Fabricated sandwich wallboard for building

Abstract

The invention discloses a fabricated sandwich wallboard for a building, and relates to the technical field of constructional engineering. The fabricated wallboard comprises an external hanging type non-bearing wallboard formed by sequentially arranging an EGC material inner leaf wall, an EGC material outer leaf wall, a heat preservation board and a foaming geopolymer inner core layer, the EGC material inner leaf wall, the EGC material outer leaf wall, the heat preservation board and the foaming geopolymer inner core layer are connected together through BFRP connectors, and the total thickness of the integrally-connected wallboard is 180 mm. The novel wall material fiber woven mesh, the EGC, the foaming geopolymer and the basalt fiber composite (BFRP for short) rib connecting piece are selected and organically combined with the high-quality thermal insulation material to form a sandwich structure. The problems that an existing prefabricated sandwich thermal insulation wallboard is large in self weight, prone to cracking, poor in thermal insulation effect, poor in durability, incapable of achieving light weight and the like are solved, and the prefabricated sandwich thermal insulation wallboard has the advantages of integrating multiple functions, being light in weight, resistant to cracking, resistant to shock, fireproof, capable of achieving thermal insulation and sound insulation, good in durability and the like.

Description

Technical Field

[0001] The invention relates to the technical field of assembled building engineering, and in particular to an assembled sandwich wall panel. Background Art

[0002] With the continuous development of the economy and the further expansion of urbanization, the energy loss in the construction industry has occupied an increasingly important position in the proportion of energy loss in the entire social development. Therefore, energy conservation and emission reduction work in the construction industry is particularly important.

[0003] At present, the materials used in traditional sandwich wall panels are still mainly ordinary concrete, which has a large thermal conductivity, poor insulation effect, thick wall panels, heavy weight, and the exterior wall panels are prone to cracking and falling off during use, resulting in poor durability of the wall panels and high later maintenance costs. At the same time, commonly used metal connectors are prone to thermal bridges, resulting in heat loss. Therefore, it is necessary to use new wall materials and connectors to develop a new type of sandwich insulation composite wall panel that has obvious advantages in terms of building weight, strength, thermal performance, etc., in order to solve the current problems. Summary of the invention

[0004] The object of the present invention is to provide a prefabricated sandwich wall panel for construction to solve the above-mentioned defects caused by the prior art.

[0005] The assembled sandwich wall panel for construction comprises an external non-load-bearing wall panel composed of inner and outer leaf walls of EGC material, an insulation board, and an inner core layer of foamed geopolymer arranged in sequence. The inner and outer leaf walls of EGC material, the insulation board, and the inner core layer of foamed geopolymer are connected together by a BFRP connector, and the total thickness of the wall panel connected into one is 180 mm.

[0006] The thickness of the inner and outer leaf walls of the EGC material is 20 mm.

[0007] The insulation board is made of XPS insulation board, and the thickness of the insulation board is 40mm.

[0008] The thickness of the foamed geopolymer inner core layer is 60 mm, the dry density can be controlled at 550-900 kg / m3, the thermal conductivity can be controlled at 0.090-0.120 W / (m·K), and the strength can reach 5.0-7.0 MPa.

[0009] The connecting piece is made of corrosion-resistant basalt fiber reinforced plastic (BFRP) with a diameter of 8 mm and a thermal conductivity of 0.69 (W / (m·K)).

[0010] The above-mentioned method for manufacturing the assembled sandwich wall panel for construction comprises the following steps:

[0011] 1. The core layer of the foamed geopolymer is made of slag and fly ash as the main gelling materials, which are reacted by alkali-activated solution and foamed by hydrogen peroxide to form a foamed geopolymer material;

[0012] 2. To prepare the EGC matrix, first weigh various raw materials according to the weight ratio; then mix the previously weighed alkali-activated solution and water evenly for later use; then put the weighed slag, quartz sand, and fly ash into a mixing barrel and stir for 2-4 minutes to evenly mix the various powdered materials; then slowly pour the alkali-activated solution and water into the mixing barrel and stir for 2-3 minutes until the mixture in the machine shows good fluidity; during the stirring process, evenly sprinkle PE chopped fibers, and continue stirring for 2-3 minutes after all the PE chopped fibers are sprinkled into the mixing barrel until the chopped fibers are free of agglomeration;

[0013] 3. Pour EGC into the mold to form inner and outer leaf walls;

[0014] 4. Cut the fiber mesh according to the design size, and then insert the connectors into the multiple holes reserved on the insulation board according to the set spacing;

[0015] 5. Place the prepared outer leaf wall on a vibration table for vibration. After the vibration is even, immediately lay one side of the insulation board with the connector flat on the inner leaf wall. No interface adhesive is required. Gently press the insulation board to make it tightly bonded to the outer leaf wall.

[0016] 6. Repeat step 5 to connect the inner leaf wall to the insulation board;

[0017] 7. Connect the inner and outer leaf walls, leaving a gap of 60mm, then slowly pour the foamed geopolymer in and wait for it to foam naturally and fill the space.

[0018] 8. After the cast wall panels are cured in a standard environment for 28 days, the molds are removed to complete the production of assembled sandwich wall panels for construction.

[0019] The material of the fiber woven mesh is selected from a carbon fiber woven mesh, a glass fiber woven mesh, a basalt fiber woven mesh, an aramid fiber woven mesh, or a mixed fiber woven mesh.

[0020] The materials of the EGC matrix include the following components in parts by mass: 338 parts of slag, 225 parts of fly ash, 192 parts of quartz sand, 6 parts of barium chloride, 90 parts of water, 20 parts of sodium hydroxide, 219 parts of sodium silicate, and 10 parts of PE fiber.

[0021] Beneficial effects: The present invention uses new wall material fiber woven mesh, EGC, foamed geopolymer and basalt fiber composite (BFRP for short) rib connectors, combined with high-quality thermal insulation materials, and organically combines them to form a sandwich structure. It overcomes the problems of the current prefabricated sandwich insulation wall panels, such as heavy weight, easy cracking, poor thermal insulation effect, poor durability, and inability to achieve lightweight. It has multiple functions in one, and has the advantages of light weight, crack resistance, earthquake resistance, fire resistance, thermal insulation and sound insulation, and good durability. It is suitable for most engineering environments and has broad application prospects. The main advantages compared with the existing technology are:

[0022] The EGC with strain hardening and multi-crack characteristics is compounded with a fiber woven mesh with high strength, good toughness and durability. The composite structure has excellent mechanical properties, durability and crack control capabilities. Using it as a wall panel material can reduce the cost of later wall maintenance.

[0023] The fiber woven mesh replaces the steel bar, and the thickness of the protective layer only needs to meet the requirements of bonding and anchoring. It has strong corrosion resistance and does not need to consider the rust problem caused by the placement of steel bars in traditional wall panels. The entire wall panel has no reinforcement, which greatly reduces the weight and cost of the sandwich insulation wall panel, and truly achieves energy saving, high efficiency and environmental protection.

[0024] The wall panels can be prefabricated in the factory and designed and produced according to the actual size requirements, and the engineering quality is guaranteed. The strength, stability and safety of the wall panels are guaranteed by the performance of the wall materials themselves and the connectors. There is no need to rely on light steel keels or lay steel mesh. When in use, they can be directly transported to the site for hoisting. The installation steps are simple, the construction speed is fast, the cycle is short, the cost is low, the construction energy consumption is low, and the construction waste is small. It is beneficial to environmental protection and has broad application prospects and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of the assembled sandwich wall panel in the present invention

[0026] 1-EGC inner and outer leaf walls, 2-insulation board, 3-foamed geopolymer core layer, 4-fiber woven mesh, 5-BFRP connector DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0028] 1. To prepare the EGC matrix, first weigh various raw materials according to the weight ratio; then mix the previously weighed alkali-activated solution and water evenly for later use; then put the weighed slag, quartz sand, and fly ash into a mixing barrel and stir for 24 minutes to evenly mix the various powdered materials; then slowly pour the alkali-activated solution and water into the mixing barrel and stir for 2 to 3 minutes until the mixture in the machine shows good fluidity; during the stirring process, evenly sprinkle PE chopped fibers, and continue stirring for 2 to 3 minutes after all the PE chopped fibers are sprinkled into the mixing barrel until the chopped fibers are free of agglomeration;

[0029] 2. Pour EGC into the mold to form inner and outer leaf walls;

[0030] 3. Cut the fiber mesh according to the designed size, and then insert the connectors into the multiple holes reserved on the insulation board according to the set spacing;

[0031] 4. Place the prepared outer leaf wall on a vibration table and vibrate it. After it vibrates evenly, immediately lay one side of the insulation board with the connector flat on the inner leaf wall. No interface adhesive is required. Gently press the insulation board to make it tightly bonded to the outer leaf wall.

[0032] 5. Repeat step 5 to connect the inner leaf wall to the insulation board;

[0033] 6. Connect the inner and outer leaf walls, leaving a gap of 60mm, then slowly pour the foamed geopolymer and wait for it to foam naturally and fill the space.

[0034] 7. After the cast wall panels are cured in a standard environment for 28 days, the molds are removed to complete the production of assembled sandwich wall panels for construction.

[0035] Therefore, the embodiments disclosed above are only illustrative in all aspects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A prefabricated floor structure for a building, characterized in that: The prefabricated wall panel includes an external non-load-bearing wall panel composed of inner and outer leaf walls of EGC material, an insulation board, and a foamed geopolymer inner core layer arranged in sequence. The inner and outer leaf walls of EGC material, the insulation board, and the foamed geopolymer inner core layer are connected together by a BFRP connector, and the total thickness of the wall panel connected into one is 180 mm.

2. The assembled floor structure for construction according to claim 1, characterized in that: The thickness of the inner and outer leaf walls of the EGC material is 20 mm.

3. The assembled floor structure for construction according to claim 1, characterized in that: The thermal insulation board is made of XPS thermal insulation board, and the thickness of the thermal insulation board is 40mm.

4. The assembled floor structure for construction according to claim 1, characterized in that: The thickness of the foamed geopolymer inner core layer is 60 mm, the dry density can be controlled at 550-900 kg / m3, the thermal conductivity can be controlled at 0.090-0.120 W / (m·K), and the strength can reach 5.0-7.0 MPa.

5. The assembled floor structure for construction according to claim 1, characterized in that: The connecting piece is made of corrosion-resistant basalt fiber reinforced plastic (BFRP) with a diameter of 8 mm and a thermal conductivity of 0.69 (W / (m·K)).

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