CN110987569A - Beam test piece forming device and method for asphalt mixture - Google Patents
Beam test piece forming device and method for asphalt mixture Download PDFInfo
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- CN110987569A CN110987569A CN201911378433.XA CN201911378433A CN110987569A CN 110987569 A CN110987569 A CN 110987569A CN 201911378433 A CN201911378433 A CN 201911378433A CN 110987569 A CN110987569 A CN 110987569A
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- G01—MEASURING; TESTING
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Abstract
The invention discloses a beam test piece forming device and a beam test piece forming method for an asphalt mixture, and belongs to the technical field of asphalt mixtures for road engineering; according to the invention, through structural design, the forming device can form beam test pieces with different heights and different widths without cutting, so that the problems of stress concentration caused by cutting of a track plate, incapability of completely simulating vibration rolling of road construction and difficulty in forming of test pieces with larger thickness in the forming and manufacturing processes of the bituminous mixture trabecular test pieces in the existing experiment are solved, and the accuracy of the evaluation of the low-temperature cracking performance of the bituminous mixture and the fatigue performance verification test is improved; meanwhile, the operation is convenient and fast, and the accuracy and the repeatability of the test result are improved.
Description
Technical Field
The invention belongs to the technical field of asphalt mixtures for road engineering, and particularly relates to a beam test piece forming device and a beam test piece forming method for an asphalt mixture.
Background
The asphalt pavement has the advantages of good driving comfort, short construction period, convenient maintenance and the like, and becomes the main pavement structure type of high-grade highways in China. However, in the use process of asphalt pavement, low temperature cracking and fatigue failure are main factors influencing the durability of the asphalt pavement, so that the evaluation of the low temperature and fatigue performance of the asphalt mixture is very important.
In the process of evaluating the low-temperature cracking performance and verifying the fatigue performance of the asphalt mixture, a wheel mill is usually adopted to form an asphalt mixture track plate, and then the track plate is cut into small beams for testing. The test method has the following disadvantages: 1) the forming method cannot completely simulate the vibration rolling of pavement construction; 2) after the mixture is cut, the appearance of the end surface aggregate is damaged, stress concentration is easily caused, and the structural state of the mixture cannot be truly reflected; 3) aiming at different mixture types, the thickness of the asphalt pavement in the pavement structure is changed, the thickness of the middle layer and the lower layer of the asphalt pavement is generally 6-8cm, the thickness of a conventional rutting plate is generally 5cm, the mixture of AC-20 or AC-25 is difficult to form, and when the thickness of the rutting plate is increased to 10cm, a wheel mill is difficult to compact the mixture. Therefore, research and development novel bituminous mixture trabecula forming device has important meaning to the reliability that improves bituminous mixture's low temperature fracture and fatigue test.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a beam test piece forming device and a forming method for an asphalt mixture, the forming device can form beam test pieces with different heights (thicknesses) and widths without cutting, the problems that stress concentration caused by cutting a track plate, vibration rolling which can not completely simulate road surface construction and difficult forming of test pieces with larger thicknesses are caused in the forming and manufacturing processes of a small beam test piece of the asphalt mixture in the existing experiment are solved, and the accuracy of low-temperature cracking performance evaluation and fatigue performance verification test of the asphalt mixture is improved; meanwhile, the operation is convenient and fast, and the accuracy and the repeatability of the test result are improved.
In order to achieve the above object, the present invention adopts the following technical solutions.
(one) beam test piece forming device of bituminous mixture includes: the device comprises a test bracket, a lifting unit, a mould and a vibration unit, wherein the lifting unit, the mould and the vibration unit are arranged on the test bracket from bottom to top; the bottom of the lifting unit is fixed on the test bracket, a support plate is horizontally arranged at the upper end of the lifting unit, and the support plate has a certain thickness; the support plate is provided with a plurality of groups of wheel grooves respectively in the front and back of the left side and the right side of the upper surface, rolling wheels are arranged in the wheel grooves, a plurality of shaft grooves are formed in the upper surface of the support plate and correspond to each group of wheel grooves, a fixed shaft is arranged in each shaft groove, and the rolling wheels are sleeved on the fixed shafts; the lower surface of the support plate is provided with a semicircular rotating shaft; the upper end of the lifting unit is provided with a bracket matched with the semicircular rotating shaft, and the semicircular rotating shaft rotates in the bracket;
the die is a rectangular hollow shell with the upper end and the lower end being respectively opened, a die cover is arranged at the upper end of the die, and a heating component is distributed in the hollow cavity of the shell; the lower ends of the left side wall and the right side wall of the mold are respectively provided with a bending part, a movable baffle is erected on the bending part, the movable baffle and the side wall of the mold form a charging cavity, and asphalt mixture is charged into the charging cavity;
the width of the support plate is smaller than the distance between each group of bent parts, and when the lifting unit moves upwards, the support plate moves upwards to enable the rolling wheel to abut against the movable baffle plate to move upwards;
the upper end of the vibration unit is fixed on the test support, and the lower end of the vibration unit is provided with the die cover.
Furthermore, a plurality of groups of vertical grooves are correspondingly formed in the left side wall and the right side wall in the mold respectively, each group of vertical grooves is internally provided with a partition plate, the lower end of each partition plate is provided with an inward bent part, corresponding movable baffle plates are erected on the bent parts, each group of partition plates and the corresponding movable baffle plates form a charging cavity with an upper end opened, and asphalt mixture is charged into the charging cavity.
Further, a moving shutter and two partitions constitute a set of loading members, and the molding apparatus is equipped with a plurality of sets of loading members.
Furthermore, the lifting unit is a screw rod lifter, a bracket is arranged at the upper end of a lifting rod of the screw rod lifter, and a semicircular rotating shaft is installed in the bracket.
Further, a gap is provided between an upper end of the bracket and a lower surface of the seat plate.
Further, the outer side wall of the mold is provided with a roller, a guide rail is arranged at a corresponding position of the test support, and the roller moves along the guide rail to enable the mold to move left and right.
Further, the vibration unit comprises a vibration motor and a reaction frame, and a die cover is installed on a reaction plate of the reaction frame.
Further, the heating part is a heating resistance wire.
Furthermore, a displacement sensor is installed at the lifting part of the lifting unit.
(II) a method for forming a beam test piece of the asphalt mixture, which comprises the following steps:
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, by designing the movable baffle, the lifting unit and the vibrating unit, the height of the asphalt mixture beam test piece can be adjusted, a compact and uniform test piece can be formed even for a test piece with larger thickness, and meanwhile, stress concentration caused by the traditional cutting of a rut plate is avoided, so that the beam test piece obtained by the invention can more accurately test and verify the low-temperature cracking performance and the fatigue performance of the asphalt mixture.
(2) The invention can simulate the vibration rolling process of road construction more truly through the structural design of the rolling wheel and the support plate.
(3) According to the invention, through the arrangement of the plurality of groups of vertical grooves, the partition plates and the movable baffle plates, beam test pieces with different widths can be molded, so that the manufactured test pieces do not need to be cut, the problem of stress concentration caused by cutting of the track plates in the molding and manufacturing processes of the bituminous mixture trabecular test pieces in the existing experiment is solved, and meanwhile, the molding efficiency is improved.
(4) The method provided by the invention is simple in operation process and high in repeatability, and the accuracy of the test result of the molded beam test piece on various performances of the asphalt mixture is improved.
Drawings
The invention is described in further detail below with reference to the figures and specific embodiments.
FIG. 1 is a schematic three-dimensional structure diagram of a beam test piece forming device of an asphalt mixture according to an embodiment of the invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a right side view of FIG. 1;
FIG. 5 is a cross-sectional view B-B of FIG. 4;
FIG. 6 is a schematic three-dimensional structure diagram of a mold according to an embodiment of the present invention;
FIG. 7 is a three-dimensional perspective view of a support plate according to an embodiment of the present invention;
in the above figures, 1 test rack; 2, a lifting unit; 201 a bracket; 3, molding; 301 a heating means; 302 a bending part; 303 vertical grooves; 304 rollers; 305 a guide rail; 4 a vibration unit; 401 vibrating a motor; 402 a reaction frame; 5 a support plate; 501 rolling wheel; 502 fixing the shaft; 503 semicircular rotating shaft; 6, covering the mould; 7 moving the shutter.
Detailed Description
The embodiments and effects of the present invention will be described in further detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1 to 7, the beam test piece forming device for the asphalt mixture of the present invention includes: the device comprises a test bracket 1, wherein a lifting unit 2, a mould 3 and a vibration unit 4 are arranged on the test bracket 1 from bottom to top; the bottom of the lifting unit 2 is fixed on the test bracket 1, a support plate 5 is horizontally arranged at the upper end of the lifting unit 2, and the support plate 5 has a certain thickness; the support plate 5 is provided with a plurality of groups of wheel grooves on the left side and the right side of the upper surface respectively in a front-back manner, rolling wheels 501 are arranged in the wheel 304 grooves, a plurality of shaft grooves are formed in the upper surface of the support plate 5 corresponding to each group of wheel grooves, a fixed shaft 502 is arranged in each shaft groove, and the rolling wheels 501 are sleeved on the fixed shafts 502; the lower surface of the support plate 5 is provided with a semicircular rotating shaft 503; the upper end of the lifting unit 2 is provided with a bracket 201 matched with the semicircular rotating shaft 503, and the semicircular rotating shaft 503 rotates in the bracket 201;
the die 3 is a rectangular hollow shell with the upper end and the lower end being respectively opened, the upper end of the die 3 is provided with a die cover 6, and a heating component 301 is distributed in the hollow cavity of the shell; the lower ends of the left side wall and the right side wall of the mold 3 are respectively provided with a bending part 302, a movable baffle 7 is erected on the bending part 302, the movable baffle 7 and the side wall of the mold 3 form a charging cavity, and asphalt mixture is charged into the charging cavity; the width of the support plate 5 is smaller than the distance between each group of bending parts 302, and when the lifting unit 2 moves upwards, the support plate 5 moves upwards to enable the rolling wheel 501 to abut against the movable baffle 7 to move upwards; the upper end of the vibration unit 4 is fixed on the test bracket 1, and the lower end of the vibration unit 4 is provided with a die cover 6.
In the above embodiment, the test stand 1 is used for fixing and mounting each component, and at the same time, the stability of the device is ensured; during charging, the movable baffle 7 is loaded from the upper opening end of the mold 3, the movable baffle 7 is clamped at the bent part 302, and the asphalt mixture to be molded is loaded into a charging cavity formed by the mold 3 and the movable baffle 7 from the upper opening of the mold 3, wherein the mass of the asphalt mixture to be loaded is calculated according to the size of a beam test piece to be molded. Lifting unit 2 drives bearing plate 5 rebound, make rolling wheel 501 on bearing plate 5 support removal baffle 7, along with the vibration of vibrating unit 4, whole device begins to vibrate, make rolling wheel 501 rotate for removal baffle front and back small-angle and roll removal baffle 7, and further rise along with lifting unit 2's lift position, bearing plate 5 is pushing away removal baffle 7 and is getting into in the mould 3, until the bituminous mixture in the mould 3 contact with the inner wall with 3 top assorted mould covers 6 of mould, by mould cover 6 like this, material in the enclosure space that mould 3 and removal baffle 7 formed is vibrating on one side and is being pushed upward by lifting unit 2, rolling wheel 501 is also rolling removal baffle 7 simultaneously. In the ascending process, the support plate 5 and the movable baffle 7 move synchronously, and the support plate 5 swings back and forth along the semicircular rotating shaft 503, so that the support plate 5, the rolling wheel 501 and the movable baffle 7 form follow-up in the back and forth direction, the rolling effect of the invention is more uniform, and the vibration rolling process of road surface construction can be simulated more truly. And after the test piece is molded, closing the vibration unit 4, lowering the lifting part of the lifting unit 2, and taking out the test piece.
The height of the asphalt mixture beam test piece can be adjusted in the test piece forming process, and the arrangement of the vibration unit 4 can form a compact and uniform test piece even for a test piece with larger thickness. Meanwhile, stress concentration caused by traditional cutting of the rut plates is avoided, so that the beam test piece obtained by the invention can more accurately test and verify the low-temperature cracking performance and the fatigue performance of the asphalt mixture.
Referring to fig. 1 and 6, according to an embodiment of the present invention, a plurality of sets of vertical grooves 303 are correspondingly formed on the left side wall and the right side wall in the mold 3, a partition is disposed in each set of vertical grooves 303, a bent portion 302 is formed at a lower end of each set of partition, a corresponding movable baffle 7 is erected on the bent portion 302, each set of partition and the corresponding movable baffle 7 form a charging cavity with an open upper end, and asphalt mixture is charged into the charging cavity.
Referring to fig. 1 and 6, according to one embodiment of the present invention, one moving shutter 7 and two partitions constitute one set of loading members, and the molding apparatus is equipped with a plurality of sets of loading members.
In the above embodiment, a plurality of groups of vertical grooves 303 are correspondingly formed in the left side wall and the right side wall of the mold 3, each group of vertical grooves 303 is provided with a partition plate, the lower end of each partition plate is provided with an inward bent part 302, the corresponding movable baffle 7 is erected on the bent part 302, each group of partition plates and the corresponding movable baffle 7 form a charging cavity with an upper end opened, and asphalt mixture is charged into the charging cavity. A moving shutter 7 and two partitions constitute a set of loading parts, and the molding apparatus is equipped with a plurality of sets of loading parts. Therefore, the beam test piece with different widths can be formed, the application range of the invention is widened, and the limitation of the traditional cutting beam test piece is broken through.
Referring to fig. 1 to 5, according to an embodiment of the present invention, the lifting unit 2 is a screw lift, the upper end of a lifting rod of the screw lift is provided with a bracket 201, and a semicircular rotating shaft 503 is installed in the bracket 201.
Referring to fig. 3 and 4, according to an embodiment of the present invention, a gap is provided between an upper end of the bracket 201 and a lower surface of the seat plate 5.
In the above embodiment, a gap is formed between the upper end of the bracket 201 and the lower surface of the support plate 5, so that the support plate 5 can rotate at a small angle along the semicircular rotating shaft, and the rotation of the support plate is limited, thereby avoiding the large-angle turnover of the support plate.
Referring to fig. 1 and 6, according to an embodiment of the present invention, rollers 304 are disposed on the outer side walls of the mold 3, and rails 305 are disposed at corresponding positions of the test rack 1, and the rollers 304 move along the rails 305 to move the mold 3 left and right.
In the above embodiment, the outer side wall of the mold 3 is provided with the roller 304, the corresponding position of the test support 1 is provided with the guide rail 305, the roller 304 moves along the guide rail 305, so that the mold 3 is only required to be pulled out when loading is needed, the mold is pushed in when pressing is carried out, loading and unloading are facilitated, and meanwhile the occupied space of the device is saved.
Referring to fig. 1 to 5, the vibration unit 4 includes a vibration motor 401 and a reaction frame 402, and a mold cover 6 is mounted on a reaction plate of the reaction frame 402 according to an embodiment of the present invention.
In the above embodiment, the lower end of the reaction frame 402 has the horizontal reaction plate, the mold cover 6 is installed below the reaction plate, so that the stability of the device can be ensured during the vibration process, and the vibration motor 401 can be installed on the upper end plane of the reaction frame 402 or the test rack 1 for generating vibration.
Referring to fig. 3, according to an embodiment of the present invention, the heating component 301 is a heating resistance wire.
In the above embodiment, the heating resistance wire is used for enabling the asphalt mixture to be pressed to reach the temperature required in the pressing process, so that the pressing process is convenient to carry out, and meanwhile, the heating resistance wire is connected with the controller so that the temperature is convenient to control.
Referring to fig. 1 to 5, a displacement sensor is installed at a lifting portion of the lifting unit 2 according to an embodiment of the present invention.
In the above embodiment, the displacement sensor is used for sensing the ascending or descending height of the lifting unit 2, and may be connected to the controller, so as to control the ascending or descending height of the lifting unit 2, thereby facilitating the control of the height in the test process.
Aiming at the defects of the existing mixture forming method, the invention designs the asphalt mixture beam vibration forming test device which has variable height and adjustable width and does not need cutting, kneading and rolling, thereby improving the accuracy of the low-temperature cracking performance evaluation and fatigue performance verification test of the asphalt mixture.
Example 2
A beam test piece forming method of an asphalt mixture comprises the following steps:
In the sample preparation process, the limit position of the forward and backward rotation of the support plate is that the lower surface of the support plate is abutted against the bracket. The invention can press beam test pieces with different beam heights and beam widths according to test requirements, and the obtained beam test pieces are compact and uniform, and simultaneously avoid stress concentration caused by cutting of the test pieces, so that the beam test pieces obtained by the invention can more accurately test and verify the low-temperature cracking performance and the fatigue performance of the asphalt mixture.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The utility model provides an asphalt mixture's roof beam test piece forming device which characterized in that includes: the device comprises a test bracket, a lifting unit, a mould and a vibration unit, wherein the lifting unit, the mould and the vibration unit are arranged on the test bracket from bottom to top; the bottom of the lifting unit is fixed on the test bracket, a support plate is horizontally arranged at the upper end of the lifting unit, and the support plate has a certain thickness; the support plate is provided with a plurality of groups of wheel grooves respectively in the front and back of the left side and the right side of the upper surface, rolling wheels are arranged in the wheel grooves, a plurality of shaft grooves are formed in the upper surface of the support plate and correspond to each group of wheel grooves, a fixed shaft is arranged in each shaft groove, and the rolling wheels are sleeved on the fixed shafts; the lower surface of the support plate is provided with a semicircular rotating shaft; the upper end of the lifting unit is provided with a bracket matched with the semicircular rotating shaft, and the semicircular rotating shaft rotates in the bracket;
the die is a rectangular hollow shell with the upper end and the lower end being respectively opened, a die cover is arranged at the upper end of the die, and a heating component is distributed in the hollow cavity of the shell; the lower ends of the left side wall and the right side wall of the mold are respectively provided with a bending part, a movable baffle is erected on the bending part, the movable baffle and the side wall of the mold form a charging cavity, and asphalt mixture is charged into the charging cavity;
the width of the support plate is smaller than the distance between each group of bent parts, and when the lifting unit moves upwards, the support plate moves upwards to enable the rolling wheel to abut against the movable baffle plate to move upwards;
the upper end of the vibration unit is fixed on the test support, and the lower end of the vibration unit is provided with the die cover.
2. The beam test piece forming device for asphalt mixture according to claim 1, wherein a plurality of groups of vertical grooves are correspondingly formed in the left side wall and the right side wall in the mold respectively, a partition plate is arranged in each group of vertical grooves, the lower end of each group of partition plates is provided with an inward bent part, a corresponding movable baffle is erected on the bent part, each group of partition plates and the corresponding movable baffle form a charging cavity with an opening at the upper end, and asphalt mixture is charged into the charging cavity.
3. The beam test piece molding device for asphalt mixture according to claim 2, wherein a moving baffle and two partitions constitute a set of charging members, and the molding device is equipped with a plurality of sets of charging members.
4. The beam test piece molding device for asphalt mixture according to claim 1, wherein the lifting unit is a screw lifter, the upper end of a lifting rod of the screw lifter is provided with a bracket, and a semicircular rotating shaft is installed in the bracket.
5. The apparatus for molding a beam test piece of asphalt mixture according to claim 4, wherein a gap is provided between the upper end of the bracket and the lower surface of the support plate.
6. The beam test piece forming device for the bituminous mixture according to claim 1, wherein a roller is disposed on an outer side wall of the mold, a guide rail is disposed at a position corresponding to the test support, and the roller moves along the guide rail to move the mold left and right.
7. The beam test piece molding device for asphalt mixture according to any one of claims 1 to 6, wherein the vibration unit comprises a vibration motor and a reaction frame, and a mold cover is installed on a reaction plate of the reaction frame.
8. The beam test piece molding device for asphalt mixture according to claim 1, wherein the heating component is a heating resistance wire.
9. The beam test piece molding device for asphalt mixture according to claim 1, wherein a displacement sensor is installed at the lifting part of the lifting unit.
10. A beam test piece forming method of an asphalt mixture is characterized by comprising the following steps:
step 1, installing partition plates in corresponding vertical grooves according to the width of a beam test piece required by a test, and erecting corresponding movable baffle plates on the partition plates to form corresponding charging cavities; adding an asphalt mixture to be formed into a charging cavity;
step 2, starting the heating part, and heating the material to the temperature required by the test; starting a vibration unit to vibrate and tap the asphalt mixture to be molded in the mold to form uniform materials to be pressed;
step 3, starting the lifting unit to enable the bracket to support the support plate to move upwards, and rolling the movable baffle plate by starting the rolling wheel and the support plate to rotate back and forth under the vibration effect when the rolling wheel is abutted against the movable baffle plate; and after the material on the movable baffle abuts against the die cover, continuously rolling for a preset time to obtain the beam test piece.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911378433.XA CN110987569A (en) | 2019-12-27 | 2019-12-27 | Beam test piece forming device and method for asphalt mixture |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911378433.XA CN110987569A (en) | 2019-12-27 | 2019-12-27 | Beam test piece forming device and method for asphalt mixture |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110793827A (en) * | 2019-11-10 | 2020-02-14 | 东北石油大学 | Lifting device for artificial rock core manufacturing |
| CN111562166A (en) * | 2020-07-14 | 2020-08-21 | 中南大学 | Shale physical model sample considering bedding microstructure, preparation method and preparation device |
| CN112378731A (en) * | 2020-12-10 | 2021-02-19 | 长安大学 | Pitch bending beam rheological test piece former |
| CN113008696A (en) * | 2021-03-25 | 2021-06-22 | 蚌埠市思创沥青路面工程有限公司 | Asphalt pavement low-temperature cracking resistance performance test system |
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2019
- 2019-12-27 CN CN201911378433.XA patent/CN110987569A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110793827A (en) * | 2019-11-10 | 2020-02-14 | 东北石油大学 | Lifting device for artificial rock core manufacturing |
| CN111562166A (en) * | 2020-07-14 | 2020-08-21 | 中南大学 | Shale physical model sample considering bedding microstructure, preparation method and preparation device |
| CN112378731A (en) * | 2020-12-10 | 2021-02-19 | 长安大学 | Pitch bending beam rheological test piece former |
| CN112378731B (en) * | 2020-12-10 | 2024-04-09 | 长安大学 | Asphalt bending beam rheological test specimen forming instrument |
| CN113008696A (en) * | 2021-03-25 | 2021-06-22 | 蚌埠市思创沥青路面工程有限公司 | Asphalt pavement low-temperature cracking resistance performance test system |
| CN113008696B (en) * | 2021-03-25 | 2024-05-17 | 蚌埠市思创沥青路面工程有限公司 | Asphalt pavement low-temperature cracking resistance test system |
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