CN113863554B - Composite recycled concrete roof panel and preparation method thereof - Google Patents

Abstract

The invention provides a composite recycled concrete roof board which comprises a board box body, wherein the board box body is cuboid and comprises a top board, a bottom board and a plurality of side boards which are perpendicular to the top board and the bottom board and are parallel to each other, a plurality of accommodating chambers are arranged in the board box body, a mortar layer, a ventilation layer, a foam layer and a reinforcing steel layer are sequentially arranged in the accommodating chambers from top to bottom, the ventilation layer is hollow, a plurality of reinforcing steel bars in the same direction are arranged at the bottom in the reinforcing steel bars, reinforcing steel bar meshes are arranged on the reinforcing steel bars, a plurality of convex connecting pieces are arranged on the reinforcing steel bars, the upper parts of the convex connecting pieces are embedded in the foam layer, and a waterproof layer is further arranged on the upper surface of the top board. Above-mentioned roof boarding establishes the built on stilts insulating layer alone in traditional roofing and improves, reserves the ventilation layer in the concrete box template of reinforcing bar regeneration, makes the roofing structure obtain simplifying, satisfies ventilation heat dissipation demand simultaneously.

Description

Composite recycled concrete roof panel and preparation method thereof

technical field

The invention relates to the field of building materials, in particular to a composite recycled concrete roof panel.

Background technique

With the development of society and economy, my country's construction industry is in a stage of vigorous development, and the demand for building materials has increased sharply, while natural sand aggregate resources are limited, resulting in a shortage of natural resources; at the same time, a large number of buildings are demolished, resulting in a large amount of construction waste, which seriously damages the ecology environment. Therefore, recycling waste concrete and using it to partially or completely replace natural sand and gravel aggregates to prepare recycled concrete can realize the recycling of construction solid waste and meet the needs of sustainable development.

The current rural roof construction generally adopts the combination of roof brush hydrophobic layer and thermal insulation layer or a ventilated roof, an overhead layer is set on the structural layer, and the top is protected by a cement cover to achieve thermal insulation effect. There is only one heat insulation measure, that is, a single heat insulation layer for heat insulation or ventilation and heat dissipation. At the same time, the thermal conductivity of the heat insulation material used in the overhead layer is relatively large, and the actual heat insulation and energy saving effect is average. In addition, the roof construction is complicated and it is difficult to achieve integrated prefabrication.

Contents of the invention

In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a composite recycled concrete roof panel and its preparation method, which are used to solve the problems of poor thermal insulation effect and complicated process in the prior art.

In order to achieve the above purpose and other related purposes, the first aspect of the present invention provides a composite recycled concrete roof panel, which includes a panel box body, the panel box body is in the shape of a cuboid and includes a top plate, a bottom plate, and several Parallel side panels, the board box is provided with a number of accommodating chambers, and the accommodating chambers are sequentially provided with a mortar layer, a ventilation layer, a foam layer, and a steel bar layer from top to bottom, and the ventilation layer is hollow. The inner bottom of the reinforcement layer is provided with a reinforcement mesh, and the reinforcement mesh is provided with a number of reinforcing ribs in the same direction, and the reinforcement ribs are provided with a number of convex connectors, and the upper part of the convex connectors is embedded in the foam layer. The upper surface of the top board is also provided with a waterproof layer.

Preferably, any one or more of the following features are included:

1) The thickness of the top plate and the bottom plate is 50mm to 60mm;

2) The thickness of the side plate is 100mm-150mm;

3) The height of the side plate is 250mm-350mm;

4) The distance between the side plates is 750mm-1200mm;

5) the thickness of the mortar layer is 15-20mm;

6) The thickness of the foam layer is 80mm-100mm, and the thermal conductivity is 0.12-0.15W/(m·k);

7) The height of the ventilation layer is 100mm-150mm.

Preferably, any one or more of the following features are included,

1) The waterproof layer is a flexible waterproof layer;

2) The material of the mortar layer is prepared by mixing recycled fine aggregate, cement, water and zeolite powder into mortar.

Preferably, the ventilation layer has a smooth surface.

Preferably, the material of the board box is the first concrete, by weight,

190-200 parts of water;

255-263 parts of cement;

85-88 parts of fly ash;

85-88 parts of mineral powder;

595-604 parts of natural sand;

530-534 parts of recycled coarse aggregate;

530-534 parts of natural coarse aggregate;

0.4-0.45 parts of rice straw fiber.

Preferably, the foam layer is made of foam and second concrete, and the second concrete is by weight,

243-245 parts of water;

243-245 parts of cement;

81-82 parts of fly ash;

81-82 parts of zeolite powder;

435-439 parts of recycled fine aggregate;

172-175 parts of recycled micropowder;

0.4 part of rice straw fiber;

Water reducing agent: 1.2-1.5 parts.

Preferably, the length of the rice straw fibers is 10-20 mm, and the cement is ordinary Portland cement of P.O42.5.

The second aspect of the present invention provides a method for preparing a composite recycled concrete roof panel, which is characterized in that: the following steps are adopted:

1) Laying reinforcing ribs, setting convex connectors on the reinforcing ribs, laying steel mesh to form a reinforcement layer, pouring the bottom plate, setting several identical side plates vertically on the formed bottom plate, and pouring above the side plates parallel to the bottom plate a top plate forming a plurality of accommodating chambers;

2) laying a mortar layer on the top of the accommodation chamber;

3) Lay a foam layer on the reinforcement layer;

4) Repeat the above steps 2) to 3) to lay all the accommodation chambers.

As mentioned above, a composite recycled concrete roof panel of the present invention has the following beneficial effects:

(1) A composite recycled concrete roof slab provided by the present invention is improved based on the traditional roof with an overhead insulation layer, and a ventilation layer is reserved in the reinforced recycled concrete box-shaped slab to simplify the roof structure and meet the requirements of ventilation and heat dissipation need.

(2) A composite recycled concrete roof panel provided by the present invention, the foam layer and the mortar layer all have hygroscopicity. In summer, on the basis of natural ventilation and heat insulation, it can further realize moisture absorption and heat preservation at night, and sunshine evaporation and cooling during the day. Provide good thermal comfort for the interior, green and energy-saving. It is suitable for hot and humid subtropical regions, especially the southern coastal areas, and can reduce the average temperature of the inner surface of the roof by 4°C-5°C, which meets the requirements of passive energy-saving buildings.

(3) A kind of composite regenerated concrete roof panel provided by the present invention, the air vent of set foam layer is closed in winter, in dry state, thermal conductivity is small, meets basic insulation requirement; Simultaneously, closed ventilating layer forms closed cavity, further improves Insulation effect.

(4) The composite recycled concrete roof panel provided by the present invention recycles waste concrete, clay bricks and straw, which can save natural resources, reduce environmental pollution caused by construction waste, and reduce production costs.

(5) A regenerated concrete roofing panel provided by the present invention is produced by prefabricating reinforced recycled concrete box-shaped panels, hygroscopic foam recycled concrete panels, and then building a moisture-absorbing recycled mortar layer and a waterproof layer to form waterproof, heat-preserving, and load-bearing panels. Integrated composite roof panels. The construction operation is convenient, the production is fast, and the quality is high.

Description of drawings

Fig. 1 is a schematic diagram showing the structure of the composite recycled concrete roof panel of the present invention.

Fig. 2 is a partial structural schematic diagram of the composite recycled concrete roof panel of the present invention.

reference sign

1 board box

2 Top plate

3 side panels

4 Bottom plate

5 Accommodating chamber

6 Mortar layer

7 ventilation layer

8 Foam layer

9 reinforcement layer

10 reinforcement rib

11 Reinforced Mesh

12 Male connector

13 Waterproof layer

Detailed ways

The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

Please refer to Figure 1 to Figure 2. It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the present invention. Limiting conditions, so there is no technical substantive meaning, any modification of structure, change of proportional relationship or adjustment of size, without affecting the effect and purpose of the present invention, should still fall within the scope of the present invention. The disclosed technical content must be within the scope covered. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without any substantial change in the technical content.

As shown in Figure 1-2, the present invention provides a composite recycled concrete roof panel, including a panel box 1, the panel box 1 is a cuboid and includes a top panel 2, a bottom panel 4, and several panels perpendicular to the top panel 2 and the bottom panel 4 And the side plates 3 parallel to each other, the board box body 1 is provided with a number of accommodation chambers 5, and the accommodation chambers 5 are sequentially provided with a mortar layer 6, a ventilation layer 7, and a foam layer 8 from top to bottom, Reinforcement layer 9, the ventilation layer 7 is hollow, and the inner bottom of the reinforcement layer 9 is provided with several reinforcing ribs 10 in the same direction. Type connector 12, the upper part of the male connector 12 is embedded in the foam layer 8, and the upper surface of the top board 2 is also provided with a waterproof layer 13.

In the composite recycled concrete roof panel provided by the present invention, a board box body 1 is included, and the board box body 1 is a cuboid and includes a top board 2, a bottom board 4 and several side boards 3 perpendicular to the top board 2 and the bottom board 4 and parallel to each other, Considering the increase in the thickness of the top plate 2) and the bottom plate 4, the maximum normal stress and deflection of the plate bottom will decrease, but the self-weight of the roof plate will increase and the hollow rate will decrease; the increase in the width of the side plate 3 can effectively reduce the stress at the bottom of the plate, but not significantly Decrease the deflection value, and at the same time the hollow ratio decreases; the height of the side plate 3 increases, the stress and deflection at the bottom of the plate decrease, and the hollow rate also increases, but the weight of the roof panel increases; the distance between the side plates 3 increases and decreases, and the stress at the bottom of the plate decreases. , deflection and hollow rate also increase, but the weight also increases. So the related parameters of top plate 2, side plate 3, bottom plate 4 are very important, in the present invention, the thickness of described top plate 2, bottom plate 4 is 50-60mm, for example, can be 50-55mm, 55-60mm, described side The thickness of plate 3 is 100-150mm, for example, can be 100-125mm, 125-150mm, and the height of described side plate 3 is 25-350mm, for example, can be 250-300mm, 300-35mm. The spacing between 3 is 750-1200mm, for example, can be, 750-80mm 0, 800-85mm 0, 850-90mm 0, 900-950mm, 950-1000mm, 1050-1100mm, 1100-1150mm, 1150-1200mm. Top plate 2, bottom plate 4, and side plate 3 are all provided with reinforcing bar among the present invention, to improve its intensity.

The material of the panel box 1 in the present invention is the first concrete, which is prepared by using 50%-100% recycled coarse aggregate instead of natural coarse aggregate. The recycled coarse aggregate is regenerated from waste concrete, and the fine aggregate is natural sand. The recycled coarse aggregate used is recycled aggregate obtained from waste concrete, soaked in diluted organic silicon solution, dried at 50°C-60°C, and prepared after improving the surface condition of the aggregate. Specifically, the material of the board box 1 is calculated by weight: 190-200 parts of water; 255-263 parts of cement; 85-88 parts of fly ash; 85-88 parts of mineral powder; 595-604 parts of natural sand; 530-534 parts of coarse aggregate; 530-534 parts of natural coarse aggregate; 0.4-0.45 parts of rice straw fiber, the length of the rice straw fiber is 10-20 mm, the length of the steel slag is 5-10 mm, the cement Ordinary Portland cement with P.O42.5.

In the composite recycled concrete roof panel provided by the present invention, the board box body 1 is provided with a number of accommodation chambers 5, and the accommodation chambers 5 are sequentially provided with a mortar layer 6, a ventilation layer 7, a foam Layer 8, reinforcement layer 9. Comprehensively considering the stress and deformation of the composite roof panel, the self-weight of the roof panel, and the hollow rate index, the thickness of the mortar layer 6 is 15-20mm, for example, it can be 15-16mm, 16-17mm, 17-18mm, 18-19mm, 19-20mm, the surface of the mortar layer 6 should be smooth to ensure smooth ventilation, thereby reducing frictional resistance and ensuring smoother airflow. The material of the mortar layer 6 is prepared by mixing recycled fine aggregate, cement, water and zeolite powder into mortar. More preferably, the zeolite powder mixed in the mortar layer 6 is modified by salt heat. The specific salt heat modification treatment method is as follows: firstly, it is treated in calcium chloride with a salt concentration of 25% saturated salt solution to increase the chemical adsorption capacity of zeolite powder and water, and at the same time change the pore size structure of zeolite powder through ion exchange, so that the humidity can be adjusted The performance is changed; then heated at 200±5°C for 1-1.5h to remove impurities such as water molecules and carbonates inside the zeolite powder, increase its specific surface area, improve the adsorption performance of zeolite, and comprehensively make the modified The maximum moisture absorption of zeolite powder is 6.4-7 times that of natural zeolite powder, and the maximum moisture release is 7-8 times that of natural zeolite powder. More preferably, the salt-heat modified zeolite powder replaces 30% cement and mixes it into mortar to make a zeolite-based humidity control material. Such a mortar layer 6 can meet the requirement of nighttime moisture absorption rate, and realize moisture absorption and evaporation during the day to take away enough heat from the roof panel.

The height of the ventilation layer 7 is 100-150mm, for example, can be 100-125mm, 125-150mm, to meet the flow requirements of the basic air, the board length of the composite roof panel should not exceed 10m, to meet the requirements of the air duct. Require. More preferably,

The thickness of described foam layer 8 is 80-100mm, for example, can be 80-85mm, 85-90mm, 90-95mm, 95-100mm, thermal conductivity 0.12-0.15W/(m.k), for example, can be 012 -0.13W/(m.k), 0.13-0.14W/(m.k), 0.14-0.15W/(m.k). The foam layer 8 is made of foam and second concrete, and the second concrete is 243-245 parts by weight of water; 243-245 parts of cement; 81-82 parts of fly ash; 81-82 parts of zeolite powder 435-439 parts of recycled fine aggregate; 172-175 parts of recycled fine powder; 0.4 parts of rice straw fiber; 1.2-1.5 parts of water reducer. The cement is ordinary Portland cement of P.O42.5, the length of the rice straw fiber is 10-20mm, and the water reducer is polycarboxylate high-efficiency water reducer. The steel bar at the bottom of the board, the zeolite powder in the foam layer 8 is modified by heating, heated at 200±5°C for 1-1.5h, the maximum moisture absorption is 1.765-2 times that of natural zeolite powder, and the fiber length of rice straw is 10mm~ 20mm. In this formula, heat-modified zeolite powder is used instead of part of cement and mixed into mortar to make zeolite-based humidity-conditioning material to improve hygroscopicity. The foam layer 8 has hygroscopicity. In summer, the air vents are open, and the air flow is smooth, so as to realize moisture absorption and heat preservation at night, and evaporation and cooling of water vapor during the day. The air vent is closed in winter, and the foam layer 8 absorbs moisture again, and utilizes its porosity and the cavity formed by the airtight ventilation layer 7 to play a double thermal insulation effect. The material of the foam layer 8 is prepared by replacing natural fine aggregate with 100% recycled fine aggregate, and the recycled fine aggregate is regenerated from waste clay bricks. The foam layer 8 is foamed under air pressure to ensure fine foam and increase the airtight void ratio. Satisfied with porous light weight, but relatively higher strength. In the foam layer 8 , rice straw and plant fibers are added to improve the hygroscopicity and at the same time enhance the crack resistance.

In the present invention, the inner bottom of the reinforcement layer 9 is provided with several reinforcing ribs 10 in the same direction. The connecting piece 12 can be a convex galvanized steel connecting piece, the convex connecting piece 12 passes through the steel mesh 11 structure, and the upper part of the convex connecting piece 12 is embedded in the foam layer 8 .

In the composite recycled concrete roof panel provided by the present invention, the upper surface of the top plate 2 is also provided with a waterproof layer 13, the waterproof layer 13 is a flexible waterproof layer, and the flexible waterproof layer is made of a waterproof material with certain flexibility and greater elongation. , such as the waterproof layer 13 made of waterproof coiled material and organic waterproof coating, its thickness is 8-12mm, for example, can be 8-10mm, 10-12mm.

Example 1

A composite recycled concrete roof panel includes a board box body 1, the board box body 1 is a cuboid and includes a top board 2, a bottom board 4 and several side boards 3 perpendicular to the top board 2 and the bottom board 4 and parallel to each other, the bottom board 4 And cover plate thickness is 50mm, and side plate 3 thickness is 120mm, and side plate 3 height is 200mm, and the interval between adjacent side plates 3 is 1000mm, and described board box body 1 is provided with a plurality of accommodating chambers 5, so The accommodating chamber 5 is sequentially provided with a mortar layer 6, a ventilation layer 7, a foam layer 8, and a reinforcement layer 9 from top to bottom. The thickness of the mortar layer 6 is 20mm, and 30% salt is mixed in the mortar layer 6. Modified zeolite powder-based humidity control material, the ventilation layer 7 is hollow, the thickness of the ventilation layer 7 is 100mm, and the inner bottom of the reinforcement layer 9 is provided with several reinforcing ribs 10 in the same direction, and the reinforcing ribs 10 are provided with Reinforced mesh 11, the reinforcing rib 10 is provided with several convex connectors 12, the upper part of the convex connectors 12 is embedded in the foam layer 8, the thickness of the foam layer 8 is 80mm, and the upper surface of the top plate 2 is also A waterproof layer 13 is provided, and the thickness of the waterproof layer 13 is 8 mm.

The preparation method of the board box 1 material is as follows: the recycled aggregate obtained from waste concrete is soaked in a chemical strengthening solvent such as a diluted organic silicon solution or a polymer PVA, and then dried at 50°C-60°C to improve the aggregate After the surface condition, prepare and generate Class I recycled coarse aggregate to replace 50% of the coarse aggregate; use natural sand as the fine aggregate; add silica fume and other admixtures to improve compactness; the bottom plate 4 is mixed with rice straw fiber to improve crack resistance properties, the specific mix design of the first concrete is as follows in parts by weight:

195 parts of water;

260 parts of cement;

87 parts of fly ash;

87 parts of mineral powder;

600 parts of natural sand;

532 parts of recycled coarse aggregate;

532 parts of natural coarse aggregate;

Rice straw fiber 0.4.

The preparation method of the foam layer material is as follows: 100% recycled fine aggregate and recycled fine powder are used to replace natural aggregates, and the recycled fine aggregate is regenerated from waste clay bricks with high clay content. By adopting air pressure foaming, the foam is fine and dense, and the airtight void ratio is improved. Satisfied with porous light weight, but relatively higher strength. Among them, rice straw is added, and the plant fiber improves the hygroscopicity and at the same time enhances the crack resistance. The heat-modified zeolite powder is used to replace part of the cement and mix into the mortar to make a zeolite-based humidity-conditioning material to improve the hygroscopic performance.

The specific mix ratio is designed as:

Ordinary Portland cement with P.O42.5 is used.

by weight,

244 parts of water;

244 parts of cement;

81 parts of fly ash;

81 parts of zeolite powder;

437 parts of recycled fine aggregate;

173 parts of recycled micropowder;

0.4 part of rice straw fiber;

Polycarboxylate superplasticizer: 1.3 parts.

The preparation method of the composite recycled concrete roof panel is as follows:

1) Laying reinforcing ribs, setting convex connectors on the reinforcing ribs, laying steel mesh to form a reinforcement layer, pouring the bottom plate, setting several identical side plates vertically on the formed bottom plate, and pouring above the side plates parallel to the bottom plate a top plate forming a plurality of accommodating chambers;

2) laying a mortar layer on the top of the accommodation chamber;

3) Lay a foam layer on the reinforcement layer;

4) Repeat the above steps 2) to 3) to lay all the accommodation chambers.

The open air vent of the present invention can make the average temperature of the inner surface of the roof 4.0°C-4.5°C lower than that of the ordinary roof, and has a remarkable effect of moisture absorption and evaporation cooling; the closed air vent, in a dry state, has a thermal conductivity of 0.12-0.15W/(m·K ) to meet the basic insulation requirements.

Example 2

A composite recycled concrete roof panel includes a board box body 1, the board box body 1 is a cuboid and includes a top board 2, a bottom board 4 and several side boards 3 perpendicular to the top board 2 and the bottom board 4 and parallel to each other, the bottom board 4 And cover plate thickness is 50mm, and side plate 3 thickness is 120mm, and side plate 3 height is 220mm, and the interval between adjacent side plates 3 is 1000mm, and described board box body 1 is provided with a plurality of accommodating chambers 5, so The accommodating chamber 5 is sequentially provided with a mortar layer 6, a ventilation layer 7, a foam layer 8, and a reinforcement layer 9 from top to bottom. The thickness of the mortar layer 6 is 20mm, and 30% salt is mixed in the mortar layer 6. Modified zeolite powder-based humidity control material, the ventilation layer 7 is hollow, the thickness of the ventilation layer 7 is 100mm, and the inner bottom of the reinforcement layer 9 is provided with several reinforcing ribs 10 in the same direction, and the reinforcing ribs 10 are provided with Reinforced mesh 11, the reinforcing rib 10 is provided with several convex connectors 12, the upper part of the convex connectors 12 is embedded in the foam layer 8, the thickness of the foam layer 8 is 80mm, and the upper surface of the top plate 2 is also A waterproof layer 13 is provided, and the thickness of the waterproof layer 13 is 8 mm.

The preparation method of the board box 1 material is as follows: the recycled aggregate obtained from waste concrete is soaked in a chemical strengthening solvent such as a diluted organic silicon solution or a polymer PVA, and then dried at 50°C-60°C to improve the aggregate After the surface condition, prepare and generate Class I recycled coarse aggregate to replace 50% of the coarse aggregate; use natural sand as the fine aggregate; add silica fume and other admixtures to improve compactness; the bottom plate 4 is mixed with rice straw fiber to improve crack resistance properties, the specific mix design of the first concrete is as follows in parts by weight:

195 parts of water;

260 parts of cement;

87 parts of fly ash;

87 parts of mineral powder;

600 parts of natural sand;

532 parts of recycled coarse aggregate;

532 parts of natural coarse aggregate;

Rice straw fiber 0.4.

The material preparation method of the foam layer 8) is as follows: 100% recycled fine aggregate and recycled fine powder are used to replace natural aggregates. The recycled fine aggregate is regenerated from waste clay bricks and has a high clay content. By adopting air pressure foaming, the foam is fine and dense, and the airtight void ratio is improved. Satisfied with porous light weight, but relatively higher strength. Among them, rice straw is added, and the plant fiber improves the hygroscopicity and at the same time enhances the crack resistance. The heat-modified zeolite powder is used to replace part of the cement and mix into the mortar to make a zeolite-based humidity-conditioning material to improve the hygroscopic performance.

The specific mix ratio is designed as:

Ordinary Portland cement with P.O42.5 is used.

by weight,

244 parts of water;

244 parts of cement;

81 parts of fly ash;

81 parts of zeolite powder;

437 parts of recycled fine aggregate;

173 parts of recycled micropowder;

0.4 part of rice straw fiber;

Polycarboxylate superplasticizer: 1.3 parts.

The preparation method of the composite recycled concrete roof panel is as follows:

1) Laying reinforcing ribs, setting convex connectors on the reinforcing ribs, laying steel mesh to form a reinforcement layer, pouring the bottom plate, setting several identical side plates vertically on the formed bottom plate, and pouring above the side plates parallel to the bottom plate a top plate forming a plurality of accommodating chambers;

2) laying a mortar layer on the top of the accommodation chamber;

3) Lay a foam layer on the reinforcement layer;

4) Repeat the above steps 2) to 3) to lay all the accommodation chambers.

The open vent of the present invention can make the average temperature of the inner surface of the roof 4.2°C-4.5°C lower than that of the common roof, and has a significant effect of moisture absorption and evaporation cooling; the closed vent, in a dry state, has a thermal conductivity of 0.12-0.15W/(m·K ) to meet the basic insulation requirements.

Example 3

A composite recycled concrete roof panel includes a board box body 1, the board box body 1) is a cuboid and includes a top board 2, a bottom board 4 and several side boards 3 perpendicular to the top board 2 and the bottom board 4 and parallel to each other, the bottom board 4 and the thickness of the cover plate is 50mm, the thickness of the side plate 3 is 120mm, the height of the side plate 3 is 220mm, and the interval between adjacent side plates 3 is 1000mm, the board box 1 is provided with a number of accommodation chambers 5, The accommodating chamber 5 is sequentially provided with a mortar layer 6, a ventilation layer 7, a foam layer 8, and a reinforcement layer 9 from top to bottom. The thickness of the mortar layer 6 is 20mm, and 30% of Saline modified zeolite powder-based humidity control material, the ventilation layer 7 is hollow, the thickness of the ventilation layer 7 is 100mm, and the inner bottom of the reinforcement layer 9 is provided with several reinforcing ribs 10 in the same direction, and the reinforcing ribs 10 are provided with There is a steel mesh 11, and several convex connectors 12 are arranged on the reinforcing rib 10, and the upper part of the convex connectors 12 is embedded in the foam layer 8, and the thickness of the foam layer 8 is 100mm, and the upper surface of the top plate 2 A waterproof layer 13 is also provided, and the thickness of the waterproof layer 13 is 8 mm.

The preparation method of the board box 1 material is as follows: the recycled aggregate obtained from waste concrete is soaked in a chemical strengthening solvent such as a diluted organic silicon solution or a polymer PVA, and then dried at 50°C-60°C to improve the aggregate After the surface condition, prepare and generate Class I recycled coarse aggregate to replace 50% of the coarse aggregate; use natural sand as the fine aggregate; add silica fume and other admixtures to improve compactness; the bottom plate 4 is mixed with rice straw fiber to improve crack resistance properties, the specific mix design of the first concrete is as follows in parts by weight:

195 parts of water;

260 parts of cement;

87 parts of fly ash;

87 parts of mineral powder;

600 parts of natural sand;

532 parts of recycled coarse aggregate;

532 parts of natural coarse aggregate;

0.4 part of rice straw fiber.

The preparation method of the material of the foam layer 8 is as follows: 100% recycled fine aggregate and recycled fine powder are used to replace natural aggregates, and the recycled fine aggregate is regenerated from waste clay bricks with high clay content. By adopting air pressure foaming, the foam is fine and dense, and the airtight void ratio is improved. Satisfied with porous light weight, but relatively higher strength. Among them, rice straw is added, and the plant fiber improves the hygroscopicity and at the same time enhances the crack resistance. The heat-modified zeolite powder is used to replace part of the cement and mix into the mortar to make a zeolite-based humidity-conditioning material to improve the hygroscopic performance.

The specific mix ratio is designed as:

Ordinary Portland cement with P.O42.5 is used.

by weight,

244 parts of water;

244 parts of cement;

81 parts of fly ash;

81 parts of zeolite powder;

437 parts of recycled fine aggregate;

173 parts of recycled micropowder;

0.4 part of rice straw fiber;

Polycarboxylate superplasticizer: 1.3 parts.

The preparation method of the composite recycled concrete roof panel is as follows:

1) Laying reinforcing ribs, setting convex connectors on the reinforcing ribs, laying steel mesh to form a reinforcement layer, pouring the bottom plate, setting several identical side plates vertically on the formed bottom plate, and pouring above the side plates parallel to the bottom plate a top plate forming a plurality of accommodating chambers;

2) laying a mortar layer on the top of the accommodation chamber;

3) Lay a foam layer on the reinforcement layer;

4) Repeat the above steps 2) to 3) to lay all the accommodation chambers.

Open vents can make the average temperature of the inner surface of the roof 4.3°C-4.7°C lower than that of ordinary roofs, which has a significant effect of moisture absorption and evaporation cooling; closed vents, in a dry state, the thermal conductivity is 0.12-0.15W/(m K) meets the basic requirements Insulation requirements.

The open air vent of the present invention can make the average temperature of the inner surface of the roof 4.0°C-4.5°C lower than that of the ordinary roof, and has a remarkable effect of moisture absorption and evaporation cooling; the closed air vent, in a dry state, has a thermal conductivity of 0.12-0.15W/(m·K ) to meet the basic insulation requirements.

To sum up, the present invention effectively overcomes various shortcomings in the prior art and has high industrial application value.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (6)

1. a composite recycled concrete roof panel, is characterized in that, comprises plate box (1), and described plate box (1) is cuboid and comprises top plate (2), base plate (4) and some perpendicular to top plate ( 2) and the bottom plate (4) and side plates (3) parallel to each other, the board box (1) is provided with a number of accommodation chambers (5), and the accommodation chambers (5) are arranged from top to bottom A mortar layer (6), a ventilation layer (7), a foam layer (8), and a reinforcement layer (9) are provided in sequence, the ventilation layer (7) is hollow, and a number of codirectional The reinforcing rib (10), the reinforcing rib (10) is provided with a steel mesh (11), the reinforcing rib (10) is provided with several convex connectors (12), and the convex connector (12 ) is embedded in the foam layer (8), and the upper surface of the top plate (2) is also provided with a waterproof layer (13), and the waterproof layer (13) is a flexible waterproof layer; the material of the board box (1) is the first concrete, in parts by weight, 190-200 parts of water; 255-263 parts of cement; 85-88 parts of fly ash; 85-88 parts of mineral powder; 595-604 parts of natural sand; 530-534 parts of recycled coarse aggregate; 530-534 parts of natural coarse aggregate; 0.4-0.45 parts of rice straw fiber; The foam layer (8) is made of foam and second concrete. The second concrete adopts heat-modified zeolite powder instead of part of cement and mixes it into mortar to make a zeolite-based humidity-controlling material to improve the hygroscopic performance. The second concrete is as follows: parts by weight, 243-245 parts of water; 243-245 parts of cement; 81-82 parts of fly ash; 81-82 parts of zeolite powder; 435-439 parts of recycled fine aggregate; 172-175 parts of recycled micropowder; 0.4 part of rice straw fiber; Water reducing agent: 1.2-1.5 parts; The material of the mortar layer (6) is prepared by mixing recycled fine aggregate, cement, water and zeolite powder into mortar; The mortar layer (6) uses salt heat modified zeolite powder instead of 30% cement and mixes it into mortar to make a zeolite-based humidity control material, which meets the nighttime moisture absorption requirement of the mortar layer; Both the foam layer and the mortar layer have hygroscopicity. In summer, on the basis of natural ventilation and heat insulation, it can further realize moisture absorption and heat preservation at night, and sunshine evaporation and cooling during the day, comprehensively providing good thermal comfort for the interior, green and energy-saving. 2. The composite recycled concrete roof panel according to claim 1, characterized in that it includes any one or more of the following features: 1) The thickness of the top plate (2) and the bottom plate (4) is 50 mm to 60 mm; 2) The thickness of the side plate (3) is 100mm-150mm; 3) The height of the side plate (3) is 250mm-350mm; 4) The distance between the side plates (3) is 750mm-1200mm; 5) The thickness of the mortar layer (6) is 15-20mm; 6) The thickness of the foam layer (8) is 80mm-100mm, and the thermal conductivity is 0.12-0.15w/(m·k); 7) The height of the ventilation layer (7) is 100mm-150mm. 3. The composite recycled concrete roof panel according to claim 1, characterized in that the ventilation layer (7) has a smooth surface. 4. The composite recycled concrete roof panel according to claim 1, characterized in that: the length of the rice straw fibers is 10-20 mm. 5. The composite recycled concrete roof panel according to claim 1, characterized in that: the length of the steel slag is 5-10mm. 6. A preparation method for a composite recycled concrete roof panel, characterized in that: the following steps are adopted: 1) Laying reinforcing ribs, setting convex connectors on the reinforcing ribs, laying steel mesh to form a reinforcement layer, pouring the bottom plate, setting several identical side plates vertically on the formed bottom plate, and pouring above the side plates parallel to the bottom plate a top plate forming a plurality of accommodating chambers; 2) laying a mortar layer on the top of the accommodation chamber; 3) Lay a foam layer on the reinforcement layer; 4) Repeat the above steps 2) to 3) to lay all the accommodation chambers.

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