Fiber bundle, fiber woven mesh and fiber woven mesh reinforced concrete composite material

Abstract

The invention discloses a fiber bundle, a fiber woven mesh and a fiber woven mesh reinforced concrete composite material, and belongs to the technical field of building materials. The technical problem that in an existing fiber woven mesh reinforced concrete composite material, the interface mechanical property of fibers in fiber bundles and a base body is poor is solved. According to the technical scheme, superfine concrete dry powder is attached to the surface of treated continuous fiber yarn, the continuous fiber yarn is twisted to obtain a core layer, the core layer is wrapped with a water-soluble wrapping layer to obtain a fiber bundle, and the fiber bundle is used for preparing a fiber woven mesh; the fiber woven mesh is used for preparing a composite material. The method has the beneficial effects that through fiber surface treatment, the adhesive force of the superfine concrete dry powder on the surfaces of the continuous fibers is improved, the adhesion uniformity is good, and the interface performance between the continuous fibers and a matrix can be effectively improved, so that the mechanical property of the composite material is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and in particular relates to a fiber bundle, a fiber woven mesh, and a fiber woven mesh reinforced concrete composite material. Background Art

[0002] Fiber woven mesh reinforced concrete composites are widely used in the fields of lightweight design of new buildings and reinforcement of existing building structures due to their excellent mechanical properties and lightweight characteristics. However, due to the poor permeability of the concrete matrix in the fiber bundle, the fiber filaments on the outer surface of the fiber bundle are well bonded to the concrete matrix, but there are a large number of pores inside the fiber bundle, which seriously affects the mechanical properties of fiber woven mesh reinforced concrete composites and affects its further promotion and application. There are currently three main technical solutions:

[0003] (1) Fiber filaments or fiber bundles are directly twisted to form fiber bundles and then mixed with cement matrix to form composite materials. This method can improve the synergistic effect between fiber filaments to a certain extent. However, this method still has the problem that the cement matrix cannot effectively infiltrate the fiber filaments inside the fiber bundle. In addition, the synergistic effect of the fiber filaments is improved after twisting, but the tension of each fiber filament is different, and the performance utilization rate of the fiber filaments is low.

[0004] (2) The fiber bundle is infiltrated and cured with resin to form a fiber-reinforced resin-based composite fabric grid, which is then mixed with a cement matrix to form a fabric-reinforced cement-based composite material. This method utilizes the excellent wettability and mechanical properties of the resin matrix, which can significantly improve the synergistic effect of the fiber filaments in the fiber bundle and further significantly improve the mechanical properties of the fabric-reinforced cement-based composite material. However, this method is costly and the mechanical properties are severely degraded in high-temperature environments such as fire.

[0005] (3) The fiber filaments or fiber bundles are pre-impregnated with concrete or cement slurry for a certain period of time, and then prepared into a composite material with the concrete matrix. This method can improve the interfacial bonding performance between the fiber filaments and the concrete or cement matrix to a certain extent through the pre-impregnation operation, and has a good effect on improving mechanical properties. However, this method is only applicable to operations within the factory. When it is necessary to prepare the structure at the construction site, the fiber woven mesh and concrete prepreg prepared in advance in the factory are easy to solidify during transportation, affecting the construction; if the pre-impregnation operation is performed at the construction site, on the one hand, it is necessary to build complex impregnation processing equipment on site, and on the other hand, the construction steps are complicated and time-consuming, which is not convenient for on-site application.

[0006] Existing patents improve the interfacial bonding performance between fiber filaments and concrete matrix by adding ultrafine concrete dry powder into the fiber bundle in advance. For example, CN118292598A discloses a method for preparing and constructing fiber woven mesh reinforced concrete and its composite material. The composite material consists of a fiber mesh and a concrete matrix. The fiber mesh is woven from embedded tubular fiber bundles. The embedded tubular fiber bundles are prepared by pouring ultrafine concrete dry powder into hollow tubules prepared from water-soluble materials, and mixing a plurality of hollow tubules containing ultrafine concrete dry powder with a plurality of fiber filaments. After the soaked fiber woven mesh is laid on the concrete matrix layer, after a period of time, the water-cement ratio of the ultrafine concrete in the fiber bundle gradually tends to be consistent with the concrete matrix layer, thereby improving the interfacial performance between the fiber filaments and the concrete matrix. However, the filling process of the ultrafine concrete dry powder in the interstitial tubules is prone to the entry of a certain amount of air, resulting in a relatively uneven distribution of the ultrafine concrete dry powder, which may affect the mechanical properties of the fiber woven mesh reinforced concrete. Summary of the invention

[0007] In view of the key problem that the interface mechanical properties between the fiber filaments inside the fiber bundle and the matrix in the existing fiber woven mesh reinforced concrete composite materials are weak, as well as the defects of the existing technical solutions, the first purpose of the present invention is to provide a fiber bundle; the second purpose is to provide a fiber woven mesh obtained by weaving the fiber bundle and then dissolving the wrapping layer in water; the third purpose is to provide a fiber woven mesh reinforced concrete composite material made by mixing the fiber woven mesh with a concrete matrix, which can improve the interface bonding properties between the fiber filaments in the fiber bundle and the concrete matrix, effectively enhance the mechanical properties of the fiber woven mesh reinforced concrete composite material, and at the same time achieve the effect of being able to be prepared in the factory and on the construction site, thereby improving construction efficiency, reducing construction costs, and avoiding dust pollution during construction.

[0008] To achieve the above objectives, the present invention adopts the following technical scheme: a fiber bundle, comprising a core layer and a wrapping layer coated on the surface of the core layer, the core layer is composed of twisted fiber yarns and ultrafine concrete dry powder attached to the surface of the twisted fiber yarns, and the wrapping layer is a hollow tube made of a water-soluble material or is formed by winding a water-soluble film around the surface of the core layer.

[0009] Furthermore, the method for preparing the fiber bundle comprises the following steps:

[0010] (101) dividing the original fiber yarn into continuous fiber filaments arranged in parallel one by one, with gaps between the fiber filaments;

[0011] (102) performing surface treatment on the continuous fiber filaments arranged in parallel one by one;

[0012] (103) The treated continuous fiber filaments are attached with ultrafine concrete dry powder;

[0013] (104) twisting the continuous fiber filaments attached with ultrafine concrete dry powder to obtain twisted fiber filaments containing ultrafine concrete dry powder;

[0014] (105) A hollow tube made of a water-soluble material is sleeved on the surface of a fiber twisted yarn containing ultrafine concrete dry powder, or a water-soluble film is wrapped around the surface of a fiber twisted yarn containing ultrafine concrete dry powder to obtain a fiber bundle.

[0015] Furthermore, in step (101), the fiber separation method is to use a fiber separation machine.

[0016] Furthermore, in step (102), the surface treatment method is to spray water mist on the continuous fiber yarn in a fiber yarn surface treatment box so that a trace amount of moisture adheres to the surface of the continuous fiber yarn, to rub / energize the continuous fiber yarn in a fiber yarn surface treatment box so that the continuous fiber yarn generates static electricity, or to impregnate the surface of the continuous fiber yarn with an adhesive in a fiber yarn surface treatment box.

[0017] Furthermore, in step (103), the attachment method is to transfer the continuous fiber filaments to an ultrafine concrete dry powder box and vibrate the ultrafine concrete dry powder box, to agitate the ultrafine concrete dry powder in the ultrafine concrete dry powder box by wind, to spray the ultrafine concrete dry powder in the ultrafine concrete dry powder box, to pass the continuous fiber filaments through an ultrafine concrete dry powder pile in the ultrafine concrete dry powder box, or to make the ultrafine concrete in the ultrafine concrete dry powder box have an electric charge opposite to that of the continuous fiber filaments.

[0018] Furthermore, in step (104), the twisting method is to use a fiber twisting device.

[0019] Furthermore, in step (105), the sleeve installation method is to use a sleeve machine.

[0020] A fiber braided net is formed by braiding the above-mentioned fiber bundles and then removing the wrapping layer through water dissolution.

[0021] A fiber braided mesh reinforced concrete composite material consists of a concrete matrix and a fiber braided mesh. The fiber braided mesh is formed by weaving the above-mentioned fiber bundles and then removing the wrapping layer through water dissolution.

[0022] The construction method of the fiber woven mesh reinforced concrete composite material comprises the following steps:

[0023] (10) preparing a fiber bundle, using the fiber bundle to prepare a fiber woven net, and soaking the fiber woven net in water at a construction site;

[0024] (20) laying a concrete base layer on the surface of the mold or the structure to be constructed, laying the fiber woven mesh with the wrapping layer removed on the concrete base layer, and laying another concrete base layer on the fiber woven mesh;

[0025] (30) Using a concrete vibrator to vibrate the concrete base layer;

[0026] (40) repeating steps (20) to (30) until the number of layers of the fiber woven mesh reaches a set value;

[0027] (50) After the product of step (40) is solidified, a curing treatment is performed to obtain a fiber woven mesh reinforced concrete composite material.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) By treating the continuous fiber filaments, the treated continuous fiber filaments can improve the surface adhesion of the fiber filaments and evenly adhere to the ultrafine concrete powder, which is conducive to the good uniformity of the fiber filaments twisted with the ultrafine concrete powder. The hollow tube is easier to be sleeved on the surface of the fiber twisted filaments containing the ultrafine concrete powder by using a sleeve machine, and the ultrafine concrete powder evenly adhered to the fiber woven net can significantly improve the bonding effect between the fiber filaments and the concrete matrix after the immersion operation, thereby significantly improving the mechanical properties of the fiber woven net reinforced concrete composite material; while the method of directly mixing the ultrafine concrete powder with the fiber filaments is simple to operate, because the surface of the fiber filaments is not treated, the adhesion of the ultrafine concrete powder on the surface of the fiber filaments is poor, and the ultrafine concrete powder is not evenly attached to the surface of the fiber filaments, so that the bonding between the fiber filaments and the matrix is ​​not well improved, and the bonding uniformity effect is not good;

[0030] (2) The fiber bundle of the present invention adopts a water-soluble wrapping layer, which can ensure that the water can effectively contact the ultrafine concrete dry powder in the fiber bundle after the immersion operation, and can also ensure that the fiber woven net containing the ultrafine concrete dry powder can effectively keep the ultrafine concrete dry powder in the fiber bundle during transportation and preparation, and effectively reduce dust pollution;

[0031] (3) The surface adhesion of the fiber is improved by treating the fiber surface, a certain amount of ultrafine concrete dry powder is attached to the surface of the continuous fiber, and the continuous fiber is twisted, and then the fiber bundle is obtained by wrapping the hollow tube prepared by the water-soluble film, and further prepared into a fiber woven mesh, and finally the fiber woven mesh is transported to the construction site and mixed with the concrete matrix to prepare a composite material, which has the advantages of convenient construction and low cost, can be prepared in the factory or on the construction site, and has a wider range of applications; if the final product is a fiber woven mesh reinforced concrete sheet or structure of a uniform model, the fiber bundle, fiber woven mesh, and fiber woven mesh reinforced concrete composite material can be completed in the factory; if the structure needs to be repaired or reinforced at the construction site, the fiber bundle and the fiber woven mesh without water dissolution to remove the wrapping layer are pre-prepared in the factory, and the fiber woven mesh reinforced concrete composite material can be operated at the construction site;

[0032] (4) It should be noted that the mechanical properties of concrete are closely related to the water-cement ratio. The proportion of the ultrafine concrete in the fiber bundle of the present invention in the entire fiber woven mesh reinforced concrete composite material is relatively low, about 1%. After the fiber woven mesh is soaked in water and laid on the concrete matrix layer, after a period of time, the water-cement ratio of the ultrafine concrete in the fiber bundle gradually tends to be consistent with the concrete matrix layer. Therefore, the water-cement ratio of the ultrafine concrete in the fiber bundle can be indirectly controlled by the water-cement ratio in the concrete matrix layer, which can ensure that the mechanical properties of the ultrafine concrete in the fiber bundle are within a controllable range. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a flow chart of the preparation of the fiber bundle of the present invention;

[0034] Figure 2 is a schematic structural diagram of a fiber bundle of the present invention;

[0035] Among them, 11, original fiber yarn; 12, continuous fiber filament; 13, fiber bundle; 131, core layer; 132, wrapping layer; 21, fiber splitting machine; 22, fiber surface treatment box; 23, ultra-fine concrete dry powder box; 24, fiber twisting machine; 25, casing machine. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below so that those skilled in the art can better understand the advantages and features of the present invention, thereby making a clearer definition of the protection scope of the present invention. The embodiments described in the present invention are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0037] Example 1

[0038] The fiber bundle of this embodiment, such as Figure 2 As shown, the fiber bundle 13 includes a core layer 131 and a wrapping layer 132. The core layer 131 is composed of a plurality of twisted fiber filaments and ultrafine concrete dry powder attached to the surface of the twisted fiber filaments, and the wrapping layer 132 is a hollow tube made of a water-soluble material.

[0039] like Figure 1 As shown, the fiber bundle of this embodiment is prepared by the following steps:

[0040] (101) using a fiber splitting machine 21 to split the original fiber yarn 11 into continuous fiber filaments 12 arranged in parallel one by one, with gaps between the fiber filaments;

[0041] (102) frictionally treating the continuous fiber filaments 12 arranged in parallel one by one in a fiber filament surface treatment box 22 to generate static electricity;

[0042] (103) The electrostatically treated continuous fiber filaments are placed in the ultrafine concrete dry powder box 23 so that the ultrafine concrete with an electric charge opposite to that of the continuous fiber filaments is attached to the ultrafine concrete dry powder;

[0043] (104) twisting the fiber filaments attached with ultrafine concrete powder using a fiber twisting machine 24 to obtain twisted fiber filaments containing ultrafine concrete powder;

[0044] (105) A hollow tube made of a water-soluble material is sleeved onto the surface of the fiber twisted yarn containing ultrafine concrete dry powder using a sleeve machine 25 to obtain a fiber bundle 13.

[0045] The fiber woven net of this embodiment is formed by weaving the above-mentioned fiber bundles and then removing the wrapping layer through water dissolution.

[0046] The fiber braided mesh reinforced concrete composite material of this embodiment is prepared by the following steps:

[0047] (10) preparing the fiber bundles mentioned above; releasing the electric charge of the fiber bundles by grounding to prepare a sleeve-type fiber woven net, and soaking the sleeve-type fiber woven net in water at the construction site to obtain the fiber woven net mentioned above;

[0048] (20) laying a concrete base layer in the mold, laying the fiber woven mesh with the wrapping layer removed on the concrete base layer, and laying another concrete base layer on the fiber woven mesh;

[0049] (30) Using a concrete vibrator to vibrate the concrete base layer;

[0050] (40) repeating steps (20) to (30) until the number of fiber woven mesh layers reaches a set value;

[0051] (50) After the product of step (40) is solidified, a curing treatment is performed to obtain a fiber woven mesh reinforced concrete composite material.

[0052] Example 2

[0053] The fiber bundle of this embodiment, such as Figure 2 As shown, the fiber bundle 13 includes a core layer 131 and a wrapping layer 132. The core layer 131 is composed of a plurality of twisted fibers and ultrafine concrete dry powder attached to the surface of the twisted fibers. The wrapping layer 132 is formed by wrapping a water-soluble film around the surface of the core layer.

[0054] like Figure 1 As shown, the fiber bundle of this embodiment is prepared by the following steps:

[0055] (101) using a fiber splitting machine 21 to split the original fiber yarn 11 into continuous fiber filaments 12 arranged in parallel one by one, with gaps between the fiber filaments;

[0056] (102) spraying water mist on the continuous fiber filaments 12 arranged in parallel one by one in the fiber filament surface treatment box 22 so that a trace amount of water adheres to the surface of the continuous fiber filaments;

[0057] (103) the continuous fiber filaments after the moisture adhesion treatment are passed through the ultra-fine concrete dry powder pile in the ultra-fine concrete dry powder box 23 to adhere to the ultra-fine concrete dry powder;

[0058] (104) twisting the fiber filaments attached with ultrafine concrete powder using a fiber twisting machine 24 to obtain twisted fiber filaments containing ultrafine concrete powder;

[0059] (105) A hollow tube made of a water-soluble material is sleeved onto the surface of the fiber twisted yarn containing ultrafine concrete dry powder using a sleeve machine 25 to obtain a fiber bundle 13.

[0060] The fiber woven net of this embodiment is formed by weaving the above-mentioned fiber bundles and then removing the wrapping layer through water dissolution.

[0061] The fiber braided mesh reinforced concrete composite material of this embodiment is prepared by the following steps:

[0062] (10) preparing the fiber bundles mentioned above; preparing a sleeve-type fiber woven net, and soaking the sleeve-type fiber woven net in water at a construction site to obtain the fiber woven net;

[0063] (20) laying a concrete base layer on the surface of the structure to be reinforced, laying the fiber woven mesh with the wrapping layer removed on the concrete base layer, and laying another concrete base layer on the fiber woven mesh;

[0064] (30) Using a concrete vibrator to vibrate the concrete base layer;

[0065] (40) repeating steps (20) to (30) until the number of fiber woven mesh layers reaches a set value;

[0066] (50) After the product of step (40) is solidified, a curing treatment is performed to obtain a fiber woven mesh reinforced concrete composite material.

[0067] In the present invention, if the final product is a fiber woven mesh reinforced concrete sheet or structure of a uniform model, the fiber bundles, fiber woven mesh, and fiber woven mesh reinforced concrete composite materials can be completed in a factory; if it is necessary to carry out structural construction or reinforcement at a construction site, the fiber bundles and the fiber woven mesh without removing the soluble wrapping layer can be pre-finished in the factory, and the fiber woven mesh reinforced concrete composite material can be operated at the construction site, which can effectively improve the on-site construction efficiency and reduce dust pollution at the construction site.

[0068] In the fiber surface treatment box, a small amount of moisture is attached to the surface of the continuous fiber by spraying water mist or the like. Under the condition that the continuous fiber can effectively adsorb the ultrafine concrete dry powder, the spray amount is as small as possible, and the specific spray amount can be determined through multiple tests. The surface of the continuous fiber is impregnated with a material such as resin that has a certain viscosity and good mechanical properties after curing for surface treatment, so as to improve the adhesion effect of the continuous fiber surface on the ultrafine concrete dry powder.

[0069] For ultrafine concrete powder, the powder particle size is as small as possible to ensure the wettability of ultrafine concrete and continuous fiber filaments after immersion in water; the concrete matrix has no specific requirements on the size of component materials, which can be adjusted according to the specific needs of the project; for the wrapping layer, the water-soluble material can be a film material such as PVA that is quickly water-soluble and has a certain elasticity and strength. The thickness of the hollow tube is preferably thin while ensuring that it is not damaged during the preparation process; the water-soluble film is wrapped around the surface of the fiber twisted filament containing ultrafine concrete dry powder by winding, so as to ensure that the ultrafine concrete dry powder attached to the fiber bundle does not fall off.

[0070] For the construction method of fiber woven mesh reinforced concrete composite material, wherein, in step (10), the immersion method can be immersion in a pool or immersion in a spraying aqueous solution, and the immersion time is suitable for the water-soluble hollow tube to be completely dissolved, the ultrafine concrete in the fiber bundle is fully fused with water, and the ultrafine concrete slurry can still be effectively retained in the fiber bundle. The specific immersion time can be determined by experiments; in step (20), if the final product is a thin plate or structure of the same model, the operation can be carried out in a mold, and the mold surface needs to be routinely cleaned; if it is on-site construction, the surface to be constructed needs to be routinely cleaned first; in step (30), according to the specific project needs, different types of concrete vibrators such as plug-in type, attached type, flat plate type, etc. can be selected for vibration operation.

[0071] The above are only preferred implementations of the present invention. 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. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A fiber bundle, characterized in that: The fiber bundle includes a core layer and a wrapping layer coated on the surface of the core layer. The core layer is composed of twisted fiber yarns and ultrafine concrete dry powder attached to the surface of the twisted fiber yarns. The wrapping layer is a hollow tube made of water-soluble material or a water-soluble film wrapped around the surface of the core layer.

2. The fiber bundle according to claim 1, characterized in that The method for preparing the fiber bundle comprises the following steps: (101) dividing the original fiber yarn into continuous fiber filaments arranged in parallel one by one, with gaps between the fiber filaments; (102) performing surface treatment on the continuous fiber filaments arranged in parallel one by one; (103) The treated continuous fiber filaments are attached with ultrafine concrete dry powder; (104) twisting the continuous fiber filaments attached with ultrafine concrete dry powder to obtain twisted fiber filaments containing ultrafine concrete dry powder; (105) A hollow tube made of a water-soluble material is sleeved on the surface of a fiber twisted yarn containing ultrafine concrete dry powder, or a water-soluble film is wrapped around the surface of a fiber twisted yarn containing ultrafine concrete dry powder to obtain a fiber bundle.

3. The fiber bundle according to claim 2, characterized in that In step (101), the fiber separation method is to use a fiber separation machine.

4. The fiber bundle according to claim 2, characterized in that In step (102), the surface treatment method is to spray water mist on the continuous fiber yarn in a fiber yarn surface treatment box so that a trace amount of moisture adheres to the surface of the continuous fiber yarn, to rub / energize the continuous fiber yarn in a fiber yarn surface treatment box so that the continuous fiber yarn generates static electricity, or to impregnate the surface of the continuous fiber yarn with an adhesive in a fiber yarn surface treatment box.

5. The fiber bundle according to claim 2, characterized in that In step (103), the attachment method is to transfer the continuous fiber filaments to the ultrafine concrete dry powder box and vibrate the ultrafine concrete dry powder box, to agitate the ultrafine concrete dry powder in the ultrafine concrete dry powder box by wind, to spray the ultrafine concrete dry powder in the ultrafine concrete dry powder box, to pass the continuous fiber filaments through the ultrafine concrete dry powder pile in the ultrafine concrete dry powder box, or to make the ultrafine concrete in the ultrafine concrete dry powder box have an electric charge opposite to the electric charge of the continuous fiber filaments.

6. The fiber bundle according to claim 2, characterized in that In step (104), the twisting method is to use a fiber twisting machine.

7. The fiber bundle according to claim 2, characterized in that In step (105), the sleeve installation method is to use a sleeve machine.

8. A fiber woven mesh, characterized in that: The fiber bundle according to any one of claims 1 to 7 is knitted and then dissolved in water to remove the wrapping layer.

9. A fiber braided mesh reinforced concrete composite material, characterized in that: The invention is composed of a concrete matrix and a fiber woven net, wherein the fiber woven net is formed by weaving the fiber bundles according to any one of claims 1 to 7 and then removing the wrapping layer through water dissolution.

10. The construction method of the fiber braided mesh reinforced concrete composite material according to claim 9, characterized in that: The steps include: (10) preparing a fiber bundle, using the fiber bundle to prepare a fiber woven net, and soaking the fiber woven net in water at a construction site; (20) laying a concrete base layer on the surface of the mold or the structure to be constructed, laying the fiber woven mesh with the wrapping layer removed on the concrete base layer, and laying another concrete base layer on the fiber woven mesh; (30) Using a concrete vibrator to vibrate the concrete base layer; (40) repeating steps (20) to (30) until the number of layers of the fiber woven mesh reaches a set value; (50) After the product of step (40) is solidified, a curing treatment is performed to obtain a fiber woven mesh reinforced concrete composite material.

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