CN108147753B - Recycled concrete, assembled composite wallboard and preparation method thereof - Google Patents

Recycled concrete, assembled composite wallboard and preparation method thereof Download PDF

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CN108147753B
CN108147753B CN201810140404.9A CN201810140404A CN108147753B CN 108147753 B CN108147753 B CN 108147753B CN 201810140404 A CN201810140404 A CN 201810140404A CN 108147753 B CN108147753 B CN 108147753B
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layer
parts
grade
water
concrete
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CN108147753A (en
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史红彬
马志强
陈�光
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Sany Construction Technology Co Ltd
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Sany Construction Technology Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/26Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups
    • E04C2/284Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating
    • E04C2/288Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating composed of insulating material and concrete, stone or stone-like material

Abstract

The invention provides recycled concrete, an assembled composite wallboard and a preparation method thereof. The recycled concrete is mainly prepared from the following materials: by weight, 70-90 parts of cement, 3-6 parts of fly ash, 10-15 parts of slag, 200-250 parts of construction waste, 0.6-1 part of water reducing agent, 0.08-0.12 part of defoaming agent, 0.06-0.1 part of water-retaining agent, 0.2-0.4 part of retarder and 30-50 parts of water. Compared with the existing powder concrete, the compressive strength of the recycled concrete is improved, the performances such as density, heat conductivity coefficient and the like at least can reach the same level as the existing recycled concrete, the self weight of the wallboard can be reduced, and the colorful decorative effect is shown.

Description

Recycled concrete, assembled composite wallboard and preparation method thereof
Technical Field
The invention relates to the technical field of building materials, in particular to recycled concrete, an assembled composite wallboard and a preparation method thereof.
Background
At present, building energy consumption is parallel to industrial energy consumption and traffic energy consumption and becomes three major energy consumption households in China, and the building energy consumption (including construction energy consumption, living energy consumption, heating and air conditioning and the like) accounts for about 30% of the total social energy consumption, wherein the most important energy consumption is heating and air conditioning, and accounts for 20%. Therefore, the construction technology of building wall heat insulation is ready to be carried out, but in recent years, fire accidents caused by poor flame retardant property of wall heat insulation materials are continuous, and serious loss is caused to lives and properties of the nation and people, so that the selection of a wall heat insulation material which can meet the energy-saving requirement and is flame retardant is very important.
The prefabricated concrete structure is a main body structure which is formed by assembling concrete components in a reliable connection mode, and comprises a fully-assembled concrete structure, an assembled integral concrete structure and the like, all or part of the structural components are prefabricated in a factory and installed on site, and the prefabricated concrete structure is used as a structural form which accords with an industrial production mode and has the advantages of high construction speed, low labor intensity, less noise pollution and wet operation, easily controllable quality and the like. The popularization of the prefabricated concrete structure can greatly reduce the energy consumption generated in the building process, and the heat preservation and insulation treatment of the enclosure structure has great significance for reducing the energy consumption of building operation. A large number of sandwich heat-insulating integrated wall plates can be used in the propelling process of the fabricated concrete building. The sandwich wall board consists of inner leaf wall board, heat insulating board and leaf wall board. The heat-insulating layer with corresponding thickness is designed between the inner wall plate and the wall plate according to the energy-saving standard, and is connected with the inner wall plate and the leaf wall plate through special connecting pieces.
The regenerated concrete is prepared by crushing, cleaning and grading waste concrete blocks, mixing the crushed, cleaned and graded waste concrete blocks with a grading agent according to a certain proportion, partially or completely replacing natural aggregates (mainly coarse aggregates) such as sand stones and the like, and adding cement, water and the like. The recycled concrete is considered to be one of the best choices for manufacturing the fabricated composite wallboard because the recycled concrete can recycle part of waste industrial products or garbage and has low cost, but the compression strength of the existing recycled concrete is insufficient, so that the application range of the existing recycled concrete is limited. The strength grades of recycled concrete used in patent application CN103541462A, for example, can only reach C35.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide recycled concrete, the compressive strength of which is improved compared with the existing powder concrete, the performances such as density, heat conductivity coefficient and the like at least can reach the same level as the existing recycled concrete, the dead weight of the wallboard can be reduced, and the colorful decorative effect can be shown.
The second purpose of the invention is to provide the fabricated composite wallboard made of the recycled concrete, and the fabricated composite wallboard has the excellent characteristics of low cost, ultra-light and ultra-thin property, high-efficiency heat preservation, large bearing capacity and the like.
The third purpose of the invention is to provide the preparation method of the fabricated composite wallboard, which has the advantages of simple process, low technical requirement and easy industrial production.
In order to achieve the above purpose, the invention provides the following technical scheme:
the recycled concrete is mainly prepared from the following materials:
by weight, 70-90 parts of cement, 3-6 parts of fly ash, 10-15 parts of slag, 200-250 parts of construction waste, 0.6-1 part of water reducing agent, 0.08-0.12 part of defoaming agent, 0.06-0.1 part of water-retaining agent, 0.2-0.4 part of retarder and 30-50 parts of water.
Compared with the prior art, the compressive strength of the recycled concrete is improved, the compressive strength can reach more than 46.6MPa in 28 days, the density is not improved, and the density is kept at 1980kg/cm3The following.
The formula of the recycled concrete can be further improved, and the concrete is as follows.
Preferably, the cement is ordinary portland cement, with one or a mixture of both of strength grades 42.5 or 42.5R;
preferably, the fly ash grade is one or a mixture of grade I and grade II;
preferably, the slag grade is one or a mixture of S95 grade or S105 grade;
preferably, the construction waste is one or a mixture of waste concrete or waste bricks, and the particle size is less than or equal to 20 mm;
preferably, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent;
preferably, the defoaming agent is one or a mixture of silicone oil defoaming agents and ether defoaming agents;
preferably, the water retaining agent is one or a mixture of hydroxypropyl methyl cellulose ether and methyl cellulose ether;
preferably, the retarder is one or a mixture of more of sodium gluconate, tartaric acid and boric acid.
All of the above recycled concrete of the present invention can be used for any part of any building as long as its performance satisfies a predetermined requirement. The invention lists one of the uses of the recycled concrete as a decorative protective layer of a fabricated composite wallboard, and the fabricated composite wallboard has the following specific structure:
the assembled composite wallboard sequentially comprises a first decorative protective layer, a reinforcing layer, a second decorative protective layer, a vacuum heat insulation board layer and a structural layer;
the first decorative protective layer and the second decorative protective layer are both made of the recycled concrete.
The composite wallboard utilizes the advantages of the recycled concrete, and also has the following advantages:
1. the first decorative protective layer, the enhancement layer, the second decorative protective layer, the vacuum heat insulation plate layer and the structural layer are integrated into a whole, five materials make good use of the advantages and avoid the disadvantages, and the effect of integration of characteristics such as light weight, high heat preservation, fire prevention, high strength and high thermal engineering is achieved.
2. The reinforcing layer is inserted into the decorative protective layer and has the characteristics of high strength, light weight and thinness, so that the bearing property of the wallboard is not required to be increased by increasing the thickness of the decorative protective layer, and the phenomena that an excessively thick decorative layer is easy to crack, seep water and the like are avoided. In addition, the reinforcing layer also effectively blocks sharp pricking force from the outside, thereby avoiding the damage of the pricking force to the vacuum insulation panel.
3. The vacuum heat insulation plate is used as the heat insulation layer, and has the advantages of fire resistance, low heat conductivity coefficient, no toxicity and the like. Particularly, the vacuum insulation panel is a novel energy-saving heat insulation material, and on one hand, the convection effect can be effectively eliminated by utilizing the vacuum insulation principle; on the other hand, through the optimized selection of the core material, the heat conduction is controlled at a reasonable level, and the heat radiation can be effectively reduced. The vacuum heat insulation plate combines two methods of vacuum heat insulation and micropore heat insulation, so that the heat insulation effect and the purpose of heat insulation and energy saving are achieved more ideally. On the other hand, under the same heat preservation performance, compared with other heat preservation materials, the thickness of the heat preservation layer can be saved by at least 60%.
The following materials are preferably used for each layer in the above composite wallboard.
Preferably, the reinforcing layer is a high-strength fiber mesh cloth or a steel wire mesh.
The high-strength fiber mesh cloth is provided with alkali-resistant glass fiber mesh cloth, basalt fiber mesh cloth and other materials.
Preferably, the structural layer is a reinforced concrete layer.
Preferably, the vacuum insulation panel layer is formed by splicing a plurality of vacuum insulation panels in a staggered manner.
The staggered joint paving can avoid the problems of easy water seepage, shortened building service life and the like caused by the formation of a heat bridge.
In addition, the heat-insulating layer is formed by splicing a plurality of small vacuum heat-insulating plates, so that the problem of reduced heat-insulating effect caused by cutting of large vacuum heat-insulating plates can be solved.
Preferably, the staggered distance of the staggered splicing is more than 150 mm.
The problem of thermal bridge can be effectively avoided only by the long enough staggered joint distance.
Preferably, the width of each slit in the staggered splice is below 10 mm.
If the gap is too wide, the heat-insulating effect drops suddenly, so that it is recommended that the gap width does not exceed 10 mm.
Preferably, a connecting piece is arranged in a gap in the vacuum heat insulation plate layer and is connected with the first decorative protective layer, the reinforcing layer, the second decorative protective layer and the structural layer.
Each layer of wallboard is linked together to the connecting piece, increases the firmness of wallboard, increases its bearing capacity simultaneously.
Preferably, gaps between the vacuum insulation panels are filled with polyester foam or thermal mortar.
The polyester foam or the thermal mortar has low heat conductivity coefficient and good thermal insulation effect, and other materials with better thermal insulation effect can be adopted.
Preferably, the thicknesses of the first decorative protection layer and the second decorative protection layer are 25-40 mm and 25-40 mm respectively, the thickness of the vacuum insulation plate layer is 10-20 mm, and the thickness of the structural layer is 160-220 mm.
If each layer of the wallboard adopts the thickness, the thermal property and the bearing property of the wallboard are well balanced, namely the wallboard can be used as a bearing wall and has good heat insulation property.
Preferably, the second decorative protection layer is bonded with the vacuum heat insulation plate layer through an interface mortar layer, and the vacuum heat insulation plate layer is bonded with the structural layer through the interface mortar layer.
The interface mortar has stronger adhesive force, and the adhesive strength of the vacuum insulation panel, the decorative protective layer and the structural layer can be effectively ensured by spraying the interface mortar on the two surfaces of the vacuum insulation panel layer.
Preferably, the strength grade of the reinforced concrete layer is more than C30, and the density is preferably 1500-1700 kg/m3
The reinforced concrete meeting the grade has good bearing performance, can transfer the load of the decorative protective layer to the main body structure, has lower density compared with the traditional concrete, can reduce the weight by at least 30 percent, and has the advantage of light weight.
Specifically, the following formulation may be employed:
preferably, the reinforced concrete layer is mainly made of the following materials: 50-60 parts of cement, 3-10 parts of fly ash, 10-20 parts of slag, 60-80 parts of steel slag, 50-60 parts of ceramsite, 0.05-0.15 part of water-retaining agent, 0.1-0.2 part of water-reducing agent and 20-25 parts of water by weight;
preferably, the reinforced concrete layer is mainly made of the following materials: 50-55 parts of cement, 5-10 parts of fly ash, 10-15 parts of slag, 70-80 parts of steel slag, 50-55 parts of ceramsite, 0.1-0.15 part of water-retaining agent, 0.1-0.15 part of water-reducing agent and 22-25 parts of water by weight;
preferably, the cement is ordinary portland cement, with one or a mixture of both of strength grades 42.5 or 42.5R;
preferably, the fly ash grade is one or a mixture of grade I and grade II;
preferably, the slag grade is one or a mixture of S95 grade or S105 grade;
preferably, the fineness modulus of the steel slag is 3.0-3.3, and the bulk density is 1020-1080 kg/m3
Preferably, the ceramsite is fly ash ceramsite, and preferably, the particle size of the ceramsite is 5-15 mm, and the stacking density of the ceramsite is 840-870 kg/m3The cylinder pressure strength is more than or equal to 5.0 MPa.
Preferably, the water reducing agent is one of a polycarboxylic acid water reducing agent, a naphthalene water reducing agent and a melamine water reducing agent.
Preferably, the water retaining agent is hydroxypropyl methylcellulose.
All the fabricated composite wallboards of the invention can adopt the following preparation method:
step A: pouring a layer of the recycled concrete in a mold sprayed with a release agent, then paving the reinforcing layer, and then spraying another layer of the recycled concrete above the reinforcing layer to form a second decorative protective layer;
and B: before the recycled concrete of the second decorative protection layer is initially set, laying a plurality of vacuum insulation panels at staggered joints above the recycled concrete, paving the vacuum insulation panels, and filling the gaps to form an insulation layer;
and C: and pouring reinforced concrete above the heat-insulating layer to form a structural layer.
The method firstly manufactures the decorative protective layer, and then finally lays and attaches the decorative protective layer to the structural layer in the sequence of layer by layer, the preparation process does not conflict with the link of reserving the hanging ring, the embedded part, the pipeline, the electric box and the reserved hole in the wallboard, the production efficiency is high, the interference between layers is small, the product percent of pass is higher, and the wallboard structure is more stable.
Without considering the above factors, wallboard can also be made in the reverse order of the above process.
Laying a connecting piece in a gap generated when the plurality of vacuum insulation panels are laid;
preferably, rings, embedded parts, pipelines, electrical boxes and preformed holes are pre-buried between the heat-insulating layer and the structural layer.
In addition, before the step A, some pretreatment works can be carried out, such as cleaning a platform, building a side formwork and reserving a door and window hole. When spraying the recycled concrete, the recycled concrete is sprayed and vibrated at the same time so as to ensure uniform thickness.
If the vacuum insulation panel is laid before the initial setting of the recycled concrete, the recycled concrete needs to be placed for 15-20 min.
The anchoring length of the connecting piece in the single-side wall plate is not smaller than 15mm, and anti-corrosion wood bricks and vacuum heat-insulating plates are fixed on the periphery of the door and window opening to carry out bridge cut-off treatment; the device is provided with a cushion block, a steel reinforcement cage is hoisted, and a hoisting ring, an embedded part, a pipeline, an electric box, a preformed hole and the like are embedded.
After the structural layer is poured, vibrating, polishing, natural curing or steam curing, polishing, finishing, demoulding, lifting and stacking are needed.
In summary, compared with the prior art, the invention achieves the following technical effects:
(1) the recycled concrete provided by the invention has improved compressive strength, is suitable for manufacturing shear walls, can still keep lower density, and does not increase the self weight of the wall body; inorganic pigments with different textures and colors can be added to enrich the decorative effect;
(2) the wallboard disclosed by the invention can integrate the characteristics of fire prevention, heat preservation, lightness and thinness, load bearing and the like, and particularly has outstanding load bearing performance, better comprehensive performance and wider application range; the phenomena of easy cracking, water seepage, heat bridge and the like of the traditional sandwich assembly wallboard are avoided;
(3) the wallboard preparation method disclosed by the invention is simple in process and high in production efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a fabricated composite wall panel provided in embodiment 1 of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. 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. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
Manufacturing assembly type composite wallboard
(1) Cleaning the platform, building a side die, reserving a door and window opening, and spraying a release agent.
(2) Uniformly spraying recycled concrete with the thickness of 25mm, and paving and pasting the reinforcing layer; the formula of the recycled concrete is as follows: 70 g of cement, 6 g of fly ash, 10 g of slag, 250 g of construction waste, 0.6 g of a water reducing agent, 0.12 g of a defoaming agent, 0.06 g of a water retaining agent, 0.4 g of a retarder and 30 g of water, wherein the cement is ordinary portland cement, the strength grade is 42.5, the fly ash grade is I grade, the slag grade is S95 grade, the construction waste is waste concrete, the particle size is less than or equal to 20mm, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the defoaming agent is silicone oil, the water retaining agent is hydroxypropyl methyl cellulose ether, and the retarder is sodium gluconate. The enhancement layer adopts alkali-resistant glass fiber mesh cloth.
(3) And then spraying 40mm thick recycled concrete on the reinforced layer again (the formula is the same as that of the second step), and immediately placing a vacuum insulation plate (the thickness is 10mm) with both sides coated with 0.5mm thick interface agent after vibrating the decorative protective layer to be uniform in thickness. The standing time is controlled within 15-20 min, and the recycled concrete is ensured not to reach the initial setting state.
(4) When the vacuum insulation panels are paved, staggered joints are needed between the panels, the local minimum staggered joint is not less than 150mm, the vacuum insulation panels at the external corners are arranged in a staggered mode or special panels are adopted, and the width of the panel gap is not more than 10 mm.
(5) After the vacuum insulation panels are placed, gaps between the insulation panels are filled with polyurethane foam or heat insulation recycled concrete to prevent the reinforced ceramsite concrete from infiltrating downwards, connectors are embedded in advance, the anchoring length of the connectors in the single-side wall panel is not smaller than 20mm, and anti-corrosion wood bricks and the vacuum insulation panels are fixed on the periphery of the door and window opening to carry out bridge cut-off treatment.
(6) The device is provided with a cushion block, a steel reinforcement cage is hoisted, and a hoisting ring, an embedded part, a pipeline, an electric box, a preformed hole and the like are embedded.
(7) Pouring a ceramsite concrete structure layer, vibrating and polishing, wherein the thickness of the ceramsite concrete structure layer is not less than 160mm (according to JGJ3-2010 technical specification of high-rise building concrete structure, the section thickness of the shear wall is in accordance with the following regulations that the bottom reinforced part of a first-level shear wall and a second-level shear wall is not less than 200mm, other parts are not less than 160mm, the bottom reinforced part of a straight-line independent shear wall is not less than 220mm, and other parts are not less than 180 mm); the formula of the ceramsite concrete comprises the following components: 50 g of cement, 10 g of fly ash, 10 g of slag, 80 g of steel slag, 50 g of ceramsite, 0.15 g of water-retaining agent, 0.1 g of water-reducing agent and 25 g of water; the cement is ordinary portland cement, the strength grade is 42.5, and the grade of the fly ash is I grade; the slag grade is S95 grade; the steel slag has a fineness modulus of 3.0-3.3 and a bulk density of 1020-1080 kg/m3(ii) a The ceramsite is fly ash ceramsite, the particle size of the ceramsite is 5-15 mm, and the stacking density of the ceramsite is 840-870 kg/m3The cylinder pressure strength is more than or equal to 5.0 MPa; the water retention agent is hydroxypropyl methyl cellulose, and the water reducing agent is a polycarboxylic acid water reducing agent.
(8) Natural curing or steam curing, polishing, finishing, demoulding, lifting and stacking.
The structure of the wallboard manufactured in this embodiment is shown in fig. 1, and is consistent with the above method, and comprises a first decorative protective layer 1 (completed by the second step), a reinforcing layer 2, a second decorative protective layer 3 (completed by the third step), a vacuum insulation board layer 4 and a structural layer 7 which are sequentially attached; the joint 6 is arranged in the gap 5 of the vacuum insulation panel layer.
Example 2
The difference from example 1 is that the formulation of the recycled concrete used for decorating the protective layer is different from that of the recycled concrete used for decorating the protective layer, and the formulation of the recycled concrete used is as follows:
90 g of cement, 3 g of fly ash, 15 g of slag, 200 g of construction waste, 1 g of a water reducing agent, 0.08 g of a defoaming agent, 0.1 g of a water retaining agent, 0.2 g of a retarder and 50 g of water, wherein the cement is ordinary portland cement, the strength grade is one or a mixture of 42.5R, the fly ash grade is II grade, the slag grade is S105 grade, the construction waste is waste bricks, the particle size is less than or equal to 20mm, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the defoaming agent is an ether defoaming agent, the water retaining agent is methyl cellulose ether, and the retarder is boric acid.
The other steps and the construction of the panels were the same as in example 1.
Example 3
The difference from the embodiment 1 lies in that the formula of the ceramic reinforced concrete used for the structural layer is different, and the formula comprises the following components:
60 g of cement, 3 g of fly ash, 20 g of slag, 60 g of steel slag, 60 g of ceramsite, 0.05 g of water-retaining agent, 0.2 g of water-reducing agent and 20 g of water; the cement is ordinary portland cement, and the strength grade is 42.5R; the grade of the fly ash is II grade; the slag grade is S105 grade; the steel slag has a fineness modulus of 3.0-3.3 and a bulk density of 1020-1080 kg/m3(ii) a The ceramsite is fly ash ceramsite, the particle size of the ceramsite is 5-15 mm, and the stacking density of the ceramsite is 840-870 kg/m3The cylinder pressure strength is more than or equal to 5.0 MPa; the water retention agent is hydroxypropyl methyl cellulose, and the water reducing agent is a naphthalene water reducing agent.
The other steps and the construction of the panels were the same as in example 1.
Example 4
The difference from example 1 is that the thickness of each layer is different, specifically:
the thicknesses of the first layer of decorative protection layer and the second layer of decorative protection layer are respectively 30mm and 30mm, the thickness of the vacuum insulation plate layer is 20mm, and the thickness of the structural layer is 160 mm.
The other steps and the construction of the panels were the same as in example 1.
The indexes of the recycled concrete used in examples 1 and 2, such as density, compressive strength, thermal properties, etc., were also tested, and the results are shown in table 1.
TABLE 1 Properties of recycled concrete
The invention also tests the indexes of the ceramsite concrete (i.e. the material used for the structural layer) used in examples 1 and 3, such as density, compressive strength, thermal properties, etc., and the results are shown in table 2.
TABLE 2 Properties of the concretes
The wallboard of examples 1 and 4 was also tested for load bearing and insulation properties with the results shown in table 3.
TABLE 3 Properties of the wallboard
Example 1 Example 4
Coefficient of heat transfer (W/(m)2·K) 0.46 0.38
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. The assembly type composite wallboard is characterized by comprising a first decoration protective layer, a reinforcing layer, a second decoration protective layer, a vacuum heat insulation board layer and a structural layer in sequence;
the first decorative protective layer and the second decorative protective layer are both made of recycled concrete;
the recycled concrete is mainly prepared from the following materials: 70-90 parts of cement, 3-6 parts of fly ash, 10-15 parts of slag, 200-250 parts of construction waste, 0.6-1 part of water reducing agent, 0.08-0.12 part of defoaming agent, 0.06-0.1 part of water-retaining agent, 0.2-0.4 part of retarder and 30-50 parts of water by weight;
the cement is ordinary portland cement, and the strength grade of the cement is 42.5 or 42.5R or the mixture of the two;
the grade of the fly ash is one or mixture of grade I and grade II;
the slag grade is one or a mixture of S95 grade or S105 grade;
the construction waste is one or a mixture of waste concrete or waste bricks, and the particle size is less than or equal to 20 mm;
the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent;
the defoaming agent is one or a mixture of silicone oil defoaming agents and ether defoaming agents;
the water retaining agent is one or a mixture of hydroxypropyl methyl cellulose ether and methyl cellulose ether;
the retarder is one or a mixture of more of sodium gluconate, tartaric acid and boric acid;
the reinforced layer is high-strength fiber gridding cloth, and the high-strength fiber gridding cloth is alkali-resistant glass fiber gridding cloth or basalt fiber gridding cloth;
the vacuum heat insulation plate layer is formed by splicing a plurality of vacuum heat insulation plates in a staggered manner,
the staggered joint distance of the staggered joint splicing is more than 150 mm;
the width of each gap in the staggered splicing is less than 10 mm;
a connecting piece is arranged in a gap in the vacuum heat insulation plate layer and is connected with the first decorative protective layer, the reinforcing layer, the second decorative protective layer and the structural layer;
gaps among the vacuum insulation panels are filled with polyester foam or thermal insulation mortar;
the structural layer is a reinforced concrete layer, the strength grade of the reinforced concrete layer is more than C30, and the density of the reinforced concrete layer is 1500-1700 kg/m3
The reinforced concrete layer is mainly made of the following materials: 50-60 parts of cement, 3-10 parts of fly ash, 10-20 parts of slag, 60-80 parts of steel slag, 50-60 parts of ceramsite, 0.05-0.15 part of water-retaining agent, 0.1-0.2 part of water-reducing agent and 20-25 parts of water by weight;
the cement is ordinary portland cement, and the strength grade of the cement is 42.5 or 42.5R or the mixture of the two;
the grade of the fly ash is one or mixture of grade I and grade II;
the slag grade is one or a mixture of S95 grade or S105 grade;
the steel slag has a fineness modulus of 3.0-3.3 and a bulk density of 1020-1080 kg/m3
The ceramsite is coal ash ceramsite;
the ceramsite has the particle size of 5-15 mm and the bulk density of 840-870 kg/m3The cylinder pressure strength is more than or equal to 5.0 MPa;
the water reducing agent is one of a polycarboxylic acid water reducing agent, a naphthalene water reducing agent and a melamine water reducing agent;
the water-retaining agent is hydroxypropyl methyl cellulose.
2. The fabricated composite wallboard of claim 1, wherein the recycled concrete is made primarily of: by weight, 80-90 parts of cement, 3-5 parts of fly ash, 12-15 parts of slag, 200-230 parts of construction waste, 0.8-1 part of water reducing agent, 0.08-0.1 part of defoaming agent, 0.08-0.1 part of water-retaining agent, 0.2-0.3 part of retarder and 40-50 parts of water.
3. The fabricated composite wallboard according to claim 1 or 2, wherein the thicknesses of the first and second decorative protective layers are 25-40 mm and 25-40 mm respectively, the thickness of the vacuum insulation panel layer is 10-20 mm, and the thickness of the structural layer is 160-220 mm;
the second decorative protection layer is bonded with the vacuum heat insulation plate layer through an interface mortar layer, and the vacuum heat insulation plate layer is bonded with the structural layer through the interface mortar layer.
4. A method of making an assembled composite wall panel according to any one of claims 1 to 3, comprising the steps of:
step A: pouring a layer of the recycled concrete in a mold sprayed with a release agent, then paving the reinforcing layer, and then spraying another layer of the recycled concrete above the reinforcing layer to form a second decorative protective layer;
and B: before the recycled concrete of the second decorative protection layer is initially set, laying a plurality of vacuum insulation panels at staggered joints above the recycled concrete, paving the vacuum insulation panels, and filling the gaps to form an insulation layer;
and C: and pouring reinforced concrete above the heat-insulating layer to form a structural layer.
5. The manufacturing method according to claim 4, wherein a connector is laid in a gap generated when the plurality of vacuum insulation panels are laid;
the heat preservation with pre-buried rings, built-in fitting, pipeline, electric box, preformed hole between the structural layer.
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