Concrete test block mold for asphalt concrete tensile test

Abstract

The utility model discloses a concrete test block mould for asphalt concrete tensile test, which comprises a side mould plate frame, the side mould plate frame comprises a straight mould part and curved mould parts integrally connected to two ends of the straight mould part, the straight mould part is two straight plates parallelly arranged on a bottom mould plate at intervals, the curved mould parts are arc frames, and the curved mould parts are arranged on the bottom mould plate at intervals. The inner diameter of the bent mold part is larger than the inner width of the straight mold part, a bottom mold plate is arranged at the bottom of the side mold plate frame, and a movable plate in sliding contact with the inner side wall of the side mold plate frame is arranged in the side mold plate frame. The concrete test block is naturally clamped on the clamping piece of the tensile testing machine by utilizing the characteristic that the two ends of the concrete test block are thick, an additional clamp is not needed to clamp the concrete, the concrete tensile test becomes simpler, meanwhile, the clamp is not needed to clamp the concrete test block, the force generated by the clamp on the concrete test block can be reduced as much as possible, and the test efficiency is improved. Therefore, the tensile limit of the concrete test block can be measured more accurately.

Description

Technical Field

[0001] This utility model belongs to the technical field of asphalt concrete tensile test block preparation, and particularly relates to a concrete test block mold for asphalt concrete tensile testing. Background Technology

[0002] In water conservancy projects, asphalt concrete is an important seepage-proofing material, widely used in asphalt concrete core wall dams, asphalt concrete face dams, cast-in-place asphalt concrete, and other structures such as canal seepage control. To ensure the quality and performance of asphalt concrete, its tensile properties must be rigorously tested. Traditional asphalt concrete tensile tests typically use standard-sized square concrete blocks, which are fixed to a tensile testing machine using adhesive joints or clamps to apply loads.

[0003] To ensure that the clamps do not detach from the concrete during tensile testing, the clamps must exert a strong clamping force on the concrete. This clamping force leads to stress concentration in the concrete around the clamps, affecting the accuracy of the tensile test and causing the measured tensile limit to not fully reflect the true performance of the concrete specimen. In addition, the installation and adjustment of the clamps are relatively complex and require a certain amount of time and effort, which reduces the efficiency of the test to some extent. Furthermore, existing molds often use methods such as tapping the side wall of the mold or inverting the mold and tapping the bottom to demold, which is quite cumbersome. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a concrete specimen mold for tensile testing of asphalt concrete.

[0005] To achieve the above objectives, the utility model employs the following technical solution: a concrete specimen mold for tensile testing of asphalt concrete, comprising a side template frame, a bottom template at the bottom of the side template frame, the side template frame comprising a straight mold part and a curved mold part integrally connected to both ends of the straight mold part, the straight mold part being two parallel and spaced straight plates on the bottom template, the curved mold part being an arc frame, the inner diameter of the curved mold part being larger than the inner width of the straight mold part, the side template frame having a movable plate inside that slides in contact with the inner sidewall of the side template frame, and a vertical demolding opening penetrating the bottom template at the center of the bottom template.

[0006] In the above technical solution, by changing the mold for making square concrete test blocks to a mold that can make square concrete test blocks that are thick at both ends and straight in the middle, the concrete test blocks made by this mold can naturally fit into the clamps of the tensile testing machine during concrete tensile testing due to the thicker ends of the concrete test blocks. No additional clamps are needed to hold the concrete itself, making the concrete tensile test simpler. At the same time, since no clamps are needed to hold the concrete test blocks, the force generated by the clamps on the concrete test blocks can be minimized, thereby measuring the tensile limit of the concrete test blocks more accurately. During demolding, a protrusion is placed at the demolding opening, and then the mold is pressed down to lift the movable plate and complete the demolding.

[0007] Optionally, the upper surface of the movable plate and the inner wall of the side template frame are both made into polished surfaces. The polished inner wall makes it easier to demold the concrete test blocks later.

[0008] Optionally, it also includes a demolding table adapted to the demolding opening, the demolding table including a base plate, the top of the base plate having an inner push block, the height of the inner push block being greater than the thickness of the bottom template, and the inner push block being able to pass through the demolding opening.

[0009] In the above technical solution, after the concrete test block has set, the mold is placed on the demolding table, the inner push block is aligned with the demolding opening, and the mold is pressed down so that the inner push block passes through the demolding opening and creates an upward pushing force on the internal movable plate, thereby achieving demolding.

[0010] Optionally, two demolding pressure frames are symmetrically arranged on the outer side of the side template frame. The edges of the demolding pressure frames are rounded. When demolding, holding the demolding pressure frames and pressing them down makes demolding easier.

[0011] Optionally, side extrusion openings are provided on both sides of the straight mold section, the height of the side extrusion openings is less than the thickness of the movable plate, and demolding components adapted to the side extrusion openings and demolding openings are provided on both sides of the straight mold section.

[0012] The demolding assembly includes mounting plates disposed on both sides of the straight mold section and located around the demolding opening. A bidirectional large-pitch screw is rotatably disposed between the two mounting plates. A wedge plate that can be inserted into the side extrusion port is placed on each of the two mounting plates. A connecting block that is threadedly connected to the bidirectional large-pitch screw is provided at the bottom of the wedge plate. A wrench lever is provided on the surface of the bidirectional large-pitch screw on the side opposite to the two wedge plates.

[0013] In the above technical solution, during demolding, the wrench lever is rotated from one side to the other, thereby driving the bidirectional large-pitch screw to rotate, which in turn drives the two wedge plates to move in the same direction. As the wedge plates move into the mold, they push the movable plate inside the mold to move up, thereby pushing out the concrete test block inside the mold.

[0014] Optionally, the pitch of the bidirectional large-pitch screw is between 3 and 8 centimeters. Such a large pitch design allows the bidirectional large-pitch screw to have a larger travel of the two wedges within a limited range of rotation, thereby allowing the movable plate to be lifted higher.

[0015] Optionally, the slope of the wedge plate is between 25° and 50°. This slope range ensures that the wedge plate can effectively push the movable plate up when it moves, without causing structural instability or damage due to excessive angle. At the same time, the appropriate slope design ensures the smooth demolding process and helps to protect the structural integrity of the mold and concrete test block.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. By changing the mold for making square concrete test blocks to a mold that can make square concrete test blocks that are thick at both ends and straight in the middle, the concrete test blocks made by this mold naturally fit into the clamping parts of the tensile testing machine during concrete tensile testing, taking advantage of the thicker ends of the concrete test blocks. No additional clamps are needed to hold the concrete itself, making the concrete tensile test simpler. Furthermore, since no clamps are needed to hold the concrete test blocks, the force exerted by the clamps on the concrete test blocks is minimized, resulting in a more accurate measurement of the tensile strength of the concrete test blocks. During demolding, a protrusion is placed at the demolding opening, and then the mold is pressed down to lift the movable part. 1. The mold plate completes the demolding process; 2. The polished inner wall makes it easier to demold the concrete test blocks later; 3. After the concrete test blocks have set, place the mold on the demolding table, align the inner push block with the demolding opening, and press the mold down so that the inner push block passes through the demolding opening and creates an upward pushing force on the internal movable plate, thus quickly achieving demolding; 4. During demolding, rotate the wrench from one side to the other, thereby driving the bidirectional large-pitch screw to rotate, which will drive the two wedge plates to move in the same direction. As the wedge plates move into the mold, they will push the movable plate inside the mold to move up, thereby pushing out the concrete test block inside the mold; 5. The large pitch design allows the bidirectional large-pitch screw to have a larger travel of the two wedge plates within a limited rotation range, thus allowing the movable plate to be lifted higher. Attached Figure Description

[0017] Figure 1 This is a side-view three-dimensional diagram showing the cooperation effect between the mold and the demolding table in Embodiment 1 of this utility model;

[0018] Figure 2 This is a three-dimensional cross-sectional view of the cooperation effect between the mold and the demolding table in Embodiment 1 of this utility model;

[0019] Figure 3 This is a top view of the mold in Embodiment 1 of this utility model;

[0020] Figure 4This is a three-dimensional side-view view of the mold in Embodiment 1 of this utility model;

[0021] Figure 5 This is a three-dimensional side-view view of the mold in Embodiment 2 of this utility model;

[0022] Figure 6 This is a top-view three-dimensional diagram showing the side fit effect of the mold and demolding assembly in Embodiment 2 of this utility model;

[0023] Figure 7 This is a bottom-view three-dimensional view of the side fit effect of the mold and demolding component in Embodiment 2 of this utility model;

[0024] Figure 8 This is a three-dimensional cross-sectional view of the cooperation effect between the mold and the demolding component in Embodiment 2 of this utility model;

[0025] Figure 9 This is a three-dimensional top view of the demolding component in Embodiment 2 of this utility model;

[0026] Figure 10 This is a three-dimensional side-view view of the demolding component in Embodiment 2 of this utility model;

[0027] Figure 11 This is a schematic diagram showing the tensile test effect of the demolded concrete specimen and the testing machine in an embodiment of this utility model.

[0028] In the diagram: 1. Side template frame; 11. Straight mold section; 111. Side extrusion port; 12. Curved mold section; 2. Bottom template; 21. Demolding port; 3. Movable plate; 4. Demolding pressure frame; 5. Demolding table; 51. Base plate; 52. Inner push block; 14. Side extrusion port; 6. Demolding assembly; 61. Mounting plate; 62. Bidirectional large pitch screw; 63. Wedge plate; 631. Connecting block; 64. Wrench lever; 7. Concrete test block; 8. Tensile testing machine; 9. Clamping device. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] In the description of this utility model, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Example 1:

[0032] like Figure 1-4 As shown, a concrete specimen block 7 mold for performing tensile tests on asphalt concrete includes a side template frame 1, a bottom template 2 at the bottom of the side template frame 1, the side template frame 1 includes a straight mold part 11 and a curved mold part 12 integrally connected to both ends of the straight mold part 11, the straight mold part 11 consists of two parallel and spaced straight plates on the bottom template 2, the curved mold part 12 is an arc frame, the inner diameter of the curved mold part 12 is larger than the inner width of the straight mold part 11, the side template frame 1 is provided with a movable plate 3 that slides in contact with the inner side wall of the side template frame 1, and the bottom template 2 has a vertical demolding opening 21 that penetrates the bottom template 2 at the center.

[0033] In the above technical solution, by changing the mold for making square concrete specimens 7 to a mold that can make square concrete specimens 7 with thick ends and a straight middle, the concrete specimens 7 made by this mold can naturally be clamped onto the clamping parts 9 of the tensile testing machine 8 when the concrete specimens 7 are made by this mold during the concrete tensile test, taking advantage of the thick ends of the concrete specimens 7. No additional clamps are needed to hold the concrete itself, making the concrete tensile test simpler. At the same time, since no clamps are needed to hold the concrete specimens 7, the force generated by the clamps on the concrete specimens 7 can be reduced as much as possible, thereby measuring the tensile limit of the concrete specimens 7 more accurately.

[0034] In this embodiment, the upper surface of the movable plate 3 and the inner wall of the side template frame 1 are both set as polished surfaces. The polished inner wall makes it easier to demold the concrete test block 7 later.

[0035] In this embodiment, a demolding table 5 adapted to the demolding opening 21 is also included. The demolding table 5 includes a base plate 51. An inner push block 52 is provided on the top of the base plate 51. The height of the inner push block 52 is greater than the thickness of the bottom template 2. The inner push block 52 can pass through the demolding opening 21.

[0036] In the above technical solution, after the concrete test block 7 is sintered, the mold is placed on the demolding table 5, the inner push block 52 is aligned with the demolding opening 21, and the mold is pressed down so that the inner push block 52 passes through the demolding opening 21 and exerts an upward pushing force on the internal movable plate 3, thereby achieving demolding.

[0037] In this embodiment, two demolding pressure frames 4 are symmetrically arranged on the outer side of the side template frame 1. The edges of the demolding pressure frames 4 are rounded. When demolding, the demolding pressure frames 4 are held and pressed down, which makes demolding more convenient.

[0038] The working principle of the above embodiment is as follows: First, the side template frame 1, the bottom template 2, and the movable plate 3 are assembled into a whole to form a closed space for concrete pouring. Specifically, the movable plate 3 is placed inside the side template frame 1 so that it rests on the bottom template 2. The straight mold part 11 consists of two parallel, spaced-apart straight plates on the bottom template 2, and the curved mold part 12 is an arc frame with an inner diameter larger than the inner width of the straight mold part 11. This design results in the final concrete test block 7 being a square block with thicker ends and a straight middle.

[0039] Subsequently, asphalt concrete is poured into the mold. After the concrete test block 7 has solidified, the entire mold is placed on the demolding table 5, ensuring that the inner push block 52 of the demolding table 5 is aligned with the demolding opening 21 at the center of the bottom template 2. By pressing the mold downwards, the inner push block 52 passes through the demolding opening 21 and provides an upward push to the internal movable plate 3. Since both the movable plate 3 and the inner wall of the side template frame 1 are polished, friction is reduced, allowing the movable plate 3 to move upwards smoothly, thereby achieving the demolding of the concrete test block 7.

[0040] After demolding, as Figure 11 As shown, the concrete specimen 7, with its thicker shape at both ends, naturally fits into the clamping piece 9 of the tensile testing machine 8, eliminating the need for additional clamps to hold the concrete specimen 7. This simplifies the concrete tensile testing process, reduces the force exerted by the clamps on the concrete specimen 7, and improves the accuracy of the measurement.

[0041] Example 2:

[0042] like Figure 5-10 As shown, a concrete specimen block 7 mold for performing tensile tests on asphalt concrete includes a side template frame 1, a bottom template 2 at the bottom of the side template frame 1, the side template frame 1 includes a straight mold part 11 and a curved mold part 12 integrally connected to both ends of the straight mold part 11, the straight mold part 11 consists of two parallel and spaced straight plates on the bottom template 2, the curved mold part 12 is an arc frame, the inner diameter of the curved mold part 12 is larger than the inner width of the straight mold part 11, the side template frame 1 is provided with a movable plate 3 that slides in contact with the inner side wall of the side template frame 1, and the bottom template 2 has a vertical demolding opening 21 that penetrates the bottom template 2 at the center.

[0043] In the above technical solution, by changing the mold for making square concrete specimens 7 to a mold that can make square concrete specimens 7 with thick ends and a straight middle, the concrete specimens 7 made by this mold can naturally be clamped onto the clamping parts 9 of the tensile testing machine 8 when the concrete specimens 7 are made by this mold during the concrete tensile test, taking advantage of the thick ends of the concrete specimens 7. No additional clamps are needed to hold the concrete itself, making the concrete tensile test simpler. At the same time, since no clamps are needed to hold the concrete specimens 7, the force generated by the clamps on the concrete specimens 7 can be reduced as much as possible, thereby measuring the tensile limit of the concrete specimens 7 more accurately.

[0044] In this embodiment, the upper surface of the movable plate 3 and the inner wall of the side template frame 1 are both set as polished surfaces. The polished inner wall makes it easier to demold the concrete test block 7 later.

[0045] In this embodiment, side extrusion openings 111 are provided on both sides of the straight mold part 11. The height of the side extrusion openings 111 is less than the thickness of the movable plate 3. Demolding components 6 adapted to the side extrusion openings 111 and demolding openings 21 are provided on both sides of the straight mold part 11.

[0046] The demolding assembly 6 includes mounting plates 61 disposed on both sides of the straight mold section 11 and located around the demolding opening 21. A bidirectional large-pitch screw 62 is rotatably disposed between the two mounting plates 61. A wedge plate 63 that can be inserted into the side extrusion opening 111 is placed on each of the two mounting plates 61. A connecting block 631 that is threadedly connected to the bidirectional large-pitch screw 62 is provided at the bottom of the wedge plate 63. A wrench lever 64 is provided on the surface of the bidirectional large-pitch screw 62 and on the side opposite to the two wedge plates 63.

[0047] During demolding, the wrench lever 64 is rotated from one side to the other, thereby driving the bidirectional large-pitch screw 62 to rotate, which in turn drives the two wedge plates 63 to move in the same direction. As the wedge plates 63 move into the mold, they push the movable plate 3 inside the mold to move upward, thereby pushing out the concrete test block 7 from the mold.

[0048] In this embodiment, the pitch of the bidirectional large-pitch screw 62 is between 3 and 8 centimeters. Such a large pitch design allows the bidirectional large-pitch screw 62 to have a larger travel range of the two wedge plates 63 within a limited rotation range, thereby allowing the movable plate 3 to be lifted higher.

[0049] In this embodiment, the slope of the wedge plate 63 is between 25° and 50°. This slope range ensures that the wedge plate 63 can effectively push the movable plate 3 upward when it moves, and will not cause structural instability or damage due to excessive angle. At the same time, the appropriate slope design ensures the smooth demolding process and helps to protect the structural integrity of the mold and concrete test block 7.

[0050] The working principle of the above embodiments is as follows:

[0051] Similar to Embodiment 1, a closed space is assembled from the side template frame 1 composed of the straight template part 11 and the curved template part 12, the bottom template 2, and the movable plate 3, into which concrete is poured and awaits the setting of the concrete.

[0052] When demolding is required, the demolding components 6 on both sides of the straight mold section 11 are used. Rotating the bidirectional large-pitch screw 62 causes the two wedge plates 63 to move in the same direction via the wrench lever 64. As the wedge plates 63 move into the mold, the wedges push the movable plate 3 upwards, thereby ejecting the concrete specimen 7 from the mold and achieving demolding. The bidirectional large-pitch screw 62 has a large pitch (3-8 cm), allowing for a greater travel distance of the two wedge plates 63 within a limited rotation range, thus raising the movable plate 3 higher and facilitating the removal of the concrete specimen 7.

[0053] After demolding, as Figure 11 As shown, similar to Example 1, the concrete specimen 7, with its thicker shape at both ends, naturally fits into the clamping piece 9 of the tensile testing machine 8, eliminating the need for additional clamps to hold the concrete specimen 7. This simplifies the concrete tensile testing process, reduces the force exerted by the clamps on the concrete specimen 7, and improves the accuracy of the measurement.

[0054] Finally, it should be noted that the two demolding methods shown in the above two embodiments are selected as follows:

[0055] When casting small and medium-sized concrete test blocks 7, the demolding method of Example 1 is adopted. Since the small and medium-sized concrete test blocks 7 are relatively light, the demolding table in Example 1 is adopted. After the concrete test blocks 7 solidify, they can be directly moved to the demolding table 5 through the mold for demolding.

[0056] When casting larger concrete test blocks 7, the demolding method in Example 2 is used. The larger concrete test blocks 7 are heavy and inconvenient to move. The demolding component 6 in Example 2 is used. After the concrete test blocks 7 have solidified, they do not need to be moved. Demolding can be achieved by simply turning the wrench lever 64.

[0057] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A concrete specimen mold for tensile testing of asphalt concrete, characterized in that, The device includes a side template frame, with a bottom template at the bottom of the side template frame. The side template frame includes a straight mold part and a curved mold part integrally connected to both ends of the straight mold part. The straight mold part consists of two parallel straight plates spaced apart on the bottom template. The curved mold part is an arc frame with an inner diameter greater than the inner width of the straight mold part. The side template frame has a movable plate inside that slides in contact with the inner sidewall of the side template frame. A demolding opening that penetrates vertically through the bottom template is provided at the center of the bottom template.

2. The concrete specimen mold for tensile testing of asphalt concrete according to claim 1, characterized in that: The upper surface of the movable plate and the inner sidewall of the side template frame are both polished surfaces.

3. A concrete specimen mold for tensile testing of asphalt concrete according to claim 1, characterized in that: It also includes a demolding table adapted to the demolding opening, the demolding table including a base plate, the top of the base plate having an inner push block, the height of the inner push block being greater than the thickness of the bottom template, and the inner push block being able to pass through the demolding opening.

4. A concrete specimen mold for tensile testing of asphalt concrete according to claim 1, characterized in that: Two demolding frames are symmetrically arranged on the outer side of the side template frame, and the edges of the demolding frames are rounded.

5. A concrete specimen mold for tensile testing of asphalt concrete according to claim 1, characterized in that: Both sides of the straight mold section are provided with side extrusion ports, the height of which is less than the thickness of the movable plate. The straight mold section is provided with demolding components that are adapted to the side extrusion ports and demolding ports. The demolding assembly includes mounting plates disposed on both sides of the straight mold section and located around the demolding opening. A bidirectional large-pitch screw is rotatably disposed between the two mounting plates. A wedge plate that can be inserted into the side extrusion port is placed on each of the two mounting plates. A connecting block that is threadedly connected to the bidirectional large-pitch screw is provided at the bottom of the wedge plate. A wrench lever is provided on the surface of the bidirectional large-pitch screw on the side opposite to the two wedge plates.

6. A concrete specimen mold for tensile testing of asphalt concrete according to claim 5, characterized in that: The pitch of the bidirectional large-pitch screw is between 3 and 8 centimeters.

7. A concrete specimen mold for tensile testing of asphalt concrete according to claim 5, characterized in that: The slope of the wedge plate is between 25° and 50°.

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