High-strength heat-insulating concrete canvas and construction method thereof

Abstract

The application discloses a high-strength heat-insulation concrete canvas and a construction method thereof. The concrete canvas comprises a strength layer, an anchoring and bonding layer, a heat-insulation layer and a sealing layer which are sequentially arranged. The heat-insulation layer and the sealing layer are connected through an adhesive. The first fiber mesh layer, the three-dimensional mesh fabric layer and the second fiber mesh layer of the strength layer are woven into an integral blanket through a needle punching technology. The three-dimensional mesh fabric layer is filled with high-strength dense mortar in the pores. The second fiber mesh layer is connected with the anchoring and bonding layer. The anchoring and bonding layer is composed of an anchoring structure and a bonding material. The bonding material is a cement-based cementing material which plays a bonding and filling role and is filled in the anchoring structure. The bonding material is solidified and connected with the strength layer and the heat-insulation layer. The application has the beneficial effects that the application can realize the synergistic promotion of the high strength and the heat-insulation performance under the premise that the material is suitable for rapid paving and on-site hardening and forming, and the stability and forming quality of the facade construction are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of concrete canvas technology, and in particular to a high-strength heat-insulating concrete canvas and its construction method. Background Technology

[0002] Concrete canvas is a type of fabric-reinforced cementitious composite material with a three-dimensional spaced fabric as its skeleton, cementitious binder filling its pores, and hardening by watering to form a thin-layer concrete structure. Due to its convenient transportation, fast hardening speed, and simple construction, it has been applied in scenarios such as military temporary buildings, retaining wall lining, slope protection, and canal and pipeline protection.

[0003] The existing cementitious materials system for concrete canvas is usually based on ordinary Portland cement, or sulfoaluminate cement or high-alumina cement that has been simplified and modified with gypsum, etc. Therefore, the strength level is often limited, with the 28-day compressive strength typically ranging from 20 to 50 MPa. This is insufficient to meet the combined requirements of higher early strength and higher late strength for applications that require rapid construction and early load bearing.

[0004] At the same time, existing concrete canvases are mostly designed for structural and protective purposes, lacking specialized thermal insulation design. Therefore, in cold or high-temperature environments, they are difficult to meet the dual requirements of thermal comfort and high strength of structures at the same time, which limits their applicability and user experience in building construction.

[0005] In addition, when concrete canvas is constructed on slopes or vertical surfaces, the existing mix design is prone to slurry sagging, resulting in uneven laying thickness and increased local defects. This affects the construction quality as well as the strength stability and durability after hardening, which is one of the key obstacles to its promotion and application in complex construction scenarios. Summary of the Invention

[0006] To overcome the shortcomings of existing concrete canvases, such as limited strength, lack of specialized thermal insulation design, and slurry dripping during construction on sloping or vertical surfaces, which affects construction quality and strength stability, this invention provides a high-strength thermal insulation concrete canvas and its construction method.

[0007] To achieve the above-mentioned objective, the present invention provides a high-strength thermal insulation concrete canvas, comprising a strength layer, an anchoring and bonding layer, a thermal insulation layer, and a sealing layer arranged sequentially from top to bottom along the thickness direction; the thermal insulation layer and the sealing layer are bonded together by an adhesive. The strength layer includes a first fiber web layer, a three-dimensional mesh structure fabric layer, and a second fiber web layer. The first fiber web layer, the three-dimensional mesh structure fabric layer, and the second fiber web layer are woven into an integral blanket using needle punching technology. The pores of the three-dimensional mesh structure fabric layer are filled with high-strength dense mortar. The second fiber web layer is connected to the anchoring bonding layer. The anchoring bonding layer consists of an anchoring structure and an adhesive material. The anchoring structure includes a matrix mesh structure and a barbed structure. The barbed structure is located at the nodes of the matrix mesh structure and penetrates the anchoring bonding layer, extending in two directions towards the strength layer and the insulation layer to form a mechanical anchor. The adhesive material is a cement-based binder that serves to bond and fill the anchoring structure. The adhesive material is cured and bonded to the strength layer and the insulation layer.

[0008] Preferably, the length of the barb structure is greater than 60% of the sum of the thickness of the insulation layer and the thickness of the strength layer.

[0009] Preferably, the matrix mesh structure is made of flexible metal or carbon fiber, and the filament diameter of the matrix mesh structure is greater than 0.5 mm; the barb structure is made of the same material as the matrix mesh structure, or the barb structure is made of high-strength alloy material.

[0010] Preferably, the insulation layer is a flexible insulation felt; the flexible insulation felt is a composite felt formed by combining one or more of aerogel felt and asbestos felt; and the thermal conductivity of the flexible insulation felt is less than or equal to 0.05 W / m·K, and the thickness is 5-20 mm.

[0011] Preferably, the sealing layer is a polymer-based waterproof and moisture-proof membrane, which is a modified bitumen waterproof membrane, a polyvinyl chloride waterproof membrane, a thermoplastic polyolefin waterproof membrane, an ethylene-vinyl acetate copolymer waterproof membrane, or an ethylene propylene diene monomer (EPDM) rubber waterproof membrane; and the water vapor transmission rate of the polymer-based waterproof and moisture-proof membrane is less than 5.0 mg / (m²·h), and the thickness of the sealing layer is 1.5-3.0 mm.

[0012] Preferably, the adhesive is MS modified silane structural adhesive, polyurethane structural adhesive or modified acrylate structural adhesive, and the adhesive layer formed by the adhesive has a thickness of 0.5-2 mm.

[0013] Preferably, the high-strength dense mortar is composed of a gel material and fine aggregate in a weight ratio of 0.8-1.12; wherein, The gel material is composed of the following raw materials in parts by weight: 25-55 parts of rapid-hardening gelling main material, 5-20 parts of densifying micro powder, 10-40 parts of functional mineral filler, 2-15 parts of lightweight reinforcing filler, 0.5-5 parts of reaction regulating material, 0.3-2 parts of plasticizing and flow-regulating system, and 0.1-1.5 parts of thixotropic thickening system; Fine aggregate is a type of natural river sand, quartz sand and manufactured sand. The fineness modulus of fine aggregate is between 2.3 and 3.0, the particle size is ≤2.36mm, and the mud content is ≤1.0%.

[0014] Preferably, the thickness of the high-strength dense mortar filling layer is 5-25mm.

[0015] Preferably, the rapid-hardening cementitious main material is a composite system of two or more of aluminate cement, sulfate minerals and aluminate solid waste powder, wherein the grade of chlorate cement is higher than CA60. The sulfate mineral is at least one of hemihydrate gypsum, phosphogypsum, desulfurized gypsum, and titanium gypsum; Aluminate solid waste powder is industrial solid waste powder containing alumina, including at least one of high-alumina coal gangue calcined powder or calcined aluminum slag treatment powder and refractory waste brick powder. The reaction control material is composed of one, two, or three of the following: calcium aluminate-based setting component, magnesium expansion component, and crystal growth control component; wherein, the calcium aluminate-based setting component is calcium aluminate cement or calcium aluminate mineral powder, the magnesium expansion component is magnesium oxide expansion agent or temperature-controlled magnesium oxide expansion agent, and the crystal growth control component is sulfate, seed crystal, or inorganic salt crystal inducer. The densified micro powder is at least one of silica fume, nano-silica, ultrafine metakaolin, and ultrafine slag micro powder, wherein the silica fume has a silica content greater than 95%; the nano-silica has an average particle size of 10-100 nm, a specific surface area of ​​50-300 m² / g, and a silica content greater than 98%; the ultrafine metakaolin has a D50 particle size of less than 5 μm, a specific surface area greater than 15 m² / g, and an activity index greater than 110%; and the ultrafine slag micro powder has a specific surface area of ​​600-1000 m² / kg and a 28-day activity index greater than 105%. Functional mineral fillers include at least one of the following: ferrosilicon smelting tailings powder, quartzite-type mine tailings powder, ultrafine basalt powder, spodumene beneficiation tailings powder, and volcanic pumice powder; the ferrosilicon smelting tailings powder has an SiO2 content greater than 60%, a D50 particle size of 5-50 μm, and a density of 2.5-3.0 g / cm³; the quartzite-type mine tailings powder has an SiO2 content greater than 70%, and a D50 particle size of 10-80 μm; ultrafine basalt... Stone powder has a D50 particle size of less than 10 μm, a specific surface area of ​​400-800 m² / kg, and a density of 2.7-3.1 g / cm³; spodumene tailings powder has an Al₂O₃ content of greater than 15%, a D50 particle size of 5-50 μm, and a density of 2.4-2.8 g / cm³; volcanic pumice fine powder has a density of 0.5-1.5 g / cm³, a porosity of greater than 40%, and a D50 particle size of 10-100 μm. The lightweight reinforcing filler is at least one of hollow ceramic microspheres, glass microspheres, cellulose microfibers and basalt short-cut fibers, and the particle size of the hollow ceramic microspheres is 20-150μm. The plasticizing and flow-regulating system comprises at least one of polycarboxylate superplasticizer, melamine-based high-efficiency superplasticizer powder, allyl slump retainer, and redispersible latex powder. The thixotropic thickening system is bentonite and / or cellulose ether; the bentonite is modified bentonite with a montmorillonite content greater than 70%, a swelling ratio greater than 20 L / g, and a D50 particle size of 5-30 μm; the cellulose ether is hydroxypropyl methylcellulose or hydroxyethyl cellulose, and its 2% aqueous solution has a viscosity of 5000-100000 mPa·s.

[0016] To better achieve the above-mentioned objectives, the present invention provides a construction method for concrete canvas, characterized in that the construction method includes the following steps: (1) Lay a composite layer on the frame. The composite layer consists of a sealing layer, an insulation layer and an anchoring bonding layer. The composite layer is fabricated in the factory through bonding and weaving processes. (2) During construction, the completed composite layer is sprayed with water using a misting system. The water spray volume is 2.5 kg / m². 2 After misting and watering, the composite layer is covered with a film for curing, which takes 1 day.

[0017] The beneficial effects of this invention are: it achieves a synergistic improvement in high strength and thermal insulation performance while maintaining the material's suitability for rapid installation and on-site hardening, and significantly improves the stability and quality of facade construction. Comparative results show that both early and late strength are improved, puncture resistance and interlayer bonding are stronger, thermal insulation indicators are significantly improved, and density and durability-related indicators are also superior. This invention is more suitable for construction applications with higher requirements for load-bearing capacity, thermal comfort, and construction adaptability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the concrete canvas structure in Embodiment 1 of the present invention.

[0019] Figure 2 This is a schematic diagram of the strength layer of the concrete canvas in Embodiment 1 of the present invention.

[0020] Figure 3 This is a top view schematic diagram of the anchoring bonding layer of the concrete canvas in Embodiment 1 of the present invention.

[0021] Figure 4 This is a schematic diagram of the anchoring structure in the anchoring bonding layer of the concrete canvas in Embodiment 1 of the present invention.

[0022] Figure descriptions: 1. Strength layer; 2. Anchoring and bonding layer; 3. Thermal insulation layer; 4. Sealing layer; 1-1. Loose-woven fiber web top layer; 1-2. Three-dimensional mesh structure fabric layer; 1-3. Dense-woven fiber web bottom layer; 2-1. Barbed structure; 2-2. Network structure matrix; 2-1. Barbed structure; 2-2. Network structure matrix; 2-3. Barbed structure. Detailed Implementation

[0023] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0024] Example 1 See Figure 1 This invention provides a high-strength thermal insulation concrete canvas, which includes, from top to bottom along the thickness direction, a strength layer, an anchoring bonding layer, a thermal insulation layer, and a sealing layer.

[0025] like Figure 2 As shown, the strength layer consists of a first fiber web layer, a three-dimensional mesh structure fabric layer, and a second fiber web layer, and is a composite structure of needle-punched into an integral blanket; wherein, the pores of the three-dimensional mesh structure fabric layer are filled with high-strength dense mortar, and the thickness of the high-strength dense mortar filling is 10mm.

[0026] This high-strength, dense mortar is a multi-component composite reaction system, composed of gelling materials and fine aggregates. The gelling material consists of a rapid-hardening cementitious main material in a mass ratio of 55:10:23:10:1:0.7:0.3, densified micro powder, functional mineral fillers, lightweight reinforcing fillers, reaction regulating materials, a plasticizing and flow-regulating system, and a thixotropic thickening system. The rapid-hardening cementitious main material is a blend of CA70 aluminate cement and α-type hemihydrate gypsum (note: α-type hemihydrate gypsum is a sulfate mineral), with a mass ratio of... For example, the ratio is 80:20. The densifying powder is ultrafine silica fume with a silica content of not less than 95%. The functional mineral filler is quartzite-type mine tailings powder (SiO2 content greater than 70%, D50 particle size of 10-80μm). The lightweight reinforcing filler uses hollow ceramic microspheres with a particle size of about 80μm. The reaction regulating material is calcium aluminate cement. The plasticizing and flow-regulating system includes melamine-based high-efficiency water-reducing agent powder. The thixotropic thickening system uses hydroxypropyl methylcellulose, whose 2% aqueous solution has a viscosity of 20000 mPa•s. The fine aggregate is quartz sand with a fineness modulus of 2.5, a particle size ≤2.36mm, and a mud content ≤1.0%. The mass ratio of the cementitious material to the fine aggregate in the high-strength dense mortar is 1:1.1.

[0027] The sealing layer is a polyvinyl chloride-based waterproof membrane with a water vapor transmission rate of less than 5.0 mg / (m²·h) and a thickness of 2.0 mm; the insulation layer is an aerogel felt with a thermal conductivity of no more than 0.05 W / m·K and a thickness of 15 mm; MS modified silane adhesive is used as the bonding agent between the insulation layer and the sealing layer, and the adhesive layer thickness is 0.5 mm.

[0028] like Figure 3 and Figure 4As shown, the anchoring bonding layer consists of an anchoring structure and an adhesive material. The anchoring structure includes a base mesh structure and a barbed structure. The base mesh structure is made of steel alloy material with a wire diameter greater than 0.5 mm. The barbed structure is set at the nodes of the base mesh structure and extends in both vertical and horizontal directions. The length of the barbed structure is greater than 60% of the sum of the thicknesses of the insulation layer and the strength layer. The barbed structure is made of the same flexible steel alloy material as the base mesh structure. The anchoring structure is filled with cement-based adhesive material to achieve a cured connection with the adjacent layers.

[0029] This invention provides a construction method for concrete canvas as described in Example 1, the construction method comprising the following steps: (1) Lay a composite layer on the frame. The composite layer consists of a sealing layer, an insulation layer and an anchoring bonding layer. The composite layer is fabricated in the factory through bonding and weaving processes. (2) During construction, the completed composite layer is sprayed with water using a misting system. The water spray volume is 2.5 kg / m². 2 After misting and watering, the composite layer is covered with a film for curing, which takes 1 day.

[0030] Example 2 See Figure 1 This invention provides a high-strength thermal insulation concrete canvas, which includes, from top to bottom along the thickness direction, a strength layer, an anchoring bonding layer, a thermal insulation layer, and a sealing layer.

[0031] like Figure 2 As shown, the strength layer consists of a first fiber web layer, a three-dimensional mesh structure fabric layer, and a second fiber web layer, and is a composite structure formed by needle punching into an integral blanket; wherein, the pores of the three-dimensional mesh structure fabric layer are filled with high-strength dense mortar, and the filling thickness of the high-strength dense mortar is 8mm.

[0032] This high-strength, dense mortar is a multi-component composite reaction system, composed of gelling materials and fine aggregates. The gelling material consists of a rapid-hardening cementitious main material in a mass ratio of 50:10:25:13:1:0.5:0.5, densifying micro-powder, functional mineral fillers, lightweight reinforcing fillers, reaction regulating materials, a plasticizing and flow-regulating system, and a thixotropic thickening system. Among them: The rapid-hardening cementitious main material is a compound of CA70 aluminate cement and α-type hemihydrate gypsum, with a mass ratio of 75:25. The densifying micro powder is a mixture of silica fume and nano-silica, with a mass ratio of 7:3. The silica fume has a silica content of not less than 95%, and the nano-silica has an average particle size of 10-100nm, a specific surface area of ​​180m² / g, and a silica content of greater than 98%. The functional mineral filler is ultrafine basalt powder with a D50 particle size of less than 10μm, a specific surface area of ​​400-800m² / kg, and a density of 2.7-3.1g / cm³. The lightweight reinforcing filler is hollow ceramic microspheres with a particle size of about 50μm. The reaction regulating material is a trace amount of calcium aluminate modifier. The plasticizing and flow-regulating system includes polycarboxylate superplasticizer. The thixotropic thickening system uses modified bentonite with a montmorillonite content of 80%, an expansion ratio of 25L / g, and a D50 particle size of 25μm. The fine aggregate is natural river sand with a fineness modulus of 2.6, a particle size of ≤2.36mm, and a mud content of ≤1.0%; the mass ratio of the cementitious material to the fine aggregate in the high-strength dense mortar is 1:1.2.

[0033] The sealing layer is a thermoplastic polyolefin waterproof membrane with a water vapor permeability of less than 5.0 mg / (m²•h) and a thickness of 1.5 mm. The insulation layer is an aerogel felt with a thermal conductivity of no more than 0.05 W / m•K and a thickness of 17 mm. MS modified silane adhesive is used as the bonding agent between the insulation layer and the sealing layer, and the adhesive layer thickness is 0.5 mm.

[0034] like Figure 3 and Figure 4 As shown, the anchoring adhesive layer consists of an anchoring structure and an adhesive material. The anchoring structure includes a matrix mesh structure and a barbed structure, wherein: The matrix mesh structure is made of carbon fiber material with a filament diameter greater than 0.5 mm; The barbed structure is set at the nodes of the matrix mesh structure and extends in both vertical and horizontal directions. The length of the barbed structure is greater than 60% of the sum of the thickness of the insulation layer and the strength layer. The barbed structure material is the same as the matrix mesh structure material, which is a carbon fiber composite material; The anchoring structure is filled with cement-based adhesive material to achieve a solidified connection with the adjacent layers.

[0035] This invention provides a construction method for concrete canvas as described in Example 2, the method comprising the following steps: (1) Lay a composite layer on the frame. The composite layer consists of a sealing layer, an insulation layer and an anchoring bonding layer. The composite layer is fabricated in the factory through bonding and weaving processes. (2) During construction, the completed composite layer is sprayed with water using a misting system. The water spray volume is 2.5 kg / m². 2After misting and watering, the composite layer is covered with a film for curing, which takes 1 day.

[0036] Example 3 See Figure 1 This invention provides a high-strength thermal insulation concrete canvas, which includes, from top to bottom along the thickness direction, a strength layer, an anchoring bonding layer, a thermal insulation layer, and a sealing layer.

[0037] like Figure 2 As shown, the strength layer consists of a first fiber web layer, a three-dimensional mesh structure fabric layer, and a second fiber web layer, and is a composite structure formed by needle punching into an integral blanket; wherein, the pores of the three-dimensional mesh structure fabric layer are filled with high-strength dense mortar, and the thickness of the high-strength dense mortar filling is 12mm.

[0038] This high-strength, dense mortar is a multi-component composite reaction system, composed of gelling materials and fine aggregates. The gelling material consists of a rapid-hardening cementitious main material in a mass ratio of 50:5:30:13:0.8:0.7:0.5, densifying micro-powder, functional mineral fillers, lightweight reinforcing fillers, reaction regulating materials, a plasticizing and flow-regulating system, and a thixotropic thickening system. Specifically, the rapid-hardening cementitious main material is a blend of CA70 aluminate cement and α-type hemihydrate gypsum in a mass ratio of 80:20; the densifying micro-powder is nano-silica with an average particle size of 10 mm. The particles are -50nm in diameter, with a specific surface area of ​​200m² / g and a silica content greater than 98%. The functional mineral filler is ultrafine basalt powder with a D50 particle size of less than 10μm, a specific surface area of ​​650m² / kg, and a density of 2.9g / cm³. The lightweight reinforcing filler is hollow ceramic microspheres with a particle size of approximately 50μm. The reaction regulating material is a trace amount of calcium aluminate modifier. The plasticizing and flow-regulating system is polycarboxylate high-efficiency water-reducing agent powder. The thixotropic thickening system uses hydroxyethyl cellulose, whose 2% aqueous solution has a viscosity of 25000mPa•s. The fine aggregate is quartz sand with a fineness modulus of 2.5, a particle size ≤2.36mm, and a mud content ≤1.0%. The mass ratio of the cementitious material to the fine aggregate in the high-strength dense mortar is 1:1.

[0039] The sealing layer is a thermoplastic polyolefin waterproof membrane with a water vapor permeability of less than 5.0 mg / (m²•h) and a thickness of 2.5 mm. The insulation layer is an aerogel felt with a thermal conductivity of no more than 0.040 W / m•K and a thickness of 20 mm. A modified acrylic structural adhesive is used as the bonding agent between the insulation layer and the sealing layer, and the thickness of the bonding layer is 1.0-1.5mm.

[0040] like Figure 3 and Figure 4 As shown, the anchoring adhesive layer consists of an anchoring structure and an adhesive material. The anchoring structure includes a matrix mesh structure and a barbed structure, wherein: The matrix mesh structure is made of steel alloy with a wire diameter greater than 0.5 mm; The barbed structure is set at the nodes of the matrix mesh structure and extends in both vertical and horizontal directions. The length of the barbed structure is greater than 60% of the sum of the thickness of the insulation layer and the strength layer. The barbed structure is made of high-strength steel alloy material; The anchoring structure is filled with cement-based adhesive material to achieve a solidified connection with the adjacent layers.

[0041] This invention provides a construction method for concrete canvas as described in Example 3, the method comprising the following steps: (1) Lay a composite layer on the frame. The composite layer consists of a sealing layer, an insulation layer and an anchoring bonding layer. The composite layer is fabricated in the factory through bonding and weaving processes. (2) During construction, the completed composite layer is sprayed with water using a misting system. The water spray volume is 2.5 kg / m². 2 After misting and watering, the composite layer is covered with a film for curing, which takes 1 day.

[0042] Experimental Example The following proportioning tests were conducted based on the embodiments. By comparing the mechanical properties, thermal insulation properties, and workability of the traditional high-alumina cement-gypsum system (as a comparative example) with those of Examples 1-3 of the present invention, the comprehensive performance of the high-strength thermal insulation concrete canvas for building construction of the present invention was analyzed, and the results are shown in Table 1.

[0043] Table 1. Comparison of mechanical and functional properties between the embodiments of the present invention and the comparative embodiments.

[0044] As can be seen from Table 1, compared with the traditional high-alumina cement-gypsum system, Examples 1-3 of the present invention show simultaneous improvements in key indicators such as mechanical properties, thermal insulation performance, interlayer bonding, and construction adaptability. Details are as follows: (1) The strength system shows that the early strength improvement is the most significant and takes into account the later strength growth. The 1-day compressive strength increases from 18.6MPa to 32.2-36.8MPa, the 3-day compressive strength increases from 32.4MPa to 44.1-48.5MPa, the 28-day compressive strength increases from 52.1MPa to 58.4-63.2MPa, and the 28-day flexural strength increases from 6.3MPa to 8.5-9.8MPa. This shows that the embodiments 1-3 of the present invention can not only form a load-bearing skeleton faster, but also maintain a high strength level and bending toughness in the later stage.

[0045] (2) The structural reliability and safety indicators have also been significantly improved. The peak value of thin-layer puncture resistance has increased from 9.4kN to 12.6-14.5kN, and the interlayer bonding strength has increased from 0.42MPa to 0.65-0.78MPa. The combined effect of the simultaneous improvement of "thin-layer puncture resistance" and "interlayer bonding" makes it more suitable for the anti-damage and anti-peeling requirements of thin-layer composite morphology.

[0046] (3) The thermal and durability-related indicators demonstrate the stability of the functional improvement. The thermal conductivity decreased from 0.062 W / m·K to 0.024-0.028 W / m·K, the water absorption rate decreased from 7.6% to 4.0%-4.1%, the strength retention rate after freeze-thaw cycles increased from 78% to 87%-91%, and the dry density decreased from 1850 kg / m³ to 1500-1650 kg / m³. In this embodiment of the invention, while achieving lower thermal conductivity, the material is lighter overall and has better resistance to water damage and freeze-thaw degradation.

[0047] (4) In terms of construction adaptability, the height of the facade construction flow is significantly reduced from 16mm to 3-4mm, indicating that its workability is more stable under facade conditions, which helps to reduce the quality fluctuation caused by uneven forming thickness, thus forming a positive correlation with strength stability and durability performance.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-strength, heat-insulating concrete canvas, characterized in that, It includes a strength layer, an anchoring and bonding layer, a thermal insulation layer, and a sealing layer arranged sequentially from top to bottom along the thickness direction; the thermal insulation layer and the sealing layer are bonded together by an adhesive. The strength layer includes a first fiber web layer, a three-dimensional mesh structure fabric layer, and a second fiber web layer. The first fiber web layer, the three-dimensional mesh structure fabric layer, and the second fiber web layer are woven into an integral blanket using needle punching technology. The pores of the three-dimensional mesh structure fabric layer are filled with high-strength dense mortar. The second fiber mesh layer is bonded to the anchoring adhesive layer; The anchoring bonding layer consists of an anchoring structure and an adhesive material. The anchoring structure includes a matrix mesh structure and a barbed structure. The barbed structure is located at the nodes of the matrix mesh structure and penetrates the anchoring bonding layer, extending in two directions towards the strength layer and the insulation layer to form a mechanical anchor. The adhesive material is a cement-based binder that serves to bond and fill the anchoring structure. The adhesive material is cured and bonded to the strength layer and the insulation layer.

2. The concrete canvas according to claim 1, characterized in that, The length of the barbed structure is greater than 60% of the sum of the thickness of the insulation layer and the thickness of the strength layer.

3. The concrete canvas according to claim 2, characterized in that, The matrix mesh structure is made of flexible metal or carbon fiber, and the filament diameter of the matrix mesh structure is greater than 0.5 mm; the barb structure is made of the same material as the matrix mesh structure, or the barb structure is made of high-strength alloy material.

4. The concrete canvas according to claim 1, characterized in that, The insulation layer is a flexible insulation felt; Flexible thermal insulation felt is a composite felt formed by combining one or more of aerogel felt and asbestos felt; and the thermal conductivity of the flexible thermal insulation felt is less than or equal to 0.05 W / m·K, and the thickness is 5-20mm.

5. The concrete canvas according to claim 1, characterized in that, The sealing layer is a polymer-based waterproof and moisture-proof membrane, which may be a modified bitumen waterproof membrane, a polyvinyl chloride waterproof membrane, a thermoplastic polyolefin waterproof membrane, an ethylene-vinyl acetate copolymer waterproof membrane, or an EPDM rubber waterproof membrane; and the water vapor transmission rate of the polymer-based waterproof and moisture-proof membrane is less than 5.0 mg / (m²·h), and the thickness of the sealing layer is 1.5-3.0 mm.

6. The concrete canvas according to claim 1, characterized in that, The adhesive is MS modified silane structural adhesive, polyurethane structural adhesive or modified acrylate structural adhesive, and the adhesive layer formed by the adhesive has a thickness of 0.5-2 mm.

7. The concrete canvas according to claim 1, characterized in that, High-strength dense mortar is composed of gelling material and fine aggregate in a weight ratio of 0.8-1.12; among which, The gel material is composed of the following raw materials in parts by weight: 25-55 parts of rapid-hardening gelling main material, 5-20 parts of densifying micro powder, 10-40 parts of functional mineral filler, 2-15 parts of lightweight reinforcing filler, 0.5-5 parts of reaction regulating material, 0.3-2 parts of plasticizing and flow-regulating system, and 0.1-1.5 parts of thixotropic thickening system; Fine aggregate is a type of natural river sand, quartz sand and manufactured sand. The fineness modulus of fine aggregate is between 2.3 and 3.0, the particle size is ≤2.36mm, and the mud content is ≤1.0%.

8. The concrete canvas according to claim 7, characterized in that, The thickness of the high-strength dense mortar filling layer is 5-25mm.

9. The concrete canvas according to claim 7, characterized in that, The main material of rapid-hardening cementitious material is a composite system of two or more of aluminate cement, sulfate minerals and aluminate solid waste powder. The sulfate mineral is at least one of hemihydrate gypsum, phosphogypsum, desulfurized gypsum, and titanium gypsum; Aluminate solid waste powder is industrial solid waste powder containing alumina, including at least one of high-alumina coal gangue calcined powder or calcined aluminum slag treatment powder and refractory waste brick powder. The reaction control material is composed of one, two, or three of the following: calcium aluminate-based setting component, magnesium expansion component, and crystal growth control component; wherein, the calcium aluminate-based setting component is calcium aluminate cement or calcium aluminate mineral powder, the magnesium expansion component is magnesium oxide expansion agent or temperature-controlled magnesium oxide expansion agent, and the crystal growth control component is sulfate, seed crystal, or inorganic salt crystal inducer. The densified micro powder is at least one of silica fume, nano-silica, ultrafine metakaolin, and ultrafine slag micro powder, wherein the silica fume has a silica content greater than 95%; the nano-silica has an average particle size of 10-100 nm, a specific surface area of ​​50-300 m² / g, and a silica content greater than 98%; the ultrafine metakaolin has a D50 particle size of less than 5 μm, a specific surface area greater than 15 m² / g, and an activity index greater than 110%; and the ultrafine slag micro powder has a specific surface area of ​​600-1000 m² / kg and a 28-day activity index greater than 105%. Functional mineral fillers include at least one of the following: ferrosilicon smelting tailings powder, quartzite-type mine tailings powder, ultrafine basalt powder, spodumene beneficiation tailings powder, and volcanic pumice powder; the ferrosilicon smelting tailings powder has an SiO2 content greater than 60%, a D50 particle size of 5-50 μm, and a density of 2.5-3.0 g / cm³; the quartzite-type mine tailings powder has an SiO2 content greater than 70%, and a D50 particle size of 10-80 μm; ultrafine basalt... Stone powder has a D50 particle size of less than 10 μm, a specific surface area of ​​400-800 m² / kg, and a density of 2.7-3.1 g / cm³; spodumene tailings powder has an Al₂O₃ content of greater than 15%, a D50 particle size of 5-50 μm, and a density of 2.4-2.8 g / cm³; volcanic pumice fine powder has a density of 0.5-1.5 g / cm³, a porosity of greater than 40%, and a D50 particle size of 10-100 μm. The lightweight reinforcing filler is at least one of hollow ceramic microspheres, glass microspheres, cellulose microfibers and basalt short-cut fibers, and the particle size of the hollow ceramic microspheres is 20-150μm. The plasticizing and flow-regulating system comprises at least one of polycarboxylate superplasticizer, melamine-based high-efficiency superplasticizer powder, allyl slump retainer, and redispersible latex powder. The thixotropic thickening system is bentonite and / or cellulose ether; the bentonite is modified bentonite with a montmorillonite content greater than 70%, a swelling ratio greater than 20 L / g, and a D50 particle size of 5-30 μm; the cellulose ether is hydroxypropyl methylcellulose or hydroxyethyl cellulose, and its 2% aqueous solution has a viscosity of 5000-100000 mPa·s.

10. A method for constructing a concrete canvas as described in any one of claims 1-9, characterized in that, The construction method includes the following steps: (1) Lay a composite layer on the frame. The composite layer consists of a sealing layer, an insulation layer and an anchoring bonding layer. The composite layer is fabricated in the factory through bonding and weaving processes. (2) During construction, the completed composite layer is sprayed with water using a misting system. The water spray volume is 2.5 kg / m². 2 After misting and watering, the composite layer is covered with a film for curing, which takes 1 day.

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