3D-printed high-performance geopolymer concrete and method for producing same
By using industrial solid wastes such as fly ash and slag, along with composite retarder and polyvinyl alcohol fiber, the environmental protection and setting speed issues of 3D printed concrete have been solved, achieving high-strength and low-cost 3D printing results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANXI CONSTR ENG GROUP CORP
- Filing Date
- 2026-05-22
- Publication Date
- 2026-06-19
AI Technical Summary
Existing 3D printed concrete suffers from poor environmental performance, rapid setting of geopolymer concrete leading to poor extrusion and constructability, and high cost of steel fiber reinforced materials.
Using industrial solid wastes such as fly ash and slag as raw materials, combined with barium chloride and borax as composite retarder, it replaces traditional silicate cement, and adds polyvinyl alcohol fiber as a reinforcing material to regulate setting time and material properties.
It achieves low-carbon emissions and high-strength 3D printing performance, avoids material blockage and poor interlayer bonding, reduces costs, and improves the toughness and crack resistance of materials.
Smart Images
Figure CN122233705A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the fields of 3D printing of buildings and resource utilization of solid waste, specifically a 3D printed high-performance geopolymer concrete and its preparation method. Background Technology
[0002] 3D-printed concrete technology, through a digital moldless forming process, enables the free construction of complex and irregular structures, offering significant advantages in improving resource efficiency, reducing energy consumption, and promoting intelligent construction. As an additive manufacturing method integrating 3D printing technology with concrete materials, 3D-printed concrete is characterized by digitalization, automation, and intelligence. It involves computer modeling and algorithmic optimization, followed by layer-by-layer deposition and bonding according to a preset program. However, traditional 3D-printed concrete uses silicate cement as a binder, resulting in high energy consumption and carbon emissions, which contradicts the development concept of green construction. Furthermore, key indicators such as strength and setting time are difficult to meet the requirements of 3D printing technology.
[0003] Geopolymer concrete, made from industrial solid waste such as fly ash and slag through alkaline solution activation, possesses both early strength and rapid hardening characteristics, making it an ideal material for the high-value utilization of industrial solid waste. However, geopolymer concrete suffers from excessively rapid setting, which can easily lead to nozzle clogging or poor interlayer bonding during 3D printing, hindering the achievement of good extrusion properties and buildability. Furthermore, to improve the toughness and crack resistance of concrete, fiber reinforcement materials are typically added; however, the steel fibers commonly used in traditional high-performance concrete are expensive, hindering their widespread application.
[0004] Therefore, it is necessary to invent a 3D-printed high-performance geopolymer concrete and its preparation method to solve the above problems. Summary of the Invention
[0005] To address the problems of poor environmental performance, rapid setting leading to poor extrudability and constructability of existing 3D printed concrete, and high cost of steel fiber reinforced materials, this invention provides a 3D printed high-performance geopolymer concrete and its preparation method.
[0006] This invention is achieved using the following technical solution: A 3D-printed high-performance geopolymer concrete comprises, by weight, the following components: 940-960 parts fly ash, 3810-3830 parts slag, 4760-4780 parts quartz sand, 240-260 parts silica fume, 700-720 parts water glass, 470-490 parts sodium silicate pentahydrate, 240-260 parts borax, 20-40 parts barium chloride, 27-83 parts polyvinyl alcohol fiber, and 1507 parts water.
[0007] Furthermore, the polyvinyl alcohol fiber has a length of 6 mm, a diameter of 15~25 μm, and a tensile strength of 800~1400 MPa.
[0008] Furthermore, the fly ash has a particle size of 5~45 μm; the slag has a particle size of 2.6~46 μm, and its 28-day activity index is ≥105%.
[0009] Furthermore, the quartz sand has a particle size of 180~425 μm, a Mohs hardness of 7.0, and a density of 2.65 g / cm³. 3 .
[0010] Furthermore, the particle size of the silica fume is 0.14~107 μm.
[0011] Furthermore, the water glass has a modulus of 3.0 and a density of 1.48 g / cm³. 3 .
[0012] Furthermore, the sodium silicate pentahydrate is industrial-grade sodium silicate pentahydrate, with a mass ratio of silicon dioxide to sodium oxide ≥0.98.
[0013] Furthermore, the barium chloride is barium chloride dihydrate with a mass fraction ≥99.5% and a particle size of 20~150 μm, and water-insoluble matter ≤0.01%; the borax is sodium tetraborate decahydrate with a mass fraction ≥99.5% and a particle size of 20~150 μm.
[0014] A method for preparing 3D-printed high-performance geopolymer concrete, the method comprising the following steps: S1: Mix fly ash, slag, quartz sand, and silica fume to obtain a mixture; mix water glass, sodium silicate pentahydrate, borax, barium chloride, and water to obtain a mixed solution; S2: Mix the mixture with the mixed solution to obtain a mixture; S3: Mix polyvinyl alcohol fibers with the mixture to obtain the 3D printed high-performance geopolymer concrete.
[0015] A method for using 3D-printed high-performance geopolymer concrete includes: The 3D-printed high-performance geopolymer concrete was then 3D printed. The parameters for 3D printing include: nozzle diameter 10~40 mm, extrusion speed 40~80 rpm, and horizontal printing speed 20~50 mm / s.
[0016] This invention provides a 3D-printed high-performance geopolymer concrete and its preparation method, which has the following advantages compared with the prior art: 1. This invention uses industrial solid waste such as fly ash and slag as the main raw materials to replace traditional silicate cement, which greatly reduces carbon emissions and energy consumption, conforms to the concept of green building, and realizes the high-value resource utilization of solid waste.
[0017] 2. By introducing barium chloride and borax as composite retarder, this invention effectively solves the problem of excessively fast setting speed of geopolymer concrete, avoids material clogging of nozzles or poor interlayer bonding during 3D printing, and achieves good extrusion performance and constructability.
[0018] 3. This invention uses polyvinyl alcohol fiber instead of traditional steel fiber as a reinforcing material, which not only significantly reduces material costs, but also makes the fiber biodegradable and more environmentally friendly; at the same time, by controlling the fiber content, the printing difficulties caused by fiber agglomeration are avoided, ensuring the smooth progress of 3D printing.
[0019] 4. The synergistic effect of the components of this invention enables the prepared 3D printed high-performance geopolymer concrete to achieve a compressive strength of up to 158.3 MPa, combining high strength with excellent 3D printing performance, providing a new technical path for the green and intelligent transformation of the construction industry. Attached Figure Description
[0020] Figure 1 This is a physical image of the high-performance geopolymer concrete 3D printed product prepared in Example 1 of the present invention.
[0021] Figure 2 This is a physical image of the high-performance geopolymer concrete 3D printed product prepared in Example 4 of the present invention. Detailed Implementation
[0022] A method for preparing 3D-printed high-performance geopolymer concrete includes the following steps: S1: Weigh out 940-960 parts of fly ash, 3810-3830 parts of slag, 4760-4780 parts of quartz sand, 240-260 parts of silica fume, 700-720 parts of water glass, 470-490 parts of sodium silicate pentahydrate, 240-260 parts of borax, 20-40 parts of barium chloride, and 1507 parts of water by weight; mix the above-mentioned parts of fly ash, slag, quartz sand, and silica fume evenly by stirring to obtain a mixture; mix the above-mentioned parts of water glass, sodium silicate pentahydrate, borax, barium chloride, and water evenly by stirring to obtain a mixed solution.
[0023] S2: Add the mixed solution to the mixture at a constant speed and continue stirring to obtain the mixture.
[0024] S3: Weigh 27-83 parts of polyvinyl alcohol fiber by weight and add it to the mixture. Stir continuously to ensure thorough mixing. When adding the fiber, be careful to disperse it to avoid clumping and causing printhead blockage during subsequent printing. Finally, the 3D printed high-performance geopolymer concrete is obtained.
[0025] In the above preparation process, the fly ash is Grade I fly ash with a particle size of 5~45 μm. This invention uses fly ash as a precursor primarily to provide a silicon source and improve the rheology and interfacial structure of the slurry, thereby enabling concrete to have higher strength and durability.
[0026] The slag has a particle size of 2.6~46 μm and a 28-day activity index ≥105%. The slag used in this invention has high reactivity. Furthermore, since the slag is a high-calcium aluminosilicate material, it dissolves rapidly under alkaline conditions to generate CASH gel. This CASH gel, together with the NASH gel provided by fly ash, forms a composite gel system, significantly improving the early strength of concrete, accelerating setting, and improving porosity, thereby enhancing mechanical properties.
[0027] The quartz sand has a particle size of 180~425 μm, a Mohs hardness of 7.0, and a density of 2.65 g / cm³. 3 This invention controls the amount of quartz sand within the aforementioned range, which is beneficial for obtaining high-strength concrete. Excessive quartz sand usage will lead to severe water deficiency in the geopolymer precursor, reducing fluidity, affecting printing results, and even preventing printing altogether. Insufficient quartz sand usage will fail to guarantee the density and high strength of the matrix.
[0028] The silica fume has a particle size of 0.14~107 μm. The silica fume in this invention can fill the gaps between fly ash and slag particles, improve the adhesion of the printing matrix, and thus enhance the interlayer bonding and constructability of printed high-performance geopolymer concrete.
[0029] The water glass has a modulus of 3.0 and a density of 1.48 g / cm³. 3 Water glass acts as an alkaline activator, providing hydroxide ions and soluble silicon monomers to catalyze the dissolution and condensation of aluminosilicate precursors (fly ash and slag) into a geopolymer gel framework.
[0030] The sodium silicate pentahydrate is industrial-grade sodium silicate pentahydrate, with a silicon dioxide to sodium oxide mass ratio ≥0.98. As a solid sodium silicate source, the sodium silicate pentahydrate, after dissolution, provides a high concentration of active silicon-oxygen anions and sodium ions, adjusts the solution pH, and promotes the dissolution of the aluminosilicate precursor and the condensation of the geopolymer gel network.
[0031] The barium chloride is barium chloride dihydrate with a mass fraction ≥99.5% and a particle size of 20~150 μm, with water-insoluble matter ≤0.01%; the borax is sodium tetraborate decahydrate with a mass fraction ≥99.5% and a particle size of 20~150 μm.
[0032] Both barium chloride and borax are used as retarder in the preparation of high-performance geopolymer concrete. The barium ions in the barium chloride react with hydroxide ions in the alkaline activator to form slightly soluble barium hydroxide, which forms a passivating film on the surface of fly ash / slag particles, slowing down the erosion and dissolution rate of the aluminosilicate glass by hydroxide ions. The tetrahydroxyborax ions formed by borax dissolved in a strongly alkaline environment can coordinate with aluminum dissolved from the precursor to form stable BO-Al bonds, thereby competitively inhibiting the Al-O-Si condensation reaction between aluminum-silicon oligomers, achieving a retarding effect.
[0033] The polyvinyl alcohol (PVA) fibers have a length of 6 mm, a diameter of 15–25 μm, and a tensile strength of 800–1400 MPa. The length of the PVA fibers should not be too short, as this would result in insufficient bridging of cracks and negatively impact the strength and toughness of the high-performance geopolymer concrete. The PVA fibers in this invention can improve the toughness, tensile strength, flexural strength, shear strength, and fatigue resistance of concrete.
[0034] This invention maximizes the retarding efficiency of the retarder by efficiently stirring the mixture and the solution in an orderly manner. Subsequently, polyvinyl alcohol fibers are gradually added while continuing stirring, ensuring uniform mixing of all raw materials during the step-by-step addition process, thereby imparting excellent material properties.
[0035] In summary, the superior performance of the 3D-printed high-performance geopolymer concrete of this invention is based on the synergistic effect of the following three core mechanisms: (1) Alkali activation reaction: Water glass and sodium silicate pentahydrate are used as alkali activators to provide OH- - Ions and soluble silicon monomers. OH - It disrupts the stable structure of Si-O-Si and Al-O-Al networks in slag and fly ash, dissolving active silicon-aluminum monomers, which then react in OH... - Under catalysis, a condensation reaction occurs to generate a three-dimensional network aluminosilicate gel (NASH / CASH), enabling slow coagulation of low-calcium systems (fly ash) and rapid hardening of high-calcium systems (slag).
[0036] (2) Setting time control: To address the problem of excessively rapid setting caused by the high calcium content of slag, barium chloride and borax act as a composite retarder, playing a synergistic role. Barium chloride contains Ba... 2＋ SO4 leached from slag 2-The formation of sparingly soluble BaSO4 precipitate forms a physical barrier on the particle surface, delaying the nucleation and ion diffusion of hydration products. Simultaneously, the tetrahydroxyborax ions formed after borax dissolves in a strongly alkaline environment coordinate with aluminum dissolved from the precursor to form stable BO-Al bonds, competitively inhibiting the Al-O-Si condensation reaction between aluminum-silicon oligomers. Both factors work together to regulate the setting time, providing an ideal operating window for 3D printing.
[0037] (3) Fiber-reinforced toughening: Polyvinyl alcohol fibers are uniformly dispersed before the initial setting of concrete to form a three-dimensional random network. When the matrix shrinks or is subjected to load and microcracks are generated, the fibers transfer stress across the crack interface, inhibit crack propagation, and transform the multi-crack cracking mode into a finely distributed steady-state crack through the bridging effect, which significantly improves the toughness, crack resistance and ductile failure characteristics of the material.
[0038] The three mechanisms mentioned above work together to achieve the technical goals of controllable setting time, reasonable strength development, and enhanced volume stability of geopolymer concrete, giving it both excellent 3D printing performance and high compressive strength.
[0039] The 3D-printed high-performance geopolymer concrete obtained by the preparation process described in this invention has one method of use, which includes the following steps: 3D printing the 3D-printed high-performance geopolymer concrete; the parameters of the 3D printing include: nozzle diameter 10~40 mm, extrusion speed 40~80 rpm, and horizontal printing speed 20~50 mm / s.
[0040] It should be noted that the present invention does not have any special limitations on the 3D printing equipment; any existing 3D printing equipment known to those skilled in the art can be used.
[0041] The printing parameters of the method provided by this invention can be matched with the 3D printed high-performance geopolymer concrete prepared by this invention, thereby realizing the 3D printing of high-performance geopolymer concrete.
[0042] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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 are within the scope of protection of the present invention. Unless otherwise specified, the raw materials in the embodiments of the present invention are all purchased through commercial channels. Example 1
[0043] A method for preparing 3D-printed high-performance geopolymer concrete includes the following steps: S1: By weight, weigh out 954 parts fly ash, 3817 parts slag, 4772 parts quartz sand, 251 parts silica fume, 708 parts water glass, 477 parts sodium silicate pentahydrate, 251 parts borax, 32 parts barium chloride, and 1507 parts water; the fly ash is Grade I fly ash with a particle size of 5~45 μm. The slag has a particle size of 2.6~46 μm and a 28-day activity index ≥105%. The quartz sand has a particle size of 235~370 μm, a Mohs hardness of 7.0, and a density of 2.65 g / cm³. 3 The silica fume has a particle size of 0.23~5.6 μm. The water glass has a modulus of 3.0 and a density of 1.48 g / cm³. 3 The sodium silicate pentahydrate is industrial-grade sodium silicate pentahydrate, with a modulus of 0.98 based on the mass ratio of silicon dioxide to sodium oxide. The barium chloride is barium chloride dihydrate with a mass fraction ≥99.5%, a particle size of 20~150 μm, and water-insoluble matter ≤0.01%; the borax is sodium tetraborate decahydrate with a mass fraction ≥99.5%, and a particle size of 20~150 μm.
[0044] The above-mentioned amounts of fly ash, slag, quartz sand, and silica fume are stirred evenly in a mixing pot for 180 seconds to obtain a mixture. The above-mentioned amounts of water glass, sodium silicate pentahydrate, borax, barium chloride, and water are then stirred and mixed evenly to obtain a mixed solution.
[0045] S2: Add the mixed solution to the mixture in 3 to 4 portions, adding it at a uniform rate within 5 seconds each time, and continue stirring for 2 minutes to obtain the mixture.
[0046] S3: Weigh 27 parts by weight of polyvinyl alcohol fiber and add it to the mixture at a uniform speed within 2 minutes. Stir continuously for 5 minutes to ensure thorough mixing. The polyvinyl alcohol fiber has a length of 6 mm, a diameter of 25 μm, and a tensile strength of 1200 MPa. Finally, the 3D printed high-performance geopolymer concrete is obtained. Example 2
[0047] The difference between this embodiment and embodiment 1 is that in step S1, the weight of the fly ash is 940 parts, the slag is 3810 parts, the quartz sand is 4760 parts, the silica fume is 240 parts, the water glass is 700 parts, the sodium silicate pentahydrate is 470 parts, the borax is 240 parts, the barium chloride is 20 parts, and the water is 1507 parts; the remaining preparation steps and process parameters are the same as in embodiment 1, and the 3D printed high-performance geopolymer concrete is prepared. Example 3
[0048] The difference between this embodiment and embodiment 1 is that in step S1, the weight of fly ash is 960 parts, slag is 3830 parts, quartz sand is 4780 parts, silica fume is 260 parts, water glass is 720 parts, sodium silicate pentahydrate is 490 parts, borax is 260 parts, barium chloride is 40 parts, and water is 1507 parts; the remaining preparation steps and process parameters are the same as in embodiment 1, and the 3D printed high-performance geopolymer concrete is prepared. Example 4
[0049] The difference between this embodiment and embodiment 1 is that in step S3, the weight of the polyvinyl alcohol fiber is 55 parts; the remaining preparation steps and process parameters are the same as in embodiment 1, and the 3D printed high-performance geopolymer concrete is prepared. Example 5
[0050] The difference between this embodiment and embodiment 1 is that in step S3, the weight of the polyvinyl alcohol fiber is 83 parts; the remaining preparation steps and process parameters are the same as in embodiment 1, and the 3D printed high-performance geopolymer concrete is prepared. Comparative Example 1
[0051] The difference between this comparative example and Example 1 is that barium chloride is not added in step S1, while the remaining preparation steps and process parameters are the same as in Example 1, resulting in the preparation of a 3D printed concrete. Comparative Example 2
[0052] The difference between this comparative example and Example 1 is that in step S1, the weight of the barium chloride is 64 parts, and the remaining preparation steps and process parameters are the same as in Example 1, thus preparing a 3D printed concrete. Comparative Example 3
[0053] The difference between this comparative example and Example 1 is that in step S1, the weight of the barium chloride is 96 parts, and the remaining preparation steps and process parameters are the same as in Example 1, thus preparing a 3D printed concrete. Comparative Example 4
[0054] The difference between this comparative example and Example 1 is that in step S3, the polyvinyl alcohol fiber is replaced with the same number of parts by weight of polyethylene fiber, while the remaining preparation steps and process parameters are the same as in Example 1, and a 3D printed concrete is prepared. Comparative Example 5
[0055] The difference between this comparative example and Example 4 is that in step S3, the polyvinyl alcohol fiber is replaced with the same number of parts by weight of polyethylene fiber, while the remaining preparation steps and process parameters are the same as in Example 4, and a 3D printed concrete is prepared. Comparative Example 6
[0056] The difference between this comparative example and Example 5 is that in step S3, the polyvinyl alcohol fiber is replaced with the same number of parts by weight of polyethylene fiber, while the remaining preparation steps and process parameters are the same as in Example 5, and a 3D printed concrete is prepared. Comparative Example 7
[0057] The difference between this comparative example and Example 1 is that in step S1, the weight of the quartz sand is 2481 parts and the weight of the barium chloride is 20 parts. The remaining preparation steps and process parameters are the same as in Example 1, and a 3D printed concrete is prepared.
[0058] The 3D-printed high-performance geopolymer concrete prepared in Examples 1-5 and the concrete prepared in Comparative Examples 1-7 were 3D printed. The printing nozzle diameter was set to 30 mm, the extrusion speed to 60 rpm, and the horizontal printing speed to 20 mm / s. Then, printing was performed to obtain the 3D printed concrete product.
[0059] The following performance tests were performed on the high-performance geopolymer concrete prepared in Examples 1-5 and the concrete prepared in Comparative Examples 1-7 in sequence: (1) Compressive strength test: The 3D printed concrete specimens were cured in situ for 1 day and then cured in high temperature water for 3 days. The specimens were then cut to obtain compressive strength test specimens. The compressive strength was determined by force loading at a loading rate of 500 N / s, referring to GB / T 50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete".
[0060] (2) Flowability test: Take freshly mixed concrete and measure its flowability by referring to the jumping table method specified in GB / T 2419-2005 "Method for Determination of Flowability of Cement Mortar".
[0061] (3) Extrudability evaluation: During the 3D printing process, observe the smoothness of printing and the uniformity of the printed strip. If the printing process is continuous and smooth, and the cross-section of the extruded strip is uniform, it is judged as good extrudability; if there is clogging, broken strips or uneven strips, it is judged as poor.
[0062] (4) Constructability evaluation: During or after 3D printing, observe the stacking height and number of layers of the printed strips to judge the quality of constructability; generally, if the number of printed layers is greater than five, the stacking height is greater than 150 mm and no collapse occurs, it is considered to have good constructability.
[0063] It should be noted that when the extrudability or constructability of concrete is poor, effective printed specimens cannot be obtained, and therefore the compressive strength cannot be measured.
[0064] In all performance tests, the same test conditions were used for each embodiment and comparative example. The test results of embodiments 1-5 and comparative examples 1-7 are shown in Table 1.
[0065] Table 1
[0066] As shown in Table 1, the 3D-printed high-performance geopolymer concrete prepared using the raw material proportions and methods provided in this invention exhibits excellent extrudability, constructability, and compressive strength. Among them, the high-performance geopolymer concrete prepared using the proportions of Examples 1, 4, and 5 of this invention shows particularly significant performance. After in-situ curing for 1 day, high-temperature water curing for 3 days, and cutting, the compressive strength of its specimens all exceeded 100 MPa, with the highest reaching 158.3 MPa.
[0067] Figures 1-2 The images show actual photos of the 3D-printed high-performance geopolymer concrete products prepared in Examples 1 and 4, respectively. As can be seen from the images, the high-performance geopolymer concrete prepared by the method of this invention produces continuous and uniform strips during 3D printing. The stacking height and number of layers meet good criteria without collapsing, demonstrating good constructability and excellent overall printing effect.
[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A 3D printed high-performance geopolymer concrete, characterized in that, By weight parts, including the following components: fly ash 940-960 parts, slag 3810-3830 parts, quartz sand 4760-4780 parts, silica ash 240-260 parts, water glass 700-720 parts, sodium silicate pentahydrate 470-490 parts, borax 240-260 parts, barium chloride 20-40 parts, polyvinyl alcohol fiber 27-83 parts, water 1507 parts.
2. A 3D printed high-performance geopolymer concrete according to claim 1, characterized in that: The length of the polyvinyl alcohol fiber is 6 mm, the diameter is 15-25 μm, and the tensile strength is 800-1400 MPa.
3. A 3D printed high-performance geopolymer concrete according to claim 1, characterized in that: The particle size of the fly ash is 5-45 μm; the particle size of the slag is 2.6-46 μm, and the 28-day activity index is ≥105%.
4. The 3D printed high-performance geopolymer concrete according to claim 1, characterized in that: The quartz sand has a particle size of 180 to 425 μm, a Mohs hardness of 7.0, and a density of 2.65 g / cm 3 .
5. The 3D printed high-performance geopolymer concrete as claimed in claim 1, wherein: The particle size of the silica ash is 0.14-107 μm.
6. The 3D printed high-performance geopolymer concrete according to claim 1, characterized in that: The modulus of said water glass is 3.0 and the density is 1.48 g / cm 3 .
7. The 3D printed high-performance geopolymer concrete according to claim 1, wherein: The sodium silicate pentahydrate is an industrial-grade sodium silicate pentahydrate, and the mass ratio of silicon dioxide to sodium oxide is ≥0.
98.
8. The 3D printed high-performance geopolymer concrete according to claim 1, wherein: The barium chloride is barium chloride dihydrate with a mass fraction of ≥99.5%, the particle size is 20-150 μm, and the water-insoluble substance is ≤0.01%; the borax is sodium tetraborate decahydrate with a mass fraction of ≥99.5%, and the particle size is 20-150 μm.
9. A method for the preparation of a 3D printed high-performance geopolymer concrete, the method being for the preparation of a 3D printed high-performance geopolymer concrete according to any one of claims 1 to 8, characterized in that: Including the following steps: S1: mixing fly ash, slag, quartz sand and silica ash to obtain a mixture; mixing water glass, sodium silicate pentahydrate, borax, barium chloride and water to obtain a mixed solution; S2: mixing the mixture and the mixed solution to obtain a mixture; S3: mixing polyvinyl alcohol fiber and the mixture to obtain the 3D printing high-performance geopolymer concrete.
10. Use of a 3D printed high-performance geopolymer concrete according to any one of claims 1-8, characterized in that, Including: 3D printing the 3D printing high-performance geopolymer concrete; The parameters of the 3D printing include: nozzle diameter 10-40 mm, extrusion speed 40-80 rpm, and horizontal printing speed 20-50 mm / s.