Asphalt Marshall test piece forming mold assembly

Abstract

An asphalt Marshall test piece forming mold assembly comprises a base, a mold body, a sleeve and a mold filling hopper, a clamping block used for being matched with an opening in the bottom of the mold body is arranged at the top of the base, and a lower clamping groove is further formed in the outer wall of the opening in the top of the mold body; an upper clamping groove matched with the lower clamping groove is formed in the inner wall of the opening in the bottom of the sleeve; the die filling hopper comprises a hopper body, a lower hopper opening of the hopper body is fixedly connected with an inserting barrel used for being matched with an opening in the top of the sleeve, and the connecting position of the inserting barrel and the lower hopper opening of the hopper body is of an arc-shaped structure. According to the utility model, the rigidity is stronger, the reusability is increased, the error in the loading process is reduced, the accuracy of an asphalt Marshall test is improved, and the quality of an asphalt road can be better ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to highway asphalt mixture test technical field especially, it is a kind of asphalt Marshall test piece forming mould assembly. BACKGROUND

[0002] Asphalt pavement is widely used in our country due to good road performance, and Marshall test has very important significance in asphalt mixture mix design and asphalt pavement construction process quality control, so it is necessary to control the accuracy of test piece preparation in Marshall test process.Currently, the method commonly used in the preparation of asphalt Marshall test piece is to divide the uniformly mixed asphalt mixture into the required amount of sample by quartation first, then transfer the mixture into test mould with small shovel after reaching the required temperature for test, and carry out compaction test.However, the existing test mould will cause aggregate particle loss during loading process with small shovel, which will cause the height of Marshall test piece to be lower, the density to be smaller and the void ratio to be larger under the same compaction work, and it is difficult to meet the needs of actual test. SUMMARY

[0003] The utility model provides a kind of asphalt Marshall test piece forming mould assembly, which can improve the loading mode of asphalt mixture, reduce the mass loss of asphalt mixture during loading process, to improve the accuracy of Marshall test piece preparation process.

[0004] The technical problem to be solved by the utility model is solved by the following technical scheme.The utility model is a kind of asphalt Marshall test piece forming mould assembly, including base, mould body, sleeve and loading hopper, the top of base is provided with clamping block for cooperating with the bottom opening of mould body, and lower clamping groove is further provided on the outer wall of the top opening of mould body, and upper clamping groove is provided on the inner wall of the bottom opening of sleeve and cooperates with lower clamping groove;The loading hopper includes hopper body, and plug-in barrel is fixedly connected to the lower hopper opening of hopper body for cooperating with the top opening of sleeve, and the connection between plug-in barrel and lower hopper opening of hopper body is arc-shaped structure.

[0005] The technical problem to be solved by the utility model can be further realized by the following technical scheme, for the asphalt Marshall test piece forming mould assembly described above, the hopper body is bowl-shaped structure.

[0006] The technical problem to be solved by the utility model can be further realized by the following technical scheme, for the asphalt Marshall test piece forming mould assembly described above, the plug-in barrel, sleeve, mould body and clamping block are all cylindrical.

[0007] The technical problems to be solved by the utility model further can be further realized through following technical schemes, for the asphalt Marshall test piece forming die assembly, the outer diameter of the insert tube is consistent with the inner diameter of the sleeve, the inner diameter and the outer diameter of the sleeve are consistent with the inner diameter and the outer diameter of the die body, the outer diameter of the clamping block is consistent with the inner diameter of the die body.

[0008] The technical problems to be solved by the utility model further can be further realized through following technical schemes, for the asphalt Marshall test piece forming die assembly, the outer wall of the opening at the bottom of the die body is further provided with an annular groove convenient for fixing by using a clamp.

[0009] The technical problems to be solved by the utility model further can be further realized through following technical schemes, for the asphalt Marshall test piece forming die assembly, the insert tube is fixedly connected with the lower hopper opening of the bucket body in a welding mode.

[0010] The technical problems to be solved by the utility model further can be further realized through following technical schemes, for the asphalt Marshall test piece forming die assembly, the base is in a disc shape or a cuboid shape.

[0011] The technical problems to be solved by the utility model further can be further realized through following technical schemes, for the asphalt Marshall test piece forming die assembly, the base, the die body, the sleeve and the die loading bucket are made of high carbon steel or tool steel.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1, the utility model is provided with the die loading bucket, can more easily pour the asphalt mixture into the test die for the operator, can possibly avoid the phenomenon that the aggregate particles are lost, guarantees the accuracy in the preparation process of the Marshall test piece, meanwhile, the connecting portion of the insert tube and the bucket body is in an arc shape, the asphalt mixture falls smoothly, helps to complete the die loading work quickly,

[0014] 2, the utility model is through the precise cooperation structure (such as the cooperation of the clamping block and the bottom of the die body, the butt joint of the upper and lower clamping grooves) between the base, the die body, the sleeve and the die loading bucket, effectively avoids the leakage or spilling phenomenon of the mixture in the traditional die loading mode, meanwhile, the close assembly structure guarantees the stability of the asphalt mixture in the filling process, significantly reduces the quality loss caused by improper operation or design defects, guarantees the accurate measurement of the Marshall test piece material,

[0015] 3, the utility model discloses a structure design of mould assembly is optimized, ensure that the uniform distribution and compactness of asphalt mixture in test mould, it is favorable to form structural compact, performance stable marshall test piece, this is important for accurately reflecting the real performance of asphalt mixture, evaluating its performance in practical application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the utility model;

[0017] Figure 2 It is Figure 1 A-A direction structural section view of the utility model;

[0018] Figure 3 It is a structure plan view of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below with the drawings of the utility model, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the range of protection of the utility model.

[0020] Referring to Figures 1-3 , an asphalt marshall test piece forming mold assembly, including base 5, mold body 4, sleeve 3 and mould loading bucket, base 5 as the basis of the whole assembly, its design fully considers stability and bearing capacity, preferably, the base 5 is disc-shaped or cuboid as a whole, facilitate effective dispersion test piece produced in the preparation process pressure, prevent the deformation or damage of assembly;Disc-shaped base 5 is convenient for rotating operation, and cuboid is more suitable for the fixed installation on some automatic or mechanized production line;

[0021] Mold body 4 is the key component of asphalt mixture forming, facilitate the uniform filling and compaction of asphalt mixture, in order to realize the installation of mold body 4, the top of base 5 is provided with the clamping block 6 for cooperating with the bottom opening of mold body 4, at the same time, the surface of base 5 is finely processed, ensure that the clamping block 6 at the bottom of mold body 4 is closely matched, gapless butt joint, further enhance the stability of the whole;Second, the outer wall on the bottom opening of mold body 4 is also provided with annular groove 7 for being fixed by using clamp, it is convenient to use clamp for additional fixing, improve the flexibility and safety of operation.

[0022] The sleeve 3 is an intermediate link between the mold body 4 and the mold loading bucket, and the cylindrical design ensures seamless connection with the mold body 4 and the mold loading bucket. A lower clamping groove 8 is arranged on the outer wall of the opening at the top of the mold body 4, and an upper clamping groove 9 is arranged on the inner wall of the opening at the bottom of the sleeve 3. The upper clamping groove 9 and the lower clamping groove 8 are matched with each other, so that the two are quickly and reliably connected, and the working efficiency is improved.

[0023] The design of the mold loading bucket facilitates the concentration and introduction of asphalt mixture into the mold body 4, reduces the waste and scattering of the mixture, and specifically, the mold loading bucket comprises a bucket body 1, and a plug-in sleeve 2 is fixedly connected with the lower bucket opening of the bucket body 1 for cooperation with the top opening of the sleeve 3. The connection between the plug-in sleeve 2 and the lower bucket opening of the bucket body 1 is in a circular arc structure, which not only simplifies the installation process, but also reduces the friction and resistance during assembly, protects the surface of the assembly from damage, and facilitates the smooth falling of the asphalt mixture.

[0024] Preferably, the bucket body 1 is in a bowl-shaped structure, and the plug-in sleeve 2 is fixedly connected with the lower bucket opening of the bucket body 1 by welding, which ensures the strength and durability of the connection, can withstand the weight of the mixture and the impact force during preparation, and can avoid deformation due to high temperature of the asphalt mixture, thereby increasing the reusability.

[0025] In actual use, the plug-in sleeve 2, the sleeve 3, the mold body 4 and the clamping block 6 are all in a cylindrical shape. The outer diameter of the plug-in sleeve 2 is consistent with the inner diameter of the sleeve 3, the inner diameter and the outer diameter of the sleeve 3 are consistent with the inner diameter and the outer diameter of the mold body 4, and the outer diameter of the clamping block 6 is consistent with the inner diameter of the mold body 4, which ensures the compactness of the structure and the stability of the connection, and avoids the influence of shaking on accuracy during loading.

[0026] The materials of the base 5, the mold body 4, the sleeve 3 and the mold loading bucket are high-carbon steel or tool steel, which has high strength, high wear resistance and good corrosion resistance, and can maintain stable performance in harsh working environment. At the same time, these materials also have good processing performance, which is convenient for fine processing and customized production to meet the needs of different users.

[0027] The specific working process of the utility model is as follows:

[0028] 1. Preparation stage

[0029] Material preparation: first, prepare an appropriate amount of asphalt mixture, and ensure that its temperature meets the preparation requirements, generally not less than a certain temperature (such as 135°C) to ensure the fluidity and compaction effect of the mixture;

[0030] Preheating of assembly: Put the mold assembly (including base 5, mold body 4, sleeve 3 and mold loading bucket) into a preheating device such as an oven and heat it to a certain temperature (set according to actual needs) to reduce the temperature loss of the mixture during filling and ensure the molding quality;

[0031] 2. Filling stage

[0032] Assembly: Place the preheated base 5 on the water platform, tightly connect the mold body 4 to the base 5 through the clamping block 6, then put the sleeve 3 on the mold body 4 and ensure that the upper and lower clamping grooves are aligned and firmly connected;

[0033] Loading: Use the mold loading bucket to pour the preheated asphalt mixture evenly into the mold body 4. Due to the bowl-shaped structure of the mold loading bucket, the mixture can flow smoothly into the mold, reducing waste and scattering;

[0034] Initial compaction: Use a knife or similar tool to initially insert and mix the mixture to expel air and voids, ensuring uniform distribution of the mixture in the mold; the number and method of insertion should be according to the specification requirements, such as 15 times around the perimeter and 10 times in the middle;

[0035] 3. Compaction stage

[0036] Temperature check: Before compaction, use a thermometer to check the temperature of the mixture center to ensure it meets the compaction temperature requirements;

[0037] Compaction operation: Place the mold together with the base 5 on the compaction platform and fix it, and place a round paper with low oil absorption on top of the mixture; then insert the compaction head equipped with a compaction hammer and guide rod into the mold, start the motor or manually operate the compaction hammer to drop freely from a specified height (such as 457mm) to compact the mixture; the number of compactions is determined according to the specification requirements, generally 75 times, 50 times or 35 times, etc.; for large Marshall test pieces, the number of compactions may be more.

[0038] 4. Cooling and demolding

[0039] Cooling: After compaction, immediately remove the sleeve 3 and base 5, and place the mold with the test piece horizontally to cool to room temperature; if necessary, methods such as electric fan blowing or water immersion cooling can be used to accelerate the cooling process, but note that water immersion demolding method cannot be used for measuring physical indicators such as density and void ratio.

[0040] Demolding: After the test piece cools to room temperature, use the demolding machine to remove the test piece from the mold; be careful when demolding to avoid damaging the test piece;

[0041] Subsequent processing: According to needs, perform subsequent processing on the removed test piece, such as cutting, marking, etc., to facilitate subsequent testing and analysis.

[0042] Through the above process, the Marshall specimen preparation is completed, which can be used for subsequent asphalt mixture performance test and analysis. The whole working process needs to strictly follow the specification requirements to ensure the preparation quality of the specimen and the accuracy of the test results.

Claims

1. An asphalt Marshall specimen forming die assembly, characterized by: It includes a base, a mold body, a sleeve and a mold loading bucket. A clamping block for cooperating with the bottom opening of the mold body is provided on the top of the base, a lower clamping groove is also provided on the outer wall of the top opening of the mold body, and an upper clamping groove for cooperating with the lower clamping groove is provided on the inner wall of the bottom opening of the sleeve; the mold loading bucket includes a bucket body, and a plug-in sleeve for cooperating with the top opening of the sleeve is fixedly connected to the lower bucket mouth of the bucket body, and the connection between the plug-in sleeve and the lower bucket mouth of the bucket body is an arc-shaped structure.

2. The asphalt Marshall specimen forming die assembly according to claim 1, characterized in that: The bucket body is a bowl-shaped structure.

3. The asphalt Marshall specimen forming die assembly according to claim 1 or 2, characterized in that: The plug-in cylinder, sleeve, mold body and clamping block are all cylindrical.

4. The asphalt Marshall specimen forming die assembly according to claim 3, characterized in that: The outer diameter of the plug-in cylinder is consistent with the inner diameter of the sleeve, the inner diameter and outer diameter of the sleeve are consistent with the inner diameter and outer diameter of the mold body, and the outer diameter of the clamping block is consistent with the inner diameter of the mold body.

5. The asphalt Marshall specimen forming die assembly according to claim 1, characterized in that: An annular groove is also provided on the outer wall of the bottom opening of the mold body for facilitating fixation with a clamp.

6. The asphalt Marshall specimen forming die assembly according to claim 1, characterized in that: The plug-in tube is fixedly connected to the lower bucket opening of the bucket body by welding.

7. The asphalt Marshall specimen forming die assembly according to claim 1, characterized in that: The base is in the shape of a disk or a cuboid as a whole.

8. The asphalt Marshall specimen forming die assembly according to claim 1, characterized in that: The base, the mold body, the sleeve and the mold bucket are made of high carbon steel or tool steel.

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