Anti-crack type multi-layer composite cement blanket

Abstract

The utility model discloses an anti-crack type multi-layer composite cement blanket, belongs to the technical field of building materials, and is particularly suitable for the construction field with higher waterproof requirements. The cement blanket sequentially comprises a top layer fabric, a water storage and moisture preservation layer, a heat preservation layer, a micro-expansive cement layer, a bottom layer fabric and an anti-skid layer from top to bottom. Wherein steel wire meshes are arranged between the micro-expansive cement layer and the heat preservation layer as well as between the micro-expansive cement layer and the bottom layer fabric, and a fiber reinforced layer is laid in the micro-expansive cement layer, so that the brittleness of hardened set cement can be effectively reduced; meanwhile, chemical energy released by hydration of the micro-expansive cement layer can be converted into mechanical energy, so that the hardened cement body generates self volume expansion, the cracking risk is reduced, the waterproof service life of the cement blanket is prolonged, a structural layer and a waterproof layer of the cement blanket are combined into a whole, and the production process is simplified; meanwhile, the fiber reinforced layer and the steel wire mesh layer are arranged on the cement blanket, so that the brittleness of hardened set cement is further reduced, and the crack resistance is enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of building materials, and in particular relates to an anti-cracking multi-layer composite cement blanket, which is particularly suitable for engineering fields with high waterproof requirements. Background Art

[0002] The scientific name of cement blanket is concrete cloth. It is a soft cloth impregnated with cement. When it comes into contact with water, it will react with water and harden into a very thin durable concrete layer that is waterproof and fireproof. Cement blanket is a composite structure made of special fabrics, filled with cement-based cementitious materials and aggregates, and covered with an anti-seepage lining on the bottom. Its construction is simple and fast. It only needs to be watered on site without vibration to form the required shape and strength. It is widely used in ditch laying, slope protection, roof protection, railway water conservancy, roads and agricultural irrigation.

[0003] Chinese patent CN213947676U discloses an impermeable concrete blanket, which is actually an impermeable cement blanket, specifically including a bottom geotextile layer, a sodium-based bentonite layer, a cement-based material layer and a non-woven geotextile layer, which are arranged in sequence from bottom to top. The middle material is a multiple structure, the lower layer is bentonite, so that the new product has a good waterproof and anti-seepage effect, and the upper layer is a cement-based material, which hardens after hydration reaction with water to form a building component as a whole. It not only has the performance of a conventional cement blanket, but also has excellent anti-seepage barrier performance.

[0004] The cement blanket in the above patent has the following shortcomings:

[0005] (1) The bentonite layer and the cement-based material layer are separated only by non-woven fabric, which cannot ensure that the two materials are completely isolated. Mixing is inevitable during transportation and construction;

[0006] (2) The degree of bonding between the bentonite layer and the cement-based material layer and the middle non-woven fabric is not high, and the cement-based material will shrink in volume and cause cracks during the hydration process. If the bentonite layer leaks, water will migrate upward along the cracks in the cement-based material layer, thereby making the cement blanket ineffective in terms of anti-seepage and waterproofing. Summary of the invention

[0007] In order to solve the shortcomings existing in the prior art, the utility model proposes an anti-cracking multi-layer composite cement blanket, which has the characteristics of stable performance, anti-cracking and waterproofing.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] The invention discloses a crack-resistant multi-layer composite cement blanket, which comprises, from top to bottom, a top fabric, a water storage and moisture retention layer, a thermal insulation layer, a micro-expansion cement layer, a bottom fabric and an anti-skid layer, and is formed in one step by a needle punching process.

[0010] In a further technical solution, the top layer fabric and the bottom layer fabric are both non-woven fabrics, and the thickness of the bottom layer fabric and the upper layer fabric is preferably 0.2-2 mm.

[0011] In a further technical solution, the water storage and moisture retention layer is a water-absorbing resin layer with a thickness of 0.2 to 0.4 mm.

[0012] In a further technical solution, the thermal insulation layer (3) is a geofelt or geotextile flexible sheet structure capable of thermal insulation, with a thickness of 1 to 2 mm.

[0013] In a further technical solution, the material used for the micro-expansive cement layer is micro-expansive cement, and a fiber-reinforced layer is arranged in the middle thereof, and the fiber-reinforced layer is parallel to the micro-expansive cement layer. The fiber-reinforced layer is a glass fiber mesh cloth, and the weight per unit area is 120-130 g / m 2 , thickness is 0.2~1mm; the mesh of glass fiber mesh cloth is generally square, and the mesh size can be between 8mm×8mm and 15mm×15mm.

[0014] In a further technical solution, a wire mesh is provided between the micro-expanding cement layer and the insulation layer and the bottom fabric. The mesh is square, the mesh size is 10mm×10mm, the steel wire diameter is 0.5mm~1mm, and the thickness of the wire mesh is 0.5~1mm.

[0015] In a further technical solution, the thickness of the anti-slip layer is 0.5-1 mm; the anti-slip layer is a mesh cloth with a mesh size of 10 mm×10 mm and a weight of 80-160 g / m 2 .

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] (1) The utility model combines the structural layer and the waterproof layer of the cement blanket into one. The chemical energy released by the cement hydration of the micro-expansive cement layer is converted into mechanical energy, so that the hardened cement body produces its own volume expansion to prevent it from cracking, thereby increasing the waterproof service life of the cement blanket and simplifying the production process. At the same time, a fiber reinforcement layer and a steel mesh layer are arranged on the cement blanket to further reduce the brittleness of the hardened cement stone and enhance its crack resistance.

[0018] (2) The utility model can effectively increase the friction between the cement blanket and the base surface by adding an anti-skid layer at the bottom of the cement blanket, thereby preventing the cement blanket from sliding in areas with large slopes and improving construction efficiency.

[0019] (3) The utility model can effectively lock in heat and moisture by adding a water-storing and moisture-retaining layer and a thermal insulation layer, thereby providing favorable conditions for the hydration of the expansion components in the micro-expanding cement layer, and can effectively improve the strength of the hardened cement and reduce the risk of cracking of the hardened cement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope.

[0021] Figure 1 The utility model provides a cross-sectional structural schematic diagram of a crack-resistant multi-layer composite cement blanket.

[0022] Among them, 1 is the top fabric, 2 is the water storage and moisture retention layer, 3 is the thermal insulation layer, 4 is the wire mesh, 5 is the micro-expanding cement layer, 5.1 is the fiber reinforcement layer, 6 is the bottom fabric, and 7 is the anti-slip layer. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Example

[0025] A crack-resistant multi-layer composite cement blanket, such as Figure 1 As shown, from top to bottom, it includes a top fabric 1, a water storage and moisture retention layer 2, a thermal insulation layer 3, a micro-expanding cement layer 5, a bottom fabric 6 and an anti-slip layer 7; a glass fiber reinforcement layer 5.1 is filled in the middle of the micro-expanding cement layer 5 and is parallel to it; a steel wire mesh 4 is provided between the micro-expanding cement layer 5 and the thermal insulation layer 3 and the bottom fabric 6; the steel wire mesh 4 can improve the bonding force between the cement-based material layer 5 and the thermal insulation layer 3 and the bottom fabric 6, and at the same time can reduce the risk of cracking of hardened cement and increase the integrity of the cement blanket.

[0026] The top fabric 1, water storage and moisture retention layer 2, thermal insulation layer 3, micro-expanding cement layer 5, bottom fabric 6 and anti-slip layer 7 are fixed together from top to bottom to form a three-dimensional space. In this embodiment, the top fabric 1 and the bottom fabric 6 are non-woven fabric layers with a thickness of about 1 mm.

[0027] In this embodiment, the anti-slip layer 7 is a mesh cloth with a mesh size of 10 mm×10 mm and a weight of 80 to 160 g / m 2 ; Thickness is 1mm. Its main function is to increase the friction coefficient between the cement blanket and the base layer during the construction process, which is beneficial to the laying of the cement blanket.

[0028] In this embodiment, the water storage and moisture retention layer 2 is a water-absorbing resin layer with a thickness of about 0.3 mm; the thermal insulation layer 3 is a geofelt with a thickness of about 1.5 mm.

[0029] In this embodiment, the micro-expansive cement layer 5 is silicate expansive cement with a thickness of about 10 mm. Micro-expansive cement can compensate for the shrinkage of cement-based materials during hardening, thereby effectively preventing cracking, and can also improve the density of the hardened cement body, thereby increasing its impermeability.

[0030] In this embodiment, the fiber reinforcement layer 5.1 is a glass fiber mesh cloth with a thickness of about 0.5-0.6 mm, a mesh size of 10 mm×10 mm, and a weight of 120-130 g / m 2 The main function is to effectively reduce the brittleness of the hardened cement stone and enhance its crack resistance.

[0031] In this embodiment, the thickness of the steel mesh 4 is 1 mm, the mesh is square, the mesh size is 10 mm×10 mm, and the diameter of the steel wire is 1 mm.

[0032] In this embodiment, the laying order of the crack-resistant multi-layer composite cement blanket is to first lay the anti-slip layer 7 and the bottom fabric 6, and then evenly lay the micro-expanding cement layer 5, wherein a glass fiber reinforced layer 5.1 is laid in the middle of the micro-expanding cement layer, and steel meshes 4 are arranged above and below the solidified cement-based material layer 5, and then the thermal insulation layer 3, the water storage and moisture retention layer 2 and the top fabric 1 are laid in sequence, and then the blanket is formed in one step through a needle punching process by a needle punching machine, thereby improving the overall stability of the cement blanket and ensuring that the micro-expanding cement layer inside the blanket is evenly distributed during transportation and construction.

[0033] When the utility model is in use, water needs to evenly permeate the cement blanket, and the water passes through the top fabric 1, the water storage and moisturizing layer 2, and the thermal insulation layer 3 in sequence until it reaches the micro-expanding cement layer 5. At the same time, the water storage and moisturizing layer 2 quickly absorbs water and stores the water; the micro-expanding cement layer 5 begins to hydrate after meeting water. During the hydration process, the thermal insulation layer 3 can prevent the heat loss during the cement hydration process, and the water storage and moisturizing layer 2 can continuously provide the water required for the cement hydration. At the same time, the chemical energy released by the hydration of the micro-expanding cement layer 5 is converted into mechanical energy, so that the hardened cement body produces its own volume expansion, enhances the density of the cement body, and prevents it from cracking; after the micro-expanding cement layer 5 solidifies, it solidifies with the steel mesh 4 and the fiber reinforcement layer 5.1 into a solid whole. The steel mesh 4 and the fiber reinforcement layer 5.1 can enhance the composite strength, reduce the brittleness of the hardened cement body and enhance its crack resistance, thereby realizing that the cement blanket structural layer and the waterproof layer are combined into one, and the waterproof layer has the same service life as the structural layer.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A crack-resistant multi-layer composite cement blanket, characterized in that: The invention comprises, from top to bottom, a top fabric (1), a water storage and moisture retention layer (2), a thermal insulation layer (3), a micro-expanding cement layer (5), a bottom fabric (6) and an anti-slip layer (7); wherein a fiber reinforcement layer (5.1) is laid inside the micro-expanding cement layer (5), and the fiber reinforcement layer is parallel to the micro-expanding cement layer; a steel mesh (4) is arranged between the micro-expanding cement layer (5) and the thermal insulation layer (3); and a steel mesh (4) is arranged between the micro-expanding cement layer (5) and the bottom fabric (6); The fiber-reinforced layer (5.1) is a glass fiber mesh cloth; and the water-storage and moisture-retaining layer (2) is a water-absorbing resin layer.

2. The anti-cracking multi-layer composite cement blanket according to claim 1, characterized in that: The thickness of the fiber reinforced layer is 0.2-1 mm.

3. The anti-cracking multi-layer composite cement blanket according to claim 1, characterized in that: The mesh of the glass fiber mesh cloth is square, the mesh size is in the range of 8mm×8mm to 15mm×15mm, and the weight per unit area is 120-130g / m 2 .

4. The anti-cracking multi-layer composite cement blanket according to claim 1, characterized in that: The thickness of the steel wire mesh (4) is 0.5-1 mm; the mesh of the steel wire mesh (4) is square, the mesh size is 10 mm×10 mm, and the diameter of the steel wire is 0.5 mm-1 mm.

5. The anti-cracking multi-layer composite cement blanket according to claim 1, characterized in that: The anti-slip layer (7) is a mesh cloth with a weight per unit area of ​​80 to 160 g / m 2 ; The thickness of the anti-slip layer (7) is 0.5 to 1 mm.

6. The anti-cracking multi-layer composite cement blanket according to claim 1, characterized in that: The top fabric (1) and the bottom fabric (6) are both non-woven fabrics with a thickness of 0.2 to 2 mm.

7. The anti-cracking multi-layer composite cement blanket according to claim 1, characterized in that: The thickness of the water storage and moisture retention layer (2) is 0.2-0.4 mm.

8. The anti-cracking multi-layer composite cement blanket according to claim 1, characterized in that: The thermal insulation layer (3) is geofelt or geotextile, and has a thickness of 1 to 2 mm.

9. The anti-cracking multi-layer composite cement blanket according to claim 1, characterized in that: The thickness of the micro-expanding cement layer (5) is 5 mm to 20 mm.

10. The anti-cracking multi-layer composite cement blanket according to claim 1, characterized in that The top fabric (1), the water storage and moisture retention layer (2), the thermal insulation layer (3), the micro-expanding cement layer (5), the bottom fabric (6) and the anti-slip layer (7) are formed at one time by a needle punching process.

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