Composite material for laminated slab, preparation method and laminated slab

Abstract

The invention relates to a composite material for a laminated slab, a preparation method and the laminated slab. The composite material comprises the following components in percentage by weight: 20%-35% of cement, 5%-15% of a mineral admixture, 50%-65% of sand, 0.05%-0.20% of a defoaming agent, 0.10%-0.25% of a polycarboxylate superplasticizer, 1.0%-3.0% of a composite expanding agent and 0.05%-0.20% of an early strength agent, and the fiber with the total volume mixing amount of 0.20%-0.70% is further included. According to the composite material disclosed by the invention, the slump of the material is remarkably improved by controlling the components and the content of a gelling system of the whole material, and self-leveling of a mixture is realized in a pouring process; by adding a high-performance chemical admixture and co-doping fibers, the overall bearing capacity of the bottom plate material is remarkably improved, the thickness of the plate is further reduced, and the working performance and mechanical performance of the laminated plate are improved. According to the laminated slab, the bottom plate with high breaking strength and compressive strength is selected, so that the thickness of the bottom plate is small, the purpose that the two-way slab is stressed during dense splicing of slab joints is achieved, and increase of the dead weight is avoided; and by arranging the fiber gridding cloth, the laminated plate has higher strength and flexibility, and cracking is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of floor slabs, and in particular to a composite material for a composite slab, a preparation method and the composite slab. Background Art

[0002] In the traditional construction process, floor construction occupies a lot of manpower, material resources and time resources, thus restricting the construction progress of the entire project. With the development of prefabricated composite slabs, the use of formwork has been reduced in the floor construction process, effectively improving construction efficiency. At present, the research on reinforced truss composite slabs has been relatively mature and widely used. However, during the construction phase of traditional reinforced truss composite slabs, the embedded steel bars in the prefabricated slabs need to extend out of the slabs, resulting in reduced production efficiency; during transportation, the prefabricated bottom slab components made of concrete have a large deadweight and are prone to cracks, which increases the requirements for transportation; during the construction phase, the protruding steel bars are prone to collision; at the same time, due to the large thickness of the prefabricated bottom slab, the subsequent steel bar binding and pipeline laying increase the construction difficulty and reduce the construction efficiency; and the construction process at the joints is complicated and cumbersome, and the quality cannot be guaranteed.

[0003] In the related technology, reinforced truss concrete composite slab can combine the advantages of cast-in-place slab and prefabricated slab, and has the advantages of fast construction speed, short construction period, light weight of prefabricated components, good integrity, and saving formwork. However, since the thickness of the prefabricated slab should not be less than 60mm, the space under the truss is small when the slab thickness is thin, and it is difficult to meet the needs of pre-buried water and electricity pipelines. In order to meet the needs of pre-buried pipelines, it is necessary to increase the slab thickness, thereby increasing the self-weight of the building and increasing the cost per square meter. Secondly, beard ribs need to be set around the reinforced truss concrete composite slab, which increases the construction difficulty during construction and installation, low construction efficiency, and greatly increases costs. In addition, since the truss reinforced concrete composite slab is prone to cracks, the floor length is short, which increases the production and hoisting costs.

[0004] There is still relatively little research on composite slab materials. Generally, C50 and C60 ordinary concrete are used to cast the composite slab bottom plate materials, which leads to low efficiency in the composite slab casting process and requires a lot of manual assistance. In addition, the material has too much dead weight, low mechanical properties and insufficient load-bearing capacity.

[0005] Therefore, it is necessary to improve one or more problems existing in the above-mentioned related technical solutions.

[0006] It should be noted that this section is intended to provide background or context for the technical solutions of the present invention stated in the claims. The description herein is not admitted to be prior art by inclusion in this section. Summary of the invention

[0007] The object of the present invention is to provide a composite material for a laminated board, a preparation method and a laminated board, thereby solving one or more problems caused by the limitations and defects of the related art at least to a certain extent.

[0008] The present invention first provides a composite material for a laminated plate, the composite material comprising the following components in percentage by weight:

[0009] Cement 20%~35%, mineral admixture 5%~15%, sand 50%~65%, defoamer 0.05%~0.20%, polycarboxylic acid water reducer 0.10%~0.25%, composite expansion agent 1.0%~3.0%, early strength agent 0.05%~0.20%;

[0010] The composite material also includes fibers with a total volume content of 0.20% to 0.70%.

[0011] In the present invention, the mineral admixture comprises: mineral powder and fly ash; the composite expansion agent is compounded by ettringite·lime system materials.

[0012] The composite material of the present invention significantly improves the slump of the material by controlling the components and content of the entire material cementitious system, realizes self-leveling of the mixture during the pouring process, and reduces manpower consumption; and significantly improves the overall bearing capacity of the base plate material by adding high-performance chemical admixtures and fiber composite blending, further reduces the plate thickness, and improves the working performance and mechanical properties of the composite plate.

[0013] In the present invention, the early strength agent includes lithium sulfate, calcium formate and triethanolamine, which are used alone or in combination.

[0014] In the present invention, the fiber comprises at least one of steel fiber, polypropylene fiber and polyethylene fiber.

[0015] The present invention further provides a method for preparing a composite material for a laminated plate, which is used to prepare the composite material for a laminated plate as described in any one of the above items, and the preparation method comprises:

[0016] The cement, mineral admixture, sand, defoamer, polycarboxylate water reducer, composite expansion agent and early strength agent are mixed evenly, and after adding water, stirred until uniform;

[0017] Add the fiber and continue mixing until smooth.

[0018] The present invention also provides a composite board, comprising:

[0019] A plurality of steel bar trusses, each of which comprises: an upper chord steel bar, two lower chord steel bars and two web bars; the two web bars are at least partially wavy and are respectively arranged on both sides of the upper chord steel bar, the web bars comprise a wavy portion at the upper end and a bent portion at the lower end, the wavy portions and the bent portions are both multiple and alternately arranged; the upper chord steel bar is fixedly arranged between the top ends of the two web bars, and the lower chord steel bar is arranged on the wavy portion close to the bent portion;

[0020] A bottom plate, a plurality of the steel bar trusses are arranged in parallel on the bottom plate, and the bending portion is arranged in the bottom plate by pre-embedding, post-casting or pressing; the thickness of the bottom plate is 4 mm to 30 mm, and the 28-day flexural strength of the bottom plate is not less than 12 MPa, and the 28-day compressive strength is not less than 75 MPa;

[0021] A steel mesh, the steel mesh is arranged on the bottom plate, the steel mesh includes a plurality of transverse steel bars and a plurality of longitudinal steel bars arranged vertically and horizontally, the transverse steel bars are fixedly connected to the lower chord steel bars, and the transverse steel bars are arranged through the wave portion;

[0022] A fiber mesh cloth, the fiber mesh cloth is arranged inside the bottom plate and below the bending portion;

[0023] Wherein, the bottom plate is made of any of the composite materials for composite panels described above.

[0024] In the present invention, the longitudinal steel bars are arranged below the transverse steel bars, and the longitudinal steel bars and the lower chord steel bars are arranged on the same plane.

[0025] In the present invention, connecting steel bars are transversely inserted into the plurality of steel bar trusses, and the connecting steel bars are used to connect the plurality of steel bar trusses into one.

[0026] In the present invention, connecting steel bars are transversely inserted into the plurality of steel bar trusses, and the connecting steel bars are used to connect the plurality of steel bar trusses into one.

[0027] In the present invention, the fiber mesh cloth and the lower surface of the bottom plate have a spacing of 2 to 5 mm; the bottom plate has a width of 600 mm to 4000 mm and a length of 1000 mm to 18000 mm.

[0028] In the present invention, the fiber mesh cloth is any one of glass fiber mesh cloth, basalt fiber mesh cloth and carbon fiber mesh cloth.

[0029] The technical solution provided by the present invention may include the following beneficial effects:

[0030] The 28-day flexural strength of the base plate prepared using the composite material of this embodiment is not less than 12 MPa, and the 28-day compressive strength is not less than 75 MPa.

[0031] The composite board of the present invention selects a base plate with high flexural strength and compressive strength so that the thickness of the base plate is small and the thickness of the base plate will not be increased. When used for splicing, not only the position of the splicing seam is easy to handle and the bending moment can be transmitted, thereby achieving the purpose of bidirectional plate force when the seams are closely spliced, but also avoiding the increase of dead weight and the increase of construction cost; by arranging a fiber mesh cloth, the composite board has higher strength and flexibility, avoiding cracking caused by surface tension contraction and external force; the composite board of the present application improves the production, transportation and hoisting efficiency while improving the quality of house delivery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings herein are incorporated into the specification and constitute a part of the specification, represent embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 A schematic diagram showing a three-dimensional structure of a laminated plate in an exemplary embodiment of the present invention is shown;

[0034] Figure 2 A schematic structural diagram showing a steel bar truss in an exemplary embodiment of the present invention;

[0035] Figure 3 A schematic diagram showing a top view of a laminated plate in an exemplary embodiment of the present invention is shown;

[0036] Figure 4 Show Figure 3 1-1 schematic diagram of the cross-sectional structure;

[0037] Figure 5 A schematic structural diagram of a fiber mesh cloth in an exemplary embodiment of the present invention is shown.

[0038] Reference numerals:

[0039] 100, steel truss; 101, upper chord steel bar; 102, lower chord steel bar; 103, web reinforcement; 1031, wave part; 1032, bending part; 200, bottom plate; 300, steel mesh; 301, transverse steel bar; 302, longitudinal steel bar; 400, fiber mesh cloth. DETAILED DESCRIPTION

[0040] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present invention will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0041] In addition, the accompanying drawings are only schematic illustrations of embodiments of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0042] In this exemplary embodiment, a composite material for a laminated plate is provided, the composite material comprising the following components in weight percentage:

[0043] Cement 20%~35%, mineral admixture 5%~15%, sand 50%~65%, defoamer 0.05%~0.20%, polycarboxylic acid water reducer 0.10%~0.25%, composite expansion agent 1.0%~3.0%, early strength agent 0.05%~0.20%;

[0044] The composite material also includes fibers with a total volume content of 0.20% to 0.70%.

[0045] In this embodiment, the use of mineral admixtures can enhance the hydration of gel systems such as cement, improve the strength, density and impermeability of the composite board, and improve the segregation and water seepage performance of the material; the added defoamer can eliminate bubbles generated during the mixing of the materials, improve the pore structure of the hardened body of the composite board material, and at the same time improve the slurry performance; the polycarboxylic acid water reducer can disperse cement and other gelling materials and improve the fluidity of the mixed materials; the composite expansion agent provides early and late expansion for the composite board to prevent or reduce cracks caused by material shrinkage; the added fiber has high strength, high elastic modulus and high flexibility, and is used to enhance the overall flexibility of the composite board material and avoid cracking caused by surface tension shrinkage and external force of the material; the 28-day flexural strength of the base plate prepared using the composite material of this embodiment is not less than 12MPa, and the 28-day compressive strength is not less than 75MPa.

[0046] In addition, the percentage content of cement can be 25%, 30%, etc.; the percentage content of mineral admixture can be 8%, 10%, etc.; the percentage content of sand can be 55%, 60%, etc.; the percentage content of defoaming agent can be 0.10%, 0.15%, etc.; the percentage content of polycarboxylic acid water reducer can be 0.15%, 0.20%, etc.; the percentage content of composite expansion agent can be 1.5%, 2.0%, etc.; the percentage content of early strength agent can be 0.10%, 0.15%, etc.; the total volume content of the fiber can be 0.4%, 0.50%, etc.

[0047] On the basis of the above embodiments, the cement can be 42.5 grade silicate cement; the mineral admixture can be S95 mineral powder and secondary fly ash (loss on ignition ≤ 8.0%); the sand can be quartz sand or machine-made sand, with a particle size of 1.18 mm, 1.18 mm to 2.36 mm and 2.36 mm to 4.75 mm, and the maximum particle size of the sand is less than 4.75 mm, and the volume density is 2.5 g / cm 3 ~3.9g / cm 3 , the water absorption rate does not exceed 4%; the defoaming agent adopts silicone defoaming agent, which can more effectively eliminate the bubbles generated during the stirring process, improve the pore structure of the hardened body of the composite board material, and at the same time improve the slurry performance; the water reduction rate of the polycarboxylic acid high-performance water reducer is not less than 35%; the composite expansion agent is compounded with calcium aluminate·lime system materials; the early strength agent includes lithium sulfate, calcium formate and triethanolamine, which are used alone or in combination.

[0048] In addition, the fibers are mixed with steel fibers, polypropylene fibers, polyethylene fibers and other fibers. The steel fibers are processed into end hook type steel fibers, and the diameter of the polypropylene fibers must be more than 0.3 mm.

[0049] The present invention also provides a method for preparing a composite material for a laminated plate, comprising:

[0050] The cement, mineral admixture, sand, defoamer, polycarboxylic acid water-reducing agent, composite expansion agent and early strength agent are mixed uniformly according to the proportion, and after adding water, stirred until uniform; then, fibers are added according to the proportion and stirred continuously until uniform.

[0051] The amount of water added is generally 10% to 14% of the weight of the solid material, the stirring time is 4 to 6 minutes, and the stirring speed of the stirring equipment is 40 to 60 rpm. After adding water and stirring evenly, after the slurry is stirred evenly, add the fiber and stir for another 3 to 5 minutes to obtain the composite material.

[0052] The present invention also provides a composite board, referring to Figure 1 to Figure 5 As shown, the composite plate includes: a plurality of steel bar trusses 100 , a bottom plate 200 , a steel bar mesh 300 and a fiber mesh cloth 400 .

[0053] Specifically, please refer to Figure 2 Each of the steel trusses 100 includes an upper chord steel bar 101 , two lower chord steel bars 102 and two web bars 103 .

[0054] The two web reinforcements 103 are at least partially wavy and are respectively arranged on both sides of the upper chord steel bar 101. The web reinforcement 103 includes a wavy portion 1031 at the upper end and a bent portion 1032 at the lower end. The wavy portion 1031 and the bent portion 1032 are both multiple and alternately arranged. The wavy portion 1031 and the bent portion 1032 can be obtained by bending the same steel bar.

[0055] The upper chord steel bar 101 is fixedly arranged between the top ends of the two web bars 103, and the lower chord steel bar 102 is arranged on the wave portion 1031 close to the bending portion 1032. In addition, a reinforcing rib parallel to the lower chord steel bar 102 may be arranged in the middle of the wave portion 1031 of the web bar 103 to further improve the strength of the steel truss 100.

[0056] Please refer to Figure 1 and Figure 4 The plurality of steel bar trusses 100 are arranged in parallel on the bottom plate 200, and the bending portion 1032 is arranged in the bottom plate 200 by pre-embedding, post-casting or pressing. The thickness of the bottom plate 200 is 4 mm to 30 mm, and the 28-day flexural strength of the bottom plate 200 is not less than 12 MPa, and the 28-day compressive strength is not less than 75 MPa.

[0057] Please refer to Figure 4 The steel mesh 300 is arranged on the bottom plate 200, and the steel mesh 300 includes a plurality of transverse steel bars 301 and a plurality of longitudinal steel bars 302 arranged vertically and horizontally. The transverse steel bars 301 are fixedly connected to the lower chord steel bars 102, and the transverse steel bars 301 are arranged through the wave portion 1031. The steel mesh 300 is connected to the steel truss 100, and the overall strength is higher.

[0058] The fiber mesh cloth 400 is disposed inside the bottom plate 200 and below the bending portion 1032 .

[0059] The bottom plate 200 is made of the composite material for laminated plates described in any one of the above embodiments.

[0060] In the present embodiment, by selecting a base plate 200 with high flexural strength and compressive strength, the thickness of the base plate 200 is small, and the thickness of the base plate 200 will not be increased. When used for splicing, not only the position of the splicing seam is easy to handle, but also the bending moment can be transmitted, thereby achieving the purpose of bidirectional plate force when the seams are closely spliced, and avoiding the increase of deadweight and the increase of construction cost; by setting the fiber mesh cloth 400, the composite board has higher strength and flexibility, avoiding cracking caused by surface tension shrinkage and external force; the composite board of the present application improves the production, transportation, and hoisting efficiency while improving the quality of house delivery.

[0061] Based on the above embodiment, optionally, the longitudinal reinforcement 302 is arranged below the transverse reinforcement 301, and the longitudinal reinforcement 302 and the lower chord reinforcement 102 are arranged on the same plane. When manufacturing a composite board, the fiber mesh cloth 400 can be laid first, and then the high-performance composite base plate 200 can be cast, and then the steel mesh 300 and the steel truss 100 are welded to form a truss mesh, which is laid on the base plate 200 to finally form the composite board of the present application.

[0062] Optionally, in some embodiments, a plurality of the steel trusses 100 are transversely penetrated with connecting steel bars (not shown in the figure), and the connecting steel bars can be welded to the lower chord steel bars 102, and the connecting steel bars are used to connect the plurality of the steel trusses 100 into one. Usually, a plurality of steel trusses 100, such as 4 or 5, are arranged on a base plate 200, and the plurality of steel trusses 100 are welded together with connecting steel bars to form a whole, so that the plurality of steel trusses 100 can be moved at a time and installed on the base plate 200 as a whole, which saves installation time and is conducive to the arrangement of the plurality of steel trusses 100, so that the bearing capacity of each part of the base plate 200 is consistent.

[0063] Optionally, in some embodiments, please refer to Figure 4 and Figure 5 The fiber mesh cloth 400 and the lower surface of the bottom plate 200 have a spacing of 2 to 5 mm, for example, 3 mm, 4 mm, etc., but not limited thereto. When making a laminated board, the fiber mesh cloth 400 is laid first, and then the high-performance composite bottom plate 200 is cast.

[0064] Optionally, in some embodiments, the fiber mesh cloth 400 is any one of a glass fiber mesh cloth 400, a basalt fiber mesh cloth 400 and a carbon fiber mesh cloth 400. The fiber mesh cloth 400 can be an alkali-resistant mesh cloth with a mesh center distance of (5-30) mm×(5-30) mm and a line density of 2000tex-5000tex. Among them, the glass fiber mesh cloth 400 can be a customized yellow glass fiber mesh cloth, which is made of an alkali-free glass fiber mesh cloth 400 as a base material and then coated with a modified acrylic copolymer glue liquid. It has high strength, high elastic modulus, and high flexibility, and is used to enhance the overall flexibility of the laminate material and avoid cracking caused by surface tension shrinkage and external force of the material.

[0065] The connection between the steel truss 100 structures and between the steel mesh 300 and the steel truss 100 of the present application can be made by welding, replacing conventional binding technology, saving manpower, and improving production efficiency and structural strength.

[0066] In the present invention, optionally, the thickness of the bottom plate 200 is 4 mm to 30 mm, such as 10 mm, 20 mm, etc.; the width is 600 mm to 4000 mm, such as 800 mm, 1500 mm, 2000 mm, etc.; the length is 1000 mm to 18000 mm, such as 2000 mm, 4000 mm, 8000 mm, 10000 mm, etc. The above size setting parameters of the bottom plate 200 can meet the building's requirements for the strength of the composite plate while reducing the thickness of the bottom plate 200.

[0067] In the present invention, optionally, the diameters of the upper chord steel bars 101 and the lower chord steel bars 102 of the steel truss 100 are 6-20 mm, the diameter of the web bars 103 is 4-7 mm, the height of the steel truss 100 is 70-270 mm, and the width of the steel truss 100 is 70-90 mm.

[0068] In the present invention, the angle between the bending portion 1032 and the horizontal plane is optionally 0-45°, for example, 10°, 20°, etc. The bending portion 1032 is used to connect the steel truss 100 and the bottom plate 200, so that the connection strength between the two is higher, and the engineering quality can be guaranteed.

[0069] In the present invention, optionally, the two ends of the lower chord steel bars 102 of the steel bar truss 100 do not extend out of the bottom plate 200, for example, the two ends of the lower chord steel bars 102 are flush with the edge of the bottom plate 200. The strength of the composite slab of the present application has met the construction requirements, and the bottom plate 200 is thin and easy to handle when splicing, and there is no need to add reinforcement around, which makes the construction more convenient.

[0070] In a test example, the performance test results of the base plate 200 of the present application are shown in Table 1.

[0071] Table 1 Bottom plate parameter test results

[0072]

[0073] In summary, this application has the following beneficial effects:

[0074] 1. Traditional reinforced truss composite slabs mostly use ordinary concrete to cast the bottom plate material. Due to the high content of coarse aggregate in concrete and the small slump of the material, a lot of manual assistance is required during the casting process. This application removes the coarse aggregate and controls the maximum particle size of the fine aggregate sand to not exceed 4.75mm, further optimizing the material mix ratio, reducing the deadweight of the composite slab, and facilitating convenient transportation. The composite material for composite slabs developed by the present invention significantly improves the slump of the material by controlling the aggregate particle size and adjusting the components and content of the material cementitious system, achieving self-leveling of the mixture during the casting process and reducing manpower consumption; by adding high-performance chemical admixtures and fiber compounding, the overall bearing capacity of the bottom plate material is significantly improved, the plate thickness is further reduced, and the working performance and mechanical properties of the composite slab are improved.

[0075] 2. Traditional reinforced truss composite plate materials have weak load-bearing capacity and low toughness. This application significantly improves the overall loading level of the composite plate materials by compounding different types of preferred chemical fibers, steel fibers, and yellow glass fiber mesh cloth, and enhances the toughness of the composite plate bottom plate materials to reduce the occurrence of cracks.

[0076] 3. Use high-performance composite materials as the prefabricated base plate 200. Utilize the high strength, high durability, high ductility and crack control ability of the high-performance composite materials to reduce the thickness of the prefabricated base plate 200, reduce the amount of raw materials per unit area, and make the prefabricated components light in weight, which is convenient for production, transportation and installation, and reduces the cost of construction measures.

[0077] 4. In the present invention, since the thickness of the prefabricated bottom plate 200 is relatively thin, the space for passing professional pipelines under the steel truss 100 is increased, which is convenient for on-site construction.

[0078] 5. In the present invention, since the thickness of the bottom plate 200 is relatively thin, there is no need to extend ribs around it. By overlapping the steel bars, the stress state of the two-way plate can be formed under the condition of close joints of the plates. In addition, there is no post-casting area at the joint position, and a leveling beam can be set for leveling, which ensures the construction quality while simplifying the construction process.

[0079] 6. Due to the excellent mechanical properties of the high-performance composite material, the present invention can increase the span of the prefabricated base plate 200 with a relatively thin plate thickness, realize a large-span prefabricated base plate 200, reduce the joints in the room, improve the quality of project delivery, and reduce the number of demolding, hoisting and installation, making construction convenient.

[0080] 7. The present invention utilizes the excellent tensile strength and crack control ability of high-performance composite materials, and can avoid the cracking problem of the prefabricated base plate 200 during the production, transportation and installation construction process by simply changing the material of the base plate 200, without applying prestress.

[0081] 8. The present invention uses high-performance composite materials as the prefabricated base plate 200. On the one hand, due to the excellent durability of the high-performance composite materials, on the other hand, no prestressing process is used and there is no stress relaxation, so it has good durability.

[0082] 9. The base plate 200 of the present invention is relatively thin, and the thickness of the composite plate formed by post-casting is smaller than that of the traditional solution, thereby increasing the clear height of the house.

[0083] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like that may appear in the above description indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention.

[0084] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0085] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0088] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.

Claims

1. A composite material for laminated panels, characterized in that: The composite material comprises the following components in weight percentage: Cement 20%~35%, mineral admixture 5%~15%, sand 50%~65%, defoamer 0.05%~0.20%, polycarboxylic acid water reducer 0.10%~0.25%, composite expansion agent 1.0%~3.0%, early strength agent 0.05%~0.20%; The composite material also includes fibers with a total volume content of 0.20% to 0.70%.

2. The composite material for laminated panels according to claim 1, characterized in that: The mineral admixture comprises: mineral powder and fly ash; the composite expansion agent is compounded with ettringite·lime system materials.

3. The composite material for laminated panels according to claim 1, characterized in that: The early strength agent includes lithium sulfate, calcium formate and triethanolamine, which are used alone or in combination.

4. The composite material for laminated panels according to claim 1, characterized in that: The fibers include at least one of steel fibers, polypropylene fibers and polyethylene fibers.

5. A method for preparing a composite material for a laminated plate, characterized in that: Used to prepare the composite material for laminated panels according to any one of claims 1 to 4, the preparation method comprising: The cement, mineral admixture, sand, defoamer, polycarboxylate water reducer, composite expansion agent and early strength agent are mixed evenly, and after adding water, stirred until uniform; Add the fiber and continue mixing until smooth.

6. A composite board, characterized in that: include: A plurality of steel bar trusses, each of which comprises: an upper chord steel bar, two lower chord steel bars and two web bars; the two web bars are at least partially wavy and are respectively arranged on both sides of the upper chord steel bar, the web bars comprise a wavy portion at the upper end and a bent portion at the lower end, the wavy portions and the bent portions are both multiple and alternately arranged; the upper chord steel bar is fixedly arranged between the top ends of the two web bars, and the lower chord steel bar is arranged on the wavy portion close to the bent portion; A bottom plate, a plurality of the steel bar trusses are arranged in parallel on the bottom plate, and the bending portion is arranged in the bottom plate by pre-embedding, post-casting or pressing; the thickness of the bottom plate is 4 mm to 30 mm, and the 28-day flexural strength of the bottom plate is not less than 12 MPa, and the 28-day compressive strength is not less than 75 MPa; A steel mesh, the steel mesh is arranged on the bottom plate, the steel mesh includes a plurality of transverse steel bars and a plurality of longitudinal steel bars arranged vertically and horizontally, the transverse steel bars are fixedly connected to the lower chord steel bars, and the transverse steel bars are arranged through the wave portion; A fiber mesh cloth, the fiber mesh cloth is arranged inside the bottom plate and below the bending portion; Wherein, the base plate is made of the composite material for composite panels according to any one of claims 1 to 4.

7. The laminated plate according to claim 6, characterized in that: The longitudinal steel bars are arranged below the transverse steel bars, and the longitudinal steel bars and the lower chord steel bars are arranged on the same plane.

8. The laminated plate according to claim 6, characterized in that: Connecting steel bars are transversely inserted into the plurality of the steel bar trusses, and the connecting steel bars are used to connect the plurality of the steel bar trusses into one.

9. The laminated plate according to claim 6, characterized in that: The fiber mesh cloth and the lower surface of the bottom plate have a spacing of 2 to 5 mm; the bottom plate has a width of 600 mm to 4000 mm and a length of 1000 mm to 18000 mm.

10. The composite plate according to claim 6, characterized in that: The fiber mesh cloth is any one of glass fiber mesh cloth, basalt fiber mesh cloth and carbon fiber mesh cloth.

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