CN114622666A - Novel heat-insulation thin-wall composite wallboard and preparation method thereof - Google Patents
Novel heat-insulation thin-wall composite wallboard and preparation method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 39
- 238000009413 insulation Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000004567 concrete Substances 0.000 claims abstract description 94
- 239000000835 fiber Substances 0.000 claims abstract description 39
- 239000004576 sand Substances 0.000 claims abstract description 39
- 238000004321 preservation Methods 0.000 claims abstract description 21
- 239000002585 base Substances 0.000 claims abstract description 20
- 239000003365 glass fiber Substances 0.000 claims abstract description 19
- 239000011381 foam concrete Substances 0.000 claims abstract description 17
- 239000003513 alkali Substances 0.000 claims abstract description 10
- 239000002023 wood Substances 0.000 claims description 46
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 38
- 239000004570 mortar (masonry) Substances 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000000203 mixture Substances 0.000 claims description 25
- 238000002156 mixing Methods 0.000 claims description 16
- 239000004568 cement Substances 0.000 claims description 14
- 239000003638 chemical reducing agent Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 11
- 239000006260 foam Substances 0.000 claims description 8
- 239000004088 foaming agent Substances 0.000 claims description 8
- 239000011159 matrix material Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 6
- 229910021487 silica fume Inorganic materials 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000005187 foaming Methods 0.000 claims description 2
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/008—Producing shaped prefabricated articles from the material made from two or more materials having different characteristics or properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
- B28B1/522—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement for producing multi-layered articles
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
- E04B1/7608—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only comprising a prefabricated insulating layer, disposed between two other layers or panels
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Civil Engineering (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention relates to the technical field of composite wallboards for buildings, and discloses a novel heat-insulating thin-wall composite wallboard and a preparation method thereof, wherein the novel heat-insulating thin-wall composite wallboard comprises two structural layers, a heat-insulating layer clamped between the two structural layers and a connecting piece for connecting the heat-insulating layer and the two structural layers together, the structural layers comprise a base concrete layer, a high-performance fine concrete layer and a fiber woven net layer, the base concrete layer is made of base concrete, the high-performance fine concrete layer is made of high-performance fine concrete, the fiber woven net is an alkali-resistant glass fiber net, the heat-insulating layer is made of low-density fiber reinforced sand foam concrete, and the connecting piece is an FRP rib; the invention has the characteristics of light structure weight, high strength, good durability, excellent heat preservation and insulation performance and good fireproof performance.
Description
Technical Field
The invention relates to the technical field of composite wallboards for buildings, in particular to a novel heat-insulation thin-wall composite wallboard and a preparation method thereof.
Background
The building envelope (including wall, door and window, roofing, etc.) is as the important component of building structure, and in the operation of building, the heat dissipation loss ratio of each position of building envelope is about: the heat transfer loss of the wall structure accounts for 60-70%, the heat transfer loss of the doors and windows accounts for 20-30%, and the heat transfer loss of the roof accounts for 10%, wherein the heat transfer loss of the wall structure accounts for the largest proportion, and the building energy conservation is an important measure for relieving the energy shortage, so that the wall energy conservation is an important way for achieving the aim of building energy conservation by developing a high-quality heat-preservation composite wallboard to change the form of a heat-preservation wall and further realize the wall energy conservation.
The prior composite wallboard generally adopts common concrete or lightweight concrete as a structural layer, adopts organic polymer material as an insulating layer, adopts a reinforcing steel bar connecting piece as a connecting piece for connecting the structural layer and the insulating layer, adopts the common concrete or the lightweight concrete as the structural layer, has the problems of generally low strength, large wallboard thickness, easy cracking on the surface and poor durability, adopts the organic polymer material as the insulating layer, has the problems of poor fireproof performance, influences on the use safety of the wallboard and the like to restrict the development and the application of the fireproof energy-saving wallboard, adopts the reinforcing steel bar connecting piece as the connecting piece for connecting the structural layer and the insulating layer, has the problem of reinforcing steel bar corrosion, according to the corresponding design specifications, a concrete protective layer with a corresponding thickness is required to avoid the corrosion of the steel bars, this increases the thickness and weight of the overall panel, which is very disadvantageous for the overall panel.
The fabric Reinforced Concrete (TRC) is a new type composite material formed from fibre woven net and fine Concrete, and possesses the advantages of corrosion resistance, good toughness, light weight and high strength, etc., in recent years it is increasingly extensively paid attention, and is specially suitable for making thin-wall light panel member, and has extensive application prospect in building envelope structure.
Disclosure of Invention
In view of the above, the invention provides a novel heat-insulating thin-wall composite wallboard and a preparation method thereof.
In order to solve the technical problems, the technical scheme of the invention is as follows: in a first aspect, the invention provides a novel heat-insulating thin-wall composite wallboard, which comprises two structural layers, a heat-insulating layer clamped between the two structural layers and a connecting piece used for connecting the heat-insulating layer and the two structural layers together.
Further, the structural layer includes that base member concrete layer, meticulous concrete layer of high performance and fibre weave the stratum reticulare, and meticulous concrete layer of high performance all has the setting at base member concrete layer's top and bottom, and the stratum reticulare is are woven to the fibre all has the setting between meticulous concrete layer of high performance of both sides and base member concrete layer.
Further, the matrix concrete layer is made of matrix concrete, the high-performance fine concrete layer is made of high-performance fine concrete, and the high-performance fine concrete comprises a mixture formed by mixing the following components in percentage by mass: cement, flyash, silica fume, water, river sand and water reducing agent in the weight ratio of 1 to 0.200 to 0.069 to 0.229 to 1.100 to 0.026, and the woven fiber net is alkali resisting glass fiber net.
Furthermore, chopped glass fiber is added in the high-performance fine concrete layer, and the volume mixing amount of the chopped glass fiber is 1-1.5%.
Furthermore, the thickness of the structural layer is 15-20 mm.
Furthermore, the heat-insulating layer is made of low-density fiber reinforced sand foam concrete, and the low-density fiber reinforced sand foam concrete comprises a mixture of the following components in percentage by mass: cement, water, ceramic sand, fine sand, foaming agent, water reducing agent, early strength agent and alkali-resistant glass fiber (1: 0.52: 0.06: 0.04: 0.0069: 0.004: 0.016: 0.0108).
Furthermore, the thickness of the heat preservation layer is 90-120 mm.
Furthermore, the connecting piece is an FRP rib.
On the other hand, the invention provides a preparation method of a novel heat-insulation thin-wall composite wallboard, which comprises the following steps:
step S1: preparing a wood mould required by the preparation of the composite wallboard, and pouring a first structural layer into the wood mould, wherein the pouring method comprises the following steps: putting cement, fly ash, silica fume and river sand into a mortar mixer according to the mass ratio of the components, uniformly mixing the mixture, adding water and a water reducing agent into the mortar mixer, mixing the mixture for a period of time, doping short glass fibers into the mortar mixer, continuously mixing the mixture for a period of time until the materials in the mortar mixer are uniformly mixed to obtain high-performance fine concrete, pouring part of the high-performance fine concrete into a wood mold, paving and leveling to form a first high-performance fine concrete layer, paving a first fiber woven mesh layer on the first high-performance fine concrete layer, pouring base concrete into the wood mold, paving and leveling to form a base concrete layer on the first high-performance fine concrete layer, paving a second fiber woven mesh layer on the base concrete layer, pouring the rest high-performance fine concrete into the wood mold, paving and leveling, forming a second high-performance fine concrete layer on the matrix concrete layer, and finally trowelling and compacting the concrete in the wood mould;
step S2: pouring a heat preservation layer on a first structural layer in the wood mould, wherein the pouring method comprises the following steps: adding cement, fine sand and ceramic sand into a mortar stirrer according to the mass ratio of the components, dry-stirring the mixture into powder by the stirrer, then uniformly mixing water, an early strength agent and a water reducing agent, then adding the mixture into the mortar stirrer, preparing a foaming agent into foam by a foaming machine according to the mass ratio of the components, then adding the foam into the mortar stirrer, stirring the mixture until the mixture is uniform, then adding alkali-resistant glass fibers into the mortar stirrer, stirring the mixture for a period of time until the materials in the mortar stirrer are uniformly mixed, thus obtaining low-density fiber reinforced sand foam concrete, pouring the low-density fiber reinforced sand foam concrete into a wood mold, paving and leveling the low-density fiber reinforced sand foam concrete to form a heat insulation layer on a first structural layer, and finally leveling the concrete in the wood mold;
step S3: arranging connecting pieces into the wood formwork, wherein the arranging method comprises the following steps: vertically inserting the connecting piece into the wood mold, inserting the connecting piece into the structural layer after penetrating through the heat insulation layer, and reserving a certain length to ensure that the top of the connecting piece can extend out of the top of the heat insulation layer;
step S4: maintaining the first structural layer and the heat insulation layer in the wood mould, and pouring a second structural layer into the wood mould by using the pouring method of the structural layer in the step S1 after the maintenance is finished, so that the heat insulation layer is sandwiched between the second structural layer and the first structural layer;
step S5: and (3) demolding after the two structural layers and the heat preservation layer in the wood mold are initially solidified, then performing watering maintenance, and finally placing in a dry environment for natural maintenance.
Compared with the prior art, the invention has the advantages that:
the invention provides a preparation method of a novel heat-preservation thin-wall composite wallboard, a structural layer in the prepared composite wallboard is made of a matrix concrete layer, a high-performance fine concrete layer and a fiber woven net layer, and the composite wallboard has the advantages of light structural mass, high strength and good durability, a heat preservation layer in the prepared composite wallboard is made of low-density fiber reinforced sand foam concrete, the heat conduction performance of a wall body can be reduced, the integral heat preservation and heat insulation effect of the composite wallboard is greatly improved, the composite wallboard integrally has the advantages of light structural mass, high strength, good durability, excellent heat preservation and heat insulation performance and good fireproof performance by combining the structural layer and the heat preservation layer, and the detected performance indexes are respectively: the compression strength is more than or equal to 5MPa, the bending failure load/dead weight multiple is more than or equal to 8, the softening coefficient is more than or equal to 1, and the total heat transfer coefficient is as follows: 0.774-0.909W/m 2. k, fire resistance: a1, make it can effectively improve house envelope's energy-conserving effect in the in-service use, can reduce the thickness and the weight of wall body on the premise of guaranteeing wall body bulk strength, compare in the precast concrete side fascia of traditional ordinary cement preparation, have light, high strength, fire prevention and heat retaining performance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a novel thermal insulation thin-wall composite wall panel according to the present invention;
fig. 2 is a schematic structural diagram of a structural layer of the present invention.
Reference numerals: 1. a structural layer; 11. a base concrete layer; 12. a high performance fine concrete layer; 13. A fiber woven mesh layer; 2. a heat-insulating layer; 3. a connecting member.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, the present invention provides a novel thermal insulation thin-wall composite wall panel, which comprises two structural layers 1, a thermal insulation layer 2 sandwiched between the two structural layers 1, and a connecting member 3 for connecting the thermal insulation layer 2 and the two structural layers 1 together;
the structural layer 1 comprises a matrix concrete layer 11, a high-performance fine concrete layer 12 and a fiber woven mesh layer 13, wherein the high-performance fine concrete layer 12 is divided into two layers, the two layers of high-performance fine concrete layers 12 are respectively arranged at the top and the bottom of the matrix concrete layer 11, the fiber woven mesh layer 13 is divided into two layers, and the fiber woven mesh layers 13 at two sides are respectively arranged between the two layers of high-performance fine concrete layers 12 and the matrix concrete layer 11; the base concrete layer 11 is formed by pouring base concrete, the high-performance fine concrete layer 12 is made of high-performance fine concrete, and the high-performance fine concrete comprises the following mixture of components in percentage by mass: cement, fly ash, silica fume, water, river sand and a water reducing agent are 1: 0.200: 0.069: 0.229: 1.100: 0.026, in order to improve the crack resistance and fatigue resistance of the high-performance fine concrete, chopped glass fibers are also added into the high-performance fine concrete, the volume mixing amount of the chopped glass fibers is 1-1.5%, the fiber woven mesh is an alkali-resistant glass fiber mesh, the preferred mesh size is 10 multiplied by 10mm, and the fiber woven mesh is arranged to enhance the bending strength of the whole structural layer 1; the strength grade of the structural layer 1 is 90-100 MPa, the bending strength grade is 1200-1800N, the heat conductivity coefficient is 0.7318W/m.k, and the thickness is 15-20 mm.
The heat preservation layer 2 is made of low-density fiber reinforced sand foam concrete, and the low-density fiber reinforced sand foam concrete comprises the following mixture of components in parts by mass: cement, water, ceramic sand, fine sand, foaming agent, water reducing agent, early strength agent and alkali-resistant glass fiber, wherein the weight ratio of the cement to the water to the ceramic sand to the fine sand to the foaming agent to the water reducing agent to the early strength agent is 1: 0.52: 0.06: 0.04: 0.0069: 0.004: 0.016: 0.0108; the compression strength of the heat-insulating layer 2 is more than 3.5MPa, and the dry density is less than 550kg/m3The thermal conductivity coefficient is less than 0.12 w/m.k, and the thickness is 50-120 mm.
The connecting piece 3 selects to be the FRP muscle, and the FRP muscle is as a novel high performance material, has advantages such as coefficient of thermal conductivity is low, the durability is good, the cost is low, intensity height, adopts the FRP muscle as connecting piece 3 can effectively avoid the heat bridge effect at connection position, improves the heat preservation effect and the security of wall body.
Example (b): the embodiment provides a preparation method of a novel heat-insulation thin-wall composite wallboard, which comprises the following steps:
step one, preparing a wood pattern required by preparing the composite wallboard, installing the wood pattern, cleaning and wiping the wood pattern, and finally coating a release agent;
secondly, pouring a first structural layer 1 into the wood mould, wherein the pouring method comprises the following steps: adding 100 parts of P.O 42.5 ordinary portland cement, 20 parts of secondary fly ash, 7 parts of silica fume and 110 parts of river sand into a mortar stirrer, wherein the maximum particle size of the river sand is not more than 1.2mm, uniformly mixing the added materials by using the mortar stirrer, uniformly mixing 23 parts of water and 2.6 parts of a special high-strength mortar water reducing agent according to the water-cement ratio of 0.18, adding the mixture into the mortar stirrer, uniformly stirring, adding 1.27 parts of 12mm chopped glass fibers into the mortar stirrer, and stirring for 2 minutes to obtain high-performance fine concrete slurry; then pouring part of the high-performance fine concrete into a wood mould for paving and leveling to form a first high-performance fine concrete layer 12, then paving a first fiber woven net layer 13 on the first high-performance fine concrete layer 12, then pouring the base concrete into the wood mould for paving and leveling to form a base concrete layer 11 on the first high-performance fine concrete layer 12, then paving a second fiber woven net layer 13 on the base concrete layer 11, then pouring the rest high-performance fine concrete into the wood mould for paving and leveling to form a second high-performance fine concrete layer 12 on the base concrete layer 11, finally leveling and compacting the concrete in the wood mould, and controlling the thickness of the first structural layer 1 to be 15mm to finish the pouring of the first structural layer 1;
thirdly, pouring the heat preservation layer 2 into the wood mold, wherein the pouring method comprises the following steps: adding 100 parts of P, O42.5 ordinary portland cement, 6 parts of wet ceramic sand and 4 parts of fine sand into a mortar stirrer, wherein the maximum particle size of the fine sand is not more than 6mm, dry-stirring the mixture into powder by the mortar stirrer, then uniformly mixing 52 parts of water, 1.6 parts of calcium chloride and 0.4 part of water reducing agent according to the water-cement ratio of 0.52, adding the mixture into the mortar stirrer, uniformly stirring the mixture, then adding 0.69 part of animal protein type foaming agent into the foaming agent to prepare foam, adding the foam into the mortar stirrer, uniformly mixing the foam to obtain slurry, then adding 1.08 parts of 12mm alkali-resistant glass fiber into the mortar stirrer, stirring the slurry for 1 minute to obtain low-density fiber reinforced sand foam concrete, pouring the low-density fiber reinforced sand foam concrete into a wood mold, paving and leveling the low-density fiber reinforced sand foam concrete to form a heat-insulating layer 2 on a first structural layer 1, finally leveling the concrete in the wood mold, controlling the overall thickness of the first structural layer 1 and the heat-insulating layer 2 to be 120mm, namely, the pouring of the heat-insulating layer 2 is completed;
fourthly, arranging the connecting pieces 3 into the wood mould, wherein the arranging method comprises the following steps: vertically inserting the connecting pieces 3 into the wood mould, inserting the connecting pieces 3 into the structural layer 1 after penetrating through the heat insulation layer 2, and enabling the tops of the connecting pieces 3 to extend 10mm out of the tops of the heat insulation layer 2, wherein the arrangement distance of the connecting pieces 3 in the wood mould is 150 mm;
fifthly, curing the first structural layer 1 and the heat preservation layer 2 in the wood mould for 24 hours, pouring the second structural layer 1 into the wood mould by using the pouring method of the structural layer 1 in the second step after curing is finished, and enabling the second structural layer 1 and the first structural layer 1 to sandwich the heat preservation layer 2, wherein the integral thickness of concrete in the wood mould is controlled to be 135 mm;
and sixthly, demolding after the two structural layers 1 and the heat preservation layer 2 in the wood mold are initially set, then performing watering maintenance for 8 days, and finally placing in a dry environment for natural maintenance for 26 days to obtain the composite wallboard.
Seventhly, detecting the physical properties of the prepared composite wallboard, wherein all performance indexes of the composite wallboard meet the conditions that the compressive strength is more than or equal to 5MPa, the bending failure load/dead weight multiple is more than or equal to 8, the softening coefficient is more than or equal to 1, and the total heat transfer coefficient: 0.774-0.909W/m 2 · k and fire resistance: and A1, the unqualified composite wallboard is unqualified and can not be put into use, and the qualified composite wallboard is qualified and can be put into use.
The above are only typical examples of the present invention, and besides, the present invention may have other embodiments, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the present invention as claimed.
Claims (9)
1. The utility model provides a novel heat preservation thin wall composite wall panel which characterized in that: the heat-insulating layer comprises two structural layers (1), a heat-insulating layer (2) clamped between the two structural layers (1) and a connecting piece (3) used for connecting the heat-insulating layer (2) and the two structural layers (1) together.
2. The novel heat-insulating thin-wall composite wallboard as claimed in claim 1, wherein: the structural layer (1) comprises a base concrete layer (11), a high-performance fine concrete layer (12) and a fiber woven net layer (13), wherein the high-performance fine concrete layer (12) is arranged at the top and the bottom of the base concrete layer (11), and the fiber woven net layer (13) is arranged between the high-performance fine concrete layers (12) on the two sides and the base concrete layer (11).
3. The novel heat-insulating thin-wall composite wallboard as claimed in claim 2, characterized in that: the base concrete layer (11) is made of base concrete, the high-performance fine concrete layer (12) is made of high-performance fine concrete, and the high-performance fine concrete comprises the following mixture of components in percentage by mass: cement, flyash, silica fume, water, river sand and water reducing agent in the weight ratio of 1 to 0.200 to 0.069 to 0.229 to 1.100 to 0.026, and the woven fiber net is alkali resisting glass fiber net.
4. The novel heat-insulating thin-wall composite wallboard as claimed in claim 3, wherein: the high-performance fine concrete layer (12) is also added with chopped glass fiber, and the volume mixing amount of the chopped glass fiber is 1-1.5%.
5. The novel heat-insulating thin-wall composite wallboard as claimed in claim 1, wherein: the thickness of the structural layer (1) is 15-20 mm.
6. The novel heat-insulating thin-wall composite wallboard as claimed in claim 1, wherein: the heat-insulating layer (2) is made of low-density fiber reinforced sand foam concrete, and the low-density fiber reinforced sand foam concrete comprises the following mixture of components in parts by mass: cement, water, pottery sand, fine sand, foaming agent, water reducing agent, early strength agent and alkali-resistant glass fiber in the weight ratio of 1 to 0.52 to 0.06 to 0.04 to 0.0069 to 0.004 to 0.016 to 0.0108.
7. The novel heat-insulating thin-wall composite wallboard as claimed in claim 1, wherein: the thickness of the heat preservation layer (2) is 90-120 mm.
8. The novel heat-insulating thin-wall composite wallboard as claimed in claim 1, wherein: the connecting piece (3) is an FRP rib.
9. A preparation method of the novel heat-insulation thin-wall composite wallboard according to any one of claims 1-8, characterized by comprising the following steps: the method comprises the following steps:
step S1: preparing a wood mould required by the preparation of the composite wallboard, and pouring a first structural layer (1) into the wood mould, wherein the pouring method comprises the following steps: putting cement, fly ash, silica fume and river sand into a mortar mixer according to the mass ratio of the components, uniformly mixing the mixture, adding water and a water reducing agent into the mortar mixer, mixing the mixture for a period of time, doping chopped glass fibers into the mortar mixer, continuously mixing the mixture for a period of time until the materials in the mortar mixer are uniformly mixed to obtain high-performance fine concrete, pouring part of the high-performance fine concrete into a wood mould to be paved and leveled to form a first high-performance fine concrete layer (12), paving a first fiber woven mesh layer (13) on the first high-performance fine concrete layer (12), pouring base concrete into the wood mould to be paved and leveled to form a base concrete layer (11) on the first high-performance fine concrete layer (12), paving a second fiber woven mesh layer (13) on the base concrete layer (11), then pouring the residual high-performance fine concrete into the wood mould, paving and leveling to form a second high-performance fine concrete layer (12) on the matrix concrete layer (11), and finally, troweling and compacting the concrete in the wood mould;
step S2: pouring a heat preservation layer (2) on a first structural layer (1) in the wood mould, wherein the pouring method comprises the following steps: adding cement, fine sand and ceramic sand into a mortar stirrer according to the mass ratio of the components, dry-stirring the mixture into powder by the stirrer, then uniformly mixing water, an early strength agent and a water reducing agent, then adding the mixture into the mortar stirrer, preparing a foaming agent into foam through a foaming machine according to the mass ratio of the components, then adding the foam into the mortar stirrer, stirring the foam until the mixture is uniform, then adding alkali-resistant glass fibers into the mortar stirrer, stirring the mixture for a period of time until the materials in the mortar stirrer are uniformly mixed, thus obtaining low-density fiber reinforced sand foam concrete, pouring the low-density fiber reinforced sand foam concrete into a wood mold, paving and leveling the low-density fiber reinforced sand foam concrete to form a heat insulation layer (2) on a first structural layer (1), and finally leveling the concrete in the wood mold;
step S3: arranging a connecting piece (3) in the wood mould, wherein the arranging method comprises the following steps: vertically inserting the connecting piece (3) into the wood mould, inserting the connecting piece (3) into the structural layer (1) after penetrating through the heat-insulating layer (2), and reserving a certain length to ensure that the top of the connecting piece (3) can extend out of the top of the heat-insulating layer (2);
step S4: curing the first structural layer (1) and the heat-insulating layer (2) in the wood mould, and pouring the second structural layer (1) into the wood mould by using the pouring method of the structural layer (1) in the step S1 after the curing is finished, so that the heat-insulating layer (2) is sandwiched between the second structural layer and the first structural layer (1);
step S5: and (3) demolding after the two structural layers (1) and the heat preservation layer (2) in the wood mold are initially set, then performing watering maintenance, and finally placing in a dry environment for natural maintenance.
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