Additive suitable for ultra-light EPS concrete, ultra-light concrete and preparation method of ultra-light EPS concrete

Abstract

The invention discloses an additive suitable for ultra-light EPS concrete, ultra-light concrete and a preparation method thereof, and belongs to the technical field of concrete. The additive provided by the invention is prepared from 20-40 parts of PVA, 3-5 parts of a surfactant, 5-10 parts of a dispersant and 800-1000 parts of water. According to the prepared additive, on one hand, EPS particles and cement powder in ultra-light EPS concrete can be greatly better bonded together, the connecting tightness degree of an interface is enhanced, the EPS particles are distributed more uniformly, on the other hand, the dry density of the concrete can be greatly reduced, the mechanical property of the EPS concrete is improved, and the service life of the concrete is prolonged. Meanwhile, the concrete can also be endowed with excellent thermal insulation performance.

Description

Technical Field

[0001] The present application belongs to the field of concrete technology, and in particular relates to an additive suitable for ultra-light EPS concrete, ultra-light concrete and a preparation method thereof. Background Art

[0002] Conventional concrete is widely used due to its abundant raw materials, high compressive strength, and economical durability. However, its heavy weight significantly increases the cross-sectional dimensions of the structure, significantly increasing construction costs and making it difficult to meet the rapid and efficient development of the construction industry. This has led to the emergence of lightweight, high-strength concrete. Expanded polystyrene (EPS) concrete is an organic-inorganic composite insulation material developed based on composite material principles. It uses millimeter-sized EPS spheres as a lightweight aggregate and high-performance cement as a binder. This concrete combines lightweight, high specific strength, and low thermal conductivity, offering broad potential for development and application in the future of building energy conservation.

[0003] However, the existing concrete preparation process suffers from a weak interface between EPS particles and cementitious powders. Because EPS particles are hydrophobic and cementitious materials are hydrophilic, the difference in their properties results in a loose bond. Ultimately, the overall strength of ultra-light EPS concrete is relatively low, severely limiting its application. Therefore, maintaining the strength of EPS concrete while reducing its density is an urgent issue. Summary of the Invention

[0004] The present application discloses an additive for ultra-light EPS concrete, ultra-light concrete and a preparation method thereof, aiming to solve the technical problems of heavy weight, low strength and poor thermal conductivity of EPS concrete made with existing additives.

[0005] In order to achieve the above objectives, the technical solution of this application is:

[0006] The first aspect of the present application provides an additive suitable for ultra-light EPS concrete, comprising the following components and contents in parts by weight: 20-40 parts of PVA, 3-5 parts of surfactant, 5-10 parts of dispersant, and 800-1000 parts of water.

[0007] In combination with the first aspect, preferably, the PVA is polyvinyl alcohol powder with a powder particle size of 125 μm, a melting point of 230-240° C., and a flash point of 79° C.

[0008] In combination with the first aspect, preferably, the surfactant is one or more of lauryl betaine, cocamidopropyl betaine and sodium cocoyl glutamate; and the HLB value is 9-10.

[0009] In combination with the first aspect, preferably, the dispersant is one or more of lignin sulfonate, polycarboxylate water reducer and acrylate.

[0010] The second aspect of the present application provides a preparation method for the ultra-light EPS concrete additive according to the first aspect, the preparation method comprising:

[0011] After PVA, a surfactant and a dispersant are dissolved in water, the mixture is heated at 55-75° C. to react, thereby obtaining the additive suitable for ultra-light EPS concrete.

[0012] The third aspect of the present application provides an ultra-light EPS concrete, comprising the following components and contents in parts by weight: 100-450 parts of Portland cement, 0-200 parts of fly ash, 60-250 parts of water, 12-20 parts of EPS particles, and 5-20 parts of the additive suitable for ultra-light EPS concrete described in the first aspect.

[0013] In combination with the third aspect, preferably, the silicate cement is PO 52.5R cement with a specific surface area of 340-370m 2 / kg.

[0014] In combination with the third aspect, preferably, the fly ash is first-grade fly ash with a specific surface area of 370-400m 2 / kg.

[0015] In combination with the third aspect, preferably, the particle size of the EPS particles is 0.5-5 mm.

[0016] The fourth aspect of the present application provides a method for preparing the ultra-light EPS concrete according to the third aspect, the preparation method comprising:

[0017] The additive suitable for ultra-light EPS concrete and EPS particles are uniformly mixed to obtain a mixture;

[0018] The mixture, silicate cement, fly ash and water are mixed at room temperature, the molds are removed after forming, and the concrete is cured in water at a constant temperature to obtain ultra-light EPS concrete.

[0019] Compared with the prior art, the advantages or beneficial effects of the embodiments of the present application include at least:

[0020] The additive provided in this application is made of PVA, a surfactant, a dispersant, and water. It can significantly improve the bonding between EPS particles and cement powder in ultra-light EPS concrete, enhancing the interface connection and making the EPS particles more evenly distributed. It can also significantly reduce the dry density of concrete, improve the mechanical properties of EPS concrete, and impart excellent thermal insulation properties to the concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some of the embodiments described in this application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0022] Figure 1 This is a schematic diagram of the structure of the ultra-light EPS concrete provided in the embodiments of this application. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] In the following description of this embodiment, the term "and / or" is used to describe the association relationship between associated objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, B exists alone, and both A and B exist. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0025] In the following description of this embodiment, the term "at least one" refers to one or more, and "plurality" refers to two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0026] Those skilled in the art should understand that in the following description of the embodiments of the present application, the order of serial numbers does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0027] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0028] It should be noted that all raw materials and reagents in the examples of the present application were purchased on the market or prepared according to conventional methods well known to those skilled in the art.

[0029] In a first aspect, an embodiment of the present application provides an additive suitable for ultra-light EPS concrete, comprising the following components and contents in parts by weight: 20-40 parts of PVA, 3-5 parts of surfactant, 5-10 parts of dispersant, and 800-1000 parts of water.

[0030] Among them, on the one hand, it can greatly improve the bonding between EPS particles and cement powder in ultra-light EPS concrete, enhance the connection tightness of the interface, and make the EPS particles more evenly distributed. On the other hand, it can also greatly reduce the dry density of concrete and improve the mechanical properties of EPS concrete. At the same time, it can also give concrete excellent thermal insulation properties.

[0031] In the embodiment of the present application, the PVA is polyvinyl alcohol powder with a powder particle size of 125 μm, a melting point of 230-240°C, and a flash point of 79°C. The surfactant is preferably one or more of lauryl betaine, cocamidopropyl betaine, and sodium cocoyl glutamate; and the HLB value is 9-10. The dispersant is preferably one or more of lignin sulfonate, polycarboxylic acid water reducer, and acrylate. Among them, polyvinyl alcohol can be used as a film adhesive material to enhance the strength of the interface between EPS particles and cement particles, and can also be used as a surfactant to enhance adhesion. Surfactants have the effect of reducing surface tension, which can enable the adhesive to better wet the surface of the bonded material, improve the spreadability and permeability of the adhesive to the substrate, and thus enhance the bonding effect. Dispersants can reduce the amount of water used in the adhesive, reduce the water-cement ratio, improve the density and strength of the adhesive, and improve the bonding performance while maintaining the working properties of the adhesive (such as fluidity, plasticity, etc.). Through the synergistic effect of the three, ultra-light EPS concrete is given the characteristics of lightness and heat preservation, while maintaining excellent compressive strength to meet the multiple needs of actual engineering applications.

[0032] The second aspect of the present application provides a preparation method for the ultra-light EPS concrete additive according to the first aspect, the preparation method comprising:

[0033] After PVA, a surfactant and a dispersant are dissolved in water, the mixture is heated at 55-75° C. to react, thereby obtaining the additive suitable for ultra-light EPS concrete.

[0034] In the examples of the present application, conducting the reaction under heating conditions helps, on the one hand, increase the dissolution rate of the powder. Upon heating, the movement of water molecules intensifies, promoting interaction with the powder molecules and thus accelerating the dissolution process. Furthermore, by adding an appropriate amount of water and heating the solution, uniform dissolution is ensured, resulting in a high-quality, homogeneous solution and, ultimately, a stable solution system with excellent performance.

[0035] The third aspect of the present application provides an ultra-light EPS concrete, comprising the following components and contents in parts by weight: 100-450 parts of Portland cement, 0-200 parts of fly ash, 60-250 parts of water, 12-20 parts of EPS particles, and 5-20 parts of the additive suitable for ultra-light EPS concrete described in the first aspect.

[0036] In the embodiment of the present application, the silicate cement is preferably PO 52.5R cement, with a specific surface area of 340-370m 2 / kg. The mass fraction of CaO in the Portland cement is preferably 60% to 69%, the mass fraction of SiO2 is preferably 15% to 19%, the mass fraction of Al2O3 is preferably 3% to 4%, the mass fraction of Fe2O3 is preferably 4% to 4.5%, and the mass fractions of other materials are preferably 3.5% to 21%. The hydration products of Portland cement and water can form a dense structure within the concrete, preventing the intrusion of harmful external media (such as moisture and corrosive ions).

[0037] In the embodiment of the present application, the fly ash is preferably first-grade fly ash with a specific surface area of 370-400m 2 / kg. The mass fraction of SiO2 in fly ash is preferably 95%-97%, the mass fraction of CaO is preferably 0.5%-1%, the mass fraction of SO3 is preferably 0.9%-1%, and the mass fractions of other materials are preferably 1%-3.6%. As an excellent mineral admixture, fly ash's morphology and micro-aggregate effect effectively fill the aggregate transition zone and enhance its strength.

[0038] In the embodiments of the present application, the EPS particles preferably have a particle size of 0.5-5 mm. By controlling the particle size range of the EPS particles, a lightweight effect is achieved. Smaller EPS particles help reduce the volumetric weight of concrete, while larger particles can maintain a certain strength and stability. Therefore, when the EPS particle size range is controlled within 0.5-5 mm, relatively uniform gaps are formed between the particles, which can improve the thermal insulation performance of the concrete.

[0039] The fourth aspect of the present application provides a method for preparing the ultra-light EPS concrete according to the third aspect, the preparation method comprising:

[0040] The additive suitable for ultra-light EPS concrete and EPS particles are uniformly mixed to obtain a mixture;

[0041] The mixture, silicate cement, fly ash and water are mixed at room temperature, the molds are removed after forming, and the concrete is cured in water at a constant temperature to obtain ultra-light EPS concrete.

[0042] It should be noted that the present application evenly wraps the additives on the outside of the EPS particles, and then mixes them with silicate cement and fly ash for reaction. This can greatly improve the bonding between the EPS particles and cement powder in the ultra-light EPS concrete, thereby enhancing the tightness of the interface connection. It can also make the EPS particles more evenly distributed, significantly reduce the dry density of the concrete, and improve the mechanical properties of the EPS concrete. At the same time, it can also give the concrete excellent thermal insulation properties.

[0043] The technical solution of the present application will be further described below in conjunction with specific embodiments.

[0044] Example 1

[0045] This embodiment provides a method for preparing A1-ultra-light EPS concrete, which specifically includes:

[0046] Weigh 20 parts of polyvinyl alcohol powder, 3 parts of lauryl betaine, and 5 parts of lignin sulfonate, add them into 800 parts of water, mix and stir, and heat at 55° C. to react to obtain A1-additive.

[0047] Weigh 278 parts of Portland cement, 69 parts of fly ash, 158 parts of water, 15 parts of EPS particles, and 15 parts of A1-additive by mass, mix the EPS particles evenly, add the additive to obtain EPS particles with the additive on the surface, then add Portland cement to coat the EPS particles with the additive and stir evenly, and finally add water and stir to obtain A1-ultra-light EPS concrete.

[0048] Example 2

[0049] This embodiment provides a method for preparing A2-ultra-light EPS concrete, which specifically includes:

[0050] 30 parts of polyvinyl alcohol powder, 4 parts of lauryl betaine, and 6 parts of lignin sulfonate were weighed and added into 900 parts of water, mixed and stirred, and heated at 55° C. for reaction to obtain A2-additive.

[0051] 278 parts of Portland cement, 69 parts of fly ash, 158 parts of water, 15 parts of EPS particles, and 15 parts of A2-additive were weighed by mass, the EPS particles were evenly mixed and the additive was added to obtain EPS particles with the additive on the surface, then Portland cement was added to coat the EPS particles with the additive and stirred evenly, and finally water was added and stirred to obtain A2-ultra-light EPS concrete.

[0052] Example 3

[0053] This embodiment provides a method for preparing A3-ultra-light EPS concrete, which specifically includes:

[0054] 40 parts of polyvinyl alcohol powder, 5 parts of lauryl betaine, and 10 parts of lignin sulfonate were weighed and added into 1000 parts of water, mixed and stirred, and heated at 55° C. for reaction to obtain A3-additive.

[0055] Weigh 278 parts of Portland cement, 69 parts of fly ash, 158 parts of water, 15 parts of EPS particles, and 15 parts of A3-additive by mass, mix the EPS particles evenly, add the additive to obtain EPS particles with additives on the surface, then add Portland cement to coat the EPS particles with additives and stir evenly, and finally add water and stir to obtain A3-ultra-light EPS concrete.

[0056] Example 4

[0057] This embodiment provides a method for preparing A4-ultralight EPS concrete, which specifically includes:

[0058] Weigh 260 parts of Portland cement, 0 parts of fly ash, 125 parts of water, 17 parts of EPS particles, and 5 parts of A2-additive by mass, mix the EPS particles evenly and add the additive to obtain EPS particles with additives on the surface, then add Portland cement to coat the EPS particles with additives and stir evenly, and finally add water and stir to obtain A4-ultra-light EPS concrete.

[0059] Example 5

[0060] This embodiment provides a method for preparing A5-ultra-light EPS concrete, which specifically includes:

[0061] Weigh 260 parts of Portland cement, 0 parts of fly ash, 113 parts of water, 17 parts of EPS particles, and 17 parts of A2-additive by mass, mix the EPS particles evenly and add the additive to obtain EPS particles with additives on the surface, then add Portland cement to coat the EPS particles with additives and stir evenly, and finally add water and stir to obtain A5-ultra-light EPS concrete.

[0062] Example 6

[0063] This embodiment provides a method for preparing A6-ultra-light EPS concrete, which specifically includes:

[0064] Weigh 260 parts of Portland cement, 0 parts of fly ash, 110 parts of water, 17 parts of EPS particles, and 20 parts of A2-additive by mass, mix the EPS particles evenly and add the additive to obtain EPS particles with additives on the surface, then add Portland cement to coat the EPS particles with additives and stir evenly, and finally add water and stir to obtain A6-ultra-light EPS concrete.

[0065] Example 7

[0066] This embodiment provides a method for preparing A7-ultralight EPS concrete, which specifically includes:

[0067] Weigh 347 parts of Portland cement, 0 parts of fly ash, 158 parts of water, 15 parts of EPS particles, and 5 parts of A2-additive by mass, mix the EPS particles evenly and add the additive to obtain EPS particles with the additive on the surface, then add Portland cement to coat the EPS particles with the additive and stir evenly, and finally add water and stir to obtain A7-ultra-light EPS concrete.

[0068] Example 8

[0069] This embodiment provides a method for preparing A8-ultra-light EPS concrete, which specifically includes:

[0070] Weigh 278 parts of Portland cement, 69 parts of fly ash, 158 parts of water, 15 parts of EPS particles, and 15 parts of A2-additive by mass, mix the EPS particles evenly and add the additive to obtain EPS particles with the additive on the surface, then add Portland cement to coat the EPS particles with the additive and stir evenly, and finally add water and stir to obtain A8-ultra-light EPS concrete.

[0071] Example 9

[0072] This embodiment provides a method for preparing A9-ultralight EPS concrete, which specifically includes:

[0073] Weigh 278 parts of Portland cement, 69 parts of fly ash, 158 parts of water, 15 parts of EPS particles, and 20 parts of A2-additive by mass, mix the EPS particles evenly and add the additive to obtain EPS particles with additives on the surface, then add Portland cement to coat the EPS particles with additives and stir evenly, and finally add water and stir to obtain A9-ultra-light EPS concrete.

[0074] Example 10

[0075] This embodiment provides a method for preparing A10-ultralight EPS concrete, which specifically includes:

[0076] Weigh 278 parts of Portland cement, 69 parts of fly ash, 158 parts of water, 15 parts of EPS particles, and 20 parts of A2-additive by mass, mix the EPS particles evenly and add the additive to obtain EPS particles with the additive on the surface, then add Portland cement to coat the EPS particles with the additive and stir evenly, and finally add water and stir to obtain A10-ultra-light EPS concrete.

[0077] Example 11

[0078] This embodiment provides a method for preparing A11-ultra-light EPS concrete, which specifically includes:

[0079] Weigh 433 parts of Portland cement, 0 part of fly ash, 203 parts of water, 14 parts of EPS particles, and 16 parts of A2-additive by mass, mix the EPS particles evenly and add the additive to obtain EPS particles with the additive on the surface, then add Portland cement to coat the EPS particles with the additive and stir evenly, and finally add water and stir to obtain A11-ultra-light EPS concrete.

[0080] Example 12

[0081] This embodiment provides a method for preparing A12-ultra-light EPS concrete, which specifically includes:

[0082] Weigh 433 parts of Portland cement, 0 part of fly ash, 203 parts of water, 14 parts of EPS particles, and 20 parts of A2-additive by mass, mix the EPS particles evenly and add the additive to obtain EPS particles with the additive on the surface, then add Portland cement to coat the EPS particles with the additive and stir evenly, and finally add water and stir to obtain A12-ultra-light EPS concrete.

[0083] At the same time, in order to verify the comprehensive performance of the ultra-light EPS concrete prepared in the above examples, this application provides the following comparative examples for detailed description.

[0084] Comparative Example 1

[0085] This comparative example provides a preparation method of B1-additive. The component ratio, preparation operation and process parameters are basically the same as those in Example 1, except that no lauryl betaine is added in this comparative example to obtain B1-additive.

[0086] Comparative Example 2

[0087] This comparative example provides a preparation method of B2-additive. The component ratio, preparation operation and process parameters are basically the same as those in Example 1, except that lignin sulfonate is not added in this comparative example to obtain B2-additive.

[0088] Comparative Example 3

[0089] This comparative example provides a preparation method for B1-EPS concrete. The component ratio, preparation operation, and process parameters are basically the same as those in Example 4, except that B1-additive is added in this comparative example to obtain B1-EPS concrete.

[0090] Comparative Example 4

[0091] This comparative example provides a preparation method for B1-EPS concrete. The component ratio, preparation operation, and process parameters are basically the same as those in Example 4, except that B2-additive is added in this comparative example to obtain B2-EPS concrete.

[0092] Comparative Example 5

[0093] This comparative example provides a preparation method for B1-EPS concrete. The component ratio, preparation operation, and process parameters are basically the same as those in Example 4, except that the A2-additive is not added in this comparative example, and B3-EPS concrete is obtained.

[0094] Comparative Example 6

[0095] This comparative example provides a preparation method for B2-EPS concrete. The component ratio, preparation operation, and process parameters are basically the same as those in Example 4, except that 25 parts of A2-additive are added in this comparative example to obtain B4-EPS concrete.

[0096] The physical properties of the ultra-light EPS concrete prepared in Examples 4-12 were tested according to GB / T 50081-2019 "Standard for Test Methods for Physical and Mechanical Properties of Concrete", and the thermal conductivity was tested according to GB / T 10294-2008 "Determination of Steady-State Thermal Resistance and Related Properties of Insulating Materials - Guarded Hot Plate Method". The test results are shown in Table 1.

[0097] Table 1 Performance test results of ultralight EPS concrete prepared in Examples 1-12

[0098]

[0099]

[0100] Table 2 Performance test results of concrete made from comparative examples 3-6

[0101]

[0102] A comparison of Examples 1, 2, and 3 reveals that the addition of the A2 additive significantly improves the compressive and flexural strengths and thermal conductivity of ultra-light EPS concrete. Therefore, all subsequent examples utilize the A2 additive. Examples 4, 5, and 6, as well as Comparative Examples 5 and 6, reveal that the addition of an appropriate amount of the additive significantly improves the compressive strength of ultra-light EPS concrete, while the improvement in flexural strength is less pronounced. Excessive amounts of the additive produce strengths that are essentially the same as those without the additive, indicating that neither excessive nor no additives improve the strength of ultra-light EPS concrete. Example 1 and Comparative Examples 3 and 4 reveal that all additives are essential; the lack of any one reduces the compressive strength. Furthermore, a comparison of the examples reveals that the strength and thermal conductivity of ultra-light EPS concrete decrease with decreasing dry density, demonstrating excellent thermal insulation properties.

[0103] Therefore, the additive provided in this application is made of PVA, a surfactant, a dispersant, and water. This additive can greatly improve the bonding between EPS particles and cement powder in ultra-light EPS concrete, enhance the tightness of the interface connection, and evenly distribute EPS particles, significantly reducing the dry density of concrete, and improving the mechanical properties of EPS concrete. At the same time, it can also give the concrete excellent thermal insulation properties.

[0104] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0105] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. An additive suitable for ultra-light EPS concrete, characterized in that: The invention comprises the following components and their contents in parts by weight: 20-40 parts of PVA, 3-5 parts of surfactant, 5-10 parts of dispersant and 800-1000 parts of water.

2. The ultra-light EPS concrete additive according to claim 1, characterized in that: The PVA is polyvinyl alcohol powder with a particle size of 125 μm, a melting point of 230-240° C., and a flash point of 79° C.

3. The additive for ultra-light EPS concrete according to claim 1, characterized in that: The surfactant is one or more of lauryl betaine, cocamidopropyl betaine and sodium cocoyl glutamate; and the HLB value is 9-10.

4. The additive for ultra-light EPS concrete according to claim 1, characterized in that: The dispersant is one or more of lignin sulfonate, polycarboxylic acid water reducer and acrylate.

5. A method for preparing the ultra-light EPS concrete additive according to claim 1, characterized in that: The preparation method comprises: After PVA, a surfactant and a dispersant are dissolved in water, the mixture is heated at 55-75° C. to react, thereby obtaining the additive suitable for ultra-light EPS concrete.

6. An ultra-light EPS concrete, characterized in that: The concrete comprises the following components and their contents by weight: 100-450 parts of Portland cement, 0-200 parts of fly ash, 60-250 parts of water, 12-20 parts of EPS particles and 5-20 parts of the additive suitable for ultra-light EPS concrete according to claim 1.

7. The ultra-light EPS concrete according to claim 6, characterized in that: The silicate cement is PO 52.5R cement with a specific surface area of 340-370m 2 / kg.

8. The ultra-light EPS concrete according to claim 6, characterized in that: The fly ash is first-grade fly ash with a specific surface area of 370-400m 2 / kg.

9. The ultra-light EPS concrete according to claim 6, characterized in that: The particle size of the EPS particles is 0.5-5 mm.

10. A method for preparing the ultra-light EPS concrete according to any one of claims 6 to 9, characterized in that: The preparation method comprises: The additive suitable for ultra-light EPS concrete and EPS particles are uniformly mixed to obtain a mixture; The mixture, silicate cement, fly ash and water are mixed at room temperature, the molds are removed after forming, and the concrete is cured in water at a constant temperature to obtain ultra-light EPS concrete.

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