A novel fiber geopolymer formwork structure and fixing method for concrete columns

Abstract

The present invention provides a novel concrete column fiber geopolymer formwork structure and fixing method, which relates to the technical field of building structures. It comprises: a fiber geopolymer formwork, one side of the fiber geopolymer formwork is provided with a polyimide tenon structure, and the other side opposite is provided with a polyimide tenon-groove structure; the polyimide tenon structure is suitable for being connected with the polyimide tenon-groove structure of another fiber geopolymer formwork to form a tenon-and-mortise connection structure; a protective support plate connected to the fiber geopolymer formwork board surface is provided near the inner side of the polyimide tenon structure and the polyimide tenon-and-groove structure, and the two protective support plates are suitable for abutting against each other to form a protective baffle of the tenon-and-mortise connection structure. This solution is used to facilitate the construction and installation of building formwork.

Description

Technical Field

[0001] The invention relates to the technical field of building structures, and in particular to a novel concrete column fiber geopolymer formwork structure and a fixing method thereof. Background Art

[0002] Building formwork is a key tool in concrete structure construction. In concrete structure projects, formwork costs usually account for 20% to 30% of the total project cost, 30% to 40% of the labor, and about 50% of the construction period. The quality of the formwork directly affects the quality of concrete. Therefore, improving the technical level of formwork engineering is of great significance for reducing costs, saving labor, speeding up project progress, and ensuring project quality. In existing building formwork, the installation technology of formwork workers varies, resulting in formwork cracking and concrete waste during concrete pouring. When pouring some large columns, due to the need for steel formwork support, workers need to constantly support and dismantle formwork around the four sides, which is a cumbersome process. In addition, the existing formwork has poor fire retardant performance, and the mortise and tenon structure usually used at the joints of adjacent formworks is unstable in fire resistance and has poor durability, which cannot meet the requirements of long-term use. Summary of the invention

[0003] The invention discloses a novel concrete column fiber geopolymer formwork structure, aiming to solve the above-mentioned problems.

[0004] The present invention adopts the following scheme:

[0005] A novel fiber geopolymer formwork structure for concrete columns comprises: a fiber geopolymer formwork, one side of the fiber geopolymer formwork is provided with a polyimide tenon structure, and the other side opposite thereto is provided with a polyimide tenon-groove structure; the polyimide tenon structure is suitable for being connected in cooperation with a polyimide tenon-groove structure of another fiber geopolymer formwork to form a mortise and tenon connection structure; a protective support plate connected to a fiber geopolymer formwork board surface is respectively provided near the inner sides of the polyimide tenon structure and the polyimide tenon-groove structure, and the two protective support plates are suitable for abutting against each other to form a protective baffle of the mortise and tenon connection structure.

[0006] Furthermore, the formula of the fiber geopolymer template includes granite powder, slag, kaolin and polyvinyl alcohol fiber, wherein the volume proportion of the granite powder is 15% to 25%, the volume proportion of the slag is 43% to 53%, the volume proportion of the kaolin is 27% to 37%, and the volume proportion of the polyvinyl alcohol fiber is 0.5% to 1%.

[0007] Furthermore, the volume ratio of the granite powder: slag: metakaolin is 0.2:0.48:0.32, and the volume content of the polyvinyl alcohol fiber is 0.75%.

[0008] Furthermore, when the fiber geopolymer template is prepared by mixing, the water-to-binder ratio in the formula is 0.48, and the sand-to-binder ratio is 1.8.

[0009] Furthermore, the polyimide tongue and groove structure and the polyimide tenon structure are respectively fixed to the fiber geopolymer template by polyimide bolts.

[0010] Furthermore, the protective support plate is configured to be rectangular and perpendicular to the fiber geopolymer template.

[0011] Furthermore, a cavity area suitable for pouring concrete is formed between the protective baffle and the mortise and tenon connection structure.

[0012] Furthermore, the protective support plate is formed by pouring mortar.

[0013] Furthermore, the polyimide tenon structure is vertically arranged on the board surface of the fiber geopolymer template, and the polyimide tongue and groove structure is arranged on the side of the fiber geopolymer template.

[0014] The present invention also discloses a method for fixing a concrete column fiber geopolymer formwork structure, comprising any one of the novel concrete column fiber geopolymer formwork structures described above, comprising the following steps:

[0015] S1. Casting fiber geopolymer formwork according to the formula;

[0016] S2, installing the polyimide tongue-and-groove structure on the side of the fiber geopolymer formwork, and installing the polyimide tenon structure on the board surface of the fiber geopolymer formwork;

[0017] S3, casting a protective support plate on the surface of the fiber geopolymer template near the polyimide tongue and groove structure and the polyimide tenon structure;

[0018] S4, connecting the polyimide mortise and tenon structure of one fiber geopolymer template with the polyimide tenon structure of another fiber geopolymer template, and connecting a plurality of the fiber geopolymer templates to form a column with a casting cavity, and forming a cavity area between the protective baffles on adjacent sides of two adjacent fiber geopolymer templates and the mortise and tenon connection structure;

[0019] S5. Pour concrete into the casting cavity and the cavity area to form a concrete column.

[0020] Beneficial effects:

[0021] The novel fiber geopolymer formwork for concrete columns of the scheme of the present invention is easy to manufacture, can be processed and installed in the factory in advance and then transported to the site. It is easy to install on site, has low installation technical requirements for workers who support the wooden formwork, and can effectively prevent the waste of cracked concrete; the mortise and tenon connection structure made of polyimide material is more resistant to high temperatures, and has high strength, strong toughness and good wear resistance. At the same time, polyimide is a self-extinguishing polymer with an extremely low smoke emission rate. The residual carbon rate after high-temperature combustion is often above 50%. It is a good heat-resistant agent and flame retardant. After pouring, the geopolymer formwork can serve as a protective layer for the column without disassembly; a protective support plate is arranged on the board surface of the fiber geopolymer formwork, which can serve as a concrete pad and form a cavity area at the corner of the connection for filling concrete, thereby solving the problem of unstable fire resistance of the mortise and tenon connection structure at the connection between two adjacent fiber geopolymer formworks, and greatly improving the durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of a connection structure of a novel fiber geopolymer formwork for concrete columns according to an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of a connection point of a novel fiber geopolymer formwork for a concrete column according to an embodiment of the present invention;

[0024] Figure 3 It is a structural schematic diagram of a novel fiber geopolymer formwork for concrete columns with a polyimide tenon structure according to an embodiment of the present invention;

[0025] Figure 4 It is a structural schematic diagram of a novel concrete column fiber geopolymer formwork with a polyimide tongue and groove structure according to an embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of a polyimide tongue-and-groove structure of a novel fiber geopolymer formwork for concrete columns according to an embodiment of the present invention;

[0027] Figure 6 It is a schematic diagram of a polyimide tenon structure of a novel fiber geopolymer formwork for concrete columns according to an embodiment of the present invention;

[0028] Icons: 1—mortise and tenon joint structure; 2—fiber geopolymer formwork; 3—protective support plate; 4—polyimide tongue and groove structure; 5—polyimide tenon structure; 6—polyimide bolt; DETAILED DESCRIPTION

[0029] Example 1

[0030] Combination Figures 1 to 6As shown, this embodiment provides a novel concrete column fiber geopolymer formwork structure, comprising: a fiber geopolymer formwork 2, wherein one side of the fiber geopolymer formwork 2 is provided with a polyimide tenon structure 5, and the other opposite side is provided with a polyimide tenon groove structure 4; the polyimide tenon structure 5 is suitable for being connected with the polyimide tenon groove structure 4 of another fiber geopolymer formwork 2 to form a mortise and tenon connection structure 1; a protective support plate 3 connected to the board surface of the fiber geopolymer formwork 2 is respectively provided near the inner side of the polyimide tenon structure 5 and the polyimide tenon groove structure 4, and the two protective support plates 3 are suitable for abutting against each other to form a protective baffle of the mortise and tenon connection structure 1.

[0031] In this embodiment, the formula of the fiber geopolymer template 2 includes granite powder, slag, metakaolin and polyvinyl alcohol fiber, wherein the volume proportion of the granite powder is 15% to 25%, the volume proportion of the slag is 43% to 53%, the volume proportion of the metakaolin is 27% to 37%, and the volume proportion of the polyvinyl alcohol fiber is 0.5% to 1%. Preferably, the volume ratio of the granite powder: slag: metakaolin is 0.2:0.48:0.32, and the volume proportion of the polyvinyl alcohol fiber is 0.75%; when mixing and preparing the fiber geopolymer template, the water-binder ratio in the formula is 0.48, and the sand-binder ratio is 1.8.

[0032] The fiber geopolymer template 2 can be set in a rectangular shape, which is obtained by mixing the above-mentioned formula. Multiple fiber geopolymer templates 2 can be surrounded by a frame for pouring concrete columns, for example, they can be surrounded by a square, hexagonal column, etc. This embodiment is described by taking a concrete column surrounded by a rectangular shape as an example.

[0033] Combination Figures 1 to 6As shown, the shape and structure of the plurality of fiber geopolymer templates 2 are the same, so that batch production can be realized, and classification is not required during installation, which can improve installation efficiency. Specifically, each fiber geopolymer template 2 includes a polyimide tenon structure 5 arranged on one side thereof, and the polyimide tenon structure 5 can be vertically arranged on the edge of the board surface near the fiber geopolymer template 2, and the polyimide tenon structure 5 can be arranged as a T-shaped structure, and a protective support plate 3 is arranged on the inner side of the polyimide tenon structure 5, and the protective support plate 3 can be formed by mortar pouring; there is a certain gap between the protective support plate 3 and the polyimide tenon structure 5. The polyimide tongue-and-groove structure 4 is arranged on the other side opposite to the fiber geopolymer formwork 2, and the polyimide tongue-and-groove structure 4 is arranged parallel to the side of the fiber geopolymer formwork 2, and another protective support plate 3 parallel to the protective support plate 3 at the polyimide tenon structure 5 is arranged on the fiber geopolymer formwork 2 board surface close to the polyimide tongue-and-groove structure 4; during installation, the polyimide tenon structure 5 of one of the fiber geopolymer formworks 2 is plugged into the polyimide tongue-and-groove structure 4 of another fiber geopolymer formwork 2, and the two are perpendicular to each other, and the protective support plates 3 abut against each other to form a cavity area between the tenon-and-mortise connection structure 1, and the protective support plate 3 serves as a support for the two fiber geopolymer formworks 2 on the one hand, improving the stability of the two adjacent fiber geopolymer formworks 2, and on the other hand, it can form a protective baffle of the tenon-and-mortise connection structure 1, and the formed cavity area is used for pouring concrete to further play a fireproof support effect. The four fiber geopolymer formworks 2 are connected end to end to enclose a concrete column, and there is no need to disassemble after pouring concrete, which reduces the construction process. In one embodiment, the protection support plate 3 is configured to be rectangular and perpendicular to the fiber geopolymer formwork 2. Specifically, the protection support plate 3 is formed by mortar pouring to improve strength and fire resistance.

[0034] In one embodiment, the polyimide tenon structure 5 and the polyimide tongue-and-groove structure 4 may be fixed to the fiber geopolymer template 2 by polyimide bolts 6 .

[0035] In this embodiment, the decomposition temperature of the polyimide material is usually about 500°C, and the long-term use temperature range is -200°C-300°C. In addition, polyimide has the characteristics of high strength, high toughness and high wear resistance. The tensile strength of unfilled plastic is above 100Mpa, and polyimide is a self-extinguishing polymer with extremely low smoke rate. The residual carbon rate after high-temperature combustion is often above 50%, which is a good heat-resistant agent and flame retardant. At the same time, after pouring, the fiber geopolymer template 2 can serve as a protective layer for the column without removal. Assuming that the protective layer of the concrete column is 30mm, the thickness of the geopolymer board is 20mm, and the thickness of the rectangular casting plate protruding from the geopolymer board is 5mm, a 5mm steel bar binding error is reserved. The protruding rectangular casting plate can serve as a concrete pad and form a cavity area at the corner. Then fill the cavity area when pouring concrete on site, which solves the instability of the fire resistance of the mortise and tenon structure at the connection, and also solves the durability problem at the same time. The structure is simple in construction and easy to install, making up for the shortcomings and deficiencies of traditional concrete pouring formwork, and has broad application prospects in engineering applications.

[0036] Example 2

[0037] The present invention also discloses a method for fixing a concrete column fiber geopolymer formwork structure, comprising the following steps:

[0038] S1, pouring a fiber geopolymer formwork 2 according to the above disclosed formula;

[0039] S2, installing the polyimide tongue and groove structure 4 on the side of the fiber geopolymer template 2, and installing the polyimide tenon structure 5 on the board surface of the fiber geopolymer template 2;

[0040] S3, casting protective support plates 3 respectively at positions near the polyimide tongue and groove structure 4 and the polyimide tenon structure 5 on the board surface of the fiber geopolymer template 2;

[0041] S4, connecting the polyimide mortise and tenon structure 4 of one fiber geopolymer template 2 with the polyimide tenon structure 5 of another fiber geopolymer template 2, and connecting a plurality of fiber geopolymer templates 2 end to end to form a column with a casting cavity, and forming a cavity area between the protective baffles formed on adjacent sides of two adjacent fiber geopolymer templates 2 and the mortise and tenon connection structure 1;

[0042] S5. Pour concrete into the casting cavity and the cavity area to form a concrete column.

[0043] In this embodiment, the fiber geopolymer formwork 2 can be prefabricated in the factory. Workers only need to connect the mortise and tenon structure and then pour concrete. There is no need to remove the formwork after pouring, which greatly improves the construction efficiency and the concrete column formed by pouring has high strength.

[0044] Example 3

[0045] The performance of the fiber geopolymer template 2 obtained after adding different doping amounts of polyvinyl alcohol fibers was compared to obtain the optimal doping amount of polyvinyl alcohol fibers.

[0046] According to the "Standard for Test Methods for Physical and Mechanical Properties of Concrete" GB50081-2019, the standard for concrete compressive performance cube test blocks uses a 150x150x150mm test block, and the standard test piece for concrete flexural performance test should be a prism test piece with a side length of 150mmx150mmx600mm or 150mx150mmx550mm. If a 100x100x100mm test block is used, the measured compressive strength value is multiplied by the size conversion coefficient of 0.95. If a 100x100x400mm test block is used, the measured flexural strength is multiplied by the size conversion coefficient of 0.85. There are three compressive strength and flexural strength test blocks in each group. The polyvinyl alcohol fiber geopolymer template 2 used in the present invention is designed according to the volume dosage, and the proportions of each component are respectively (as shown in Table 1):

[0047] Table 1

[0048]

[0049] The compressive strength (Mpa) test results of the fiber geopolymer template 2 obtained with the above doping amount at different times (as shown in Table 2):

[0050] Table 2

[0051]

[0052] The test results of the flexural strength (Mpa) of the fiber geopolymer template 2 obtained with the above-mentioned doping amount at different times are as shown in Table 3:

[0053] Table 3

[0054]

[0055] It can be seen that when the length of the polyvinyl alcohol fiber is 6mm and the dosage is 0%, the compressive strength of the geopolymer at 28d is lower than that of the fiber dosage of 0.75% and 1%; the increase of polyvinyl alcohol fiber will increase the flexural strength. When the polyvinyl alcohol fiber dosage is 0.75% and the water-binder ratio is 0.48, both the compressive and flexural strengths reach the best.

[0056] It should be understood that the above are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

[0057] The above description of the drawings used in the implementation manner only illustrates certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

Claims

1. A novel fiber geopolymer formwork structure for concrete columns, characterized in that: include: A fiber geopolymer template, wherein one side of the fiber geopolymer template is provided with a polyimide tenon structure, and the other side opposite thereto is provided with a polyimide tongue-and-groove structure; the polyimide tenon structure is suitable for being matched and connected with the polyimide tongue-and-groove structure of another fiber geopolymer template to form a mortise and tenon connection structure; A protective support plate connected to the fiber geopolymer template surface is provided near the inner side of the polyimide tenon structure and the polyimide tenon groove structure, and the two protective support plates are suitable for abutting against each other to form a protective baffle of the mortise and tenon connection structure; the formula for preparing the fiber geopolymer template includes granite powder, slag, metakaolin and polyvinyl alcohol fiber, wherein the volume proportion of the granite powder is 15% to 25%, the volume proportion of the slag is 43% to 53%, the volume proportion of the metakaolin is 27% to 37%, and the volume proportion of the polyvinyl alcohol fiber is 0.5% to 1%; The protective support plate is configured in a rectangular shape and is perpendicular to the fiber geopolymer template; A cavity area suitable for pouring concrete is formed between the protective baffle and the mortise and tenon connection structure; the cavity area is used for pouring concrete to further play a fireproof support effect.

2. The novel concrete column fiber geopolymer formwork structure according to claim 1 is characterized in that: The volume ratio of the granite powder: slag: metakaolin is 0.2:0.48:0.32, and the volume content of the polyvinyl alcohol fiber is 0.75%.

3. The novel concrete column fiber geopolymer formwork structure according to claim 2 is characterized in that: When the fiber geopolymer template is mixed and prepared, the water-to-binder ratio is 0.48 and the sand-to-binder ratio is 1.

8.

4. The novel concrete column fiber geopolymer formwork structure according to claim 1 is characterized in that: The polyimide tongue and groove structure and the polyimide tenon structure are respectively fixed on the fiber geopolymer template by polyimide bolts.

5. The novel concrete column fiber geopolymer formwork structure according to claim 1 is characterized in that: The protective support plate is formed by pouring mortar.

6. The novel concrete column fiber geopolymer formwork structure according to claim 1 is characterized in that: The polyimide tenon structure is vertically arranged on the board surface of the fiber geopolymer template, and the polyimide tongue and groove structure is arranged on the side of the fiber geopolymer template.

7. A method for fixing a concrete column fiber geopolymer formwork structure, characterized in that: The method adopts the novel concrete column fiber geopolymer formwork structure according to any one of claims 1 to 6, and comprises the following steps: S1. pouring and forming a fiber geopolymer template according to the formula; S2, installing the polyimide tongue-and-groove structure on the side of the fiber geopolymer formwork, and installing the polyimide tenon structure on the board surface of the fiber geopolymer formwork; S3, casting protective support plates respectively at positions near the polyimide tongue and groove structure and the polyimide tenon structure on the board surface of the fiber geopolymer template; S4, connecting the polyimide mortise and tenon structure of one fiber geopolymer template with the polyimide tenon structure of another fiber geopolymer template, and connecting a plurality of the fiber geopolymer templates to form a column with a casting cavity, and forming a cavity area between the protective baffles on adjacent sides of two adjacent fiber geopolymer templates and the mortise and tenon connection structure; S5. Pour concrete into the casting cavity and the cavity area to form a concrete column.

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