Glass fiber reinforcing rib and application
Through the combination of glass fiber reinforced ribs designed with a three-layer composite structure, the inner load-bearing core, the intermediate transition layer and the outer protective layer, the problem of difficulty in taking into account both alkali resistance and mechanical properties in the prior art is solved, and the balance between material stability and high load-bearing capacity in a highly alkaline environment is achieved, and production costs are reduced.
Patent Information
- Application Number
- CN202510987231.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-17
- Publication Date
- 2025-08-15
AI Technical Summary
The existing glass fiber reinforced ribs are difficult to take into account both alkali resistance and mechanical properties, and a single material system cannot meet the requirements of use in high corrosion environments at the same time.
The three-layer composite structure is designed, the inner layer is a coaxial bundle of high elastic modulus glass fibers, the intermediate transition layer is a mixture of high elastic modulus glass fibers and alkali-resistant glass fibers, and the outer layer is an alkali-resistant glass fiber protective layer. The synergistic optimization of mechanical properties and alkali-resistant resistance is achieved through the partition design of the functional layer.
The long-term stability and high load-bearing capacity of materials in high alkaline environments are achieved, which significantly reduces production costs.
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Figure CN120486660A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of civil engineering composite materials, and in particular to a glass fiber reinforced bar and its application. Background Art
[0002] Since the 19th century, concrete structures, based on cement, steel, and glass, have been widely used in the global construction industry. Steel in alkaline concrete is protected by a protective system formed by cement, sand, and stone, giving reinforced concrete structures a certain degree of durability. However, when the concrete cover is insufficiently thick or when there are flaws in the design and construction process, particularly in projects with harsh environmental conditions, such as coastal buildings exposed to long-term erosion by salty seawater, dams and bridges in cold regions using ice salt antifreeze, and chemical engineering structures, carbides and chlorides can invade the concrete under certain temperature and humidity conditions, gradually neutralizing the alkaline concrete. This process destroys the passivation film on the surface of the steel bars, causing them to corrode. As the steel bars rust, their volume increases compared to the original metal, generating tremendous pressure within the concrete, which can lead to cracking and spalling in the building, ultimately threatening the overall structural safety and even causing collapse.
[0003] In order to solve the problem of steel corrosion in reinforced concrete structures, glass fiber reinforced bars came into being. As a reinforcing material for cement concrete, it can replace traditional steel bars. However, after ordinary Portland cement is hydrated, a high concentration of With NaOH / KOH, the pH value can reach 12.5-13.8, forming a strong alkaline environment that can last for decades. In this environment, the glass fiber is in a state similar to being immersed in a corrosive solution for a long time, so it must have good alkali resistance.
[0004] At present, most glass fiber reinforcement bars on the market are made of a single type of glass fiber, the most common of which are alkali-free glass fiber and / or ECR glass fiber, ECR glass fiber and alkali-resistant glass fiber, which are impregnated with vinyl ester resin or epoxy resin and made by pultrusion. However, it is difficult for a single glass fiber reinforcement bar to meet the requirements of alkali resistance, tensile properties and economy at the same time. For example, although all-alkali-resistant glass fiber reinforcement bars have excellent alkali resistance, their tensile properties are poor and their cost is high; although pure ordinary alkali-free glass fiber or ECR glass fiber reinforcement bars have good economy and tensile properties, there is a risk of fiber erosion when used for a long time in a high-alkali concrete environment with a pH value greater than 13, which will cause their strength to gradually decay, thus limiting their application in high-corrosion environment engineering. Summary of the Invention
[0005] In view of this, the purpose of this application is to provide a glass fiber reinforced rib and its application, which is used to solve the defects of the existing glass fiber reinforced ribs that have a single structure and cannot take into account both alkali resistance and mechanical properties.
[0006] In order to achieve the above technical objectives, the present application provides a glass fiber reinforced rib, which includes a three-layer composite structure, which includes, from the inside to the outside, an inner load-bearing core, a middle transition layer, and an outer protective layer;
[0007] The inner layer load-bearing core is formed by arranging high elastic modulus glass fibers in the same direction along the axial direction of the glass fiber reinforcement ribs, and the high elastic modulus glass fibers include at least one of alkali-free glass fibers and ECR glass fibers;
[0008] The middle transition layer is coated on the outer surface of the inner load-bearing core and is made of a mixture of high elastic modulus glass fiber and alkali-resistant glass fiber;
[0009] The outer protective layer is coated on the outer surface of the middle transition layer and is composed of alkali-resistant glass fiber.
[0010] Furthermore, in the intermediate transition layer, the high elastic modulus glass fibers and the alkali-resistant glass fibers are alternately arranged in the same direction along the axial direction of the glass fiber reinforcement ribs.
[0011] Furthermore, the alkali-resistant glass fibers of the outer protective layer are arranged in the same direction along the axial direction of the glass fiber reinforcement ribs.
[0012] Furthermore, the cross-sectional area of the inner load-bearing core accounts for 50% to 70% of the total cross-sectional area of the glass fiber reinforced bar; the cross-sectional area of the middle transition layer accounts for 20% to 30% of the total cross-sectional area of the glass fiber reinforced bar; and the cross-sectional area of the outer protective layer accounts for 10% to 20% of the total cross-sectional area of the glass fiber reinforced bar.
[0013] Furthermore, in the intermediate transition layer, the cross-sectional area ratio of the high elastic modulus glass fiber to the alkali-resistant glass fiber is (1-2): (1-2).
[0014] Furthermore, the intermediate transition layer comprises at least two glass fiber monofilament layers, and the glass fiber monofilament layers are composed of high elastic modulus glass fiber monofilaments and alkali-resistant glass fiber monofilaments arranged alternately; the high elastic modulus glass fiber monofilaments and alkali-resistant glass fiber monofilaments of adjacent glass fiber monofilament layers are arranged alternately.
[0015] Furthermore, the components of the high elastic modulus glass fiber include, by mass percentage, 52% to 62% silicon oxide, 9% to 15% aluminum oxide, and 16% to 25% calcium oxide.
[0016] Furthermore, the components of the alkali-resistant glass fiber include, by mass percentage, 1% to 18% zirconium oxide.
[0017] The present application provides a concrete structural member including glass fiber reinforced bars.
[0018] The present application provides an application of glass fiber reinforced bars or concrete structural parts, which are applied in a strong alkaline corrosive environment.
[0019] In summary, the present application proposes a glass fiber reinforced rib, which adopts a three-layer composite design: from the inside to the outside, there are an inner load-bearing core, an intermediate transition layer and an outer protective layer. The inner load-bearing core is composed of a coaxially arranged bundle of high elastic modulus glass fibers; the intermediate transition layer is coated on the outer surface of the inner load-bearing core, and is constructed by mixing high elastic modulus glass fibers and alkali-resistant glass fibers; the outer protective layer is coated on the outer surface of the intermediate transition layer, and is composed of alkali-resistant glass fibers. Through the design of a fiber composite structure, the present application achieves effective control of production costs by directional application of high elastic modulus glass fibers with significant cost advantages in high-load-bearing areas; at the same time, an alkali-resistant protective barrier composed of alkali-resistant fibers is constructed on the outer layer to ensure the long-term stability of the material in an alkaline environment; the intermediate transition layer is used to coordinate the mechanical and chemical properties of two fibers with different performances. The glass fiber reinforced ribs obtained by the above three-layer composite design have the dual technical advantages of high mechanical bearing performance and excellent alkali corrosion resistance.
[0020] Compared with the existing technology, the glass fiber reinforced ribs proposed in this application not only achieve a balance between mechanical properties and alkali resistance, but also significantly reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0022] Figure 1 A schematic cross-sectional view of a glass fiber reinforced rib provided in an embodiment of the present application;
[0023] Reference numerals: 1. inner load-bearing core; 2. middle transition layer; 3. outer protective layer. DETAILED DESCRIPTION
[0024] The following will clearly and completely describe the technical solutions of the embodiments of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection requested by this application.
[0025] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0026] Unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application.
[0027] The sources of all raw materials in the present invention are not particularly limited and can be purchased on the market or prepared according to conventional methods known to those skilled in the art.
[0028] The present application provides a glass fiber reinforced rib, which comprises a three-layer composite structure, which comprises, from the inside to the outside, an inner load-bearing core, a middle transition layer, and an outer protective layer;
[0029] The inner layer load-bearing core is formed by arranging high elastic modulus glass fibers in the same direction along the axial direction of the glass fiber reinforcement ribs, and the high elastic modulus glass fibers include at least one of alkali-free glass fibers and ECR glass fibers;
[0030] The middle transition layer is coated on the outer surface of the inner load-bearing core and is made of a mixture of high elastic modulus glass fiber and alkali-resistant glass fiber;
[0031] The outer protective layer is coated on the outer surface of the middle transition layer and is composed of alkali-resistant glass fiber.
[0032] In some embodiments, in the intermediate transition layer, the high elastic modulus glass fibers and the alkali-resistant glass fibers are alternately arranged in the same direction along the axial direction of the glass fiber reinforcement ribs.
[0033] It should be noted that this embodiment achieves synergistic optimization of mechanical properties and alkali resistance through a hierarchical functional zoning design: Compared to all-alkali-resistant fiberglass reinforcement, the composite strategy of partially replacing alkali-resistant fibers with high-modulus fibers significantly reduces raw material costs while ensuring structural load-bearing efficiency through the inner high-modulus fiber bundles. The outer alkali-resistant fiber layer creates a corrosion protection barrier, breaking through the trade-off between mechanical strength and alkali resistance in a single material system. This layered design leverages the mechanical advantages of high-modulus fibers to enhance load-bearing capacity while achieving environmental protection through the chemical stability of alkali-resistant fibers, forming a composite reinforcement system that combines cost-effectiveness with performance advantages.
[0034] In some embodiments, in the intermediate transition layer, the high elastic modulus glass fibers and the alkali-resistant glass fibers are alternately arranged in the same direction along the axial direction of the glass fiber reinforcement ribs.
[0035] In some embodiments, the alkali-resistant glass fibers of the outer protective layer are arranged in the same direction along the axial direction of the glass fiber reinforcement ribs.
[0036] In some embodiments, the cross-sectional area of the inner load-bearing core accounts for 50% to 70% of the total cross-sectional area of the glass fiber reinforced ribs; the cross-sectional area of the middle transition layer accounts for 20% to 30% of the total cross-sectional area of the glass fiber reinforced ribs; and the cross-sectional area of the outer protective layer accounts for 10% to 20% of the total cross-sectional area of the glass fiber reinforced ribs.
[0037] It should be noted that by adjusting the proportion of each functional layer in the radial cross-sectional area of the glass fiber reinforced rib, precise adjustment of the radial thickness of the functional layer can be achieved.
[0038] In some embodiments, in the intermediate transition layer, the cross-sectional area ratio of the high elastic modulus glass fiber to the alkali-resistant glass fiber is (1-2): (1-2).
[0039] In some embodiments, the intermediate transition layer comprises at least two glass fiber monofilament layers, wherein the glass fiber monofilament layers are composed of alternating high elastic modulus glass fiber monofilaments and alkali-resistant glass fiber monofilaments; the high elastic modulus glass fiber monofilaments and alkali-resistant glass fiber monofilaments of adjacent glass fiber monofilament layers are staggered.
[0040] In some embodiments, the high elastic modulus glass fiber comprises, by mass percentage, 52% to 62% silicon oxide, 9% to 15% aluminum oxide, and 16% to 25% calcium oxide.
[0041] In some embodiments, the composition of the alkali-resistant glass fiber includes, by mass percentage, 1% to 18% zirconium oxide.
[0042] It should be noted that the composition and content of alkali-resistant and alkali-free glass fibers play a key role in improving material performance. Alkali-resistant glass fibers, with zirconium oxide as their core component, form a chemical barrier against alkaline corrosion, ensuring the long-term stability of the material. Alkali-free glass fibers, with silicon oxide, aluminum oxide, and calcium oxide as their primary components, work together to create a rigid network structure. Precisely controlling the content of these three elements can achieve enhanced mechanical properties.
[0043] In some specific embodiments, the alkali-free glass fiber was purchased from Taishan Glass Fiber Co., Ltd., with the brand name CTGEDR480-T910; the alkali-resistant glass fiber was purchased from Taishan Glass Fiber Co., Ltd., with the brand name CTG AR Cem-FIL ® 5325-2400, more detailed composition ratios and physicochemical parameters are shown in Table 1.
[0044] Table 1. Component ratio and physical and chemical parameter values of glass fiber
[0045]
[0046] An embodiment of the present application provides a concrete structural member, comprising the above-mentioned glass fiber reinforced bars.
[0047] The embodiments of the present application provide an application of glass fiber reinforced bars or concrete structural parts, which are applied in a strong alkaline corrosive environment.
[0048] The applicant further provides the following reference specific embodiments to describe the present invention. It should be noted that these embodiments are merely illustrative and do not limit the present invention in any way.
[0049] Example 1
[0050] See also Figure 1 , this embodiment provides a glass fiber reinforced rib with an outer diameter of 16 mm (radius of 8 mm) and a three-layer composite structure, which consists of an inner load-bearing core, a middle transition layer, and an outer protective layer from the inside to the outside;
[0051] The proportion of the cross-sectional area of each layer in the total cross-sectional area of the glass fiber reinforced bar is as follows: inner load-bearing core 70% (radius 6.7mm), middle transition layer 20% (radial thickness 0.9mm), outer protective layer 10% (radial thickness 0.4mm);
[0052] The inner load-bearing core is made of single-filament alkali-free glass fibers arranged in the same direction along the axial direction of the glass fiber reinforcement to form the main load-bearing structure;
[0053] The intermediate transition layer is formed by multiple layers of glass fiber monofilaments. These layers are composed of high-elastic modulus glass fiber monofilaments and alkali-resistant glass fiber monofilaments, arranged alternately along the axial direction of the glass fiber reinforcement and tightly wrapped around the outer surface of the inner load-bearing core. Adjacent glass fiber monofilament layers have high-elastic modulus glass fiber monofilaments and alkali-resistant glass fiber monofilaments interlaced. In the intermediate transition layer, the cross-sectional area ratio of alkali-free glass fiber to alkali-resistant glass fiber is 1:1.
[0054] The outer protective layer uses alkali-resistant glass fiber which is arranged in the same direction along the axial direction of the glass fiber reinforcement ribs and wrapped around the outer surface of the middle transition layer.
[0055] In this embodiment, the alkali-free glass fiber was purchased from Taishan Glass Fiber Co., Ltd., with the brand name CTG EDR480-T910; the alkali-resistant glass fiber was purchased from Taishan Glass Fiber Co., Ltd., with the brand name CTG AR Cem-FIL ® 5325-2400.
[0056] Comparative Example 1
[0057] This embodiment provides a glass fiber reinforcement bar with an outer diameter of 16 mm, which is composed of a plurality of single-filament alkali-free glass fibers arranged in the same direction and gathered into an alkali-free glass fiber bundle. The alkali-free glass fiber bundle is the glass fiber reinforcement bar;
[0058] The alkali-free glass fiber was purchased from Pure Taishan Glass Fiber Co., Ltd. with the brand name CTG EDR480-T910.
[0059] Comparative Example 2
[0060] This embodiment provides a glass fiber reinforcement bar with an outer diameter of 16 mm. The glass fiber reinforcement bar is formed by arranging a plurality of single-filament alkali-resistant glass fibers in the same direction to form a bundle of alkali-resistant glass fibers. The alkali-resistant glass fiber bundle serves as the glass fiber reinforcement bar.
[0061] Alkali-resistant glass fiber was purchased from: Pure Taishan Glass Fiber Co., Ltd., brand CTG AR Cem-FIL ® 5325-2400.
[0062] Comparative Example 3
[0063] The difference from Example 1 is that the cross-sectional area ratio of the outer protective layer is adjusted to 20%, the cross-sectional area ratio of the middle transition layer remains unchanged, and the cross-sectional area ratio of the inner load-bearing core is adjusted to 60%.
[0064] Comparative Example 4
[0065] The difference from Example 1 is that the alkali-free glass fiber with the brand CTG EDR240-T910 produced by Taishan Glass Fiber Co., Ltd. is replaced by the alkali-free glass fiber with the brand CPICECT469L-2400 produced by Chongqing International Composite Materials Co., Ltd.
[0066] Comparative Example 5
[0067] The difference from Example 1 is that the alkali-resistant glass fiber with the brand AR C13-2700H produced by Huierjie New Materials Technology Co., Ltd. is used to replace the CTG AR Cem-FIL produced by Taishan Glass Fiber Co., Ltd. ® 5325-2400 alkali-resistant glass fiber.
[0068] In order to clarify the comprehensive performance of the glass fiber reinforced bars prepared in the examples and comparative examples, their mechanical properties and alkali resistance were quantitatively evaluated, and the specific test results are shown in Table 2.
[0069] Table 2. Performance parameters of glass fiber reinforced bars
[0070]
[0071] According to the data comparison in Table 2, the following conclusions can be drawn:
[0072] The comparative analysis of the experimental data of Example 1 and Comparative Examples 1 to 3 shows that:
[0073] The glass fiber reinforcement in Comparative Example 1, made exclusively of alkali-free glass fiber, exhibited the best mechanical properties (such as tensile strength and elastic modulus) but the worst alkali resistance (such as strength retention after immersion in an alkaline solution). The glass fiber reinforcement in Comparative Example 2, made exclusively of alkali-resistant glass fiber, achieved the best alkali resistance but significantly reduced mechanical properties. This result demonstrates that the introduction of alkali-resistant glass fiber effectively improves the alkali resistance of glass fiber reinforcement, but also leads to a decrease in mechanical properties. Comparative Example 3 further validates this trend: by increasing the amount of alkali-resistant glass fiber in the outer protective layer, compared to Example 3, the alkali resistance indicators improved while the mechanical properties showed a downward trend.
[0074] Comparison of the experimental data of Example 1 and Comparative Examples 4-5 shows that:
[0075] In Comparative Example 4, after replacing the alkali-free glass fiber with CPICECT469L-2400 alkali-free glass fiber produced by Chongqing International Composite Materials Co., Ltd., the mechanical properties and alkali resistance indicators of the glass fiber reinforced bar were lower than those of Example 1. In Comparative Example 5, after replacing the alkali-resistant glass fiber with AR C13-2700H alkali-resistant glass fiber produced by Huierjie New Materials Technology Co., Ltd., the mechanical properties and alkali resistance of the glass fiber reinforced bar were also lower than those of Example 1. These results confirm that the glass fiber reinforced bar prepared by composite of specific alkali-resistant glass fiber and alkali-free glass fiber in Example 1 has significant advantages in the synergistic optimization of mechanical properties and alkali resistance, and can achieve a balanced improvement in both performance indicators.
[0076] The above are only preferred embodiments of the present application and are not intended to limit the present invention. Although the present application has been described in detail with reference to examples, those skilled in the art can still modify the technical solutions described in the aforementioned examples or make equivalent replacements for some of the technical features therein. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.
Claims
1. A glass fiber reinforced bar, characterized in that: The glass fiber reinforced bar consists of a three-layer composite structure, which is composed of an inner load-bearing core, a middle transition layer and an outer protective layer from the inside to the outside. The inner layer load-bearing core is formed by high elastic modulus glass fibers arranged in the same direction along the axial direction of the glass fiber reinforcement ribs, and the high elastic modulus glass fibers include at least one of alkali-free glass fibers and ECR glass fibers; The intermediate transition layer is coated on the outer surface of the inner load-bearing core and is constructed by mixing high elastic modulus glass fiber and alkali-resistant glass fiber; The outer protective layer is coated on the outer surface of the middle transition layer and is made of alkali-resistant glass fiber.
2. The glass fiber reinforced bar according to claim 1, characterized in that: In the intermediate transition layer, the high elastic modulus glass fibers and the alkali-resistant glass fibers are alternately arranged in the same direction along the axial direction of the glass fiber reinforced ribs.
3. The glass fiber reinforced bar according to claim 1, wherein: The alkali-resistant glass fibers of the outer protective layer are arranged in the same direction along the axial direction of the glass fiber reinforced ribs.
4. The glass fiber reinforced bar according to claim 1, wherein: The cross-sectional area of the inner layer load-bearing core accounts for 50% to 70% of the total cross-sectional area of the glass fiber reinforced ribs; The cross-sectional area of the intermediate transition layer accounts for 20% to 30% of the total cross-sectional area of the glass fiber reinforced bar; The cross-sectional area of the outer protective layer accounts for 10% to 20% of the total cross-sectional area of the glass fiber reinforced bar.
5. The glass fiber reinforced bar according to claim 1, wherein: In the intermediate transition layer, the cross-sectional area ratio of the high elastic modulus glass fiber to the alkali-resistant glass fiber is (1-2): (1-2).
6. The glass fiber reinforced bar according to claim 1, characterized in that: The intermediate transition layer comprises at least two glass fiber monofilament layers, wherein the glass fiber monofilament layers are composed of high elastic modulus glass fiber monofilaments and alkali-resistant glass fiber monofilaments arranged alternately; The high elastic modulus glass fiber monofilaments and the alkali-resistant glass fiber monofilaments of adjacent glass fiber monofilament layers are arranged alternately.
7. The glass fiber reinforced bar according to claim 1, characterized in that: Calculated by mass percentage, the components of the high elastic modulus glass fiber include: 52% to 62% silicon oxide, 9% to 15% aluminum oxide, and 16% to 25% calcium oxide.
8. The glass fiber reinforced bar according to claim 1, characterized in that: Calculated by mass percentage, the components of the alkali-resistant glass fiber include: 1% to 18% zirconium oxide.
9. A concrete structural member, characterized in that: The invention comprises the glass fiber reinforced bar according to any one of claims 1 to 8.
10. Use of the glass fiber reinforced bar according to any one of claims 1 to 8 or the concrete structural member according to claim 9, characterized in that: Applicable to strong alkaline corrosive environment.