A testing device for FRP reinforcement anchoring in seawater sand geopolymer concrete
By adding a reaction frame support in the test chamber of the loading reaction frame, the problem of cone formation in concrete specimens during FRP reinforcement anchorage performance testing was solved, achieving higher experimental accuracy and device applicability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHEN ZHEN SHI JIN ZHONG JI TUAN GU FEN YOU XIAN GONG SI
- Filing Date
- 2025-01-17
- Publication Date
- 2026-05-26
AI Technical Summary
When testing the anchorage performance of FRP bars, existing tensile testing machines tend to cause concrete specimens to form cones during tensile loading, affecting the accuracy of the experiment, especially for small-diameter steel bars, where there is a lack of effective support structures.
A reaction frame support is added inside the test chamber of the loading reaction frame. The diameter of the FRP reinforcement is adapted through the adapter hole to increase the contact area with the concrete specimen and prevent cone formation.
It effectively prevents the concrete specimens from forming cones during tensile tests, improving the accuracy of the experiment. Furthermore, the detachable reaction frame support adapts to FRP bars of different diameters, enhancing the applicability of the device.
Smart Images
Figure CN224286491U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of testing equipment, and in particular relates to a testing device for FRP reinforcement anchored seawater sand geopolymer concrete. Background Technology
[0002] Fiber-reinforced polymer (FRP) has become the best alternative to traditional steel bars, primarily due to its exceptional corrosion resistance and strong mechanical properties. Compared to traditional reinforced concrete structures, FRP structures offer superior durability by eliminating the risk of steel corrosion. Generally, to test the anchorage performance of steel bars or FRP reinforcement, a tensile testing machine is typically used for pull-out testing. In existing tensile testing machines, a concrete test block and the reinforcing bar form a test specimen on the testing frame. One end of the reinforcing bar extends outside the frame, and tension is applied via external equipment. Linear displacement sensors (LVDTs) are used to monitor the relative displacement of the free end and the outer end during tensile loading, confirming the tensile force the specimen can withstand. In this structure, to facilitate the extension of reinforcing bars of different sizes for different test specimens, the through-hole is generally relatively large. When using test specimens with smaller reinforcing bar diameters, the area where the test block connects to the reinforcing bar (the part opposite the through-hole) is unsupported. During tensile testing, this area is particularly prone to deformation, easily forming a concrete cone during the pull-out test, affecting the accuracy of the experiment. Utility Model Content
[0003] The purpose of this invention is to provide a testing device for FRP reinforcement anchored seawater sand geopolymer concrete, which adds a suitable reaction frame support to prevent the formation of cones on the surface of the concrete specimen during the pull-out test.
[0004] Based on this, the present invention provides a testing device for FRP reinforcement anchored in seawater and marine sand polymer concrete, including a loading reaction frame and a reaction frame support. The loading reaction frame has a testing cavity, and the testing cavity has a placement position for placing the FRP reinforcement anchor. The placement position has a through hole penetrating the testing cavity. The reaction frame support is located between the placement position and the FRP reinforcement anchor, and is used to abut against the surface of the concrete specimen of the FRP reinforcement anchor. The reaction frame support also has an adapter hole opposite to the through hole. The adapter hole is adapted to the size of the FRP reinforcement in the FRP reinforcement anchor and allows it to pass through.
[0005] As described above, in a test device for anchoring FRP bars in seawater and marine sand polymer concrete, the reaction frame support is detachably installed at the placement position.
[0006] As described above, the FRP reinforcement anchoring seawater sand geopolymer concrete testing device includes a loading reaction frame comprising a frame body and a base plate disposed on the lower side of the frame body. The frame body and the base plate enclose the testing cavity. The placement position is disposed on the base plate, and the placement position is a recessed position that is recessed downward from the inner side of the base plate. The reaction frame support is embedded and installed into the recessed position.
[0007] In the FRP reinforcement anchoring seawater sand geopolymer concrete test device described above, when the reaction frame support is installed in the recess, the inner surface of the reaction frame support is flush with the inner surface of the base plate.
[0008] As described above, in the FRP reinforcement anchoring seawater sand geopolymer concrete testing device, the recess is adapted to the outer periphery of the reaction frame support.
[0009] As described above, in the FRP reinforcement anchoring seawater sand geopolymer concrete testing device, the diameter of the through hole in the recess is larger than the adapter hole of the reaction frame support.
[0010] The FRP reinforcement anchorage seawater sand geopolymer concrete testing device described above has a reaction frame support thickness of 25mm-35mm.
[0011] As described above, an FRP bar anchored seawater sand geopolymer concrete testing device is provided, wherein the concrete specimen is formed on the FRP bar, and the FRP bar penetrates the concrete specimen to form an extended test tensile end and a free end. The free end is located inside the test cavity, and the test tensile end extends out of the test cavity through an adapter hole and a through hole.
[0012] The above-described FRP bar anchoring seawater sand geopolymer concrete test device, wherein the concrete specimen is made of seawater sand geopolymer concrete.
[0013] Implementing the embodiments of this utility model has the following beneficial effects:
[0014] 1. This utility model provides a testing device for FRP bar anchored in seawater and marine sand polymer concrete. For FRP bar anchors, a reaction frame support is added at the position where the FRP bar anchor is placed in the test chamber of the loading reaction frame. The adapter hole on the reaction frame support is adapted to the diameter of the FRP bar in the FRP bar anchor. This allows the reaction frame support to allow the FRP bar to pass through and also to make more effective contact with the concrete specimen, increasing the surface contact area and thus effectively preventing the formation of a cone on the surface of the concrete specimen during the pull-out test.
[0015] 2. The FRP bar anchorage performance testing device of this utility model can be adapted to FRP bars of different diameters by replacing the reaction frame support with different specifications. Different specifications of reaction frame support have different matching holes, which can improve the adaptability and make it suitable for pull-out tests of FRP bars of different diameters. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the FRP rebar anchorage performance testing device of this utility model;
[0018] Figure 2 This is a schematic diagram of the internal structure of the FRP (Fiberglass Reinforced Plastic) anchorage performance testing device.
[0019] Figure 3 A schematic diagram of a reaction frame;
[0020] Figure 4 This is a schematic diagram of the reaction frame support;
[0021] Figure 5 A schematic diagram of another specification of reaction frame support;
[0022] Figure 6 This is a half-section view of the FRP bar anchorage. Detailed Implementation
[0023] 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.
[0024] like Figures 1 to 6 As shown, this utility model embodiment provides a testing device for FRP reinforcement anchored in seawater and sea sand geopolymer concrete, including a loading reaction frame 1 and a reaction frame support 2. The loading reaction frame 1 has a testing cavity 101, and the testing cavity 101 is provided with a placement position for placing the FRP reinforcement anchor 9. The placement position is provided with a through hole penetrating the testing cavity 101. Similar to traditional testing equipment, a pull-out test is performed by applying tensile force to the FRP reinforcement of the FRP reinforcement anchor 9 and detecting the displacement at both ends of the FRP reinforcement.
[0025] In this embodiment of the utility model, the reaction frame support 2 is located between the placement position and the FRP bar anchor 9, and is used to abut against the surface of the concrete specimen 91 of the FRP bar anchor 9. The reaction frame support 2 also has an adapter hole 201 opposite to the through hole. The adapter hole 201 is adapted to the size of the FRP bar 92 of the FRP bar anchor 9 and allows it to pass through. Specifically, by adding a reaction frame support 2 at the position where the FRP bar anchor 9 is placed within the test cavity 101 of the loading reaction frame 1, and by using the adapter hole 201 on the reaction frame support 2 to adapt to the diameter of the FRP bar 92 of the FRP bar anchor 9, the reaction frame support 2 not only allows the FRP bar 92 to pass through, but also provides more effective contact with the concrete specimen 91, increasing the surface abutment area and effectively preventing the formation of a cone on the surface of the concrete specimen 91 during the pull-out test.
[0026] Specifically, the FRP bar anchor 9 in this invention has the following structure: the concrete specimen 91 is formed on the FRP bar 92, and the FRP bar 92 penetrates the concrete specimen 91 to form an outwardly extending test tension end 921 and a free end 922. The free end 922 is located inside the test cavity 101, and the test tension end 921 extends out of the test cavity 101 through the adapter hole 201 and the through hole. Furthermore, a PVC pipe sleeve is pre-installed between the insertion end and the exit end of the FRP bar 92, which facilitates the installation and positioning of the FRP bar 92 during molding.
[0027] Furthermore, the concrete specimen 91 described in this scheme is made of seawater and sea sand geopolymer concrete. With the continuous development of the social economy, the upgrading and expansion of infrastructure will generate huge demands for building materials. Freshwater and river sand, as basic raw materials in the concrete production process, are becoming increasingly scarce due to the growing demands of urban development, making their shortage a pressing issue that needs to be addressed. In addition, the need for long-distance transportation of raw materials from inland areas for coastal infrastructure, marine engineering, or island and reef construction drives up construction costs. To address these challenges, some have proposed using seawater and sea sand as an alternative for concrete production, as it effectively utilizes locally available resources. Coastal areas have abundant sea sand resources with enormous application potential. Using seawater and sea sand to prepare concrete allows for local sourcing, avoids long-distance transportation of raw materials from inland areas, effectively solves the problems of freshwater scarcity and excessive river sand extraction, and mitigates the adverse effects of climate change on existing concrete structures.
[0028] In this embodiment of the utility model, the loading reaction frame 1 includes a frame body 11 and a base plate 12 disposed on the lower side of the frame body 11. The frame body 11 and the base plate 12 surround the test cavity 101, and the placement position is disposed on the base plate 12.
[0029] Furthermore, to improve applicability, the reaction frame support 2 is detachably installed on the placement position. This solution can be improved by replacing the reaction frame support with different specifications. Different specifications of reaction frame support have different diameter adapter holes, which can accommodate FRP bars of different diameters, thereby improving adaptability and making it suitable for pull-out tests of FRP bars of different diameters.
[0030] As one of the optional rather than limiting embodiments, the placement position of this solution can be the inner side of the base plate 12, the reaction frame support 2 can be placed directly on the base plate 12, and the FRP bar anchor 9 can be placed directly on the reaction frame support 2 and pass through the adapter hole.
[0031] In a more preferred embodiment, the placement position described in this solution is a recess 3 that is recessed downward from the inner side of the base plate 12, and the reaction frame support 2 is embedded and installed into the recess 3. This is more conducive to the stability of the reaction frame support 2 after installation, and it is less likely to displace during tensile tests.
[0032] In a further preferred embodiment, the recess 3 of this solution is adapted to the outer peripheral contour of the reaction frame support 2. Furthermore, when the reaction frame support 2 is installed in the recess 3, the inner surface of the reaction frame support 2 is flush with the inner surface of the base plate 12. This is equivalent to a fully embedded installation, and the matching contour further enhances the stability after installation. This solution also utilizes the fact that the reaction frame support 2 is flush with the inner surface of the base plate 12 after installation, allowing for the adaptation of larger concrete specimens 91, so that the size of the concrete specimen 91 is not limited by the size of the reaction frame support 2.
[0033] Of course, in this design, the diameter of the through hole on the recess 3 is larger than the adapter hole 201 of the reaction frame support 2, to facilitate the extension of the FRP rib 92.
[0034] In order to ensure that the reaction frame support 2 is not easily crushed or deformed during the tensile test, the thickness of the reaction frame support 2 is preferably 25mm-35mm.
[0035] This utility model provides a testing device for FRP bar anchored in seawater and marine sand polymer concrete. Specifically designed for FRP bar anchors, it adds a reaction frame support at the location where the FRP bar anchor is placed within the test chamber of the loading reaction frame. The reaction frame support has an adapter hole to accommodate the diameter of the FRP bar in the anchor, allowing the FRP bar to pass through while also ensuring more effective contact with the concrete specimen. This increases the surface area of contact, effectively preventing the formation of a cone on the surface of the concrete specimen during the pull-out test.
[0036] It should be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "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.
[0037] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.
Claims
1. A testing device for FRP reinforcement anchoring in seawater sand geopolymer concrete, characterized in that, The system includes a loading reaction frame (1) and a reaction frame support (2). The loading reaction frame (1) has a test cavity (101). The test cavity (101) has a placement position for placing an FRP bar anchor (9). The placement position has a through hole that penetrates the test cavity (101). The reaction frame support (2) is located between the placement position and the FRP bar anchor (9) and is used to abut against the surface of the concrete specimen (91) of the FRP bar anchor (9). The reaction frame support (2) also has an adapter hole (201) that is opposite to the through hole. The adapter hole (201) is adapted to the size of the FRP bar (92) of the FRP bar anchor (9) and allows it to pass through.
2. The testing device for FRP reinforcement anchored in seawater sand geopolymer concrete according to claim 1, characterized in that, The reaction frame support (2) can be detachably installed on the placement position.
3. The testing device for FRP reinforcement anchored in seawater sand geopolymer concrete according to claim 2, characterized in that, The loading reaction frame (1) includes a frame body (11) and a base plate (12) located on the lower side of the frame body (11). The frame body (11) and the base plate (12) form the test cavity (101). The placement position is located on the base plate (12), and the placement position is a recess (3) that is recessed downward from the inner side of the base plate (12). The reaction frame support (2) is embedded and installed in the recess (3).
4. The testing device for FRP reinforcement anchored in seawater sand geopolymer concrete according to claim 3, characterized in that, When the reaction frame support (2) is installed in the recess (3), the inner surface of the reaction frame support (2) is flush with the inner surface of the base plate (12).
5. The testing device for FRP reinforcement anchored in seawater sand geopolymer concrete according to claim 4, characterized in that, The recess (3) is adapted to the outer periphery of the reaction frame support (2).
6. The testing device for FRP reinforcement anchored in seawater sand geopolymer concrete according to claim 4, characterized in that, The diameter of the through hole on the recess (3) is larger than the adapter hole (201) of the reaction frame support (2).
7. The testing device for FRP reinforcement anchored in seawater sand geopolymer concrete according to claim 4, characterized in that, The thickness of the reaction frame support (2) is 25mm-35mm.
8. A testing device for FRP reinforcement anchored in seawater sand geopolymer concrete according to any one of claims 1-7, characterized in that, The concrete specimen (91) is formed on the FRP bar (92), and the FRP bar (92) penetrates the concrete specimen (91) to form an extended test tension end (921) and a free end (922). The free end (922) is located inside the test cavity (101), and the test tension end (921) extends out of the test cavity (101) through the adapter hole (201) and the through hole.