Device and method for testing asphalt mixture melting snow under simulated real service environment

Abstract

The application discloses a kind of asphalt mixture ice and snow melting test device under simulating real service environment, in the asphalt mixture ice and snow melting test device under simulating real service environment, top plate is detachably closed connection with the top end of organic glass cavity;Piston pull rod extends into organic glass cavity through top plate;Piston is connected with the bottom end of piston pull rod and movable relative to the inner wall of organic glass cavity;Bottom plate is detachably closed connection with the bottom end of organic glass cavity;Asphalt mixture test piece is arranged in organic glass cavity and is supported on bottom plate;Water injection and drainage hole is arranged in the side wall of organic glass cavity;Water injection and drainage pipe is connected with water injection and drainage hole through water injection and drainage valve;Chloride ion tester is connected with organic glass cavity to measure the chloride ion concentration of water therein;Pressure gauge is connected with organic glass cavity through pressure water pipe to measure the pressure data of water therein;Exhaust hole is arranged through piston to form exhaust passage.The test device can accurately measure the long-term performance of ice and snow melting of asphalt pavement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of asphalt road, in particular to a device and method for simulating ice and snow melting of asphalt mixture under real service environment. BACKGROUND

[0002] The existing technology mainly uses immersion method, accelerated immersion method or flushing method to test and evaluate the long-term performance of ice and snow melting of anti-ice and snow asphalt mixture, which cannot simulate the water-load-temperature coupling effect under the service state of the road surface, cannot truly reflect the release process of the effective components of anti-ice and snow asphalt mixture, and thus cannot effectively evaluate the long-term performance of ice and snow melting of anti-ice and snow asphalt pavement.

[0003] The above information disclosed in the background section is only used to enhance the understanding of the background of the present application, and thus can include information that is not prior art known to those of ordinary skill in the art. SUMMARY

[0004] The present application aims to provide a device and method for simulating ice and snow melting of asphalt mixture under real service environment, which can simulate the release process of the effective components of anti-ice and snow asphalt mixture under water-temperature-load coupling effect, effectively evaluate the long-term performance of ice and snow melting of anti-ice and snow asphalt mixture, and find out a gradation type that is beneficial to the performance of ice and snow melting of asphalt mixture through analyzing the influence of gradation type on the release process of effective components of low-freezing-point filler in asphalt mixture, so as to realize the material optimization of anti-ice and snow asphalt pavement.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] The device for simulating ice and snow melting of asphalt mixture under real service environment comprises:

[0007] A plexiglass cavity, which is a hollow structure with open ends;

[0008] A top plate, which is detachably connected to the top end of the plexiglass cavity;

[0009] A piston pull rod, which extends through the top plate into the plexiglass cavity;

[0010] A piston, which is connected to the bottom end of the piston pull rod and is movable relative to the inner wall of the plexiglass cavity;

[0011] A bottom plate, which is detachably connected to the bottom end of the plexiglass cavity;

[0012] An asphalt mixture test piece, which is arranged in the plexiglass cavity and is supported on the bottom plate;

[0013] A water injection and drainage hole is arranged on the side wall of the organic glass cavity;

[0014] A water injection and drainage pipe is connected to the water injection and drainage hole through a water injection and drainage valve;

[0015] A chloride ion tester is connected to the organic glass cavity to measure the chloride ion concentration of the water therein;

[0016] A pressure gauge is connected to the organic glass cavity through a pressure water pipe to measure the pressure data of the water therein;

[0017] An exhaust hole is arranged through the piston to form an exhaust passage, and the exhaust passage is provided with an exhaust valve.

[0018] In the asphalt mixture ice and snow melting test device simulating real service environment, the top end of the piston pull rod is provided with a first connecting piece, the bottom plate is provided with a second connecting piece, and the first connecting piece is detachably connected to the loading machine.

[0019] In the asphalt mixture ice and snow melting test device simulating real service environment, the first connecting piece has an upper thread, and the second connecting piece has a lower thread.

[0020] In the asphalt mixture ice and snow melting test device simulating real service environment, the top plate is detachably connected to the organic glass cavity through an upper end connecting piece, and the bottom plate is detachably connected to the organic glass cavity through a lower end connecting piece.

[0021] In the asphalt mixture ice and snow melting test device simulating real service environment, the upper end connecting piece and the lower end connecting piece include a bolt structure.

[0022] In the asphalt mixture ice and snow melting test device simulating real service environment, the top end of the organic glass cavity is provided with a silica gel piece at the connection with the top plate, and the bottom end of the organic glass cavity is provided with a silica gel piece at the connection with the bottom plate.

[0023] In the asphalt mixture ice and snow melting test device simulating real service environment, the piston is provided with a rubber ring around the piston to seal the inner wall of the organic glass cavity.

[0024] In the asphalt mixture ice and snow melting test device simulating real service environment, the inner wall of the area of the organic glass cavity accommodating the asphalt mixture test piece is provided with a sealing layer.

[0025] In the asphalt mixture ice and snow melting test device simulating real service environment, the water injection and drainage pipe is provided with an automatic drainage device and a temperature adjusting device.

[0026] The test method of the asphalt mixture ice and snow melting test device simulating real service environment includes the following steps:

[0027] Step one, determine the annual rainfall frequency, annual average rainfall and daily rainfall distribution in real service environment, based on average rainfall and daily rainfall distribution and temperature data to divide test conditions;

[0028] Step two, prepare the asphalt mixture test piece into Marshall test piece, seal the Marshall test piece around and the bottom surface with glue to simulate the pavement service state;

[0029] Step three, put the Marshall test piece into the test device and connect the test device with the loading machine;

[0030] Step four, add the determined single water consumption and the Marshall test piece in the environmental box for a predetermined time, then add the Marshall test piece surface through the injection and drainage pipe connected with the injection and drainage hole, then adjust the piston height to the liquid surface position, close the exhaust hole, adjust the loading machine frequency to simulate the pavement service state at this temperature;

[0031] Step five, after the single test is completed, record the chloride ion concentration of the water measured by the chloride ion tester, and discharge the water in the organic glass cavity through the drainage device and collect it into the container;

[0032] Step six, repeat the operation of steps four and five until the chloride ion concentration is close to 0, and record the chloride ion concentration test result and the test number after each test is completed;

[0033] Step seven, convert the test number into service life according to the annual rainfall frequency to predict the long-term performance of the ice and snow melting asphalt mixture.

[0034] In the above technical scheme, the asphalt mixture ice and snow melting test device provided by the application has the following beneficial effects: the position of the piston is adjusted to realize the pressurization and "pumping" effect of the wheel load, and the test is assisted by the loading test machine, so that the loading frequency and loading environment of the test can be controlled, and the operation is simple and accurate; the application can simulate the actual service environment of the pavement, realize the monitoring of the release process of the ice and snow melting effective component under the water-temperature-load coupling effect, and effectively predict the service life of the ice and snow melting asphalt pavement according to the conversion formula. The application can monitor the change of the chloride ion release concentration in the container in real time, which has guiding significance for understanding the release law of the ice and snow melting effective component of the asphalt mortar, and the application can analyze the influence law of the gradation type on the release process of the ice and snow melting effective component in the asphalt mixture through test data, so as to find out a gradation type that is beneficial to the ice and snow melting performance of the asphalt mixture, and realize the material optimization of the ice and snow resistant asphalt pavement. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below only represent some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art based on these drawings belong to the scope of the present application.

[0036] Fig. 1 A structural schematic diagram of a simulated real service environment asphalt mixture ice and snow melting test device provided by the embodiment of the present application.

[0037] Fig. 2 A structural schematic diagram of a simulated real service environment asphalt mixture ice and snow melting test device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the present application.

[0039] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the present application.

[0040] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0042] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply any relative importance or any meaning pertaining to the quantity of the features indicated. Thus, a feature defined with "first", "second", etc. can include one or more of the features implicitly or explicitly. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise explicitly specified and limited.

[0043] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical and oblique above of the first feature to the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical and oblique below of the first feature to the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0045] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0046] Reference Figs. 1-2 As shown in one embodiment, the asphalt mixture ice and snow melting test device in a real service environment of the present application comprises,

[0047] The plexiglass cavity 6 is a hollow structure with both ends open;

[0048] The top plate 3 is detachably connected to the top end of the plexiglass cavity 6;

[0049] The piston pull rod 2 extends through the top plate 3 into the plexiglass cavity 6;

[0050] The piston 4 is connected to the bottom end of the piston pull rod 2 and is movable relative to the inner wall of the plexiglass cavity 6;

[0051] The bottom plate 10 is detachably connected to the bottom end of the plexiglass cavity 6;

[0052] an asphalt mixture test piece 12 disposed in the plexiglass cavity 6 and carried on the base plate 10;

[0053] a water injection hole 13 disposed in the side wall of the plexiglass cavity 6;

[0054] a water injection pipe 20 connected to the water injection hole 13 through a water injection valve 14;

[0055] a chloride ion tester 15 connected to the plexiglass cavity 6 to measure the chloride ion concentration of the water 16 therein;

[0056] a pressure gauge 8 connected to the plexiglass cavity 6 through a pressure water pipe 7 to measure the pressure data of the water 16 therein;

[0057] an exhaust hole 17 disposed through the piston 4 to form an exhaust passage, the exhaust passage being provided with an exhaust valve 18.

[0058] The present application is to solve the problem that the existing indoor test equipment cannot accurately simulate the release process of the effective component of snow-melting agent for anti-icing and snow asphalt pavement under the action of water-temperature-load, and cannot accurately predict the duration of the ice-melting and snow-melting performance of anti-icing and snow asphalt pavement, and to find out a gradation type that is beneficial to the ice-melting and snow-melting performance of asphalt mixture, so as to realize the material optimization of anti-icing and snow asphalt pavement.

[0059] In the preferred embodiment of the asphalt mixture ice-melting and snow-melting test device simulating the real service environment, the top end of the piston pull rod 2 is provided with a first connecting piece, the base plate 10 is provided with a second connecting piece, and the first connecting piece is detachably connected to the loading machine.

[0060] In the preferred embodiment of the asphalt mixture ice-melting and snow-melting test device simulating the real service environment, the first connecting piece has an upper thread 1, and the second connecting piece has a lower thread 11.

[0061] In the preferred embodiment of the asphalt mixture ice-melting and snow-melting test device simulating the real service environment, the top plate 3 is detachably connected to the plexiglass cavity 6 through an upper end connecting piece 19, and the base plate 10 is detachably connected to the plexiglass cavity 6 through a lower end connecting piece.

[0062] In the preferred embodiment of the asphalt mixture ice-melting and snow-melting test device simulating the real service environment, the upper end connecting piece 19 and the lower end connecting piece include a bolt structure.

[0063] The preferred embodiment of the asphalt mixture ice and snow melting test device simulating real service environment has silica gel sheets at the connection between the top end of the organic glass cavity 6 and the top plate 3 and at the connection between the bottom end of the organic glass cavity 6 and the bottom plate 10.

[0064] The preferred embodiment of the asphalt mixture ice and snow melting test device simulating real service environment has rubber rings 5 sealingly contacting the inner wall of the organic glass cavity 6 around the piston 4.

[0065] The preferred embodiment of the asphalt mixture ice and snow melting test device simulating real service environment has a sealing layer 9 on the inner wall of the region of the organic glass cavity 6 containing the asphalt mixture test piece 12.

[0066] The preferred embodiment of the asphalt mixture ice and snow melting test device simulating real service environment has an automatic drainage device and a temperature adjusting device provided in the water injection and drainage pipe 20.

[0067] In one embodiment, a temperature sensor is provided in the organic glass cavity 6.

[0068] In one embodiment, the asphalt mixture ice and snow melting test device simulating real service environment comprises a processor connected to the pressure gauge 8, the temperature sensor and the chloride ion tester 15 to generate a data chart based on the pressure data, the temperature data and the chloride ion concentration test and test times.

[0069] In one embodiment, the test device comprises a top plate 3, a piston 4, a fixed bottom plate 10, silica gel sheets, an organic glass cavity 6, Marshall test pieces, deionized water, a real-time chloride ion concentration tester 15, a water pressure gauge and a water injection device and an automatic drainage device. The device further comprises a top plate 3 and an organic glass cavity 6 upper end connector 19, a bottom plate 10 and an organic glass cavity 6 lower end connector, an organic glass cavity 6 lower end and a fixed bottom plate 10 connection, an organic glass cavity 6 upper end and a top plate 3 connection, a connection maintained airtight by placing silica gel sheets, a loading piston 4 inserted in the organic glass cavity 6, a rubber ring 5 around the piston 4 to achieve airtightness, and asphalt mixture Marshall test pieces fixed in position by rubber sleeves and sealing glue. The test conditions are controlled by means of a universal testing machine, the release process of the effective components is reflected by testing the chloride ion concentration of the aqueous solution after a single test, the aqueous solution is injected by using a water injection device, and the aqueous solution in the cavity is automatically drained by using an automatic drainage device.

[0070] The test method of the asphalt mixture ice and snow melting test device simulating real service environment comprises the following steps,

[0071] Step one, determine the annual rainfall frequency, annual average rainfall and daily rainfall distribution in real service environment, and divide the test conditions based on the average rainfall and daily rainfall distribution and temperature data;

[0072] Step two, prepare the asphalt mixture test piece to form the Marshall test piece, and seal the four sides and bottom surface of the Marshall test piece with sealant to simulate the service state of the pavement;

[0073] Step three, place the Marshall test piece into the test device and connect the test device with the loading machine;

[0074] Step four, add the determined single water consumption and Marshall test piece in the environmental box for a predetermined time, then connect the injection and drainage hole 13 through the injection and drainage pipe 20, add the Marshall test piece surface, then adjust the height of the piston 4 to the liquid surface position, close the exhaust hole 17, and adjust the frequency of the loading machine to simulate the service state of the pavement at this temperature;

[0075] Step five, after the single test is completed, record the chloride ion concentration of the water measured by the chloride ion tester 15, and discharge the water in the organic glass cavity 6 through the drainage device and collect it into the container;

[0076] Step six, repeat the operation of steps four and five until the chloride ion concentration is close to 0, and record the chloride ion concentration test results and test times after each test;

[0077] Step seven, convert the test times into service life according to the annual rainfall frequency to predict the long-term ice and snow melting performance of the ice and snow melting asphalt mixture.

[0078] In a preferred embodiment, the method steps are as follows:

[0079] Step one, investigate the annual average rainfall and daily rainfall distribution of the area, and divide the test conditions according to the rainfall and temperature conditions in a year;

[0080] Step two, prepare the test test piece, and form the standard Marshall test piece according to the method specified in the "Highway Engineering Asphalt and Asphalt Mixture Test Regulations" (JTG E20-2011), seal the four sides and bottom surface of the Marshall test piece with sealant, and simulate the real service state of the pavement;

[0081] Step three, assemble the test equipment, place the test test piece into the rubber sleeve, and fix the position of the test test piece with sealant, and connect the test device with the universal loading machine;

[0082] Step four, the determined single water consumption and test piece in the environmental box for 30 min, then the water inlet is rotated to the device opening upward by screw, the water is added to the test device test piece surface by using the principle of communicating vessel, then the piston 4 height is adjusted to the liquid surface position, and the air hole is closed. At this temperature, the frequency of the testing machine is adjusted to simulate the service state of the pavement at this temperature;

[0083] Step five, after the single test is finished, the data displayed by the automatic chloride ion concentration tester 15 is recorded, the water solution in the cavity is discharged through the automatic drainage device and collected in the container;

[0084] Step six, the operation steps of steps four and five are repeated until the chloride ion release concentration approaches to 0, the experiment is finished, and the chloride ion concentration test result after each test and the test number are recorded;

[0085] Step seven, according to the number of rainfall per year, the test number is converted into service life, and the long-term performance of ice and snow melting asphalt mixture for melting ice and snow is predicted.

[0086] Evaluation method: according to the average annual rainfall of the studied area, the number of rainfall is determined, so that the single rainfall is obtained, the single water addition is converted according to the surface area of the test piece, then the test number is recorded, and the service life of the ice and snow melting performance is converted.

[0087] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, not all the embodiments, based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

[0088] The above only describes some exemplary embodiments of the present application by way of illustration, and it is needless to say that for ordinary skilled in the art, the described embodiments can be modified in various ways without departing from the spirit and scope of the present application. Therefore, the above figures and description are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the present application.

Claims

1. A device for testing asphalt mixture in a real service environment to reflect the release process of effective components by testing the chloride ion concentration of water solution after a single experiment, characterized in that, It comprises: A plexiglass cavity, which is a hollow structure with open ends, the plexiglass cavity contains the inner wall of the asphalt mixture test piece area provided with a sealing layer; A top plate which is detachably connected to the top end of the plexiglass cavity; A piston pull rod which extends through the top plate into the plexiglass cavity; A piston which is connected to the bottom end of the piston pull rod and is movable relative to the inner wall of the plexiglass cavity, the piston is surrounded by a rubber ring sealing contact with the inner wall of the plexiglass cavity; the piston surrounded by the rubber ring, the plexiglass cavity, the asphalt mixture test piece and the sealing layer form a containing space containing water, the height of the piston is adjusted to the liquid surface position; A bottom plate which is detachably connected to the bottom end of the plexiglass cavity; An asphalt mixture test piece which is provided in the plexiglass cavity and carried on the bottom plate; A water injection and drainage hole which is provided in the side wall of the plexiglass cavity; A water injection and drainage pipe which is connected to the water injection and drainage hole through a water injection and drainage valve; A chloride ion tester which is connected to the plexiglass cavity to measure the chloride ion concentration of the water therein; A pressure gauge which is connected to the plexiglass cavity through a pressure water pipe to measure the pressure data of the water in the containing space; An exhaust hole which is arranged through the piston to form an exhaust passage, the exhaust passage is provided with an exhaust valve.

2. The device for testing the ice and snow melting of asphalt mixture in a simulated real service environment according to claim 1, characterized in that, The top end of the piston pull rod is provided with a first connecting piece, the bottom plate is provided with a second connecting piece, and the first connecting piece is detachably connected to the loading machine.

3. The device for testing the ice and snow melting of asphalt mixture in a simulated real service environment according to claim 2, characterized in that, The first connecting piece has an upper thread, and the second connecting piece has a lower thread.

4. The device for testing the ice and snow melting of asphalt mixture in a simulated real service environment according to claim 1, characterized in that, The top plate is detachably connected to the plexiglass cavity through an upper end connecting piece, and the bottom plate is detachably connected to the plexiglass cavity through a lower end connecting piece.

5. The device for testing the ice and snow melting of asphalt mixture in a simulated real service environment according to claim 4, characterized in that, The upper end connecting piece and the lower end connecting piece comprise a bolt structure.

6. The device for testing the ice and snow melting of asphalt mixture in a simulated real service environment according to claim 1, characterized in that, The top end of the plexiglass cavity is provided with a silica gel sheet at the connection with the top plate, and the bottom end of the plexiglass cavity is provided with a silica gel sheet at the connection with the bottom plate.

7. The device for testing the ice and snow melting of asphalt mixture in a simulated real service environment according to claim 1, characterized in that, The water injection and drainage pipe is provided with an automatic drainage device and a temperature adjusting device.

8. The test method of the device for testing the ice and snow melting of asphalt mixture in a simulated real service environment according to any one of claims 1-7, characterized in that, It comprises the following steps, Step one, determine the number of annual rainfall, annual average rainfall and daily rainfall distribution in the real service environment, divide the test working condition based on the average rainfall, daily rainfall distribution and temperature data; Step two, prepare the asphalt mixture test piece into Marshall test piece, seal the Marshall test piece around and bottom surface with glue to simulate the service state of the pavement; Step three, put the Marshall test piece into the test device and connect the test device with the loading machine; Step four, add the determined single water consumption and the Marshall test piece in the environmental box for a predetermined time, then add the Marshall test piece surface through the water injection and drainage pipe connected to the water injection and drainage hole, then adjust the height of the piston to the liquid surface position, close the exhaust hole, and adjust the frequency of the loading machine at this temperature to simulate the service state of the pavement; Step five, after the single test is completed, record the chloride ion concentration of the water measured by the chloride ion tester, and discharge the water in the plexiglass cavity through the drainage device and collect it into a container; Step six, repeat the operation of steps four and five until the chloride ion concentration approaches 0, record the chloride ion concentration test results and the number of tests after each test. Step seven, according to the number of annual rainfall times to convert the test times into service life prediction of ice and snow melting asphalt mixture ice and snow melting long-term performance.

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