CN114002261A - Asphalt mixture linear shrinkage coefficient measuring device and using method thereof - Google Patents
Asphalt mixture linear shrinkage coefficient measuring device and using method thereof Download PDFInfo
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- CN114002261A CN114002261A CN202111432718.4A CN202111432718A CN114002261A CN 114002261 A CN114002261 A CN 114002261A CN 202111432718 A CN202111432718 A CN 202111432718A CN 114002261 A CN114002261 A CN 114002261A
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- 239000000203 mixture Substances 0.000 title claims abstract description 46
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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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
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/42—Road-making materials
Abstract
The invention discloses a device for measuring the linear shrinkage coefficient of an asphalt mixture, which comprises a master control device, a main water tank device and an auxiliary water tank device, wherein the main water tank device mainly comprises a main water tank body; one side wall of the main water tank body is connected with the side wall of the auxiliary water tank body through a communicating pipe and a rubber hose, and the other side wall of the main water tank body is connected with the master control device through a condensate water inlet pipe and a condensate water outlet pipe. Accordingly, the inventor establishes a method for measuring the linear shrinkage coefficient of the asphalt mixture by using the device, prepares a marshall sample of the asphalt mixture and a sample after cutting a track plate which are made of the same material and have the same grading, respectively carries out the linear shrinkage test of the asphalt mixture on different samples by using the device, calculates the average linear shrinkage coefficient of the samples, and calculates the conversion coefficient of the samples by using a formula. The device and the method are suitable for measuring the linear shrinkage coefficient of the asphalt mixture, are convenient to operate and accurate in test result, and can be directly carried out by adopting a Marshall sample in the future test.
Description
Technical Field
The invention belongs to the technical field of highway engineering test equipment, and particularly relates to a device for measuring a shrinkage coefficient of an asphalt mixture line and a using method thereof.
Background
According to statistics, the total mileage of the expressway in China reaches 16.1 kilometers by the end of 2020, wherein the asphalt pavement is the most common pavement structure of the expressway in China due to the characteristics of good driving comfort, easy maintenance and the like, and the occupation ratio of the asphalt pavement is up to more than 90%. Asphalt pavement has good viscoelastic property as common flexible pavement, but due to the temperature sensitivity characteristic, various fine cracks are easily generated in regions with large four-season temperature difference due to coupling factors such as temperature stress and vehicle load, and the fine cracks are easily gradually developed into network cracks, chaps and other serious diseases under the influence of environmental factors, so that the safety and the comfort of driving are further influenced. Therefore, how to optimize the asphalt pavement material selection in the design stage so as to prevent the generation of diseases becomes one of the important problems which are really concerned by road practitioners.
The linear shrinkage coefficient of the asphalt mixture is an indispensable parameter for calculating the temperature stress of the asphalt pavement, and is closely related to the temperature shrinkage cracking of the asphalt pavement, but the linear shrinkage coefficient test of the asphalt mixture carried out in the road engineering asphalt and asphalt mixture test procedure (JTG E20-2011) of the existing specification is complex in operation and extremely high in requirements on quality and experience of testers, and the linear shrinkage coefficient test of the asphalt mixture mainly has the following defects:
1. the preparation of a test sample is complex, the test specifies that a rutting plate sample formed by a wheel milling method is cut into a cuboid sample of 200mm multiplied by 20mm, the consumption of materials in actual operation is large, the cutting difficulty is high, and the sample is difficult to prepare;
2. the operation difficulty of the test is high, two metal measuring heads are required to be arranged at the center of two sides of a cuboid in the test, a contraction instrument dial indicator is arranged at one measuring head, when the test is carried out to a specified temperature, a tester quickly takes out a sample from a water tank and carries out reading within 5s, and the requirement on the experience and quality of the tester is extremely high;
3. the test reading is difficult and has errors, a tester needs to take out a sample from condensate with lower temperature for reading in the test process, and the sample is heated and expanded after contacting air, so that personal errors are caused to the test result;
4. the test equipment influences the test precision, and this experiment is placed the sample level at the bottom of constant temperature basin tank, because the sample is its bottom surface area of cuboid great, and contact basin face is bigger its frictional force is bigger, will lead to the experiment to produce the error.
How to improve the test equipment and the test method aiming at the above disadvantages is one of the problems to be solved urgently in exploring the linear shrinkage coefficient of the asphalt mixture.
Disclosure of Invention
The invention aims to provide an asphalt mixture linear shrinkage coefficient measuring device with convenient test operation and accurate test result and a using method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
the asphalt mixture line shrinkage coefficient measuring device comprises a master control device, a main water tank device and an auxiliary water tank device, wherein the main water tank device mainly comprises a main water tank body, and the auxiliary water tank device mainly comprises an auxiliary water tank body; one side wall of the main water tank body is connected with the side wall of the auxiliary water tank body through a communicating pipe and a rubber hose, and the other side wall of the main water tank body is connected with the master control device through a condensate water inlet pipe and a condensate water outlet pipe; the bottom of the main water tank body is provided with a cuboid support, a round platform support and a stirring fan, and the stirring fan is connected with the master control device through a power sensing line; a laser ranging sensor is arranged in the side wall of the main water tank body and is connected with the master control device through a laser ranging sensing line; a temperature sensor is arranged in the main water tank body and is connected with the master control device through a temperature sensing line; the auxiliary water tank body is placed on the lifting platform, the upper end of the lifting rod is connected below the lifting platform, the lower end of the lifting rod is embedded into the lifting base, and the lifting base is connected with the master control device through a lifting sensing line.
A main water tank top cover is arranged on the main water tank body, a main water tank cap is arranged on the main water tank top cover, and a main water tank vent pipe penetrates through the main water tank cap to be communicated with the main water tank body; an auxiliary water tank top cover is arranged on the auxiliary water tank body, an auxiliary water tank cap is arranged on the auxiliary water tank top cover, and an auxiliary water tank vent pipe penetrates through the auxiliary water tank cap to be communicated with the auxiliary water tank body.
The main water tank body, the main water tank cover top, the auxiliary water tank body and the auxiliary water tank cover top are all made of steel plate-plastic foam-steel plate structures.
The rectangular support comprises a support rod, a shaft lever and a rubber roller, the support rod is welded with the shaft lever, the rubber roller penetrates through the shaft lever to form connection, and the support rod is welded at the bottom of the main water tank body; the circular truncated cone support comprises a circular truncated cone support rod, a detachable circular truncated cone support platform and a slidable measuring block, the circular truncated cone support rod is welded to the bottom of the main water tank body on the inner side of the rectangular support, the lower portion of the detachable circular truncated cone support platform is provided with a threaded structure detachably connected with the circular truncated cone support rod, and the slidable measuring block is embedded into the middle of the detachable circular truncated cone support platform; the stirring fan is arranged at the bottom of the main water tank body outside the cuboid support.
The master control device mainly comprises a master control display platform, a temperature control device and a power control device; the laser ranging sensor is connected with the master control display platform through a laser ranging sensing line; the other side wall of the main water tank body is connected with a temperature control device through a condensate inlet pipe and a condensate outlet pipe; the temperature sensor is connected with the temperature control device through a temperature sensing line; the stirring fan is connected with the power control device through a power sensing line; the lower end of the lifting rod is embedded into the lifting base and is connected with the power control device through a lifting sensing wire.
The laser distance measuring sensor is arranged at a height which is coincident with the upper, middle and lower axes of the placed test piece, and the temperature sensor is arranged at a height which is consistent with the height of the central axis of the test piece.
The device is used for measuring the linear shrinkage coefficient of the asphalt mixture.
The method for measuring the linear shrinkage coefficient of the asphalt mixture by using the device comprises the steps of preparing the Marshall sample of the asphalt mixture with the same material and gradation and the sample after the cutting of the rutting plate, respectively carrying out the linear shrinkage test of the asphalt mixture on different samples by using the device, calculating the average linear shrinkage coefficient of the samples, calculating the conversion coefficient of the samples by using a formula, and directly carrying out test measurement by using the Marshall sample of the asphalt mixture in the future test.
The method for measuring the linear shrinkage coefficient of the asphalt mixture comprises the following operation steps:
(1) preparing an asphalt mixture Marshall sample and a rutting plate sample which are made of the same materials and have the same grading according to the test requirements and the standard steps, and cutting the rutting plate sample into a rutting plate cut sample with the size of 20mm multiplied by 200mm which is required by the standard;
(2) placing the sample after cutting the rut plate on a cuboid support in a main water tank body, wherein the height position of a laser ranging sensor is just positioned on the upper, middle and lower three axial lines of the sample;
(3) preparing methanol water condensate according to the specification, injecting the methanol water condensate into the main water tank body, and flowing into the main control device and the auxiliary water tank body through the condensate water inlet pipe and the communicating pipe; the depth of the injected liquid should exceed more than 20mm above the sample, and the top covers of the main water tank body and the auxiliary water tank body are covered on the upper parts of the main water tank body and the auxiliary water tank body;
(4) starting a master control device for temperature control, measuring the temperature of the condensate through a temperature sensor, controlling the temperature of the condensate to be 10 ℃, and uniformly controlling the temperature of the condensate in the main water tank body by rotating a stirring fan under the power supplied by a power control device;
(5) when the temperature of the sample in the condensate is kept at 10 ℃ for 30min, the master control device is controlled to open the lifting rod at the bottom of the auxiliary water tank body to rapidly descend, so that the condensate of the main water tank body rapidly flows into the auxiliary water tank body through the communicating pipe and the rubber hose; when the liquid level of the main water tank body is lower than the bottom of the sample, stopping the lifting rod, starting the master control device, measuring the upper, middle and lower axis zero contraction points of the sample by adopting a laser ranging sensor, and calculating an average zero contraction point L0; after data are recorded, the lifting rod is opened immediately to quickly rise, so that the liquid level of condensate of the main water tank body is restored to be more than 20mm above the sample;
(6) starting a temperature control device in the master control device to start cooling the condensate, keeping the cooling rate at 5 ℃/h until the condensate is cooled to-30 ℃ of a preset end temperature, stopping cooling, and keeping the temperature for 30min under the condition; repeating the test determination operation in (5), reading and calculating the average final shrinkage length Le; calculating an average linear shrinkage coefficient Cc through the following formula (1) and formula (2); if the Marshall sample is adopted to replace the sample after the rut plate is cut for the future test, the next test is carried out;
(7) closing the temperature control device in the master control device to recover the condensate to the room temperature; taking out a sample from the cuboid support, installing a detachable circular platform bearing platform on the upper part of a circular platform support rod, placing the Marshall sample in the center of the detachable circular platform bearing platform, coating the inner side of the slidable measuring block with uniform 502 glue and tightly attaching the Marshall sample along the longitudinal direction of a groove of the detachable circular platform bearing platform, wherein the height of the laser ranging sensor corresponds to the upper, middle and lower axes of the slidable measuring block;
(8) repeating the measuring operations of the steps (4), (5) and (6), and calculating the average linear shrinkage coefficient Cm of the Marshall sample through the formula (1) and the formula (2);
(9) calculating a conversion coefficient a of a Marshall sample conversion rut plate cutting sample through a formula (3);
(10) recording the conversion coefficient, and calculating the average linear shrinkage coefficient Cc of the sample after the rut plate is cut by adopting a formula (4);
the formulas (1) to (4) are respectively:
Cm＝αCcformula (3)
In the formula: epsilone-average shrinkage strain; l ise-length of sample after shrinkage at-20 ℃; l is0-original length of sample at +10 ℃; cm — average linear shrinkage length of marshall specimens; cc is the average line shrinkage length of the sample after cutting the rut plate; delta T-temperature interval, 40 ℃; α -the scaling factor.
Aiming at the problems existing in the existing asphalt mixture linear shrinkage coefficient measurement, the inventor designs an asphalt mixture linear shrinkage coefficient measurement device which comprises a master control device, a main water tank device and an auxiliary water tank device, wherein the main water tank device mainly comprises a main water tank body, and the auxiliary water tank device mainly comprises an auxiliary water tank body; one side wall of the main water tank body is connected with the side wall of the auxiliary water tank body through a communicating pipe and a rubber hose, and the other side wall of the main water tank body is connected with the master control device through a condensate water inlet pipe and a condensate water outlet pipe. Accordingly, the inventor establishes a method for measuring the linear shrinkage coefficient of the asphalt mixture by using the device, prepares a marshall sample of the asphalt mixture and a sample after cutting a track plate which are made of the same material and have the same grading, respectively carries out the linear shrinkage test of the asphalt mixture on different samples by using the device, calculates the average linear shrinkage coefficient of the samples, and calculates the conversion coefficient of the samples by using a formula. The device and the method are suitable for measuring the linear shrinkage coefficient of the asphalt mixture, reduce the difficulty of test operation, improve the test detection precision, have accurate and reliable test results, and can directly adopt the Marshall sample to replace the sample after the rutting plate is cut in the future test.
Drawings
FIG. 1 is a schematic view showing the basic structure of an apparatus for measuring linear shrinkage coefficient of asphalt mixture according to the present invention.
Fig. 2 is a schematic diagram of the use state of the test rut plate cutting test applying the invention.
FIG. 3 is a schematic view showing the state of use of the Marshall specimen when the present invention is applied to the test.
FIG. 4 is a side view of a rectangular parallelepiped support of the present invention.
FIG. 5 is a front view of the circular truncated cone support of the present invention.
FIG. 6 is a side view of the circular truncated cone support of the present invention.
FIG. 7 is a block diagram showing the overall control device and its connection structure in the present invention.
In the figure: the system comprises a main control display platform 1, a condensation water inlet pipe 2, a condensation water outlet pipe 3, a temperature sensing line 4, a temperature sensor 5, a laser ranging sensor 6, a laser ranging sensing line 7, a stirring fan 8, a circular table support 9, a cuboid support 10, a main water tank cover 11, a main water tank body 12, a main water tank vent pipe 13, a main water tank cap 14, an auxiliary water tank cover 15, an auxiliary water tank body 16, an auxiliary water tank vent pipe 17, an auxiliary water tank cap 18, a lifting base 19, a lifting rod 20, a communicating pipe 21, a rubber hose 22, a lifting sensing line 23, a lifting platform 24, a power sensing line 25, a power control device 26, a temperature control device 27, a slidable measuring block 9-1, a detachable circular table support platform 9-2, a circular table support rod 9-3, a rubber roller 10-1, a shaft rod 10-2 and a support rod 10-3.
Detailed Description
A, basic structure
As shown in fig. 1, the device for measuring the linear shrinkage coefficient of the asphalt mixture comprises a master control device, a main water tank device and an auxiliary water tank device, wherein the main water tank device mainly comprises a main water tank body, and the auxiliary water tank device mainly comprises an auxiliary water tank body; one side wall of the main water tank body is connected with the side wall of the auxiliary water tank body through a communicating pipe and a rubber hose. Wherein the content of the first and second substances,
a main water tank top cover is arranged on the main water tank body, a main water tank cap is arranged on the main water tank top cover, and a main water tank vent pipe penetrates through the main water tank cap to be communicated with the main water tank body; an auxiliary water tank top cover is arranged on the auxiliary water tank body, an auxiliary water tank cap is arranged on the auxiliary water tank top cover, and an auxiliary water tank vent pipe penetrates through the auxiliary water tank cap to be communicated with the auxiliary water tank body. The main water tank body, the main water tank cover top, the auxiliary water tank body and the auxiliary water tank cover top are all made of steel plate-plastic foam-steel plate structures.
The bottom of the main water tank body is provided with a cuboid support, a round platform support and a stirring fan; a laser ranging sensor (the setting height of which is superposed with the upper, middle and lower axes of the placed test piece) is arranged in the side wall of the main water tank body; a temperature sensor (the setting height of which is consistent with the height of the central axis of the test piece) is arranged in the main water tank body; the auxiliary water tank body is placed on the lifting platform, and the lower part of the lifting platform is connected with the upper end of the lifting rod.
As shown in fig. 4, the rectangular support comprises a support rod, a shaft rod and a rubber roller, the support rod is welded with the shaft rod, the rubber roller penetrates through the shaft rod to form connection, and the support rod is welded at the bottom of the main water tank body; as shown in fig. 5 to 6, the circular truncated cone support comprises a circular truncated cone support rod, a detachable circular truncated cone bearing platform and a slidable measuring block, the circular truncated cone support rod is welded at the bottom of the main water tank body on the inner side of the rectangular support, the lower part of the detachable circular truncated cone bearing platform is provided with a threaded structure detachably connected with the circular truncated cone support rod, and the slidable measuring block is embedded in the middle of the detachable circular truncated cone bearing platform; the stirring fan is arranged at the bottom of the main water tank body outside the cuboid support.
The master control device mainly comprises a master control display platform, a temperature control device and a power control device; the laser ranging sensor is connected with the master control display platform through a laser ranging sensing line; the other side wall of the main water tank body is connected with a temperature control device through a condensate inlet pipe and a condensate outlet pipe; the temperature sensor is connected with the temperature control device through a temperature sensing line; the stirring fan is connected with the power control device through a power sensing line; the lower end of the lifting rod is embedded into the lifting base and is connected with the power control device through a lifting sensing wire.
Second, principle of measurement
Preparing an asphalt mixture Marshall sample and a rut plate cut sample with the same material and grading, respectively carrying out asphalt mixture linear shrinkage tests on different samples by adopting a device, calculating the average linear shrinkage coefficient, calculating the conversion coefficient by a formula, and directly adopting the Marshall sample to replace the rut plate cut sample for testing in the future test.
Referring to equations (1) to (4) are:
Cm＝αCcformula (3)
In the formula: epsilone-average shrinkage strain; l iseLength (mm) of the sample after shrinkage at-20 ℃; l is0Original length of sample (mm) — +10 ℃; cm — average linear shrinkage length (mm) of marshall specimens; cc-average linear shrinkage length (mm) of the sample after rut plate cutting; delta T-temperature interval, the difference from the starting temperature (+10 ℃) to the final temperature (-30 ℃) is 40 ℃; α -the scaling factor.
Third, using method
(1) Preparing an asphalt mixture Marshall sample and a rutting plate sample which are made of the same materials and have the same grading according to the test requirements and the standard steps, and cutting the rutting plate sample into a sample with the size of 20mm multiplied by 200mm which is required by the standard requirements;
(2) placing the sample after cutting the rut plate on a cuboid support in a main water tank body (see figure 2), wherein the height position of the laser ranging sensor is just positioned on the upper, middle and lower three axes of the sample;
(3) preparing methanol water condensate according to the specification, injecting the methanol water condensate into the main water tank body, and flowing into the main control device and the auxiliary water tank body through the condensate water inlet pipe and the communicating pipe; the depth of the injected liquid should exceed more than 20mm above the sample, and the top covers of the main water tank body and the auxiliary water tank body are covered on the upper parts of the main water tank body and the auxiliary water tank body;
(4) starting a master control device for temperature control, measuring the temperature of the condensate through a temperature sensor, controlling the temperature of the condensate to be 10 ℃, and uniformly controlling the temperature of the condensate in the main water tank body by rotating a stirring fan under the power supplied by a power control device;
(5) when the temperature of the sample in the condensate is kept at 10 ℃ for 30min, the master control device is controlled to open the lifting rod at the bottom of the auxiliary water tank body to rapidly descend, and the condensate of the main water tank body rapidly flows into the auxiliary water tank body through a communicating pipe and a rubber hose based on the principle of a communicating vessel; when the liquid level of the main water tank body is lower than the bottom of the sample, stopping the lifting rod, starting the master control device, measuring the contraction zero points of the upper, middle and lower axes of the sample by adopting a laser ranging sensor, and calculating the average contraction zero point (L0) to be accurate to 0.001 mm; after data are recorded, the lifting rod is opened immediately to quickly rise, so that the liquid level of condensate of the main water tank body is restored to be more than 20mm above the sample;
(6) starting a temperature control device in the master control device to start cooling the condensate, keeping the cooling rate at 5 ℃/h until the condensate is cooled to-30 ℃ of a preset end temperature, stopping cooling, and keeping the temperature for 30min under the condition; repeating the test determination operation in (5), reading and calculating the average final shrinkage length (Le) to be accurate to 0.001 mm; calculating an average linear shrinkage coefficient Cc through the following formula (1) and formula (2), wherein the average linear shrinkage coefficient Cc can be used as a final result of the test; if the Marshall sample is adopted to replace the sample after the rut plate is cut for the future test, the next test is carried out;
(7) closing the temperature control device in the master control device to recover the condensate to the room temperature; taking out a sample from the cuboid support, installing a detachable circular platform bearing platform on the upper part of a circular platform support rod, placing a Marshall sample in the center position of the detachable circular platform bearing platform (see figure 3), coating uniform 502 glue on the inner side of the slidable measuring block and tightly attaching the Marshall sample along the longitudinal direction of a groove of the detachable circular platform bearing platform, wherein the height of the laser ranging sensor corresponds to the upper, middle and lower axes of the slidable measuring block;
(8) repeating the measuring operations of the steps (4), (5) and (6), and calculating the average linear shrinkage coefficient Cm of the Marshall sample through the formula (1) and the formula (2);
(9) calculating a conversion coefficient a of a Marshall sample conversion rut plate cutting sample through a formula (3);
(10) recording the conversion coefficient so as to measure the average linear shrinkage coefficient Cm of the Marshall sample by directly adopting the Marshall sample to replace the rut plate cutting sample to finish the asphalt mixture linear shrinkage test in the future test, and calculating the average linear shrinkage coefficient Cc of the sample after the rut plate cutting by adopting a formula (4) in a reverse way.
Claims (9)
1. A device for measuring the linear shrinkage coefficient of an asphalt mixture is characterized by comprising a master control device, a main water tank device and an auxiliary water tank device, wherein the main water tank device mainly comprises a main water tank body; one side wall of the main water tank body is connected with the side wall of the auxiliary water tank body through a communicating pipe and a rubber hose, and the other side wall of the main water tank body is connected with the master control device through a condensate water inlet pipe and a condensate water outlet pipe; the bottom of the main water tank body is provided with a cuboid support, a round platform support and a stirring fan, and the stirring fan is connected with a master control device through a power sensing line; a laser ranging sensor is arranged in the side wall of the main water tank body and is connected with the master control device through a laser ranging sensing line; a temperature sensor is arranged in the main water tank body and is connected with the master control device through a temperature sensing line; the auxiliary water tank body is placed on the lifting platform, the upper end of the lifting rod is connected below the lifting platform, the lower end of the lifting rod is embedded into the lifting base, and the auxiliary water tank body is connected with the master control device through a lifting sensing line.
2. The apparatus for measuring linear shrinkage coefficient of asphalt mixture according to claim 1, wherein: the main water tank body is provided with a main water tank top cover, the main water tank top cover is provided with a main water tank cap, and a main water tank vent pipe penetrates through the main water tank cap to be communicated with the main water tank body; and an auxiliary water tank top cover is arranged on the auxiliary water tank body, an auxiliary water tank cap is arranged on the auxiliary water tank top cover, and an auxiliary water tank vent pipe penetrates through the auxiliary water tank cap to be communicated with the auxiliary water tank body.
3. The apparatus for measuring linear shrinkage coefficient of asphalt mixture according to claim 2, wherein: the main water tank body, the main water tank cover top, the auxiliary water tank body and the auxiliary water tank cover top are all made of steel plate-plastic foam-steel plate structures.
4. The apparatus for measuring linear shrinkage coefficient of asphalt mixture according to claim 1, wherein: the rectangular support comprises a support rod, a shaft lever and a rubber roller, the support rod is connected with the shaft lever in a welding mode, the rubber roller penetrates through the shaft lever to form connection, and the support rod is welded to the bottom of the main water tank body; the circular truncated cone support comprises a circular truncated cone support rod, a detachable circular truncated cone bearing platform and a slidable measuring block, the circular truncated cone support rod is welded to the bottom of the main water tank body on the inner side of the rectangular support, the lower portion of the detachable circular truncated cone bearing platform is provided with a threaded structure detachably connected with the circular truncated cone support rod, and the slidable measuring block is embedded into the middle of the detachable circular truncated cone bearing platform; the stirring fan is arranged at the bottom of the main water tank body outside the cuboid support.
5. The apparatus for measuring linear shrinkage coefficient of asphalt mixture according to claim 1, wherein: the master control device mainly comprises a master control display platform, a temperature control device and a power control device; the laser ranging sensor is connected with the master control display platform through a laser ranging sensing line; the other side wall of the main water tank body is connected with a temperature control device through a condensate inlet pipe and a condensate outlet pipe; the temperature sensor is connected with the temperature control device through a temperature sensing line; the stirring fan is connected with the power control device through a power sensing line; the lower end of the lifting rod is embedded into the lifting base and is connected with the power control device through a lifting sensing wire.
6. The apparatus for measuring linear shrinkage coefficient of asphalt mixture according to claim 5, wherein: the laser distance measuring sensor is arranged at a height which is coincident with the upper, middle and lower axes of the placed test piece, and the temperature sensor is arranged at a height which is consistent with the height of the central axis of the test piece.
7. The apparatus of claim 1 for determining the linear shrinkage factor of a bituminous mixture.
8. A method for determining the linear shrinkage factor of an asphalt mixture using the apparatus of claim 1, wherein: preparing an asphalt mixture Marshall sample and a rut plate cut sample with the same material and grading, respectively carrying out asphalt mixture linear shrinkage tests on different samples by adopting a device, calculating the average linear shrinkage coefficient of the samples, and calculating the conversion coefficient of the samples by a formula.
9. The method for determining the linear shrinkage coefficient of an asphalt mixture according to claim 8, wherein the method comprises the following steps:
(1) preparing an asphalt mixture Marshall sample and a rutting plate sample which are made of the same materials and have the same grading according to the test requirements and the standard steps, and cutting the rutting plate sample into a rutting plate cut sample with the size of 20mm multiplied by 200mm which is required by the standard;
(2) placing the sample after cutting the rut plate on a cuboid support in a main water tank body, wherein the height position of a laser ranging sensor is just positioned on the upper, middle and lower three axial lines of the sample;
(3) preparing methanol water condensate according to the specification, injecting the methanol water condensate into the main water tank body, and flowing into the main control device and the auxiliary water tank body through the condensate water inlet pipe and the communicating pipe; the depth of the injected liquid should exceed more than 20mm above the sample, and the top covers of the main water tank body and the auxiliary water tank body are covered on the upper parts of the main water tank body and the auxiliary water tank body;
(4) starting a master control device for temperature control, measuring the temperature of the condensate through a temperature sensor, controlling the temperature of the condensate to be 10 ℃, and uniformly controlling the temperature of the condensate in the main water tank body by rotating a stirring fan under the power supplied by a power control device;
(5) when the temperature of the sample in the condensate is kept at 10 ℃ for 30min, the master control device is controlled to open the lifting rod at the bottom of the auxiliary water tank body to rapidly descend, so that the condensate of the main water tank body rapidly flows into the auxiliary water tank body through the communicating pipe and the rubber hose; when the liquid level of the main water tank body is lower than the bottom of the sample, stopping the lifting rod, starting the master control device, measuring the upper, middle and lower axis zero contraction points of the sample by adopting a laser ranging sensor, and calculating an average zero contraction point L0; after data are recorded, the lifting rod is opened immediately to quickly rise, so that the liquid level of condensate of the main water tank body is restored to be more than 20mm above the sample;
(6) starting a temperature control device in the master control device to start cooling the condensate, keeping the cooling rate at 5 ℃/h until the condensate is cooled to-30 ℃ of a preset end temperature, stopping cooling, and keeping the temperature for 30min under the condition; repeating the test determination operation in (5), reading and calculating the average final shrinkage length Le; calculating an average linear shrinkage coefficient Cc through the following formula (1) and formula (2); if the Marshall sample is adopted to replace the sample after the rut plate is cut for the future test, the next test is carried out;
(7) closing the temperature control device in the master control device to recover the condensate to the room temperature; taking out a sample from the cuboid support, installing a detachable circular platform bearing platform on the upper part of a circular platform support rod, placing the Marshall sample in the center of the detachable circular platform bearing platform, coating the inner side of the slidable measuring block with uniform 502 glue and tightly attaching the Marshall sample along the longitudinal direction of a groove of the detachable circular platform bearing platform, wherein the height of the laser ranging sensor corresponds to the upper, middle and lower axes of the slidable measuring block;
(8) repeating the measuring operations of the steps (4), (5) and (6), and calculating the average linear shrinkage coefficient Cm of the Marshall sample through the formula (1) and the formula (2);
(9) calculating a conversion coefficient a of a Marshall sample conversion rut plate cutting sample through a formula (3);
(10) recording the conversion coefficient, and calculating the average linear shrinkage coefficient Cc of the sample after the rut plate is cut by adopting a formula (4);
the formulas (1) to (4) are respectively as follows:
Cm＝αCcformula (3)
In the formula: epsilone-average shrinkage strain; l ise-length of sample after shrinkage at-20 ℃; l is0-original length of sample at +10 ℃; cm — average linear shrinkage length of marshall specimens; cc is the average line shrinkage length of the sample after cutting the rut plate; delta T-temperature interval, 40 ℃; α -the scaling factor.
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