Device for manufacturing new and old concrete composite test block formed by pouring self-compacting concrete bottom surface

Abstract

The utility model relates to a device for manufacturing a new and old concrete composite test block formed by pouring a self-compacting concrete bottom surface, and belongs to the technical field of civil engineering. Aiming at the problems in the prior art, the utility model provides a manufacturing device for a new and old concrete composite test block formed by pouring a self-compacting concrete bottom surface, which comprises a bottom plate and side plates arranged on the two sides of the bottom plate, baffles are arranged at the two ends of the two side plates, and two partition plates are arranged in the middle of the two side plates, so that a cavity between the two side plates is divided into three adjacent test block cavities; u-shaped limiting steel clamps are arranged at the two ends of the upper surfaces of the two side plates. The device has the advantages of being capable of truly simulating construction working conditions, accurately controlling placement of test blocks and formation of bonding interfaces and the like.

Description

Technical Field

[0001] This utility model relates to a device for making a composite test block of new and old concrete by casting a self-compacting concrete bottom surface, which belongs to the field of civil engineering technology. Background Technology

[0002] Self-compacting concrete (SCC) is a high-performance concrete that flows and compacts automatically without vibration. Due to its high fluidity and excellent self-compacting properties, SCC is widely used in the construction industry, especially in high-density reinforced concrete structures, complex geometric components, and construction scenarios where vibration is difficult. Using SCC can significantly improve construction efficiency and quality, reduce reliance on manual and mechanical vibration, and lower construction noise and worker workload.

[0003] In practical engineering applications, SCC (Solid Cemented Concrete) is often used in conjunction with conventional vibrated concrete (VC) to form a composite structure. This type of structure requires good bond strength between the newly poured SCC and the previously constructed conventional concrete layer to ensure the overall stability and durability of the structure. The bond strength between the new and old concrete is a crucial factor affecting the overall performance of the composite structure; poor bonding can lead to interface cracking, water seepage, and even structural failure. Therefore, accurately determining the bond strength between SCC and conventional concrete is of great significance for the design optimization and safety assessment of concrete structures.

[0004] Existing bond strength testing methods mainly employ top-casting or side-casting methods to prepare test blocks. However, these methods have some significant shortcomings in practical operation:

[0005] 1. Limitations of top-surface and side-surface casting: Due to the influence of gravity and the limitations of the casting direction, top-surface and side-surface casting methods may not accurately reflect the actual bottom-surface casting conditions during construction. These methods may lead to a different bond interface than actually occurring, easily overestimating bond strength, and thus causing discrepancies between test results and actual construction conditions.

[0006] 2. Challenges of Bottom-Surface Casting: Bottom-surface casting better simulates gravity flow conditions in actual construction, but achieving it in a laboratory environment presents many challenges. Problems such as uneven concrete flow, air bubble retention, and difficulty in controlling the process can easily arise during bottom-surface casting, all of which negatively impact bond strength. Currently, there is a lack of standardized equipment specifically designed to simulate bottom-surface casting conditions, making it difficult to obtain accurate and reliable bond strength test data.

[0007] 3. Lack of standardized testing equipment: To ensure the repeatability and reliability of experimental data, a standardized test block preparation device is needed that can simulate the bonding between new and old concrete under actual construction conditions. Existing test block preparation devices are often not designed to fully account for the complex conditions of construction sites, resulting in insufficient representativeness of the experimental data. Utility Model Content

[0008] The purpose of this invention is to address the problems existing in the prior art by providing a device for making a composite test block of new and old concrete that can be cast from a self-compacting concrete bottom surface.

[0009] The technical solution provided by this utility model to solve the above-mentioned technical problems is: a device for making a composite test block of new and old concrete by casting a self-compacting concrete bottom surface, including a base plate and side plates set on both sides of the base plate; baffles are provided at both ends of the two side plates and two partitions are provided in the middle, dividing the cavity between the two side plates into three adjacent test block cavities; U-shaped limiting steel clamps are provided at both ends of the upper surface of the two side plates.

[0010] A further technical solution is that the number of U-shaped limiting steel clips is four, evenly distributed at both ends of the upper surface of the two side plates.

[0011] A further technical solution is that the U-shaped limiting steel clamp is installed on the side plate by screws.

[0012] A further technical solution is that the screw is a hand-tightened Torx screw.

[0013] A further technical solution is that the side plate has a through hole in the middle, and a plug is provided on the through hole.

[0014] A further technical solution is that the lower end of the partition has a pointed bevel.

[0015] A further technical solution is that the partition is an extended movable partition.

[0016] A further technical solution is that both ends of the two side plates are provided with T-shaped fixing brackets, and the lower end of the T-shaped fixing brackets is connected to the base plate by bolts.

[0017] This utility model has the following beneficial effects:

[0018] 1. Realistic simulation of construction conditions: By combining bottom surface pouring technology with the use of a small lifting platform and U-shaped limiting steel clamps, the gravity and concrete flow conditions in actual construction are realistically simulated, avoiding overestimation of bond strength and providing more representative experimental data.

[0019] 2. Precise control of specimen placement and bonding interface formation: A small lifting platform ensures the height and level accuracy of the specimen placement, while U-shaped limiting steel clamps fix the specimen position to prevent the upward thrust during pouring from affecting it. The design of the extended partition optimizes the formation of the bonding interface and improves experimental accuracy.

[0020] 3. Multifunctionality: Different types of test blocks can be made through the reserved holes and plugs on the side plates of the mold, such as standard self-compacting concrete test blocks and reinforced concrete test blocks, to meet different experimental needs.

[0021] 4. High repeatability and reliability of the test: Standardized design and precision manufacturing ensure consistent test conditions for each test. The small lifting platform and U-shaped limiting steel clamp provide consistent height for the placement and fixation of the test block. The extended partition ensures consistent interface formation and improves the reliability of the data.

[0022] 5. Simple operation and high efficiency: The design is simple and easy to operate. The small lifting platform and U-shaped limit steel clamp make it convenient to place and adjust the test block. The hand-tightening of the Torx screws does not require the use of complicated tools, making the experiment more efficient.

[0023] 6. Stable structure and high durability: Made of high-strength steel and precision manufacturing process, the device has a stable structure and high durability, and can withstand mechanical stress during high-frequency use and experiments.

[0024] 7. Safety and environmental friendliness: The device is designed with operational safety in mind, all adjustment components are easy to operate, reducing operational risks; it also reduces reliance on chemical additives and mechanical vibration, resulting in good environmental performance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the inner cavity of the side plate of this utility model;

[0027] Figure 3 This is a three-dimensional view of the partition. Detailed Implementation

[0028] 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 some embodiments of the utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] like Figure 1 As shown, this utility model provides a device for fabricating composite test blocks of new and old concrete by casting a self-compacting concrete base. The main body of the device is made of high-strength steel and features a robust and durable three-unit mold frame structure. The frame design effectively resists the pressure and external forces generated during the casting process, ensuring structural stability. The interior of the mold is designed with three adjacent test block spaces for simultaneously fabricating two composite test blocks and one complete 150mm cube self-compacting concrete test block. Each test block position on the mold body is equipped with a precise positioning and fixing mechanism to ensure the consistency of the test block size and shape.

[0033] Specifically, it includes a base plate 1 and side plates 2 set on both sides of the base plate 1; both ends of the two side plates 2 are provided with baffles and two partitions 6 are provided in the middle, which divide the cavity between the two side plates 2 into three adjacent test block cavities; both ends of the upper surface of the two side plates 2 are provided with two U-shaped limiting steel clips 5.

[0034] like Figure 1 As shown, in this embodiment, the U-shaped limiting steel clamp 5 is installed on the side plate 2 by screws. To facilitate the disassembly and tightening of the U-shaped limiting steel clamp 5, a further technical solution is that the screws are hand-tightened Torx screws. The U-shaped limiting steel clamp 5 ensures that the test block remains horizontal when placed and resists the influence of upward thrust during the pouring process, ensuring height consistency and test block stability.

[0035] like Figure 1As shown, in this embodiment, the side plate has a through hole 3 in the middle, which can be used to install a plug according to experimental needs, or to embed reinforcing bars to make reinforced concrete test blocks. The plug is used to make standard self-compacting concrete test blocks, and the reserved through hole 3 can realize the bond strength test between the reinforcing bars and concrete.

[0036] In this embodiment, in order to make it easier for the partition to overcome the obstruction of stones and be inserted to the bottom, the preferred embodiment is that the lower end of the partition has a pointed bevel.

[0037] In this embodiment, the partition is an extended movable partition, that is, the height of the partition is greater than the height of the side plate 2.

[0038] like Figure 1 As shown, in this embodiment, both ends of the two side plates 2 are provided with T-shaped fixing brackets 4, and the lower end of the T-shaped fixing brackets 4 is connected to the base plate 1 by bolts.

[0039] The specific usage process of this embodiment is as follows:

[0040] Firstly, a small, movable lifting platform is installed on each of the left and right sides of the two side panels 2, at the location of the test block. The lifting platform is made of metal, providing good stability, and is equipped with a precision screw adjustment system. By rotating the screws, the height of the lifting platform can be controlled, allowing the test block to slowly rise or fall horizontally. The lifting platform is used when placing half of the test block; after the test block is secured, it can be removed, ensuring that the test block remains horizontal during placement, thus improving the convenience and accuracy of construction.

[0041] Preparation: Place the old concrete block on the left and right sides of the two side plates 2. First, place the small lifting platform in the test block position, and adjust the height of the test block by rotating the lifting platform screws to keep it rising horizontally until the upper surface of the test block contacts the U-shaped limiting steel clamp 5. Tighten the star-shaped screws to fix the test block, then lower the lifting platform, detach it from the lower surface of the test block, and remove it.

[0042] Bottom surface pouring: Remove the middle partition and pour self-compacting concrete from the bottom of the middle test block, allowing the concrete to flow from the bottom to both sides until it contacts the lower surface of the old concrete block.

[0043] Partition Insertion: When the new concrete reaches the lower surface of the old concrete block, immediately insert the partition into the two side plates 2 from the top. To ensure that the partition is inserted into the bottom plate 1, a horizontal groove at the same height as the side plates 2 is provided on the partition. When the horizontal groove is aligned with the mold surface, it indicates that the partition has been inserted to the bottom.

[0044] Continue pouring: After inserting the partition, continue pouring self-compacting concrete from the middle position until the mold is full, forming a complete 150mm cube self-compacting concrete test block.

[0045] Multifunctional operation (optional): If a bond strength test between the steel reinforcement and concrete is required, pre-insert the steel reinforcement through the through-hole 5 in side plate 2, and then proceed with the pouring as described above. A plug can be used to prepare standard test blocks.

[0046] Curing process: After pouring, wait for the concrete to cure, then remove the mold and take out the test block. The test block can be used for bond strength and other mechanical property tests.

[0047] This embodiment has the following characteristics:

[0048] 1. Simulate actual construction conditions:

[0049] Existing top and side pouring methods cannot accurately reflect the bond strength between new and old concrete under actual bottom pouring conditions, often overestimating the bond strength. The new device, by introducing bottom pouring technology combined with a small lifting platform and U-shaped limiting steel clamps, can more realistically simulate the flow and bonding process of concrete under gravity during actual construction. The lifting platform design ensures the stability and levelness of the half-block during placement, while the U-shaped limiting steel clamps ensure the stability of the block during pouring, thereby improving the realism of the experimental results and the accuracy of engineering applications.

[0050] 2. Improve the accuracy of bond strength testing:

[0051] Traditional methods often lead to overestimation of bond strength due to limitations in the formation of the bond interface caused by top and side pouring. The new device, however, uses bottom pouring to simulate gravity flow under actual construction conditions, ensuring that the concrete flows naturally into place. The use of extended movable baffles, particularly their horizontal grooves and pointed bevel structures, further optimizes interface formation during pouring, reducing the likelihood of air bubbles and other irregular interfaces. This design provides more accurate bond strength test results, contributing to improvements in engineering design and construction methods.

[0052] 3. Enhance the reproducibility of experiments:

[0053] The standardized specimen preparation device significantly improves the consistency of experimental conditions for each test. The combination of a small lifting platform and a U-shaped limiting steel clamp ensures the levelness and stability of the specimens, while the extended movable partition design allows for more precise control over the insertion depth and angle of the partition. These designs reduce the impact of human operation and environmental changes on experimental results, improving the reliability and repeatability of the data. This consistency is crucial for long-term experiments studying the bond properties of new and old concrete, providing stable data support for scientific research and engineering applications.

[0054] 4. Ease of operation and efficiency:

[0055] The new device simplifies experimental procedures through its user-friendly design. The addition of a small lifting platform makes specimen placement more convenient and precise, reducing operational steps and time. The use of U-shaped limiting steel clamps 5 not only ensures the stability of the specimens but also facilitates fixing and adjustment. The improved design of the extended movable partition makes insertion smoother, even when there are stones obstructing the self-compacting concrete pouring process, it can be easily inserted to the bottom. These design features make the entire experimental process more efficient and easy to implement in laboratory and real-world engineering environments.

[0056] 5. Multifunctionality:

[0057] The new device is designed for versatility, allowing for the flexible fabrication of different types of test blocks through through-holes on both sides of the mold and replaceable plugs. Whether producing standard self-compacting concrete test blocks or reinforced concrete test blocks using pre-embedded reinforcing bars, the device can meet diverse experimental needs. This versatility not only expands the device's application range but also provides effective solutions for various tests, including mechanical properties, bond strength, and rebar bond strength.

[0058] The above description is not intended to limit the present invention in any way. Although the present invention has been disclosed through the above embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A device for fabricating a composite test block of old and new concrete by casting a self-compacting concrete bottom surface, characterized in that, It includes a base plate and side plates on both sides of the base plate; both ends of the two side plates are equipped with baffles and two partitions in the middle, which divide the cavity between the two side plates into three adjacent test block cavities; both ends of the upper surface of the two side plates are equipped with U-shaped limiting steel clips.

2. The apparatus for fabricating a composite test block of new and old concrete by casting a self-compacting concrete bottom surface according to claim 1, characterized in that, The number of U-shaped limiting steel clips is four, which are evenly distributed at both ends of the upper surface of the two side plates.

3. The apparatus for fabricating a composite test block of old and new concrete by casting a self-compacting concrete bottom surface, as described in claim 1, is characterized in that... The U-shaped limiting steel clamp is installed on the side plate by screws.

4. The apparatus for fabricating a composite test block of new and old concrete by casting a self-compacting concrete bottom surface, as described in claim 3, is characterized in that... The screw is a hand-tightened Torx screw.

5. The apparatus for fabricating a composite test block of old and new concrete by casting a self-compacting concrete bottom surface according to claim 1, characterized in that, The side plate has a through hole in the middle, and a plug is provided on the through hole.

6. The apparatus for fabricating a composite test block of new and old concrete by casting a self-compacting concrete bottom surface according to claim 1, characterized in that, The lower end of the partition has a pointed bevel.

7. The apparatus for fabricating a composite test block of old and new concrete by casting a self-compacting concrete bottom surface according to claim 1, characterized in that, The partition is an extended movable partition.

8. The apparatus for fabricating a composite test block of new and old concrete by casting a self-compacting concrete bottom surface according to claim 1, characterized in that, Both ends of the two side plates are provided with T-shaped fixing brackets, and the lower end of the T-shaped fixing brackets is connected to the base plate by bolts.

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