 12 mm, and a height of 50 mm. The tube containing the sample was placed in an oven for curing at 60°C for four days. After curing, the sample was removed from the tube to obtain a cylindrical epoxy asphalt binder sample (3).

[0080] Step 2: Glue stainless steel rings 2 at both ends of the cylindrical epoxy asphalt binder sample 3.

[0081] The ends of the cylindrical epoxy asphalt binder sample 3 were cut off, leaving the middle region. The remaining height of the cut sample was 22 mm. Stainless steel rings 2 with an inner diameter of 10 mm and a height of 4 mm were glued to both ends of the cut sample using cyanoacrylate universal adhesive.

[0082] Step 3: Place the cylindrical epoxy asphalt binder sample 3 with the stainless steel ring 2 in the solid shear fixture 4 of the dynamic shear rheometer.

[0083] The solid shear fixture 4 is a standard fixture of the dynamic shear rheometer. A cylindrical epoxy asphalt binder sample 3 with a stainless steel ring 2 is installed and fixed in the solid shear fixture 4 of the dynamic shear rheometer.

[0084] Step 4: Use a heat preservation furnace to control the temperature of the solid shear fixture 4 for rheological testing.

[0085] According to the test requirements, the target test temperature is set through the temperature control system of the insulation furnace, and then the insulation furnace is turned on to heat or keep the solid shear fixture 4 and the sample warm. During the heating process, the heating elements in the insulation furnace will evenly transfer heat to the fixture and the sample.

[0086] The internal temperature of the fixture is monitored in real time by a built-in temperature sensor, which feeds the temperature signal back to the temperature control system. The temperature control system compares and analyzes the feedback information with the set target temperature and automatically adjusts the heating power. When the temperature reaches the set value, it enters the insulation state until the test is completed.

[0087] Step 5: Use a dynamic shear rheometer to test the rheological properties of the cylindrical epoxy asphalt binder sample 3 with a stainless steel ring 2.

[0088] By applying shear stress or shear strain to the sample through a dynamic shear rheometer, the rheological parameters of the sample at different temperatures, frequencies or stress levels, such as complex modulus, phase angle, viscosity, etc., are measured to comprehensively evaluate the rheological properties of epoxy asphalt binder.

[0089] It should be noted that Example 1, Example 2, and Example 3 are all a method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture 4.

[0090] Comparative Example 1

[0091] This comparative example uses a parallel plate fixture without a stainless steel ring.

[0092] Sample preparation: The epoxy asphalt binder was prepared according to the steps of Example 1, but was directly poured into the parallel plate mold without forming it into a cylindrical sample.

[0093] Post-curing treatment: After curing, attempts were made to scrape off excess specimens to form standard parallel plate specimens. However, due to the thermosetting nature of epoxy asphalt, the specimens could not be softened and could not be scraped flat.

[0094] Test method: The cured epoxy asphalt specimen was clamped in the parallel plate fixture of the dynamic shear rheometer without using a stainless steel ring.

[0095] Test results:

[0096] The contact surface between the specimen and the parallel plate fixture cannot be effectively adhered, and slippage occurs during loading, resulting in large fluctuations in the complex modulus test value (the error exceeds 50%).

[0097] Because there is no stainless steel ring support at both ends of the specimen, local compression deformation occurs under shear stress, and the phase angle data is abnormal (deviating from the normal range by more than 20%).

[0098] The test was interrupted several times due to sample falling off, and the complete rheological curve test could not be completed.

[0099] Comparison conclusion:

[0100] Traditional parallel plate fixtures are not suitable for the adhesion requirements of thermosetting epoxy asphalt specimens, and the lack of stainless steel rings can lead to stress concentration and deformation. This invention completely solves these problems by combining a cylindrical specimen with a solid shear fixture and a stainless steel ring.

[0101] Comparative Example 2

[0102] This comparative example used a cylindrical specimen but without a stainless steel ring.

[0103] Sample preparation: A cylindrical epoxy asphalt binder sample was prepared according to the steps of Example 1 of the present invention, but without gluing stainless steel rings at both ends.

[0104] Test method: The sample is clamped directly in the solid shear fixture of the dynamic shear rheometer, and the fixture applies normal pressure to fix the sample.

[0105] Test results:

[0106] Because both ends of the specimen directly contact the metal surface of the fixture, plastic deformation occurs under normal pressure (compression reaches 0.5 mm), resulting in a reduction in the effective height of the specimen and a high complex modulus test value.

[0107] During shear loading, microcracks are generated on the contact surface between the specimen and the fixture due to stress concentration, and the phase angle data increases significantly in the later stage of the test (a characteristic of fatigue failure).

[0108] After repeated testing three times, the samples all broke and stable rheological parameters could not be obtained.

[0109] Comparison conclusion:

[0110] Specimens without stainless steel rings can suffer from stress concentration and end deformation during loading, leading to data distortion and specimen damage. This invention uses stainless steel rings to disperse stress and protect the specimen ends, significantly improving test stability and accuracy.

[0111] Comparative Example 3

[0112] This comparative example uses a non-standard custom fixture.

[0113] Fixture design: Design a non-standard fixture, which requires an additional customized metal fixture with a threaded locking structure to clamp the cylindrical epoxy asphalt specimen (threaded holes need to be pre-embedded at both ends of the specimen).

[0114] Sample preparation: Prepare the sample according to the steps of Example 1 of the present invention, but before curing, embed metal pre-embedded parts at both ends of the sample to match the fixture thread structure.

[0115] Test method: The specimen was fixed in a custom fixture by thread and tested using a dynamic shear rheometer.

[0116] Test results:

[0117] The interface between the embedded parts and the epoxy asphalt peeled off under shear stress (due to the difference in material stiffness), resulting in an abnormal decrease in the complex modulus value in the test.

[0118] The fixture needs to be frequently disassembled to clean the threads, and the single test time is extended to 2 hours (Example 1 of the present invention only takes 30 minutes).

[0119] Comparison conclusion:

[0120] Non-standard custom fixtures introduce the risk of embedded part interface failure, are complex to operate, and are costly. This invention directly uses the standard solid shear fixture of the dynamic shear rheometer, eliminating the need to modify the specimen or fixture, achieving low-cost, high-efficiency testing.

[0121] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture, characterized in that: The following steps are involved: Prepare cylindrical epoxy asphalt binder samples; gluing stainless steel rings at both ends of the cylindrical epoxy asphalt binder sample; A cylindrical epoxy asphalt binder sample with a stainless steel ring was placed in the solid shear fixture of the dynamic shear rheometer; Performing rheological testing on the solid shear fixture by controlling the temperature using a heat preservation furnace; The dynamic shear rheometer was used to test the rheological properties of the cylindrical epoxy asphalt binder sample with a stainless steel ring.

2. The method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture according to claim 1, characterized in that: The process of preparing cylindrical epoxy asphalt binder samples specifically includes the following steps: Place the epoxy resin main agent and curing agent in an oven to keep warm; The asphalt is heated in an oven until it becomes fluid; The heat-insulated epoxy resin main agent and the curing agent are mixed in a preset mass ratio, and continuously sheared at room temperature for a first preset time using a high-speed shearing machine; The matrix asphalt in a flowing state is mixed with the sheared epoxy resin in a preset mass ratio, and sheared continuously using a high-speed shearing machine for a second preset time to obtain an epoxy asphalt binder; The epoxy asphalt binder is injected into a cylindrical silicone tube. The silicone tube containing the sample is placed in an oven for full curing, and then the sample is taken out of the silicone tube to obtain a cylindrical epoxy asphalt binder sample.

3. The method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture according to claim 1, characterized in that: The solid shear fixture is a standard configuration fixture of the dynamic shear rheometer; The insulation temperature of the epoxy resin main agent and the curing agent in the oven is 50-70°C, and the heating temperature of the asphalt is 140-200°C.

4. The method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture according to claim 2, wherein: In the process of mixing the heat-insulated epoxy resin main agent and the curing agent according to a preset mass ratio, the mass mixing ratio of the epoxy resin main agent and the curing agent is 50-60:40-50, and the rotation speed of the high-speed shearing machine is 1300-1700 rpm.

5. The method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture according to claim 2, wherein: In the process of mixing the flowing matrix asphalt and the sheared epoxy resin according to a preset mass ratio, the mass mixing ratio of the matrix asphalt and the epoxy resin is 1:1, the rotation speed of the high-speed shearing machine is 2500-3500rpm, and the shearing temperature is 140-180°C.

6. The method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture according to claim 1, characterized in that: The step of gluing stainless steel rings at both ends of the cylindrical epoxy asphalt binder sample includes: cutting off both ends of the cylindrical epoxy asphalt binder sample, retaining the middle area, and using cyanoacrylate universal glue to gluing stainless steel rings at both ends of the cut sample.

7. The method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture according to claim 6, characterized in that: The retained height of the cut sample is 18-22 mm, the inner diameter of the stainless steel ring (2) is 6-10 mm, the height is 2-4 mm, and the adhesive material is cyanoacrylate universal glue.

8. The method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture according to claim 1, wherein: The cylindrical silicone tube has an inner diameter of 6 to 10 mm, an outer diameter of 8 to 12 mm, and a height of 30 to 50 mm; The silicone tube containing the sample was placed in an oven for full curing. The oven curing temperature was 60°C and the curing time was 4 days.

9. The method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture according to claim 2, wherein: The first preset time and the second preset time are 5 minutes and 15 minutes respectively.

10. The method for testing the rheological properties of epoxy asphalt binder based on a solid shear fixture according to claim 1, characterized in that: The specific steps of using a heat preservation furnace to control the temperature of the solid shear fixture for rheological testing include: A cylindrical epoxy asphalt binder sample with a stainless steel ring was installed and fixed in the solid shear fixture of the dynamic shear rheometer; According to the test requirements, the target test temperature is set through the temperature control system of the holding furnace, and then the holding furnace is turned on to heat or keep the solid shear fixture and specimen warm. During the heating process, the heating elements in the holding furnace will evenly transfer heat to the fixture and specimen. The internal temperature of the fixture is monitored in real time by a built-in temperature sensor, which feeds the temperature signal back to the temperature control system. The temperature control system compares and analyzes the feedback information with the set target temperature and automatically adjusts the heating power. When the temperature reaches the set value, it enters the insulation state until the test is completed.

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