A G-UHPC board through-hole damage repair and reinforcement structure
By using G-UHPC slurry with a homologous formulation for repair on G-UHPC boards and combining it with fiber-reinforced fabric, polyurea coating, or concrete canvas reinforcement, the problems of insufficient adaptability and interface failure of traditional reinforcement technologies are solved, achieving efficient, green, and low-carbon repair and reinforcement effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU UNIVERSITY
- Filing Date
- 2025-08-06
- Publication Date
- 2026-06-30
AI Technical Summary
Existing reinforcement technologies are difficult to achieve precise and efficient reinforcement for different plate thicknesses, different damage ranges and different impact conditions, and have insufficient adaptability and interface failure risks. Traditional G-UHPC production has high energy consumption and is not conducive to green and low-carbon development.
The pores are sealed by G-UHPC slurry with the same formula as the original substrate, and fiber-reinforced cloth, polyurea coating or concrete canvas are selected as reinforcement layers according to the difference in plate thickness. Combined with the high homogeneity and self-healing ability of G-UHPC, the repair and reinforcement are integrated.
It achieves continuous matching of mechanical properties between the repaired area and the parent material, eliminates the risk of interface delamination, simplifies and simplifies construction, reduces maintenance costs, and improves impact resistance and durability.
Smart Images
Figure CN224432091U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building material repair and structural reinforcement technology, and in particular to a G-UHPC board through-through damage repair and reinforcement structure. Background Technology
[0002] During their service life, engineering structures inevitably suffer from the combined effects of various adverse factors due to their long-term exposure to complex service environments, including high-intensity impacts, freeze-thaw cycles, chemical corrosion, carbonization, and fatigue loads. These factors often induce various forms of damage, such as cracks, spalling, and perforation, both internally and on the surface of the structure. If such damage is not repaired and reinforced in a timely and effective manner, it will not only significantly weaken the structure's load-bearing capacity, stiffness, and durability, but may also endanger public safety, reduce the structural functionality, and even trigger serious secondary disasters, resulting in huge economic losses and social impacts. Therefore, developing efficient and reliable structural repair and reinforcement technologies has always been an important direction in the field of engineering protection.
[0003] Ultra-high performance concrete (G-UHPC), as a novel high-performance engineering material, has been widely used in bridges, tunnels, and protective engineering due to its ultra-high strength, high toughness, and excellent durability. Especially in protective structures, G-UHPC can maintain the overall stiffness and shape of the structure well under extreme conditions such as high-speed projectile impacts and explosive loads. However, traditional G-UHPC mainly uses Portland cement as a binder, and its production process involves high energy consumption and carbon dioxide emissions, which is not conducive to achieving green and low-carbon development goals. Meanwhile, repaired structures often still require reinforcement to further improve their overall load-bearing capacity, protective performance, and resistance to secondary impacts to meet higher service requirements. Current research and patents have proposed various reinforcement methods for strengthening damaged structures, such as fiber composite materials, polyurea coatings, and cement-based composite panels. However, existing reinforcement technologies generally suffer from insufficient adaptability, limited solutions, and high risk of interface failure. They are difficult to implement precise and efficient reinforcement for different plate thicknesses, damage ranges, and impact conditions, and lack systematic optimization research on reinforcement structures and material configurations. Therefore, there is an urgent need for a comprehensive repair and reinforcement solution that can flexibly integrate various reinforcement methods, adapt to different engineering needs, and possess green and low-carbon advantages. Utility Model Content
[0004] The purpose of this invention is to provide a structure for repairing and reinforcing G-UHPC board through-hole damage. Combining the high homogeneity and self-healing ability of G-UHPC with the thickness-graded reinforcement method, the structure uses G-UHPC slurry with the same formulation as the original substrate to seal the penetration pores. Depending on the thickness difference, it can be adapted to fiber-reinforced fabric, polyurea coating or concrete canvas reinforcement mode to achieve efficient repair, flexible reinforcement and green low-carbon protection, while improving impact resistance.
[0005] To achieve the above objectives, this utility model provides a G-UHPC board through-through damage repair and reinforcement structure, including a damaged G-UHPC board, a homogeneous repair layer filled inside the damaged G-UHPC board, and a reinforcement layer laid on the surface of the homogeneous repair layer.
[0006] The reinforcing layer is one of concrete canvas, fiber-reinforced fabric, or polyurea coating.
[0007] Preferably, the damaged G-UHPC board has dimensions of 400mm × 400mm and a thickness of 50mm-150mm.
[0008] Preferably, when the thickness of the damaged G-UHPC board is 50mm, no reinforcement is required;
[0009] When the thickness of the damaged G-UHPC board is 50mm-75mm, the reinforcement layer is concrete canvas;
[0010] When the thickness of the damaged G-UHPC board is 75mm-100mm, the reinforcement layer is fiber-reinforced fabric;
[0011] When the thickness of the damaged G-UHPC board is 100mm-150mm, the reinforcement layer is a polyurea coating.
[0012] Preferably, when the reinforcing layer is a concrete canvas, the concrete canvas absorbs water, expands, and solidifies into a 14mm reinforcing layer.
[0013] When the reinforcing layer is a fiber-reinforced fabric, a 0.1 mm thick adhesive layer is provided between the fiber-reinforced fabric and the repair layer;
[0014] When the reinforcing layer is a polyurea coating, the thickness of the polyurea coating is 3 mm.
[0015] Preferably, the adhesive layer is a polyurea adhesive layer or a polyurethane adhesive layer.
[0016] Preferably, the fiber-reinforced fabric is BFRP or CFRP.
[0017] Preferably, the fiber-reinforced fabric is a single layer or multiple layers.
[0018] Geopolymer ultra-high performance concrete (G-UHPC), as a novel green high-performance material, boasts advantages such as low carbon footprint, environmental friendliness, low energy consumption, and excellent mechanical properties due to its use of industrial by-products as the main cementitious component. This makes it an ideal material for repairing through-hole damage in G-UHPC panels. By using G-UHPC slurry containing 1.5% steel fiber as the repair filler, high homogeneity and good interface matching between the repair layer and the original structural matrix can be achieved, restoring the continuity of the damaged area, transferring stress, and ensuring the overall structural integrity.
[0019] Applying a layer of material with excellent mechanical properties (concrete canvas, fiber-reinforced fabric, or polyurea coating) to the surface of the repair layer can distribute the load borne by the repair layer and the surrounding original slab. It can also limit the lateral deformation of the repair layer and the surrounding concrete, such as cracking, thereby improving their compressive and shear capacity. Simultaneously, it connects the repaired area to a larger undamaged area, improving the overall stiffness and ductility of the structure; furthermore, it can serve as a protective layer, enhancing the durability of the repaired area, such as its resistance to impermeability, erosion, and impact.
[0020] The variation in thickness of G-UHPC sheets leads to differences in their stiffness, load-bearing capacity, and post-damage stress state. Therefore, reinforcement layers with different performance characteristics are required.
[0021] For 50mm thin slabs, the stiffness is low. The G-UHPC used for homogeneous repair is already strong enough, and additional reinforcement layers may introduce new interface problems due to an excessively high stiffness / thickness ratio. For medium-thin slabs (0-75mm), concrete canvas is used. After water absorption and curing, the concrete canvas forms a cement-based composite material layer with a certain thickness and stiffness. It can provide moderate reinforcement and good restraint, with relatively low cost and convenient construction (direct laying and watering). For medium-thick slabs (75-100mm), fiber-reinforced fabric is used. The fiber fabric has extremely high tensile strength and elastic modulus, which can effectively bear tensile stress and significantly improve the slab's bending and tensile bearing capacity and stiffness. The bonding layer can ensure effective stress transfer between the fiber fabric and the repair layer matrix. For 100-150mm thick slabs, polyurea coating is used. Polyurea has extremely high toughness, elongation, impact resistance, and excellent waterproof sealing properties. For thicker plates, which have greater rigidity, stress concentration is relatively mild after damage, but they may face greater deformation and potential risks of microcrack propagation. Therefore, the high ductility of the polyurea coating formed by multiple sprayings can bridge microcracks that may appear in the repair layer or substrate, delaying their propagation. At the same time, it can form a seamless, highly elastic waterproof and anti-corrosion barrier, greatly improving durability.
[0022] Therefore, the present invention employs the above-mentioned G-UHPC board through-hole damage repair and reinforcement structure, which has the following beneficial effects:
[0023] (1) The repair area is consistent with the parent body to ensure continuous matching of mechanical properties and eliminate the risk of interface peeling;
[0024] (2) For different plate thicknesses and damage levels, fiber-reinforced fabric, polyurea coating and concrete canvas are selected for reinforcement to achieve precise reinforcement.
[0025] (3) The construction process is simple and efficient, and the repair and reinforcement are completed in one step, which greatly reduces the maintenance cost and is suitable for impact damage protection scenarios.
[0026] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the structure of the G-UHPC board before and after the repair and reinforcement of through-hole damage in Example 1;
[0028] Figure 2 This is a schematic diagram of the structure of the G-UHPC board before and after the repair and reinforcement of through-hole damage in Example 2;
[0029] Figure 3 This is a schematic diagram of the structure of the G-UHPC board before and after the repair and reinforcement of through-hole damage in Example 3;
[0030] Figure 4 This is a schematic diagram of the structure of the G-UHPC board before and after the repair and reinforcement of through-hole damage in Example 4;
[0031] Figure 5 This is a schematic diagram of the structure of the G-UHPC board before and after the repair and reinforcement of through-hole damage in Example 5;
[0032] Figure Labels
[0033] 1. 50mm damaged G-UHPC board; 2. Homogeneous repair layer; 3. 75mm damaged G-UHPC board; 4. Concrete canvas reinforcement layer; 5. 100mm damaged G-UHPC board; 6. BFRP fiber reinforced fabric reinforcement layer; 7. CFRP fiber reinforced fabric reinforcement layer; 8. 150mm damaged G-UHPC board; 9. Polyurea coating reinforcement layer. Detailed Implementation
[0034] This invention provides a structure for repairing and reinforcing G-UHPC board with through-hole damage, comprising a damaged G-UHPC board, a homogeneous repair layer filling the interior of the damaged G-UHPC board, and a reinforcing layer laid on the surface of the homogeneous repair layer; the repair layer is a G-UHPC slurry containing 1.5% steel fiber, and the reinforcing layer is one of concrete canvas, fiber-reinforced fabric, or polyurea coating. The damaged G-UHPC board has dimensions of 400mm × 400mm and a thickness of 50mm-150mm, and each specimen incorporates 1.5% steel fiber by volume.
[0035] During the damage repair stage, the holes and surrounding loose debris formed by the high-speed projectile penetration are first cleaned to keep the interface dry. Then, G-UHPC repair slurry containing 1.5% steel fiber by volume is injected. The slurry ratio is consistent with the original substrate material. After vibration compaction and leveling, curing and solidification are performed to achieve homogeneous sealing between the repaired area and the original substrate. Further, the repaired G-UHPC board is reinforced in a multi-mode stage: depending on the board thickness and the degree of damage, the following reinforcement methods are selected: (1) For 50mm thick boards, only the raw materials are repaired and no additional reinforcement materials are added; (2) For 50mm-75mm thick boards, concrete canvas is used for reinforcement: the pre-coated concrete canvas is covered on the repair surface, and it absorbs water and expands to solidify into a 14mm reinforcement layer; (3) For 75mm-100mm thick boards, fiber reinforced cloth is used for reinforcement: BFRP or CFRP cloth is laid in single or multiple layers and coupled to the substrate interface through a 0.1mm thick polyurea adhesive; (4) For 100mm-150mm thick boards, polyurea coating is used for reinforcement: a protective film with a total thickness of about 3mm is formed by spraying in multiple times.
[0036] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.
[0037] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0038] The specific connection methods of each part all adopt conventional methods such as bolts, rivets, and welding that are mature in existing technology. The machinery, parts and equipment all adopt conventional models in existing technology. In addition, the circuit connection adopts conventional connection methods in existing technology, which will not be described in detail here.
[0039] The damaged G-UHPC boards used in the following examples are 400mm×400mm in size, with thicknesses of 50mm, 75mm, 100mm and 150mm respectively. Each damaged specimen contains 1.5% steel fiber by volume.
[0040] Example 1
[0041] like Figure 1 As shown, this embodiment provides a G-UHPC board through-damage repair and reinforcement structure, including a 50mm damaged G-UHPC board 1 and a homogeneous repair layer 2 filled inside the damaged G-UHPC board.
[0042] The damaged G-UHPC board was repaired using original materials. The repair process is as follows:
[0043] (1) Damage cleaning: After the penetration test, the loose debris on the surface of the G-UHPC board and around the pores is thoroughly cleaned to ensure that the repair interface is free of dust and loose soil and remains dry and firm.
[0044] (2) Preparation of repair slurry: The repair slurry is prepared strictly according to the original G-UHPC ratio. After stirring evenly, 1.5% of the total slurry volume of steel fiber is added to enhance the tensile toughness of the repair area.
[0045] (3) Injection and leveling: Slowly inject the well-mixed repair slurry into the penetration channels and pits, with the injection volume slightly higher than the original plate surface, to ensure no air bubbles and voids; before the slurry initially sets, use a scraper or vibrator to level the surface.
[0046] (4) Curing and solidification: After initial setting, a special curing film is laid to prevent moisture evaporation and cured at room temperature until the designed strength is reached to form a repair layer and complete the self-repair process.
[0047] Example 2
[0048] like Figure 2 As shown, this embodiment provides a G-UHPC board through-damage repair and reinforcement structure, including a 75mm damaged G-UHPC board 3, a homogeneous repair layer and a concrete canvas reinforcement layer 4 filled inside the damaged G-UHPC board.
[0049] The damaged G-UHPC board was repaired using the original materials. The repair process was the same as in Example 1 and will not be repeated here.
[0050] To reinforce the repaired G-UHPC board, a pre-coated concrete canvas was laid on the repair surface, and 3.2 kg of clean water was poured in to allow the concrete canvas to fully absorb water, expand, and bond with the substrate. After natural air drying, a 14 mm reinforcement layer was formed.
[0051] Example 3
[0052] like Figure 3 As shown, this embodiment provides a G-UHPC board through-damage repair and reinforcement structure, including a 100mm damaged G-UHPC board 5, a homogeneous repair layer and a BFRP fiber reinforced fabric reinforcement layer 6 filled inside the damaged G-UHPC board.
[0053] The damaged G-UHPC board was repaired using the original materials. The repair process was the same as in Example 1 and will not be repeated here.
[0054] The repaired G-UHPC board was reinforced by fully wrapping the board surface with a single layer of 3mm thick BFRP fiber cloth, with two layers laid in total. A 0.1mm thick polyurea adhesive layer was evenly applied between the fiber cloth and the substrate. At the same time, the sides were fixed with high-strength adhesive tape to prevent cracking caused by the tensile expansion of the fiber cloth.
[0055] Example 4
[0056] like Figure 4 As shown, this embodiment provides a G-UHPC board through-damage repair and reinforcement structure, including a 100mm damaged G-UHPC board, a homogeneous repair layer and a CFRP fiber reinforced fabric reinforcement layer 7 filled inside the damaged G-UHPC board.
[0057] The damaged G-UHPC board was repaired using the original materials. The repair process was the same as in Example 1 and will not be repeated here.
[0058] The repaired G-UHPC board was reinforced by fully wrapping it with CFRP fiber cloth, with a single layer thickness of 0.17mm and a total of 18 layers. Similarly, a 0.1mm thick polyurea was applied between each layer as an adhesive, and the sides were secured with tape. The final reinforcement layer thickness was 3mm.
[0059] Example 5
[0060] like Figure 5 As shown, this embodiment provides a G-UHPC board through-damage repair and reinforcement structure, including a 150mm damaged G-UHPC board 8 and a homogeneous repair layer and a polyurea coating reinforcement layer 9 filled inside the damaged G-UHPC board.
[0061] The damaged G-UHPC board was repaired using the original materials. The repair process was the same as in Example 1 and will not be repeated here.
[0062] The repaired G-UHPC board was reinforced by spraying polyurea. The coating was applied in three coats, and the thickness of each coat was measured to be about 1 mm after each coat was air-dried. The total thickness of the polyurea coating reinforcement layer was 3 mm.
[0063] The performance of the G-UHPC board through-through damage repair and reinforcement structures prepared in Examples 1-5 was verified. The verification test methods are as follows:
[0064] Ultimate bending capacity test: The ultimate bearing capacity at the point of structural failure was recorded by a four-point bending test with a loading rate of 2 mm / min.
[0065] Impact resistance test: The center of the structure was impacted by a high-speed projectile with a diameter of 10mm and a velocity of 300m / s, and the energy required to resist penetration was recorded (unit: kJ).
[0066] Interfacial bond strength test: The interfacial bond strength between the repair layer and the original board, and between the reinforcement layer and the repair layer was tested using the pull-out method (unit: MPa).
[0067] Impermeability test: In accordance with the "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete", a 72-hour seepage test was conducted, and the seepage height (unit: mm) was recorded.
[0068] The test results are shown in Table 1.
[0069] Table 1 Test Results
[0070]
[0071]
[0072] As shown in Table 1, the ultimate bending bearing capacity of the repaired structures in each embodiment recovered to more than 92% of the original plate performance. Among them, the improvement in Embodiment 4, which was reinforced with CFRP fiber cloth, was the most significant, indicating that fiber-reinforced materials have high tensile strength. The impact penetration energy resistance gradually increased with the optimization of the reinforcement method. The polyurea coating in Embodiment 5 had the best effect due to its high toughness and could withstand higher impact energy without penetration. The interfacial bonding strength met the engineering requirements (≥3MPa). The fiber-reinforced cloth achieved higher interfacial synergy through the polyurea bonding layer. The impermeability improved with the improvement of the sealing of the reinforcement layer. The polyurea coating in Embodiment 5 had the lowest water penetration height, indicating that it had the best waterproof sealing performance.
[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.
Claims
1. A structure for repairing and reinforcing G-UHPC board through-hole damage, characterized in that: Includes a damaged G-UHPC board, a homogeneous repair layer filled inside the damaged G-UHPC board, and a reinforcing layer laid on the surface of the homogeneous repair layer; The reinforcing layer is one of concrete canvas, fiber-reinforced fabric, or polyurea coating.
2. The G-UHPC board through-hole damage repair and reinforcement structure according to claim 1, characterized in that: The damaged G-UHPC board has dimensions of 400mm × 400mm and a thickness of 50mm-150mm.
3. The G-UHPC board through-hole damage repair and reinforcement structure according to claim 2, characterized in that: When the thickness of the damaged G-UHPC board is 50mm, no reinforcement layer is required; When the thickness of the damaged G-UHPC board is 50mm-75mm, the reinforcement layer is concrete canvas; When the thickness of the damaged G-UHPC board is 75mm-100mm, the reinforcement layer is fiber-reinforced fabric; When the thickness of the damaged G-UHPC board is 100mm-150mm, the reinforcement layer is a polyurea coating.
4. The G-UHPC board through-hole damage repair and reinforcement structure according to claim 3, characterized in that: When the reinforcement layer is a concrete canvas, the concrete canvas absorbs water, expands, and solidifies into a 14mm reinforcement layer. When the reinforcement layer is a fiber-reinforced fabric, a 0.1 mm thick adhesive layer is provided between the fiber-reinforced fabric and the homogeneous repair layer; When the reinforcing layer is a polyurea coating, the thickness of the polyurea coating is 3 mm.
5. The G-UHPC board through-hole damage repair and reinforcement structure according to claim 4, characterized in that: The adhesive layer is a polyurea adhesive layer or a polyurethane adhesive layer.
6. The G-UHPC board through-hole damage repair and reinforcement structure according to claim 5, characterized in that: The fiber-reinforced fabric is BFRP or CFRP.
7. The G-UHPC board through-hole damage repair and reinforcement structure according to claim 6, characterized in that: The fiber-reinforced fabric can be a single layer or multiple layers.