High-performance energy-saving foam concrete and preparation method thereof

Abstract

The application discloses high-performance energy-saving foam concrete and a preparation method thereof, relates to the technical field of concrete, and comprises the following components in parts by weight: 80-100 parts of cement, 12-20 parts of filling aggregate, 1-2 parts of a foaming agent, 0.5-2 parts of a water reducing agent, 0.2-1 part of a fiber material and 30-50 parts of water; wherein, the filling aggregate is prepared by mixing and modifying fly ash, sodium alkyl sulfonate, chitosan, aluminum oxide, sodium alginate, n-propyl acetate and 4-chlorobenzoic acid. The application has the effects that the compressive strength of the foam concrete is remarkably improved, the distribution and size of air bubbles in the foam concrete are optimized, the number of bubbles is remarkably increased and the size of the bubbles is reduced, and the fly ash is combined with chitosan to form a three-dimensional network structure in the foam concrete prepared through a penetration reaction treatment of the fly ash on the sodium alkyl sulfonate, so that the anti-cracking capability of the foam concrete is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of concrete technology, and in particular to a high-performance energy-saving foamed concrete and its preparation method. Background Technology

[0002] Foamed concrete, also known as expanded concrete or lightweight concrete, is a new type of lightweight thermal insulation material containing numerous closed pores. It is produced by mechanically foaming a foaming agent using a foaming machine's foaming system, uniformly mixing the foam with cement slurry, and then pouring the mixture in-situ or molding it using the machine's pumping system. Foamed concrete is lightweight, provides thermal insulation, and has good sound insulation properties. It is primarily used for roof insulation and slope leveling, ground insulation layers, filling foundation pits for uplift beams, and wall casting, among other energy-saving applications.

[0003] Chinese patent application CN111763051A discloses a high-performance foamed concrete and its preparation method. The raw materials of the high-performance foamed concrete, by weight, include: 30-70 parts cement mortar, 0.5-1.2 parts sodium α-olefin sulfonate, 0.1-0.3 parts saponins, 0.5-1.5 parts sodium alkyl sulfonate, 0.1-0.4 parts alkyl glycosides, 0.3-0.9 parts anionic polyacrylamide, 0.2-0.4 parts lecithin, 0.1-0.3 parts epoxidized soybean oil, 0.05-0.1 parts sodium alginate, 2-5 parts hydroxypropyl methylcellulose, 1-3 parts polyvinyl alcohol, 3-5 parts ethylene-vinyl acetate emulsion, 4-10 parts ultralight aggregate, 2-4 parts quick-setting agent, and 5-12 parts water.

[0004] However, when using sodium α-alkenyl sulfonate, saponins, sodium alkyl sulfonate, alkyl glycosides, anionic polyacrylamide, and lecithin as foaming agents, combined with ethylene-vinyl acetate emulsion and ultra-lightweight aggregates to improve compressive strength, the compressive strength of this high-performance foamed concrete can only reach 4.2-5.1 MPa, which is difficult to meet the current construction industry's requirements for the compressive strength of foamed concrete. Furthermore, it is difficult to guarantee the crack resistance of this high-performance foamed concrete during use, and it needs to be improved. Summary of the Invention

[0005] In view of this, the first objective of this application is to provide a high-performance, energy-saving foamed concrete to optimize the compressive strength and crack resistance of foamed concrete. The specific solution is as follows:

[0006] A high-performance energy-saving foamed concrete comprises the following components in parts by weight: 80-100 parts cement, 12-20 parts filler aggregate, 1-2 parts foaming agent, 0.5-2 parts water-reducing agent, 0.2-1 parts fiber material, and 30-50 parts water; wherein:

[0007] The filler aggregate is prepared by mixing and modifying fly ash, sodium alkyl sulfonate, chitosan, alumina, sodium alginate, n-propyl acetate and 4-chlorophenylboronic acid.

[0008] Preferably, the preparation of the filler aggregate includes steps s1, mixing chitosan, alumina, n-propyl acetate and 4-chlorophenylboronic acid to obtain a crude mixture; s2, adding the crude mixture to a reactor at 86-95°C, mixing with water and stirring for 10-20 minutes to obtain a reactant; s3, lowering the temperature of the reactant to room temperature and filtering to obtain a crude product; s4, mixing the crude product with fly ash, sodium alkyl sulfonate and sodium alginate to obtain a premix, then soaking the premix in a 70-90% ethanol aqueous solution for 12-24 hours, and finally removing it and drying it at 45-55°C for more than 24 hours to obtain the final product.

[0009] Preferably, in the coarse mixture, the mass ratio of chitosan, alumina and n-propyl acetate is 1:0.01-0.05:0.08-0.12; the molar ratio of chitosan to 4-chlorophenylboronic acid is 1:0.15-0.32; and the mass of chitosan is less than the mass of water.

[0010] Preferably, in the premix, the molar ratio of fly ash, sodium alkyl sulfonate and sodium alginate is 1:1.05-1.32:0.2-0.3; the mass ratio of fly ash to crude product is 1:0.6-2.1; and the mass ratio of the ethanol aqueous solution to the premix is ​​2-3.8:1.

[0011] Preferably, the foaming agent is sodium dodecyl sulfate.

[0012] Preferably, the water-reducing agent is a polycarboxylate water-reducing agent.

[0013] Preferably, the fiber material is a mixed fiber material of glass fiber, polyvinyl chloride fiber and phenolic fiber mixed in a mass ratio of 40-50:10:1-5.

[0014] The second objective of this application is to provide a method for preparing the high-performance energy-saving foamed concrete as described above, comprising the following steps: mixing and stirring a foaming agent with water at 20-35°C to obtain a foaming slurry; then mixing and stirring cement, filler aggregate, water-reducing agent, fiber material and water to obtain a cement slurry; finally mixing and stirring the foaming slurry and cement slurry evenly and then pouring the mixture into a mold to foam, cure and shape, thereby obtaining the finished foamed concrete.

[0015] Preferably, the mass ratio of water in the foamed slurry to that in the cement slurry is 3-10:20-47.

[0016] Preferably, the finished foamed concrete is obtained by curing at a controlled temperature of 20-28℃ for 7-28 days after foaming, curing and shaping.

[0017] As can be seen from the above scheme, this application provides a high-performance energy-saving foamed concrete and its preparation method. This high-performance energy-saving foamed concrete combines fly ash with chitosan. The crude product obtained by reacting with alumina, n-propyl acetate, and 4-chlorophenylboronic acid, after being mixed with fly ash, sodium alkyl sulfonate, and sodium alginate and dried, significantly improves the compressive strength of the foamed concrete while optimizing the distribution and size of air bubbles within the foamed concrete. This results in a significant increase in the number of bubbles and a decrease in their size. Furthermore, the fly ash, after being treated by the penetration reaction of sodium alkyl sulfonate, combines with chitosan to form a three-dimensional network structure within the prepared foamed concrete, thereby significantly improving the crack resistance of the foamed concrete. Simultaneously, the filler aggregate not only enhances the structural strength but also achieves the effects of activation and promotion of foamed concrete molding. Detailed Implementation

[0018] The technical solutions described below in conjunction with the embodiments of this application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] It should be mentioned that the cement used in this embodiment is silicate cement 42.5 purchased from Tangshan Liujiu Cement Co., Ltd.

[0020] The following will provide a detailed description of the high-performance energy-saving foamed concrete and its preparation method as described in this application.

[0021] A high-performance energy-saving foamed concrete comprises the following components in parts by weight: 80-100 parts cement, 12-20 parts filler aggregate, 1-2 parts foaming agent, 0.5-2 parts water-reducing agent, 0.2-1 parts fiber material, and 30-50 parts water.

[0022] In order to improve the structural strength of foamed concrete, the filler aggregate of this application is prepared by mixing and modifying fly ash, sodium alkyl sulfonate, chitosan, alumina, sodium alginate, n-propyl acetate and 4-chlorophenylboronic acid.

[0023] It should be noted that the preparation of filler aggregate includes steps s1, mixing chitosan, alumina, n-propyl acetate and 4-chlorophenylboronic acid to obtain a crude mixture; s2, putting the crude mixture into a reactor at 86-95℃, mixing with water and stirring for 10-20 minutes to obtain a reactant; s3, lowering the temperature of the reactant to room temperature and then filtering to obtain a crude product; s4, mixing the crude product with fly ash, sodium alkyl sulfonate and sodium alginate to obtain a premix, then soaking the premix in a 70-90% ethanol aqueous solution for 12-24 hours, and finally removing it and drying it at 45-55℃ for more than 24 hours to obtain the final product.

[0024] In the coarse mixture, the mass ratio of chitosan, alumina, and n-propyl acetate is 1:0.01-0.05:0.08-0.12. The molar ratio of chitosan to 4-chlorophenylboronic acid is 1:0.15-0.32, and the mass of chitosan is less than the mass of water. Meanwhile, in the premix, the molar ratio of fly ash, sodium alkyl sulfonate, and sodium alginate is 1:1.05-1.32:0.2-0.3. The mass ratio of fly ash to the coarse product is 1:0.6-2.1, and the mass ratio of the ethanol aqueous solution to the premix is ​​2-3.8:1.

[0025] In this application, a conventional foaming agent for foamed concrete and a conventional water-reducing agent for foamed concrete can be used. Further details are omitted here. Meanwhile, the fiber material is a mixed fiber material of glass fiber, polyvinyl chloride fiber, and phenolic fiber mixed in a mass ratio of 40-50:10:1-5.

[0026] A method for preparing high-performance energy-saving foamed concrete as described above includes the following steps: mixing and stirring a foaming agent with water at 20-35°C to obtain a foamed slurry; then mixing and stirring cement, filler aggregate, water-reducing agent, fiber material and water to obtain a cement slurry; finally mixing and stirring the foamed slurry and cement slurry evenly and then pouring the mixture into a mold for foaming, curing and shaping; and obtaining the finished foamed concrete after curing at a controlled temperature of 20-28°C for 7-28 days.

[0027] In the foaming slurry and cement slurry, the mass ratio of water used is 3-10:20-47.

[0028] Example 1

[0029] A high-performance energy-saving foamed concrete comprises the following components in parts by weight: 80 parts cement, 12 parts filler aggregate, 1 part sodium dodecyl sulfate, 0.5 parts polycarboxylate superplasticizer, 0.2 parts fiber material, and 30 parts water.

[0030] In order to improve the structural strength of foamed concrete, the filler aggregate of this application is prepared by mixing and modifying fly ash, sodium alkyl sulfonate, chitosan, alumina, sodium alginate, n-propyl acetate and 4-chlorophenylboronic acid.

[0031] It should be noted that the preparation of filler aggregate includes step s1, mixing chitosan, alumina, n-propyl acetate and 4-chlorophenylboronic acid to obtain a coarse mixture; s2, putting the coarse mixture into a reactor at 86°C, mixing it with water and stirring for 20 minutes to obtain the reactant.

[0032] s3. The temperature of the reactants is lowered to room temperature and then filtered to obtain the crude product; s4. The crude product is mixed with fly ash, sodium alkyl sulfonate and sodium alginate to obtain a premix, and then the premix is ​​soaked in 70% ethanol aqueous solution for 12 hours. Finally, it is taken out and dried at 45℃ for 28 hours.

[0033] In the coarse mixture, the mass ratio of chitosan, alumina, and n-propyl acetate is 1:0.01:0.08. The molar ratio of chitosan to 4-chlorophenylboronic acid is 1:0.15, and the mass of chitosan is less than the mass of water. Meanwhile, in the premix, the molar ratio of fly ash, sodium alkyl sulfonate, and sodium alginate is 1:1.05:0.2. The mass ratio of fly ash to the coarse product is 1:0.6, and the mass ratio of the ethanol aqueous solution to the premix is ​​2:1.

[0034] The fiber material is a mixed fiber material of glass fiber, polyvinyl chloride fiber and phenolic fiber mixed in a mass ratio of 40:10:1.

[0035] A method for preparing high-performance energy-saving foamed concrete as described above includes the following steps: mixing sodium dodecyl sulfate with water at 20°C to foam and obtain a foaming slurry; then mixing cement, filler aggregate, polycarboxylate superplasticizer, fiber material and water to obtain a cement slurry; finally, mixing the foaming slurry and cement slurry evenly and pouring the mixture into a mold for foaming, curing and shaping; and obtaining the finished foamed concrete after curing at a controlled temperature of 20°C for 28 days.

[0036] In the foaming slurry and cement slurry, the mass ratio of water used is 3:27.

[0037] Example 2

[0038] A high-performance energy-saving foamed concrete comprises the following components in parts by weight: 90 parts cement, 16 parts filler aggregate, 1.5 parts sodium dodecyl sulfate, 1 part polycarboxylate superplasticizer, 0.6 parts fiber material, and 40 parts water.

[0039] In order to improve the structural strength of foamed concrete, the filler aggregate of this application is prepared by mixing and modifying fly ash, sodium alkyl sulfonate, chitosan, alumina, sodium alginate, n-propyl acetate and 4-chlorophenylboronic acid.

[0040] It should be noted that the preparation of filler aggregate includes step s1, mixing chitosan, alumina, n-propyl acetate and 4-chlorophenylboronic acid to obtain a coarse mixture; s2, putting the coarse mixture into a reaction vessel at 90°C, mixing it with water and stirring for 15 minutes to obtain the reactant.

[0041] s3. The temperature of the reactants is lowered to room temperature and then filtered to obtain the crude product; s4. The crude product is mixed with fly ash, sodium alkyl sulfonate and sodium alginate to obtain a premix, and then the premix is ​​soaked in 80% ethanol aqueous solution for 18 hours. Finally, it is taken out and dried at 50°C for 27 hours.

[0042] In the coarse mixture, the mass ratio of chitosan, alumina, and n-propyl acetate is 1:0.03:0.10. The molar ratio of chitosan to 4-chlorophenylboronic acid is 1:0.22, and the mass of chitosan is less than the mass of water. Meanwhile, in the premix, the molar ratio of fly ash, sodium alkyl sulfonate, and sodium alginate is 1:1.17:0.25. The mass ratio of fly ash to the coarse product is 1:1.1, and the mass ratio of the ethanol aqueous solution to the premix is ​​2.9:1.

[0043] The fiber material is a mixed fiber material of glass fiber, polyvinyl chloride fiber and phenolic fiber mixed in a mass ratio of 45:10:3.

[0044] A method for preparing high-performance energy-saving foamed concrete as described above includes the following steps: mixing sodium dodecyl sulfate with water at 25°C to foam and obtain a foaming slurry; then mixing cement, filler aggregate, polycarboxylate superplasticizer, fiber material and water to obtain a cement slurry; finally mixing the foaming slurry and cement slurry evenly and then pouring the mixture into a mold for foaming, curing and shaping; and finally obtaining the finished foamed concrete after curing at a controlled temperature of 24°C for 28 days.

[0045] In the foaming slurry and cement slurry, the mass ratio of water used is 10:30.

[0046] Example 3

[0047] A high-performance energy-saving foamed concrete comprises the following components in parts by weight: 100 parts cement, 20 parts filler aggregate, 2 parts sodium dodecyl sulfate, 2 parts polycarboxylate superplasticizer, 1 part fiber material, and 50 parts water.

[0048] In order to improve the structural strength of foamed concrete, the filler aggregate of this application is prepared by mixing and modifying fly ash, sodium alkyl sulfonate, chitosan, alumina, sodium alginate, n-propyl acetate and 4-chlorophenylboronic acid.

[0049] It should be noted that the preparation of filler aggregate includes step s1, mixing chitosan, alumina, n-propyl acetate and 4-chlorophenylboronic acid to obtain a coarse mixture; s2, putting the coarse mixture into a reactor at 95°C, mixing it with water and stirring for 10 minutes to obtain the reactant.

[0050] s3. The temperature of the reactants is lowered to room temperature and then filtered to obtain a crude product; s4. The crude product is mixed with fly ash, sodium alkyl sulfonate and sodium alginate to obtain a premix, and then the premix is ​​soaked in 90% ethanol aqueous solution for 24 hours. Finally, it is taken out and dried at 55℃ for 25 hours.

[0051] In the coarse mixture, the mass ratio of chitosan, alumina, and n-propyl acetate is 1:0.05:0.12. The molar ratio of chitosan to 4-chlorophenylboronic acid is 1:0.32, and the mass of chitosan is less than the mass of water. Meanwhile, in the premix, the molar ratio of fly ash, sodium alkyl sulfonate, and sodium alginate is 1:1.32:0.3. The mass ratio of fly ash to the coarse product is 1:2.1, and the mass ratio of the ethanol aqueous solution to the premix is ​​3.8:1.

[0052] The fiber material is a mixed fiber material of glass fiber, polyvinyl chloride fiber and phenolic fiber mixed in a mass ratio of 50:10:5.

[0053] A method for preparing high-performance energy-saving foamed concrete as described above includes the following steps: mixing sodium dodecyl sulfate with water at 35°C to foam and obtain a foaming slurry; then mixing cement, filler aggregate, polycarboxylate superplasticizer, fiber material and water to obtain a cement slurry; finally mixing the foaming slurry and cement slurry evenly and then pouring the mixture into a mold for foaming, curing and shaping; and finally obtaining the finished foamed concrete after curing at a controlled temperature of 28°C for 28 days.

[0054] In the foaming slurry and cement slurry, the mass ratio of water used is 5:44.

[0055] Example 4

[0056] The difference between Example 4 and Example 3 is that the 4-chlorophenylboronic acid in Example 4 is modified by methoxy-substituted halogen, and the modification is based on the reaction of N-methylpyrrolidone and sodium methoxide with 4-chlorophenylboronic acid at 120°C.

[0057] Comparative Example 1

[0058] The difference between Comparative Example 1 and Example 2 is that the filler aggregate in Comparative Example 1 is composed of a mixture of fly ash and chitosan.

[0059] Comparative Example 2

[0060] The difference between Comparative Example 2 and Example 2 is that 4-chlorophenylboronic acid was not added in Comparative Example 2.

[0061] Comparative Example 3

[0062] The difference between Comparative Example 3 and Example 2 is that sodium alkyl sulfonate was not added in Comparative Example 3.

[0063] Comparative Example 4

[0064] The difference between Comparative Example 4 and Example 2 is that the finished foamed concrete in Comparative Example 4 was obtained after curing at a controlled temperature of 24°C for 7 days.

[0065] Comparative Example 5

[0066] The difference between Comparative Example 5 and Example 2 is that the finished foamed concrete in Comparative Example 5 was obtained after curing at a controlled temperature of 24°C for 14 days.

[0067] Test content:

[0068] 1. Bubble pore size and porosity testing;

[0069] 2. Strength test:

[0070] According to GB / T50081-2019 "Standard for Test Methods of Physical and Mechanical Properties of Concrete". Compressive strength and flexural strength were tested.

[0071] 3. Crack resistance test:

[0072] According to GB / T50082—2009 "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete", the crack resistance of foamed concrete is evaluated using the knife-edge restraint induction method, and the crack resistance grade is classified according to the total crack area per unit area in JGJ / T193-2009 "Standard for Evaluation of Durability of Concrete".

[0073] Table 1 Performance Test Results

[0074]

[0075]

[0076] As shown in Table 1 above, the compressive strength of the finished foamed concrete is significantly improved after the curing period is increased. Furthermore, when using the filler aggregate of this application, the finished concrete can achieve the effects of significantly improving compressive strength and crack resistance while reducing the bubble pore size and increasing porosity, thus avoiding the problem of increased density and decreased crack resistance of foamed concrete due to increased strength.

[0077] In summary, this application provides a high-performance energy-saving foamed concrete and its preparation method. This high-performance energy-saving foamed concrete combines fly ash with chitosan. The crude product obtained by reacting fly ash with alumina, n-propyl acetate, and 4-chlorophenylboronic acid, after being mixed with fly ash, sodium alkyl sulfonate, and sodium alginate and dried, significantly improves the compressive strength of the foamed concrete while optimizing the distribution and size of air bubbles within it. This results in a significant increase in the number of bubbles and a decrease in their size. Furthermore, the fly ash, through the penetration reaction of sodium alkyl sulfonate, combines with chitosan to form a three-dimensional network structure within the prepared foamed concrete, thereby significantly improving its crack resistance. Simultaneously, the filler aggregate enhances structural strength while also activating the foam and promoting its molding.

[0078] The terms “first,” “second,” “third,” “fourth,” etc., used in this application (if applicable) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, or apparatus that includes a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, or apparatus.

[0079] It should be noted that the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0080] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A high-performance energy-saving foamed concrete, characterized in that, After foaming, curing, and shaping, the high-performance energy-saving foamed concrete is obtained by curing at a controlled temperature of 20-28℃ for 7-28 days. The components include the following parts by weight: 80-100 parts cement, 12-20 parts filler aggregate, 1-2 parts foaming agent, 0.5-2 parts water-reducing agent, 0.2-1 parts fiber material, and 30-50 parts water. in: The filler aggregate is prepared by mixing and modifying fly ash, sodium alkyl sulfonate, chitosan, alumina, sodium alginate, n-propyl acetate and 4-chlorophenylboronic acid. The preparation of the filler aggregate includes steps s1, mixing chitosan, alumina, n-propyl acetate and 4-chlorophenylboronic acid to obtain a crude mixture; s2, adding the crude mixture to a reactor at 86-95℃, mixing with water and stirring for 10-20 minutes to obtain a reactant; s3, lowering the temperature of the reactant to room temperature and filtering to obtain a crude product; s4, mixing the crude product with fly ash, sodium alkyl sulfonate and sodium alginate to obtain a premix, then soaking the premix in a 70-90% ethanol aqueous solution for 12-24 hours, and finally removing it and drying it at 45-55℃ for more than 24 hours to obtain the final product. In the crude mixture, the mass ratio of chitosan, alumina, and n-propyl acetate is 1:0.01-0.05:0.08-0.12; the molar ratio of chitosan to 4-chlorophenylboronic acid is 1:0.15-0.

32. In the premix, the molar ratio of fly ash, sodium alkyl sulfonate and sodium alginate is 1:1.05-1.32:0.2-0.3; the mass ratio of fly ash to crude product is 1:0.6-2.1; and the mass ratio of the ethanol aqueous solution to the premix is ​​2-3.8:

1.

2. The high-performance energy-saving foamed concrete according to claim 1, characterized in that: The foaming agent is sodium dodecyl sulfate.

3. The high-performance energy-saving foamed concrete according to claim 1, characterized in that: The water-reducing agent is a polycarboxylate water-reducing agent.

4. The high-performance energy-saving foamed concrete according to claim 1, characterized in that: The fiber material is a mixed fiber material of glass fiber, polyvinyl chloride fiber and phenolic fiber mixed in a mass ratio of 40-50:10:1-5.

5. A method for preparing high-performance energy-saving foamed concrete, used to prepare the high-performance energy-saving foamed concrete as described in any one of claims 1-4, characterized in that, The process includes the following steps: mixing and stirring a foaming agent with water at 20-35℃ to obtain a foamed slurry; then mixing and stirring cement, filler aggregate, water-reducing agent, fiber material, and water to obtain a cement slurry; finally, mixing the foamed slurry and cement slurry evenly and pouring the mixture into a mold to foam, cure, and shape; and then curing at a controlled temperature of 20-28℃ for 7-28 days to obtain the finished foamed concrete.

6. The method for preparing high-performance energy-saving foamed concrete according to claim 5, characterized in that: The mass ratio of water in the foamed slurry to that in the cement slurry is 3-10:20-47.

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