3D printing residue soil baking-free brick and preparation method thereof

Abstract

The invention discloses a 3D printing residue soil baking-free brick and a preparation method thereof. The 3D printing residue soil baking-free brick is prepared from engineering residue soil, cement clinker, fly ash, slag, unsaturated fatty acid salt, silane coupling agent surface modified calcium carbonate whiskers, an initiator, a polymerization accelerator, strong alkali and a water reducing agent. The solid wastes such as the engineering residue soil are used as main components, and the mechanical property and the durability of the baking-free brick are remarkably improved by utilizing in-situ polymerization and whisker cooperative regulation and control. The preparation method is simple, high in printing adaptability, low in cost and suitable for industrial application.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of 3D printing slag soil baking-free brick, and also relates to its preparation method, belong to building solid waste resource utilization and 3D printing building material technical field. BACKGROUND

[0002] With the continuous advancement of urbanization in China, a large amount of construction waste such as engineering slag soil is generated during the process of engineering construction, and its stacking and disposal not only occupies land resources, but also may cause environmental pollution and ecological damage. How to realize the high value-added resource utilization of construction waste has become a key problem to be solved in the industry. Because of its low energy consumption and low emission characteristics, baking-free brick technology is widely regarded as a feasible utilization path for slag soil. However, the traditional baking-free brick still generally relies on a high proportion of cement clinker as cementitious material in the production process, which not only significantly increases the cost, but also brings high carbon emission problem, and it is difficult to meet the development requirements of green building materials under the "double carbon" target.

[0003] In terms of material performance, the traditional baking-free brick generally has limited mechanical properties and poor durability. To further improve the performance, the existing technology mostly uses polymer modification or fiber reinforcement means, but still faces obvious technical bottlenecks: on the one hand, although single external polymer (such as styrene-acrylic emulsion, epoxy resin, etc.) can improve the flexibility and density of the material to a certain extent, the interface between the polymer film and the inorganic hydration product is weak, and the volume shrinks significantly after film formation, which easily leads to large brittleness of the material and cracking under dry-wet cycle or temperature change conditions, and the long-term durability is limited; on the other hand, although the direct addition of reinforcing materials such as steel fiber and polypropylene fiber helps to improve the toughness and crack resistance, the lap and winding action of the fiber will seriously damage the rheological properties of the slurry, leading to a sharp decrease in flowability and extrusion difficulty, which cannot meet the strict requirements of 3D printing process on material pumpability and extrudability.

[0004] In recent years, the application of 3D printing technology in the field of construction provides a new idea for building material manufacturing, which can realize individualization, automation, low consumption and high efficiency construction. However, this technology puts forward higher requirements for printing materials: not only should it have excellent rheological properties (including appropriate yield stress, viscosity recovery ability and open time) to ensure smooth extrusion and accurate stacking, but also should quickly establish strength after printing to ensure good interlayer adhesion, and the final product should have good mechanical properties and durability. At present, the slag soil-based baking-free brick material suitable for 3D printing still faces many challenges: the early strength development of traditional cementitious system is slow, which is difficult to meet the structure establishment requirements in the printing process; single modification method cannot consider workability, mechanical properties and durability; there is a lack of synergistic optimization mechanism between material composition design and printing process parameters.

[0005] Therefore, there is an urgent need to develop a new type of 3D printing slag soil non-fired brick and a preparation method thereof, which can realize excellent rheological properties, mechanical properties and durability performance through multi-component and multi-scale synergistic modification mechanism under the premise of low cement clinker dosage and high solid waste content, and truly promote the high-value and large-scale application of building solid waste in 3D printing green building materials. SUMMARY

[0006] In view of the problems existing in the prior art, the purpose of the present application is to provide a 3D printing slag soil non-fired brick. It has excellent rheological properties, mechanical properties and durability.

[0007] Another purpose of the present application is to provide a preparation method of 3D printing slag soil non-fired brick. The method is simple, low in cost and suitable for industrial application.

[0008] In order to achieve the above technical purpose, the present application provides a 3D printing slag soil non-fired brick, which comprises engineering slag soil, cement clinker, fly ash, slag, unsaturated fatty acid salt, silane coupling agent surface modified calcium carbonate whisker, initiator, polymerization accelerator, strong alkali and water reducing agent.

[0009] The present application realizes the multiple action mechanism of "polymer network construction-whisker interface bridging-structure densification-macroscopic performance optimization" through the synergistic regulation of in-situ polymerization of unsaturated fatty acid salt and calcium carbonate whisker enhancement. Among them, the unsaturated fatty acid salt is polymerized under the action of the initiator / polymerization accelerator system in an alkaline environment, forming uniformly distributed polymer chain segments, and interweaving with the hydration products to build a flexible organic-inorganic composite network, which significantly improves the flow retention and interlayer interface bonding of the slurry; the calcium carbonate whisker, which has a high aspect ratio and a silane-treated surface, can form a mesoscopic support skeleton during printing, and a stable interface layer is formed between the polymer chain segment and the C-S-H gel, which inhibits the initiation and expansion of microcracks, thereby giving the brick higher bending and cracking resistance. The synergistic effect of the two not only overcomes the defect of brittle single polymer system, but also avoids the serious thickening problem caused by simply adding fibers, and realizes the comprehensive improvement of the 3D printing brick in mechanical properties, durability and printing adaptability.

[0010] As a preferred scheme, the 3D printing slag soil non-fired brick comprises the following components by mass:

[0011] Engineering slag soil 800-1500 parts;

[0012] Cement clinker 100-300 parts;

[0013] Fly ash 100-350 parts;

[0014] Slag 200-600 parts;

[0015] unsaturated fatty acid salt 5~30 parts;

[0016] silane coupling agent surface modified calcium carbonate whisker 20~150 parts;

[0017] early strength agent 0.5~3 parts;

[0018] initiator 0.1~3 parts;

[0019] polymerization accelerator 0.5~6 parts;

[0020] strong base 0.5~4 parts;

[0021] water reducing agent 0.1~3 parts.

[0022] The above component allocation ratio can make each component fully play a synergistic effect, and obtain a 3D printed slag soil unfired brick with excellent comprehensive performance. The synergistic effect of the unsaturated fatty acid salt and the calcium carbonate whisker can be optimized when the amount of the two components is controlled within the preferred range, ensuring the best balance between printability, mechanical strength and durability. Under the preferred ratio, the in-situ generated polymer long chain can be more tightly anchored to the surface of the silane treated whisker and the surrounding hydration products through chemical bonds and physical entanglement, forming an organic-inorganic interpenetrating network. The polymer phase fully plays the role of toughness and water retention, and the whisker provides rigidity and skeleton support, which complement each other. If the amount of either component is too high or too low, the synergistic effect will be weakened. For example, excessive amount of whisker will dominate the thickening effect in the absence of polymer network, which can lead to reduced fluidity. Excessive amount of polymer will increase the negative impact of shrinkage stress when the amount of whisker is insufficient.

[0023] A further preferred 3D printed slag soil unfired brick comprises the following components by mass:

[0024] engineering slag 1000~1300 parts;

[0025] cement clinker 150~250 parts;

[0026] fly ash 150~300 parts;

[0027] slag 300~500 parts;

[0028] unsaturated fatty acid salt 20~30 parts;

[0029] silane coupling agent surface modified calcium carbonate whisker 30~120 parts;

[0030] early strength agent 1~2 parts;

[0031] initiator 0.5~1.5 parts;

[0032] polymerization accelerator 1~3 parts;

[0033] Strong base 1~2 parts;

[0034] Water reducing agent 0.5~1.5 parts.

[0035] As a preferred solution, the silane coupling agent surface modified calcium carbonate whisker is prepared by soaking the calcium carbonate whisker in a silane coupling agent solution. The silane treatment of the calcium carbonate whisker surface can form an interface layer with the polymer segment and C-S-H gel, improving the compressive, flexural and interlaminar bonding strength.

[0036] As a preferred solution, the aspect ratio of the calcium carbonate whisker is 20~40:1. A suitable aspect ratio of the whisker is conducive to improving the performance of the material.

[0037] As a preferred solution, the silane coupling agent is KH-570.

[0038] As a preferred solution, the mass concentration of the silane coupling agent solution is 1~5%.

[0039] As a preferred solution, the soaking conditions are as follows: solid-liquid ratio mass ratio is 1:2~8, temperature is room temperature~60℃, and time is 20~60min.

[0040] As a preferred solution, the engineering slag is waste generated during the construction of a certain subway tunnel, containing soil and gravel, construction waste including concrete fragments and waste bricks, and minerals including quartz clay kaolin.

[0041] As a preferred solution, the unsaturated fatty acid salt is an acrylic acid salt.

[0042] As a preferred solution, the acrylic acid salt is sodium acrylate.

[0043] As a preferred solution, the early strength agent is a chloride-based early strength agent. For example, calcium chloride early strength agent.

[0044] As a preferred solution, the initiator is ammonium persulfate.

[0045] As a preferred solution, the polymerization accelerator is tetramethyl ethylenediamine.

[0046] As a preferred solution, the strong base includes at least one of sodium hydroxide and potassium hydroxide.

[0047] As a preferred solution, the water reducing agent is a polycarboxylic acid water reducing agent.

[0048] The application further provides a preparation method of the 3D printing construction waste soil non-burned brick.

[0049] The calcium carbonate whisker in the application improves the thixotropy and rapid structure building capacity of the system in the nozzle extrusion stage, guarantees that the layers are stacked without collapse, and the dispersion and lubrication of the polymer chain segment effectively weakens the flow loss caused by the whisker, so that the slurry has the pumpability and rapid building performance.

[0050] As a preferred scheme, the concentration of the unsaturated fatty acid salt solution is 150-450 g / L.

[0051] As a preferred scheme, the concentration of the strong alkali solution is 5-12 g / L.

[0052] As a preferred scheme, the concentration of the water reducing agent dispersion solution is 10-20 g / L.

[0053] The mass concentration of the initiator solution is 2-8%.

[0054] The mass concentration of the polymerization accelerator solution is 0.5-1.5%.

[0055] As a preferred scheme, the pH of the mixed system after the unsaturated fatty acid salt solution and the strong alkali solution are added is 10-11. Adjusting the pH value of the system in the appropriate range by the strong alkali solution can ensure that the unsaturated fatty acid salt can be effectively polymerized in the slurry.

[0056] As a preferred scheme, the water-binder ratio of the pumpable thixotropic slurry is 0.1-0.6.

[0057] As a preferred scheme, the surface of the printed layer is atomized and sprayed with the sodium acrylate aqueous solution as an interface promoter before printing a new layer. The mass concentration of the sodium acrylate aqueous solution is preferably 1%-3%.

[0058] As a preferred scheme, the curing process is: wet curing and standard curing are sequentially performed.

[0059] Compared with the prior art, the application has the following beneficial effects:

[0060] (1) The unsaturated fatty acid salt and the silane coupling agent surface modified calcium carbonate whisker synergistically act to make the unfired brick have excellent rheological properties, mechanical properties and durability, wherein the formed polymer network can inhibit free water migration, the whisker limits microcrack expansion, CO2 promotes carbonization to further form a dense structure, and the impermeability, freeze-thaw resistance and dimensional stability are improved;

[0061] (2) The preparation method is simple, wherein the slurry of the present application can maintain moderate fluidity in the nozzle, quickly shape within 30-60 seconds after extrusion, avoid collapse, and has high printing adaptability; the segmented initiator / polymerization accelerator initiation system ensures controllable polymerization rate, and in combination with the alkalization environment, the "pumpable-extrudable-stackable" window can be adjusted, and the process has strong controllability; the present application uses engineering sludge (utilization rate > 70%), slag and fly ash solid waste as main raw materials, the cement clinker content is significantly reduced, the solid waste resource utilization rate is significantly improved, the raw material cost is reduced, and the energy-saving and environment-friendly baking-free process is adopted. DETAILED DESCRIPTION

[0062] The technical solutions of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0063] The polycarboxylate superplasticizer used in the present application is purchased from Hua Xuan PC-3008.

[0064] Embodiment 1

[0065] Prepare raw materials: 1200 parts of sludge, 200 parts of cement clinker, 250 parts of fly ash, 400 parts of slag powder, 1.5 parts of polycarboxylate superplasticizer, 1 part of early strength agent, 25 parts of sodium acrylate, 1.5 parts of ammonium persulfate, 3 parts of TEMED (tetramethyl ethylenediamine), 2 parts of sodium hydroxide, 120 parts of silane coupling agent surface modified calcium carbonate whisker, and 340 parts of water.

[0066] The preparation steps are as follows:

[0067] (1) Sludge pretreatment: pass through an 8-10 mm sieve, remove organic impurities and large particles; adjust the moisture content to 6-10% free water to ensure stable printing feed.

[0068] (2) Whisker surface modification and dispersion: immerse the calcium carbonate whisker in a 2wt% KH-570 ethanol solution at room temperature for 60 min, with a solid-liquid mass ratio of 1:5, and then dry at 60℃ to obtain the silane coupling agent surface modified calcium carbonate whisker.

[0069] (3) The above water is used to prepare sodium acrylate solution (300 g / L), sodium hydroxide solution (9 g / L), polycarboxylate superplasticizer dispersion (10 g / L), ammonium persulfate solution (5% by mass), and tetramethyl ethylenediamine solution (1% by mass), and the rest of the water is used as mixing water.

[0070] (4) The engineering sludge, cement clinker, calcium chloride early strength agent, and silane coupling agent surface modified calcium carbonate whisker are mixed and dry-mixed, and then sodium acrylate solution, sodium hydroxide solution, and polycarboxylate superplasticizer dispersion and mixing water are added and mixed and stirred to form a pumpable thixotropic paste;

[0071] (5) Within 2-5 minutes before printing is planned, ammonium persulfate aqueous solution with a mass concentration of 5% is added to the stirring slurry, and continuous stirring is performed to make it uniformly mixed. At this time, the slurry still maintains a good flow state for pumping. Subsequently, the slurry is pumped into the feeding system through a screw extrusion type or plunger pump type printing device, and at the end of the feeding pipe, five to fifteen centimeters away from the nozzle inlet, tetramethyl ethylenediamine aqueous solution with a concentration of 1% is added dropwise online through a precision micro pump. The slurry is fully mixed with the polymerization accelerator when it flows through the internal spiral structure or static mixer of the nozzle, and the oxidation-reduction system is immediately activated to initiate polymerization, so that the material rapidly establishes structural strength within 30-120 seconds of extrusion, thereby achieving good stackability. In the printing process, a small amplitude of online vibration can be applied to improve the extrusion smoothness and profile flatness, and a short intermittent stop strategy of 10-20 seconds is used as necessary to enhance the carrying capacity of the printed layer. Before printing a new layer, the surface of the printed layer is sprayed with sodium acrylate aqueous solution with a mass concentration of 2% as an interfacial promoter. This treatment can provide additional polymerization reaction sites and chemical bonding opportunities for the newly extruded slurry, further improving the interlayer adhesion performance and impermeability.

[0072] (5) Curing: first wet curing (24 h), and then standard curing (20±2℃, ≥95% RH), using calcium hydroxide to react with the whisker surface to generate a dense carbonate layer, to improve early strength and durability; the whole process does not go through high-temperature sintering, and is distinguished from the traditional sintered brick process.

[0073] Example 2

[0074] Preparation of raw materials: sludge 1200 parts, cement clinker 200 parts, fly ash 250 parts, slag powder 400 parts, polycarboxylate superplasticizer 1.5 parts, calcium chloride early strength agent 1 part, sodium acrylate 25 parts, ammonium persulfate 1.2 parts, TEMED 2.4 parts, NaOH 2 parts, silane coupling agent surface modified calcium carbonate whisker 50 parts, and water 340 parts.

[0075] The unfired brick was prepared by the method of Example 1.

[0076] Example 3

[0077] Preparation of raw materials: 1200 parts of slag, 200 parts of cement clinker, 250 parts of fly ash, 400 parts of slag powder, 1.5 parts of polycarboxylic acid water reducer, 1 part of early strength agent, 50 parts of sodium acrylate, 3 parts of ammonium persulfate, 6 parts of TEMED, 4 parts of NaOH, 120 parts of surface-modified calcium carbonate whisker with silane coupling agent, and 340 parts of water.

[0078] The unfired brick was prepared by the method of Example 1.

[0079] Example 4

[0080] Preparation of raw materials: 1200 parts of slag, 200 parts of cement clinker, 250 parts of fly ash, 400 parts of slag powder, 1.5 parts of polycarboxylic acid water reducer, 1 part of early strength agent, 25 parts of sodium acrylate, 1.5 parts of ammonium persulfate, 3 parts of TEMED, 2 parts of NaOH, 240 parts of surface-modified calcium carbonate whisker with silane coupling agent, and 340 parts of water.

[0081] The unfired brick was prepared by the method of Example 1.

[0082] Comparative Example 1

[0083] Preparation of raw materials: 1200 parts of slag, 200 parts of cement clinker, 200 parts of fly ash, 400 parts of slag powder, 1 part of polycarboxylic acid water reducer, 1 part of early strength agent, 300 parts of water, and no addition of sodium acrylate, NaOH, and whisker.

[0084] The unfired brick was prepared by the method of Example 1.

[0085] Comparative Example 2

[0086] Preparation of raw materials: 1200 parts of slag, 200 parts of cement clinker, 200 parts of fly ash, 400 parts of slag powder, 1 part of polycarboxylic acid water reducer, 1 part of early strength agent, 15 parts of sodium acrylate, 1 part of ammonium persulfate, 2 parts of TEMED, 1 part of NaOH, and 300 parts of water.

[0087] The unfired brick was prepared by the method of Example 1.

[0088] Comparative Example 3

[0089] Preparation of raw materials: 1200 parts of slag, 200 parts of cement clinker, 200 parts of fly ash, 400 parts of slag powder, 1 part of polycarboxylic acid water reducer, 1 part of early strength agent, 25 parts of sodium acrylate, 1.5 parts of ammonium persulfate, 3 parts of TEMED, 1.5 parts of NaOH, and 320 parts of water.

[0090] The unfired brick was prepared by the method of Example 1.

[0091] Comparative Example 4

[0092] Preparation of raw materials: slag 1200 parts, cement clinker 200 parts, fly ash 200 parts, slag powder 400 parts, polycarboxylic acid water reducer 1 part, early strength agent 1 part, silane coupling agent surface modified calcium carbonate whisker 50 parts, and water 310 parts.

[0093] The non-burned brick was prepared by the method of Example 1.

[0094] Comparative Example 5

[0095] Preparation of raw materials: slag 1300 parts, cement clinker 180 parts, fly ash 200 parts, slag powder 420 parts, polycarboxylic acid water reducer 1 part, early strength agent 1 part, silane coupling agent surface modified calcium carbonate whisker 100 parts, and water 330 parts.

[0096] The non-burned brick was prepared by the method of Example 1.

[0097] The non-burned bricks prepared in each example and comparative example were tested for performance, and the results are shown in Tables 1-4.

[0098] Among them, the mechanical property test refers to the standard GB / T 50081-2019 of concrete physical and mechanical property test method; the durability test refers to the standard GB / T 50082-2024 of long-term performance and durability of ordinary concrete; the working performance test refers to the standard GB / T 50080-2016 of ordinary concrete mixture performance test method; and the rheological property test with time refers to ISO / TR20659-1:2024.

[0099]

[0100]

[0101]

[0102]

[0103] The comparative example 1 has low strength and poor durability, the 28d compressive strength is only 11.5 MPa, the flexural strength is 1.2 MPa, the dry shrinkage strain is as high as 1200 με, the strength loss rate of dry-wet cycle is as high as 32%, the printable layer number is only 4 layers, the yield stress and viscosity sharply increase with time, the thixotropic recovery rate is as low as 50-60%, and serious flow attenuation and structural instability are exhibited. After the introduction of polymers alone (comparative examples 2 and 3), the compressive strength, flexural strength and the like are slightly improved, but the improvement effect and comprehensive performance are general. The addition of whiskers alone (comparative examples 4 and 5) is more prominent in mechanical properties, the compressive strength, flexural strength, dry shrinkage strain and interlayer bonding strength are reduced, the printable layer number reaches 6-8 layers, but the fluidity and pumpability are reduced, the initial yield stress increases, the plastic viscosity increases, and there is a strong thickening effect. The unfired brick prepared by the embodiment of the present application has excellent comprehensive performance, wherein the comprehensive performance of the synergistic modification system of example 1 is the best, the 28d compressive strength reaches 26.8 MPa, the flexural strength is 4.5 MPa, the interlayer bonding strength is increased to 2.5 MPa, the dry shrinkage strain is reduced to 520 με, the strength loss rate of dry-wet cycle is only 8%, and the impermeability and freeze-thaw resistance are significantly improved. At the same time, the rheological performance thereof over time is as follows: the initial yield stress is 65 Pa, the plastic viscosity is 5.5 Pa·s, which is far lower than the sharply thickening trend of the whisker single-doped system with time; the yield stress and viscosity are controlled within 240 Pa and 7.5 Pa·s at 60 min, the thixotropic recovery rate is maintained above 84%, which ensures that the 3D printing process can be smoothly pumped and extruded, and the rapid structure establishment and stable interlayer lapping are realized.

[0104] Therefore, the "polymer-whisker synergistic regulation" technical path proposed by the present application effectively realizes the balance of rheological performance, mechanical performance and durability, significantly improves the 3D printing adaptability and service performance of the slag unfired brick, and achieves the comprehensive technical effect that cannot be achieved by single modification method.

Claims

1. A 3D-printed non-fired brick made from slag, characterized in that: This includes construction waste, cement clinker, fly ash, slag, unsaturated fatty acid salts, calcium carbonate whiskers modified with silane coupling agents, initiators, polymerization promoters, strong alkalis, and water-reducing agents.

2. The 3D-printed non-fired brick made from slag as described in claim 1, characterized in that: Includes the following components by weight: 800-1500 portions of construction waste; 100-300 parts of cement clinker; 100-350 parts fly ash; 200-600 parts of slag; 5-30 parts of unsaturated fatty acid salts; 20-150 parts of calcium carbonate whiskers with silane coupling agent surface modification; Early-strength agent 0.5-3 parts; Initiator 0.1-3 parts; Polymerization accelerator 0.5-6 parts; Strong alkali 0.5-4 parts; Water-reducing agent: 0.1-3 parts.

3. The 3D-printed non-fired brick made from slag as described in claim 2, characterized in that: Includes the following components by weight: 1000-1300 portions of construction waste; 150-250 parts of cement clinker; 150-300 parts of fly ash; 300-500 parts of slag; 20-30 parts of unsaturated fatty acid salts; 30-120 parts of calcium carbonate whiskers with silane coupling agent surface modification; Early-strength agent 1-2 parts; Initiator 0.5~1.5 parts; Polymerization accelerator 1-3 parts; 1-2 parts strong alkali; 0.5 to 1.5 parts of water-reducing agent.

4. The 3D-printed non-fired brick made from slag as described in claim 1, characterized in that: The silane coupling agent-modified calcium carbonate whiskers are prepared by soaking calcium carbonate whiskers in a silane coupling agent solution.

5. The 3D-printed non-fired brick made from slag as described in claim 4, characterized in that: The aspect ratio of the calcium carbonate whiskers is 20~40:1; The silane coupling agent is KH-570; The mass concentration of the silane coupling agent solution is 1-5%.

6. The 3D-printed non-fired brick made from slag as described in claim 1, characterized in that: The unsaturated fatty acid salt is an acrylate salt.

7. A 3D-printed non-fired brick made from slag as described in claim 6, characterized in that: The acrylate is sodium acrylate.

8. The 3D-printed non-fired brick made from slag as described in claim 1, characterized in that: The initiator is ammonium persulfate; The polymerization promoter is tetramethylethylenediamine; The strong base includes at least one of sodium hydroxide and potassium hydroxide; The water-reducing agent is a polycarboxylate water-reducing agent.

9. A method for preparing 3D-printed non-fired bricks from slag as described in any one of claims 1 to 8, characterized in that: First, engineering waste soil, cement clinker, fly ash, slag, calcium carbonate whiskers modified with silane coupling agent and early strength agent are mixed. Then, unsaturated fatty acid salt solution, strong alkali solution, water-reducing agent dispersion and water are added and mixed to obtain a pumpable thixotropic slurry. Then, an initiator solution is added to the pumpable thixotropic slurry and it is transported to an extrusion device. At the same time, a polymerization accelerator solution is added to the extruded material at the end of the feed pipe or the nozzle inlet of the extrusion device. 3D printing is performed, and the resulting coarse bricks are then cured to obtain the final product.

10. A method for preparing 3D-printed non-fired bricks from slag as described in claim 9, characterized in that: The concentration of the unsaturated fatty acid salt solution is 150~450g / L; The concentration of the strong alkali solution is 5~12 g / L; The concentration of the water-reducing agent dispersion is 10~20g / L; The initiator solution has a mass concentration of 2-8%; The mass concentration of the polymerization accelerator solution is 0.5~1.5%.

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