Foam light soil doped with EPS (Expandable Polystyrene) particles and preparation method of foam light soil

Abstract

The invention relates to the technical field of light soil, and mainly relates to foam light soil doped with EPS (Expandable Polystyrene) particles and a preparation method of the foam light soil. The foamed light soil is prepared from the following raw materials in parts by weight: 240 to 250 parts of cement, 70 to 80 parts of fly ash, 30 to 40 parts of mineral powder, 13 to 25 parts of foam, 1.5 to 4 parts of rubber powder, 0.9 to 3 parts of EPS (Expandable Polystyrene) particles and 150 to 160 parts of water. The foam light soil doped with the EPS particles has the advantages of being small in density, light in self weight, high in strength, adjustable in strength and good in economical efficiency, the pressure of the foam light soil doped with the EPS particles on a retaining wall can be effectively reduced, the problems of differential settlement and the like are solved, and a way is provided for solving some special engineering problems.

Description

Technical Field

[0001] This invention relates to the field of lightweight soil technology, and in particular to a foamed lightweight soil with added EPS particles and its preparation method. Background Technology

[0002] Lightweight soil, due to its light weight and high strength, has broad application prospects in soft soil foundation treatment, slope treatment, highway widening, pipeline backfilling, bridge abutment construction, and retaining wall backfilling. EPS (expanded polystyrene) is a stable, water-repellent, closed-cell ultralight particle. Concrete prepared using EPS as aggregate exhibits excellent properties such as lightweight, thermal insulation, heat insulation, large deformation, and impact resistance. In recent years, due to the demand for energy-efficient buildings and the development of high-rise buildings, EPS lightweight concrete has received attention and has been extensively studied.

[0003] In recent years, with the rapid development of highway construction, more and more problems have been encountered during construction due to different geological and geomorphological conditions. For roads located on steep mountain slopes, a series of engineering challenges exist: a. The stability of retaining walls at excavation sites. Filling excavation sites with ordinary soil would exert significant earth pressure on the retaining walls, potentially causing instability. b. The overall stability of fill sites. The slope itself is steep; if ordinary fill is used, the bond between the roadbed and the dry-laid rubble is weak. After rainfall, the increased moisture content and decreased friction coefficient make the contact surface prone to overall sliding instability. c. Uneven settlement at fill sites.

[0004] To solve the above-mentioned engineering problems, it is necessary to develop a lightweight soil that is both lightweight and strong, thereby reducing the pressure of the fill soil on the retaining wall and solving problems such as uneven settlement. Summary of the Invention

[0005] In response to some special situations in engineering, this invention provides a foamed lightweight soil with added EPS particles and its preparation method, which provides a reference for solving these problems while ensuring strength and without increasing costs.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The first aspect of the present invention provides a foamed lightweight soil with added EPS particles, comprising the following raw materials in parts by weight: 240-250 parts cement, 70-80 parts fly ash, 30-40 parts mineral powder, 13-25 parts foam, 1.5-4 parts adhesive powder, 0.9-3 parts EPS particles and 150-160 parts water.

[0008] In some embodiments of the present invention, the cement is P.O42.5 ordinary Portland cement.

[0009] In some embodiments of the present invention, the fly ash is selected from Class II fly ash.

[0010] In some embodiments of the present invention, the mineral powder is selected from S95 mineral powder.

[0011] In some embodiments of the present invention, the density of the foam is 50 kg / m³. 3 The water bleeding rate is 25%-31%, and the settling distance is 6-7mm.

[0012] In some embodiments of the present invention, the adhesive powder is selected from 801 instant adhesive powder.

[0013] In some embodiments of the present invention, the EPS particles have a diameter of 3-5 mm.

[0014] In some embodiments of the present invention, the amount of adhesive powder is 0.5%-1% of the total weight of the cementitious material; and / or, the amount of EPS particles is 0.027%-0.88% of the total weight of the cementitious material.

[0015] A second aspect of the present invention provides a method for preparing the above-mentioned foamed lightweight soil with added EPS particles, comprising the following steps:

[0016] 1) Weigh out cement, fly ash, and mineral powder according to the weight ratio, mix them evenly, and obtain dry material;

[0017] 2) Add the adhesive powder to water and stir until well mixed to obtain an adhesive powder solution;

[0018] 3) Add the adhesive powder solution to the dry material and mix well to obtain a slurry material;

[0019] 4) Add the slurry material and pre-made foam to the mixer and mix evenly. Then add EPS particles and mix evenly again to obtain foamed lightweight soil with added EPS particles.

[0020] In some embodiments of the present invention, the method for preparing the foam includes the following steps:

[0021] S1. Dilute the foaming agent with water and stir well to obtain a foaming agent solution;

[0022] S2. Start the foaming machine, insert the inlet pipe into the foaming agent solution, and insert the outlet pipe into the prepared container. After the foaming liquid has reacted completely, pull it out to obtain pre-made foam.

[0023] In some embodiments of the present invention, the mixing in step 1) is performed by stirring with a mixer for 90-120 seconds.

[0024] In some embodiments of the present invention, the mixing in step 2) is done by manual or mechanical stirring for 90-120 seconds.

[0025] In some embodiments of the present invention, the mixing in step 3) is performed by stirring with a mixer for 60-90 seconds.

[0026] In some embodiments of the present invention, the stirring and re-stirring time in step 4) is 90-120s.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. This invention incorporates EPS particles into foamed lightweight soil. Since EPS is a stable, hydrophobic, closed-cell ultralight particle, concrete prepared using EPS as aggregate exhibits excellent properties such as lightweight, thermal insulation, heat insulation, large deformation, and impact resistance. Furthermore, the addition of an appropriate amount of adhesive powder prevents EPS particles from floating during mixing, promoting their uniform distribution. The resulting foamed lightweight soil with added EPS particles exhibits uniform EPS particle distribution, possesses EPS particle characteristics compared to ordinary lightweight soil, and also has higher strength.

[0029] 2. The foamed lightweight soil with added EPS particles provided by this invention has the advantages of low density, light weight, high strength, adjustable strength, and good economy. The foamed lightweight soil with added EPS particles can effectively reduce its own pressure on retaining walls and solve problems such as uneven settlement. It provides a reference for solving some special engineering problems and has high industrial application value.

[0030] 3. In this invention, EPS particles can be made from crushed waste foam plastic, realizing the resource utilization of solid waste and having good environmental benefits. Attached Figure Description

[0031] Figure 1 This is a process flow diagram for preparing foamed lightweight soil with added EPS particles according to an embodiment of the present invention.

[0032] Figure 2 The graph shows the trend of compressive strength of foamed lightweight soil with added EPS particles as a function of the amount of adhesive powder.

[0033] Figure 3 The graph shows the trend of water absorption rate of foamed lightweight soil with added EPS particles as a function of the amount of adhesive powder.

[0034] Figure 4 The graph shows the trend of wet weight and dry density of foamed lightweight soil with added EPS particles as a function of the amount of adhesive powder. Detailed Implementation

[0035] The following details the foamed lightweight soil with added EPS particles and its preparation method according to the present invention.

[0036] The inventors of this invention used EPS particles as aggregates and cement, fly ash, and mineral powder as binders. By adding binder powder, they promoted the uniform distribution of EPS particles in the mixture, thus preparing foamed lightweight soil with added EPS particles. This invention ensures the strength of the foamed lightweight soil without increasing costs.

[0037] The first aspect of the present invention provides a foamed lightweight soil with added EPS particles, comprising the following raw materials in parts by weight: 240-250 parts cement, 70-80 parts fly ash, 30-40 parts mineral powder, 13-25 parts foam, 1.5-4 parts adhesive powder, 0.9-3 parts EPS particles and 150-160 parts water.

[0038] Expanded polystyrene (EPS) is a lightweight polymer foam plastic produced by mixing polystyrene resin with a foaming agent and softening it to generate gas through technical means. It features strong thermal insulation, light weight, low water absorption, and high strength. The foamed lightweight soil with added EPS particles provided by this invention is composed of gel material, EPS particles, and water. It not only maintains the lightweight nature of EPS foam but also adds an appropriate proportion of adhesive powder to promote the uniform distribution of EPS particles, giving the foamed lightweight soil high strength. This can solve a series of problems encountered in highway construction due to steep slopes and effectively reduce its pressure on retaining walls, addressing issues such as uneven settlement.

[0039] In some embodiments of the present invention, the gelling material is cement, fly ash, mineral powder, and adhesive powder, wherein the amount of adhesive powder is 0.5%-1% of the total weight of the cementitious material. Within this preferred ratio range, the resulting foamed lightweight soil with added EPS particles exhibits good comprehensive performance.

[0040] In some embodiments of the present invention, the gelling material is cement, fly ash, mineral powder and adhesive powder, and the amount of EPS particles is 0.027%-0.88% of the total weight of the cementitious material. Specifically, the amount of EPS particles can be adjusted according to the requirements of strength, wet weight and flow value.

[0041] In this invention, cement is used as a cementitious material. There are no special restrictions on the type of cement, as long as it can achieve the corresponding function. In some embodiments of this invention, the cement is selected from P.O42.5 ordinary Portland cement. PO represents ordinary cement, and 42.5 represents the cement strength.

[0042] The source of fly ash in this invention is not limited, but is preferably flue ash discharged from power plant boilers, with SiO2 and Al2O3 as its main components. In some embodiments of this invention, the fly ash is selected from Class II fly ash.

[0043] In this invention, the mineral powder, also known as slag micron powder or granulated blast furnace slag powder, is mainly used as a concrete admixture, added to concrete during its preparation. According to the national standard GB / T18046-2000, mineral powder is classified into three grades: S105, S95, and S75. In some embodiments of this invention, the mineral powder is selected from S95 grade mineral powder, which meets performance requirements and is relatively economical.

[0044] The foam described in this invention is prepared by diluting a foaming agent with water using a foaming machine. The foaming agent is selected from composite foaming agents, such as composite foaming agents containing rosin resin, plant protein, etc.

[0045] In some embodiments of the present invention, the density of the foam is 50 kg / m³. 3 The water bleeding rate is 25%-31%, and the settling distance is 6-7mm.

[0046] The adhesive powder used in this invention is selected from 801 quick-dissolving adhesive powder, which can be quickly dispersed and dissolved in cold water, thereby improving the bonding strength of different substrates.

[0047] In this invention, the EPS particles can be either expanded polystyrene spheres or crushed waste foam plastic particles, achieving the effect of waste utilization. In some embodiments of this invention, the EPS particles have a diameter of 3-5 mm, which can be 3-4 mm or 4-5 mm.

[0048] In some embodiments of the present invention, the water is industrial water or tap water.

[0049] A second aspect of the present invention provides a method for preparing the above-mentioned foamed lightweight soil with added EPS particles, comprising the following steps:

[0050] 1) Weigh out cement, fly ash, and mineral powder according to the weight ratio, mix them evenly, and obtain dry material;

[0051] 2) Add the adhesive powder to water and stir until well mixed to obtain an adhesive powder solution;

[0052] 3) Add the adhesive powder solution to the dry material and mix well to obtain a slurry material;

[0053] 4) Add the slurry material and pre-made foam to the mixer and mix evenly. Then add EPS particles and mix evenly again to obtain foamed lightweight soil with added EPS particles.

[0054] The present invention provides a method for preparing foamed lightweight soil with added EPS particles. First, a slurry is prepared by mixing a slurry solution with dry materials. Then, this slurry is mixed with pre-made foam to form a mixture. EPS particles are then added to the mixture. Because the slurry increases the binding force of the mixture, it overcomes the problem in existing processes where EPS particles, due to their light weight and weak binding force, float during stirring, leading to uneven distribution. This method achieves uniform distribution of EPS particles in the foamed lightweight soil, improving its overall performance. Steps 1) and 2) are not sequential; performing either step 1) or step 2) first is within the scope of this invention. Steps 1) and 2) can also be performed simultaneously.

[0055] In some embodiments of the present invention, the method for preparing the foam includes the following steps:

[0056] S1. Dilute the foaming agent with water and stir well to obtain a foaming agent solution;

[0057] S2. Start the foaming machine, insert the inlet pipe into the foaming agent solution, and insert the outlet pipe into the prepared container. After the foaming liquid has reacted completely, pull it out to obtain pre-made foam.

[0058] In some embodiments of the present invention, in S1, the weight ratio of foaming agent to water is 1:30-50, which can be 1:30-35, 1:35-40, 1:40-45, or 1:45-50, preferably 1:40.

[0059] In some embodiments of the present invention, in step S1, the solution is stirred until it is clear and free of floating matter.

[0060] In some embodiments of the present invention, in S2, the foaming machine is selected from a small-sized single-unit foaming machine.

[0061] In some embodiments of the present invention, the mixing in step 1) is performed using a mixer for a mixing time of 90-120 seconds, which can be 90-95 seconds, 95-100 seconds, 100-105 seconds, 105-110 seconds, 110-115 seconds, or 115-120 seconds. This mixing method ensures that the cement, fly ash, and mineral powder are evenly dispersed, which is beneficial for their dispersion in subsequent mixing processes.

[0062] In some embodiments of the present invention, the stirring in step 2) is manual or mechanical stirring, and the stirring time is 90-120s, which can be 90-95s, 95-100s, 100-105s, 105-110s, 110-115s, or 115-120s. This stirring method ensures that the adhesive powder is evenly dispersed in the water, which is beneficial for the dispersion of the adhesive powder in subsequent mixing processes, enhances the binding force, and prevents EPS particles from floating.

[0063] In some embodiments of the present invention, after stirring evenly in step 2), the mixture is allowed to stand for 15-30 minutes, which can be 15-20 minutes, 20-25 minutes, or 25-30 minutes, but preferably 20 minutes.

[0064] In some embodiments of the present invention, the mixing in step 3) is performed using a mixer for a mixing time of 60-90 seconds, which can be 60-65 seconds, 65-70 seconds, 70-75 seconds, 75-80 seconds, 80-85 seconds, or 85-90 seconds. This mixing method promotes the uniform distribution of the adhesive powder solution and dry materials, improving the homogeneity of the foamed lightweight soil.

[0065] In some embodiments of the present invention, the stirring and re-stirring time in step 4) is 90-120s, which can be 90-95s, 95-100s, 100-105s, 105-110s, 110-115s, or 115-120s.

[0066] The following detailed description of specific embodiments of the present invention, in conjunction with preferred embodiments, further illustrates the relevant details. When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in the present invention, both endpoints of each numerical range, as well as any value between the two endpoints, may be selected. Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by those skilled in the art. In addition to the specific methods, devices, and materials used in the embodiments, the present invention can be implemented using any prior art methods, devices, and materials similar to or equivalent to those described in the embodiments of the present invention, provided that those skilled in the art possess the prior art and the description of the present invention.

[0067] The components, raw materials, and related parameters used in the following examples and comparative examples are as follows:

[0068] P.O42.5 ordinary Portland cement, provided by Taicang Conch Cement Co., Ltd.

[0069] Grade II fly ash, with a particle size of 0-3mm, is taken from the flue ash discharged from a power plant boiler. Grade F fly ash is formed by coal calcination and its main components are SiO2 and Al2O3.

[0070] S95 mineral powder, with a density of not less than 2.8 g / cm³. 3 Specific surface area not less than 350m² 2 / kg, 28d activity index not less than 95%, provided by Baotian New Building Materials Co., Ltd.

[0071] EPS particles are expanded polystyrene particles with a diameter of 3-5mm.

[0072] Adhesive powder, model number 801, provided by Henan Lebang Building Materials Technology Co., Ltd.

[0073] Composite foaming agent, produced by Tuoxin Machinery Co., Ltd.

[0074] Water, tap water.

[0075] Example 1

[0076] The foamed lightweight soil in this embodiment with added EPS particles includes the following raw materials by weight: 248.4 parts cement, 36 parts mineral powder, 72 parts fly ash, 154.8 parts water, 3.6 parts adhesive powder, 2.85 parts EPS, and 13 parts foam.

[0077] The preparation method of the above-mentioned foamed lightweight soil with added EPS particles includes the following steps:

[0078] 1) Take the cement, mineral powder and fly ash according to the weight ratio, pour them into the mixer, start the mixer and mix for 2 minutes until they are evenly mixed to obtain dry material;

[0079] 2) Pour the adhesive powder into a bucket filled with water, stir it evenly with a hand-held stirring stick or other tools, and let it stand for 20 minutes to obtain an adhesive powder solution;

[0080] 3) Pour the adhesive powder solution into the mixer and mix it with the dry materials for 1 minute to obtain a slurry.

[0081] 4) Dilute the weighed foaming agent in water at a dilution ratio of 1:40 and stir until the solution is clear and free of floating matter; start the foaming machine, insert the inlet pipe into the prepared foaming agent solution, and insert the outlet pipe into the prepared water bucket. After the foaming liquid has reacted completely, pull it out. (The foam at the beginning and end should be discarded to prevent uneven density) to obtain pre-made foam.

[0082] 5) Take the pre-made foam according to the weight ratio and add it to the slurry material, stir evenly to obtain a mixture; then take the EPS particles according to the weight ratio and add them to the mixture, stir for 2 minutes to obtain foamed lightweight soil with added EPS particles;

[0083] 6) Measure the wet weight and flow value of the mixed EPS particle foam lightweight soil, then pour the foam lightweight soil with added EPS particles into the mold, gently vibrate it and then scrape the surface smooth. Cover it with plastic wrap and demold after 24 hours. After demolding, place it in a standard curing box for curing. Test its compressive strength and flexural strength after 7 days and 28 days of curing, respectively.

[0084] Example 2

[0085] The foamed lightweight soil in this embodiment with added EPS particles includes the following raw materials by weight: 248.4 parts cement, 36 parts mineral powder, 72 parts fly ash, 154.8 parts water, 3.6 parts adhesive powder, 2.85 parts EPS, and 15 parts foam.

[0086] The preparation method of the foamed lightweight soil with added EPS particles is the same as in Example 1.

[0087] Example 3

[0088] The foamed lightweight soil in this embodiment with added EPS particles includes the following raw materials by weight: 248.4 parts cement, 36 parts mineral powder, 72 parts fly ash, 154.8 parts water, 3.6 parts adhesive powder, 2.85 parts EPS, and 17 parts foam.

[0089] The preparation method of the foamed lightweight soil with added EPS particles is the same as in Example 1.

[0090] Example 4

[0091] The foamed lightweight soil in this embodiment with added EPS particles includes the following raw materials by weight: 248.4 parts cement, 36 parts mineral powder, 72 parts fly ash, 154.8 parts water, 3.6 parts adhesive powder, 2.85 parts EPS, and 19 parts foam.

[0092] The preparation method of the foamed lightweight soil with added EPS particles is the same as in Example 1.

[0093] Example 5

[0094] The foamed lightweight soil in this embodiment with added EPS particles includes the following raw materials by weight: 248.4 parts cement, 36 parts mineral powder, 72 parts fly ash, 154.8 parts water, 3.6 parts adhesive powder, 2.85 parts EPS, and 21 parts foam.

[0095] The preparation method of the above-mentioned foamed lightweight soil with added EPS particles is the same as that in Example 1.

[0096] Example 6

[0097] The foamed lightweight soil in this embodiment with added EPS particles includes the following raw materials by weight: 248.4 parts cement, 36 parts mineral powder, 72 parts fly ash, 154.8 parts water, 3.6 parts adhesive powder, 2.85 parts EPS, and 23 parts foam.

[0098] The preparation method of the above-mentioned foamed lightweight soil with added EPS particles is the same as that in Example 1.

[0099] Compressive strength test

[0100] The EPS particle foam lightweight soil specimens from Examples 1-6 were subjected to unconfined compressive strength tests at 7d and 28d, respectively, using a material testing machine in accordance with CJJ / T177-2012 "Technical Specification for Filling Engineering of Foam-Mixed Lightweight Soil".

[0101] Test samples of 100mm×100mm×100mm were used, and the determination was carried out in accordance with JG / T266-2011 "Foamed Concrete".

[0102] Flexural strength test

[0103] The EPS particle foam lightweight soil specimens from Examples 1-6 were subjected to flexural strength tests at 7 days and 28 days, respectively, in accordance with the "Test Method for Strength of Cement Mortar (ISO Method)" (GBT-17671-1999).

[0104] Test samples of 40mm×40mm×160mm were used, and the tests were performed in accordance with JE / T3420-2020 "Test Procedures for Cement and Cement Concrete in Highway Engineering".

[0105] The test results of Examples 1-6 are shown in Table 1.

[0106] Table 1

[0107]

[0108] As shown in Table 1, the foamed lightweight soil with added EPS particles provided in Examples 1-6 of this invention has a wet unit weight of (590-730)×10⁻⁶. -2 KN / m 3 Between 139-158mm, it can be pumped through pipelines and poured into designated areas to achieve self-leveling. It has good compressive and flexural strength and can meet construction quality requirements.

[0109] Effect of the amount of adhesive powder added

[0110] The following provides foamed lightweight clay with different amounts of added EPS particles and different amounts of adhesive powder. The mass ratio of each component raw material is shown in Table 2 below.

[0111] Table 2

[0112]

[0113] The preparation method of the foamed lightweight soil with added EPS particles, numbered D1-D5 above, is the same as in Example 1.

[0114] Compressive strength test

[0115] EPS particle foam lightweight soil specimens obtained from D1 to D5 were subjected to unconfined compressive strength tests at 7d, 14d, and 28d, respectively, using a material testing machine in accordance with CJJ / T177-2012 "Technical Specification for Filling Engineering of Foam-Mixed Lightweight Soil".

[0116] Test samples of 100mm×100mm×100mm were used, and the determination was carried out in accordance with JG / T266-2011 "Foamed Concrete".

[0117] The test results of the physical and mechanical properties of the EPS particle foam lightweight soil specimens obtained from D1 to D5 are shown in Table 3 below.

[0118] Table 3

[0119]

[0120] As shown in Table 3, the addition of adhesive powder can significantly improve the compressive strength of foamed lightweight soil, but it also greatly increases the water absorption rate, wet weight and dry density. Therefore, the selection of appropriate amount of adhesive powder has a very important impact on the performance of foamed lightweight soil. When the amount of adhesive powder is 0.5%-1% of the weight of cementitious material, the comprehensive performance of foamed lightweight soil is optimal.

[0121] Figure 2 This is a graph showing the trend of compressive strength of foamed lightweight soil with varying binder content. Figure 2 It is known that binder powder can improve the compressive strength of foamed lightweight soil. When the binder powder content is less than 1%, the compressive strength of foamed lightweight soil increases with the increase of binder powder content; when the binder powder content exceeds 1%, the compressive strength of foamed lightweight soil decreases with the increase of binder powder content. However, overall, binder powder can significantly improve the compressive strength of foamed lightweight soil. This is because the cementitious material can undergo a hydration reaction with the binder powder, which will encapsulate the reaction products, making the structure of the specimen more compact after setting, thus increasing the compressive strength compared to when no binder powder is added.

[0122] Figure 3The graph shows the trend of water absorption rate of foamed lightweight soil as a function of adhesive powder content. As can be seen from the graph, the water absorption rate of foamed lightweight soil increases significantly with the increase of adhesive powder content. When the adhesive powder content is 2%, the water absorption rate reaches as high as 71.13%, which is 2.41 times that without adhesive powder. This is because the adhesive powder solution after mixing with water has strong viscosity. During the hardening process, the strong viscosity causes a large number of air bubbles inside the specimen to rupture. These ruptured air bubbles interconnect to form numerous through-holes for water seepage, thus leading to a sharp increase in the water absorption rate of the foamed lightweight soil.

[0123] Figure 4 The graph shows the trend of wet and dry density of foamed lightweight soil with varying amounts of binder powder. As can be seen from the graph, when the binder powder content is 0.5%, both the dry and wet density of the foamed lightweight soil increase significantly. With further increases in binder powder content, the wet and dry density curves decrease slightly. This is because the binder powder solution has high viscosity, and the addition of binder powder makes the air bubbles inside the foamed lightweight soil specimen more compact, resulting in more cementing material per unit volume of specimen, thus increasing the wet and dry density.

[0124] In summary, the foamed lightweight soil with EPS particles prepared by this invention has the advantages of low density, light weight, high strength, adjustable strength, and good economy. The foamed lightweight soil with EPS particles can effectively reduce its own pressure on retaining walls and solve problems such as uneven settlement. It provides a reference for solving some special engineering problems and overcomes the various shortcomings of the prior art, thus having high industrial application value.

[0125] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A foamed lightweight soil incorporating EPS particles, characterized in that, The raw materials include the following components by weight: 240-250 parts cement, 70-80 parts fly ash, 30-40 parts mineral powder, 13-25 parts foam, 1.5-4 parts adhesive powder, 0.9-3 parts EPS granules, and 150-160 parts water.

2. The foamed lightweight soil with added EPS particles as described in claim 1, characterized in that, Includes one or more of the following characteristics: (1) The cement is selected from P.O42.5 ordinary Portland cement; (2) The fly ash is selected from Class II fly ash; (3) The mineral powder is selected from S95 mineral powder; (4) The density of the foam is 50 kg / m³. 3 The water bleeding rate is 25%-31%, and the settling distance is 6-7mm; (5) The adhesive powder is selected from 801 instant adhesive powder; (6) The diameter of the EPS particles is 3-5 mm.

3. The foamed lightweight soil with added EPS particles as described in claim 1, characterized in that, Includes one or more of the following characteristics: i) The foam is prepared by diluting a foaming agent with water using a foaming machine; ii) The EPS particles are expanded polystyrene spheres or particles obtained from crushing waste foam plastic.

4. The foamed lightweight soil with added EPS particles as described in claim 3, characterized in that, The foaming agent is selected from composite foaming agents.

5. The foamed lightweight soil with added EPS particles as described in claim 1, characterized in that, The amount of adhesive powder is 0.5%-1% of the total weight of the cementitious material; and / or, the amount of EPS particles is 0.027%-0.88% of the total weight of the cementitious material.

6. A method for preparing foamed lightweight soil with added EPS particles as described in any one of claims 1-5, characterized in that, Includes the following steps: 1) Weigh out cement, fly ash, and mineral powder according to the weight ratio, mix them evenly, and obtain dry material; 2) Add the adhesive powder to water and stir until well mixed to obtain an adhesive powder solution; 3) Add the adhesive powder solution to the dry material and mix well to obtain a slurry material; 4) Add the slurry material and pre-made foam to the mixer, and add EPS particles at the same time. Mix evenly to obtain foamed lightweight soil with added EPS particles.

7. The method for preparing foamed lightweight soil with added EPS particles as described in claim 6, characterized in that, The method for preparing the foam includes the following steps: S1. Dilute the foaming agent with water and stir well to obtain a foaming agent solution; S2. Start the foaming machine, insert the inlet pipe into the foaming agent solution, and insert the outlet pipe into the prepared container. After the foaming liquid has reacted completely, pull it out to obtain pre-made foam.

8. The method for preparing foamed lightweight soil with added EPS particles as described in claim 6, characterized in that, Includes one or more of the following characteristics: (a) In S1, the weight ratio of foaming agent to water is 1:30-50; (b) In S1, stir until the solution is clear and free of floating matter; (c)S2, the foaming machine is selected from a small single-unit foaming machine.

9. The method for preparing foamed lightweight soil with added EPS particles as described in claim 5, characterized in that, Includes one or more of the following characteristics: 11) The mixing described in step 1) is performed using a mixer for 90-120 seconds; 21) The stirring described in step 2) is done manually or mechanically, and the stirring time is 90-120 seconds; 22) After stirring evenly in step 2), let it stand for 15-30 minutes; 31) The mixing described in step 3) is performed using a mixer for 60-90 seconds; 41) The stirring time in step 4) is 90-120 seconds.

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