High strength composite cement blanket

Abstract

The application discloses high-strength composite cement blanket and belongs to the technical field of civil engineering composite materials. The application improves the three-dimensional fabric structure: a three-dimensional weaving is adopted to form a top layer, a middle layer and a bottom layer, wherein the middle layer is formed by a honeycomb three-dimensional structure formed by interweaving vertical fiber filaments and horizontal oblique fiber filaments which are arranged obliquely relative to the vertical fiber filaments; the vertical fiber filaments connect the top layer and the bottom layer; and the horizontal oblique fiber filaments pass through the vertical fiber filaments in an S-shaped wiring mode multiple times to form limiting knots which are distributed in the top layer, the middle layer and the bottom layer to form an overall tensile strength reinforcing structure. The three-dimensional fabric can be combined with a "two cloth and one film" protective layer and a solidifiable composite material containing gold steel sand. The application realizes isotropic reinforcement through the honeycomb structure and builds a mechanical occlusal interface through the S-shaped limiting structure, thereby significantly improving the bending strength, interface adhesion and waterproof durability of the cement blanket, and the application is suitable for slope protection, trench lining and temporary road paving engineering and the like.

Description

Technical Field

[0001] This invention relates to the field of composite materials technology for civil engineering, specifically to a high-strength composite cement blanket, and more particularly to a high-strength composite cement blanket that can be used for slope protection, ditch lining, and temporary road paving. Background Technology

[0002] Cement blankets, also known as concrete canvas, are flexible fiber fabric rolls impregnated with cement-based composite materials. When used, they are simply cut and laid on the construction site. After being moistened with water, the cement hydration reaction hardens the flexible blanket into a rigid concrete slab. Combining the flexibility of textiles with the rigidity of concrete, they offer significant advantages such as convenient construction, short construction period, and low transportation costs.

[0003] In existing technologies, the structures of cement blankets are mainly classified into the following categories:

[0004] (1) Single-layer membrane-short fiber composite structure

[0005] This type of cement blanket uses a single-layer geomembrane or plastic film as the base material, with a surface composite of chopped fiber mesh or non-woven fabric, and is filled with cement mortar. While the process is simple, this type of structure has significant technical drawbacks: the fibers are in a disordered, short-cut state, failing to form an effective support skeleton; the cement becomes brittle after curing, exhibiting poor flexural strength and easily developing micro-cracks during handling and laying; and the single-layer membrane has limited impermeability, making it prone to powder loss and oxidative deterioration under long-term immersion conditions.

[0006] (2) Two-dimensional mesh fabric structure

[0007] Some improved solutions employ warp-knitting or weft-knitting processes to prepare two-dimensional mesh fabrics as a skeleton, which are then sandwiched between upper and lower non-woven fabrics to form a composite. While this structure is an improvement over single-layer membranes, the fibers can only provide constraint in the plane, lacking effective connection in the thickness direction. Under bending conditions, the upper and lower surfaces are prone to delamination, and the interlayer shear strength is insufficient; furthermore, the mesh size of the two-dimensional mesh is relatively large, limiting its constraint on the cement matrix, and shrinkage cracks are easily generated after curing.

[0008] (3) Three-dimensional fabric structure

[0009] To further improve the overall structural integrity, existing technologies have developed three-dimensional fabrics as the skeleton of cement blankets, forming a three-dimensional mesh structure through the interweaving of warp, weft, and vertical (Z-direction) fibers. However, existing three-dimensional fabrics mostly use vertical fibers (Z-direction fibers) to simply puncture and connect the upper and lower surfaces, resulting in point contact between fibers and a lack of effective mechanical interlocking. During cement curing, the interface between the fiber and the cement matrix is ​​only physically adhered, and interface slippage easily occurs under external loads, leading to low fiber reinforcement efficiency. In addition, the rigid connection of vertical fibers reduces the flexibility of the fabric, and the Z-direction fibers are prone to bending and breakage when rolled, affecting construction performance.

[0010] On the other hand, traditional cement blankets mostly use ordinary manufactured sand as aggregate, which has limited particle hardness and low material density after curing; the surface protection mostly uses a single layer of polyethylene film, which has poor puncture resistance and is easily punctured by sharp objects during the laying process, leading to waterproofing failure and internal cement pre-hydration due to moisture.

[0011] In summary, existing cement blanket technologies have the following main drawbacks:

[0012] (1) Structural mechanical defects: The existing three-dimensional fabrics have a single fiber orientation (mainly vertical orientation), which cannot form a multi-directional stress transmission network; the fiber nodes lack effective locking, and the fibers are easily pulled out under the action of external force; the upper and lower surface layers and the middle layer are only connected by vertical fibers, resulting in low interlayer peel strength, poor folding resistance, and easy "delamination" damage after curing.

[0013] (2) Interface bonding defects: Traditional fabrics and cement matrices are bonded only by surface friction and cement paste adhesion, lacking mechanical interlocking; under wet-dry cycles or freeze-thaw environments, the interfacial bonding force decays rapidly, causing the fiber and matrix to not deform synchronously, and the reinforcement effect decreases significantly over time.

[0014] (3) Waterproof sealing defects: The waterproof barrier of single-layer membrane structure or simple composite membrane structure is incomplete, and water seepage channels are easily formed at the joints and punctures; cement powder leaks through the fiber gaps in a humid environment, which not only causes material loss, but also leads to oxidation and corrosion of internal steel bars or fiber mesh, resulting in insufficient durability.

[0015] (4) Material density defects: Ordinary manufactured sand aggregate has low hardness and few edges, making it difficult to form a high density skeleton; the surface protective layer has weak puncture resistance and is easily damaged during construction, leading to the exposure and failure of the internal cement.

[0016] Therefore, there is an urgent need to develop a new type of high-strength composite cement blanket, and to solve the technical bottlenecks in mechanical properties, interface bonding, waterproof sealing and durability through synergistic innovation in structure, process and materials. Summary of the Invention

[0017] The present invention aims to at least partially solve one of the technical problems existing in the related art.

[0018] The purpose of this invention is to provide a high-strength composite cement blanket. By improving the internal fiber arrangement structure of the three-dimensional fabric, the mechanical interlocking between the fiber skeleton and the cement matrix is ​​enhanced without sacrificing the flexibility of the material, thereby significantly improving the overall strength and flexural toughness of the cement blanket after curing.

[0019] To achieve the above objectives, the present invention provides a high-strength composite cement blanket, comprising a protective layer, a three-dimensional fabric structure, and a curable composite material filled in the mesh of the three-dimensional fabric structure. The three-dimensional fabric includes a top layer, a middle layer, and a bottom layer. The top layer is mesh-like, and the bottom layer is bonded to the protective layer and supports the curable composite material.

[0020] The middle layer of the three-dimensional fabric is a honeycomb-like three-dimensional structure formed by interlacing vertical fiber filaments and transversely inclined fiber filaments that are inclined relative to the vertical fiber filaments; the vertical fiber filaments penetrate the middle layer along the thickness direction and connect the top layer and the bottom layer;

[0021] The transverse diagonal fiber filaments pass through several vertical fiber filaments in an S-shaped pattern, forming a limiting knot distributed on the top, middle and bottom layers of the three-dimensional fabric structure. The limiting knot mechanically locks the transverse diagonal fiber filaments and the vertical fiber filaments to form an overall tensile-strength-enhancing structure. Furthermore, the transverse diagonal fiber filaments and the vertical fiber filaments intertwine with each limiting knot to form a honeycomb-shaped three-dimensional structure corresponding to the grid of the top layer.

[0022] A further preferred embodiment of the present invention is that the inclination angle of the transversely drawn fiber relative to the vertical fiber is 45°;

[0023] The gap between two adjacent transversely drawn diagonal fibers is 1 mm to 3 mm;

[0024] The number of transversely drawn fibers in each square meter of intermediate layer is at least 500.

[0025] Preferably, the three-dimensional fabric has 18,000 to 20,000 mesh openings per square meter, the mesh openings being formed by the interlacing of the vertical fiber filaments and the transverse oblique fiber filaments and arranged in a hexagonal or near-hexagonal shape to form the honeycomb three-dimensional structure;

[0026] Each of the mesh openings is provided with a vertical support wire, which is part of the vertical fiber filament. The vertical support wire extends from the top of the current mesh opening to the bottom of the adjacent mesh opening, forming a spider web-like tension transmission network.

[0027] Preferably, each mesh opening is provided with two vertical support wires, which are arranged crosswise or parallel.

[0028] The total number of vertical support filaments in the three-dimensional fabric per square meter is approximately 35,000.

[0029] Preferably, the limiting knot is a tangled knot formed by the transversely diagonally drawn fiber filament continuously winding multiple vertical fiber filaments in an S-shape;

[0030] The limiting knot forms the main tensile node in the intermediate layer to bear bending stress, and forms a surface locking structure in the top and bottom layers to prevent edge fiber pull-out.

[0031] Preferably, the mesh size of the top layer is 200 to 300 meshes;

[0032] The fiber diameters of the top and bottom layers are both larger than those of the intermediate layer, forming a gradient structure of a surface constraint layer and an internal flexible reinforcement layer.

[0033] Preferably, the intermediate layer is further embedded with a glass fiber mesh layer, which is fixed by the limiting knot;

[0034] The edges of the glass fiber mesh extend to the outer regions of the top layer and the bottom layer, forming an overall encapsulated and reinforced structure.

[0035] Preferably, the bottom layer of the three-dimensional fabric structure is bonded to the protective layer with hot melt adhesive.

[0036] The protective layer is a composite structure consisting of a first PET spunlace nonwoven fabric, a PE waterproof membrane, and a second PET spunlace nonwoven fabric stacked in sequence.

[0037] Preferably, the PET spunlace nonwoven fabric has a basis weight of 40 g / m² to 120 g / m², and the PE waterproof membrane has a thickness of 0.1 mm to 0.3 mm and a basis weight of 30 g / m².

[0038] The hot melt adhesive is EVA hot melt adhesive or TPU hot melt adhesive, and the coating amount is 125g / m² to 250g / m².

[0039] Preferably, the curable composite material includes a cement matrix and aggregates, wherein the aggregates contain diamond grit;

[0040] The diamond grit has a particle size of 0.1 mm to 2 mm. The diamond grit fills the mesh of the honeycomb three-dimensional structure and forms a mechanical interlock with the fiber filaments.

[0041] The high-strength composite cement blanket provided by this invention, through systematic innovation in its three-dimensional fabric structure, has the following significant technical advantages compared to existing technologies:

[0042] (1) This invention utilizes the geometric stability of the hexagonal mesh to create an isotropic stress transfer network in the horizontal plane by setting a honeycomb-like three-dimensional structure formed by interlacing vertical fiber filaments and 45° transverse diagonal fiber filaments in the intermediate layer. The honeycomb structure not only significantly enhances the toughness and ductility of the cement blanket after curing, but also effectively disperses external loads, greatly improving the overall flexural strength and crack resistance; at the same time, the regular mesh structure accelerates the penetration and fusion of cement paste, improving curing efficiency.

[0043] (2) This invention innovatively uses transversely inclined fiber filaments to pass through vertical fiber filaments multiple times in an S-shaped routing manner to form a limiting knot. This limiting knot is distributed in the top layer, middle layer and bottom layer, forming a three-dimensional mechanical locking network. This mechanical interlocking structure enables the fiber and cement matrix to be stressed and deformed synchronously, effectively preventing fiber pull-out and interlayer peeling, and greatly improving the interfacial bonding strength and structural integrity.

[0044] (3) In this invention, approximately 35,000 vertical fiber filaments (vertical support filaments) per square meter of three-dimensional fabric extend from the top of the mesh to the bottom of the adjacent mesh, forming a spider web-like tensile force transmission network together with the limiting knots distributed in the three layers. This structure provides strong Z-axis (thickness direction) support for the material, significantly enhancing the interlayer shear strength, and making the top, middle and bottom layers form a true integral stress-bearing structure rather than a simple stacked combination, effectively avoiding the "delamination" damage that is prone to occur in traditional cement blankets under bending conditions.

[0045] (4) The present invention uses a "sandwich" composite structure of PET spunlace nonwoven fabric / PE film / PET spunlace nonwoven fabric as a protective layer, which is reliably bonded to the three-dimensional fabric by hot melt adhesive to form a dense waterproof barrier. The outer nonwoven fabric provides excellent puncture resistance and abrasion resistance, while the middle PE film blocks the penetration channels of water vapor and oxygen, effectively preventing leakage of internal cement powder and oxidation deterioration in humid environments, and significantly improving the long-term stability of the product under complex working conditions.

[0046] (5) In this invention, high-hardness diamond grit is used to replace traditional manufactured sand and fill the mesh of the honeycomb three-dimensional structure. The hard edges of the diamond grit and the fiber filaments form multi-point mechanical interlocking. At the same time, with the help of the spatial constraint effect of the honeycomb mesh on the aggregate, a synergistic reinforcement system of "high-hardness aggregate-flexible fiber skeleton" is constructed. This synergistic effect of structure and material greatly improves the density of the product and increases the strength by more than 30% compared with traditional cement blankets, breaking through the performance bottleneck of traditional products.

[0047] (6) In the dry state, the cement blanket of the present invention maintains the flexibility to be rolled up, which is convenient for transportation and on-site laying; after curing when exposed to water, it is transformed into a rigid composite material with high strength, high toughness and high waterproofness through the synergistic effect of honeycomb structure, S-shaped limiting knot and diamond sand aggregate, which perfectly realizes the state conversion of "flexible transportation - rigid use" and is suitable for a variety of complex engineering scenarios such as slope protection, ditch lining, and temporary roads.

[0048] In summary, this application has achieved a systematic breakthrough in fiber arrangement, interface bonding, waterproof sealing and aggregate synergy through the innovative design of three-dimensional fabric structure. The high-strength composite cement blanket prepared has outstanding advantages such as excellent mechanical properties, reliable interface bonding, good waterproof durability and convenient construction. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the structure of the high-strength composite cement blanket of the present invention;

[0050] Figure 2 This is a side view of the high-strength composite cement blanket of the present invention. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, embodiments of this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. In the description of this invention, it should be understood that the terminology used is for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] The following is combined Figures 1-2 This invention describes the high-strength composite cement blanket provided by the present invention.

[0053] Example 1: This example provides a standard high-strength composite cement blanket.

[0054] 1. Preparation of three-dimensional fabric structures

[0055] Three-dimensional fabrics are prepared using a three-dimensional weaving process:

[0056] (1) Fiber material selection: High-strength polyester industrial filament (PET) is selected as the fiber raw material, with a single filament fineness of 1000D and a tensile strength ≥7.5cN / dtex. Among them, the fiber diameter used for the top and bottom layers is selected as 0.25mm, and the fiber diameter used for the middle layer is selected as 0.20mm, forming a diameter gradient.

[0057] (2) Threading process:

[0058] Vertical fibers: These fibers run vertically to connect the top and bottom layers of the three-dimensional fabric. The total number of vertical fibers in each square meter of three-dimensional fabric is approximately 35,000.

[0059] Horizontal diagonal fiber filaments: set at a 45° angle relative to vertical fiber filaments, interwoven with vertical fiber filaments in the middle layer, with 500 diagonal fiber filaments per square meter, arranged in a horizontal direction, and the gap between each pair of filaments controlled at 1mm-3mm;

[0060] Interlacing pattern: Vertical fibers and transverse diagonal fibers intertwine at the interlacing points to form a hexagonal honeycomb three-dimensional structure, creating approximately 18,000 mesh openings per square meter. Two vertical fibers (vertical support fibers) are placed in each mesh opening, arranged in a crisscross pattern, extending from the top of the current mesh opening to the bottom of the adjacent mesh opening.

[0061] (4) S-shaped limiting knot weaving: During the horizontal winding process, the transversely pulled fiber filament passes through 5 vertical fiber filaments in an S-shape and then turns back to form a winding knot (limiting knot). The limiting knot is distributed in the top layer, middle layer and bottom layer, among which the limiting knot in the middle layer bears the main tension, and the limiting knots in the top layer and bottom layer form surface locking.

[0062] (5) Glass fiber mesh layer implantation: Alkali-resistant glass fiber mesh cloth (weight 160g / m², mesh size 5mm×5mm) is implanted in the middle layer and fixed to the middle layer by limiting knots. The edge of the glass fiber mesh layer extends to the outer area of ​​the top and bottom layers.

[0063] The completed three-dimensional fabric has a top layer (250 mesh), a middle layer (honeycomb structure) and a bottom layer (250 mesh), with an overall thickness of 15 mm.

[0064] 2. Protective layer composite

[0065] (1) Protective layer material: The "two-layer fabric and one-layer film" composite structure is selected, and the layers from the outside to the inside are as follows:

[0066] First PET spunlace nonwoven fabric: weight 40g / m²;

[0067] PE waterproof membrane: 0.2mm thickness, 30g / m² weight;

[0068] Second PET spunlace nonwoven fabric: 60 g / m².

[0069] (2) Composite process: EVA hot melt adhesive (melt index 150g / 10min) is used as the adhesive. Hot melt adhesive is applied to the top and bottom surfaces of the three-dimensional fabric, with a coating amount of 30g / m². The protective layer is bonded to the three-dimensional fabric by hot pressing. The hot pressing temperature is 120℃, the pressure is 0.3MPa, and the holding time is 3 seconds, so that the protective layer and the three-dimensional fabric form an integral structure.

[0070] 3. Curable composite material filler

[0071] (1) Aggregate formulation:

[0072] Cement: Ordinary Portland cement (PO 52.5) ​​is selected.

[0073] Aggregate: silicon carbide, with a particle size of 0.1 mm to 2 mm, and the mass ratio of silicon carbide to cement is 46:53;

[0074] Additives: water-reducing agent (polycarboxylate, dosage 1.0% of cement mass), waterproofing agent (organosilicon, dosage 0.5% of cement mass).

[0075] (2) Filling method: The above dry mixture is evenly spread in the mesh of the three-dimensional fabric with a filling density of 15kg / m², so that the aggregate fully fills the mesh of the honeycomb three-dimensional structure and forms a mechanical interlock with the fiber filament.

[0076] 4. Performance Testing

[0077] The high-strength composite cement blanket prepared above was cut into 300mm×300mm samples, soaked in water (water-cement ratio 0.3), and its performance was tested after curing for 28 days.

[0078] Flexural strength: reaches 5.3 MPa, which is 76% higher than that of traditional single-layer cement blanket (about 3 MPa);

[0079] Compressive strength: up to 58 MPa;

[0080] Interlayer peel strength: reaches 1.8kN / m, while traditional cement blanket (point contact structure) is only 0.6kN / m;

[0081] Impermeability rating: P8 (no leakage under 0.8MPa water pressure);

[0082] Flexibility: When dry, it can be wound into a 500mm diameter roll without cracking.

[0083] Example 2: This example provides a high-density, high-strength composite cement blanket.

[0084] The difference from Example 1 lies in the optimization of fiber density and aggregate formulation:

[0085] 1. Adjustment of parameters for three-dimensional fabrics

[0086] The gap between the transversely diagonally drawn fibers (45°) is reduced to 2 mm;

[0087] The number of transversely drawn fibers per square meter has been increased to 600;

[0088] The mesh density was increased to 20,000 meshes / m²;

[0089] The S-shaped locking knot uses a dense weaving method to enhance the mechanical locking effect.

[0090] 2. Aggregate formulation optimization

[0091] The diamond grit particle size is graded: 30% is 0.5mm, 40% is 1mm, and 30% is 2mm, which improves the filling density.

[0092] The mass ratio of diamond grit to cement is 46:53;

[0093] Adding silica fume (at a dosage of 8% of the cement mass) improves the interfacial bond strength.

[0094] 3. Performance Testing

[0095] After 28 days of care:

[0096] The compressive strength reaches 58 MPa;

[0097] Density and porosity are less than 0.6%;

[0098] The wear resistance (wear loss) is reduced by 30% compared to Example 1, making it suitable for temporary roads with high traffic volume.

[0099] Example 3: This example provides a lightweight, high-strength, high-strength composite cement blanket.

[0100] The difference from Example 1 lies in the adjustment of the fiber material and protective structure:

[0101] 1. Optimization of fiber materials

[0102] High-strength, high-modulus polyethylene fiber (UHMWPE) is used to replace polyester fiber, while the fiber diameter remains unchanged, but the tensile strength is increased to 30 cN / dtex.

[0103] 2. Adjustment of protective layer

[0104] Only the top surface (top layer) is covered with a "two-layer fabric and one-layer film" protective layer, while the bottom layer retains only a single layer of PET non-woven fabric (120g / m²), thus reducing the overall weight.

[0105] The hot melt adhesive was changed to TPU hot melt adhesive to improve low-temperature toughness.

[0106] 3. Aggregate Adjustment

[0107] The diamond grit has a particle size of 1.5mm and a grit-to-grit ratio of 46:53.

[0108] Add lightweight ceramsite (at a dosage of 20% of the total aggregate) to reduce the overall density.

[0109] 4. Performance Testing

[0110] The areal density (uncured) was reduced to 12 kg / m² (18 kg / m² in Example 1).

[0111] The tensile strength (after curing) reaches 8MPa, which is 40% higher than that of traditional products;

[0112] Suitable for weight-sensitive engineering scenarios such as slope protection.

[0113] The advantages of the present invention are demonstrated through comparative experiments below, and the comparison results are shown in Table 1.

[0114] Comparative Example 1: Traditional unidirectional fiber cement blanket, which uses vertical fibers (Z direction) to connect the upper and lower layers of three-dimensional fabric, with point contact between fibers and no S-shaped limiting knots, and is filled with ordinary manufactured sand cement slurry.

[0115] Comparative Example 2: A cement blanket without a honeycomb structure, using an orthogonally woven two-dimensional mesh fabric as the skeleton, with the same filling material as in Example 1.

[0116] Table 1 Performance Comparison Table

[0117] Flexural strength (MPa) 5.3 2.0 3.2 Interlayer peel strength (kN / m) 1.8 0.6 0.9 Fiber pull-out force (N) 45 12 20 28-day shrinkage rate (%) 0.15 0.35 0.28

[0118] The above comparison shows that the present invention forms a stable honeycomb three-dimensional structure through fiber interweaving. With the mechanical advantages of the honeycomb structure, it significantly enhances the toughness and ductility of the cement blanket after curing, and improves the strength and structural stability of the cement blanket.

[0119] The 45-degree oblique threading process of the intermediate layer and the tensile force of forming a spider web with the center of the limiting knot can significantly enhance the overall flexural strength and crack resistance of the cement blanket after curing.

[0120] Through the synergistic effect of honeycomb structure, S-shaped limiting knot and diamond sand aggregate, it is significantly superior to traditional technical solutions in terms of strength, interfacial bonding and dimensional stability.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-strength composite cement blanket, comprising a protective layer, a three-dimensional woven structure, and a curable composite material filled in the mesh of the three-dimensional woven structure, wherein the three-dimensional woven structure comprises a top layer, a middle layer, and a bottom layer, the top layer being mesh-like, and the bottom layer being bonded to the protective layer and supporting the curable composite material; characterized in that, The middle layer of the three-dimensional fabric is a honeycomb-like three-dimensional structure formed by interlacing vertical fiber filaments and transversely inclined fiber filaments that are inclined relative to the vertical fiber filaments; the vertical fiber filaments penetrate the middle layer along the thickness direction and connect the top layer and the bottom layer; The transverse diagonal fiber filaments pass through several vertical fiber filaments in an S-shaped pattern, forming a limiting knot distributed on the top, middle and bottom layers of the three-dimensional fabric structure. The limiting knot mechanically locks the transverse diagonal fiber filaments and the vertical fiber filaments to form an overall tensile-strength-enhancing structure. Furthermore, the transverse diagonal fiber filaments and the vertical fiber filaments intertwine with each limiting knot to form a honeycomb-shaped three-dimensional structure corresponding to the grid of the top layer.

2. The high-strength composite cement blanket according to claim 1, characterized in that, The angle of inclination of the transversely drawn fiber relative to the vertical fiber is 45°; The gap between two adjacent transversely drawn diagonal fibers is 1 mm to 3 mm; The number of transversely drawn fibers in each square meter of intermediate layer is at least 500.

3. The high-strength composite cement blanket according to claim 1, characterized in that, The three-dimensional fabric per square meter has 18,000 to 20,000 mesh openings, which are formed by the interlacing of the vertical fiber filaments and the transverse oblique fiber filaments in a hexagonal shape, forming the honeycomb three-dimensional structure; Each of the mesh openings is provided with a vertical support wire, which is part of the vertical fiber filament. The vertical support wire extends from the top of the current mesh opening to the bottom of the adjacent mesh opening, forming a spider web-like tension transmission network.

4. The high-strength composite cement blanket according to claim 3, characterized in that, Each of the mesh openings is provided with two vertical support wires, which are arranged either crosswise or parallel. The total number of vertical support filaments in the three-dimensional fabric per square meter is 35,000.

5. The high-strength composite cement blanket according to claim 1, characterized in that, The limiting knot is a knot formed by the continuous S-shaped winding of multiple vertical fiber filaments by the transversely drawn oblique fiber filaments. The limiting knot forms the main tensile node in the intermediate layer to bear bending stress, and forms a surface locking structure in the top and bottom layers to prevent edge fiber pull-out.

6. The high-strength composite cement blanket according to claim 1, characterized in that, The mesh size of the top layer is 200 to 300 meshes; The fiber diameters of the top and bottom layers are both larger than those of the intermediate layer, forming a gradient structure of a surface constraint layer and an internal flexible reinforcement layer.

7. The high-strength composite cement blanket according to claim 6, characterized in that, The intermediate layer is also embedded with a glass fiber mesh layer, which is fixed by the limiting knot; The edges of the glass fiber mesh extend to the outer regions of the top layer and the bottom layer, forming an overall encapsulated and reinforced structure.

8. The high-strength composite cement blanket according to any one of claims 1 to 7, characterized in that, The bottom layer of the three-dimensional fabric structure is bonded to the protective layer with hot melt adhesive. The protective layer is a composite structure consisting of a first PET spunlace nonwoven fabric, a PE waterproof membrane, and a second PET spunlace nonwoven fabric stacked in sequence.

9. The high-strength composite cement blanket according to claim 8, characterized in that, The PET spunlace nonwoven fabric has a basis weight of 40 g / m². 2 Up to 120g / m 2 The PE waterproof membrane has a thickness of 0.1mm to 0.3mm and a weight of 30g / m³. 2 ; The hot melt adhesive is either EVA hot melt adhesive or TPU hot melt adhesive, with a coating amount of 125g / m². 2 Up to 250g / m 2 .

10. The high-strength composite cement blanket according to any one of claims 1 to 7, characterized in that, The curable composite material includes a cement matrix and aggregates, wherein the aggregates contain corundum. The particle size of the corundum is 0.1 mm to 2 mm. The corundum fills the mesh of the honeycomb three-dimensional structure and forms a mechanical interlock with the fiber filaments.

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