Preparation of Low-Carbon 3D Printing Concrete with Ultra-Low Cement and High Fly-Ash Cementitious System

Abstract

This application relates to the technical field of building materials, and specifically discloses a preparation method of low-carbon 3D printing concrete with an ultra-low cement and high admixture cementitious system, which comprises the following raw materials in parts by weight: 30-50 parts of portland cement, 15-20 parts of kaolin, 20-30 parts of modified quartz sand, 0.5-2 parts of water reducing agent, 0.1-0.3 parts of hydroxypropyl methyl cellulose ether, 10-15 parts of microsilica, 1-3 parts of admixture, 8-12 parts of fly ash, 18-24 parts of allyl methacrylate, and 50-60 parts of water. The modified quartz sand is obtained by being wrapped and modified with liquid crystal polymer. The preparation method is as follows: Mix and stir the modified quartz sand and allyl methacrylate, then continue to add other dry materials for secondary stirring, and then add the water reducing agent and water in two equal amounts to obtain 3D printing concrete. The composition of this application can be used in the field of 3D concrete applications with high performance requirements, and has the advantages of high compressive strength and good volume stability.

Description

Technical Field

[0001] This application relates to the technical field of building materials, and more specifically, it relates to a low-carbon 3D printing concrete prepared with an ultra-low cement and high admixture cementitious system. Background Art

[0002] With the rapid development of the construction industry, 3D printing concrete, as an emerging construction technology, is gradually showing its great potential in the construction of complex structures, improvement of construction efficiency, and material conservation. Among them, the ultra-low cement and high admixture cementitious system, as an important part of 3D printing concrete, aims to achieve low-carbon production of concrete by reducing the amount of cement used and increasing the proportion of admixtures such as industrial waste, while maintaining or improving its mechanical properties and printing performance to meet the requirements of future green buildings.

[0003] In current 3D printing concrete technology, in order to reduce carbon emissions and improve resource utilization efficiency, researchers have explored various cementitious systems with ultra-low cement content. These systems usually include industrial waste such as slag, fly ash, and silica fume as admixtures, and achieve a significant reduction in cement usage through the optimization of the mix ratio and the use of activators. However, these systems still face some challenges in practical applications, such as insufficient development of compressive strength and poor volume stability of hardened concrete.

[0004] How to significantly improve the strength and volume stability of 3D printing concrete while ensuring ultra-low cement usage to meet the requirements of 3D printing of complex structures is an urgent problem to be solved currently. Summary of the Invention

[0005] In order to improve the compressive strength and volume stability of 3D printing concrete, this application provides a low-carbon 3D printing concrete prepared with an ultra-low cement and high admixture cementitious system.

[0006] A low-carbon 3D printing concrete prepared with an ultra-low cement and high admixture cementitious system provided by this application adopts the following technical scheme:

[0007] A low-carbon 3D printing concrete prepared with an ultra-low cement and high admixture cementitious system includes the following raw materials in parts by weight:

[0008] 30 - 50 parts of portland cement, 15 - 20 parts of kaolin, 20 - 30 parts of modified quartz sand, 0.5 - 2 parts of water reducer, 0.1 - 0.3 parts of hydroxypropyl methylcellulose ether, 10 - 15 parts of microsilica, 1 - 3 parts of admixture, 8 - 12 parts of fly ash, 18 - 24 parts of allyl methacrylate, and 50 - 60 parts of water, wherein the modified quartz sand is obtained by being wrapped and modified with liquid crystal polymer.

[0009] By adopting the above technical solution, the reduction of cement dosage will lead to the reduction of the gel substances generated by the hydration reaction, thereby affecting the connection between the aggregate and the matrix material, resulting in weak connection areas and causing the overall strength of the concrete to decline. Therefore, the aggregate is wrapped with a liquid crystal polymer solution. The liquid crystal polymer has a unique molecular structure and properties, and can improve the interfacial bonding between the aggregate and the cement paste to a certain extent. By wrapping the aggregate with the liquid crystal polymer solution, a thin film can be formed on the surface of the aggregate, which can enhance the bonding force between the aggregate and the cement paste, reduce the formation of weak connection areas, and at the same time make the quartz sand better dispersed in the concrete. Further, allyl methacrylate in the raw materials reacts with the liquid crystal polymer on the surface of the aggregate to improve the compatibility between the aggregate and the matrix material, and further strengthen the interfacial bonding force of the concrete, thereby improving the compressive strength of the concrete. Micro silica fume and fly ash have a certain alkali absorption capacity. They can react with the alkali in the concrete, thereby reducing the alkali concentration in the pore solution and reducing the occurrence of alkali-silica reaction. Kaolin has good pozzolanic effect and filling effect, can improve the pore structure characteristics of the concrete, and significantly improve the mechanical properties of the concrete.

[0010] By introducing a large number of mineral admixtures such as kaolin, modified quartz sand enhanced by liquid crystal polymer wrapping, micro silica fume and fly ash, the dosage of Portland cement is effectively reduced, thereby reducing carbon emissions while using the pozzolanic effect and filling effect of these admixtures to significantly improve the compressive strength of the concrete. In addition, the addition of hydroxypropyl methyl cellulose ether and water reducer optimizes the fluidity and workability of the concrete mixture, promotes the uniform distribution and dense packing of the cement hydration products, and further enhances the volume stability and durability of the concrete. The addition of allyl methacrylate enhances the bonding force between materials through chemical action and helps to improve the overall performance of the concrete. In summary, this application realizes the dual goals of low-carbon environmental protection and high-strength concrete preparation by optimizing the material ratio and introducing high-performance admixtures and additives.

[0011] Optionally, the preparation of the modified quartz sand includes the following steps:

[0012] Take 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene and 4,5-dithiodiethylene-1,3-dithiacyclopentene-2-thione and dissolve them in toluene to form a uniform monomer solution. Continue to add 2,2-dimethoxy-2-phenylethylbenzene and stir well. Add the raw material quartz sand and impregnate it for 2-3 h. Heat to 60-70 °C and irradiate with ultraviolet light for 2-4 min. Filter and dry to obtain the modified quartz sand.

[0013] By adopting the above technical solution, 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene and 4,5-dithiodiethylene-1,3-dithiacyclopentene-2-thione are used as liquid crystal polymer precursors, heated in toluene solvent, and 2,2-dimethoxy-2-phenylethylbenzene is added as a photoinitiator at the same time. Under ultraviolet irradiation, a polymer chain with special liquid crystal properties is formed through photoinitiated free radical polymerization reaction, which adheres to the surface of quartz sand to form a uniform liquid crystal polymer film. The lubricating effect of the liquid crystal polymer film helps to improve the fluidity and workability of the concrete mixture, making the concrete more uniform and smooth during mixing, transportation and pouring. At the same time, it improves the rigidity and hardness of the aggregate, improves the bond strength between the aggregate and the cement paste, and enhances the overall strength of the concrete.

[0014] Optionally, during the preparation of the modified quartz sand, the raw materials are added according to the following parts by weight:

[0015] 30-40 parts of 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene, 8-11 parts of 4,5-dithiodiethylene-1,3-dithiacyclopentene-2-thione, 2-3 parts of 2,2-dimethoxy-2-phenylethylbenzene, 55-62 parts of toluene, and 20-30 parts of raw material quartz sand.

[0016] By adopting the above technical solution, through the control of the above raw materials, especially the control of the addition amount of each monomer, better wrapping of the quartz sand is finally achieved, and modified quartz sand with excellent performance is prepared, improving the compressive strength and volume stability of the concrete.

[0017] Optionally, the particle size of the raw material quartz sand is between 0.2-3 mm.

[0018] By adopting the above technical solution, the particle size of the quartz sand affects the final modification effect. Controlling the particle size of the quartz sand within this range is conducive to the full adsorption and penetration of the liquid crystal polymer solution, helps to form a more uniform and denser wrapping layer, and improves the modification effect. At the same time, a smaller particle size helps to fill the micro-pores in the concrete, reduce the porosity, and thus improve the compressive strength of the concrete.

[0019] Optionally, the impregnation temperature during the impregnation process is 40-50 °C.

[0020] By adopting the above technical solution, a suitable temperature helps to further promote the dissolution and mixing of the monomers, ensure the uniformity of the solution, and at the same time helps to promote the adsorption and penetration of the liquid crystal polymer on the surface of the quartz sand, form a uniform and dense wrapping layer, and improve the strength of the modified quartz sand.

[0021] Optionally, the admixture is lithium carbonate.

[0022] By adopting the above technical solution, the reactive silica component in the raw materials easily undergoes an alkali-silica reaction with the alkali in the cement to form an alkali-silica gel, which has strong water absorption. After absorbing water, it further expands, causing expansion stress inside the concrete and leading to concrete cracking. The added lithium salt and phosphate can effectively inhibit the generation of alkali-silica gel and can react with the alkali in the concrete to form stable compounds, thereby reducing the alkali concentration in the pore solution, reducing the occurrence of alkali-silica reaction, and improving the volume stability of the concrete.

[0023] Optionally, the water reducer is a polycarboxylate-based water reducer.

[0024] By adopting the above technical solution, the water-cement ratio of the concrete can be further reduced, the compactness and strength of the concrete can be improved, and it has good compatibility with components such as portland cement, kaolin, and modified quartz sand in the system, which helps to form a uniform and stable concrete paste.

[0025] Optionally, it is prepared by the following method:

[0026] (1) After weighing each raw material, mix the modified quartz sand and allyl methacrylate and conduct a primary stirring to obtain a primary mixture;

[0027] (2) Add portland cement, kaolin, microsilica, admixture, fly ash, and carboxymethyl cellulose ether to the primary mixture for secondary stirring to obtain a secondary mixture;

[0028] (3) Add the water reducer and water to the secondary mixture in two equal amounts and stir to obtain 3D printing concrete.

[0029] In summary, the present application has the following beneficial effects:

[0030] 1. Since the present application introduces a large amount of mineral admixtures such as kaolin, modified quartz sand, microsilica, and fly ash, the dosage of portland cement is significantly reduced. This proportion design not only reduces carbon emissions during cement production but also makes full use of industrial waste, achieving efficient resource utilization and circular economy. At the same time, these admixtures improve the pore structure of the concrete through their pozzolanic effect and filling effect, further enhancing the mechanical properties of the concrete.

[0031] 2. In the present application, the modified quartz sand is wrapped by a liquid crystal polymer solution, enhancing the bonding force between the aggregate and the cement paste, reducing the formation of weak connection areas, and thus improving the compressive strength of the concrete. In addition, the addition of allyl methacrylate further enhances the bonding force between materials and optimizes the interfacial bonding of the concrete.

[0032] 3. In this application, the addition of hydroxypropyl methylcellulose ether and water reducer optimizes the fluidity and workability of the concrete mixture, promotes the uniform distribution and dense packing of cement hydration products, and further enhances the volume stability and durability of the concrete. Detailed implementation mode

[0033] The following further elaborates on this application in conjunction with examples.

[0034] For those not specifying specific conditions in the examples, they are carried out according to conventional conditions or conditions recommended by the manufacturer. For reagents or instruments not indicating the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0035] Portland cement was purchased from Qianfu Mineral Products Processing Factory in Lingshou County, with a strength grade of 32.5; the specific surface area of fly ash was 300 - 500 m 2 / kg, and the loss on ignition was not more than 2%; kaolin was purchased from Ruojia Mineral Products Co., Ltd. in Lingshou County, with a screen residue of 5%, a moisture content of ≤ 2.2%, and a mesh number of 400; quartz sand was purchased from Xiaoshitou Mineral Products Co., Ltd. in Lingshou County, with a silicon dioxide content of 80%; microsilica powder was purchased from Shijiazhuang Baijiang Mineral Products Co., Ltd., with a silicon dioxide content of 93.02%.

[0036] Preparation example

[0037] Preparation example 1

[0038] A modified quartz sand, the preparation of which includes the following steps:

[0039] Take 35 kg of 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene and 10 kg of 4,5-dithiodiethylene-1,3-dithiacyclopentene-2-thione and dissolve them in 62 kg of toluene to form a uniform monomer solution. Then continue to add 3 kg of 2,2-dimethoxy-2-phenylethylbenzene and stir well. Add 25 kg of quartz sand, heat it to 50 °C and impregnate for 3 h, and then heat it to 70 °C while irradiating with ultraviolet light for 3 min to obtain the modified quartz sand, and the particle size of the quartz sand is 0.15 - 3 mm.

[0040] Preparation example 2

[0041] A modified quartz sand, the preparation of which includes the following steps:

[0042] Take 40 kg of 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene and 8 kg of 4,5-dithiobis(ethylene)-1,3-dithiacyclopentene-2-thione and dissolve them in 55 kg of toluene to form a homogeneous monomer solution. Then continue to add 2.5 kg of 2,2-dimethoxy-2-phenylethylbenzene and stir well. Add 20 kg of quartz sand and heat it at 40 °C for impregnation for 2 h. Then heat it to 60 °C and irradiate it with ultraviolet light for 4 min to obtain modified quartz sand. The particle size of the quartz sand is 0.15 - 3 mm.

[0043] Preparation Example 3

[0044] A kind of modified quartz sand, the preparation includes the following steps:

[0045] Take 30 kg of 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene and 11 kg of 4,5-dithiobis(ethylene)-1,3-dithiacyclopentene-2-thione and dissolve them in 58 kg of toluene to form a homogeneous monomer solution. Then continue to add 2 kg of 2,2-dimethoxy-2-phenylethylbenzene and stir well. Add 30 kg of quartz sand and heat it at 45 °C for impregnation for 2.5 h. Then heat it to 65 °C and irradiate it with ultraviolet light for 2 min to obtain modified quartz sand. The particle size of the quartz sand is 0.15 - 3 mm.

[0046] Preparation Example 4

[0047] A kind of modified quartz sand, different from Preparation Example 1 in that the particle size of the quartz sand added in this preparation example is 3.15 - 6 mm.

[0048] Preparation Example 5

[0049] A kind of modified quartz sand, different from Preparation Example 1 in that the particle size of the quartz sand added in this preparation example is 0.1 - 0.2 mm.

[0050] Preparation Example 6

[0051] A kind of modified quartz sand, different from Preparation Example 1 in that the impregnation is carried out at room temperature during the impregnation process.

[0052] Preparation Example 7

[0053] A kind of modified quartz sand, different from Preparation Example 1 in that the impregnation temperature is 60 °C during the impregnation process.

[0054] Example

[0055] Example 1

[0056] A preparation method for preparing low-carbon 3D printing concrete with an ultra-low cement and high admixture cementitious system includes the following steps:

[0057] After weighing each raw material, take 25 kg of modified quartz sand and mix it with 21 kg of allyl methacrylate and conduct a primary stirring to obtain a primary mixture.

[0058] Add 40 kg of portland cement, 15 kg of kaolin, 15 kg of microsilica, 2 kg of lithium carbonate (additive), 12 kg of fly ash, and 0.2 kg of hydroxymethyl cellulose ether to the primary mixture and conduct a secondary stirring to obtain a secondary mixture.

[0059] After mixing 1 kg of water reducing agent and 60 kg of water, add them to the secondary mixture in two equal amounts and stir to obtain 3D printing concrete. The water reducing agent is a polycarboxylate-based high-performance water reducing agent of DH-4005 type, and the modified quartz sand is obtained in Preparation Example 1.

[0060] Example 2

[0061] A method for preparing low-carbon 3D printing concrete using an ultra-low cement and high-volume admixture cementitious system, the preparation includes the following steps:

[0062] After weighing each raw material, take 30 kg of modified quartz sand and mix it with 18 kg of allyl methacrylate and conduct a primary stirring to obtain a primary mixture.

[0063] Add 30 kg of portland cement, 18 kg of kaolin, 10 kg of microsilica, 1 kg of lithium carbonate (additive), 10 kg of fly ash, and 0.3 kg of hydroxymethyl cellulose ether to the primary mixture and conduct a secondary stirring to obtain a secondary mixture.

[0064] After mixing 2 kg of water reducing agent and 50 kg of water, add them to the secondary mixture in two equal amounts and stir to obtain 3D printing concrete. The water reducing agent is a polycarboxylate-based high-performance water reducing agent of DH-4005 type, and the modified quartz sand is obtained in Preparation Example 2.

[0065] Example 3

[0066] A method for preparing low-carbon 3D printing concrete using an ultra-low cement and high-volume admixture cementitious system, the preparation includes the following steps:

[0067] After weighing each raw material, take 20 kg of modified quartz sand and mix it with 24 kg of allyl methacrylate and conduct a primary stirring to obtain a primary mixture.

[0068] Add 50 kg of portland cement, 20 kg of kaolin, 12.5 kg of microsilica, 3 kg of lithium carbonate (additive), 8 kg of fly ash, and 0.1 kg of hydroxymethyl cellulose ether to the primary mixture and conduct a secondary stirring to obtain a secondary mixture.

[0069] (3) After mixing 0.5 kg of water reducing agent and 55 kg of water, add them to the secondary mixture in two equal portions and stir to obtain 3D printing concrete. The water reducing agent is a polycarboxylate-based high-performance water reducing agent of DH-4005 type, and the modified quartz sand is the one prepared in Preparation Example 3.

[0070] Example 4

[0071] A low-carbon 3D printing concrete prepared by an ultra-low cement and high-volume admixture cementitious system, which is different from Example 1 in that the modified quartz sand used in this example is the one prepared in Preparation Example 4.

[0072] Example 5

[0073] A low-carbon 3D printing concrete prepared by an ultra-low cement and high-volume admixture cementitious system, which is different from Example 1 in that the modified quartz sand used in this example is the one prepared in Preparation Example 5.

[0074] Example 6

[0075] A low-carbon 3D printing concrete prepared by an ultra-low cement and high-volume admixture cementitious system, which is different from Example 1 in that the modified quartz sand used in this example is the one prepared in Preparation Example 6.

[0076] Example 7

[0077] A low-carbon 3D printing concrete prepared by an ultra-low cement and high-volume admixture cementitious system, which is different from Example 1 in that the modified quartz sand used in this example is the one prepared in Preparation Example 7.

[0078] Comparative Example

[0079] Comparative Example 1

[0080] A low-carbon 3D printing concrete prepared by an ultra-low cement and high-volume admixture cementitious system, which is different from Example 1 in that unmodified quartz sand is added in this comparative example.

[0081] Comparative Example 2

[0082] A low-carbon 3D printing concrete prepared by an ultra-low cement and high-volume admixture cementitious system, which is different from Example 1 in that allyl methacrylate is not added in this comparative example.

[0083] Comparative Example 3

[0084] A low-carbon 3D printing concrete prepared by an ultra-low cement and high-volume admixture cementitious system, which is different from Example 1 in that kaolin, microsilica and fly ash are not added in this comparative example.

[0085] Performance Detection Test

[0086] Detection Method

[0087] Compressive strength: Using 100mm×100mm×100mm cube specimens, with a loading rate of 1MPa / s, the compressive strength of the test blocks at room temperature was tested in accordance with GB / T50081-2019 "Standard Test Method for Mechanical Properties of Ordinary Concrete".

[0088] Volume stability: Referring to the shrinkage test in GBJ82 "Test Methods for Long-Term Properties and Durability of Ordinary Concrete" for the detection of volume stability, using 100×100×515mm prism specimens as standard specimens for the experiment, and calculating the average value three times to obtain the shrinkage rate.

[0089] Table 1 Test and Detection Results

[0090]

[0091] Combining Examples 1-3 and Comparative Example 1 and referring to Table 1, it can be seen that the test data of Examples 1-3 are all better than those of Comparative Example 1, indicating that on the one hand, the modified quartz sand prepared in this application improves the concrete performance by enhancing the bonding strength between the quartz sand and other components in the slurry, and on the other hand, the modification of the quartz sand by the liquid crystal polymer further improves the rigidity of the aggregate itself, thereby further enhancing the compressive strength of the concrete.

[0092] Combining Examples 1-3 and Comparative Example 2 and referring to Table 1, it can be seen that the test data of Examples 1-3 are all better than those of Comparative Example 2. The addition of allyl methacrylate can further improve the connection tightness between materials, thereby enhancing the compressive strength of the concrete.

[0093] Combining Examples 1-3 and Comparative Example 3 and referring to Table 1, it can be seen that the test data of Examples 1-3 are all better than those of Comparative Example 3, indicating that the improvement of the performance in this application partly depends on the synergistic effect of kaolin, microsilica, and fly ash with other raw materials in this application, promoting the uniform distribution and dense packing of cement hydration products, thereby enhancing the compressive strength and volume stability of the concrete.

[0094] Combining Examples 1-5 and referring to Table 1, it can be seen that the test data of Examples 1-3 are all better than those of Examples 4-5, indicating that the particle size of the quartz sand affects the modification effect. The quartz sand with an appropriate particle size not only plays a role in skeleton support in the slurry, but also is conducive to the full adsorption and penetration of the liquid crystal polymer solution, improving the modification effect, and thus enhancing the strength of the concrete.

[0095] Combining Example 1 with Examples 6 - 7 and referring to Table 1, it can be seen that all the test data of Example 1 are better than those of Examples 6 - 7. This shows that when modifying quartz sand, controlling the impregnation temperature between 40 - 50 °C is appropriate. The suitable temperature helps to promote the adsorption of the solution on the surface of quartz sand, which is beneficial to the subsequent polymerization modification process. At the same time, liquid crystal polymers can maintain their unique liquid crystal phase structure only within a specific temperature range. At a temperature of 40 - 50 °C, liquid crystal polymers can maintain good liquid crystal phase stability, which helps them to arrange in an orderly manner on the surface of quartz sand to form a uniform adsorption layer.

[0096] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A low-carbon 3D printing concrete prepared by an ultra-low cement and large admixture cementitious system, characterized in that: The composition comprises the following raw materials in parts by weight: 30-50 parts of silicate cement, 15-20 parts of kaolin, 20-30 parts of modified quartz sand, 0.5-2 parts of water reducer, 0.1-0.3 parts of hydroxypropyl methylcellulose ether, 10-15 parts of microsilica powder, 1-3 parts of lithium carbonate, 8-12 parts of fly ash, 18-24 parts of allyl methacrylate and 50-60 parts of water, wherein the modified quartz sand is obtained by encapsulating and modifying the liquid crystal polymer; The modified quartz sand preparation comprises the following steps: Take 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene and 4,5-dithiodiethylene-1,3-dithiocyclopentene-2-thione and dissolve them in toluene to form a uniform monomer solution, continue to add 2,2-dimethoxy-2-phenylacetophenone and stir thoroughly, add quartz sand and soak for 2-3 hours, heat to 60-70°C and irradiate with ultraviolet light for 2-4 minutes, filter and dry to obtain modified quartz sand.

2. The method for preparing low-carbon 3D printing concrete using an ultra-low cement large admixture cementitious system according to claim 1 is characterized in that: During the preparation of the modified quartz sand, each raw material is added according to the following weight parts: 30-40 parts of 1,4-bis[4-(6-acryloyloxyhexyloxy)benzoyloxy]-2-methylbenzene, 8-11 parts of 4,5-dithiodiethylene-1,3-dithiocyclopentene-2-thione, 2-3 parts of 2,2-dimethoxy-2-phenylacetophenone, 55-62 parts of toluene, and 20-30 parts of quartz sand.

3. The method for preparing low-carbon 3D printing concrete using an ultra-low cement large admixture cementitious system according to claim 1 is characterized in that: The particle size of the quartz sand is between 0.2 and 3 mm.

4. The method for preparing low-carbon 3D printing concrete using an ultra-low cement large admixture cementitious system according to claim 1 is characterized in that: The immersion temperature during the immersion process is 40-50°C.

5. The method for preparing low-carbon 3D printing concrete using an ultra-low cement large admixture cementitious system according to claim 1, characterized in that: The water reducing agent is a polycarboxylic acid water reducing agent.

6. The method for preparing low-carbon 3D printing concrete using an ultra-low cement large admixture cementitious system according to claim 1, characterized in that: The steps include: (1) After weighing the raw materials, the modified quartz sand and allyl methacrylate are mixed and stirred once to obtain a primary mixture; (2) adding silicate cement, kaolin, microsilica powder, lithium carbonate, fly ash and hydroxypropyl methylcellulose ether to the primary mixture for secondary stirring to obtain a secondary mixture; (3) Add equal amounts of a water reducing agent and water to the secondary mixture twice and stir to obtain 3D printed concrete.

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