A modified asphalt ductility testing mechanism

Abstract

The utility model discloses a modified asphalt ductility test mechanism belongs to asphalt ductility test technical field, this device has included first mould, second mould, first bottom plate, second bottom plate and rotating plate. Among them, first mould and second mould are connected together mutually, and first bottom plate, second bottom plate and rotating plate are set up below first mould and second mould. And by first bottom plate, second bottom plate and rotating plate common formation one smooth plane, this smooth plane and first mould and second mould are surrounded and form one asphalt cavity. The utility model's advantage lies in, the smooth surface that first bottom plate, second bottom plate and rotating plate common formation can be with non - friction mode from the asphalt cavity of above -mentioned, thereby avoided in the process of abstracting, the shear force and the phenomenon of dragging that the friction of plane and modified asphalt sample caused in the process of abstracting to occur, thereby guaranteed the isotropy of modified asphalt sample, finally promoted the test precision.

Description

Technical Field

[0001] This utility model relates to the field of modified asphalt ductility testing technology, specifically to a modified asphalt ductility testing mechanism. Background Technology

[0002] Asphalt is one of the raw materials for road construction. Because asphalt pavements experience tensile or shear stress due to factors such as temperature changes and vehicle loads, its good ductility can reduce pavement cracking. Therefore, ductility testing is necessary during asphalt preparation.

[0003] The current mainstream asphalt ductility testing process involves placing a special mold on a base plate to create a casting space, injecting an asphalt sample, cooling it to solidify, and then transferring the entire sample to a ductility testing machine. The base plate is then removed to release the sample for tensile testing.

[0004] However, this testing method has a drawback: during the removal of the base plate, the unavoidable shear displacement generates strong friction and shear stress at the contact surface between the sample and the base plate. Modified asphalt, in particular, due to the incorporation of elastomers or thermoplastic polymers, has significantly higher adhesive strength than base asphalt, making it more prone to adhering to the base plate. This results in substantial shear and friction forces during the removal of the base plate, which can easily cause defects such as edge tearing and surface damage, thus affecting the ductility test results. Utility Model Content

[0005] To address the aforementioned technical shortcomings, the purpose of this utility model is to provide a modified asphalt ductility testing mechanism to solve the problem in the prior art where the shear force and friction generated by removing the base plate easily tear and damage the sample, thus affecting the ductility test results.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a modified asphalt ductility testing mechanism, comprising: a first mold and a second mold connected to each other, wherein a first base plate, a rotating plate and a second base plate are respectively provided on one side of the first mold and the second mold; wherein the first base plate and the rotating plate are rotatably connected, and the first base plate, the rotating plate and the second base plate form a smooth plane, which together with the first mold and the second mold forms an asphalt cavity.

[0007] Optionally, the first base plate is located on both sides of the second base plate, and the rotating plate is rotatably connected to the side of the first base plate near the second base plate, with the rotating plate abutting against the second base plate.

[0008] Optionally, the second base plate has protrusions on both sides near the rotating plate, and the rotating plate abuts against the protrusions. The first base plate, the rotating plate, and the second base plate form a smooth plane, which is located on the side near the first mold and the second mold.

[0009] Optionally, the second mold has protrusions on both sides, and the first mold has notches for use with the protrusions.

[0010] Optionally, the second base plate is also threadedly connected to a threaded portion, and an abutment portion is fixed to the side of the threaded portion facing the second mold, the abutment portion tightly abutting against the second mold.

[0011] Optionally, it also includes a movable seat and a fixed seat, which are disposed below the horizontal plane, and the movable seat and the fixed seat together form a slot that can accommodate the second base plate and the rotating plate.

[0012] Optionally, both the movable seat and the fixed seat are fixed with positioning columns, and the positioning columns are covered with sleeves. The sleeves are fixed to the first base plate, and the first mold is provided with positioning holes. The first mold is fitted over the sleeves through the positioning holes.

[0013] Optionally, the positioning post has a hexagonal outer cylindrical surface, the sleeve has a hexagonal inner cylindrical surface and an outer cylindrical surface, and the positioning port has a hexagonal inner opening surface.

[0014] Optionally, it also includes an asphalt ductility test chamber, wherein the fixed seat is fixed inside the asphalt ductility test chamber, and the movable seat is slidably connected inside the asphalt ductility test chamber.

[0015] Optionally, the asphalt ductility test chamber has a translation mechanism, which is fixed on the movable base.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention uses a first base plate, a second base plate, and a rotating plate to form a smooth plane. This plane can detach from the asphalt sample in a non-frictional manner, thereby avoiding the shearing force and dragging phenomenon caused by friction between the plane and the modified asphalt sample during the extraction process, and ultimately improving the testing accuracy.

[0018] Meanwhile, the second base plate of this utility model is also provided with an abutment part that is adjusted by screwing the threaded part. When the asphalt sample is added, the abutment part is tightly abutted against one side of the second mold, so that the second mold and the first mold are fixed, ensuring the stability of the asphalt cavity formation and avoiding the impact of its displacement on the modified asphalt sample in the cavity.

[0019] Furthermore, the positioning post of this utility model has a hexagonal outer cylindrical surface, the sleeve has a hexagonal inner cylindrical surface and an outer cylindrical surface, and the positioning port has a hexagonal inner opening surface. The positioning port is fitted over the sleeve, and the sleeve is fitted over the positioning post. The positioning post can directly position the first mold, ensuring the stability of the first mold during the formation and extension test of the asphalt cavity, and further avoiding the impact of its displacement on the modified asphalt sample in the cavity. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a modified asphalt ductility testing mechanism according to the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of the second base plate of the modified asphalt ductility testing mechanism of this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of the first mold and the second mold of the modified asphalt ductility testing mechanism of this utility model.

[0024] Figure 4 This is a schematic diagram illustrating the usage process of the modified asphalt ductility testing mechanism of this utility model.

[0025] Figure 5 This is a schematic diagram of the moving base and fixed base of a modified asphalt ductility testing mechanism according to this utility model.

[0026] Figure 6 This is a schematic diagram of the structure of the first base plate and the rotating plate of the modified asphalt ductility testing mechanism of this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. First mold; 11. Notch; 12. Positioning port; 2. Second mold; 21. Protrusion; 3. First base plate; 31. Sleeve; 4. Second base plate; 41. Boss; 42. Abutment part; 43. Threaded part; 5. Rotating plate; 6. Moving seat; 7. Fixed seat; 8. Positioning pin. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] As mentioned earlier, the current mainstream asphalt ductility testing process involves placing a specially designed mold on a base plate to create a casting space, injecting the asphalt sample, allowing it to cool and solidify, and then transferring the entire sample to a ductility testing machine. The base plate is then removed to release the sample for tensile testing. However, this testing method has a drawback: during the removal of the base plate, unavoidable shear displacement generates strong friction and shear stress at the sample-base plate contact surface. Modified asphalt, in particular, due to the incorporation of elastomers or thermoplastic polymers, has significantly higher adhesive strength than base asphalt, making it more prone to adhering to the base plate. This results in substantial shear and friction forces during the removal of the base plate, which can easily cause defects such as edge tearing and surface damage, thus affecting the ductility test results.

[0031] To address this issue, the present invention provides a ductility testing mechanism for modified asphalt, effectively solving the aforementioned problems. The present invention achieves this solution through the following means.

[0032] Example 1:

[0033] Please refer to the instruction manual appendix. Figures 1 to 6 As shown in the figure, this utility model provides a modified asphalt ductility testing mechanism. The mechanism includes a mold assembly consisting of a first mold 1 and a second mold 2, and a smooth plane consisting of a first base plate 3, a rotating plate 5, and a second base plate 4. The first mold 1 is a semi-circular ring, and two are symmetrically arranged, with a notch 11 on their adjacent surfaces. Two second molds 2 are also provided, with protrusions 21 on both sides of each second mold 2. The protrusions 21 are inserted into the notches 11, so that the first mold 1 and the second mold 2 together form a closed mold assembly.

[0034] like Figure 2As shown, in this embodiment, there are two first base plates 3, and a rotating plate 5 is rotatably connected to the side of the first base plate 3 away from the sleeve 31. A second base plate 4 is located on the side where the two rotating plates 5 are close to each other. The second base plate 4 has two bosses 41, which are located on the side of the second base plate 4 close to the rotating plates 5 and are placed on the bottom of the rotating plates 5. The first base plate 3 and the second base plate 4 have the same thickness, and the rotating plate 5 and the bosses 41 have the same thickness, each being half the thickness of either the first base plate 3 or the second base plate 4. Therefore, when the first base plate 3, the second base plate 4, and the rotating plate 5 are assembled together, a smooth horizontal plane facing the mold assembly can be formed. This smooth horizontal plane, combined with the mold assembly, can form a sealed asphalt cavity for accommodating the modified asphalt sample.

[0035] like Figure 4 or Figure 5 As shown in the first embodiment, the modified asphalt ductility testing mechanism further includes a movable seat 6 and a fixed seat 7. Both the movable seat 6 and the fixed seat 7 are L-shaped structures facing each other, each comprising a vertical seat portion and a horizontal extension portion. The vertical seat portions of the movable seat 6 and the fixed seat 7 are of the same specifications, but the horizontal extension portion of the fixed seat 7 is larger than the horizontal extension portion of the movable seat 6. The movable seat 6 and the fixed seat 7 together form a slot capable of accommodating the second base plate 4 and the rotating plate 5, and this slot is U-shaped. Both the movable seat 6 and the fixed seat 7 are located inside the asphalt ductility testing chamber. The fixed seat 7 is fixed within the chamber, and the movable seat 6 is slidably connected inside the asphalt ductility testing chamber and fixed to a translation mechanism (e.g., a linear motor, a telescopic cylinder, or a lead screw).

[0036] Therefore, in the specific implementation of this embodiment, the operator first assembles the first mold 1 and the second mold 2 together by inserting the protrusion 21 into the notch 11. Then, the first base plate 3, the second base plate 4, and the rotating plate 5 are also assembled into a smooth horizontal plane in the aforementioned manner, and this plane is placed below the mold assembly to form an asphalt cavity for accommodating the modified asphalt sample. Subsequently, the modified asphalt sample is poured into the asphalt cavity, and after it cools to the specified state, the operator uses their hand to support the smooth horizontal plane (if there is concern that the first base plate 3, the second base plate 4, and the rotating plate 5 may fall due to gravity during the transfer process, the operator can use a clamp to hold them on the connected side), and places it on the movable seat 6 and the fixed seat 7. At this time, the first base plate 3 is placed on the vertical seat part of the fixed seat 7 or the movable seat 6, the rotating plate 5 is located at the edge of the seat part, and the second base plate 4 is located above the groove. Subsequently, the operator removes the second base plate 4 vertically from its assembled state and places it within the slot formed by the moving seat 6 and the fixed seat 7 (most of it is placed in the horizontal extension of the fixed seat 7, ensuring that the second base plate 4 will not fall off due to the separation of the slot when the moving seat 6 moves). The rotating plate 5 is then rotated 90° and fitted against the side wall of the slot. The second mold 2 is then removed horizontally. At this point, the two first molds 1 are separated, but they still contain gel-like or fluid-like modified asphalt samples. The translation mechanism is then driven to slide the moving seat 6, allowing for the ductility test of the modified asphalt sample inside.

[0037] The method of detaching the second base plate 4 from the asphalt cavity vertically in a non-frictional manner, compared to the traditional direct extraction method, has the advantage of significantly reducing shear and frictional forces during detachment. This is especially true for modified asphalt, which, due to the incorporation of elastomers or thermoplastic polymers, has significantly higher adhesion than base asphalt, making it easier to bond with the base plate. Therefore, in the ductility test of modified asphalt, the reduced shear and frictional forces effectively prevent the impact of defects such as edge tearing and surface damage on the ductility test results.

[0038] Example 2:

[0039] Based on the above embodiments, in order to further clarify and completely explain the technical solutions therein, this utility model also provides an embodiment two. For example... Figure 1 , Figures 3 to 6As shown in this second embodiment, each first base plate 3 is provided with a sleeve 31. The sleeve 31 is hexagonal (i.e., both the inner and outer cylindrical surfaces are hexagonal). The sleeve 31 is inserted into the positioning opening 12 of the first mold 1, so that the first base plate 3 and the first mold 1 are engaged together (this engagement has a certain frictional force, which makes the first base plate 3 rise with the first mold 1 instead of falling). At the same time, a hexagonal positioning post 8 is provided on both the movable seat 6 and the fixed seat 7. The positioning post 8 is engaged in the inner cylindrical surface of the sleeve 31, thereby connecting the first mold 1, the first base plate 3, the movable seat 6 or the fixed seat 7 together. Because of the hexagonal shape, the above connection will not rotate horizontally during the ductility test, compared with the traditional cylindrical insertion method, thus ensuring the stability of the ductility test.

[0040] Example 3:

[0041] Based on the above embodiments, in order to further clarify and completely explain the technical solutions therein, this utility model also provides Embodiment Three. For example... Figure 1 , Figures 2 to 4 As shown, in this third embodiment, the second base plate 4 is also threaded with a threaded portion 43. An abutment portion 42 is fixed to the side of the threaded portion 43 facing the second mold 2. The abutment portion 42, through adjustment of the threaded portion 43, can tightly abut against the second mold 2. This allows the abutment portion 42 to provide a lateral clamping force to the second mold 2. This clamping force tightly holds the protrusion 21 of the second mold 2 within the notch 11 of the first mold 1, keeping it relatively stationary. This prevents damage to the modified asphalt sample caused by the relative movement between the first mold 1 and the second mold 2 during the pouring or transfer of the modified asphalt sample.

[0042] Meanwhile, during use, the first base plate 3 is snapped together with the first mold 1 via the sleeve 31, and the second base plate 4 is tightly abutted against the second mold 2 via the abutment part 42 and the threaded part 43. This allows the first mold 1, the second mold 2, the first base plate 3, the second base plate 4, and the rotating plate 5 to be fixed together in the aforementioned manner, thus maintaining relative stillness. Therefore, even without using clamps to hold the connected sides, there will be no accidental detachment during transfer.

[0043] Therefore, compared with the prior art, the present invention and its embodiments have the following advantages, including but not limited to:

[0044] This invention uses a first base plate 3, a second base plate 4, and a rotating plate 5 to form a smooth plane. This plane can detach from the asphalt sample in a non-frictional manner, thereby avoiding the shearing force and dragging phenomenon caused by friction between the plane and the modified asphalt sample during the extraction process, and ultimately improving the testing accuracy.

[0045] Meanwhile, the second base plate 4 of this utility model is also provided with an abutment part 42 that is adjusted by screwing the threaded part 43. When the asphalt sample is added, the abutment part 42 is tightly abutted against one side of the second mold 2, so that the second mold 2 and the first mold 1 are fixed, ensuring the stability of the asphalt cavity formation and avoiding the impact of its displacement on the modified asphalt sample in the cavity.

[0046] Furthermore, the positioning post 8 of this utility model has a hexagonal outer cylindrical surface, the sleeve 31 has a hexagonal inner cylindrical surface and an outer cylindrical surface, and the positioning port 12 has a hexagonal inner opening surface. The positioning port 12 is fitted over the sleeve 31, and the sleeve 31 is fitted over the positioning post 8. The positioning post 8 can directly position the first mold 1, ensuring the stability of the first mold 1 during the formation and extension test of the asphalt cavity, and further avoiding the impact of its displacement on the modified asphalt sample in the cavity.

[0047] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A modified asphalt ductility testing mechanism, characterized in that, include: The first mold (1) and the second mold (2) are connected to each other. The first mold (1) and the second mold (2) are respectively provided with a first base plate (3), a rotating plate (5) and a second base plate (4) on one side. The first base plate (3) and the rotating plate (5) are rotatably connected. The first base plate (3), the rotating plate (5) and the second base plate (4) form a smooth plane. This plane, together with the first mold (1) and the second mold (2), forms an asphalt cavity.

2. The modified asphalt ductility testing mechanism as described in claim 1, characterized in that, The first base plate (3) is located on both sides of the second base plate (4), and the rotating plate (5) is rotatably connected to the side of the first base plate (3) near the second base plate (4), and the rotating plate (5) abuts against the second base plate (4).

3. The modified asphalt ductility testing mechanism as described in claim 2, characterized in that, The second base plate (4) has protrusions (41) on both sides near the rotating plate (5), and the rotating plate (5) abuts against the protrusions (41). The first base plate (3), the rotating plate (5) and the second base plate (4) form a smooth plane, which is located on the side near the first mold (1) and the second mold (2).

4. The modified asphalt ductility testing mechanism as described in claim 1, characterized in that, The second mold (2) has protrusions (21) on both sides, and the first mold (1) has a notch (11) for use with the protrusions (21).

5. The modified asphalt ductility testing mechanism as described in claim 1, characterized in that, The second base plate (4) is also threaded with a threaded part (43), and the threaded part (43) is fixed with an abutment part (42) on the side facing the second mold (2), and the abutment part (42) abuts tightly against the second mold (2).

6. The modified asphalt ductility testing mechanism as described in claim 1, characterized in that, It also includes a movable seat (6) and a fixed seat (7), which are disposed below the plane. The movable seat (6) and the fixed seat (7) together form a slot that can accommodate the second base plate (4) and the rotating plate (5).

7. The modified asphalt ductility testing mechanism as described in claim 6, characterized in that, Positioning pins (8) are fixed on both the movable seat (6) and the fixed seat (7). A sleeve (31) is provided on the outer sleeve of the positioning pin (8). The sleeve (31) is fixed on the first base plate (3). A positioning port (12) is provided on the first mold (1). The first mold (1) is fitted on the sleeve (31) through the positioning port (12).

8. The modified asphalt ductility testing mechanism as described in claim 7, characterized in that, The positioning post (8) has a hexagonal outer cylindrical surface, the sleeve (31) has a hexagonal inner cylindrical surface and an outer cylindrical surface, and the positioning port (12) has a hexagonal inner opening surface.

9. The modified asphalt ductility testing mechanism as described in claim 6, characterized in that, It also includes an asphalt ductility test chamber, wherein the fixed seat (7) is fixed inside the asphalt ductility test chamber, and the movable seat (6) is slidably connected inside the asphalt ductility test chamber.

10. The modified asphalt ductility testing mechanism as described in claim 9, characterized in that, The asphalt ductility test chamber has a translation mechanism, which is fixed on the movable base (6).

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