Asphalt cement double-end notch tension experiment mold

Abstract

The utility model relates to the technical field of pavement material performance testing, in particular to an asphalt cement double-end notch tension experimental mold which comprises a base, L-shaped check blocks are correspondingly arranged on two side faces, and the thickness of the portion, fixedly connected with the base, of each check block is smaller than that of the base; when the stop block is fixedly connected with the base, corresponding side grooves are formed between the base and the stop block by taking the lower surface of the base as a reference; the side mold comprises two side plates, the thickness of the side plates is consistent with the width of the side grooves, and the side mold is clamped on the base through the side grooves; the end die is placed between the side dies, and the lower surface of the end die is flush with the middle protruding face of the base. According to the utility model, the traditional mold is improved, so that the mold can be suitable for asphalt cement tests, the mold turning process is simple, the mold deformation in a high-temperature environment is effectively avoided, the stability of the mold size is ensured, the sample forming precision is improved, the asphalt cement double-end notch tension test is promoted to be smoothly carried out, and a reliable guarantee is provided for the test.

Description

Technical Field

[0001] The utility model relates to the technical field of pavement material performance testing, in particular to a double-edge notch tension test die for asphalt binder. Background Art

[0002] Asphalt pavement fatigue cracking has always been one of the common diseases that trouble engineering technicians. A large number of on-site pavement measurements and laboratory tests show that the anti-fatigue cracking performance of asphalt concrete pavement mainly depends on the anti-fatigue performance of asphalt binder. To solve this problem, the double-edge notch tension test (DENT) is widely used. This test method can be completed by using a force-measuring extensometer and a silica gel mold, and on this basis, the critical crack tip opening displacement (CTOD) is proposed as the key index to evaluate the anti-fatigue performance of asphalt binder. This method helps to improve the fatigue quality control level of domestic asphalt pavement and provides a scientific basis for engineering practice.

[0003] However, through experiments, it is confirmed that the hardness of the silica gel mold is not suitable for the test of asphalt binder. Because the high temperature during mold casting will cause the mold to deform, resulting in the deviation of the original ligament width dimension of the mold. The ligament width is the key parameter for calculating the critical crack tip opening displacement (CTOD), and its accuracy requirement reaches 0.01 mm. The deformation of the mold caused by high temperature will directly lead to the inaccuracy of the test results, thus affecting the evaluation of the anti-fatigue performance.

[0004] To solve the above problems, a double-edge notch tension test die for asphalt binder is designed.

[0005] The information disclosed in this background art section is only intended to deepen the understanding of the overall background art of the utility model, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Utility Model

[0006] The utility model provides a double-edge notch tension test die for asphalt binder, thus effectively solving the problems in the background art.

[0007] To achieve the above object, the technical solution adopted by the utility model is: a double-edge notch tension test die for asphalt binder, comprising:

[0008] A base, on which two corresponding stoppers are arranged on two side faces of the base. The stopper is integrally L-shaped, and the thickness of the part fixedly connected with the base is less than the thickness of the base;

[0009] Wherein, when the stopper is fixedly connected with the base, taking the lower surface of the base as a reference, two corresponding side grooves are formed between the base and the stopper;

[0010] Side mold, the side mold includes two side plates, the thickness of the two side plates is consistent with the width of the side groove, and the side mold is clamped on the base through the side groove;

[0011] End mold, the end mold is placed in the middle of the side mold, and the lower surface is closely flush with the middle convex surface of the base.

[0012] Further, convex triangles are provided on the sides of the two side plates;

[0013] Wherein, when the side mold is clamped on the base, the convex triangles face the inside of the side mold.

[0014] Further, the sizes of the convex triangles on different side plates are different, and different side molds can be clamped on the base according to experimental requirements.

[0015] Further, the end mold includes two end plates, and a U-shaped groove is provided at one end of the end plate;

[0016] Wherein, when the end mold is placed in the middle of the side mold, the U-shaped groove faces the inside of the end mold.

[0017] Further, positioning holes are provided in the middle of the stopper and the side plate, and the positioning holes are used in cooperation with bolts;

[0018] Wherein, when the stopper is aligned with the positioning hole, the bolt passes through the positioning hole to fix the whole mold.

[0019] Further, taking holes are provided at the tops of the two end plates, and the taking holes are used for taking and moving the end plates.

[0020] Further, the whole mold is made of metal material.

[0021] Further, anti-adhesive coatings are applied to the inner surfaces of the side mold and the end mold, and the anti-adhesive coatings are used to prevent asphalt binder from adhering to the surface of the mold.

[0022] The beneficial effects of the present utility model are as follows: By improving the traditional mold design, the mold can be applied to the test of asphalt binder, and the mold turning process is simpler, effectively avoiding the deformation of the mold under high temperature environment and ensuring the dimensional stability of the mold, thereby improving the precision and consistency of specimen forming, promoting the more smooth progress of the double-end notch tension test of asphalt binder, and providing a reliable guarantee for the experiment. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of a double-end notch tension experiment mold for asphalt binder;

[0025] Reference numerals: 1, base; 11, stop block; 12, side groove; 2, side mold; 21, side plate; 22, convex triangle; 3, end mold; 31, end plate; 31A, taking hole; 31B, U-shaped groove; 4, positioning hole; 5, bolt. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0028] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0029] As Figure 1 shown, a double-end notch tension experiment mold for asphalt binder includes:

[0030] A base 1, with stop blocks 11 correspondingly arranged on two sides of the base 1. The stop blocks 11 are integrally L-shaped, and the thickness of the part fixedly connected to the base 1 is less than the thickness of the base 1;

[0031] When the stop block 11 is fixedly connected to the base 1, with the lower surface of the base 1 as the reference, two corresponding side grooves 12 are formed between the base 1 and the stop block 11.

[0032] The side mold 2, the side mold 2 includes two side plates 21, and the thickness of the two side plates 21 is the same as the width of the side groove 12. The side mold 2 is clamped on the base 1 through the side groove 12.

[0033] The end mold 3, the end mold 3 is placed in the middle of the side mold 2, and the lower surface is closely flush with the middle convex surface of the base 1.

[0034] First, the base 1 needs to be placed flat to ensure that its lower surface is the reference; then, the two side plates 21 of the side mold 2 are clamped in the side grooves 12 of the base 1 to ensure that the side plates 21 are closely fitted with the base 1; next, the end mold 3 is placed in the middle of the side mold 2 so that its lower surface is flush with the middle convex surface of the base 1; finally, the asphalt binder is poured into the mold, evenly distributed and compacted, and waited for it to cure and form.

[0035] By improving the traditional mold design, the mold can be applied to the test of asphalt binder, and the mold turning process is simpler, effectively avoiding the deformation of the mold in the high-temperature environment, and ensuring the stability of the mold size, thereby improving the accuracy and consistency of the specimen forming, promoting the more smooth progress of the double-end notch tension test of asphalt binder, and providing a reliable guarantee for the experiment.

[0036] In this embodiment, convex triangles 22 are provided on the side surfaces of the two side plates 21.

[0037] Among them, when the side mold 2 is clamped on the base 1, the convex triangles 22 face the inside of the side mold 2.

[0038] Convex triangles 22 are provided on the side surfaces of the two side plates 21. Among them, when the side mold 2 is clamped on the base 1, the convex triangles 22 face the inside of the side mold 2. The convex triangles 22 can directly form double-end notches in the specimen, thereby simplifying the mold structure and ensuring the consistency and accuracy of the specimen notches.

[0039] In this embodiment, the sizes of the convex triangles 22 on different side plates 21 are different, and different side molds 2 can be clamped on the base 1 according to the experimental requirements.

[0040] Flexibly adjust the notch size of the specimen according to the specific experimental requirements. By replacing different-sized side molds 2, it is convenient to conduct tests under various conditions, increasing the applicable range and flexibility of the experiment. And the design of different-sized convex triangles 22 ensures the consistency and accuracy of the specimen notches under various experimental conditions, thereby improving the reliability and comparability of the experimental data. This improvement makes the experimental operation more convenient and also improves the accuracy and reliability of the experimental results.

[0041] In this embodiment, the end mold 3 includes two end plates 31, and one end of the end plate 31 is provided with a U-shaped groove 31B;

[0042] When the end mold 3 is placed in the middle of the side mold 2 , the U-shaped groove faces the inside of the end mold 3 .

[0043] The U-shaped groove 31B can better fix and guide the asphalt binder to form a uniform double-ended notch in the mold. The existence of the U-shaped groove 31B also provides additional space and shape control, so that the specimen is subjected to more uniform force during the curing process, reducing stress concentration, thereby improving the quality and consistency of the specimen, facilitating demolding and cleaning, simplifying experimental operations, and improving work efficiency.

[0044] In this embodiment, the middle of the stopper 11 and the side plate 21 are both provided with positioning holes 4, and the positioning holes 4 are used in conjunction with the bolts 5;

[0045] When the stopper 11 is aligned with the positioning hole 4, the bolt 5 passes through the positioning hole 4 to fix the entire mold.

[0046] Through the cooperation of the bolt 5 and the positioning hole 4, the stability and consistency of each part of the mold during use can be ensured. The bolt 5 fixes the mold so that it is not easy to loosen or deform under high temperature and high pressure conditions, thereby improving the accuracy and consistency of sample molding, and also facilitating rapid assembly and disassembly, thereby improving the efficiency of experimental operations. The bolt 5 fixation also enhances the durability of the mold, reduces sample quality problems caused by mold loosening, and ensures the reliability and repeatability of the experimental results.

[0047] In this embodiment, a taking hole 31A is provided on the top of the two end plates 31 , and the taking hole 31A is used to take and move the end plates 31 .

[0048] The taking hole 31A facilitates the experimental operator to grasp and move the end plate 31, making the installation and disassembly process of the mold faster and more labor-saving. Through the taking hole 31A, direct contact with high temperature or harmful materials during operation can be effectively avoided, thereby increasing the safety of operation. The design of the taking hole 31A also improves work efficiency, reduces operation time, and reduces the risk of damage caused by manual operation, thereby extending the service life of the mold.

[0049] In this embodiment, the entire mold is made of metal.

[0050] The metal material has high strength and durability, can withstand the experimental environment under high temperature and high pressure conditions, is not easy to deform and damage. The metal material has good thermal conductivity, can conduct heat evenly, ensure the uniform curing of the asphalt binder in the mold, and improve the forming quality of the specimen. The surface of the metal mold is smooth, which is convenient for cleaning and maintenance, reduces the workload of post-experiment processing, improves the efficiency of experimental operation, and the use of the metal material also increases the service life of the mold, reduces the replacement cost during long-term use, and provides a more stable and reliable tool guarantee for the experiment.

[0051] In this embodiment, anti-adhesive coatings are applied to the inner surfaces of the side mold 2 and the end mold 3. The anti-adhesive coatings are used to prevent the asphalt binder from adhering to the mold surface.

[0052] The anti-adhesive coatings effectively prevent the asphalt binder from adhering to the mold surface, thus simplifying the demolding process of the specimen, reducing the risk of specimen damage, ensuring the integrity and surface quality of the specimen, improving the accuracy of the experimental results, and the anti-adhesive coatings also make the mold cleaning more convenient, reducing the cleaning time and workload after the experiment. The use of the anti-adhesive coatings also helps to protect the mold surface, reduce wear and corrosion, extend the service life of the mold, and thus reduce the experimental cost.

[0053] Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A double-end notched tension test mold for asphalt binder, characterized in that: include: A base, wherein two side surfaces of the base are correspondingly provided with stoppers, the stoppers are overall L-shaped, and the thickness of the portion fixedly connected to the base is less than the thickness of the base; Wherein, when the stopper is fixedly connected to the base, two corresponding side grooves are formed between the base and the stopper with the lower surface of the base as a reference; A side mold, the side mold comprising two side plates, the thickness of the two side plates being consistent with the width of the side groove, and the side mold being clamped on the base through the side groove; The end mold is placed in the middle of the side mold, and the lower surface is flush with the middle raised surface of the base.

2. The double-end notched tension test mold for asphalt binder according to claim 1, characterized in that: The sides of the two side panels are provided with convex triangles; Wherein, when the side mold is clamped on the base, the convex triangle faces the inside of the side mold.

3. The double-end notched tension test mold for asphalt binder according to claim 2, characterized in that: The sizes of the convex triangles on different side panels are different, and different side molds can be snapped onto the base according to experimental requirements.

4. The double-end notched tension test mold for asphalt binder according to claim 1, characterized in that: The end mold includes two end plates, and one end of the end plate is provided with a U-shaped groove; Wherein, when the end mold is placed in the middle of the side mold, the U-shaped groove faces the inside of the end mold.

5. The double-end notched tension test mold for asphalt binder according to claim 1, characterized in that: The stopper and the middle of the side plate are both provided with positioning holes, and the positioning holes are used in conjunction with bolts; When the stopper is aligned with the positioning hole, the bolt passes through the positioning hole to fix the entire mold.

6. The double-end notched tension test mold for asphalt binder according to claim 4, characterized in that: The tops of the two end plates are provided with taking holes, and the taking holes are used to take and move the end plates.

7. The double-end notched tension test mold for asphalt binder according to claim 1, characterized in that: The entire mold is made of metal.

8. The double-end notched tension test mold for asphalt binder according to claim 1, characterized in that: The inner surfaces of the side mold and the end mold are coated with an anti-stick coating, and the anti-stick coating is used to prevent the asphalt binder from adhering to the mold surface.

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