A fluidified solidified earth for 3D printing and a method of manufacturing a 3D printed additive structure filled with a fluidified solidified earth for 3D printing

Abstract

This invention discloses a fluidized solidified soil for 3D printing and a method for manufacturing a 3D printed additive structure filled with the fluidized solidified soil. The fluidized solidified soil comprises the following raw materials in parts by weight: 16.7–56.9 parts clay base, 8.5–55.3 parts cementitious material, 0–0.9 parts water-reducing agent, and 19.0–42.6 parts water. The method involves first designing the 3D printed additive structure, then printing the bottom and sides of the support structure, placing reinforcing steel components, pouring the filler, and finally printing the top surface of the support structure. Because this invention uses clay base as the raw material, the cost of the filler is reduced, significantly lowering the self-weight of the 3D printed additive structure. It also effectively utilizes the advantage of soil in keeping building structures warm in winter and cool in summer, reducing energy consumption during normal building use, and simultaneously contributing to the increase in the height of 3D printed building structures.

Description

Technical Field

[0001] This invention belongs to the field of 3D printing in architecture, and particularly relates to a 3D printing fluidized solidified soil and a method for manufacturing 3D printed additive structures filled with 3D printing fluidized solidified soil. Background Technology

[0002] The construction and municipal industries were the first to use this innovative engineering technology of premixed fluidized bed solidified soil. Although the preparation of fluidized bed solidified soil has solved the technical challenges of utilizing local engineering waste soil and formed a technical system of "material development - complete equipment - process optimization - construction organization", it mainly uses ordinary silicate cement and other calcareous cementitious materials as solidifying agents, and is mainly used in scenarios with low added value, such as filling projects.

[0003] 3D printing additive structures represent a future trend in building structure development. Building structures using 3D printing typically involve first printing the support structure, then placing the reinforcing steel components, and finally pouring filler between the support structure and the steel components. However, currently, the filler is generally cast-in-place concrete. When using cast-in-place concrete in building envelopes, the strength requirements for materials are not as high as for load-bearing structures. Using concrete intended for load-bearing structures in envelopes results in a waste of material value, increases building weight and cost, and hinders the increase of 3D printed building height.

[0004] In addition, building envelopes generally have high requirements for the thermal insulation performance of building materials. The main raw materials of fluidized solidified soil are soil and water. After pouring, some of the water evaporates to form air cavities. Soil, water and air cavities have excellent thermal insulation performance, making them very suitable for use in building envelopes. Summary of the Invention

[0005] The purpose of this invention is to address the problems of low added value in the engineering application of fluidized solidified soil and relatively high construction costs of 3D printing, and to propose a method for manufacturing 3D printed additive structures using fluidized solidified soil for 3D printing and filling with 3D printed fluidized solidified soil.

[0006] This invention provides a fluidized bed for 3D printing, which comprises the following raw materials in parts by weight: 16.7-56.9 parts clay base, 8.5-55.3 parts cementitious material, 0-0.9 parts water-reducing agent, and 19.0-42.6 parts water;

[0007] The clay base material includes one or more of the following: river, lake and sea sedimentary soil, municipal silt, engineering mud, engineering waste soil, tailings with a particle size of less than 2.36 mm, sandy loam, loam, clay and silt.

[0008] The clay base material has a moisture content of 7.3~25.6% and a maximum particle size of less than 4.75 mm.

[0009] The cementing material is white silicate cement or magnesium cementing material;

[0010] The water is either groundwater or surface water.

[0011] Furthermore, the white silicate cement has a strength grade of 42.5.

[0012] Furthermore, the magnesium-based cementing material includes magnesium oxychloride cementing material and / or magnesium oxysulfide cementing material;

[0013] The magnesium oxychloride cementitious material comprises the following raw materials in parts by weight: 21.3~27.4 parts of lightly calcined magnesium oxide and 18.1~23.3 parts of magnesium chloride hexahydrate;

[0014] The magnesium sulfate-oxygenated cementitious material comprises the following raw materials in parts by weight: 39.1~40.3 parts of lightly calcined magnesium oxide and 14.5~15.0 parts of magnesium sulfate heptahydrate.

[0015] Furthermore, the water-reducing agent is finally added to the mixed raw material of the 3D printing fluidized solidified soil, or the water-reducing agent is added to water.

[0016] Another object of the present invention is to provide a method for manufacturing a 3D printed additive structure filled with 3D printed fluidized solidified soil, the method comprising the following steps:

[0017] S1. First, design the 3D printing additive structure, and then use 3D printing inkjet material to print the 3D printing support structure using 3D printing equipment.

[0018] S2. After the 3D printed support structure has been printed to a certain height, place the steel reinforcement components.

[0019] S3. After the 3D printed support structure has reached a certain strength, filler material is poured between the 3D printed support structure and the steel reinforcement components. The filler material includes 3D printed fluidized solidified soil.

[0020] S4. After the filler material to be poured has reached a certain strength, continue to print the 3D printed support structure, place the steel reinforcement components, and pour the filler material in sequence until the 3D printed structure reaches the design elevation.

[0021] Furthermore, the 3D printed support structure is a semi-closed structure with an opening at the top, the reinforcing steel member is a reinforcing steel cage and a reinforcing steel connector, the reinforcing steel member is located inside the 3D printed support structure, and the filler is located between the 3D printed support structure and the reinforcing steel member.

[0022] Furthermore, the inkjet printing material for the 3D printed support structure includes the following raw materials in parts by weight: 45-95 parts of 3D printing mortar and 5-55 parts of clay-based recycled aggregate;

[0023] The 3D printing mortar comprises the following raw materials in parts by weight: 37.9-48.8 parts sand, 26.8-40.8 parts curing agent, 2.2-4.2 parts additives, 0.41-0.60 parts chopped fibers, and 15.8-23.8 parts water, wherein the sand particle size is less than 1.18 mm;

[0024] The curing agent includes calcareous cementitious materials and / or magnesium cementitious materials; the calcareous cementitious materials are one or more of ordinary silicate cement, white silicate cement, and alkali-activated cementitious materials.

[0025] The additive is one or more of rapid-hardening sulfoaluminate cement and rapid-hardening ferroaluminate cement.

[0026] The chopped fibers are one or more of polyvinyl alcohol fibers, polyvinyl acrylonitrile fibers, polypropylene fibers, crack-resistant fibers, glass fibers, basalt fibers, carbon fibers, and steel fibers, and the length of the chopped fibers is 3-6 mm.

[0027] Furthermore, the filler comprises the following materials in parts by weight: 75-95 parts of fluidized solidified soil and 5-25 parts of clay-based recycled aggregate, wherein the particle size distribution of the clay-based recycled aggregate is: 5-50 parts of 10mm particle size, 0-30 parts of 20mm particle size, and 0-20 parts of 30mm particle size.

[0028] Furthermore, the clay-based recycled aggregate used in the filler has a 28-day compressive strength greater than 2.0 MPa, a crushing index less than 30%, and a 1-hour water absorption rate less than 20%.

[0029] Furthermore, the fluidized solidified soil has a 3-day compressive strength greater than 0.8 MPa and a 28-day compressive strength greater than 2.3 MPa.

[0030] The fluidized solidified soil for 3D printing of this invention uses clay-based raw materials produced from slurry waste with high water content. Applying it to 3D printing reduces the material cost of 3D printing engineering construction, while increasing the added value of fluidized solidified soil in engineering applications. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a 3D printed beam unit structure filled with 3D-printed fluidized solidified soil.

[0032] Figure 2 This is a schematic diagram of a 3D printed column unit structure filled with 3D-printed fluidized solidified soil.

[0033] Figure 3This is a schematic diagram of a 3D printed plate unit structure filled with 3D fluidized solidified soil.

[0034] Figure 4 This is a schematic diagram of a 3D printed wall unit structure filled with 3D fluidized solidified soil.

[0035] Figure 5 This is a schematic diagram of a 3D printing additive structure manufacturing method that uses 3D-filled fluidized solidified soil.

[0036] Figure 6 This is a schematic diagram of an extrusion molding device for a clay-based recycled aggregate production equipment.

[0037] Figure 7 This is a schematic diagram of an aggregate vibrating screen for a clay-based recycled aggregate production equipment.

[0038] In the diagram: 1. Beam support structure; 2. Beam reinforcement member; 3. Infill material; 4. Bottom surface of beam support structure; 5. Side surface of beam support structure; 6. Top surface of beam support structure; 7. Column support structure; 8. Column reinforcement member; 9. Bottom surface of column support structure; 10. Side surface of column support structure; 11. Top surface of column support structure; 12. Slab support structure; 13. Slab reinforcement member; 14. Bottom surface of slab support structure; 15. Side surface of slab support structure; 16. Top surface of slab support structure; 17. Wall support structure. 18. Wall reinforcement components; 19. Bottom surface of wall support structure; 20. Side surface of wall support structure; 21. Top surface of wall support structure; 22. Feed inlet; 23. Double roller extrusion device; 24. Aggregate vibrating screen; 25. Residual material conveyor belt; 26. Extrusion controller; 27. Double rollers; 28. Extrusion motor; 29. ​​Roller cleaning machine; 30. Hemispherical groove; 31. Screen support; 32. Aggregate screen; 33. Vibrating motor; 34. Flexible support; 35. Flexible cover plate. Detailed Implementation

[0039] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0040] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0041] The fluidized solidified soil for 3D printing provided in this embodiment includes the following raw materials in parts by weight: 16.7~56.9 parts of clay base material, 8.5~55.3 parts of cementitious material, 0~0.9 parts of water-reducing agent, and 19.0~42.6 parts of water;

[0042] The clay base material includes one or more of the following: river, lake and sea sedimentary soil, municipal silt, engineering mud, engineering waste soil, tailings with a particle size of less than 2.36 mm, sandy loam, loam, clay and silt.

[0043] The clay base material has a moisture content of 7.3~25.6% and a maximum particle size of less than 4.75 mm.

[0044] The cementing material is white silicate cement or magnesium cementing material;

[0045] The water is either groundwater or surface water.

[0046] Specifically, the clay-based material used in the fluidized solidified soil for 3D printing is a recycled solid waste, which not only solves the technical problem of efficient and high-value-added resource utilization of solid waste, but also significantly reduces the cost of 3D printing construction.

[0047] Optionally, the white silicate cement has a strength grade of 42.5.

[0048] Optionally, the magnesium cementing material includes magnesium oxychloride cementing material and / or magnesium oxysulfide cementing material;

[0049] The magnesium oxychloride cementitious material comprises the following raw materials in parts by weight: 21.3~27.4 parts of lightly calcined magnesium oxide and 18.1~23.3 parts of magnesium chloride hexahydrate;

[0050] The magnesium sulfate-oxygenated cementitious material comprises the following raw materials in parts by weight: 39.1~40.3 parts of lightly calcined magnesium oxide and 14.5~15.0 parts of magnesium sulfate heptahydrate.

[0051] In this embodiment of the invention, magnesium cementitious material is used as the curing agent for fluidized solidified soil. It not only has good chemical bonding with clay materials, but also produces lighter fluidized solidified soil, which helps to increase the height of 3D printed additive structures. Moreover, the printed buildings have excellent properties of being warm in winter and cool in summer.

[0052] Optionally, the water-reducing agent can be added to the mixed raw material of the 3D printing fluidized solidified soil, or the water-reducing agent can be added directly to the water for use.

[0053] This invention also provides a method for manufacturing a 3D printed additive structure filled with 3D printed fluidized solidified soil, the method comprising the following steps:

[0054] S1. First, design the 3D printing additive structure, and then use 3D printing inkjet material to print the 3D printing support structure using 3D printing equipment.

[0055] S2. After the 3D printed support structure has been printed to a certain height, place the steel reinforcement components.

[0056] S3. After the 3D printed support structure has reached a certain strength, pour the filler material between the 3D printed support structure and the steel reinforcement components.

[0057] S4. After the filler material to be poured has reached a certain strength, continue to repeat the steps of printing the 3D printed support structure, placing the steel reinforcement components, and pouring the filler material until the 3D printed structure reaches the design elevation.

[0058] Optionally, the 3D printed support structure is a semi-closed structure with an open top, the reinforcing steel components are reinforcing cages and reinforcing steel connectors, the filler is 3D printed fluidized solidified soil and clay-based recycled aggregate, the reinforcing steel components are located inside the 3D printed support structure, and the filler is located between the 3D printed support structure and the reinforcing steel components.

[0059] Optionally, the printing inkjet material for the 3D printed support structure includes the following raw materials in parts by weight: 45-95 parts of 3D printing mortar and 5-55 parts of clay-based recycled aggregate;

[0060] The 3D printing mortar comprises the following raw materials in parts by weight: 37.9-48.8 parts sand, 26.8-40.8 parts curing agent, 2.2-4.2 parts additives, 0.41-0.60 parts chopped fibers, and 15.8-23.8 parts water, wherein the sand particle size is less than 1.18 mm;

[0061] The curing agent includes calcareous cementitious materials and / or magnesium cementitious materials, wherein the calcareous cementitious materials are one or more of ordinary silicate cement, white silicate cement, and alkali-activated cementitious materials;

[0062] The additive is one or more of rapid-hardening sulfoaluminate cement and rapid-hardening ferroaluminate cement.

[0063] The chopped fibers are one or more of polyvinyl alcohol fibers, polyvinyl acrylonitrile fibers, polypropylene fibers, crack-resistant fibers, glass fibers, basalt fibers, carbon fibers, and steel fibers, and the length of the chopped fibers is 3-6 mm.

[0064] The embodiments of the present invention employ different activators to fully activate the bonding performance of mineral powder-enhanced cementitious materials, while also helping to reduce the cost of curing agents in 3D printing inkjet materials, thereby further reducing the cost of 3D printing inkjet materials.

[0065] Optionally, the filler includes the following materials in parts by weight: 75-95 parts of fluidized solidified soil for 3D printing and 5-25 parts of clay-based recycled aggregate, wherein the particle size distribution of the clay-based recycled aggregate is: 5-50 parts of 10mm particle size, 0-30 parts of 20mm particle size, and 0-20 parts of 30mm particle size.

[0066] Optionally, the clay-based recycled aggregate used in the filler has a 28-day compressive strength greater than 2.0 MPa, a crushing index less than 30%, and a 1-hour water absorption rate of less than 20%.

[0067] Optionally, the 3d compressive strength of the fluidized solidified soil for 3D printing is greater than 0.8 MPa, and the 28d compressive strength is greater than 2.3 MPa.

[0068] Optionally, clay-based recycled aggregates are prepared by extrusion molding, such as... Figure 6 , 7 As shown, the extrusion molding equipment includes: a feed inlet 22, a roller extrusion device 23, an aggregate vibrating screen 24, a waste material conveyor belt 25, and an extrusion controller 26. The feed inlet 22 is located above the roller extrusion device 23 and is connected to a mixing device via a mixing conveyor belt. The roller extrusion device 23 is located above the aggregate vibrating screen 24, which is located above the waste material conveyor belt 25. The extrusion controller 26 is connected to the extrusion molding equipment. By extruding the mixed material into clay-based recycled aggregate through the extrusion molding equipment, large-scale, non-drying production of colloidal waste with high moisture content is achieved, providing production equipment support for sustainable development and the construction of waste-free cities.

[0069] Optionally, the roller extrusion device 23 includes: rollers 27, an extrusion motor 28, and a roller cleaning machine 29. The surface of each roller 27 is provided with a plurality of hemispherical grooves 30. The rollers 27 are connected to the extrusion motor 28, and the roller cleaning machine 29 is connected to the extrusion controller 26. The roller cleaning machine 29 is located above the rollers 27. By providing hemispherical grooves 30 on the surface of the rollers 27, the mixture of gelatinous waste with high moisture content is extruded into a form such that… Figure 1 The ellipsoidal clay-based recycled aggregate shown allows the clay-based recycled aggregate to be tightly bound together through physical action before molding, reducing the porosity of the clay-based recycled aggregate and ensuring the uniformity and integrity of the particle shape, effectively promoting the strength increase of the clay-based recycled aggregate.

[0070] Optionally, five extrusion molding machines are provided: two with roller groove diameters of 10mm, two with 20mm, and one with 30mm. These machines are arranged in order of distance from the mixing equipment, from closest to furthest. By using extrusion molding machines with different particle sizes, the needs for different applications regarding the particle size of clay-based recycled aggregates can be met. Furthermore, placing the larger-diameter extrusion molding machine closest to the mixing equipment facilitates the extrusion of the remaining material conveyed by the conveyor belt 25 into larger-diameter clay-based recycled aggregates first, and then into smaller-diameter clay-based recycled aggregates.

[0071] Example 1

[0072] like Figure 1 As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a beam unit, which includes: a 3D-printed beam support structure 1, beam steel reinforcement members 2, and filler material 3. The 3D-printed beam support structure is a semi-closed structure with an open top. The bottom surface 4 of the 3D-printed beam support structure has two layers of 3D-printed inkjet material, with a row of steel bars evenly placed between the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 5 of the 3D-printed beam support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 95 parts 3D printing mortar and 5 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 2.2 parts additive, 0.60 parts chopped fiber, and 19.5 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is ordinary silicate cement. The additive is rapid-hardening sulfoaluminate cement. The chopped fiber is crack-resistant fiber with a length of 3 mm. The filler comprises the following raw materials by weight: 75 parts of 3D printing fluidized bed clay and 25 parts of clay-based recycled aggregate; the 3D printing fluidized bed clay comprises the following raw materials by weight: 53.7 parts of clay-based material with a moisture content of 7.3%, 13.4 parts of white silicate cement, 0.7 parts of water-reducing agent, and 32.2 parts of water. The water-reducing agent is added separately to the mixed 3D printing fluidized bed clay. The flexural and compressive strengths of the 3D printing fluidized bed clay are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 10 parts of 10mm particle size, 20 parts of 20mm particle size, and 20 parts of 30mm particle size; the clay-based material is river, lake, and sea sedimentary soil, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted according to the beam unit design strength requirements, the site environment, and test results. The reinforcing steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0073] like Figure 2 As shown, a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil is described. The manufacturing method includes the following steps: first, designing 3D-printed beam units, then printing 3D-printed beam support structures using 3D printing equipment; first printing the bottom surface 4 of the beam, consisting of two layers of inkjet material with reinforcing bars placed between the two layers of inkjet material; then printing the side surface 5 of the beam, consisting of one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3 MPa or more, placing and fixing the position of the reinforcing cage, and then pouring the filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 6 of the beam to wet the top surface 6, and then printing one layer of inkjet material onto the top surface 6 of the beam.

[0074] Example 2

[0075] like Figure 3 As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The additive structure is a column unit, which includes: a 3D-printed column support structure 7, column steel reinforcement components 8, and filler 3. The 3D-printed column support structure is a semi-closed structure with an open top. The bottom surface 9 and the side surface 10 of the 3D-printed column support structure are both single layers of 3D-printed inkjet material. The 3D-printed inkjet material includes the following raw materials by weight: 45 parts of 3D-printed mortar and 55 parts of clay-based recycled aggregate. The 3D-printed mortar includes the following raw materials by weight: 48.8 parts of sand, 26.8 parts of curing agent, 4.2 parts of additive, 0.60 parts of chopped fiber, and 19.6 parts of water. The sand particle size is less than 1.18 mm. The curing agent is white silicate cement, the additive is rapid-hardening aluminoferrite cement, and the chopped fiber is polyvinyl alcohol fiber with a length of 3 mm. The filler comprises the following raw materials in parts by weight: 75 parts of 3D printing fluidized bed soil and 25 parts of clay-based recycled aggregate; the fluidized bed soil comprises the following raw materials in parts by weight: 30.3 parts of clay-based material with a moisture content of 7.3%, 50.7 parts of magnesium cementitious material, 0 parts of water-reducing agent, and 19.0 parts of water; the magnesium cementitious material comprises the following raw materials in parts by weight: 27.4 parts of lightly calcined magnesium oxide and 23.3 parts of magnesium chloride hexahydrate; the flexural and compressive strengths of the 3D printing fluidized bed soil are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 20 parts of 10mm particle size, 20 parts of 20mm particle size, and 10 parts of 30mm particle size; the clay-based material is municipal silt, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mixing ratio of the 3D printing inkjet material and filler is adjusted according to the design strength requirements of the column unit, the site environment and test results, and the steel reinforcement components are configured according to the column bearing capacity design requirements and 3D printing technology requirements.

[0076] like Figure 2As shown, a method for manufacturing a 3D printed additive structure using 3D printed fluidized solidified soil as filler is disclosed. The manufacturing method includes the following steps: first, designing 3D printed column units, then printing 3D printed column support structures using 3D printing equipment, first printing the column bottom surface 9, then printing the beam side surface 10, both with one layer of inkjet material; after printing the column support structure, when the compressive strength of the column support structure reaches more than 3 MPa, placing and fixing the position of the reinforcing cage, and then pouring the filler material; when the compressive strength of the filler material reaches more than 3 MPa, spraying tap water on the column top surface 11 to wet the column top surface 11, and then printing one layer of inkjet material on the column top surface 11.

[0077] Example 3

[0078] like Figure 4As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a plate unit, which includes: a 3D-printed plate support structure 12, plate steel reinforcement members 13, and filler 3. The 3D-printed plate support structure is a semi-closed structure with an open top. The bottom surface 14 of the 3D-printed plate support structure has two layers of 3D-printed inkjet material, and a row of steel bars is evenly placed in the middle of the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 15 of the 3D-printed plate support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 45 parts 3D printing mortar and 55 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 4.2 parts additive, 0.41 parts chopped fiber, and 15.8 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is an alkali-activated cementitious material, and the activator used in the alkali-activated cementitious material is a sulfate activator. The sulfate activator comprises the following raw materials in parts by weight: 27 parts quicklime powder, 67 parts gypsum dihydrate, and 6 parts sodium sulfate. The additive is rapid-hardening sulfoaluminate cement, and the chopped fiber is polyvinyl alcohol acrylonitrile fiber with a length of 4 mm. The filler material comprises the following raw materials by weight: 95 parts of 3D printing fluidized bed soil and 5 parts of clay-based recycled aggregate; the 3D printing fluidized bed soil comprises the following raw materials by weight: 16.7 parts of clay-based material with a moisture content of 7.3%, 53.6 parts of magnesium cementitious material, 0 parts of water-reducing agent, and 29.7 parts of water; the magnesium cementitious material comprises the following raw materials by weight: 39.1 parts of light-burned magnesium oxide and 14.5 parts of magnesium sulfate heptahydrate; the flexural and compressive strengths of the 3D printing fluidized bed soil are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 50 parts of 10mm particle size; the clay-based material is engineering slurry, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler material is adjusted according to the design strength requirements of the plate unit, the site environment, and the test results; the reinforcing steel components are configured according to the plate bearing capacity design requirements and the 3D printing technology requirements.

[0079] like Figure 2As shown, this embodiment describes a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil. The manufacturing method includes the following steps: first, designing a 3D printed plate unit; then, printing a 3D printed plate support structure using a 3D printing device; first, printing the bottom surface 14 of the plate, which consists of two layers of inkjet material, with reinforcing bars placed between the two layers of inkjet material; then, printing the side surface 15 of the plate, which consists of one layer of inkjet material; after printing the plate support structure, when the compressive strength of the plate support structure reaches 3 MPa or more, placing a reinforcing cage and fixing its position, followed by pouring filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 16 of the plate to wet the top surface 16, and then printing one layer of inkjet material onto the top surface 16 of the plate.

[0080] Example 4

[0081] like Figure 5As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a wall unit, which includes: a 3D-printed wall support structure 17, wall reinforcement components 18, and filler 3. The 3D-printed wall support structure is a semi-closed structure with an open top. The bottom surface 19 and the side surface 20 of the 3D-printed wall support structure are both one layer of 3D-printed inkjet material. The 3D-printed inkjet material includes the following raw materials by weight: 50 parts of 3D-printed mortar and 50 parts of clay-based recycled aggregate. The 3D-printed mortar includes the following raw materials by weight: 37.9 parts of sand, 40.8 parts of curing agent, 2.2 parts of additives, 0.60 parts of chopped fiber, and 23.8 parts of water. The sand particle size is less than 1.18 mm. The curing agent is a magnesium cementitious material, which includes magnesium oxychloride cementitious material, magnesium sulfide cementitious material, and phosphate cementitious material in a 5:3 ratio. 2. Composition; The magnesium oxychloride cementitious material comprises the following raw materials in parts by weight: 54.1 parts light-burned magnesium oxide and 45.9 parts magnesium chloride hexahydrate; The magnesium oxysulfate cementitious material comprises the following raw materials in parts by weight: 60.1 parts light-burned magnesium oxide and 39.9 parts magnesium sulfate heptahydrate; The phosphate cementitious material comprises: 47.6 parts deburned magnesium oxide, 34.3 parts potassium dihydrogen phosphate, and 6.0 parts borax; The additive is rapid-hardening aluminoferrite cement; The chopped fiber is polypropylene fiber, and the chopped fiber length is 6 mm. The filler comprises the following raw materials in parts by weight: 75 parts of fluidized bed soil for 3D printing and 25 parts of clay-based recycled aggregate; the fluidized bed soil for 3D printing comprises the following raw materials in parts by weight: 34.9 parts of clay-based material with a moisture content of 7.3%, 39.4 parts of magnesium cementitious material, 0 parts of water-reducing agent, and 25.7 parts of water; the magnesium cementitious material comprises the following raw materials in parts by weight: 21.3 parts of lightly calcined magnesium oxide and 18.1 parts of magnesium chloride hexahydrate; the flexural and compressive strengths of the fluidized bed soil for 3D printing are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 30 parts of 10mm particle size, 10 parts of 20mm particle size, and 10 parts of 30mm particle size; the clay-based material is engineering waste soil, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mixing ratio of the 3D printing inkjet material and filler is adjusted according to the design strength requirements of the wall unit, the site environment, and the test results. The steel reinforcement components are configured according to the wall bearing capacity design requirements and the 3D printing technology requirements.

[0082] like Figure 2As shown, this embodiment describes a method for manufacturing a 3D-printed additive structure using 3D-printed fluidized solidified soil as filler. The manufacturing method includes the following steps: first, designing a 3D-printed wall unit; then, printing a 3D-printed wall support structure using a 3D printing device, first printing the bottom surface 19 of the plate, then printing the side surface 20 of the plate, both with one layer of inkjet material; after printing the wall support structure, when the compressive strength of the wall support structure reaches 3 MPa or more, placing steel reinforcement components, and then pouring filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 21 of the wall to wet the top surface 21, and then printing one layer of inkjet material onto the top surface 21 of the wall.

[0083] Example 5

[0084] like Figure 4As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a plate unit, which includes: a 3D-printed plate support structure 12, plate steel reinforcement members 13, and filler 3. The 3D-printed plate support structure is a semi-closed structure with an open top. The bottom surface 14 of the 3D-printed plate support structure has two layers of 3D-printed inkjet material, and a row of steel bars is evenly placed in the middle of the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 15 of the 3D-printed plate support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 45 parts 3D printing mortar and 55 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 4.2 parts additive, 0.41 parts chopped fiber, and 15.8 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is an alkali-activated cementitious material, and the activator used in the alkali-activated cementitious material is a sulfate activator. The sulfate activator comprises the following raw materials in parts by weight: 27 parts quicklime powder, 67 parts gypsum dihydrate, and 6 parts sodium sulfate. The additive is rapid-hardening sulfoaluminate cement, and the chopped fiber is polyvinyl alcohol acrylonitrile fiber with a length of 4 mm. The filler material comprises the following raw materials by weight: 95 parts of 3D printing fluidized bed soil and 5 parts of clay-based recycled aggregate; the 3D printing fluidized bed soil comprises the following raw materials by weight: 17.3 parts of clay-based material with a moisture content of 7.3%, 55.3 parts of magnesium cementitious material, 0 parts of water-reducing agent, and 27.5 parts of water; the magnesium cementitious material comprises the following raw materials by weight: 40.3 parts of light-burned magnesium oxide and 15.0 parts of magnesium sulfate heptahydrate; the flexural and compressive strengths of the 3D printing fluidized bed soil are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 50 parts of 10mm particle size; the clay-based material is tailings with a particle size less than 2.36mm, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler material is adjusted according to the design strength requirements of the plate unit, the site environment, and the test results; the reinforcing steel components are configured according to the plate bearing capacity design requirements and the 3D printing technology requirements.

[0085] like Figure 2As shown, this embodiment describes a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil. The manufacturing method includes the following steps: first, designing a 3D printed plate unit; then, printing a 3D printed plate support structure using a 3D printing device; first, printing the bottom surface 14 of the plate, which consists of two layers of inkjet material, with reinforcing bars placed between the two layers of inkjet material; then, printing the side surface 15 of the plate, which consists of one layer of inkjet material; after printing the plate support structure, when the compressive strength of the plate support structure reaches 3 MPa or more, placing a reinforcing cage and fixing its position, followed by pouring filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 16 of the plate to wet the top surface 16, and then printing one layer of inkjet material onto the top surface 16 of the plate.

[0086] Example 6

[0087] like Figure 1 As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a beam unit, which includes: a 3D-printed beam support structure 1, beam steel reinforcement members 2, and filler material 3. The 3D-printed beam support structure is a semi-closed structure with an open top. The bottom surface 4 of the 3D-printed beam support structure has two layers of 3D-printed inkjet material, with a row of steel bars evenly placed between the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 5 of the 3D-printed beam support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 95 parts 3D printing mortar and 5 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 2.2 parts additive, 0.60 parts chopped fiber, and 19.5 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is ordinary silicate cement. The additive is rapid-hardening sulfoaluminate cement. The chopped fiber is crack-resistant fiber with a length of 3 mm. The filler comprises the following raw materials by weight: 75 parts of 3D printing fluidized bed clay and 25 parts of clay-based recycled aggregate; the 3D printing fluidized bed clay comprises the following raw materials by weight: 49.1 parts of clay-based material with a moisture content of 7.3%, 14.7 parts of white silicate cement, 0.8 parts of water-reducing agent, and 35.4 parts of water. The water-reducing agent is added separately to the mixed 3D printing fluidized bed clay. The flexural and compressive strengths of the 3D printing fluidized bed clay are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 10 parts of 10mm particle size, 20 parts of 20mm particle size, and 20 parts of 30mm particle size; the clay-based material is river, lake, and sea sedimentary soil, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted according to the beam unit design strength requirements, the site environment, and test results. The reinforcing steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0088] like Figure 2 As shown, a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil is described. The manufacturing method includes the following steps: first, designing 3D-printed beam units, then printing 3D-printed beam support structures using 3D printing equipment; first printing the bottom surface 4 of the beam, consisting of two layers of inkjet material with reinforcing bars placed between the two layers of inkjet material; then printing the side surface 5 of the beam, consisting of one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3 MPa or more, placing and fixing the position of the reinforcing cage, and then pouring the filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 6 of the beam to wet the top surface 6, and then printing one layer of inkjet material onto the top surface 6 of the beam.

[0089] Example 7

[0090] like Figure 1As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a beam unit, which includes: a 3D-printed beam support structure 1, beam steel reinforcement members 2, and filler material 3. The 3D-printed beam support structure is a semi-closed structure with an open top. The bottom surface 4 of the 3D-printed beam support structure has two layers of 3D-printed inkjet material, with a row of steel bars evenly placed between the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 5 of the 3D-printed beam support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 95 parts 3D printing mortar and 5 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 2.2 parts additive, 0.60 parts chopped fiber, and 19.5 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is ordinary silicate cement. The additive is rapid-hardening sulfoaluminate cement. The chopped fiber is crack-resistant fiber with a length of 3 mm. The filler comprises the following raw materials by weight: 75 parts of 3D printing fluidized bed clay and 25 parts of clay-based recycled aggregate; the 3D printing fluidized bed clay comprises the following raw materials by weight: 52.6 parts of clay-based material with a moisture content of 7.3%, 14.9 parts of white silicate cement, 0.9 parts of water-reducing agent, and 31.6 parts of water. The water-reducing agent is added separately to the mixed 3D printing fluidized bed clay. The flexural and compressive strengths of the 3D printing fluidized bed clay are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 10 parts of 10mm particle size, 20 parts of 20mm particle size, and 20 parts of 30mm particle size; the clay-based material is municipal silt, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted according to the beam unit design strength requirements, the site environment, and test results. The reinforcing steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0091] like Figure 2 As shown, a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil is described. The manufacturing method includes the following steps: first, designing 3D-printed beam units, then printing 3D-printed beam support structures using 3D printing equipment; first printing the bottom surface 4 of the beam, consisting of two layers of inkjet material with reinforcing bars placed between the two layers of inkjet material; then printing the side surface 5 of the beam, consisting of one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3 MPa or more, placing and fixing the position of the reinforcing cage, and then pouring the filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 6 of the beam to wet the top surface 6, and then printing one layer of inkjet material onto the top surface 6 of the beam.

[0092] Example 8

[0093] like Figure 1 As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a beam unit, which includes: a 3D-printed beam support structure 1, beam steel reinforcement members 2, and filler material 3. The 3D-printed beam support structure is a semi-closed structure with an open top. The bottom surface 4 of the 3D-printed beam support structure has two layers of 3D-printed inkjet material, with a row of steel bars evenly placed between the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 5 of the 3D-printed beam support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 95 parts 3D printing mortar and 5 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 2.2 parts additive, 0.60 parts chopped fiber, and 19.5 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is ordinary silicate cement. The additive is rapid-hardening sulfoaluminate cement. The chopped fiber is crack-resistant fiber with a length of 3 mm. The filler comprises the following raw materials by weight: 75 parts of 3D printing fluidized bed soil and 25 parts of clay-based recycled aggregate; the 3D printing fluidized bed soil comprises the following raw materials by weight: 44.5 parts of clay-based material with a moisture content of 25.6%, 13.4 parts of white silicate cement, 0.5 parts of water-reducing agent, and 41.6 parts of water. The water-reducing agent is added separately to the mixed 3D printing fluidized bed soil raw material. The flexural and compressive strengths of the 3D printing fluidized bed soil are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 10 parts of 10mm particle size, 20 parts of 20mm particle size, and 20 parts of 30mm particle size; the clay-based material is sandy loam, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted according to the beam unit design strength requirements, the site environment, and test results. The reinforcing steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0094] like Figure 2 As shown, a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil is described. The manufacturing method includes the following steps: first, designing 3D-printed beam units, then printing 3D-printed beam support structures using 3D printing equipment; first printing the bottom surface 4 of the beam, consisting of two layers of inkjet material with reinforcing bars placed between the two layers of inkjet material; then printing the side surface 5 of the beam, consisting of one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3 MPa or more, placing and fixing the position of the reinforcing cage, and then pouring the filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 6 of the beam to wet the top surface 6, and then printing one layer of inkjet material onto the top surface 6 of the beam.

[0095] Example 9

[0096] like Figure 1 As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a beam unit, which includes: a 3D-printed beam support structure 1, beam steel reinforcement members 2, and filler material 3. The 3D-printed beam support structure is a semi-closed structure with an open top. The bottom surface 4 of the 3D-printed beam support structure has two layers of 3D-printed inkjet material, with a row of steel bars evenly placed between the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 5 of the 3D-printed beam support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 95 parts 3D printing mortar and 5 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 2.2 parts additive, 0.60 parts chopped fiber, and 19.5 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is ordinary silicate cement. The additive is rapid-hardening sulfoaluminate cement. The chopped fiber is crack-resistant fiber with a length of 3 mm. The filler comprises the following raw materials by weight: 75 parts of 3D printing fluidized bed soil and 25 parts of clay-based recycled aggregate; the 3D printing fluidized bed soil comprises the following raw materials by weight: 45.6 parts of clay-based material with a moisture content of 25.6%, 11.4 parts of white silicate cement, 0.4 parts of water-reducing agent, and 42.6 parts of water. The water-reducing agent is added separately to the mixed 3D printing fluidized bed soil raw material. The flexural and compressive strengths of the 3D printing fluidized bed soil are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 10 parts of 10mm particle size, 20 parts of 20mm particle size, and 20 parts of 30mm particle size; the clay-based material is loam, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted according to the beam unit design strength requirements, the site environment, and test results. The reinforcing steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0097] like Figure 2As shown, a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil is described. The manufacturing method includes the following steps: first, designing 3D-printed beam units, then printing 3D-printed beam support structures using 3D printing equipment; first printing the bottom surface 4 of the beam, consisting of two layers of inkjet material with reinforcing bars placed between the two layers of inkjet material; then printing the side surface 5 of the beam, consisting of one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3 MPa or more, placing and fixing the position of the reinforcing cage, and then pouring the filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 6 of the beam to wet the top surface 6, and then printing one layer of inkjet material onto the top surface 6 of the beam.

[0098] Example 10

[0099] like Figure 1 As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a beam unit, which includes: a 3D-printed beam support structure 1, beam steel reinforcement members 2, and filler material 3. The 3D-printed beam support structure is a semi-closed structure with an open top. The bottom surface 4 of the 3D-printed beam support structure has two layers of 3D-printed inkjet material, with a row of steel bars evenly placed between the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 5 of the 3D-printed beam support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 95 parts 3D printing mortar and 5 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 2.2 parts additive, 0.60 parts chopped fiber, and 19.5 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is ordinary silicate cement. The additive is rapid-hardening sulfoaluminate cement. The chopped fiber is crack-resistant fiber with a length of 3 mm. The filler comprises the following raw materials by weight: 75 parts of 3D printing fluidized bed clay and 25 parts of clay-based recycled aggregate; the 3D printing fluidized bed clay comprises the following raw materials by weight: 45.6 parts of clay-based material with a moisture content of 14.3%, 11.4 parts of white silicate cement, 0.4 parts of water-reducing agent, and 42.6 parts of water. The water-reducing agent is added separately to the mixed 3D printing fluidized bed clay raw material. The flexural and compressive strengths of the 3D printing fluidized bed clay are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 10 parts of 10mm particle size, 20 parts of 20mm particle size, and 20 parts of 30mm particle size; the clay-based material is clay, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted according to the beam unit design strength requirements, the site environment, and test results. The reinforcing steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0100] like Figure 2 As shown, a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil is described. The manufacturing method includes the following steps: first, designing 3D-printed beam units, then printing 3D-printed beam support structures using 3D printing equipment; first printing the bottom surface 4 of the beam, consisting of two layers of inkjet material with reinforcing bars placed between the two layers of inkjet material; then printing the side surface 5 of the beam, consisting of one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3 MPa or more, placing and fixing the position of the reinforcing cage, and then pouring the filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 6 of the beam to wet the top surface 6, and then printing one layer of inkjet material onto the top surface 6 of the beam.

[0101] Example 11

[0102] like Figure 1As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a beam unit, which includes: a 3D-printed beam support structure 1, beam steel reinforcement members 2, and filler material 3. The 3D-printed beam support structure is a semi-closed structure with an open top. The bottom surface 4 of the 3D-printed beam support structure has two layers of 3D-printed inkjet material, with a row of steel bars evenly placed between the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 5 of the 3D-printed beam support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 95 parts 3D printing mortar and 5 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 2.2 parts additive, 0.60 parts chopped fiber, and 19.5 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is ordinary silicate cement. The additive is rapid-hardening sulfoaluminate cement. The chopped fiber is crack-resistant fiber with a length of 3 mm. The filler comprises the following raw materials by weight: 75 parts of 3D printing fluidized bed clay and 25 parts of clay-based recycled aggregate; the 3D printing fluidized bed clay comprises the following raw materials by weight: 44.5 parts of clay-based material with a moisture content of 14.3%, 13.4 parts of white silicate cement, 0.5 parts of water-reducing agent, and 41.6 parts of water. The water-reducing agent is added separately to the mixed 3D printing fluidized bed clay raw material. The flexural and compressive strengths of the 3D printing fluidized bed clay are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 10 parts of 10mm particle size, 20 parts of 20mm particle size, and 20 parts of 30mm particle size; the clay-based material is silt, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted according to the beam unit design strength requirements, the site environment, and test results. The reinforcing steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0103] like Figure 2 As shown, a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil is described. The manufacturing method includes the following steps: first, designing 3D-printed beam units, then printing 3D-printed beam support structures using 3D printing equipment; first printing the bottom surface 4 of the beam, consisting of two layers of inkjet material with reinforcing bars placed between the two layers of inkjet material; then printing the side surface 5 of the beam, consisting of one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3 MPa or more, placing and fixing the position of the reinforcing cage, and then pouring the filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 6 of the beam to wet the top surface 6, and then printing one layer of inkjet material onto the top surface 6 of the beam.

[0104] Example 12

[0105] like Figure 1 As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a beam unit, which includes: a 3D-printed beam support structure 1, beam steel reinforcement members 2, and filler material 3. The 3D-printed beam support structure is a semi-closed structure with an open top. The bottom surface 4 of the 3D-printed beam support structure has two layers of 3D-printed inkjet material, with a row of steel bars evenly placed between the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 5 of the 3D-printed beam support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 95 parts 3D printing mortar and 5 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 2.2 parts additive, 0.60 parts chopped fiber, and 19.5 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is ordinary silicate cement. The additive is rapid-hardening sulfoaluminate cement. The chopped fiber is crack-resistant fiber with a length of 3 mm. The filler comprises the following raw materials by weight: 75 parts of 3D printing fluidized bed soil and 25 parts of clay-based recycled aggregate; the 3D printing fluidized bed soil comprises the following raw materials by weight: 54.7 parts of clay-based material with a moisture content of 7.3%, 11.9 parts of white silicate cement, 0.6 parts of water-reducing agent, and 32.8 parts of water. The water-reducing agent is added separately to the mixed 3D printing fluidized bed soil raw material. The flexural and compressive strengths of the 3D printing fluidized bed soil are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 10 parts of 10mm particle size, 20 parts of 20mm particle size, and 20 parts of 30mm particle size; the clay-based material is engineering waste soil, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted according to the beam unit design strength requirements, the site environment, and test results. The reinforcing steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0106] like Figure 2 As shown, a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil is described. The manufacturing method includes the following steps: first, designing 3D-printed beam units, then printing 3D-printed beam support structures using 3D printing equipment; first printing the bottom surface 4 of the beam, consisting of two layers of inkjet material with reinforcing bars placed between the two layers of inkjet material; then printing the side surface 5 of the beam, consisting of one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3 MPa or more, placing and fixing the position of the reinforcing cage, and then pouring the filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 6 of the beam to wet the top surface 6, and then printing one layer of inkjet material onto the top surface 6 of the beam.

[0107] Example 13

[0108] like Figure 1 As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a beam unit, which includes: a 3D-printed beam support structure 1, beam steel reinforcement members 2, and filler material 3. The 3D-printed beam support structure is a semi-closed structure with an open top. The bottom surface 4 of the 3D-printed beam support structure has two layers of 3D-printed inkjet material, with a row of steel bars evenly placed between the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 5 of the 3D-printed beam support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 95 parts 3D printing mortar and 5 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 2.2 parts additive, 0.60 parts chopped fiber, and 19.5 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is ordinary silicate cement. The additive is rapid-hardening sulfoaluminate cement. The chopped fiber is crack-resistant fiber with a length of 3 mm. The filler material comprises the following raw materials by weight: 75 parts of 3D printing fluidized bed soil and 25 parts of clay-based recycled aggregate; the 3D printing fluidized bed soil comprises the following raw materials by weight: 54.7 parts of clay-based material with a moisture content of 7.3%, 11.9 parts of white silicate cement, 0.6 parts of water-reducing agent, and 32.8 parts of water. The water-reducing agent is first added to 1 part of water and stirred before being added to the 3D printing fluidized bed soil. The flexural and compressive strengths of the 3D printing fluidized bed soil are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 10 parts of 10mm particle size, 20 parts of 20mm particle size, and 20 parts of 30mm particle size; the clay-based material is engineering waste soil, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler material is adjusted according to the design strength requirements of the beam unit, the site environment, and the test results. The reinforcing steel components are configured according to the beam bearing capacity design requirements and the 3D printing technology requirements.

[0109] like Figure 2As shown, a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil is described. The manufacturing method includes the following steps: first, designing 3D-printed beam units, then printing 3D-printed beam support structures using 3D printing equipment; first printing the bottom surface 4 of the beam, consisting of two layers of inkjet material with reinforcing bars placed between the two layers of inkjet material; then printing the side surface 5 of the beam, consisting of one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3 MPa or more, placing and fixing the position of the reinforcing cage, and then pouring the filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 6 of the beam to wet the top surface 6, and then printing one layer of inkjet material onto the top surface 6 of the beam.

[0110] Example 14

[0111] like Figure 1 As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a beam unit, which includes: a 3D-printed beam support structure 1, beam steel reinforcement members 2, and filler material 3. The 3D-printed beam support structure is a semi-closed structure with an open top. The bottom surface 4 of the 3D-printed beam support structure has two layers of 3D-printed inkjet material, with a row of steel bars evenly placed between the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 5 of the 3D-printed beam support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 95 parts 3D printing mortar and 5 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 2.2 parts additive, 0.60 parts chopped fiber, and 19.5 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is ordinary silicate cement. The additive is rapid-hardening sulfoaluminate cement. The chopped fiber is crack-resistant fiber with a length of 3 mm. The filler material comprises the following raw materials by weight: 75 parts of 3D printing fluidized bed soil and 25 parts of clay-based recycled aggregate; the 3D printing fluidized bed soil comprises the following raw materials by weight: 55.8 parts of clay-based material with a moisture content of 7.3%, 10.2 parts of white silicate cement, 0.5 parts of water-reducing agent, and 33.5 parts of water. The water-reducing agent is first added to 1 part of water and stirred before being added to the 3D printing fluidized bed soil. The flexural and compressive strengths of the 3D printing fluidized bed soil are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 10 parts of 10mm particle size, 20 parts of 20mm particle size, and 20 parts of 30mm particle size; the clay-based material is engineering waste soil, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler material is adjusted according to the design strength requirements of the beam unit, the site environment, and the test results. The reinforcing steel components are configured according to the beam bearing capacity design requirements and the 3D printing technology requirements.

[0112] like Figure 2 As shown, a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil is described. The manufacturing method includes the following steps: first, designing 3D-printed beam units, then printing 3D-printed beam support structures using 3D printing equipment; first printing the bottom surface 4 of the beam, consisting of two layers of inkjet material with reinforcing bars placed between the two layers of inkjet material; then printing the side surface 5 of the beam, consisting of one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3 MPa or more, placing and fixing the position of the reinforcing cage, and then pouring the filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 6 of the beam to wet the top surface 6, and then printing one layer of inkjet material onto the top surface 6 of the beam.

[0113] Example 15

[0114] like Figure 1As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a beam unit, which includes: a 3D-printed beam support structure 1, beam steel reinforcement members 2, and filler material 3. The 3D-printed beam support structure is a semi-closed structure with an open top. The bottom surface 4 of the 3D-printed beam support structure has two layers of 3D-printed inkjet material, with a row of steel bars evenly placed between the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 5 of the 3D-printed beam support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 95 parts 3D printing mortar and 5 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 2.2 parts additive, 0.60 parts chopped fiber, and 19.5 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is ordinary silicate cement. The additive is rapid-hardening sulfoaluminate cement. The chopped fiber is crack-resistant fiber with a length of 3 mm. The filler material comprises the following raw materials by weight: 75 parts of 3D printing fluidized bed soil and 25 parts of clay-based recycled aggregate; the 3D printing fluidized bed soil comprises the following raw materials by weight: 56.9 parts of clay-based material with a moisture content of 7.3%, 8.5 parts of white silicate cement, 0.5 parts of water-reducing agent, and 34.1 parts of water. The water-reducing agent is first added to 1 part of water and stirred before being added to the 3D printing fluidized bed soil. The flexural and compressive strengths of the 3D printing fluidized bed soil are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 10 parts of 10mm particle size, 20 parts of 20mm particle size, and 20 parts of 30mm particle size; the clay-based material is engineering waste soil, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler material is adjusted according to the design strength requirements of the beam unit, the site environment, and the test results. The reinforcing steel components are configured according to the beam bearing capacity design requirements and the 3D printing technology requirements.

[0115] like Figure 2 As shown, a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil is described. The manufacturing method includes the following steps: first, designing 3D-printed beam units, then printing 3D-printed beam support structures using 3D printing equipment; first printing the bottom surface 4 of the beam, consisting of two layers of inkjet material with reinforcing bars placed between the two layers of inkjet material; then printing the side surface 5 of the beam, consisting of one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3 MPa or more, placing and fixing the position of the reinforcing cage, and then pouring the filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 6 of the beam to wet the top surface 6, and then printing one layer of inkjet material onto the top surface 6 of the beam.

[0116] Example 16

[0117] like Figure 1 As shown, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The 3D-printed additive structure is a beam unit, which includes: a 3D-printed beam support structure 1, beam steel reinforcement members 2, and filler material 3. The 3D-printed beam support structure is a semi-closed structure with an open top. The bottom surface 4 of the 3D-printed beam support structure has two layers of 3D-printed inkjet material, with a row of steel bars evenly placed between the two layers of 3D-printed inkjet material. The type and quantity of the steel bars are placed according to the ultimate bearing capacity of the beam and the requirements of 3D printing technology. The side surface 5 of the 3D-printed beam support structure has one layer of 3D-printed inkjet material. The 3D printing inkjet material comprises the following raw materials in parts by weight: 95 parts 3D printing mortar and 5 parts clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 parts sand, 40.8 parts curing agent, 2.2 parts additive, 0.60 parts chopped fiber, and 19.5 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is ordinary silicate cement. The additive is rapid-hardening sulfoaluminate cement. The chopped fiber is crack-resistant fiber with a length of 3 mm. The filler material comprises the following raw materials by weight: 75 parts of 3D printing fluidized bed soil and 25 parts of clay-based recycled aggregate; the 3D printing fluidized bed soil comprises the following raw materials by weight: 56.8 parts of clay-based material with a moisture content of 7.3%, 8.5 parts of white silicate cement, 0.7 parts of water-reducing agent, and 34.1 parts of water. The water-reducing agent is first added to 1 part of water and stirred before being added to the 3D printing fluidized bed soil. The flexural and compressive strengths of the 3D printing fluidized bed soil are shown in Table 1; the particle size distribution of the clay-based recycled aggregate is: 10 parts of 10mm particle size, 20 parts of 20mm particle size, and 20 parts of 30mm particle size; the clay-based material is engineering waste soil, and the maximum particle size of the clay-based material is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler material is adjusted according to the design strength requirements of the beam unit, the site environment, and the test results. The reinforcing steel components are configured according to the beam bearing capacity design requirements and the 3D printing technology requirements.

[0118] like Figure 2 As shown, a method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil is described. The manufacturing method includes the following steps: first, designing 3D-printed beam units, then printing 3D-printed beam support structures using 3D printing equipment; first printing the bottom surface 4 of the beam, consisting of two layers of inkjet material with reinforcing bars placed between the two layers of inkjet material; then printing the side surface 5 of the beam, consisting of one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3 MPa or more, placing and fixing the position of the reinforcing cage, and then pouring the filler material; when the compressive strength of the filler material reaches 3 MPa or more, spraying tap water onto the top surface 6 of the beam to wet the top surface 6, and then printing one layer of inkjet material onto the top surface 6 of the beam.

[0119] The effects of Examples 1-16 are compared in Table 1.

[0120] Table 1. Flexural and compressive strengths (MPa) of fluidized solidified soil for 3D printing

[0121]

[0122] Note: The " / " in the table indicates that the item was not tested for that age group.

[0123] This invention utilizes clay-based recycled aggregates produced from high-moisture slurry waste, which are inexpensive and readily available. Applying these aggregates to 3D printing additive structures not only enables low-cost, large-scale production of coarse aggregates for 3D printing but also effectively improves the resource utilization rate and added value of recycled aggregates, reducing the material costs of 3D printing engineering construction and increasing the added value of fluidized solidified soil engineering applications. The magnesium-based cementitious material used as the solidifying agent for the fluidized solidified soil not only has good chemical bonding with clay materials but also produces lighter fluidized solidified soil, which helps to increase the height of 3D printed additive structures.

[0124] By incorporating clay-based recycled aggregates and fluidized bed soil for 3D printing into 3D printed structures, the cost and weight of 3D printed buildings can be significantly reduced. Furthermore, the fluidized bed soil fully leverages the advantages of soil in construction, significantly improving the thermal insulation properties of 3D printed buildings and reducing energy consumption during normal use. In addition, the fluidized bed soil effectively utilizes solid waste with high water content in advanced construction technologies, achieving efficient and high-value-added engineering applications of solid waste with high water content and fluidized bed soil.

[0125] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that after reading this application specification, they can still modify or make equivalent substitutions to the specific implementation of the present invention, but these modifications or changes do not depart from the protection scope of the pending claims of the present invention.

Claims

1. A method for manufacturing a 3D printed additive structure filled with 3D-printed fluidized solidified soil, characterized in that, The manufacturing method includes the following steps: S1. First, design the 3D printing additive structure, and then use 3D printing inkjet material to print the 3D printing support structure using 3D printing equipment. S2. After the 3D printed support structure has been printed to a certain height, place the steel reinforcement components. S3. After the 3D printed support structure has reached a certain strength, filler material is poured between the 3D printed support structure and the steel reinforcement components. The filler material includes 3D printed fluidized solidified soil. S4. After the filler material to be poured has reached a certain strength, continue to print the 3D printed support structure, place the steel reinforcement components, and pour the filler material in sequence until the 3D printed structure reaches the design elevation. The fluidized solidified soil for 3D printing comprises the following raw materials in parts by weight: 16.7-56.9 parts clay base, 8.5-55.3 parts cementitious material, 0-0.9 parts water-reducing agent, and 19.0-42.6 parts water; The clay-based material includes one or more of the following: river, lake, and sea sedimentary soil, municipal silt, engineering mud, engineering waste soil, tailings with a particle size of less than 2.36 mm, loam, clay, and silt. The clay base material has a moisture content of 7.3~25.6% and a maximum particle size of less than 4.75 mm. The cementing material is white silicate cement or magnesium cementing material; The water is either groundwater or surface water; The white silicate cement has a strength grade of 42.5; The magnesium-based cementitious material includes magnesium chloride oxychloride cementitious material and / or magnesium sulfur oxychloride cementitious material. The magnesium oxychloride cementitious material comprises the following raw materials in parts by weight: 21.3~27.4 parts of lightly calcined magnesium oxide and 18.1~23.3 parts of magnesium chloride hexahydrate; The magnesium sulfate-oxygen cementitious material comprises the following raw materials in parts by weight: 39.1~40.3 parts of lightly calcined magnesium oxide and 14.5~15.0 parts of magnesium sulfate heptahydrate; The filler comprises the following materials in parts by weight: 75-95 parts of fluidized solidified soil and 5-25 parts of clay-based recycled aggregate. The particle size distribution of the clay-based recycled aggregate is: 5-50 parts of 10mm particle size, 0-30 parts of 20mm particle size, and 0-20 parts of 30mm particle size.

2. The method for manufacturing a 3D printed additive structure using fluidized solidified soil for 3D printing as described in claim 1, characterized in that, The water-reducing agent is finally added to the raw material of the 3D printing fluidized solidified soil that has been mixed, or the water-reducing agent is added to water.

3. The method for manufacturing a 3D printed additive structure using fluidized solidified soil for 3D printing as described in claim 1, characterized in that, The 3D printed support structure is a semi-closed structure with an opening at the top. The reinforcing steel components are a reinforcing steel cage and a reinforcing steel connector. The reinforcing steel components are located inside the 3D printed support structure, and the filler material is located between the 3D printed support structure and the reinforcing steel components.

4. The method for manufacturing a 3D printed additive structure using fluidized solidified soil for 3D printing as described in claim 1, characterized in that, The printing inkjet material for the 3D printed support structure includes the following raw materials in parts by weight: 45-95 parts of 3D printing mortar and 5-55 parts of clay-based recycled aggregate. The 3D printing mortar comprises the following raw materials in parts by weight: 37.9-48.8 parts sand, 26.8-40.8 parts curing agent, 2.2-4.2 parts additives, 0.41-0.60 parts chopped fibers, and 15.8-23.8 parts water, wherein the sand particle size is less than 1.18 mm; The curing agent is a calcareous cementitious material and / or a magnesium cementitious material, wherein the calcareous cementitious material is one or more of ordinary silicate cement, white silicate cement, and alkali-activated cementitious material; The additive is one or more of rapid-hardening sulfoaluminate cement and rapid-hardening ferroaluminate cement. The chopped fibers are one or more of polyvinyl alcohol fibers, polyvinyl acrylonitrile fibers, polypropylene fibers, crack-resistant fibers, glass fibers, basalt fibers, carbon fibers, and steel fibers, and the length of the chopped fibers is 3-6 mm.

5. A method for manufacturing a 3D printed additive structure using fluidized solidified soil for 3D printing as described in claim 1, characterized in that, The clay-based recycled aggregate used in the filler has a 28-day compressive strength greater than 2.0 MPa, a crushing index less than 30%, and a 1-hour water absorption rate less than 20%.

6. A method for manufacturing a 3D printed additive structure using fluidized solidified soil for 3D printing, as described in claim 1, characterized in that, The fluidized solidified soil has a 3-day compressive strength greater than 0.8 MPa and a 28-day compressive strength greater than 2.3 MPa.

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