A high-strength all-light concrete and its preparation method and application

Abstract

The present invention discloses a high-strength, all-lightweight concrete, its preparation method, and application. The raw materials, calculated by weight, include 500-540 parts of cement, 90-110 parts of mineral powder, 50-60 parts of fly ash, 300-500 parts of ceramic sand, 350-380 parts of shale ceramsite, and 60-70 parts of hydroxypropyl cellulose. The present invention proposes a high-strength, all-lightweight concrete that improves the homogeneity of lightweight concrete, ensuring good workability with high fluidity and high strength.

Description

Technical Field

[0001] The present invention belongs to the technical field of building materials, and in particular relates to a high-strength all-light concrete and a preparation method and application thereof. Background Art

[0002] Modern civil engineering projects place new demands on the quality, energy efficiency, and fire safety of structural components. Lightweight concrete has emerged as one of the key solutions to these challenges. Compared to conventional concrete, its fundamental characteristics include lower bulk density and superior thermal insulation. Consequently, it is not only considered a building material but is also widely used as a thermal insulation material and aesthetic building finish. From an earthquake resistance perspective, lightweight aggregate concrete offers significant advantages due to its low deadweight. Furthermore, lightweight aggregates are typically expansive materials, making them highly effective in sound and thermal insulation. By partially or completely replacing conventional concrete with lightweight aggregate concrete, the dead load on a structure can be significantly reduced, resulting in considerable benefits. However, a major challenge with the application of lightweight aggregate concrete in Chinese engineering projects remains its relatively low strength. Existing lightweight concrete is relatively weak. The strength grade of lightweight aggregate concrete currently used is mainly concentrated below LC40, which limits its scope of use. At the same time, its workability during application is poor. This is mainly because the dry expanded clay causes the slump of the concrete mixture to decrease after absorbing water. The greater the water absorption rate, the greater the slump loss. Moreover, due to the large difference in density between expanded clay and cement mortar, expanded clay concrete is prone to stratification and segregation during the mixing process. Therefore, expanded clay concrete is prone to stratification and segregation, and has a large slump loss. In addition, under the action of pressure, lightweight aggregate is prone to absorbing moisture in the concrete. Multiple factors lead to the problem of pump blockage when pumping expanded clay concrete.

[0003] Therefore, it is imperative to provide a fully lightweight concrete with good homogeneity and high strength. Summary of the Invention

[0004] The present invention aims to address at least one of the technical problems existing in the aforementioned prior art. To this end, the present invention proposes a high-strength, all-lightweight concrete that improves the homogeneity of lightweight concrete, ensuring excellent workability and high strength with high fluidity. This concrete has a slump of ≥240mm and a spread of ≥550mm, excellent workability, and achieves an LC60 strength grade. It also addresses the problems of poor homogeneity and low strength associated with all-lightweight concrete.

[0005] The present invention also provides a method for preparing the high-strength all-light concrete.

[0006] The present invention also proposes the application of the high-strength all-light concrete in high-rise buildings.

[0007] According to a first aspect of the present invention, a high-strength, all-light concrete is proposed. The raw materials for its preparation include, by weight, 500-540 parts of cement, 90-110 parts of mineral powder, 50-60 parts of fly ash, 400-500 parts of pottery sand, 350-380 parts of shale ceramsite, and 60-70 parts of hydroxypropyl cellulose.

[0008] The embodiments according to the first aspect of the present invention have at least the following beneficial effects:

[0009] In the present invention, hydroxypropyl cellulose is added as a modifier when preparing high-strength all-light concrete, thereby solving the problem of lightweight aggregate floating when preparing LC60 high-strength all-light concrete. At the same time, it achieves lightness and high strength, and solves the problem of low fluidity of high-strength all-light concrete. The obtained strong all-light concrete has good working performance, reduces the deadweight of high-rise buildings, and can better resist the impact caused by swaying.

[0010] In some embodiments of the invention, the cement comprises P.O.42.5 grade cement.

[0011] In some embodiments of the present invention, the mineral powder includes S95 grade mineral powder.

[0012] In some embodiments of the present invention, the fly ash comprises Class II fly ash.

[0013] In some embodiments of the present invention, the apparent density of the ceramic sand is 920 kg / m 3 The bulk density of the ceramic sand is 523 kg / m 3 The compound fineness of the ceramic sand is 2.5 to 3.1.

[0014] In some embodiments of the present invention, the apparent density of the shale ceramsite is 1090 kg / m 3 .

[0015] In some embodiments of the present invention, the bulk density of the shale ceramsite is 698 kg / m 3 .

[0016] The coarse aggregate in the present invention is crushed stone type shale ceramsite, and the fine aggregate is ceramic sand, which solves the problem of poor workability and difficulty in pumping of fully lightweight concrete, that is, the present invention obtains a HPMC-added pumpable LC60 high-strength fully lightweight concrete.

[0017] In some embodiments of the present invention, the porosity of the shale ceramsite is 31%.

[0018] In some embodiments of the present invention, the cylinder compressive strength of the shale ceramsite is 6.2 MPa.

[0019] In some embodiments of the present invention, the shale ceramsite has a 1h water absorption rate of 16.2%.

[0020] In some embodiments of the present invention, the particle size of the shale ceramsite is 5 to 16 mm.

[0021] In some embodiments of the present invention, the raw materials for preparing the high-strength all-light concrete further include: polycarboxylate water-reducing agent;

[0022] The water reduction rate of the carboxylic acid water reducer is 25-28%.

[0023] In some embodiments of the present invention, the raw materials for preparing the high-strength all-light concrete further include water.

[0024] In some embodiments of the present invention, the raw materials for preparing the high-strength all-light concrete further include: aminosulfonate, modified wood fiber and silica sol;

[0025] The raw materials for preparing the modified wood fiber include wood fiber, a grafting agent and an initiator.

[0026] In the present invention, the introduction of the grafting agent makes the surface of the wood fiber more hydrophilic, thereby enhancing its compatibility with water-based liquids (such as concrete slurry) and improving the adhesion between the wood fiber and the concrete matrix: the wood fiber treated with grafting polymerization has better dispersibility and stability in concrete, which can effectively reduce shrinkage cracks of concrete and improve tensile strength and durability.

[0027] Wood fibers, through their natural fibrous structure, create air bubbles in the concrete and provide structural support.

[0028] On the one hand, the carboxyl groups (-COOH) on the modified wood fibers react with the amino groups in the aminosulfonate surfactants to form amide bonds, which helps to firmly adsorb the surfactant molecules on the surface of the wood fibers, forming a molecular film that can reduce the pore size of the bubbles in the liquid and make the bubbles more stable. In concrete, it helps to reduce the pore size of the pores in the concrete, reduce the porosity in the concrete, improve the density and impermeability of the concrete, and improve the uniformity, density and durability of the concrete. On the other hand, the surface of the modified wood fibers has amino functional groups, which provide active sites to react with Ca in the cement hydration products. 2+ Ionic bonding helps promote the secondary hydration reaction of cement, which in turn promotes the hardening and strength of concrete.

[0029] Silica sol may form silica-oxygen cluster structures on the surface of modified wood fiber. These clusters may bind to the surface of wood fiber through chemical bonds, forming a silica-oxygen cluster protective layer. They can play the following roles: 1. Help prevent the decomposition and destruction of wood fiber in concrete, improving its stability and durability in concrete; 2. Silica-oxygen clusters bind to silicates on the surface of cement particles, increasing the dispersibility of cement particles and promoting contact between cement particles and water; 3. The interaction between silica sol and the surface of cement particles helps promote the secondary hydration reaction of cement and release metal ions, such as calcium ions (Ca). 2+ ), chemically reacting with the hydrates in the cement, such as calcium ions reacting with the silicates and water in the cement to form more CSH gel. This helps to enhance the mechanical properties and durability of the cement and improve the overall performance of the concrete.

[0030] Silica sol may form silica-oxygen cluster structures on the surface of modified wood fibers. These silica-oxygen clusters may combine with silicates on the surface of cement particles, increasing the dispersibility of cement particles and promoting contact between cement particles and water, thereby promoting the secondary hydration reaction of cement. The reaction products may contain metal ions, such as calcium ions (Ca2+) and aluminum ions (Al3+). These metal ions may chemically react with hydrates in cement, promoting the secondary hydration reaction of cement. When calcium ions react with silicates and water in cement, the amount of CSH gel produced increases. CSH gel is one of the main components of cement hydration products and plays a key role in the cement hardening process. Therefore, the addition of calcium ions may promote the formation of more CSH gel, which can enhance the mechanical properties and durability of cement-based materials.

[0031] In some embodiments of the present invention, the sulfamate salt comprises at least one of sodium sulfamate and potassium sulfamate.

[0032] In some embodiments of the present invention, the silica sol comprises a nano-scale silica sol aqueous solution, and the particle size of the silica sol is 10-30 nm.

[0033] In some embodiments of the present invention, the grafting agent includes at least one of methacrylic acid, acrylic acid, acryloyl chloride, vinylacyl chloride silane, and acrylamide.

[0034] In some embodiments of the present invention, the initiator comprises at least one of ammonium persulfate and potassium persulfate.

[0035] According to a second aspect of the present invention, a method for preparing high-strength all-light concrete is proposed, comprising the following steps: mixing raw materials for preparing the high-strength all-light concrete, stirring, and then pouring.

[0036] In some embodiments of the present invention, the method for preparing the modified wood fiber comprises: mixing and reacting the wood fiber, the grafting agent, and the initiator.

[0037] According to a third aspect of the present invention, an application of the high-strength all-light concrete in high-rise buildings is proposed. DETAILED DESCRIPTION

[0038] The terms "preferably," "more preferably," and the like, used herein refer to embodiments of the present invention that may provide certain benefits under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the present invention.

[0039] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein are understood to include any and all subranges subsumed therein.

[0040] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of the present invention.

[0041] Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0042] The raw materials used in the following implementation cases are as follows:

[0043] The cement used was P.O42.5 cement produced by Hunan Conch Cement Co., Ltd., with a density of 3.10 g / cm3, a specific surface area of ​​315 m2 / kg, and a 28-day strength of 48.6 MPa.

[0044] The mineral powder is S95 grade mineral powder produced by Hunan Helong Building Materials Co., Ltd., with a 28-day activity index of 105%, a density of 2.91g / cm3, and a specific surface area of ​​425m2 / kg;

[0045] The fly ash was Grade II fly ash produced by Yiyang Xingtai Building Materials Co., Ltd., with a fineness of 19%, a water requirement ratio of 96%, and a 28-day activity index of 76%.

[0046] The admixture is a high-performance polycarboxylate water-reducing agent from Sika (China) Co., Ltd., with a solid content of 24.8% and a water reduction rate of 26.7%;

[0047] The water is tap water;

[0048] The apparent density of coarse aggregate shale ceramsite is 1090kg / m3, the bulk density is 698kg / m3, the porosity is 31%, the cylinder pressure strength is 6.2Mpa, the 1h water absorption rate is 16.2%, and the particle size is 5-16mm; the apparent density is 920kg / m3, the bulk density is 523kg / m3, the compound fineness is 2.5-3.1, continuous extreme matching, and the particle shape is good.

[0049] Example 1

[0050] This embodiment provides high-strength, fully lightweight concrete and a preparation method thereof, specifically:

[0051] A high-strength all-light concrete is prepared from the following raw materials: 540 kg of cement, 100 kg of mineral powder, 55 kg of fly ash, 360 kg of shale ceramsite, 82 kg of water, 68 kg of 3.5‰ HPMC solution, and 21.5 kg of admixtures per cubic meter of concrete.

[0052] A method for preparing high-strength all-light concrete, comprising the following specific steps:

[0053] S1: Mix cement, mineral powder, fly ash and shale ceramsite in proportion to form a mixture;

[0054] S2: Gradually add HPMC solution and admixtures to the mixture and stir until the mixture is uniform;

[0055] S3: Slowly add water and continue stirring for 3 hours to ensure that the various components in the mixture are fully mixed and reacted to obtain a slurry;

[0056] S4: Pour the mixed slurry into the mold, and perform compaction and curing.

[0057] Example 2

[0058] This embodiment provides high-strength, fully lightweight concrete and a preparation method thereof, specifically:

[0059] A high-strength all-light concrete is prepared from the following raw materials: 530 kg of cement, 100 kg of mineral powder, 50 kg of fly ash, 460 kg of shale ceramsite, 82 kg of water, 68 kg of 3.5‰ HPMC solution, and 21.5 kg of admixtures per cubic meter of concrete.

[0060] A method for preparing high-strength all-light concrete, comprising the following specific steps:

[0061] S1: Mix cement, mineral powder, fly ash and shale ceramsite in proportion to form a mixture;

[0062] S2: Gradually add HPMC solution and admixtures to the mixture and stir until the mixture is uniform;

[0063] S3: Slowly add water and continue stirring for 3 hours to ensure that the various components in the mixture are fully mixed and reacted to obtain a slurry;

[0064] S4: Pour the mixed slurry into the mold, and perform compaction and curing.

[0065] Example 3

[0066] This embodiment provides high-strength, fully lightweight concrete and a preparation method thereof, specifically:

[0067] A high-strength all-light concrete is prepared from the following raw materials: 500 kg of cement, 110 kg of mineral powder, 55 kg of fly ash, 360 kg of shale ceramsite, 82 kg of water, 68 kg of 3.5‰ HPMC solution, and 21.5 kg of admixtures per cubic meter of concrete.

[0068] A method for preparing high-strength all-light concrete, comprising the following specific steps:

[0069] S1: Mix cement, mineral powder, fly ash and shale ceramsite in proportion to form a mixture;

[0070] S2: Gradually add HPMC solution and admixtures to the mixture and stir until the mixture is uniform;

[0071] S3: Slowly add water and continue stirring for 3 hours to ensure that the various components in the mixture are fully mixed and reacted to obtain a slurry;

[0072] S4: Pour the mixed slurry into the mold, and perform compaction and curing.

[0073] Example 4

[0074] This embodiment provides high-strength, fully lightweight concrete and a preparation method thereof, specifically:

[0075] A high-strength all-light concrete is prepared from the following raw materials: 500 kg of cement, 110 kg of mineral powder, 55 kg of fly ash, 500 kg of shale ceramsite, 82 kg of water, 68 kg of 3.5‰ HPMC solution, and 21.5 kg of admixtures according to the mass of raw materials required for each cubic meter of concrete.

[0076] A method for preparing high-strength all-light concrete, comprising the following specific steps:

[0077] S1: Mix cement, mineral powder, fly ash and shale ceramsite in proportion to form a mixture;

[0078] S2: Gradually add HPMC solution and admixtures to the mixture and stir until the mixture is uniform;

[0079] S3: Slowly add water and continue stirring for 3 hours to ensure that the various components in the mixture are fully mixed and reacted to obtain a slurry;

[0080] S4: Pour the mixed slurry into the mold, and perform compaction and curing.

[0081] Example 5

[0082] This embodiment provides high-strength, fully lightweight concrete and a preparation method thereof, specifically:

[0083] A high-strength all-light concrete is prepared from the following raw materials: 500 kg of cement, 110 kg of mineral powder, 55 kg of fly ash, 360 kg of shale ceramsite, 82 kg of water, 68 kg of 3.5‰ HPMC solution, 21.5 kg of admixture, 0.2 kg of aminosulfonate, 1.5 kg of modified wood fiber, and 1 kg of silica sol, according to the mass of raw materials required for each cubic meter of concrete.

[0084] A method for preparing high-strength all-light concrete, comprising the following specific steps:

[0085] S1: Mix cement, mineral powder, fly ash and shale ceramsite in proportion to form a mixture;

[0086] S2: Gradually add HPMC solution and admixtures to the mixture and stir until the mixture is uniform;

[0087] S3: slowly add water, sulfamate, modified wood fiber and silica sol, and continue stirring for 3 hours to ensure that the various components in the mixture are fully mixed and reacted to obtain a slurry;

[0088] S4: Pour the mixed slurry into the mold, and perform compaction and curing.

[0089] The preparation method of modified wood fiber is as follows:

[0090] A1: Wash and dry the wood fiber;

[0091] A2: Place the dried wood fiber in a reaction vessel, add ammonium persulfate (APS) as an initiator, inject methacrylic acid solution into the reaction vessel to ensure that the wood fiber is completely soaked, and perform a polymerization reaction at 80°C to obtain modified wood fiber.

[0092] Example 6

[0093] This embodiment provides high-strength, fully lightweight concrete and a preparation method thereof, specifically:

[0094] A high-strength all-light concrete is prepared from the following raw materials: 500 kg of cement, 110 kg of mineral powder, 55 kg of fly ash, 360 kg of shale ceramsite, 82 kg of water, 68 kg of 3.5‰ HPMC solution, 21.5 kg of admixture, 0.2 kg of sodium sulfamate, 1.5 kg of modified wood fiber, and 1 kg of silica sol, according to the mass of raw materials required for each cubic meter of concrete.

[0095] A method for preparing high-strength all-light concrete, comprising the following specific steps:

[0096] S1: Mix cement, mineral powder, fly ash and shale ceramsite in proportion to form a mixture;

[0097] S2: Gradually add HPMC solution and admixtures to the mixture and stir until the mixture is uniform;

[0098] S3: Slowly add water, aminosulfonate, modified wood fiber and silica sol, and continue stirring for 3 hours to ensure the mixture is

[0099] The various components in the compound are fully mixed and reacted to obtain a slurry;

[0100] S4: Pour the mixed slurry into the mold, and perform compaction and curing.

[0101] The preparation method of modified wood fiber is as follows:

[0102] A1: Wash and dry the wood fiber;

[0103] A2: Place the dried wood fiber in a reaction vessel, add initiator ammonium persulfate (APS), inject acrylic acid solution into the reaction vessel to ensure that the wood fiber is completely soaked, and carry out polymerization reaction at 80°C to obtain modified wood fiber.

[0104] Example 7

[0105] This embodiment provides high-strength, fully lightweight concrete and a preparation method thereof, specifically:

[0106] A high-strength all-light concrete is prepared from the following raw materials: 500 kg of cement, 110 kg of mineral powder, 55 kg of fly ash, 360 kg of shale ceramsite, 82 kg of water, 68 kg of 3.5‰ HPMC solution, 21.5 kg of admixture, 0.2 kg of aminosulfonate, 1.5 kg of modified wood fiber, and 1 kg of silica sol, according to the mass of raw materials required for each cubic meter of concrete.

[0107] A method for preparing high-strength all-light concrete, comprising the following specific steps:

[0108] S1: Mix cement, mineral powder, fly ash and shale ceramsite in proportion to form a mixture;

[0109] S2: Gradually add HPMC solution and admixtures to the mixture and stir until the mixture is uniform;

[0110] S3: Slowly add water, sodium sulfamate, modified wood fiber and silica sol, and continue stirring for 3 hours to ensure the mixture is

[0111] The various components in the compound are fully mixed and reacted to obtain a slurry;

[0112] S4: Pour the mixed slurry into the mold, and perform compaction and curing.

[0113] The preparation method of modified wood fiber is as follows:

[0114] A1: Wash and dry the wood fiber;

[0115] A2: Place the dried wood fiber in a reaction vessel, add initiator ammonium persulfate (APS), inject acrylic acid solution into the reaction vessel to ensure that the wood fiber is completely soaked, and carry out polymerization reaction at 80°C to obtain modified wood fiber.

[0116] Comparative Example 1

[0117] This comparative example provides a high-strength, all-light concrete. The difference between this comparative example and Example 1 is that hydroxypropyl cellulose is not included, and other conditions are the same.

[0118] The tensile strength and durability of this comparative example were reduced.

[0119] Test Case

[0120] The performance tests of the embodiments and comparative examples were carried out, and the results are shown in Table 1:

[0121] Concrete mechanical properties test: The mechanical properties of the concrete modules prepared in each embodiment were tested in accordance with GB / T 50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete";

[0122] Test and calculate the compressive strength of concrete in accordance with Section 6 of the above standard;

[0123] Test and calculate the splitting tensile strength of concrete in accordance with Section 9 of the above standard;

[0124] Table 1 Test results

[0125]

[0126] It can be seen from the above embodiments and comparative examples that in the present invention, the introduction of the grafting agent makes the surface of the wood fiber more hydrophilic, thereby enhancing its compatibility with water-based liquids (such as concrete slurry) and improving the adhesion between the wood fiber and the concrete matrix: the wood fiber treated with grafting polymerization has better dispersibility and stability in concrete, which can effectively reduce shrinkage cracks of concrete and improve tensile strength and durability.

[0127] Wood fibers, through their natural fibrous structure, create air bubbles in the concrete and provide structural support.

[0128] On the one hand, the carboxyl groups (-COOH) on the modified wood fibers react with the amino groups in the aminosulfonate surfactants to form amide bonds, which helps to firmly adsorb the surfactant molecules on the surface of the wood fibers, forming a molecular film that can reduce the pore size of the bubbles in the liquid and make the bubbles more stable. In concrete, it helps to reduce the pore size of the pores in the concrete, reduce the porosity in the concrete, improve the density and impermeability of the concrete, and improve the uniformity, density and durability of the concrete. On the other hand, the surface of the modified wood fibers has amino functional groups, which provide active sites to react with Ca in the cement hydration products. 2+ Ionic bonding helps promote the secondary hydration reaction of cement, which in turn promotes the hardening and strength of concrete.

[0129] Silica sol may form silica-oxygen cluster structures on the surface of modified wood fiber. These clusters may bind to the surface of wood fiber through chemical bonds, forming a silica-oxygen cluster protective layer. They can play the following roles: 1. Help prevent the decomposition and destruction of wood fiber in concrete, improving its stability and durability in concrete; 2. Silica-oxygen clusters bind to silicates on the surface of cement particles, increasing the dispersibility of cement particles and promoting contact between cement particles and water; 3. The interaction between silica sol and the surface of cement particles helps promote the secondary hydration reaction of cement and release metal ions, such as calcium ions (Ca). 2+ ), chemically reacting with the hydrates in the cement, such as calcium ions reacting with the silicates and water in the cement to form more CSH gel. This helps to enhance the mechanical properties and durability of the cement and improve the overall performance of the concrete.

[0130] Silica sol may form silica cluster structures on the surface of modified wood fiber. These silica clusters may combine with silicates on the surface of cement particles, increase the dispersibility of cement particles, promote the contact between cement particles and water, and thus promote the secondary hydration reaction of cement. The reaction products may contain metal ions, such as calcium ions (Ca 2+), aluminum ions (Al3+), etc. These metal ions may chemically react with hydrates in cement, promoting secondary hydration of cement. When calcium ions react with silicates and water in cement, the production of CSH gel increases. CSH gel is one of the main components of cement hydration products and plays a key role in the cement hardening process. Therefore, the addition of calcium ions may promote the formation of more CSH gel, which can enhance the mechanical properties and durability of cement-based materials.

[0131] The present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. In addition, the embodiments of the present invention and the features thereof may be combined with each other without conflict.

Claims

1. A high-strength all-light concrete, characterized in that: The raw materials for preparation include, by weight: 500-540 parts of cement, 90-110 parts of mineral powder, 50-60 parts of fly ash, 300-500 parts of pottery sand, 350-380 parts of shale ceramsite and 60-70 parts of hydroxypropyl cellulose; The raw materials for preparing the high-strength all-light concrete also include: aminosulfonate, modified wood fiber and silica sol; The raw materials for preparing the modified wood fiber include: wood fiber, grafting agent and initiator; The silica sol includes a nano-scale silica sol aqueous solution, and the particle size of the silica sol is 10-30 nm; The grafting agent includes at least one of methacrylic acid, acrylic acid, acryloyl chloride, vinyl chloride silane and acrylamide.

2. The high-strength all-light concrete according to claim 1, characterized in that: The cement comprises P.O42.5 grade cement.

3. The high-strength all-light concrete according to claim 1, characterized in that: The raw materials for preparing the high-strength all-light concrete also include: polycarboxylate water reducer; The water reduction rate of the carboxylic acid water reducer is 25-28%.

4. The high-strength all-light concrete according to claim 1, characterized in that: The initiator includes at least one of ammonium persulfate and potassium persulfate.

5. A method for preparing high-strength all-light concrete according to any one of claims 1 to 4, characterized in that: The following steps are involved: The raw materials for preparing the high-strength all-light concrete are mixed, stirred and then poured.

6. The method for preparing high-strength all-light concrete according to claim 5, characterized in that: The preparation method of the modified wood fiber comprises: mixing and reacting the wood fiber, the grafting agent and the initiator.

7. Use of the high-strength, all-light concrete according to any one of claims 1 to 4 in high-rise buildings.

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