Preparation process of novel geopolymer-based foam light soil

Abstract

The invention relates to the technical field of building materials, and particularly discloses a preparation process of novel geopolymer-based foam light soil. The novel geopolymer-based foam light soil comprises 45-65 parts of blast furnace slag micropowder, 30-50 parts of gasified slag, 15-25 parts of iron tailing mud, 4-8 parts of silica fume, 2-8 parts of a phase change material, 1-6 parts of a surfactant, 0.5-1 part of a foaming agent and 1-4 parts of a polycarboxylate superplasticizer. The preparation method comprises the following steps: uniformly mixing blast furnace slag micro powder, gasified slag, iron tailing mud, a phase change material and water to obtain slurry A; uniformly mixing silica fume, a surfactant, a foaming agent and water to obtain slurry B; uniformly mixing the slurry A and the slurry B to obtain mixed slurry; and curing the mixed slurry in an environment with the temperature of 30 + / -20 DEG C and the relative humidity of 52-80% to obtain the novel geopolymer-based foam light soil. The adaptability of the geopolymer-based foam light soil to the temperature and humidity in the curing process can be improved, the production cost is reduced, and the characteristics of good mechanical property, light weight, easy construction and the like are kept.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, in particular to a preparation process of a novel geopolymer-based foamed lightweight soil. Background Art

[0002] In the field of civil engineering and construction, seeking a new material that can reduce the weight of the structure, improve construction efficiency, and have environmental protection characteristics has always been a hot topic in scientific research and practice. Geopolymer-based foamed lightweight soil is an innovative material that came into being under this background. Geopolymer-based foamed lightweight soil combines the high strength and durability of geopolymers with the light weight and easy construction characteristics of foamed lightweight soil, providing a new solution for modern construction projects.

[0003] In the related art, a method for producing fly ash geopolymer foam concrete is disclosed, which comprises the following raw materials in parts by weight: 60-85 parts of fly ash, 30-50 parts of alkali slag, 0.5-0.7 parts of grinding aid, 4-8 parts of silica fume, 1-6 parts of surfactant, 0.35-0.72 parts of foaming agent, 2-5 parts of sodium hydroxide and 3-5 parts of water glass. The above raw materials are prepared according to the following steps: 1) fly ash, alkali residue and water are mixed and sent to a wet ball mill, and then a grinding aid is added to the wet ball mill for grinding to obtain slurry A; 2) silica fume, surfactant and foaming agent are sent to a wet ball mill, and then water is added to the wet ball mill for wet grinding to obtain slurry B; 3) slurry A obtained in step 1) and slurry B obtained in step 2) are mixed to obtain mixed slurry C; 4) sodium hydroxide and water glass are added to slurry C to obtain fly ash geopolymer foam concrete solid-liquid mixed slurry; 5) the fly ash geopolymer foam concrete solid-liquid mixed slurry is cured in an environment with a temperature of 20±2° C. and a relative humidity of about 60-70% to form fly ash geopolymer foam concrete.

[0004] In the above fly ash geopolymer foam concrete method, the curing process needs to be carried out under the conditions of 20±2°C and 60-70% relative humidity. Maintaining such a curing environment requires specific equipment and sites, resulting in high production costs. Therefore, it is necessary to develop a new type of geopolymer-based foamed lightweight soil with lower requirements for the curing environment to reduce the investment in maintaining the curing environment and reduce production costs. Summary of the invention

[0005] In order to improve the adaptability of geopolymer-based foamed lightweight soil to temperature and humidity during the curing process, the present application provides a novel preparation process of geopolymer-based foamed lightweight soil.

[0006] In the first aspect, the present application provides a novel geopolymer-based foamed lightweight soil, which adopts the following technical solution:

[0007] A novel geopolymer-based foamed lightweight soil comprises the following raw materials in parts by weight: 45-65 parts of blast furnace slag powder, 30-50 parts of gasified slag, 15-25 parts of iron tailings mud, 4-8 parts of silica fume, 2-8 parts of phase change material, 1-6 parts of surfactant, 0.5-1 parts of foaming agent and 1-4 parts of polycarboxylic acid water reducer.

[0008] By adopting the above technical scheme, blast furnace slag powder and gasified slag are used as the main inorganic gelling materials, and gel reaction is generated through alkali excitation to form a three-dimensional network structure of geopolymer-based foamed lightweight soil. Silica fume can further enhance the activity of the gel reaction. Iron tailings mud can fill the gaps between large particles, optimize the microstructure, and improve the mechanical properties of geopolymer-based foamed lightweight soil. Phase change materials can absorb or release heat during the curing process, adjust the temperature inside the lightweight soil, reduce microcracks caused by temperature fluctuations, and thus enhance its temperature adaptability. Polycarboxylate water reducer can adjust the water consumption during the curing process to reduce the influence of humidity on the curing effect. Surfactants can reduce the surface tension of water and help the foaming agent to produce uniform and stable foam. These foams form a porous structure in the lightweight soil, giving it lightweight and heat-insulating properties.

[0009] Therefore, the novel geopolymer-based foamed lightweight soil of the present application can improve the adaptability of geopolymer-based foamed lightweight soil to temperature and humidity during the curing process, reduce production costs, and maintain good mechanical properties and characteristics such as light weight and easy construction.

[0010] In a specific embodiment, the surfactant is a mixture of polyoxyethylene fatty acid ester and sodium oleate in a weight ratio of 1:(0.6-2).

[0011] By adopting the above technical scheme, fatty acid polyoxyethylene ester and sodium oleate cooperate with each other to produce stable and delicate foam during the foaming process. The mixture of fatty acid polyoxyethylene ester and sodium oleate has a lower surface tension, which is conducive to the formation of foam and can slow down the bursting speed of foam, thereby ensuring that the foam structure in the lightweight soil is more uniform, and can also reduce the surface tension of water, which helps to introduce air into the geopolymer-based foam lightweight soil. The present application has found through experiments that the novel geopolymer-based foam lightweight soil prepared by using the above-mentioned proportion of fatty acid polyoxyethylene ester and sodium oleate has lighter weight and better mechanical properties.

[0012] In a specific embodiment, the phase change material includes at least one of stearic acid, palmitic acid, and paraffin.

[0013] By adopting the above technical solution, the above phase change materials all have the ability to absorb and release heat within a specific temperature range. Moreover, they are natural or renewable resources with little impact on the environment. Incorporating these materials into the lightweight soil formula can improve the utilization efficiency of resources and promote the greening and sustainable development of building materials.

[0014] In a specific embodiment, the phase change material is a mixture of palmitic acid, paraffin and desulfurized gypsum in a weight ratio of 1:(2-6):(5-10).

[0015] By adopting the above technical solution, the above phase change material combination has efficient heat absorption and heat release performance in a wide temperature range. When the ambient temperature changes, the mixture can absorb or release a large amount of heat, thereby maintaining the stability of the internal temperature of the lightweight soil. Palmitic acid, paraffin and desulfurized gypsum have little impact on the environment and are renewable resources or industrial waste, which can improve the utilization efficiency of resources. Moreover, within the above ratio range, it helps to further improve the adaptability of geopolymer-based foam lightweight soil to temperature during the curing process.

[0016] In a specific embodiment, the novel geopolymer-based foamed lightweight soil further comprises polysiloxane.

[0017] By adopting the above technical solution, polysiloxane can effectively reduce the surface tension of the foam and improve the stability of the foam, thereby increasing the air content inside the geopolymer-based foamed lightweight soil and reducing the mass of the geopolymer-based foamed lightweight soil.

[0018] In a specific embodiment, the blowing agent is azodicarbonamide.

[0019] By adopting the above technical solution, during the foaming process, azodicarbonamide is first decomposed by heat to release a large amount of gas, which forms tiny bubbles in the light soil. At the same time, polysiloxane molecules quickly migrate to the surface of the bubbles to form a tough film to prevent the bubbles from merging or breaking. This synergistic effect makes the foam structure in the light soil more uniform and stable, thereby significantly improving the overall performance of the light soil.

[0020] In a specific embodiment, the novel geopolymer-based foamed lightweight soil further comprises: at least one of silicate, clay or glass fiber.

[0021] By adopting the above technical scheme, silicates can refine the pore structure in geopolymer-based foam lightweight soil, reduce the initiation and expansion paths of cracks, and thus improve the crack resistance of geopolymer-based foam lightweight soil. Clay has good plasticity and viscosity, and can form a lubricating film layer in geopolymer-based foam lightweight soil, which can effectively relieve stress concentration and prevent the rapid development of cracks. Glass fiber has excellent properties such as high strength and high modulus, which can hinder the further expansion of cracks and absorb the energy required for crack expansion. Adding silicates, clay or glass fibers can improve the crack resistance of geopolymer-based foam lightweight soil and prevent geopolymer-based foam lightweight soil from cracking in a wider temperature range and humidity range.

[0022] In a specific embodiment, the particle size of the gasified slag is 100-600 μm.

[0023] By adopting the above technical solution, the present applicant has found that adding gasified slag within the above particle size range can further improve the mechanical properties of geopolymer-based foamed lightweight soil and improve the adaptability of geopolymer-based foamed lightweight soil to curing temperature and humidity.

[0024] In the second aspect, the present application provides a novel process for preparing geopolymer-based foamed lightweight soil, which adopts the following technical solution:

[0025] A novel process for preparing geopolymer-based foamed lightweight soil comprises the following steps:

[0026] The blast furnace slag powder, gasified slag, iron tailings mud, phase change material and water are uniformly mixed to obtain slurry A;

[0027] Mix silica fume, surfactant, foaming agent and water evenly to obtain slurry B;

[0028] Mix slurry A and slurry B evenly to obtain a mixed slurry;

[0029] The mixed slurry is cured in an environment with a temperature of 30±20° C. and a relative humidity of 52-80% to obtain a novel geopolymer-based foamed lightweight soil.

[0030] By adopting the above technical solution, this process uses industrial waste such as blast furnace slag powder, gasified slag and iron tailings mud as the main raw materials, which not only reduces production costs, but also realizes the resource utilization of waste, which helps to reduce environmental pollution. The entire preparation process is carried out within a relatively wide temperature and humidity range, which not only has low energy consumption, but also reduces more applicable scenarios.

[0031] In summary, this application has the following beneficial effects:

[0032] 1. This application can improve the adaptability of geopolymer-based foam lightweight soil to temperature and humidity during the curing process, reduce production costs, maintain good mechanical properties and characteristics such as light weight and easy construction.

[0033] 2. In the present application, a mixture of polyoxyethylene fatty acid ester and sodium oleate in a weight ratio of 1:(0.6-2) is preferably used to prepare a new type of geopolymer-based foamed lightweight soil having lighter weight and better mechanical properties.

[0034] 3. The method of the present application uses industrial waste as the main raw material, which reduces production costs, realizes resource utilization of waste, and helps reduce environmental pollution. DETAILED DESCRIPTION

[0035] The present application is further described in detail below in conjunction with embodiments and comparative examples.

[0036] Example

[0037] Example 1

[0038] The present embodiment provides a novel geopolymer-based foamed lightweight soil, comprising the following raw materials: 55 kg of blast furnace slag powder, 40 kg of gasified slag with a particle size of 100-300 μm, 20 kg of iron tailings mud, 6 kg of silica ash, 4.5 kg of paraffin, 3.25 kg of fatty acid polyoxyethylene ester, 0.75 kg of azodicarbonamide, and 2.5 kg of polycarboxylic acid water reducer (model: CP1801X).

[0039] The preparation process of the novel geopolymer-based foamed lightweight soil comprises the following steps:

[0040] Add blast furnace slag powder, gasified slag, iron tailings mud and paraffin into water and stir evenly to obtain slurry A;

[0041] Add silica fume, fatty acid polyoxyethylene ester and azodicarbonamide into water and stir evenly to obtain slurry B;

[0042] Under stirring, slurry A is added to slurry B, and after stirring evenly, a mixed slurry is obtained;

[0043] The mixed slurry is cured for 28 days in an environment where the temperature is constantly changing within the range of 30±15°C and the relative humidity is constantly changing within the range of 62-70%, thereby obtaining a novel geopolymer-based foamed lightweight soil.

[0044] Example 2

[0045] The only difference between this embodiment and embodiment 1 is that the new geopolymer-based foamed lightweight soil includes the following raw materials: 65 kg of blast furnace slag powder, 30 kg of gasified slag with a particle size of 100-300 μm, 15 kg of iron tailings mud, 8 kg of silica ash, 8 kg of paraffin, 6 kg of fatty acid polyoxyethylene ester, 1 kg of azodicarbonamide, and 4 kg of polycarboxylic acid water reducer (model: CP1801X).

[0046] Example 3

[0047] The only difference between this embodiment and embodiment 1 is that the new geopolymer-based foamed lightweight soil includes the following raw materials: 45 kg of blast furnace slag powder, 50 kg of gasified slag with a particle size of 100-300 μm, 25 kg of iron tailings mud, 4 kg of silica ash, 2 kg of paraffin, 1 kg of fatty acid polyoxyethylene ester, 0.5 kg of azodicarbonamide, and 1 kg of polycarboxylic acid water reducer (model: CP1801X).

[0048] Example 4

[0049] The only difference between this example and Example 1 is that an equal amount of palmitic acid is used to replace paraffin.

[0050] Example 5

[0051] The only difference between this embodiment and embodiment 1 is that the paraffin is replaced by an equal amount of stearic acid.

[0052] Example 6

[0053] The only difference between this embodiment and embodiment 1 is that an equal amount of desulfurized gypsum is used to replace paraffin.

[0054] Example 7

[0055] The only difference between this embodiment and embodiment 1 is that the paraffin is replaced by an equal amount of a mixture of palmitic acid, paraffin and desulfurized gypsum in a weight ratio of 1:1:4.

[0056] Example 8

[0057] The only difference between this embodiment and embodiment 1 is that the paraffin is replaced by an equal amount of a mixture of palmitic acid, paraffin and desulfurized gypsum in a weight ratio of 1:2:5.

[0058] Example 9

[0059] The only difference between this embodiment and embodiment 1 is that the paraffin is replaced by an equal amount of a mixture of palmitic acid, paraffin and desulfurized gypsum in a weight ratio of 1:4:7.

[0060] Example 10

[0061] The only difference between this embodiment and embodiment 1 is that the desulfurized gypsum is replaced by an equal amount of a mixture of palmitic acid, paraffin and desulfurized gypsum in a weight ratio of 1:6:10.

[0062] Embodiment 11

[0063] The only difference between this embodiment and embodiment 1 is that the desulfurized gypsum is replaced by an equal amount of a mixture of palmitic acid, paraffin and desulfurized gypsum in a weight ratio of 1:7:11.

[0064] Example 12

[0065] The only difference between this embodiment and embodiment 1 is that the desulfurized gypsum is replaced by a mixture of equal amounts of stearic acid, paraffin wax and desulfurized gypsum in a weight ratio of 1:6:10.

[0066] Example 13

[0067] The only difference between this embodiment and embodiment 1 is that the fatty acid polyoxyethylene ester is replaced by an equal amount of a mixture of fatty acid polyoxyethylene ester and sodium oleate in a weight ratio of 1:0.3.

[0068] Embodiment 14

[0069] The only difference between this embodiment and embodiment 1 is that the fatty acid polyoxyethylene ester is replaced by an equal amount of a mixture of fatty acid polyoxyethylene ester and sodium oleate in a weight ratio of 1:0.6.

[0070] Embodiment 15

[0071] The only difference between this embodiment and embodiment 1 is that the fatty acid polyoxyethylene ester is replaced by an equal amount of a mixture of fatty acid polyoxyethylene ester and sodium oleate in a weight ratio of 1:1.3.

[0072] Example 16

[0073] The only difference between this embodiment and embodiment 1 is that the fatty acid polyoxyethylene ester is replaced by an equal amount of a mixture of fatty acid polyoxyethylene ester and sodium oleate in a weight ratio of 1:2.

[0074] Embodiment 17

[0075] The only difference between this embodiment and embodiment 1 is that the fatty acid polyoxyethylene ester is replaced by an equal amount of a mixture of fatty acid polyoxyethylene ester and sodium oleate in a weight ratio of 1:2.5.

[0076] Embodiment 18

[0077] The only difference between this embodiment and embodiment 1 is that an equal amount of sodium oleate is used to replace the polyoxyethylene fatty acid ester.

[0078] Embodiment 19

[0079] The only difference between this embodiment and embodiment 1 is that the gasified slag with a particle size of 100-300 μm is replaced by an equal amount of gasified slag with a particle size of 50-100 μm.

[0080] Embodiment 20

[0081] The only difference between this embodiment and embodiment 1 is that the gasified slag with a particle size of 100-300 μm is replaced by an equal amount of gasified slag with a particle size of 300-600 μm.

[0082] Embodiment 21

[0083] The only difference between this embodiment and embodiment 1 is that the gasified slag with a particle size of 100-300 μm is replaced by an equal amount of gasified slag with a particle size of 600-900 μm.

[0084] Embodiment 22

[0085] The difference between this embodiment and embodiment 1 is that the novel geopolymer-based foamed lightweight soil includes the following raw materials: 55 kg blast furnace slag powder, 40 kg gasified slag with a particle size of 100-300 μm, 20 kg iron tailings mud, 6 kg silica fume, 4.5 kg paraffin, 3.25 kg fatty acid polyoxyethylene ester, 0.75 kg azodicarbonamide, 2.5 kg polycarboxylic acid water reducer (model: CP1801X), and 0.5 kg polysiloxane. In the preparation process of the novel geopolymer-based foamed lightweight soil: silica fume, fatty acid polyoxyethylene ester, azodicarbonamide and polysiloxane are added to water and stirred evenly to obtain slurry B;

[0086] Embodiment 23

[0087] The difference between this embodiment and embodiment 1 is that the novel geopolymer-based foamed lightweight soil includes the following raw materials: 55 kg blast furnace slag powder, 40 kg gasified slag with a particle size of 100-300 μm, 20 kg iron tailings mud, 6 kg silica fume, 4.5 kg paraffin, 3.25 kg fatty acid polyoxyethylene ester, 0.75 kg azodicarbonamide, 2.5 kg polycarboxylic acid water reducer (model: CP1801X), and 2 kg silicate. In the preparation process of the novel geopolymer-based foamed lightweight soil: blast furnace slag powder, gasified slag, iron tailings mud, paraffin, and silicate are added to water and stirred evenly to obtain slurry A.

[0088] Embodiment 24

[0089] The difference between this embodiment and embodiment 1 is that the novel geopolymer-based foamed lightweight soil includes the following raw materials: 55 kg blast furnace slag powder, 40 kg gasified slag with a particle size of 100-300 μm, 20 kg iron tailings mud, 6 kg silica fume, 4.5 kg paraffin, 3.25 kg fatty acid polyoxyethylene ester, 0.75 kg azodicarbonamide, 2.5 kg polycarboxylic acid water reducer (model: CP1801X), and 2 kg clay. In the preparation process of the novel geopolymer-based foamed lightweight soil: blast furnace slag powder, gasified slag, iron tailings mud, paraffin, and clay are added to water and stirred evenly to obtain slurry A.

[0090] Embodiment 25

[0091] The difference between this embodiment and embodiment 1 is that the novel geopolymer-based foamed lightweight soil includes the following raw materials: 55 kg blast furnace slag powder, 40 kg gasified slag with a particle size of 100-300 μm, 20 kg iron tailings mud, 6 kg silica fume, 4.5 kg paraffin, 3.25 kg fatty acid polyoxyethylene ester, 0.75 kg azodicarbonamide, 2.5 kg polycarboxylic acid water reducer (model: CP1801X), and 2 kg glass fiber. In the preparation process of the novel geopolymer-based foamed lightweight soil: blast furnace slag powder, gasified slag, iron tailings mud, paraffin, and glass fiber are added to water and stirred evenly to obtain slurry A.

[0092] Embodiment 26

[0093] The only difference between this embodiment and Embodiment 1 is that in the preparation process of the novel geopolymer-based foamed lightweight soil: the mixed slurry is cured for 28 days in an environment where the temperature continuously changes within the range of 30±10°C and the relative humidity continuously changes within the range of 57-75% to obtain the novel geopolymer-based foamed lightweight soil.

[0094] Embodiment 27

[0095] The only difference between this embodiment and Embodiment 1 is that in the preparation process of the novel geopolymer-based foamed lightweight soil: the mixed slurry is cured for 28 days in an environment where the temperature continuously changes within the range of 30±5°C and the relative humidity continuously changes within the range of 57-75% to obtain the novel geopolymer-based foamed lightweight soil.

[0096] Embodiment 28

[0097] The only difference between this embodiment and Embodiment 1 is that in the preparation process of the novel geopolymer-based foamed lightweight soil: the mixed slurry is cured for 28 days in an environment where the temperature continuously changes within the range of 30±20°C and the relative humidity continuously changes within the range of 52-80%, thereby obtaining the novel geopolymer-based foamed lightweight soil.

[0098] Comparative Example

[0099] Comparative Example 1

[0100] The only difference between this comparative example and Example 1 is that the gasified slag with a particle size of 100-300 μm is replaced by an equal amount of alkaline slag with a particle size of 100-300 μm.

[0101] Comparative Example 2

[0102] The difference between this comparative example and Example 1 is that the iron tailings mud is replaced by an equal amount of calcium carbonate.

[0103] Comparative Example 3

[0104] The difference between this comparative example and Example 1 is that the paraffin wax is replaced by an equal amount of blast furnace slag powder.

[0105] Comparative Example 4

[0106] The difference between this comparative example and Example 1 is that the polycarboxylate water reducer is replaced by an equal amount of blast furnace slag powder.

[0107] Comparative Example 5

[0108] The difference between this comparative example and Example 1 is that in the preparation process of the novel geopolymer-based foamed lightweight soil: the mixed slurry is cured for 28 days in an environment where the temperature continuously changes within the range of 30±25°C and the relative humidity continuously changes within the range of 47-85%, thereby obtaining the novel geopolymer-based foamed lightweight soil.

[0109] Performance testing

[0110] The following performance tests were performed on the geopolymer-based foamed lightweight soils prepared in Examples 1-28 and Comparative Examples 1-5:

[0111] The geopolymer-based foamed lightweight soil was made into samples with a size of 100mm×100mm×100mm, and the absolute dry density and 28-day compressive strength of the samples were measured in accordance with JG / T 266-2011 "Foamed Concrete".

[0112] The test results are shown in Table 1.

[0113] Table 1

[0114]

[0115]

[0116] Combining Example 1 and Comparative Examples 1-5 and Table 1, it can be seen that compared with Example 1, the absolute dry density of Comparative Examples 1-5 is significantly increased, and the 28d compressive strength is significantly reduced. This shows that under the raw material ratio and process conditions of Example 1, it is helpful to improve the curing effect of geopolymer-based foamed lightweight soil in a curing environment with a wide temperature range and a wide humidity range, and a lightweight and high-strength geopolymer-based foamed lightweight soil can be obtained.

[0117] It can be seen from Examples 1-25 and Table 1 that the absolute dry density of Examples 1-25 is less than 520 kg / m3, and the 28d compressive strength is greater than 1.9 MPa. This shows that the raw material ratios of Examples 1-21 are helpful to improve the adaptability of geopolymer-based foamed lightweight soil to curing temperature and humidity, and lightweight and high-strength geopolymer-based foamed lightweight soil can be obtained.

[0118] Combining Examples 1, 26-28 and Comparative Example 5 and Table 1, it can be seen that the absolute dry density of Comparative Example 5 is the largest, and the 28d compressive strength is the smallest. This shows that the present application can obtain lightweight, high-strength geopolymer-based foamed lightweight soil in a curing environment with a temperature of 30±20°C and a relative humidity in the range of 52-80%.

[0119] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A novel geopolymer-based foamed lightweight soil, characterized in that: The invention comprises the following raw materials in parts by weight: 45-65 parts of blast furnace slag powder, 30-50 parts of gasified slag, 15-25 parts of iron tailings mud, 4-8 parts of silica fume, 2-8 parts of phase change material, 1-6 parts of surfactant, 0.5-1 parts of foaming agent and 1-4 parts of polycarboxylic acid water reducer.

2. A novel geopolymer-based foamed lightweight soil according to claim 1, characterized in that: The surfactant is a mixture of fatty acid polyoxyethylene ester and sodium oleate in a weight ratio of 1:(0.6-2).

3. The novel geopolymer-based foamed lightweight soil according to claim 1, characterized in that: The phase change material includes at least one of stearic acid, palmitic acid and paraffin.

4. The novel geopolymer-based foamed lightweight soil according to claim 3, characterized in that: The phase change material is a mixture of palmitic acid, paraffin and desulfurized gypsum in a weight ratio of 1:(2-6):(5-10).

5. The novel geopolymer-based foamed lightweight soil according to claim 1, characterized in that: The novel geopolymer-based foamed lightweight soil also includes polysiloxane.

6. The novel geopolymer-based foamed lightweight soil according to claim 5, characterized in that: The foaming agent is azodicarbonamide.

7. The novel geopolymer-based foamed lightweight soil according to claim 1, characterized in that: The novel geopolymer-based foamed lightweight soil also includes at least one of silicate, clay or glass fiber.

8. The novel geopolymer-based foamed lightweight soil according to claim 1, characterized in that: The particle size of the gasified slag is 100-600 μm.

9. A process for preparing the novel geopolymer-based foamed lightweight soil according to any one of claims 1 to 8, characterized in that: The steps include: The blast furnace slag powder, gasified slag, iron tailings mud, phase change material and water are uniformly mixed to obtain slurry A; Mix silica fume, surfactant, foaming agent and water uniformly to obtain slurry B; Mix slurry A and slurry B evenly to obtain a mixed slurry; The mixed slurry is cured in an environment with a temperature of 30±20° C. and a relative humidity of 52-80% to obtain a novel geopolymer-based foamed lightweight soil.

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