A kind of controllable heat release type lightweight concrete and preparation method thereof

Abstract

The present application relates to the field of concrete technology, and specifically discloses a controlled heat-release lightweight concrete and a preparation method thereof. The controlled heat-release lightweight concrete provided in the present application comprises the following components in parts by weight: 250-320 parts of cement, 2.4-3.7 parts of foam stabilizer, 2-2.6 parts of composite foaming agent, 5-10 parts of super absorbent resin, 1-4 parts of accelerator, 3-9 parts of water reducer, 0.5-2 parts of fiber, and 130-180 parts of water; the composite foaming agent is hydrogen peroxide and ethyl azide formate in a weight ratio of 1:(0.15-0.35); the present application also provides a preparation method for the above-mentioned controlled heat-release lightweight concrete. The controlled heat-release lightweight concrete provided in the present application has a stable bubble structure and a small temperature variation during the foaming process, and will not experience bubble breakage, pore wall defects, or heat accumulation effects. The obtained lightweight concrete has good shrinkage performance and excellent mechanical properties.

Description

Technical Field

[0001] The present application relates to the field of concrete technology, and in particular to a controllable heat-release lightweight concrete and a preparation method thereof. Background Art

[0002] Ultra-lightweight concrete is a new building material with low density, high strength, and excellent collapse energy absorption properties. It is widely used in transportation engineering applications such as highway escape lanes and airport runway arresting systems. Compared to traditional concrete, ultra-lightweight concrete reduces its density by introducing air bubbles, thereby reducing the weight of the concrete structure and improving its performance and construction efficiency.

[0003] Currently, the primary foaming agent used in ultra-lightweight concrete production is hydrogen peroxide, which catalytically decomposes to produce oxygen, forming a uniform bubble structure. However, the decomposition process of these foaming agents can lead to excessively high temperatures, which can cause bubble breakage, pore wall defects, and heat accumulation in lightweight concrete. This severely impacts the quality and performance of ultra-lightweight concrete, limiting its widespread application in traffic control projects. Summary of the Invention

[0004] In order to solve the problems of bubble breaking, pore wall defects and heat accumulation effect that are prone to occur in the existing ultra-lightweight concrete preparation process, the present application provides a controllable heat release lightweight concrete.

[0005] In a first aspect, the present application provides a controlled heat release lightweight concrete, which adopts the following technical solution:

[0006] A controlled heat-release lightweight concrete comprises the following components in parts by weight: 250-320 parts of cement, 2.4-3.7 parts of a foam stabilizer, 2-2.6 parts of a composite foaming agent, 5-10 parts of a highly absorbent resin, 1-4 parts of an accelerating setting agent, 3-9 parts of a water reducing agent, 0.5-2 parts of fiber, and 130-180 parts of water;

[0007] The composite foaming agent is hydrogen peroxide and ethyl azide formate in a weight ratio of 1: (0.15-0.35).

[0008] The present application provides a controlled heat-release lightweight concrete, which uses a mixture of hydrogen peroxide and ethyl azide as a foaming agent. By adjusting the ratio of hydrogen peroxide to ethyl azide, the heat released by hydrogen peroxide is effectively utilized to stimulate the decomposition and foaming of ethyl azide, which has a low decomposition heat. This avoids the drawback of hydrogen peroxide as a single foaming agent, which releases a large amount of heat and causes bubble breakage or pore wall defects. Furthermore, the two components achieve a significant foaming effect and improve the structural stability of the bubbles. The controlled heat-release lightweight concrete produced using this composite foaming agent exhibits bubbles of suitable size, good uniformity, and excellent mechanical properties. Its application in arresting systems such as airport runways can fully utilize its collapse energy absorption properties, effectively arresting crashed aircraft and other vehicles.

[0009] In some embodiments, the weight ratio of hydrogen peroxide to ethyl azide can be 1:(0.15-0.2), 1:(0.15-0.25), 1:(0.15-0.3), 1:(0.15-0.35), 1:(0.2-0.25), 1:(0.2-0.3), 1:(0.2-0.35), 1:(0.25-0.3), 1:(0.25-0.35) or 1:(0.3-0.35).

[0010] In a specific embodiment, the weight ratio of the hydrogen peroxide to ethyl azide formate can also be 1:0.15, 1:0.2, 1:0.25, 1:0.3 or 1:0.35.

[0011] Optionally, the weight ratio of the hydrogen peroxide to ethyl azide formate is 1:(0.2-0.3).

[0012] Optionally, the foaming agent is prepared by mixing hydrogen peroxide and ethyl azide formate, and stirring the mixture at a rotation speed of 300-500 rpm for 90-150 seconds to obtain a composite foaming agent.

[0013] Optionally, the super absorbent resin is acrylamide-sodium acrylate copolymer with a particle size of 80 to 700 μm and a bulk density of 0.6 to 0.9 g / cm 3 , water retention rate ≥85%.

[0014] Optionally, the super absorbent resin needs to be pre-saturated with water and frozen before use.

[0015] In the present application, by pre-saturating the super absorbent resin with water and freezing it, part of the water can be frozen and sealed. During the preparation and curing process of concrete, the frozen and sealed water can absorb the heat in the concrete, especially the heat generated by the decomposition of hydrogen peroxide, through melting, thereby playing a cooling role. In addition, during the melting process of the frozen water, not only can the local high temperature caused by the cement hydration reaction and the decomposition of the foaming agent be effectively alleviated, but the gradually released water can also provide a long-lasting internal curing effect for the concrete, promote the uniform hydration of cement particles, and thus improve the densification of the microstructure and the macro-collapse performance of the concrete.

[0016] Optionally, the foam stabilizer is selected from one or more of methyl cellulose ether, hydroxyethyl cellulose ether, hydroxyethyl methyl cellulose ether, hydroxypropyl methyl cellulose ether, stearate series foam stabilizers, styrene-butadiene emulsion and ethylene-vinyl acetate emulsion.

[0017] Optionally, the foam stabilizer is a mixture of hydroxyethyl cellulose ether and calcium stearate in a weight ratio of 1:(3-6).

[0018] In some embodiments, the weight ratio of the hydroxyethyl cellulose ether to calcium stearate may be 1:(3-4), 1:(3-5), 1:(3-6), 1:(4-5), 1:(4-6) or 1:(5-6).

[0019] In a specific embodiment, the weight ratio of the hydroxyethyl cellulose ether to calcium stearate can also be 1:3, 1:4, 1:5, or 1:6.

[0020] Optionally, the water reducer is selected from one or more of polycarboxylic acid water reducers, naphthalene water reducers, anthracene water reducers, lignin sulfonate water reducers, aminosulfonate water reducers, aliphatic water reducers and melamine water reducers;

[0021] The accelerating setting agent is selected from one or more of alumina clinker accelerating setting agents, water glass accelerating setting agents, aluminate accelerating setting agents and aluminum sulfate accelerating setting agents;

[0022] The water reducer is selected from one or more of polycarboxylic acid water reducers, naphthalene water reducers, anthracene water reducers, lignin sulfonate water reducers, aminosulfonate water reducers, aliphatic water reducers and melamine water reducers;

[0023] The fibers are selected from one or more of polypropylene fibers, polyvinyl alcohol fibers and carbon fibers.

[0024] Optionally, the cement is low-heat Portland cement with low hydration heat, the clinker dicalcium silicate content is ≥40%, or the iron phase content is ≥15%, and specifically one of high-belite Portland cement and road Portland cement can be selected.

[0025] This application uses high-belite silicate cement or road silicate cement with low hydration heat characteristics to overcome the problem of high heat caused by the cementitious components of traditional ultra-light concrete materials, and at the same time solves the problem of compatibility between existing silicate cement and auxiliary cementitious materials.

[0026] In a second aspect, the present application provides a method for preparing the above-mentioned controlled heat release lightweight concrete.

[0027] A method for preparing controlled heat release lightweight concrete comprises the following steps:

[0028] Mix cement, foam stabilizer and fiber evenly to obtain dry mixed material;

[0029] Disperse the water reducer in half of the water and mix it with the dry mixed material, stirring evenly; then add the accelerating setting agent and stir evenly to obtain a slurry;

[0030] The foaming agent is mixed with the remaining water and stirred at a speed of 1000-3000 rpm for 40-60 seconds. Then, the frozen super absorbent resin and the foaming agent are added to the slurry and stirred at a speed of 500-600 rpm for 60-180 seconds to obtain a controlled heat release lightweight concrete.

[0031] Optionally, the frozen super absorbent resin is prepared by immersing the super absorbent resin in water for 5 to 60 minutes, and then freezing it at -(15 to 25)°C for 1 to 6 hours to obtain the frozen super absorbent resin.

[0032] In summary, this application has the following beneficial effects:

[0033] 1. This application uses a mixture of hydrogen peroxide and ethyl azide as a foaming agent. By adjusting the ratio of hydrogen peroxide to ethyl azide to within the range of 1: (0.15-0.35), the defects of hydrogen peroxide as a single foaming agent, such as the huge heat release causing bubble breakage or pore wall defects, are effectively avoided. In addition, the foaming effect of the concrete is significant, the structural stability of the bubbles is good, and the obtained concrete has a crushability of ≥0.6 and a semi-collapse energy of ≥110-116 J.

[0034] 2. This application can alleviate local high temperatures during concrete preparation by pre-saturating and freezing the super absorbent resin, provide a long-lasting internal curing effect for the concrete, effectively promote the uniform hydration of cement particles, and thus improve the densification of the concrete's microstructure and macro-shrinkage performance.

[0035] 3. The present application further selects a mixture of hydroxyethyl cellulose ether and calcium stearate in a weight ratio of 1:(3-6) as a foam stabilizer, and the obtained concrete has better performance. DETAILED DESCRIPTION

[0036] The present application provides a controlled heat release lightweight concrete, comprising the following components in parts by weight: 250-320 parts of cement, 2.4-3.7 parts of foam stabilizer, 2-2.6 parts of composite foaming agent, 5-10 parts of super absorbent resin, 1-4 parts of accelerator, 3-9 parts of water reducer, 0.5-2 parts of fiber and 130-180 parts of water; the composite foaming agent is hydrogen peroxide and ethyl azide in a weight ratio of 1: (0.15-0.35); further, the weight ratio of hydrogen peroxide to ethyl azide is 1: (0.2-0.3). The super absorbent resin is an acrylamide-sodium acrylate copolymer with a particle size of 80-700 μm and a bulk density of 0.6-0.9 g / cm 3 , water retention rate ≥85%.

[0037] The foam stabilizer is selected from one or more of methyl cellulose ether, hydroxyethyl cellulose ether, hydroxyethyl methyl cellulose ether, hydroxypropyl methyl cellulose ether, stearate series foam stabilizers, styrene-butadiene emulsion, and ethylene-vinyl acetate emulsion. Furthermore, the foam stabilizer is a mixture of hydroxyethyl cellulose ether and calcium stearate in a weight ratio of 1:(3-6).

[0038] The water reducer is selected from one or more of polycarboxylic acid water reducers, naphthalene water reducers, anthracene water reducers, lignin sulfonate water reducers, aminosulfonate water reducers, aliphatic water reducers and melamine water reducers; the accelerator is selected from one or more of alumina clinker accelerators, water glass accelerators, aluminate accelerators and aluminum sulfate accelerators; the water reducer is selected from one or more of polycarboxylic acid water reducers, naphthalene water reducers, anthracene water reducers, lignin sulfonate water reducers, aminosulfonate water reducers, aliphatic water reducers and melamine water reducers; the fiber is selected from one or more of polypropylene fiber, polyvinyl alcohol fiber and carbon fiber.

[0039] The present application also provides a method for preparing the above-mentioned controlled heat release lightweight concrete, comprising the following steps:

[0040] (1) Weigh each component according to weight; immerse the super absorbent resin in water for 5 to 60 minutes, and then freeze it at -(15 to 25)°C for 1 to 6 hours to obtain a frozen super absorbent resin.

[0041] (2) Put cement, foam stabilizer, and fiber into a mixer and mix and stir for 60-120 seconds to obtain a dry mix;

[0042] (3) Disperse the water reducer in half of the water and inject it into the dry mixed material, mix and stir evenly; then add the accelerator and continue stirring for 60-120 seconds to obtain a slurry;

[0043] (4) The foaming agent is mixed with the remaining water, and stirred at a speed of 1000-3000 rpm for 40-60 seconds. Then, the frozen super absorbent resin and the foaming agent are added to the slurry, and stirred at a speed of 500-600 rpm for 60-180 seconds to obtain a controlled heat release lightweight concrete.

[0044] In the examples of this application, the cement used was high-belite 42.5 low-heat Portland cement, purchased from Jiahua Special Cement Co., Ltd.; hydroxyethyl cellulose ether was purchased from Feicheng Yutian Chemical Co., Ltd.; calcium stearate foam stabilizer was purchased from Jingjiang Guangsheng Rubber and Plastic Material Factory; the superabsorbent resin was acrylamide-sodium acrylate copolymer, purchased from Shandong Huadi New Materials Co., Ltd.; the water reducer was a polycarboxylic acid-based water reducer, model number PC-311; the accelerator was ZY-98; and the fiber was polypropylene fiber, purchased from Shandong Honggu New Materials. All raw materials, reagents, and solvents used in this application are commercially available.

[0045] The present application is further described in detail below with reference to preparation examples, embodiments and performance testing experiments.

[0046] Preparation Examples 1-5

[0047] Preparation Examples 1-5 each provide a composite foaming agent.

[0048] The difference between the above preparation examples is that the weight ratio of hydrogen peroxide to ethyl azide formate is shown in Table 1 below.

[0049] The preparation method of the composite foaming agent provided in Preparation Example 1-5 is as follows: hydrogen peroxide and ethyl azide formate are mixed, and the mixture is stirred at a rotation speed of 400 rpm for 120 seconds to obtain the composite foaming agent.

[0050] Table 1 Weight ratio of hydrogen peroxide to ethyl azide in the composite foaming agent provided in Preparation Examples 1-5

[0051]

[0052] Comparative Preparation Example 1

[0053] Comparative Preparation Example 1 provides a composite foaming agent.

[0054] The difference between the comparative preparation example and preparation example 3 is that the amount of ethyl azide formate added is 0.5 kg, that is, the weight ratio of hydrogen peroxide to ethyl azide formate is 1:0.5.

[0055] Examples 1-5

[0056] Examples 1-5 each provide a controlled heat release lightweight concrete.

[0057] The difference between the above embodiments is that the composite foaming agent in the controlled heat release lightweight concrete is derived from Preparation Examples 1-5 respectively.

[0058] The method for preparing the controlled heat release lightweight concrete provided in Examples 1-5 comprises the following steps:

[0059] (1) Weigh the following components by weight: 28 kg of cement, 0.3 kg of hydroxyethyl cellulose ether, 0.23 kg of composite foaming agent, 0.8 kg of super absorbent resin, 0.2 kg of accelerator, 0.6 kg of water reducer, 0.1 kg of fiber, and 15 kg of water;

[0060] The super absorbent resin was immersed in water for 30 minutes, and then frozen at -20°C for 3 hours to obtain the frozen super absorbent resin.

[0061] (2) Cement, foam stabilizer, and fiber were placed in a mixer and mixed for 90 seconds to obtain a dry mix;

[0062] (3) Disperse the water reducer in 7.5 kg of water and inject it into the dry mixed material, mix and stir evenly; then add the accelerator and continue stirring for 90 seconds to obtain a slurry;

[0063] (4) The foaming agent was mixed with the remaining 7.5 kg of water and stirred at a speed of 2000 rpm for 50 seconds. The frozen super absorbent resin and the foaming agent were then added to the slurry and stirred at a speed of 550 rpm for 120 seconds to obtain a controlled heat release lightweight concrete.

[0064] Example 6

[0065] Example 6 provides a controlled heat release lightweight concrete.

[0066] The difference between the above embodiment and embodiment 3 is that the super absorbent resin in the controlled heat release lightweight concrete is not subjected to pre-saturated water freezing treatment and is directly added to the concrete.

[0067] Examples 7-13

[0068] Examples 7-13 each provide a controlled heat release lightweight concrete.

[0069] The difference between the above embodiment and embodiment 3 is that the type and proportion of the foam stabilizer in the controlled heat release lightweight concrete are shown in Table 2 below.

[0070] Table 2 Types and ratios of foam stabilizers in Preparation Examples 3 and 7-13

[0071] Preparation Example Foam stabilizer 3 Hydroxyethyl cellulose ether 7 calcium stearate 8 Hydroxyethyl cellulose ether and calcium stearate in a weight ratio of 1:3 9 Hydroxyethyl cellulose ether and calcium stearate in a weight ratio of 1:4 10 Hydroxyethyl cellulose ether and calcium stearate in a weight ratio of 1:5 11 Hydroxyethyl cellulose ether and calcium stearate in a weight ratio of 1:6 12 Hydroxyethyl cellulose ether and methyl cellulose ether in a weight ratio of 1:4 13 Methyl cellulose ether and calcium stearate in a weight ratio of 1:4

[0072] Comparative Example 1

[0073] Comparative Example 1 provides a controlled heat release lightweight concrete.

[0074] The difference between the comparative example and Example 3 is that the composite foaming agent in the controlled heat release lightweight concrete is replaced by hydrogen peroxide.

[0075] Comparative Example 2

[0076] Comparative Example 2 provides a controlled heat release lightweight concrete.

[0077] The difference between the comparative example and Example 3 is that the composite foaming agent in the controlled heat release lightweight concrete is replaced by ethyl azide formate.

[0078] Performance testing

[0079] The performance of the controlled heat release lightweight concrete provided in Examples 1-13 and Comparative Examples 1-2 was tested, and the results are shown in Table 3 below.

[0080] (1) Pore structure: Take any side of a 100 mm × 100 mm × 100 mm specimen and cut vertically downward along the line connecting the midpoints of two non-adjacent sides of the specimen to obtain a 100 mm × 100 mm cross section. The cross section is painted black with ink, and the open pores of the cross section are filled with white calcium carbonate powder. The cross section is scanned and imaged using a flatbed scanning method. The photo is then converted to black and white using Photoshop, and the pore size and distribution of the ultra-lightweight concrete are analyzed using Image-Pro Plus image software.

[0081] (2) Shrinkage (mechanical properties): the ratio of the concrete's crush depth to its height; the greater the shrinkage, the greater the material's crush depth and the worse the material's mechanical properties.

[0082] (3) Half-collapse energy: the total energy absorbed by the concrete when the collapse degree reaches 0.5; the larger the half-collapse energy, the better the collapse energy absorption characteristics of the material and the higher the safety factor of the material.

[0083] Table 3 Performance test results of lightweight concrete obtained from Examples 1-13 and Comparative Examples 1-2

[0084]

[0085] According to the test results in Table 3, the pore size distribution of the controlled heat release lightweight concrete obtained in Examples 1-13 of the present application is mainly concentrated in the range of 1.5 to 2.0 mm, the shrinkage degree of the lightweight concrete is 0.61-0.85, and the semi-collapse energy is 110.4-120.5 J; while the pore size distribution of the lightweight concrete obtained in Comparative Example 1 is mainly concentrated in the range of 1.5 to 3.0 mm, the pore size distribution is relatively wide, and the shrinkage degree of the obtained lightweight concrete is 0.92, and the semi-collapse energy is 98.4 J; the pore size distribution of the lightweight concrete obtained in Comparative Example 2 is mainly concentrated in the range of 1.0 to 3.0 mm, the pore size distribution is relatively wide, and the shrinkage degree of the obtained lightweight concrete is 0.90, and the semi-collapse energy is 96.45 J. Therefore, it is shown that the bubbles in the controlled heat release lightweight concrete provided by this application are of appropriate size, good uniformity, and excellent mechanical properties. When used in arresting systems such as airport runways, it can give full play to its collapse energy absorption characteristics and achieve efficient arrestment of accident vehicles such as crashed aircraft.

[0086] The test results of Examples 1-5 show that the proportion of pores of 1.5 to 2.0 mm in the lightweight concrete obtained in Examples 2-4 is 57.31-65.84%, the shrinkage of the lightweight concrete is 0.73-0.78, and the semi-collapse energy is 114.3-116.5 J; while the proportion of pores of 1.5 to 2.0 mm in the lightweight concrete obtained in Examples 1 and 5 is 46.77-49.36%, the shrinkage of the lightweight concrete is 0.80-0.81, and the semi-collapse energy is 110.4-112.6 J, indicating that the present application further controls the weight ratio of hydrogen peroxide to ethyl azide in the composite foaming agent within the range of 1: (0.2-0.3), and the obtained lightweight concrete has better bubble uniformity and stability, and better shrinkage performance.

[0087] The test results of Examples 3 and 6 show that the shrinkage performance of the lightweight concrete obtained in Example 3 is significantly better than that of the lightweight concrete obtained in Example 6, indicating that pre-saturated freezing treatment of the super absorbent resin can improve the hydration effect of cement in concrete, thereby improving the shrinkage performance of the concrete.

[0088] The test results of Examples 3 and 7-13 show that, in Examples 3 and 7, hydroxyethyl cellulose ether or calcium stearate is used as a foam stabilizer, and the proportion of 1.5-2.0 mm pores in the obtained lightweight concrete is 59.72-65.84%, the shrinkage of the lightweight concrete is 0.73-0.78, and the semi-collapse energy is 113.2-116.5 J; in Examples 8-11, a mixture of hydroxyethyl cellulose ether and calcium stearate is used as a foam stabilizer, and the proportion of 1.5-2.0 mm pores in the obtained lightweight concrete is 10. The pore ratio is 68.73-72.45%, the shrinkage of the lightweight concrete is 0.61-0.65, and the half-collapse energy is 117.2-120.5 J. Examples 12-13 use a mixture of hydroxyethyl cellulose ether and methyl cellulose ether or a mixture of methyl cellulose ether and calcium stearate, and the pore ratio of 1.5-2.0 mm in the obtained lightweight concrete is 58.97-66.35%, the shrinkage of the lightweight concrete is 0.69-0.72, and the half-collapse energy is 116.8-117.1 J. Therefore, it is shown that the lightweight concrete obtained by using the mixture of hydroxyethyl cellulose ether and calcium stearate as a foam stabilizer in this application has better shrinkage performance.

[0089] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the present invention. Therefore, such modifications and improvements, which do not depart from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A controlled heat release lightweight concrete, characterized in that: The invention comprises the following components in parts by weight: 250-320 parts of cement, 2.4-3.7 parts of foam stabilizer, 2-2.6 parts of composite foaming agent, 5-10 parts of super absorbent resin, 1-4 parts of accelerating setting agent, 3-9 parts of water reducing agent, 0.5-2 parts of fiber and 130-180 parts of water; The composite foaming agent is hydrogen peroxide and ethyl azide formate in a weight ratio of 1: (0.15-0.35).

2. The controlled heat release lightweight concrete according to claim 1, characterized in that: The weight ratio of the hydrogen peroxide to ethyl azide formate is 1:(0.2-0.3).

3. The controlled heat release lightweight concrete according to claim 1, characterized in that: The preparation method of the foaming agent comprises the following steps: mixing hydrogen peroxide and ethyl azide formate, and stirring the mixture at a rotation speed of 300-500 rpm for 90-150 seconds to obtain a composite foaming agent.

4. The controlled heat release lightweight concrete according to claim 1, characterized in that: The super absorbent resin is acrylamide-sodium acrylate copolymer with a particle size of 80-700 μm and a bulk density of 0.6-0.9 g / cm 3 , water retention rate ≥85%.

5. The controlled heat release lightweight concrete according to claim 1, characterized in that: The super absorbent resin needs to be pre-saturated with water and frozen before use.

6. The controlled heat release lightweight concrete according to claim 1, characterized in that: The foam stabilizer is selected from one or more of methyl cellulose ether, hydroxyethyl cellulose ether, hydroxyethyl methyl cellulose ether, hydroxypropyl methyl cellulose ether, stearate series foam stabilizers, styrene-butadiene emulsion and ethylene-vinyl acetate emulsion.

7. The controlled heat release lightweight concrete according to claim 1, characterized in that: The foam stabilizer is a mixture of hydroxyethyl cellulose ether and calcium stearate in a weight ratio of 1:(3-6).

8. The controlled heat release lightweight concrete according to claim 1, characterized in that: The water reducer is selected from one or more of polycarboxylic acid water reducers, naphthalene water reducers, anthracene water reducers, lignin sulfonate water reducers, aminosulfonate water reducers, aliphatic water reducers and melamine water reducers; The accelerating setting agent is selected from one or more of alumina clinker accelerating setting agents, water glass accelerating setting agents, aluminate accelerating setting agents and aluminum sulfate accelerating setting agents; The water reducer is selected from one or more of polycarboxylic acid water reducers, naphthalene water reducers, anthracene water reducers, lignin sulfonate water reducers, aminosulfonate water reducers, aliphatic water reducers and melamine water reducers; The fibers are selected from one or more of polypropylene fibers, polyvinyl alcohol fibers and carbon fibers.

9. The method for preparing controlled heat release lightweight concrete according to any one of claims 1 to 8, characterized in that: The following steps are involved: Mix cement, foam stabilizer and fiber evenly to obtain dry mixed material; Disperse the water reducer in half of the water and mix it with the dry mixed material, stirring evenly; then add the accelerating setting agent and stir evenly to obtain a slurry; The foaming agent is mixed with the remaining water and stirred at a speed of 1000-3000 rpm for 40-60 seconds. Then, the frozen super absorbent resin and the foaming agent are added to the slurry and stirred at a speed of 500-600 rpm for 60-180 seconds to obtain a controlled heat release lightweight concrete.

10. The method for preparing controlled heat release lightweight concrete according to claim 9, characterized in that: The preparation method of the frozen super absorbent resin is as follows: immersing the super absorbent resin in water for 5 to 60 minutes, and then freezing it at -(15 to 25)°C for 1 to 6 hours to obtain the frozen super absorbent resin.

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