Fluidized solidified soil for 3D printing and method for manufacturing 3D printing additive structure filled with fluidized solidified soil for 3D printing

Abstract

Disclosed are a fluidized solidified soil for 3D printing and a method for manufacturing a 3D printing additive structure filled with a fluidized solidified soil for 3D printing. The fluidized solidified soil comprises the following raw materials in parts by weight: 16.7-56.9 parts of a clay-based material, 8.5-55.3 parts of a cementitious material, 0-0.9 parts of a water reducer, and 19.0-42.6 parts of water. First, a 3D printing additive structure is designed; then bottom and side surfaces of a supporting structure are printed, steel bar reinforcement components are placed, and a filling material is poured; and finally, a top surface of the supporting structure is printed. Since the present invention uses the clay-based material as the raw material, the costs of the filling material are reduced, the weight of the 3D printing additive structure is also significantly reduced, and the advantage of soil in enabling building structures to be warm in winter and cool in summer is effectively utilized, thereby reducing energy consumption during the normal use of buildings, and at the same time contributing to increasing the height of a 3D printed building structure.

Description

A 3D printing fluidized solidified soil and a manufacturing method of a 3D printing additive structure filled with the 3D printing fluidized solidified soil Technical Field

[0001] The present invention belongs to the field of architectural 3D printing, and in particular relates to a fluidized solidified soil for 3D printing and a method for manufacturing a 3D printing additive structure filled with the fluidized solidified soil for 3D printing. Background Art

[0002] The construction and municipal engineering sectors are pioneering the innovative engineering technology of premixed fluidized soil. While the current preparation of fluidized soil solves the technical challenges of utilizing local construction waste and forms a comprehensive technical framework encompassing "material development, complete equipment, process optimization, and construction organization," it primarily utilizes calcium-based cementitious materials like ordinary Portland cement as a curing agent and is primarily used in low-value-added projects like landfills.

[0003] 3D-printed additive structures are currently a trend in the future of building structures. Architectural structures using 3D printing typically first print the supporting structure, then place the reinforcement, and finally pour filler between the supporting structure and the reinforcement. However, this filler is currently typically cast on-site using cast-in-place concrete. However, when cast-in-place concrete is used for building envelopes, the strength requirements for these structures are lower than those for load-bearing structures. Using concrete intended for load-bearing structures for the building envelope results in wasted material value, increases building weight and costs, and hinders the ability to increase the height of 3D-printed buildings.

[0004] In addition, building envelope structures generally have high functional requirements for thermal insulation of building materials. The main raw materials of fluidized solidified soil are soil and water. After pouring, part of the water evaporates to form air cavities. The thermal insulation performance of soil, water and air cavities is excellent, which is very suitable for use in building envelope structures.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to address the problems of low added value of the current engineering application of fluidized solidified soil and relatively high construction costs of 3D printing, and to propose a method for manufacturing a 3D printing additive structure filled with fluidized solidified soil for 3D printing.

[0007] The present invention provides a fluidized solidified soil for 3D printing, wherein the fluidized solidified soil for 3D printing comprises the following raw materials in parts by weight: 16.7 to 56.9 parts of a clay base material, 8.5 to 55.3 parts of a cementitious material, 0 to 0.9 parts of a water reducing agent, and 19.0 to 42.6 parts of water;

[0008] The clay-based material includes one or more of: sedimentary soil from rivers, lakes and seas, municipal silt, engineering mud, engineering spoil, tailings with a particle size of less than 2.36 mm, sandy loam, loam, clay and silt;

[0009] The moisture content of the clay base material is 7.3-25.6%, and the maximum particle size of the clay base material is less than 4.75 mm;

[0010] The cementitious material is white silicate cement or magnesia cementitious material;

[0011] The water is groundwater or surface water.

[0012] Furthermore, the strength grade of the white Portland cement is 42.5.

[0013] Furthermore, the magnesium gelling material includes magnesium oxychloride gelling material and / or magnesium oxysulfide gelling material;

[0014] The magnesium oxychloride gelling material comprises the following raw materials in parts by weight: 21.3 to 27.4 parts of light-burned magnesium oxide and 18.1 to 23.3 parts of magnesium chloride hexahydrate;

[0015] The magnesium oxysulfate gelling material comprises the following raw materials in parts by weight: 39.1 to 40.3 parts of light-burned magnesium oxide and 14.5 to 15.0 parts of magnesium sulfate heptahydrate.

[0016] Furthermore, the water reducing agent is finally added to the mixed raw material of the fluidized solidified soil for 3D printing, or the water reducing agent is added to water.

[0017] Another object of the present invention is to provide a method for manufacturing a 3D printing additive structure filled with fluidized solidified soil for 3D printing, the manufacturing method comprising the following steps:

[0018] S1. First design the 3D printing additive structure, then use the 3D printing equipment to print the 3D printing support structure using 3D printing inkjet materials;

[0019] S2. When the 3D printed support structure reaches a certain height, place the steel bar components;

[0020] S3. After the 3D printed support structure has a certain strength, pouring a filler between the 3D printed support structure and the steel member, wherein the filler comprises fluidized solidified soil for 3D printing;

[0021] S4. After the filling material to be poured has a certain strength, continue to print the 3D printed support structure, place the steel components, and pour the filling material in sequence until the 3D printed structure reaches the designed elevation.

[0022] Furthermore, the 3D printed support structure is a semi-enclosed structure with an open upper end, the steel bar component is a steel cage and a steel bar connector, the steel bar component is located inside the 3D printed support structure, and the filler is located between the 3D printed support structure and the steel bar component.

[0023] Furthermore, the printing inkjet material of 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;

[0024] The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 to 48.8 parts of sand, 26.8 to 40.8 parts of curing agent, 2.2 to 4.2 parts of additives, 0.41 to 0.60 parts of chopped fibers, and 15.8 to 23.8 parts of water. The sand particle size is less than 1.18 mm.

[0025] The curing agent includes a calcium cementitious material and / or a magnesium cementitious material; the calcium cementitious material is one or more of ordinary Portland cement, white Portland cement, and alkali-activated cementitious material;

[0026] The additive is one or more of fast-hardening sulphoaluminate cement and fast-hardening ferroaluminate cement;

[0027] The chopped fibers are one or more of polyvinyl alcohol fibers, polyvinyl alcohol nitrile fibers, polypropylene fibers, crack-resistant fibers, glass fibers, basalt fibers, carbon fibers, and steel fibers. The length of the chopped fibers is 3 to 6 mm.

[0028] Furthermore, the filler includes 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 grading 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.

[0029] Furthermore, the clay-based recycled aggregate used as the filler has a 28d cylinder compressive strength greater than 2.0 MPa, a crushing index less than 30%, and a 1h water absorption rate less than 20%.

[0030] Furthermore, the 3d compressive strength of the fluidized solidified soil is greater than 0.8MPa, and the 28d compressive strength is greater than 2.3MPa.

[0031] The fluidized solidified soil for 3D printing of the present invention adopts clay-based raw materials produced from slurry waste with a high water content, and applies it to 3D printing, thereby reducing the cost of 3D printing engineering construction materials and increasing the added value of the engineering application of the fluidized solidified soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic diagram of a 3D printed beam unit structure filled with 3D fluidized solidified soil.

[0033] FIG2 is a schematic diagram of a 3D printed column unit structure filled with 3D fluidized solidified soil.

[0034] FIG3 is a schematic diagram of a 3D printed plate unit structure filled with 3D fluidized solidified soil.

[0035] FIG4 is a schematic diagram of a 3D printed wall unit structure filled with 3D fluidized solidified soil.

[0036] FIG5 is a schematic diagram of a method for manufacturing a 3D printing additive structure filled with fluidized solidified soil.

[0037] FIG6 is a schematic diagram of an extrusion molding device for producing clay-based magnesia recycled aggregate.

[0038] FIG7 is a schematic diagram of an aggregate vibrating screen of a clay-based magnesia recycled aggregate production equipment.

[0039] Figure: 1. Beam support structure; 2. Beam reinforcement; 3. Filling material; 4. Beam support structure bottom surface; 5. Beam support structure side surface; 6. Beam support structure top surface; 7. Column support structure; 8. Column reinforcement; 9. Column support structure bottom surface; 10. Column support structure side surface; 11. Column support structure top surface; 12. Slab support structure; 13. Slab reinforcement; 14. Slab support structure bottom surface; 15. Slab support structure side surface; 16. Slab support structure top surface; 17. Wall support structure Structure; 18. Wall reinforcement member; 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-roller roller; 28. Extrusion motor; 29. ​​Roller cleaning machine; 30. Hemispherical groove; 31. Screen bracket; 32. Aggregate screen; 33. Vibrating motor; 34. Flexible bracket; 35. Flexible cover. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0042] The fluidized solidified soil for 3D printing provided in this embodiment comprises the following raw materials in parts by weight: 16.7 to 56.9 parts of a clay base material, 8.5 to 55.3 parts of a cementitious material, 0 to 0.9 parts of a water reducing agent, and 19.0 to 42.6 parts of water.

[0043] The clay-based material includes one or more of: sedimentary soil from rivers, lakes and seas, municipal silt, engineering mud, engineering spoil, tailings with a particle size of less than 2.36 mm, sandy loam, loam, clay and silt;

[0044] The moisture content of the clay base material is 7.3-25.6%, and the maximum particle size of the clay base material is less than 4.75 mm;

[0045] The cementitious material is white silicate cement or magnesia cementitious material;

[0046] The water is groundwater or surface water.

[0047] 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 difficulties in efficient and high-value-added resource utilization of solid waste, but also fully reduces the cost of 3D printing construction.

[0048] Optionally, the strength grade of the white Portland cement is 42.5.

[0049] Optionally, the magnesium gelling material includes magnesium oxychloride gelling material and / or magnesium oxysulfide gelling material;

[0050] The magnesium oxychloride gelling material comprises the following raw materials in parts by weight: 21.3 to 27.4 parts of light-burned magnesium oxide and 18.1 to 23.3 parts of magnesium chloride hexahydrate;

[0051] The magnesium oxysulfate gelling material comprises the following raw materials in parts by weight: 39.1 to 40.3 parts of light-burned magnesium oxide and 14.5 to 15.0 parts of magnesium sulfate heptahydrate.

[0052] The embodiment of the present invention uses magnesium cementitious material as a curing agent for fluidized solidified soil. Not only does it have good chemical bonding with clay materials, but the fluidized solidified soil produced is also lighter in weight, which helps to increase the height of 3D printed additive structures. In addition, the printed buildings have the excellent performance of being warm in winter and cool in summer.

[0053] Optionally, the water reducing agent is finally added to the mixed raw material of the fluidized solidified soil for 3D printing, or the water reducing agent is directly added to water for use.

[0054] The present invention also provides a method for manufacturing a 3D printing additive structure filled with fluidized solidified soil for 3D printing, the manufacturing method comprising the following steps:

[0055] S1. First design the 3D printing additive structure, then use the 3D printing equipment to print the 3D printing support structure using 3D printing inkjet materials;

[0056] S2. When the 3D printed support structure reaches a certain height, place the steel bar components;

[0057] S3. After the 3D printed support structure has a certain strength, pour filling material between the 3D printed support structure and the steel member;

[0058] S4. After the filling material to be poured has a certain strength, continue to repeat the steps of printing the 3D printed support structure, placing the steel components, and pouring the filling material until the 3D printed structure reaches the designed elevation.

[0059] Optionally, the 3D printed support structure is a semi-enclosed structure with an open upper end, the steel bar component is a steel cage and steel bar connectors, the filler is fluidized solidified soil and clay-based recycled aggregate for 3D printing, the steel bar component is located inside the 3D printed support structure, and the filler is located between the 3D printed support structure and the steel bar component.

[0060] Optionally, the printing inkjet material of 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;

[0061] The 3D printing mortar comprises the following raw materials in parts by weight: 37.9 to 48.8 parts of sand, 26.8 to 40.8 parts of curing agent, 2.2 to 4.2 parts of additives, 0.41 to 0.60 parts of chopped fibers, and 15.8 to 23.8 parts of water. The sand particle size is less than 1.18 mm.

[0062] The curing agent includes a calcium cementitious material and / or a magnesium cementitious material, wherein the calcium cementitious material is one or more of ordinary Portland cement, white Portland cement, and alkali-activated cementitious material;

[0063] The additive is one or more of fast-hardening sulphoaluminate cement and fast-hardening ferroaluminate cement;

[0064] The chopped fibers are one or more of polyvinyl alcohol fibers, polyvinyl alcohol nitrile fibers, polypropylene fibers, crack-resistant fibers, glass fibers, basalt fibers, carbon fibers, and steel fibers. The length of the chopped fibers is 3 to 6 mm.

[0065] The embodiments of the present invention use different activators to fully activate the mineral powder to enhance the bonding performance of the cementitious material, while helping to reduce the cost of the curing agent in the 3D printing inkjet material, thereby further reducing the cost of the 3D printing inkjet material.

[0066] Optionally, the filler includes the following materials in parts by weight: 75-95 parts of fluidized solidified soil for 3D printing, 5-25 parts of clay-based recycled aggregate, and the particle grading 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.

[0067] Optionally, the clay-based recycled aggregate used as the filler has a 28d cylinder compressive strength greater than 2.0 MPa, a crushing index less than 30%, and a 1h water absorption rate less than 20%.

[0068] 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.

[0069] Optionally, clay-based recycled aggregate is prepared by extrusion molding. As shown in Figures 6 and 7, the extrusion molding equipment includes: a feed port 22, a double-roller extrusion device 23, an aggregate vibrating screen 24, a residual material conveyor belt 25, and an extrusion controller 26. The feed port 22 is located above the double-roller extrusion device 23, and the feed port 22 is connected to the mixing equipment via a mixing material conveyor belt. The double-roller extrusion device 23 is located above the aggregate vibrating screen 24, and the aggregate vibrating screen 24 is located above the residual material conveyor belt 25. The extrusion controller 26 is connected to the extrusion molding equipment. The mixing material is extruded into clay-based magnesium recycled aggregate through the extrusion molding equipment, realizing large-scale production of colloidal waste with a high moisture content without drying, providing production equipment support for sustainable development and waste-free city construction.

[0070] Optionally, the pair of rollers 23 includes: a pair of rollers 27, an extrusion motor 28, and a roller cleaning machine 29. The surface of each pair of rollers 27 is provided with a plurality of hemispherical grooves 30. The pair of rollers 27 is connected to the extrusion motor 28. The roller cleaning machine 29 is connected to the extrusion controller 26. The roller cleaning machine 29 is located above the pair of rollers 27. By providing the hemispherical grooves 30 on the surface of the pair of rollers 27, the mixture of colloidal waste with a high water content is extruded into an ellipsoidal clay-based magnesia recycled aggregate as shown in FIG1 , so that the clay-based magnesia recycled aggregate is tightly combined by physical action before molding, thereby reducing the porosity of the clay-based magnesia recycled aggregate and ensuring that the particle shape of the clay-based magnesia recycled aggregate is uniform and complete, effectively promoting the strength growth of the clay-based magnesia recycled aggregate.

[0071] Optionally, five extrusion forming devices are provided, including two with roller grooves having a diameter of 10 mm, two with roller grooves having a diameter of 20 mm, and one with roller grooves having a diameter of 30 mm. Extrusion forming devices with roller grooves having diameters of 30 mm, 20 mm, and 10 mm are provided in order from near to far from the mixing device. By providing extrusion forming devices with different particle sizes, the particle size requirements of clay-based magnesia recycled aggregate for different purposes can be met. At the same time, an extrusion forming device with a larger particle size is provided at the position closest to the mixing device, which facilitates the extrusion of the residual material conveyed by the residual material conveyor belt 25 into clay-based magnesia recycled aggregate with a larger particle size first, and then into clay-based magnesia recycled aggregate with a smaller particle size.

[0072] Example 1

[0073] As shown in Figure 1, 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, a beam reinforcement member 2 and a filler 3. The 3D printed beam support structure is a semi-closed structure with an open upper end. The bottom surface 4 of the 3D printed beam support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side 5 of the 3D printed beam support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 95 parts of 3D printing mortar and 5 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 2.2 parts of additives, 0.60 parts of chopped fibers, and 19.5 parts of water. The sand particle size is less than 1.18 mm, the curing agent is ordinary Portland cement, the additive is fast-hardening sulphoaluminate cement, the chopped fibers are crack-resistant fibers, and the chopped fibers are 3 mm in length. The filler comprises the following raw materials by weight: 75 parts of fluidized solidified soil for 3D printing and 25 parts of clay-based recycled aggregate. The fluidized solidified soil for 3D printing comprises the following raw materials by weight: 53.7 parts of a clay base with a moisture content of 7.3%, 13.4 parts of white Portland cement, 0.7 parts of a water reducer, and 32.2 parts of water. The water reducer is added separately to the mixed fluidized solidified soil for 3D printing. The flexural and compressive strengths of the fluidized solidified soil for 3D printing 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 base is sedimentary soil from rivers, lakes, and seas, with a maximum particle size of less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the beam unit, site conditions, and test results. The steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0074] As shown in Figure 2, a method for manufacturing a 3D printed additive structure filled with fluidized solidified soil using 3D printing is provided. The manufacturing method includes the following steps: first designing a 3D printed beam unit, and then printing a 3D printed beam support structure using a 3D printing device, first printing the bottom surface 4 of the beam with two layers of inkjet material, with steel bars placed between the two layers of inkjet material, and then printing the side surface 5 of the beam with one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3MP or more, placing a steel cage and fixing the position of the steel cage, and then pouring the filling material; when the compressive strength of the filling material reaches 3MP or more, spraying tap water on the top surface 6 of the beam to soak the top surface 6 of the beam, and then printing one layer of inkjet material on the top surface 6 of the beam.

[0075] Example 2

[0076] As shown in Figure 3, this embodiment uses a 3D-printed additive structure filled with fluidized solidified soil. The additive structure is a column unit, comprising a 3D-printed column support structure 7, a column reinforcement member 8, and a filler 3. The 3D-printed column support structure is a semi-enclosed structure with an open top. The bottom surface 9 and side surfaces 10 of the 3D-printed column support structure each comprise a layer of 3D-printed inkjet material. The 3D-printed inkjet material comprises the following raw materials by weight: 45 parts 3D-printed mortar and 55 parts clay-based recycled aggregate. The 3D-printed mortar comprises the following raw materials by weight: 48.8 parts sand, 26.8 parts curing agent, 4.2 parts additive, 0.60 parts chopped fiber, and 19.6 parts water. The sand has a particle size of less than 1.18 mm. The curing agent is white Portland cement, the additive is rapid-hardening ferroaluminate cement, and the chopped fiber is polyvinyl alcohol fiber, with a length of 3 mm. The filler includes the following raw materials in parts by weight: 75 parts of fluidized solidified soil for 3D printing and 25 parts of clay-based recycled aggregate; the fluidized solidified soil includes the following raw materials in parts by weight: 30.3 parts of a clay base material with a moisture content of 7.3%, 50.7 parts of a magnesia gelling material, 0 parts of a water reducer, and 19.0 parts of water; the magnesia gelling material includes the following raw materials in parts by weight: 27.4 parts of light-burned magnesium oxide and 23.3 parts of magnesium chloride hexahydrate. The flexural and compressive strengths of the fluidized solidified soil for 3D printing are shown in Table 1; the particle gradation of the clay-based recycled aggregate is: 20 parts of 10 mm particle size, 20 parts of 20 mm particle size, and 10 parts of 30 mm particle size; the clay base material is municipal sludge, and the maximum particle size of the clay base material is less than 4.75 mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted according to the design strength requirements of the column unit, the on-site environment and the test results, and the steel member is configured according to the column bearing capacity design requirements and the 3D printing technology requirements.

[0077] As shown in Figure 2, a method for manufacturing a 3D printed additive structure filled with fluidized solidified soil using 3D printing, the manufacturing method includes the following steps: first designing a 3D printed column unit, and then printing a 3D printed column support structure through a 3D printing device, first printing the column bottom surface 9, and then printing the beam side surface 10, both of which are 1 layer of inkjet material; after printing the column support structure, when the compressive strength of the column support structure reaches 3MP or more, place a steel cage and fix the position of the steel cage, and then pour the filling material; when the compressive strength of the filling material reaches 3MP or more, spray tap water on the column top surface 11 to soak the column top surface 11, and then print 1 layer of inkjet material on the column top surface 11.

[0078] Example 3

[0079] As shown in Figure 4, 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, a plate reinforcement member 13 and a filler 3. The 3D printed plate support structure is a semi-closed structure with an open upper end. The bottom surface 14 of the 3D printed plate support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side surface 15 of the 3D printed plate support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 45 parts of 3D printing mortar and 55 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 4.2 parts of additives, 0.41 parts of chopped fibers, and 15.8 parts of water. The sand particle size is less than 1.18 mm. The curing agent is an alkali-activated cementitious material, and the activator used for the alkali-activated cementitious material is a sulfate activator. The sulfate activator includes the following raw materials in parts by weight: 27 parts of quicklime powder, 67 parts of dihydrate gypsum, and 6 parts of sodium sulfate. The additive is fast-hardening sulphoaluminate cement. The chopped fibers are polyvinyl nitrile fibers, and the length of the chopped fibers is 4 mm. The filler comprises the following raw materials by weight: 95 parts of fluidized solidified soil for 3D printing and 5 parts of clay-based recycled aggregate. The fluidized solidified soil for 3D printing comprises the following raw materials by weight: 16.7 parts of a clay base with a moisture content of 7.3%, 53.6 parts of a magnesia cementitious material, 0 parts of a water reducer, and 29.7 parts of water. The magnesia cementitious material comprises the following raw materials by weight: 39.1 parts of light-burned magnesia and 14.5 parts of magnesium sulfate heptahydrate. The flexural and compressive strengths of the fluidized solidified soil for 3D printing are shown in Table 1. The particle size distribution of the clay-based recycled aggregate is 50 parts of a 10mm particle size. The clay base is engineering mud, with a maximum particle size of less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the slab unit, on-site conditions, and test results. The steel components are configured according to the slab bearing capacity design requirements and 3D printing technology requirements.

[0080] As shown in Figure 2, this embodiment uses a 3D printing additive structure manufacturing method filled with fluidized solidified soil. The manufacturing method includes the following steps: first design a 3D printing plate unit, and then print a 3D printing plate support structure through a 3D printing device, first print the bottom surface 14 of the plate, which is 2 layers of inkjet material, and place steel bars in the middle of the 2 layers of inkjet material, and then print the side surface 15 of the plate, which is 1 layer of inkjet material; after printing the plate support structure, when the compressive strength of the plate support structure reaches 3MP or more, place a steel cage and fix the position of the steel cage, and then pour the filling material; when the compressive strength of the filling material reaches 3MP or more, spray tap water on the top surface 16 of the plate to soak the top surface 16 of the plate, and then print 1 layer of inkjet material on the top surface 16 of the plate.

[0081] Example 4

[0082] As shown in FIG5 , 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, a wall reinforcement member 18, and a filler 3. The 3D printed wall support structure is a semi-enclosed structure with an open top. The bottom surface 19 and the side surface 20 of the 3D printed wall support structure are both a 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. The magnesium cementitious material includes magnesium oxychloride cementitious material, magnesium oxysulfide cementitious material, and phosphate cementitious material in a ratio of 5:3: 2 composition; the magnesium oxychloride gelling material includes the following raw materials in parts by weight: 54.1 parts of light-burned magnesium oxide and 45.9 parts of magnesium chloride hexahydrate; the magnesium oxysulfide gelling material includes the following raw materials in parts by weight: 60.1 parts of light-burned magnesium oxide and 39.9 parts of magnesium sulfate heptahydrate; the phosphate gelling material includes: 47.6 parts of dead-burned magnesium oxide, 34.3 parts of potassium dihydrogen phosphate, and 6.0 parts of borax; the additive is fast-hardening ferroaluminate cement, the chopped fibers are polypropylene fibers, and the length of the chopped fibers is 6 mm. The filler includes the following raw materials in parts by weight: 75 parts of fluidized solidified soil for 3D printing and 25 parts of clay-based recycled aggregate; the fluidized solidified soil for 3D printing includes the following raw materials in parts by weight: 34.9 parts of a clay base material with a moisture content of 7.3%, 39.4 parts of a magnesia gelling material, 0 parts of a water reducer, and 25.7 parts of water; the magnesia gelling material includes the following raw materials in parts by weight: 21.3 parts of light-burned magnesia and 18.1 parts of magnesium chloride hexahydrate. The flexural and compressive strengths of the fluidized solidified soil for 3D printing are shown in Table 1; the particle gradation of the clay-based recycled aggregate is: 30 parts of 10 mm particle size, 10 parts of 20 mm particle size, and 10 parts of 30 mm particle size; the clay base material is engineering waste soil, and the maximum particle size of the clay base material is less than 4.75 mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted according to the design strength requirements of the wall unit, the on-site environment and the test results, and the steel components are configured according to the wall bearing capacity design requirements and the 3D printing technology requirements.

[0083] As shown in FIG2 , this embodiment uses a 3D printing additive structure manufacturing method filled with fluidized solidified soil, and the manufacturing method includes the following steps: first designing a 3D printed wall unit, and then printing a 3D printed wall support structure through a 3D printing device, first printing the bottom surface 19 of the plate, and then printing the side surface 20 of the plate, both of which are 1 layer of inkjet material; after printing the wall support structure, when the compressive strength of the wall support structure reaches 3MP or more, placing steel components, and then pouring filling material; when the compressive strength of the filling material reaches 3MP or more, spraying tap water on the top surface 21 of the wall to soak the top surface 21 of the wall, and then printing 1 layer of inkjet material on the top surface 21 of the wall.

[0084] Example 5

[0085] As shown in Figure 4, 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, a plate reinforcement member 13 and a filler 3. The 3D printed plate support structure is a semi-closed structure with an open upper end. The bottom surface 14 of the 3D printed plate support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side surface 15 of the 3D printed plate support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 45 parts of 3D printing mortar and 55 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 4.2 parts of additives, 0.41 parts of chopped fibers, and 15.8 parts of water. The sand particle size is less than 1.18 mm. The curing agent is an alkali-activated cementitious material, and the activator used for the alkali-activated cementitious material is a sulfate activator. The sulfate activator includes the following raw materials in parts by weight: 27 parts of quicklime powder, 67 parts of dihydrate gypsum, and 6 parts of sodium sulfate. The additive is fast-hardening sulphoaluminate cement. The chopped fibers are polyvinyl nitrile fibers, and the length of the chopped fibers is 4 mm. The filler material comprises the following raw materials by weight: 95 parts of fluidized solidified soil for 3D printing and 5 parts of clay-based recycled aggregate. The fluidized solidified soil for 3D printing comprises the following raw materials by weight: 17.3 parts of a clay base with a moisture content of 7.3%, 55.3 parts of a magnesia cementitious material, 0 parts of a water reducer, and 27.5 parts of water. The magnesia cementitious material comprises the following raw materials by weight: 40.3 parts of light-burned magnesia and 15.0 parts of magnesium sulfate heptahydrate. The flexural and compressive strengths of the fluidized solidified soil for 3D printing are shown in Table 1. The particle size of the clay-based recycled aggregate is 50 parts of a 10mm particle size. The clay base is tailings with a particle size of less than 2.36mm, and the maximum particle size of the clay base is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the slab unit, the site environment, and test results. The steel components are configured according to the slab bearing capacity design requirements and 3D printing technology requirements.

[0086] As shown in Figure 2, this embodiment uses a 3D printing additive structure manufacturing method filled with fluidized solidified soil. The manufacturing method includes the following steps: first design a 3D printing plate unit, and then print a 3D printing plate support structure through a 3D printing device, first print the bottom surface 14 of the plate, which is 2 layers of inkjet material, and place steel bars in the middle of the 2 layers of inkjet material, and then print the side surface 15 of the plate, which is 1 layer of inkjet material; after printing the plate support structure, when the compressive strength of the plate support structure reaches 3MP or more, place a steel cage and fix the position of the steel cage, and then pour the filling material; when the compressive strength of the filling material reaches 3MP or more, spray tap water on the top surface 16 of the plate to soak the top surface 16 of the plate, and then print 1 layer of inkjet material on the top surface 16 of the plate.

[0087] Example 6

[0088] As shown in Figure 1, 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, a beam reinforcement member 2 and a filler 3. The 3D printed beam support structure is a semi-closed structure with an open upper end. The bottom surface 4 of the 3D printed beam support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side 5 of the 3D printed beam support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 95 parts of 3D printing mortar and 5 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 2.2 parts of additives, 0.60 parts of chopped fibers, and 19.5 parts of water. The sand particle size is less than 1.18 mm, the curing agent is ordinary Portland cement, the additive is fast-hardening sulphoaluminate cement, the chopped fibers are crack-resistant fibers, and the chopped fibers are 3 mm in length. The filler comprises the following raw materials by weight: 75 parts of fluidized solidified soil for 3D printing and 25 parts of clay-based recycled aggregate. The fluidized solidified soil for 3D printing comprises the following raw materials by weight: 49.1 parts of a clay base with a moisture content of 7.3%, 14.7 parts of white Portland cement, 0.8 parts of a water reducer, and 35.4 parts of water. The water reducer is added separately to the mixed fluidized solidified soil for 3D printing. The flexural and compressive strengths of the fluidized solidified soil for 3D printing 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 base is sedimentary soil from rivers, lakes, and seas, with a maximum particle size of less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the beam unit, site conditions, and test results. The steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0089] As shown in Figure 2, a method for manufacturing a 3D printed additive structure filled with fluidized solidified soil using 3D printing is provided. The manufacturing method includes the following steps: first designing a 3D printed beam unit, and then printing a 3D printed beam support structure using a 3D printing device, first printing the bottom surface 4 of the beam with two layers of inkjet material, with steel bars placed between the two layers of inkjet material, and then printing the side surface 5 of the beam with one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3MP or more, placing a steel cage and fixing the position of the steel cage, and then pouring the filling material; when the compressive strength of the filling material reaches 3MP or more, spraying tap water on the top surface 6 of the beam to soak the top surface 6 of the beam, and then printing one layer of inkjet material on the top surface 6 of the beam.

[0090] Example 7

[0091] As shown in Figure 1, 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, a beam reinforcement member 2 and a filler 3. The 3D printed beam support structure is a semi-closed structure with an open upper end. The bottom surface 4 of the 3D printed beam support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side 5 of the 3D printed beam support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 95 parts of 3D printing mortar and 5 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 2.2 parts of additives, 0.60 parts of chopped fibers, and 19.5 parts of water. The sand particle size is less than 1.18 mm, the curing agent is ordinary Portland cement, the additive is fast-hardening sulphoaluminate cement, the chopped fibers are crack-resistant fibers, and the chopped fibers are 3 mm in length. The filler material comprises the following raw materials by weight: 75 parts of fluidized solidified soil for 3D printing and 25 parts of clay-based recycled aggregate. The fluidized solidified soil for 3D printing comprises the following raw materials by weight: 52.6 parts of a clay base with a moisture content of 7.3%, 14.9 parts of white Portland cement, 0.9 parts of a water reducer, and 31.6 parts of water. The water reducer is added separately to the mixed fluidized solidified soil for 3D printing. The flexural and compressive strengths of the fluidized solidified soil for 3D printing 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 base is municipal sludge, with a maximum particle size of less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the beam unit, site conditions, and test results. The steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0092] As shown in Figure 2, a method for manufacturing a 3D printed additive structure filled with fluidized solidified soil using 3D printing is provided. The manufacturing method includes the following steps: first designing a 3D printed beam unit, and then printing a 3D printed beam support structure using a 3D printing device, first printing the bottom surface 4 of the beam with two layers of inkjet material, with steel bars placed between the two layers of inkjet material, and then printing the side surface 5 of the beam with one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3MP or more, placing a steel cage and fixing the position of the steel cage, and then pouring the filling material; when the compressive strength of the filling material reaches 3MP or more, spraying tap water on the top surface 6 of the beam to soak the top surface 6 of the beam, and then printing one layer of inkjet material on the top surface 6 of the beam.

[0093] Example 8

[0094] As shown in Figure 1, 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, a beam reinforcement member 2 and a filler 3. The 3D printed beam support structure is a semi-closed structure with an open upper end. The bottom surface 4 of the 3D printed beam support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side 5 of the 3D printed beam support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 95 parts of 3D printing mortar and 5 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 2.2 parts of additives, 0.60 parts of chopped fibers, and 19.5 parts of water. The sand particle size is less than 1.18 mm, the curing agent is ordinary Portland cement, the additive is fast-hardening sulphoaluminate cement, the chopped fibers are crack-resistant fibers, and the chopped fibers are 3 mm in length. The filler material comprises the following raw materials by weight: 75 parts of fluidized solidified soil for 3D printing and 25 parts of clay-based recycled aggregate. The fluidized solidified soil for 3D printing comprises the following raw materials by weight: 44.5 parts of a clay base with a moisture content of 25.6%, 13.4 parts of white Portland cement, 0.5 parts of a water reducer, and 41.6 parts of water. The water reducer is added separately to the mixed fluidized solidified soil for 3D printing. The flexural and compressive strengths of the fluidized solidified soil for 3D printing 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 base is sandy loam, with a maximum particle size of less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the beam unit, site conditions, and test results. The steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0095] As shown in Figure 2, a method for manufacturing a 3D printed additive structure filled with fluidized solidified soil using 3D printing is provided. The manufacturing method includes the following steps: first designing a 3D printed beam unit, and then printing a 3D printed beam support structure using a 3D printing device, first printing the bottom surface 4 of the beam with two layers of inkjet material, with steel bars placed between the two layers of inkjet material, and then printing the side surface 5 of the beam with one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3MP or more, placing a steel cage and fixing the position of the steel cage, and then pouring the filling material; when the compressive strength of the filling material reaches 3MP or more, spraying tap water on the top surface 6 of the beam to soak the top surface 6 of the beam, and then printing one layer of inkjet material on the top surface 6 of the beam.

[0096] Example 9

[0097] As shown in Figure 1, 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, a beam reinforcement member 2 and a filler 3. The 3D printed beam support structure is a semi-closed structure with an open upper end. The bottom surface 4 of the 3D printed beam support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side 5 of the 3D printed beam support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 95 parts of 3D printing mortar and 5 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 2.2 parts of additives, 0.60 parts of chopped fibers, and 19.5 parts of water. The sand particle size is less than 1.18 mm, the curing agent is ordinary Portland cement, the additive is fast-hardening sulphoaluminate cement, the chopped fibers are crack-resistant fibers, and the chopped fibers are 3 mm in length. The filler material comprises the following raw materials by weight: 75 parts of fluidized solidified soil for 3D printing and 25 parts of clay-based recycled aggregate. The fluidized solidified soil for 3D printing comprises the following raw materials by weight: 45.6 parts of a clay base with a moisture content of 25.6%, 11.4 parts of white Portland cement, 0.4 parts of a water reducer, and 42.6 parts of water. The water reducer is added separately to the mixed fluidized solidified soil for 3D printing. The flexural and compressive strengths of the fluidized solidified soil for 3D printing 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 base is loam, with a maximum particle size of less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the beam unit, site conditions, and test results. The steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0098] As shown in Figure 2, a method for manufacturing a 3D printed additive structure filled with fluidized solidified soil using 3D printing is provided. The manufacturing method includes the following steps: first designing a 3D printed beam unit, and then printing a 3D printed beam support structure using a 3D printing device, first printing the bottom surface 4 of the beam with two layers of inkjet material, with steel bars placed between the two layers of inkjet material, and then printing the side surface 5 of the beam with one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3MP or more, placing a steel cage and fixing the position of the steel cage, and then pouring the filling material; when the compressive strength of the filling material reaches 3MP or more, spraying tap water on the top surface 6 of the beam to soak the top surface 6 of the beam, and then printing one layer of inkjet material on the top surface 6 of the beam.

[0099] Example 10

[0100] As shown in Figure 1, 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, a beam reinforcement member 2 and a filler 3. The 3D printed beam support structure is a semi-closed structure with an open upper end. The bottom surface 4 of the 3D printed beam support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side 5 of the 3D printed beam support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 95 parts of 3D printing mortar and 5 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 2.2 parts of additives, 0.60 parts of chopped fibers, and 19.5 parts of water. The sand particle size is less than 1.18 mm, the curing agent is ordinary Portland cement, the additive is fast-hardening sulphoaluminate cement, the chopped fibers are crack-resistant fibers, and the chopped fibers are 3 mm in length. The filler comprises the following raw materials by weight: 75 parts of fluidized solidified soil for 3D printing and 25 parts of clay-based recycled aggregate. The fluidized solidified soil for 3D printing comprises the following raw materials by weight: 45.6 parts of a clay base with a moisture content of 14.3%, 11.4 parts of white Portland cement, 0.4 parts of a water reducer, and 42.6 parts of water. The water reducer is added separately to the mixed fluidized solidified soil for 3D printing. The flexural and compressive strengths of the fluidized solidified soil for 3D printing 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 base is clay, and the maximum particle size of the clay base is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the beam unit, the site environment, and test results. The steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0101] As shown in Figure 2, a method for manufacturing a 3D printed additive structure filled with fluidized solidified soil using 3D printing is provided. The manufacturing method includes the following steps: first designing a 3D printed beam unit, and then printing a 3D printed beam support structure using a 3D printing device, first printing the bottom surface 4 of the beam with two layers of inkjet material, with steel bars placed between the two layers of inkjet material, and then printing the side surface 5 of the beam with one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3MP or more, placing a steel cage and fixing the position of the steel cage, and then pouring the filling material; when the compressive strength of the filling material reaches 3MP or more, spraying tap water on the top surface 6 of the beam to soak the top surface 6 of the beam, and then printing one layer of inkjet material on the top surface 6 of the beam.

[0102] Example 11

[0103] As shown in Figure 1, 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, a beam reinforcement member 2 and a filler 3. The 3D printed beam support structure is a semi-closed structure with an open upper end. The bottom surface 4 of the 3D printed beam support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side 5 of the 3D printed beam support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 95 parts of 3D printing mortar and 5 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 2.2 parts of additives, 0.60 parts of chopped fibers, and 19.5 parts of water. The sand particle size is less than 1.18 mm, the curing agent is ordinary Portland cement, the additive is fast-hardening sulphoaluminate cement, the chopped fibers are crack-resistant fibers, and the chopped fibers are 3 mm in length. The filler material comprises the following raw materials by weight: 75 parts of fluidized clay for 3D printing and 25 parts of clay-based recycled aggregate. The fluidized clay for 3D printing comprises the following raw materials by weight: 44.5 parts of a clay base with a moisture content of 14.3%, 13.4 parts of white Portland cement, 0.5 parts of a water reducer, and 41.6 parts of water. The water reducer is added separately to the mixed fluidized clay for 3D printing. The flexural and compressive strengths of the fluidized clay for 3D printing 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 base is silt, with a maximum particle size of less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the beam unit, site conditions, and test results. The steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0104] As shown in Figure 2, a method for manufacturing a 3D printed additive structure filled with fluidized solidified soil using 3D printing is provided. The manufacturing method includes the following steps: first designing a 3D printed beam unit, and then printing a 3D printed beam support structure using a 3D printing device, first printing the bottom surface 4 of the beam with two layers of inkjet material, with steel bars placed between the two layers of inkjet material, and then printing the side surface 5 of the beam with one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3MP or more, placing a steel cage and fixing the position of the steel cage, and then pouring the filling material; when the compressive strength of the filling material reaches 3MP or more, spraying tap water on the top surface 6 of the beam to soak the top surface 6 of the beam, and then printing one layer of inkjet material on the top surface 6 of the beam.

[0105] Example 12

[0106] As shown in Figure 1, 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, a beam reinforcement member 2 and a filler 3. The 3D printed beam support structure is a semi-closed structure with an open upper end. The bottom surface 4 of the 3D printed beam support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side 5 of the 3D printed beam support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 95 parts of 3D printing mortar and 5 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 2.2 parts of additives, 0.60 parts of chopped fibers, and 19.5 parts of water. The sand particle size is less than 1.18 mm, the curing agent is ordinary Portland cement, the additive is fast-hardening sulphoaluminate cement, the chopped fibers are crack-resistant fibers, and the chopped fibers are 3 mm in length. The filler material comprises the following raw materials by weight: 75 parts of fluidized solidified soil for 3D printing and 25 parts of clay-based recycled aggregate. The fluidized solidified soil for 3D printing comprises the following raw materials by weight: 54.7 parts of a clay base with a moisture content of 7.3%, 11.9 parts of white Portland cement, 0.6 parts of a water reducer, and 32.8 parts of water. The water reducer is added separately to the mixed fluidized solidified soil for 3D printing. The flexural and compressive strengths of the fluidized solidified soil for 3D printing 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 base is construction waste, and the maximum particle size of the clay base is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the beam unit, the site environment, and test results. The steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0107] As shown in Figure 2, a method for manufacturing a 3D printed additive structure filled with fluidized solidified soil using 3D printing is provided. The manufacturing method includes the following steps: first designing a 3D printed beam unit, and then printing a 3D printed beam support structure using a 3D printing device, first printing the bottom surface 4 of the beam with two layers of inkjet material, with steel bars placed between the two layers of inkjet material, and then printing the side surface 5 of the beam with one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3MP or more, placing a steel cage and fixing the position of the steel cage, and then pouring the filling material; when the compressive strength of the filling material reaches 3MP or more, spraying tap water on the top surface 6 of the beam to soak the top surface 6 of the beam, and then printing one layer of inkjet material on the top surface 6 of the beam.

[0108] Example 13

[0109] As shown in Figure 1, 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, a beam reinforcement member 2 and a filler 3. The 3D printed beam support structure is a semi-closed structure with an open upper end. The bottom surface 4 of the 3D printed beam support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side 5 of the 3D printed beam support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 95 parts of 3D printing mortar and 5 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 2.2 parts of additives, 0.60 parts of chopped fibers, and 19.5 parts of water. The sand particle size is less than 1.18 mm, the curing agent is ordinary Portland cement, the additive is fast-hardening sulphoaluminate cement, the chopped fibers are crack-resistant fibers, and the chopped fibers are 3 mm in length. The filler comprises the following raw materials by weight: 75 parts of fluidized solidified soil for 3D printing and 25 parts of clay-based recycled aggregate. The fluidized solidified soil for 3D printing comprises the following raw materials by weight: 54.7 parts of a clay base with a moisture content of 7.3%, 11.9 parts of white Portland cement, 0.6 parts of a water reducer, and 32.8 parts of water. The water reducer is first added to 1 part of water and stirred before being added to the fluidized solidified soil for 3D printing. The flexural and compressive strengths of the fluidized solidified soil for 3D printing 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 base is construction waste, and the maximum particle size of the clay base is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the beam unit, the site environment, and test results. The steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0110] As shown in Figure 2, a method for manufacturing a 3D printed additive structure filled with fluidized solidified soil using 3D printing is provided. The manufacturing method includes the following steps: first designing a 3D printed beam unit, and then printing a 3D printed beam support structure using a 3D printing device, first printing the bottom surface 4 of the beam with two layers of inkjet material, with steel bars placed between the two layers of inkjet material, and then printing the side surface 5 of the beam with one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3MP or more, placing a steel cage and fixing the position of the steel cage, and then pouring the filling material; when the compressive strength of the filling material reaches 3MP or more, spraying tap water on the top surface 6 of the beam to soak the top surface 6 of the beam, and then printing one layer of inkjet material on the top surface 6 of the beam.

[0111] Example 14

[0112] As shown in Figure 1, 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, a beam reinforcement member 2 and a filler 3. The 3D printed beam support structure is a semi-closed structure with an open upper end. The bottom surface 4 of the 3D printed beam support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side 5 of the 3D printed beam support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 95 parts of 3D printing mortar and 5 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 2.2 parts of additives, 0.60 parts of chopped fibers, and 19.5 parts of water. The sand particle size is less than 1.18 mm, the curing agent is ordinary Portland cement, the additive is fast-hardening sulphoaluminate cement, the chopped fibers are crack-resistant fibers, and the chopped fibers are 3 mm in length. The filler comprises the following raw materials by weight: 75 parts of fluidized solidified soil for 3D printing and 25 parts of clay-based recycled aggregate. The fluidized solidified soil for 3D printing comprises the following raw materials by weight: 55.8 parts of a clay base with a moisture content of 7.3%, 10.2 parts of white Portland cement, 0.5 parts of a water reducer, and 33.5 parts of water. The water reducer is first added to 1 part of water and stirred before being added to the fluidized solidified soil for 3D printing. The flexural and compressive strengths of the fluidized solidified soil for 3D printing 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 base is construction waste, and the maximum particle size of the clay base is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the beam unit, the site environment, and test results. The steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0113] As shown in Figure 2, a method for manufacturing a 3D printed additive structure filled with fluidized solidified soil using 3D printing is provided. The manufacturing method includes the following steps: first designing a 3D printed beam unit, and then printing a 3D printed beam support structure using a 3D printing device, first printing the bottom surface 4 of the beam with two layers of inkjet material, with steel bars placed between the two layers of inkjet material, and then printing the side surface 5 of the beam with one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3MP or more, placing a steel cage and fixing the position of the steel cage, and then pouring the filling material; when the compressive strength of the filling material reaches 3MP or more, spraying tap water on the top surface 6 of the beam to soak the top surface 6 of the beam, and then printing one layer of inkjet material on the top surface 6 of the beam.

[0114] Example 15

[0115] As shown in Figure 1, 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, a beam reinforcement member 2 and a filler 3. The 3D printed beam support structure is a semi-closed structure with an open upper end. The bottom surface 4 of the 3D printed beam support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side 5 of the 3D printed beam support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 95 parts of 3D printing mortar and 5 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 2.2 parts of additives, 0.60 parts of chopped fibers, and 19.5 parts of water. The sand particle size is less than 1.18 mm, the curing agent is ordinary Portland cement, the additive is fast-hardening sulphoaluminate cement, the chopped fibers are crack-resistant fibers, and the chopped fibers are 3 mm in length. The filler comprises the following raw materials by weight: 75 parts of fluidized solidified soil for 3D printing and 25 parts of clay-based recycled aggregate. The fluidized solidified soil for 3D printing comprises the following raw materials by weight: 56.9 parts of a clay base with a moisture content of 7.3%, 8.5 parts of white Portland cement, 0.5 parts of a water reducer, and 34.1 parts of water. The water reducer is first added to 1 part of water and stirred before being added to the fluidized solidified soil for 3D printing. The flexural and compressive strengths of the fluidized solidified soil for 3D printing 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 base is construction waste soil, and the maximum particle size of the clay base is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the beam unit, the site environment, and test results. The steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0116] As shown in Figure 2, a method for manufacturing a 3D printed additive structure filled with fluidized solidified soil using 3D printing is provided. The manufacturing method includes the following steps: first designing a 3D printed beam unit, and then printing a 3D printed beam support structure using a 3D printing device, first printing the bottom surface 4 of the beam with two layers of inkjet material, with steel bars placed between the two layers of inkjet material, and then printing the side surface 5 of the beam with one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3MP or more, placing a steel cage and fixing the position of the steel cage, and then pouring the filling material; when the compressive strength of the filling material reaches 3MP or more, spraying tap water on the top surface 6 of the beam to soak the top surface 6 of the beam, and then printing one layer of inkjet material on the top surface 6 of the beam.

[0117] Example 16

[0118] As shown in Figure 1, 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, a beam reinforcement member 2 and a filler 3. The 3D printed beam support structure is a semi-closed structure with an open upper end. The bottom surface 4 of the 3D printed beam support structure is 2 layers of 3D printed inkjet material. A row of steel bars is evenly placed in the middle of the 2 layers of 3D printed inkjet material. The model and quantity of the placed steel bars are placed according to the ultimate bearing capacity of the beam and the 3D printing technology requirements; the side 5 of the 3D printed beam support structure is 1 layer of 3D printed inkjet material. The 3D printing inkjet material includes the following raw materials in parts by weight: 95 parts of 3D printing mortar and 5 parts of clay-based recycled aggregate. The 3D printing mortar includes the following raw materials in parts by weight: 37.9 parts of sand, 40.8 parts of curing agent, 2.2 parts of additives, 0.60 parts of chopped fibers, and 19.5 parts of water. The sand particle size is less than 1.18 mm, the curing agent is ordinary Portland cement, the additive is fast-hardening sulphoaluminate cement, the chopped fibers are crack-resistant fibers, and the chopped fibers are 3 mm in length. The filler comprises the following raw materials by weight: 75 parts of fluidized solidified soil for 3D printing and 25 parts of clay-based recycled aggregate. The fluidized solidified soil for 3D printing comprises the following raw materials by weight: 56.8 parts of a clay base with a moisture content of 7.3%, 8.5 parts of white Portland cement, 0.7 parts of a water reducer, and 34.1 parts of water. The water reducer is first added to 1 part of water and stirred before being added to the fluidized solidified soil for 3D printing. The flexural and compressive strengths of the fluidized solidified soil for 3D printing 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 base is construction waste, and the maximum particle size of the clay base is less than 4.75mm. The specific mix ratio of the 3D printing inkjet material and filler is adjusted based on the design strength requirements of the beam unit, the site environment, and test results. The steel components are configured according to the beam bearing capacity design requirements and 3D printing technology requirements.

[0119] As shown in Figure 2, a method for manufacturing a 3D printed additive structure filled with fluidized solidified soil using 3D printing is provided. The manufacturing method includes the following steps: first designing a 3D printed beam unit, and then printing a 3D printed beam support structure using a 3D printing device, first printing the bottom surface 4 of the beam with two layers of inkjet material, with steel bars placed between the two layers of inkjet material, and then printing the side surface 5 of the beam with one layer of inkjet material; after printing the beam support structure, when the compressive strength of the beam support structure reaches 3MP or more, placing a steel cage and fixing the position of the steel cage, and then pouring the filling material; when the compressive strength of the filling material reaches 3MP or more, spraying tap water on the top surface 6 of the beam to soak the top surface 6 of the beam, and then printing one layer of inkjet material on the top surface 6 of the beam.

[0120] The comparative results of Examples 1-16 are shown in Table 1.

[0121] Table 1 Flexural and compressive strength of fluidized solidified soil for 3D printing (MPa) Note: “ / ” in the table means that the item was not tested in that age period.

[0122] The present invention uses clay-based recycled aggregate produced from slurry waste with a high water content, which is cheap and easy to obtain. Applying it to 3D printing additive structures not only realizes low-cost large-scale production of coarse aggregate for 3D printing, but also effectively improves the resource utilization rate and added value of recycled aggregate, reduces the cost of 3D printing engineering construction materials, and at the same time increases the added value of fluidized solidified soil engineering applications; the magnesium cementitious material used as a curing agent for the fluidized solidified soil not only has good chemical bonding with the clay material, but also the fluidized solidified soil produced is lighter in weight, which helps to improve the height of the 3D printing additive structure.

[0123] By incorporating clay-based recycled aggregates and fluidized solidification soil for 3D printing into 3D-printed structures, not only can the cost and weight of 3D-printed buildings be significantly reduced, but the fluidized solidification soil used in 3D printing also fully leverages the architectural advantages of soil, significantly improving the thermal insulation of 3D-printed buildings and reducing energy consumption during normal use. Furthermore, the fluidized solidification soil used in 3D printing fully utilizes high-water-content solid waste in advanced construction technologies, achieving efficient, high-value-added engineering applications of high-water-content solid waste and fluidized solidification soil.

[0124] 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, ordinary technicians in the relevant field should understand that after reading the specification of this application, technicians can still modify or replace the specific implementation methods of the present invention with equivalents, but these modifications or changes do not depart from the scope of protection of the pending claims of the present application.

Claims

1. A fluidized solidified soil for 3D printing, characterized in that: The fluidized solidified soil for 3D printing comprises the following raw materials in parts by weight: 16.7 to 56.9 parts of clay base material, 8.5 to 55.3 parts of cementitious material, 0 to 0.9 parts of water reducing agent, and 19.0 to 42.6 parts of water; The clay-based material includes one or more of: sedimentary soil from rivers, lakes and seas, municipal silt, engineering mud, engineering spoil, tailings with a particle size of less than 2.36 mm, sandy loam, loam, clay and silt; The moisture content of the clay base material is 7.3-25.6%, and the maximum particle size of the clay base material is less than 4.75 mm; The cementitious material is white silicate cement or magnesia cementitious material; The water is groundwater or surface water.

2. The fluidized solidified soil for 3D printing according to claim 1, characterized in that: The strength grade of the white silicate cement is 42.

5.

3. The fluidized solidified soil for 3D printing according to claim 1, characterized in that: The magnesium gelling material includes magnesium oxychloride gelling material and / or magnesium oxysulfide gelling material; The magnesium oxychloride gelling material comprises the following raw materials in parts by weight: 21.3 to 27.4 parts of light-burned magnesium oxide and 18.1 to 23.3 parts of magnesium chloride hexahydrate; The magnesium oxysulfate gelling material comprises the following raw materials in parts by weight: 39.1 to 40.3 parts of light-burned magnesium oxide and 14.5 to 15.0 parts of magnesium sulfate heptahydrate.

4. The fluidized solidified soil for 3D printing according to claim 1, characterized in that: The water reducing agent is finally added to the mixed raw material of the fluidized solidified soil for 3D printing, or the water reducing agent is added to water.

5. A method for manufacturing a 3D printing additive structure using the fluidized solidified soil for 3D printing as claimed in any one of claims 1 to 4, characterized in that: The manufacturing method comprises the following steps: S1. First, design the 3D printing additive structure, and then use the 3D printing equipment to print the 3D printing support structure using 3D printing inkjet materials; S2. When the 3D printed support structure reaches a certain height, place the steel bar components; S3. After the 3D printed support structure has a certain strength, pouring a filler between the 3D printed support structure and the steel member, wherein the filler comprises fluidized solidified soil for 3D printing; S4. After the filling material to be poured has a certain strength, continue to print the 3D printed support structure, place the steel components, and pour the filling material in sequence until the 3D printed structure reaches the designed elevation.

6. The method for manufacturing a 3D printing additive structure using fluidized solidified soil for 3D printing according to claim 5, characterized in that: The 3D printed support structure is a semi-enclosed structure with an open upper end. The steel bar component is a steel cage and a steel bar connector. The steel bar component is located inside the 3D printed support structure, and the filler is located between the 3D printed support structure and the steel bar component.

7. The method for manufacturing a 3D printing additive structure using fluidized solidified soil for 3D printing according to claim 5, characterized in that: The printing inkjet material of the 3D printing 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 to 48.8 parts of sand, 26.8 to 40.8 parts of curing agent, 2.2 to 4.2 parts of additives, 0.41 to 0.60 parts of chopped fibers, and 15.8 to 23.8 parts of water. The sand particle size is less than 1.18 mm. The curing agent is a calcium cementitious material and / or a magnesium cementitious material, and the calcium cementitious material is one or more of ordinary Portland cement, white Portland cement, and alkali-activated cementitious material; The additive is one or more of fast-hardening sulphoaluminate cement and fast-hardening ferroaluminate cement; The chopped fibers are one or more of polyvinyl alcohol fibers, polyvinyl alcohol nitrile fibers, polypropylene fibers, crack-resistant fibers, glass fibers, basalt fibers, carbon fibers, and steel fibers. The length of the chopped fibers is 3 to 6 mm.

8. The method for manufacturing a 3D printing additive structure using fluidized solidified soil for 3D printing according to claim 5, characterized in that: The filler includes 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 gradation 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.

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

10. The method for manufacturing a 3D printing additive structure using fluidized solidified soil for 3D printing according to claim 5, characterized in that: The fluidized solidified soil has a 3d compressive strength greater than 0.8 MPa, and a 28d compressive strength greater than 2.3 MPa.

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