Preparation Method of Carbon Fiber Mesh ICCP-SS Reinforced Steel Bar Sea Water and Sea Sand Concrete Composite Slab

Abstract

The present invention discloses a method for preparing a carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab, comprising: laying a cushion layer and placing a steel cage at the bottom of the composite slab formwork; pouring seawater and sea sand concrete into the composite slab formwork and curing it; removing the composite slab formwork and cushion layer to form a shear keyway on the seawater and sea sand concrete layer; connecting a carbon fiber grid to the side of the seawater and sea sand concrete layer where the shear keyway is located; after reinstalling the composite slab formwork, pouring a conductive mortar mixed with carbon fiber short filaments on the carbon fiber grid to form a conductive mortar protective layer; after removing the composite slab formwork again, connecting the carbon fiber grid and the steel cage with a power supply to protect the steel cage to obtain the composite slab. The composite ICCP-SS system and reinforced seawater and sea sand concrete effectively utilize the seawater and sea sand resources in coastal areas, prevent and delay the corrosion of steel bars, and improve or compensate for the structural bearing capacity lost due to steel bar corrosion.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated structure engineering, and in particular to a method for preparing a carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab. Background Art

[0002] Coastal areas are rich in seawater and sand resources. Using seawater and sand in concrete structures can effectively address the increasing depletion of river sand and freshwater resources, making full use of local resources. However, currently, reinforced concrete structures using seawater and sand suffer from severe corrosion, which reduces the mechanical properties and durability of seawater and sand concrete structures.

[0003] Impressed Current Cathodic Protection (ICCP) is a technology that uses auxiliary anode materials to apply cathodic protection current to the steel bars inside concrete structures, shifting the potential negatively to the corrosion-free zone, thereby protecting the steel bars. It is recognized as an effective control method for preventing and delaying steel corrosion. Structural Strengthening (SS) is a technology that uses structural reinforcement materials such as structural steel or fiber-reinforced polymer (FRP) to jointly bear stress and deformation with concrete structures, thereby improving or repairing the mechanical properties of the structure.

[0004] Among existing technologies, although ICCP technology can inhibit the corrosion of steel bars in concrete structures in coastal environments, it cannot restore the deterioration of structural mechanical properties caused by steel bar corrosion; although SS technology can improve or restore the structural bearing capacity, it cannot fundamentally solve the continuous corrosion of steel bars by the external environment and internal harmful media of concrete structures in coastal environments.

[0005] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab in response to the above-mentioned defects of the prior art, aiming to solve the problem of loss of structural bearing capacity due to corrosion of steel bars caused by seawater and sea sand in the prior art.

[0007] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0008] A carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite panel, comprising: an interconnected reinforced seawater and sea sand concrete composite panel core and an impressed current cathodic protection and structural reinforcement system;

[0009] The reinforced seawater and sea sand concrete composite slab core comprises:

[0010] Seawater and sea sand concrete layer;

[0011] A steel cage is embedded in the seawater and sea sand concrete layer;

[0012] A plurality of shear key slots are provided on the side of the seawater and sea sand concrete layer facing the impressed current cathodic protection and structural reinforcement system, and the steel cage is located at the bottom of the shear key slots;

[0013] The impressed current cathodic protection and structural reinforcement system includes:

[0014] A carbon fiber grid is provided on the seawater and sea sand concrete layer on the side where the shear key groove is located;

[0015] A conductive mortar protective layer is arranged on a side of the carbon fiber grid away from the seawater and sea sand concrete layer, passes through the carbon fiber grid, fills the shear key groove, and is connected to the steel cage.

[0016] The carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab, wherein the steel cage comprises:

[0017] Distributed steel bars are embedded in the seawater and sea sand concrete layer;

[0018] A plurality of truss steel bars are connected to the distribution steel bars.

[0019] The carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab, wherein the distribution steel bars include:

[0020] A plurality of longitudinal distribution steel bars are located at the bottom of the shear key groove;

[0021] A plurality of transverse distribution steel bars are connected to the longitudinal distribution steel bars.

[0022] The carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab, wherein the truss steel bars include:

[0023] Two bottom longitudinal steel bars are located between two adjacent longitudinal distribution steel bars and at the bottom of the shear key groove;

[0024] Top longitudinal steel bars, located outside the seawater and sea sand concrete layer;

[0025] A plurality of connecting steel bars have two ends respectively connected to the bottom longitudinal steel bar and the top longitudinal steel bar.

[0026] The carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab, wherein the carbon fiber grid adopts an orthogonal grid and the pore size of the carbon fiber grid is 10mm-50mm; and / or

[0027] The depth of the shear keyway is 3mm-15mm, and the diameter or side length of the shear keyway is 10mm-100mm; and / or

[0028] The distance between two adjacent shear key grooves is 20mm-200mm.

[0029] The carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite board, wherein the conductive mortar protective layer includes: a cement mortar layer and carbon fiber short filaments dispersed in the cement mortar layer.

[0030] The carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab is connected to the seawater and sea sand concrete layer by an epoxy resin adhesive, and the bonding area of the epoxy resin adhesive does not exceed 10% of the area of the carbon fiber grid.

[0031] A method for preparing a carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab, comprising the following steps:

[0032] Provide a composite plate formwork, a cushion layer, seawater and sea sand concrete, a steel cage, a carbon fiber grid, and a conductive mortar mixed with carbon fiber short filaments; the cushion layer is provided with a plurality of protrusions;

[0033] The rubber cushion layer is laid on the bottom of the composite plate formwork, and the steel cage is placed; the protrusion is arranged away from the bottom of the composite plate formwork, and the protrusion is in contact with the steel cage;

[0034] pouring the seawater and sea sand concrete into the composite slab formwork and solidifying it to form a seawater and sea sand concrete layer;

[0035] removing the composite slab formwork and the cushion layer to form a shear keyway on the seawater and sea sand concrete layer;

[0036] Connecting a carbon fiber grid to the seawater and sea sand concrete layer on one side where the shear key groove is located;

[0037] After reinstalling the composite plate formwork, pouring conductive mortar mixed with carbon fiber short filaments on the carbon fiber grid, so that the conductive mortar mixed with carbon fiber short filaments passes through the carbon fiber grid, fills the shear key groove, and is connected to the steel cage to form a conductive mortar protective layer;

[0038] After the composite slab formwork is removed again, a power source is used to connect the carbon fiber grid and the steel cage to protect the steel cage, thereby obtaining a carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab.

[0039] The preparation method of the carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite board, wherein the protective treatment applies 10mA / m 2 of DC current.

[0040] The method for preparing the carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite board, wherein the conductive mortar mixed with carbon fiber short filaments is prepared by the following method:

[0041] Provide mortar;

[0042] adding water after stirring the mortar for the first time;

[0043] Continue stirring the mortar for a second time and then add carbon fiber short filaments and expansion agent;

[0044] After continuing to stir the mortar for a third time, a water reducer is added to make the flat plate expansion of the mortar greater than 250 mm, thereby obtaining a conductive mortar mixed with carbon fiber short filaments.

[0045] Beneficial effects: The ICCP-SS system and reinforced seawater and sea sand concrete are combined to effectively utilize the seawater and sea sand resources in coastal areas, prevent and delay the corrosion of steel bars, and improve or compensate for the loss of structural bearing capacity due to steel bar corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a partial cross-sectional view of the composite plate in the present invention.

[0047] Figure 2 It is a casting diagram of the composite slab core in the present invention.

[0048] Figure 3 This is a casting diagram of the impressed current cathodic protection and structural reinforcement system of the present invention.

[0049] Description of reference numerals:

[0050] 1. Longitudinal distribution steel bars; 2. Horizontal distribution steel bars; 3. Bottom longitudinal steel bars; 4. Seawater and sea sand concrete layer; 5. Conductive mortar protective layer; 6. Carbon fiber mesh; 7. Cushion layer; 8. Composite slab formwork; 9. Shear key slot; 10. Carbon fiber mesh pasting area. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the present invention more clear and distinct, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0052] Please also see Figure 1-Figure 3 The present invention provides some embodiments of a carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab.

[0053] Carbon fiber mesh is a widely used material in SS technology due to its advantages such as light weight, high strength, corrosion resistance, and fatigue resistance. Furthermore, carbon fiber has excellent electrical conductivity and stable chemical properties, making it suitable for use as an auxiliary anode in ICCP technology. Therefore, it is possible to develop carbon fiber mesh materials into a combined system with both ICCP and SS functions.

[0054] Seawater and sea sand concrete structures can fully utilize the seawater and sea sand resources in coastal areas. It is feasible to develop carbon fiber mesh into a composite system (ICCP-SS) that provides impressed current cathodic protection and structural reinforcement to prevent and delay steel corrosion, thereby improving and restoring the structural bearing capacity lost due to steel corrosion. Providing a prefabricated reinforced seawater and sea sand composite slab with impressed current cathodic protection and structural reinforcement is a pressing technical problem in this field.

[0055] like Figure 1-Figure 3 As shown, the carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab of the present invention comprises:

[0056] Interconnected reinforced seawater and sea sand concrete composite slab core with impressed current cathodic protection and structural reinforcement system;

[0057] The reinforced seawater and sea sand concrete composite slab core comprises:

[0058] Seawater and sea sand concrete layer 4;

[0059] A steel cage is embedded in the seawater and sea sand concrete layer 4;

[0060] The seawater and sea sand concrete layer 4 is provided with a plurality of shear key slots 9 on the side facing the impressed current cathodic protection and structural reinforcement system, and the steel cage is located at the bottom of the shear key slots 9;

[0061] The impressed current cathodic protection and structural reinforcement system includes:

[0062] A carbon fiber grid 6 is provided on the seawater sand concrete layer 4 on the side where the shear key groove 9 is located;

[0063] The conductive mortar protective layer 5 is arranged on the side of the carbon fiber grid 6 away from the seawater sand concrete layer 4, passes through the carbon fiber grid 6, fills the shear key groove 9, and is connected to the steel cage.

[0064] It is worth noting that in the prior art, when using seawater and sea sand, the seawater is usually first desalinated and the sea sand is purified. Then, the desalinated seawater and purified sea sand are used to make concrete. In addition, rust inhibitors are added and the surface coating of the steel bars is applied to prevent chloride ion corrosion. In the present application, the seawater and sea sand concrete layer 4 refers to a concrete structure formed using undesalted seawater and / or unpurified sea sand as raw materials. It should be noted that the undesalted seawater and unpurified sea sand in the present application can be used directly as raw materials. For example, cement is added to the unpurified sea sand and then undesalted seawater is added to form seawater and sea sand concrete. Since the seawater and sea sand concrete layer 4 is made using undesalted seawater and / or unpurified sea sand, harmful media such as chlorides and sulfates exist inside the seawater and sea sand concrete layer 4. It should be noted that when preparing the carbon fiber mesh ICCP-SS reinforced seawater and sea sand concrete composite slab, this application requires a power supply to connect the carbon fiber mesh 6 and the steel cage, and to perform a protective treatment on the steel cage to remove harmful media, thereby actively intervening in corrosion of the steel cage within the seawater and sea sand concrete layer 4, which is rich in harmful media. This application utilizes the dual functions of structural reinforcement and cathodic protection of the impressed current cathodic protection and structural reinforcement system, and applies it to the core of the reinforced seawater and sea sand concrete composite slab. Even when the seawater and sea sand concrete layer is rich in harmful media or the external environment is harsh, the steel bars can be adequately protected.

[0065] The steel cage is a cage structure formed by tying together steel bars. The conductive mortar protective layer 5 is a conductive mortar protective layer. Specifically, a conductive medium (such as carbon fiber staples) can be added to the mortar to form the conductive mortar protective layer 5. The shear key slot 9 is a slot for casting the conductive mortar shear key, which is used to strengthen the integrity of the conductive mortar protective layer and the seawater sand concrete layer.

[0066] The conductive mortar protective layer 5 is not only connected to the carbon fiber grid 6, but also extends into the shear key groove 9 to connect with the steel cage. The conductive mortar protective layer 5 in the shear key groove 9 forms an electron transmission channel, ensuring that the Cl ions in the seawater and sea sand concrete layer 4 can be quickly transferred to the conductive medium in the conductive mortar protective layer 5 for oxidation to form Cl2.

[0067] By combining the ICCP-SS system with reinforced seawater and sea-sand concrete, the seawater and sea-sand resources in coastal areas are effectively utilized, the corrosion of steel bars is prevented and delayed, the structural bearing capacity lost due to steel bar corrosion is improved or compensated, and the durability and structural performance of the prefabricated composite slabs are ensured.

[0068] In a preferred implementation of the embodiment of the present invention, Figure 1-Figure 2 As shown, the steel cage includes:

[0069] Distributed steel bars are embedded in the seawater and sea sand concrete layer 4;

[0070] A plurality of truss steel bars are connected to the distribution steel bars.

[0071] Specifically, distributed reinforcement refers to distributed steel bars, while truss reinforcement refers to steel bars that are overlapped to form a truss. The steel cage is formed by tying these two types of steel together, resulting in high structural strength. Furthermore, the steel cage is in full contact with the seawater-sand concrete layer 4. When the impressed current cathodic protection and structural reinforcement system is connected to an external power source, the steel cage is connected to the power source, forming an electron transmission channel in the seawater-sand concrete layer 4, ensuring sufficient electron transfer.

[0072] In a preferred implementation of the embodiment of the present invention, Figure 1-Figure 2 As shown, the distribution steel bars include:

[0073] A plurality of longitudinally distributed steel bars 1 are located at the bottom of the shear key groove 9;

[0074] A plurality of transverse distribution steel bars 2 are connected to the longitudinal distribution steel bars 1 .

[0075] Specifically, each longitudinal distribution steel bar 1 is connected to all transverse distribution steel bars 2, and each transverse distribution steel bar 2 is connected to all longitudinal distribution steel bars 1, ensuring the effectiveness of the (electrical) connection between the longitudinal distribution steel bars 1 and the transverse distribution steel bars 2. The longitudinal distribution steel bars 1 and the transverse distribution steel bars 2 form orthogonally distributed steel bars.

[0076] In a preferred implementation of the embodiment of the present invention, Figure 1-Figure 2 As shown, the truss reinforcement includes:

[0077] Two bottom longitudinal steel bars 3 are located between two adjacent longitudinal distribution steel bars 1 and at the bottom of the shear key groove 9;

[0078] Top longitudinal steel bars, located outside the seawater sand concrete layer 4;

[0079] A plurality of connecting steel bars have their ends connected to the bottom longitudinal steel bar 3 and the top longitudinal steel bar respectively.

[0080] Specifically, the bottom longitudinal reinforcement 3 and the longitudinal distribution reinforcement 1 are located in the same plane and are parallel to each other. The connecting reinforcement forms a zigzag shape between the top longitudinal reinforcement and the bottom longitudinal reinforcement 3.

[0081] In a preferred implementation of the embodiment of the present invention, Figure 3As shown, the carbon fiber grid 6 adopts an orthogonal grid, the aperture of the carbon fiber grid 6 is 10mm-50mm, and the carbon fiber content in the carbon fiber grid 6 can be adjusted according to actual needs.

[0082] Specifically, the orthogonal grid is arranged to correspond to the orthogonally distributed steel bars. That is, the orthogonal grid includes longitudinally distributed carbon fibers and transversely distributed carbon fibers. The longitudinally distributed carbon fibers are parallel to the longitudinally distributed steel bars 1, and the transversely distributed carbon fibers are parallel to the transversely distributed steel bars 2. This facilitates the formation of a uniform electric field in the seawater and sea sand concrete layer 4, which can fully remove Cl ions in the seawater and sea sand concrete layer 4. To ensure that the seawater and sea sand concrete passes through the pores of the carbon fiber grid 6, the pore size of the fiber grid can be determined based on the particle size of the sea sand used.

[0083] In a preferred implementation of the embodiment of the present invention, Figure 3 As shown, the depth of the shear key groove 9 is 3mm-15mm, and the diameter or side length of the shear key groove 9 is 10mm-100mm.

[0084] Specifically, the shear key grooves 9 are evenly distributed in the length direction and the width direction of the seawater and sea sand concrete layer 4 to form an array. The shear key grooves 9 are not limited to a shape, for example, they can be circular or square.

[0085] In a preferred implementation of the embodiment of the present invention, Figure 3 As shown, the spacing between two adjacent shear key grooves 9 is 20 mm to 200 mm. Specifically, the spacing between two adjacent shear key grooves 9 can be adjusted as needed.

[0086] In a preferred implementation of the embodiment of the present invention, the conductive mortar protective layer 5 includes: a cement mortar layer and carbon fiber short filaments dispersed in the cement mortar layer.

[0087] Specifically, carbon fiber staple refers to chopped carbon fiber, which is specifically cut into several small segments so that the carbon fiber staple can be evenly dispersed in the cement mortar layer. The carbon fiber staple is dispersed in the cement mortar layer to form a conductive mortar protective layer 5. The conductive mortar protective layer 5 can provide outer physical protection and structural reinforcement for the seawater and sea sand concrete layer 4, and can also form cathodic protection under an external current.

[0088] In a preferred implementation of the embodiment of the present invention, Figure 3 As shown, the carbon fiber grid 6 is connected to the seawater and sea sand concrete layer 4 through an epoxy resin adhesive, and the bonding area of the epoxy resin adhesive does not exceed 10% of the area of the carbon fiber grid 6.

[0089] Specifically, the bonding area of the epoxy resin adhesive refers to the area of the carbon fiber grid bonding portion 10. When the carbon fiber grid 6 is bonded to the surface of the seawater and sea sand concrete layer 4, the epoxy resin adhesive can be locally applied to the seawater and sea sand concrete layer 4. The bonding area shall not exceed 10% of the surface area of the carbon fiber grid 6 to avoid affecting the effect of the impressed current cathodic protection.

[0090] Compared with the existing technology, it has the following beneficial effects:

[0091] 1) The present invention utilizes seawater sand to replace increasingly depleted resources such as freshwater river sand, making full use of the abundant seawater sand resources in coastal areas for the casting of prefabricated reinforced concrete structure composite slabs, thereby reducing material transportation costs, greatly improving the utilization efficiency of seawater sand resources, playing a positive role in protecting the ecological environment, and having great social and economic benefits.

[0092] 2) The present invention employs an ICCP-SS system based on a carbon fiber mesh and a conductive mortar containing carbon fiber staples. Using the carbon fiber mesh as the anode and the steel bars as the cathode, the system protects the steel bars within the seawater-sand concrete composite slab via an applied current, preventing and delaying steel corrosion. Furthermore, the carbon fiber mesh provides structural reinforcement, compensating for and improving the mechanical performance loss of the composite slab due to steel bar corrosion. This results in improved mechanical properties and durability compared to traditional seawater-sand concrete structures.

[0093] Based on the carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite board of any of the above embodiments, the present invention also provides a preferred embodiment of a method for preparing the carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite board:

[0094] The method for preparing a carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab according to an embodiment of the present invention comprises the following steps:

[0095] Step S100: providing a composite slab formwork, a cushion layer, seawater and sea sand concrete, a steel cage, a carbon fiber mesh 6, and a conductive mortar mixed with carbon fiber short filaments; the cushion layer is provided with a plurality of protrusions.

[0096] Specifically, the cushion layer 7 can be a rubber cushion layer, and the surface of the cushion layer 7 has protrusions evenly distributed in the length and width directions, the protrusion height is 3mm-15mm, the plane shape of the protrusion can be but not limited to circular or square, its diameter or side length is 10mm-100mm, and the protrusion spacing is 20mm-200mm. The above dimensions can be appropriately adjusted according to the size of the composite plate.

[0097] The conductive mortar mixed with carbon fiber short filaments is prepared by the following method:

[0098] A1. Provide mortar;

[0099] A2, adding water after stirring the mortar for the first time;

[0100] A3, continue stirring the mortar for a second time and then add carbon fiber short filaments and expansion agent;

[0101] A4. Continue stirring the mortar for a third time and then add a water reducer to make the flat plate expansion of the mortar greater than 250 mm to obtain a conductive mortar mixed with carbon fiber short filaments.

[0102] Specifically, the mortar can be ordinary commercial mortar, with the carbon fiber filaments added at a volumetric rate of 2%. The expansion agent prevents cracking of the conductive mortar protective layer 5, and the water-reducing agent increases the flat expansion of the conductive mortar containing the carbon fiber filaments. The first, second, and third times can be set as needed.

[0103] For example, commercial ordinary mortar is poured into a mixer and stirred for 2-3 minutes to evenly mix the various components of the commercial mortar. Then, the corresponding weight of water calculated according to its standard water-cement ratio is poured into the mixer and stirred for 5 minutes. 2% of the volume of carbon fiber staple fibers and a certain amount of expansion agent are evenly sprinkled into the mixer during the stirring process. After all the fibers are sprinkled in, continue stirring for 2-3 minutes. According to the flat plate expansion of the conductive mortar 5, an appropriate amount of water reducer is added to make its flat plate expansion greater than 250mm.

[0104] The reinforced seawater and sea sand concrete composite slab core cast initially in this application and the subsequent casting form an impressed current cathodic protection and structural reinforcement system.

[0105] Step S200: laying the cushion layer at the bottom of the composite slab formwork and placing the steel cage; the protrusion is set away from the bottom of the composite slab formwork, and the protrusion is in contact with the steel cage.

[0106] Specifically, a cushion layer 7 is laid at the bottom of the composite slab formwork 8, and the length and width of the cushion layer 7 respectively correspond to the length and width of the bottom of the composite slab formwork 8. The rubber cushion has evenly distributed protrusions, which are used to form shear key grooves 9 after the conductive mortar is poured. For example, a rubber cushion layer of a certain thickness is laid at the bottom of the composite slab formwork 8: the length and width of the rubber cushion layer respectively correspond to the length and width of the composite slab, and the surface of the rubber cushion layer has protrusions evenly distributed in the length and width directions, which are used to make shear key grooves 9 that enhance the integrity of the seawater and sea sand concrete 4 and the post-cast conductive mortar protective layer 5. The protrusion height of the rubber cushion layer is 10mm, the protrusion diameter is 10mm, and the spacing is 100mm.

[0107] The reinforcement cage is then placed on the cushion layer so that the reinforcement cage is in contact with the projections, that is, the reinforcement cage is supported by the projections.

[0108] Distribution steel bars and truss steel bars are arranged according to the size of the composite slab, the longitudinal distribution steel bars 1 are placed into the longitudinal steel bar groove of the composite slab formwork 8, and then the truss steel bars are placed, and then the transverse distribution steel bars 2 are placed into the transverse steel bar groove of the composite slab formwork 8, and the transverse distribution steel bars 2 are located above the longitudinal distribution steel bars 1 and the bottom longitudinal steel bars 3. Finally, the distribution steel bars and truss steel bars are tied into a steel cage; the bottom edges of the longitudinal distribution steel bars 1 and the bottom longitudinal steel bars 3 of the truss bars are in contact with the raised top surface of the cushion layer 7.

[0109] Step S300: pouring the seawater and sea sand concrete into the composite slab formwork and solidifying it to form a seawater and sea sand concrete layer 4.

[0110] Specifically, the mixed seawater and sea sand concrete is poured into the composite slab formwork 8 and smoothed; before initial setting, the top surface of the composite slab core is roughened to form a rough composite surface, and the seawater and sea sand concrete is cured to solidify into a seawater and sea sand concrete layer 4, thereby obtaining a reinforced seawater and sea sand concrete composite slab core.

[0111] Step S400: removing the composite slab formwork and the cushion layer to form a shear keyway 9 on the seawater and sea sand concrete layer 4.

[0112] Specifically, after the concrete soil strength reaches the required strength, the reinforced seawater and sea sand concrete composite slab core is inverted, and then the cushion layer is removed to expose the bottom plane of the composite slab core and the shear key groove 9. Since the raised part cannot be poured with seawater and sea sand concrete, the shear key groove 9 will be formed at the raised position on the seawater and sea sand concrete layer 4 after the cushion layer 7 is removed.

[0113] Step S500: Connecting a carbon fiber grid 6 to the side of the seawater and sea sand concrete layer 4 where the shear key groove is located.

[0114] Specifically, a whole piece of carbon fiber mesh 6 is cut according to the dimensions of the prefabricated laminate, with the length and width of the carbon fiber mesh 6 being identical to those of the laminate. The carbon fiber mesh 6 utilizes an orthogonal grid with a 20mm aperture and a single-bundle carbon fiber content of 24K. The carbon fiber mesh 6 is laid flat on the bottom surface of the laminate core and locally bonded with a premixed epoxy resin adhesive to prevent movement. The warp and weft fiber bundles of the carbon fiber mesh 6 are connected to live wires and protected with plastic sleeves to prevent damage during casting. The bonded areas are then cured according to the standard curing time for the epoxy resin used.

[0115] Step S600: After reinstalling the composite plate formwork, pour conductive mortar mixed with carbon fiber short filaments on the carbon fiber mesh 6, so that the conductive mortar mixed with carbon fiber short filaments passes through the carbon fiber mesh 6 to fill the shear key groove 9 and is connected to the steel cage to form a conductive mortar protective layer 5.

[0116] Specifically, the composite board formwork 8 is reinstalled on the inverted composite board core, and the mixed conductive mortar mixed with carbon fiber short fibers is poured into the composite board formwork 8 from the bottom surface of the composite board core to the top surface of the formwork to form a conductive mortar surface layer containing the carbon fiber grid 6; during the pouring process, a flat vibrator is used to fully vibrate the conductive mortar to ensure that the mortar passes through the carbon fiber grid 6 and fully fills the shear key groove 9; after curing, the formwork is removed, and then the composite board is regularly watered and cured to the specified age of 28 days, thereby completing the production of the carbon fiber grid-reinforced seawater and sea sand concrete composite board.

[0117] Step S700: After removing the composite slab formwork again, a power source is used to connect the carbon fiber grid and the steel cage to protect the steel cage, thereby obtaining a carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab.

[0118] Specifically, after the formwork is removed, a power conductor needs to be welded to the exposed ends of the composite plate distribution steel bars and truss bars and connected to the cathode of the DC power supply; the power conductor connected to the carbon fiber mesh 6 is connected to the anode of the DC power supply; the DC power supply is turned on and the intensity is applied at 10mA / m 2 The direct current can protect the steel bars and prevent them from corrosion.

[0119] It should be understood that the application of the present invention is not limited to the above examples. For those skilled in the art, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A method for preparing a carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab, characterized in that: Including steps: Provide a composite plate formwork, a cushion layer, seawater and sea sand concrete, a steel cage, a carbon fiber grid, and a conductive mortar mixed with carbon fiber short filaments; the cushion layer is provided with a plurality of protrusions; The cushion layer is laid on the bottom of the composite plate formwork, and the steel cage is placed; the protrusion is arranged away from the bottom of the composite plate formwork, and the protrusion is in contact with the steel cage; pouring the seawater and sea sand concrete into the composite slab formwork and solidifying it to form a seawater and sea sand concrete layer; removing the composite slab formwork and the cushion layer to form a shear keyway on the seawater and sea sand concrete layer; Connecting a carbon fiber grid to the seawater and sea sand concrete layer on one side where the shear key groove is located; After reinstalling the composite plate formwork, pouring conductive mortar mixed with carbon fiber short filaments on the carbon fiber grid, so that the conductive mortar mixed with carbon fiber short filaments passes through the carbon fiber grid, fills the shear key groove, and is connected to the steel cage to form a conductive mortar protective layer; After the composite slab formwork is removed again, a power source is used to connect the carbon fiber grid and the steel cage to protect the steel cage, thereby obtaining a carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab.

2. The method for preparing the carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab according to claim 1, characterized in that: The protection treatment applies 10 mA / m 2 of DC current.

3. The method for preparing the carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab according to claim 1, characterized in that: The conductive mortar mixed with carbon fiber short filaments is prepared by the following method: Provide mortar; adding water after stirring the mortar for the first time; Continue stirring the mortar for a second time and then add carbon fiber short filaments and expansion agent; After continuing to stir the mortar for a third time, a water reducer is added to make the flat plate expansion of the mortar greater than 250 mm, thereby obtaining a conductive mortar mixed with carbon fiber short filaments.

4. The method for preparing the carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab according to claim 1, characterized in that: The steel cage comprises: Distributed steel bars are embedded in the seawater and sea sand concrete layer; A plurality of truss steel bars are connected to the distribution steel bars.

5. The method for preparing the carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab according to claim 4, characterized in that: The distributed steel bars include: A plurality of longitudinal distribution steel bars are located at the bottom of the shear key groove; A plurality of transverse distribution steel bars are connected to the longitudinal distribution steel bars.

6. The method for preparing the carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab according to claim 5, characterized in that: The truss reinforcement comprises: Two bottom longitudinal steel bars are located between two adjacent longitudinal distribution steel bars and at the bottom of the shear key groove; Top longitudinal steel bars, located outside the seawater and sea sand concrete layer; A plurality of connecting steel bars have two ends respectively connected to the bottom longitudinal steel bar and the top longitudinal steel bar.

7. The method for preparing the carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab according to claim 1, characterized in that: The carbon fiber grid adopts an orthogonal grid, and the aperture of the carbon fiber grid is 10mm-50mm; and / or The depth of the shear keyway is 3mm-15mm, and the diameter or side length of the shear keyway is 10mm-100mm; and / or The distance between two adjacent shear key grooves is 20mm-200mm.

8. The method for preparing the carbon fiber grid ICCP-SS reinforced seawater and sea sand concrete composite slab according to claim 1, characterized in that: The carbon fiber grid is connected to the seawater and sea sand concrete layer through an epoxy resin adhesive, and the bonding area of the epoxy resin adhesive does not exceed 10% of the area of the carbon fiber grid.

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