An aerated concrete floor slab based on UHPC and its construction method

Abstract

The present invention discloses a UHPC-based aerated concrete floor slab and its construction method. The construction method comprises: using an insulation material as a formwork, inverting and tying truss steel bars in the formwork, so that the upper ends of the truss steel bars extend into the formwork and the lower ends are exposed outside the formwork; pouring a fiber-modified autoclaved aerated concrete material on the side of the formwork with the truss steel bars, aerating and cutting the material to form an aerated concrete blank with the truss steel bars; heating and pressurizing the aerated concrete blank to increase the strength of the aerated concrete blank and melt the formwork to expose the upper ends of the truss steel bars; connecting the truss steel bars to the UHPC bottom liner using a snap connector; and post-pouring ordinary concrete on the fiber-modified autoclaved aerated concrete layer with the UHPC bottom liner to form the aerated concrete floor slab. The present invention uses a material with a low melting point as the formwork, which can effectively solve the problem that the truss steel bars placed in the autoclaved aerated concrete layer affect the cutting of the aerated concrete material.

Description

Technical Field

[0001] The present invention belongs to the field of building technology, and in particular relates to an aerated concrete floor slab based on UHPC and a construction method thereof. Background Art

[0002] In July 2020, the Ministry of Housing and Urban-Rural Development and 13 other ministries jointly issued the "Guiding Opinions on Promoting the Coordinated Development of Intelligent Construction and Building Industrialization." This document calls for the vigorous development of prefabricated buildings and the establishment of a specialized, large-scale, and information-based production system based on standardized components. Prefabricated buildings undeniably offer significant advantages in energy conservation, environmental protection, and efficiency.

[0003] As an important component of prefabricated structures, concrete composite slabs can greatly improve the overall building prefabrication rate and are widely used in various prefabricated concrete structure systems. However, in actual projects, traditional concrete composite slabs have a large deadweight. As we all know, excessive deadweight of the structure is not conducive to the seismic performance of the structure. In addition, the high transportation and lifting costs caused by the heavy weight of the components themselves have to some extent restricted the promotion of prefabricated buildings. In terms of building material application, traditional concrete composite slabs are still mainly ordinary concrete, and the application of green building materials is insufficient. In terms of performance, traditional concrete composite slabs have poor thermal insulation and sound insulation performance.

[0004] To address these issues, early studies have proposed using autoclaved aerated concrete slabs equipped with straight round steel bars as precast base plates for composite floor slabs, with concrete subsequently poured to form the composite slabs. However, the following issues remain: First, the overall performance of the autoclaved aerated concrete base plate equipped with straight round steel bars and the subsequently poured concrete can only be achieved through the interfacial bonding between the autoclaved aerated concrete and the subsequently poured concrete. If truss steel bars are incorporated into the autoclaved aerated concrete slab, with the truss steel bars exposed within the autoclaved aerated concrete base plate improving the overall performance between the base plate and the subsequently poured concrete, the presence of the truss steel bars prevents cutting at the top surface of the autoclaved aerated concrete base plate due to limitations in the aerated concrete production process. Secondly, as a porous material with a porosity of up to 10180%, autoclaved aerated concrete has a high water absorption rate and poor carbonization properties. If autoclaved aerated concrete panels are used alone as prefabricated base plates for composite floor slabs, the performance of the autoclaved aerated concrete materials will gradually deteriorate due to moisture absorption, carbonization and other factors in the environment, and the internal steel bars may be corroded. In addition, the compressive and flexural strengths of autoclaved aerated concrete materials are very low. If heavy objects such as chandeliers are placed on the base plate, the autoclaved aerated concrete base plate cannot provide sufficient pull-out resistance. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, the present invention provides an aerated concrete floor slab based on UHPC, addressing the issues of heavy weight, insufficient application of green building materials, and poor thermal and sound insulation performance in existing composite floor slab components. Furthermore, the present invention provides a method for producing an autoclaved aerated concrete base slab equipped with truss reinforcement, addressing the production process impediment to cutting when using autoclaved aerated concrete slabs as prefabricated base slabs for composite floor slabs equipped with truss reinforcement. The technical problems to be solved by the present invention are achieved through the following technical solutions:

[0006] The present invention provides a construction method of an aerated concrete floor slab based on UHPC, comprising:

[0007] S1: Using a thermal insulation material of a certain thickness as a template, the truss steel bars are tied upside down and fixed in the template so that the upper ends of the truss steel bars extend into the template and the lower ends of the truss steel bars are exposed outside the template;

[0008] S2: pouring fiber-modified autoclaved aerated concrete material on the side of the template with the truss steel bars, aerating and cutting the material to form an aerated concrete body with the truss steel bars;

[0009] S3: heating and pressurizing the aerated concrete body so that the aerated concrete body generates strength and the formwork melts to expose the upper ends of the truss steel bars, thereby forming a fiber-modified autoclaved aerated concrete board with truss steel bars;

[0010] S4: Connecting the truss steel bars in the fiber-modified autoclaved aerated concrete panel to the UHPC bottom liner using a snap connector to form a fiber-modified autoclaved aerated concrete layer with the UHPC bottom liner;

[0011] S5: pouring ordinary concrete on the fiber-modified autoclaved aerated concrete layer with the UHPC bottom liner to form the aerated concrete floor slab.

[0012] In one embodiment of the present invention, the template is a polystyrene board, a polyurethane board or an extruded board.

[0013] In one embodiment of the present invention, the S2 includes:

[0014] Casting a fiber-modified autoclaved aerated concrete material on the side of the template with the truss steel bars and performing gas generation, with the gas generation direction being from the template side to the truss steel bars side, to form an autoclaved aerated concrete body with the truss steel bars;

[0015] The cutting is performed at the bottom of the autoclaved aerated concrete body away from the template, and only the autoclaved aerated concrete body at a certain distance from the bottom of the truss steel bar is cut.

[0016] In one embodiment of the present invention, the fiber-modified autoclaved aerated concrete is prepared by adding basalt fiber to autoclaved aerated concrete material, with the addition amount of basalt fiber being 0.3% per cubic meter of dry material.

[0017] In one embodiment of the present invention, the S3 includes:

[0018] The aerated concrete body is placed in an autoclave, and the autoclaved aerated concrete material is autoclaved at a temperature of 115-1200°C and a pressure of 1.3-11.5 MPa to generate strength, and the formwork is melted to expose the upper end of the truss steel bar, thereby forming a fiber-modified autoclaved aerated concrete board with truss steel bars.

[0019] In one embodiment of the present invention, the S4 includes:

[0020] S41: Inverting the fiber-modified autoclaved aerated concrete slab and drilling a plurality of through holes at the bottom truss steel bar positions;

[0021] S42: Casting the lower end of the snap connector on the upper surface of the UHPC bottom liner according to the position of the through hole to form a UHPC bottom liner with a snap connector;

[0022] S43: inserting the upper end of the snap connector on the UHPC bottom liner into the corresponding through hole on the fiber-modified autoclaved aerated concrete slab, and engaging the upper end of the snap connector with the truss steel bar, and making the lower surface of the autoclaved aerated concrete layer fit with the upper surface of the UHPC bottom liner;

[0023] S44: Extending an electric welder from the upper side of the through hole in the fiber-modified autoclaved aerated concrete slab to spot weld the connection points between the snap connector and the truss steel bar to form a fiber-modified autoclaved aerated concrete layer with a UHPC bottom liner.

[0024] In one embodiment of the present invention, the thickness of the UHPC bottom liner is 8112 mm.

[0025] In one embodiment of the present invention, the side length of the through hole is 315 cm.

[0026] Another aspect of the present invention provides an aerated concrete floor slab based on UHPC, which is prepared using the construction method described in any one of the above embodiments of the claims, wherein the aerated concrete floor slab comprises an autoclaved aerated concrete layer, truss steel bars, snap connectors, a UHPC bottom liner and a concrete layer, wherein:

[0027] The lower end of the truss steel bar is embedded in the autoclaved aerated concrete layer. A through hole is opened on the autoclaved aerated concrete layer. One end of the snap connector is connected to the lower end of the truss steel bar through the through hole. The other end of the snap connector is connected to the upper surface of the UHPC bottom liner, so that the lower surface of the autoclaved aerated concrete layer is in contact with the upper surface of the UHPC bottom liner.

[0028] A concrete layer is poured on the upper surface of the autoclaved aerated concrete layer and inside the through hole, so that the upper end of the truss steel bar is embedded in the inside of the concrete layer.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention proposes the use of autoclaved aerated concrete with truss steel bars as a prefabricated base plate and provides a method for manufacturing the autoclaved aerated concrete base plate with truss steel bars. It also proposes the use of a certain thickness of UHPC as a lining material at the bottom of the autoclaved aerated concrete slab to enhance the base plate's crack resistance and tensile strength, and to provide sufficient pull-out resistance for the installation of heavy objects such as chandeliers. Furthermore, the present invention uses a material with a low melting point, such as polystyrene board, as a formwork, which can effectively solve the problem of truss steel bars placed in the autoclaved aerated concrete layer affecting the cutting of the aerated concrete material.

[0031] 2. The present invention adopts fiber-modified autoclaved aerated concrete material as the middle layer of lightweight composite floor slabs, which greatly improves the application rate of green building materials in prefabricated buildings, greatly reduces the dead weight of the composite floor slabs, greatly reduces the seismic effect of the prefabricated structure under earthquake action, and greatly improves the thermal insulation and sound insulation performance of the composite floor slabs.

[0032] 3. The present invention uses snap-fit connectors to connect the truss reinforcement and the UHPC liner, effectively ensuring the connection between the base plate and the truss reinforcement. The truss reinforcement passes through the fiber-modified autoclaved aerated concrete middle layer, effectively ensuring the connection between the autoclaved aerated concrete middle layer and the UHPC liner.

[0033] 4. The present invention adopts UHPC as the composite floor lining, which greatly improves the crack resistance of the composite floor. At the same time, it can provide sufficient pull-out resistance for hooks, chandeliers, etc., effectively preventing water in the air from penetrating into the middle layer of the autoclaved aerated concrete material, causing the performance of the autoclaved aerated concrete material to deteriorate and the steel bars to rust, ensuring that the autoclaved aerated concrete board can exert its performance and improving the durability of the component.

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1This is a flow chart of a construction method of a UHPC-based aerated concrete floor slab provided by an embodiment of the present invention;

[0036] Figure 2 It is an existing aerated concrete slab configured with truss reinforcement;

[0037] Figure 3 Schematic diagram of a low melting point material template provided by an embodiment of the present invention;

[0038] Figure 4 Schematic diagram of an embodiment of the present invention providing a method of fixing a truss reinforcement to a low-melting-point template by inverted binding;

[0039] Figure 5 This is a schematic diagram of a process for pouring and cutting a fiber-modified autoclaved aerated concrete material provided by an embodiment of the present invention;

[0040] Figure 6 1 is a schematic cross-sectional view of a fiber-modified autoclaved aerated concrete panel with truss reinforcement provided by an embodiment of the present invention;

[0041] Figure 7 This is a structural perspective diagram of a fiber-modified autoclaved aerated concrete panel with truss steel bars provided by an embodiment of the present invention;

[0042] Figure 8 Schematic diagram of through-hole positions of a fiber-modified autoclaved aerated concrete slab with truss reinforcement provided by an embodiment of the present invention;

[0043] Figure 9 1 is a schematic structural diagram of a snap connector provided by an embodiment of the present invention;

[0044] Figure 10 This is a schematic diagram of the installation position of a snap connector and a UHPC bottom liner provided by an embodiment of the present invention;

[0045] Figure 11 This is a schematic diagram of an assembly of an autoclaved aerated concrete layer and a UHPC bottom liner provided by an embodiment of the present invention;

[0046] Figure 12 Schematic diagram of the structure of a UHPC-based aerated concrete floor slab provided in an embodiment of the present invention.

[0047] Description of reference numerals:

[0048] 1-Autoclaved aerated concrete layer; 2-Truss reinforcement; 3-Insulation material; 4-Gas emission direction; 5-Through hole; 6-Snap connector; 1-UHPC bottom liner; 8-Concrete layer. DETAILED DESCRIPTION

[0049] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the following is a detailed description of a UHPC-based aerated concrete floor slab and its construction method proposed in accordance with the present invention, in conjunction with the accompanying drawings and specific implementation methods.

[0050] The aforementioned and other technical contents, features, and effects of the present invention are clearly presented in the following detailed description of the specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a deeper and more specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are provided for reference and illustration purposes only and are not intended to limit the technical solutions of the present invention.

[0051] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations are intended to cover non-exclusive inclusion, such that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the article or device comprising the element.

[0052] Example 1

[0053] The purpose of the present invention is to provide a prefabricated UHPC (ultra-high performance concrete)-aerated concrete composite floor slab equipped with truss reinforcement, addressing the problems of existing composite floor slabs, such as heavy weight, insufficient application of green building materials, and poor thermal and sound insulation. Furthermore, a method for producing an autoclaved aerated concrete floor slab equipped with truss reinforcement is provided, addressing the production process impediment to cutting when using autoclaved aerated concrete slabs as prefabricated composite floor slabs equipped with truss reinforcement.

[0054] See Figure 1 , Figure 1 This is a flow chart of a construction method for a UHPC-based aerated concrete floor slab provided by an embodiment of the present invention. The construction method includes:

[0055] S1: Using a thermal insulation material of a certain thickness as a template, the truss steel bars are inverted and tied and fixed in the template, so that the upper ends of the truss steel bars extend into the template and the lower ends of the truss steel bars are exposed outside the template.

[0056] Specifically, if autoclaved aerated concrete panels with truss reinforcement are to be used as precast base plates for composite slabs, truss reinforcement bars need to be placed inside the panels and exposed from the panels, thus strengthening the overall performance of the precast base plate and the subsequent concrete layer. However, in the current production process, if truss reinforcement bars are placed inside the autoclaved aerated concrete, once the autoclaved aerated concrete has settled and hardened, the steel wire equipment on the production line cannot cut the truss reinforcement bars protruding from the surface layer of the autoclaved aerated concrete. Figure 2 As shown, section II is the cutting point. In this embodiment, a certain thickness of thermal insulation material with a low melting point is used as the top template of autoclaved aerated concrete. Figure 3 As shown, the truss reinforcement is tied upside down and fixed in the formwork, as shown in Figure 4 As shown, the upper end of the truss steel bar 2 extends into the template 3, and the lower end of the truss steel bar 2 is exposed outside the template 3.

[0057] Preferably, the template 3 is made of a low-melting-point solid material such as a polystyrene board, a polyurethane board or an extruded board, and the melting point of the low-melting-point solid material is within 200°C.

[0058] S2: pouring fiber-modified autoclaved aerated concrete material on the side of the template with the truss steel bars, aerating and cutting the material, and forming an aerated concrete body with the truss steel bars.

[0059] In this embodiment, S2 includes:

[0060] Fiber-modified autoclaved aerated concrete material is poured on the side of the template 3 with the truss steel bars and aerated, with the aeration direction 4 being from the template side to the truss steel bars side, to form an autoclaved aerated concrete body with the truss steel bars; cutting is performed at the bottom of the autoclaved aerated concrete body away from the template side, and only the autoclaved aerated concrete body at a certain distance from the bottom of the truss steel bars is cut. In other words, when cutting, the cutting equipment only cuts the autoclaved aerated concrete layer at a certain distance from the bottom of the truss steel bars, such as Figure 5 As shown, the II-II section is the cutting point, forming an aerated concrete body with truss reinforcement, as shown in Figure 6 and Figure 1 As shown in the figure, since the shear resistance between the autoclaved aerated concrete middle layer and the subsequent concrete layer relies on the truss reinforcement, the truss reinforcement should be designed to be high enough to ensure that the top layer of reinforcement is higher than the fiber-modified autoclaved aerated concrete middle layer, thereby forming a reliable connection with the subsequent concrete layer.

[0061] It should be noted that, according to the actual production mold of autoclaved aerated concrete materials, the gas emission height of fiber-modified aerated concrete should be a multiple of 25 mm. The fiber-modified autoclaved aerated concrete is prepared by adding basalt fiber to the autoclaved aerated concrete material, with the addition amount being 0.3% of basalt fiber per cubic meter of dry material, to form fiber-modified autoclaved aerated concrete with high ductility and toughness, which is used as the middle layer material of lightweight composite floor slabs. The main function of the fiber-modified autoclaved aerated concrete middle layer is to reduce the dead weight of the composite floor slab and improve the thermal insulation and sound insulation performance of the composite floor slab. Polypropylene fiber material is added to the slurry and stirred thoroughly so that the polypropylene fiber is evenly dispersed in the autoclaved aerated concrete. During actual production, the fiber addition amount should be appropriately adjusted according to production indicators such as the actual slurry fluidity, pouring stability and gas emission height of the autoclaved aerated concrete. S3: heating and pressurizing the aerated concrete body so that the aerated concrete body generates strength and the formwork melts to expose the upper ends of the truss steel bars, thereby forming a fiber-modified autoclaved aerated concrete board with truss steel bars.

[0062] Specifically, the aerated concrete body is placed in an autoclave and cured at temperatures between 115°C and 1200°C and pressures between 1.3 and 1.5 MPa to develop strength. The formwork is then melted to expose the upper ends of the truss steel bars, thereby forming a fiber-modified autoclaved aerated concrete slab with truss steel bars. The truss steel bars primarily serve to strengthen the connection between the autoclaved aerated concrete layer and the subsequent concrete layer.

[0063] S4: Using snap connectors, the truss steel bars in the fiber-modified autoclaved aerated concrete panel are connected to the UHPC bottom liner to form a fiber-modified autoclaved aerated concrete layer with the UHPC bottom liner.

[0064] In this embodiment, the S4 specifically includes:

[0065] S41: Inverting the fiber-modified autoclaved aerated concrete slab and drilling a plurality of through holes at the bottom truss steel bar positions;

[0066] S42: Casting the lower end of the snap connector on the upper surface of the UHPC bottom liner according to the position of the through hole to form a UHPC bottom liner with a snap connector;

[0067] S43: inserting the upper end of the snap connector on the UHPC bottom liner into the corresponding through hole on the fiber-modified autoclaved aerated concrete slab, and engaging the upper end of the snap connector with the truss steel bar, and making the lower surface of the autoclaved aerated concrete layer fit with the upper surface of the UHPC bottom liner;

[0068] S44: Extending an electric welder from the upper side of the through hole in the fiber-modified autoclaved aerated concrete slab to spot weld the connection points between the snap connector and the truss steel bar to form a fiber-modified autoclaved aerated concrete layer with a UHPC bottom liner.

[0069] Specifically, the prepared fiber-modified autoclaved aerated concrete slab with truss steel bars is inverted, and a through hole 5 of a certain size (4 cm×4 cm) is drilled at the position of the bottom truss steel bars. Figure 8 As shown, the through hole 5 passes through the upper and lower surfaces of the fiber-modified autoclaved aerated concrete slab, and part of the steel bar structure of the truss steel bar is exposed in the through hole 5 to prepare for the connection of the truss steel bar with the snap connector. Figure 9 , Figure 9 This is a schematic diagram of the structure of a snap connector provided by an embodiment of the present invention. The snap connector 6 of this embodiment includes a snap portion at the upper end and a base portion at the lower end. It should be noted that when opening a through hole in the fiber-modified autoclaved aerated concrete base, the autoclaved aerated concrete base must not be extensively damaged.

[0070] The base of the snap connector 6 is cast into the UHPC bottom liner 1 for connection, and an 8112 mm thick UHPC backing plate with a snap connector is made as the bottom liner. Figure 10 As shown in the figure, the UHPC base liner primarily serves as a cushioning layer for the fiber-modified autoclaved aerated concrete (FAC). This prevents moisture absorption from the air into the fiber-modified AAC interlayer, which can lead to degradation of the AAC material and corrosion of the reinforcement. This significantly improves the composite slab's crack resistance. Furthermore, the UHPC base liner provides sufficient pullout resistance for hooks, chandeliers, and other structures.

[0071] Subsequently, the upper end of the snap connector on the UHPC bottom liner is inserted into the corresponding through hole on the fiber-modified autoclaved aerated concrete board, and the upper end of the snap connector is clamped with the truss steel bar, and the lower surface of the autoclaved aerated concrete layer is fitted with the upper surface of the UHPC bottom liner; an electric welder is inserted from the upper side of the through hole in the fiber-modified autoclaved aerated concrete board to spot weld the connection points between the snap connector and the truss steel bar to form a fiber-modified autoclaved aerated concrete layer with a UHPC bottom liner, as shown in FIG. Figure 11 shown.

[0072] S5: pouring ordinary concrete on the fiber-modified autoclaved aerated concrete layer with the UHPC bottom liner to form the aerated concrete floor slab.

[0073] Specifically, ordinary concrete is poured on the fiber-modified autoclaved aerated concrete layer with the UHPC bottom liner to form a concrete layer 8 on the upper surface of the fiber-modified autoclaved aerated concrete layer, and finally form the aerated concrete floor slab. Figure 12 shown.

[0074] This embodiment proposes to use autoclaved aerated concrete with truss steel bars as a prefabricated base plate, and provides a method for manufacturing an autoclaved aerated concrete base plate with truss steel bars; at the same time, it proposes to use a certain thickness of UHPC as a lining material at the bottom of the autoclaved aerated concrete plate to enhance the crack resistance and tensile properties of the base plate, and provide sufficient pull-out resistance for the installation of heavy objects such as chandeliers; in addition, the present invention uses polystyrene boards and other materials with lower melting points as templates, which can effectively solve the problem that the truss steel bars are placed in the autoclaved aerated concrete layer and affect the cutting of the aerated concrete material. This embodiment uses fiber-modified autoclaved aerated concrete material as the middle layer of the lightweight composite floor slab, which greatly increases the application rate of green building materials in prefabricated buildings, greatly reduces the dead weight of the composite floor slab, greatly reduces the seismic effect of the prefabricated structure under earthquake action, and greatly improves the thermal insulation and sound insulation performance of the composite floor slab.

[0075] Example 2

[0076] Based on the above embodiment, this embodiment provides an aerated concrete floor slab based on UHPC. Figure 12 As shown, the aerated concrete floor comprises an autoclaved aerated concrete layer 1, truss steel bars 2, a snap connector 6, a UHPC bottom liner 1 and a concrete layer 8, wherein the lower end of the truss steel bar 2 is embedded in the autoclaved aerated concrete layer 1, a through hole 5 is opened on the autoclaved aerated concrete layer 1, one end of the snap connector 6 is connected to the lower end of the truss steel bar 2 through the through hole 5, and the other end of the snap connector 6 is connected to the upper surface of the UHPC bottom liner 1, so that the lower surface of the autoclaved aerated concrete layer 1 is in contact with the upper surface of the UHPC bottom liner 1; a concrete layer 8 is cast on the upper surface of the autoclaved aerated concrete layer 2 and the inside of the through hole 5, so that the upper end of the truss steel bar 2 is embedded in the concrete layer 8.

[0077] The embodiment of the present invention uses snap-on connectors to connect the truss steel bars and the UHPC liner, effectively ensuring the connection between the base plate and the truss steel bars. The truss steel bars pass through the fiber-modified autoclaved aerated concrete middle layer, effectively ensuring the connection between the autoclaved aerated concrete middle layer and the UHPC liner. The embodiment of the present invention uses UHPC as the composite floor lining, which greatly improves the crack resistance of the composite floor. At the same time, it can provide sufficient pull-out resistance for hooks, chandeliers, etc., effectively preventing water in the air from penetrating into the middle layer of the autoclaved aerated concrete material, causing the performance of the autoclaved aerated concrete material to deteriorate and the steel bars to rust, ensuring that the autoclaved aerated concrete slab can exert its performance and improving the durability of the component.

[0078] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A construction method of aerated concrete floor slab based on UHPC, characterized in that: include: S1: Using a thermal insulation material of a certain thickness as a template, the truss steel bars are tied upside down and fixed in the template so that the upper ends of the truss steel bars extend into the template and the lower ends of the truss steel bars are exposed outside the template; S2: pouring fiber-modified autoclaved aerated concrete material on the side of the template with the truss steel bars, aerating and cutting the material to form an aerated concrete body with the truss steel bars; S3: heating and pressurizing the aerated concrete body so that the aerated concrete body generates strength and the formwork melts to expose the upper ends of the truss steel bars, thereby forming a fiber-modified autoclaved aerated concrete board with truss steel bars; S4: Connecting the truss steel bars in the fiber-modified autoclaved aerated concrete panel to the UHPC bottom liner using a snap connector to form a fiber-modified autoclaved aerated concrete layer with the UHPC bottom liner; S5: pouring ordinary concrete on the fiber-modified autoclaved aerated concrete layer with the UHPC bottom liner to form the aerated concrete floor slab; The S4 includes: S41: Inverting the fiber-modified autoclaved aerated concrete slab and drilling a plurality of through holes at the bottom truss steel bar positions; S42: Casting the lower end of the snap connector on the upper surface of the UHPC bottom liner according to the position of the through hole to form a UHPC bottom liner with a snap connector; S43: inserting the upper end of the snap connector on the UHPC bottom liner into the corresponding through hole on the fiber-modified autoclaved aerated concrete slab, and engaging the upper end of the snap connector with the truss steel bar, and making the lower surface of the autoclaved aerated concrete layer fit with the upper surface of the UHPC bottom liner; S44: Extending an electric welder from the upper side of the through hole in the fiber-modified autoclaved aerated concrete slab to spot weld the connection points between the snap connector and the truss steel bar to form a fiber-modified autoclaved aerated concrete layer with a UHPC bottom liner.

2. The construction method of the UHPC-based aerated concrete floor according to claim 1, characterized in that: The template is a polystyrene board, a polyurethane board or an extruded board.

3. The construction method of the UHPC-based aerated concrete floor according to claim 1, characterized in that: The S2 includes: Casting a fiber-modified autoclaved aerated concrete material on the side of the template with the truss steel bars and performing gas generation, with the gas generation direction being from the template side to the truss steel bars side, to form an autoclaved aerated concrete body with the truss steel bars; The cutting is performed at the bottom of the autoclaved aerated concrete body away from the template, and only the autoclaved aerated concrete body at a certain distance from the bottom of the truss steel bar is cut.

4. The construction method of the UHPC-based aerated concrete floor according to claim 1, characterized in that: The fiber-modified autoclaved aerated concrete is prepared by adding basalt fiber into autoclaved aerated concrete material, with the addition amount of basalt fiber being 0.3% per cubic meter of dry material.

5. The construction method of the UHPC-based aerated concrete floor according to claim 1, characterized in that: The S3 includes: The aerated concrete body is placed in an autoclave, and the autoclaved aerated concrete material is autoclaved and cured at a temperature of 175-200° C. and a pressure of 1.3-1.5 MPa to generate strength, and the formwork is melted to expose the upper end of the truss steel bar, thereby forming a fiber-modified autoclaved aerated concrete board with truss steel bars.

6. The construction method of the UHPC-based aerated concrete floor according to claim 1, characterized in that: The thickness of the UHPC bottom liner is 8-12 mm.

7. The construction method of the UHPC-based aerated concrete floor slab according to claim 6, characterized in that: The side length of the through hole is 3 to 5 cm.

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