Road petroleum asphalt ductility test sample preparation mold

Abstract

The utility model discloses a sample preparation mold for a road petroleum asphalt ductility test, which relates to the technical field of road petroleum asphalt ductility tests and comprises an outer mold, an end mold and a shoulder mold which are combined into a mold main body, and a mold cavity is formed in the mold main body. The face, facing the mold cavity, of the outer mold, the face, facing the mold cavity, of the end mold and the face, facing the mold cavity, of the shoulder mold are each provided with a silica gel layer used for preventing asphalt adhesion. According to the sample preparation mold for the road petroleum asphalt ductility test, the contact surface of the outer mold and the petroleum asphalt, the contact surface of the end mold and the petroleum asphalt and the contact surface of the shoulder mold and the petroleum asphalt are all provided with the silica gel films which are not adhered to the petroleum asphalt, so that compared with the use of a separant, the sample preparation mold for the road petroleum asphalt ductility test can be used without early-stage preparation; and normal demolding of the petroleum asphalt ductility test sample preparation can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of road petroleum asphalt ductility testing, in particular to a road petroleum asphalt ductility test sample preparation die. Background Art

[0002] Petroleum asphalt has high viscosity and good durability, but low plasticity, and is often used as a pavement material in road construction. Road petroleum asphalt is mainly used to build asphalt pavements for high-grade highways, urban roads, airport runways, etc., and can also be used to repair cracks, potholes and other damage on the road surface. Asphalt ductility, or elongation, is one of the three major indicators of asphalt. It is an indicator of asphalt plasticity and refers to the length of an asphalt sample when it is stretched to the point of fracture at a specified temperature and a specified tensile rate. The greater the ductility of road petroleum asphalt, the better its plasticity. As the most basic control indicator, the ductility of road petroleum asphalt directly affects the usability and safety of road projects.

[0003] The "Testing Procedures for Asphalt and Asphalt Mixtures for Highway Engineering (JTG / E 20-2011)" specifies requirements for the ductility of petroleum asphalt at a temperature of 25°C and a tensile rate of 5 cm / min. The "Asphalt Ductility Test Method (GB / T4508-2010)" specifies the following method for measuring asphalt ductility: a molten sample is poured into a dedicated mold, cooled to room temperature, then placed in a water bath maintained at the test temperature. The portion of the sample protruding from the mold is trimmed with a hot knife, and the center of the mold is returned to the water bath. After a specified period of time, the sample is transferred to a ductility tester for testing. The length of the asphalt specimen when stretched to fracture at a specified temperature and speed is recorded. The "Asphalt Ductility Test Method (GB / T 4508-2010)" provides a sample preparation mold for the ductility test, consisting of two curved end molds and two side molds made of brass. When preparing the sample specimen, a brass plate or glass plate is used as the base plate (support plate), and an isolation agent prepared by mixing two parts glycerin and one part talcum powder (by mass) is applied to the end mold, side mold, and bottom plate. However, in the actual road petroleum asphalt ductility test, the following problems exist: (1) The isolation agent needs to be prepared before each test, and the isolation effect of the isolation agent is poor. The asphalt sample often adheres to the mold, making it difficult to clean, the workload is large, and the time-consuming and labor-intensive process is poor. (2) The curved end mold, side mold, and bottom plate are independent, and the bottom plate is coated with an isolation agent. When scraping off the asphalt sample that protrudes from the mold, the curved end mold and side mold are very likely to slide, causing the asphalt sample specimen to deform and the surface to be uneven, affecting the test results. The sample needs to be repeated, which is inefficient. Therefore, there is an urgent need for a convenient and effective processing method to overcome the above-mentioned shortcomings in the road petroleum asphalt ductility test. Utility Model Content

[0004] The purpose of the present invention is to provide a sample preparation mold for a road petroleum asphalt ductility test to solve the problems existing in the above-mentioned prior art. The present invention provides a silicone film that does not adhere to the petroleum asphalt on the contact surface between the outer mold and the petroleum asphalt, the contact surface between the end mold and the petroleum asphalt, and the contact surface between the shoulder mold and the petroleum asphalt. Compared with the use of an isolation agent, the sample preparation mold for a road petroleum asphalt ductility test provided by the present invention can be used without the need for prior preparation, and can ensure normal demolding of the petroleum asphalt ductility test sample preparation.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The utility model provides a sample preparation mold for a road petroleum asphalt ductility test, comprising an outer mold, an end mold and a shoulder mold. The outer mold, the end mold and the shoulder mold are combined to form a mold body, a mold cavity is formed in the mold body, and a silicone layer for preventing asphalt adhesion is provided on one side of the outer mold facing the mold cavity, one side of the end mold facing the mold cavity and one side of the shoulder mold facing the mold cavity.

[0007] Preferably, the shoulder mold is made of silicone.

[0008] Preferably, the outer mold includes a bottom plate, and the silicone layer is arranged on a side of the bottom plate facing the mold cavity.

[0009] Preferably, the base plate is made of silicone.

[0010] Preferably, the outer mold further includes side plates, the side plates and the bottom plate together form a mold groove, and the end mold and the shoulder mold are arranged in the mold groove and in contact with the side plates.

[0011] Preferably, a first connecting portion is provided on the end mold, and a second connecting portion matching the first connecting portion is provided on the bottom plate.

[0012] Preferably, the first connecting portion is an end die hole, and the second connecting portion is a positioning rod.

[0013] Preferably, the thickness of the silica gel layer is 0.5 mm to 1 mm.

[0014] Preferably, the material of the end mold is brass.

[0015] Preferably, the end mold is provided with a first protrusion for combining with the shoulder mold, and the shoulder mold is provided with a second protrusion matching the first protrusion.

[0016] Compared with the prior art, the utility model has achieved the following technical effects:

[0017] The utility model provides a sample preparation mold for a road petroleum asphalt ductility test. The utility model provides a silicone film that does not adhere to the petroleum asphalt on the contact surface between the outer mold and the petroleum asphalt, the contact surface between the end mold and the petroleum asphalt, and the contact surface between the shoulder mold and the petroleum asphalt. Compared with the use of an isolation agent, the sample preparation mold for a road petroleum asphalt ductility test provided by the utility model can be used without prior preparation and can ensure normal demolding of the petroleum asphalt ductility test sample.

[0018] Compared with the prior art, the present invention also achieves the following technical effects:

[0019] 1. The bottom plates of the middle shoulder mold and outer mold of this utility model are made of silicone, which has good anti-adhesion ability. At the same time, the silicone is soft and easy to demould;

[0020] 2. The side plates of the outer mold in the present invention form a good constraint on the shoulder mold and the end mold. When scraping off excess asphalt samples, the shoulder mold and the end mold can be stably fixed in place without sliding. The first connecting part of the end mold and the second connecting part of the outer mold are fixed, and the first protrusion on the end mold and the second protrusion on the shoulder mold cooperate to form a limiting structure, which further improves the stability of the shoulder mold and the end mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of the end mold provided in an embodiment of the present utility model;

[0023] Figure 2 A schematic structural diagram of a shoulder mold provided by an embodiment of the present utility model;

[0024] Figure 3 A schematic diagram of the assembly of the end mold and the shoulder mold provided in an embodiment of the present utility model;

[0025] Figure 4 A schematic top view of the assembly of the end mold and the shoulder mold provided in an embodiment of the present utility model;

[0026] Figure 5 A schematic structural diagram of an outer mold provided in an embodiment of the present utility model;

[0027] Figure 6 A schematic diagram of the assembly of a sample preparation mold for a road petroleum asphalt ductility test provided by an embodiment of the present utility model;

[0028] Figure 7A schematic diagram of the structure after the sample is cast according to an embodiment of the present invention;

[0029] Figure 8 A schematic structural diagram of a sample preparation mold for a road petroleum asphalt ductility test provided in an embodiment of the present invention.

[0030] Among them, 11, end mold; 12, silicone layer; 13, end mold hole; 2, shoulder mold; 3, outer mold; 31, mold groove; 32, positioning rod; 4, road petroleum asphalt sample. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The purpose of the present invention is to provide a sample preparation mold for a road petroleum asphalt ductility test to solve the problems existing in the above-mentioned prior art. The present invention provides a silicone film that does not adhere to the petroleum asphalt on the contact surface between the outer mold and the petroleum asphalt, the contact surface between the end mold and the petroleum asphalt, and the contact surface between the shoulder mold and the petroleum asphalt. Compared with the use of an isolation agent, the sample preparation mold for a road petroleum asphalt ductility test provided by the present invention can be used without the need for prior preparation, and can ensure normal demolding of the petroleum asphalt ductility test sample preparation.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0034] like Figures 1 to 6 As shown, the utility model provides a road petroleum asphalt ductility test sample preparation mold, including an outer mold 3, an end mold 11 and a shoulder mold 2. The outer mold 3, the end mold 11 and the shoulder mold 2 are combined into a mold body, and a mold cavity is formed in the mold body. The side of the outer mold 3 facing the mold cavity, the side of the end mold 11 facing the mold cavity and the side of the shoulder mold 2 facing the mold cavity are all provided with a silicone layer 12 for preventing asphalt adhesion. Under normal circumstances, the melting temperature of road petroleum asphalt does not exceed 180 degrees Celsius, which is much lower than the ignition point of silicone. Therefore, the silicone layer will not be ignited by the road petroleum asphalt and can maintain a good shape for a long time. The silicone does not adhere to the road petroleum asphalt, ensuring that the road petroleum asphalt ductility test sample preparation is smoothly demolded and will not be damaged. In a preferred embodiment, the material of the shoulder mold 2 is silicone, and the shoulder mold 2 can be manufactured by an integrated molding process, which reduces the difficulty of production.

[0035] like Figure 5As shown, the outer mold 3 includes a bottom plate, and a silicone layer is provided on a side of the bottom plate facing the mold cavity. In a preferred embodiment, the material of the bottom plate is silicone.

[0036] like Figure 5 As shown, the outer mold 3 also includes side panels, and the side panels and the bottom panel together form a mold groove 31. The end mold 11 and the shoulder mold 2 are arranged in the mold groove 31 and in contact with the side panels. The side panels can limit the end mold 11 and the shoulder mold 2. The end mold 11 and the shoulder mold 2 will not move after being impacted by external force, and the mold can be kept in a stable state. A first connecting portion is provided on the end mold 11, and a second connecting portion matching the first connecting portion is provided on the bottom panel. The combination of the first connecting portion and the second connecting portion can play a positioning role, so that the installation position of the end mold 11 is correct to ensure that the shape of the final sample meets the requirements. The combination of the first connecting portion and the second connecting portion can also play a fixing role to enhance the impact resistance of the end mold 11. In a preferred embodiment, as shown Figure 1 and Figure 5 As shown, the first connecting portion is the end die hole 13 , and the second connecting portion is the positioning rod 32 .

[0037] like Figure 3 and Figure 4 As shown, the end mold 11 is provided with a first protrusion for combining with the shoulder mold 2, and the shoulder mold 2 is provided with a second protrusion matching the first protrusion. The first protrusion and the second protrusion are combined to form a mutual limit, thereby enhancing the combination reliability of the end mold 11 and the shoulder mold 2. A block or a groove can also be provided on the end mold 11, and the shoulder mold 2 is provided with a groove or a block matching the end mold 11.

[0038] In a preferred embodiment, the thickness of the silica gel layer is 0.5 mm to 1 mm.

[0039] In a preferred embodiment, the material of the end die 11 is brass, which is tensile-resistant and wear-resistant. When performing an ductility test, the end die 11 made of brass can be used as a tensile fixture.

[0040] The utility model also provides a method for using a sample preparation mold based on a road petroleum asphalt ductility test, comprising the following steps:

[0041] 1) Mold assembly, such as Figure 6 As shown, the end mold holes 13 of the two end molds 1 are respectively sleeved on the positioning rods 32 of the outer mold 3, and the two side molds 2 are located between the two end molds 1;

[0042] 2) Casting samples, such as Figure 7 As shown, a road petroleum asphalt sample 4 heated to be easily poured is slowly poured into the cavity in the middle of the mold. After cooling at room temperature for 20 to 30 minutes, a hot straight knife or shovel is used to scrape out the road petroleum asphalt sample 4 protruding from the mold.

[0043] 3) Water bath cooling: Place the mold and road petroleum asphalt sample 4 in a water bath at a specified temperature and cool for 85 to 95 minutes;

[0044] 4) Tests, such as Figure 8 As shown, the mold and the road petroleum asphalt sample 4 are taken out, and the outer mold 3 and the side mold 2 are removed in turn to carry out the ductility test.

[0045] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A sample preparation mold for a road petroleum asphalt ductility test, characterized by: The invention comprises an outer mold (3), an end mold (11) and a shoulder mold (2); the outer mold (3), the end mold (11) and the shoulder mold (2) are combined to form a mold body; a mold cavity is formed in the mold body; a silicone layer (12) for preventing asphalt adhesion is provided on one side of the outer mold (3) facing the mold cavity, one side of the end mold (11) facing the mold cavity and one side of the shoulder mold (2) facing the mold cavity.

2. The sample preparation mold for road petroleum asphalt ductility test according to claim 1, characterized in that: The material of the shoulder mold (2) is silicone.

3. The sample preparation mold for road petroleum asphalt ductility test according to claim 1, characterized in that: The outer mold (3) comprises a bottom plate, and the silicone layer is arranged on a side of the bottom plate facing the mold cavity.

4. The sample preparation mold for road petroleum asphalt ductility test according to claim 3, characterized in that: The material of the bottom plate is silica gel.

5. The sample preparation mold for road petroleum asphalt ductility test according to claim 3 or 4, characterized in that: The outer mold (3) further comprises a side plate, wherein the side plate and the bottom plate together form a mold groove (31), and the end mold (11) and the shoulder mold (2) are arranged in the mold groove (31) and in contact with the side plate.

6. The sample preparation mold for road petroleum asphalt ductility test according to claim 5, characterized in that: A first connecting portion is provided on the end mold (11), and a second connecting portion matching the first connecting portion is provided on the bottom plate.

7. The sample preparation mold for road petroleum asphalt ductility test according to claim 6, characterized in that: The first connecting portion is an end die hole (13), and the second connecting portion is a positioning rod (32).

8. The sample preparation mold for road petroleum asphalt ductility test according to claim 1 or 3, characterized in that: The thickness of the silica gel layer is 0.5 mm to 1 mm.

9. The sample preparation mold for road petroleum asphalt ductility test according to claim 1, characterized in that: The material of the end die (11) is brass.

10. The sample preparation mold for road petroleum asphalt ductility test according to claim 1, characterized in that: The end mold (11) is provided with a first protrusion for combining with the shoulder mold (2), and the shoulder mold (2) is provided with a second protrusion matching the first protrusion.

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