Lightweight high-strength concrete and preparation method thereof

Abstract

The invention discloses light high-strength concrete and a preparation method thereof. The lightweight high-strength concrete comprises a dry powder material and a liquid material, wherein the dry powder material comprises the following components in parts by weight: 490-515 parts of cement, 280-305 parts of mineral powder, 40-45 parts of silica fume, 300-320 parts of first lightweight aggregate, 255-340 parts of second lightweight aggregate and 0-200 parts of gravel aggregate. Wherein the first lightweight aggregate has a first particle size specification. The second lightweight aggregate has a second particle size specification, and the second particle size specification is larger than the first particle size specification. The gravel aggregate has a third particle size specification which is larger than the first particle size specification. The liquid material comprises the following components in parts by weight: 200-240 parts of water and 4-10 parts of a water reducing agent. The lightweight high-strength concrete provided by the invention has low density and high strength at the same time, the flowability of gelled slurry is improved by adjusting the use amounts of the cement, the mineral powder and the silica fume, and a lightweight aggregate pre-wetting process or a non-pre-wetting process can be adopted, so that the lightweight high-strength concrete is wide in application range.

Description

Technical Field

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

[0002] As a commonly used material in construction projects, the strength and quality of concrete are directly related to the safety and durability of the project. Traditional concrete has met the needs of engineering construction to a certain extent, but with the continuous development of prefabricated buildings, considering the actual needs of transportation and hoisting of prefabricated concrete components, the demand for concrete with both high strength and low density has become urgent.

[0003] Most lightweight concrete on the market today has relatively low strength in pursuit of lightweight. In addition, the production process is complicated, requiring pre-wetting of lightweight aggregates and placing high demands on equipment, which greatly limits its engineering application.

[0004] Therefore, there is a need for a lightweight and high-strength concrete and a preparation method thereof to at least partially solve the above problems. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problems, the first aspect of the present application provides a lightweight high-strength concrete, wherein the lightweight high-strength concrete comprises a dry powder material and a liquid material.

[0007] The proportion of the dry powder is:

[0008] Cement, 490-515 parts by weight,

[0009] Mineral powder, 280-305 parts by weight,

[0010] Silica fume, 40-45 parts by weight,

[0011] The first lightweight aggregate is 300 to 320 parts by weight, wherein the first lightweight aggregate has a first particle size specification,

[0012] A second lightweight aggregate, 255 to 340 parts by weight, wherein the second lightweight aggregate has a second particle size specification, and the second particle size specification is larger than the first particle size specification,

[0013] Crushed stone aggregate, 0 to 200 parts by weight, wherein the crushed stone aggregate has a third particle size specification,

[0014] The third particle size specification is larger than the first particle size specification;

[0015] The proportion of the liquid material is:

[0016] Water, 200-240 parts by weight,

[0017] Water reducing agent, 4 to 10 parts by weight.

[0018] The lightweight high-strength concrete according to the present application has both low density and high strength, and the fluidity of the cementitious slurry is improved by adjusting the dosage of cement, mineral powder and silica fume, and both the lightweight aggregate pre-wetting process and the non-pre-wetting process can be adopted, so the application range is wide.

[0019] Optionally, the first particle size specification is less than 5 mm.

[0020] Optionally, the second particle size specification is 5 to 10 mm; or

[0021] The second particle size specification is 5 to 20 mm.

[0022] Optionally, the third particle size specification is 5 to 10 mm; or

[0023] The third particle size specification is 5 to 20 mm.

[0024] Optionally, the third particle size specification is the same as the second particle size specification.

[0025] Optionally, the apparent density of the first lightweight aggregate is 1100-1200 kg / m 3 The 1h water absorption rate of the first lightweight aggregate is 8-9%.

[0026] Optionally, when the second particle size specification is 5-10 mm, the apparent density of the second lightweight aggregate is 1000-1100 kg / m 3 , the 1h water absorption rate of the second lightweight aggregate is 6-7%, and the cylinder compressive strength of the second lightweight aggregate is 2MPa-3MPa;

[0027] When the second particle size specification is 5-20 mm, the apparent density of the second lightweight aggregate is 950-1050 kg / m 3 The 1h water absorption rate of the second lightweight aggregate is 5.5-6.5%, and the cylinder compressive strength of the second lightweight aggregate is 2MPa-3MPa.

[0028] Optionally, the first lightweight aggregate and / or the second lightweight aggregate includes lightweight shale aggregate.

[0029] Optionally, the cement is graded as 52.5PII; and / or

[0030] The mineral powder is labeled S95; and / or

[0031] The water reducer is a polycarboxylate water reducer.

[0032] The second aspect of the present application provides a preparation method for preparing the lightweight high-strength concrete described in the first aspect, the preparation method comprising the following steps:

[0033] A step of mixing dry powder;

[0034] A liquid material mixing step;

[0035] A gel slurry forming step, mixing the dry powder material and the liquid material to form a gel slurry;

[0036] The pouring and curing step is to pour and cure the cementitious slurry to form the lightweight high-strength concrete.

[0037] Optionally, the step of mixing dry powder further includes a pre-wetting step, wherein the pre-wetting step includes: soaking the first lightweight aggregate and the second lightweight aggregate in water for a predetermined time and then performing surface drying;

[0038] The step of forming a gelled slurry comprises: adding the liquid material into the dry powder material at one time and stirring.

[0039] Optionally, the step of forming a gelled slurry comprises:

[0040] Take a portion of the liquid material and add it to the dry powder material for the first stirring;

[0041] Add the remaining liquid material and stir for the second time.

[0042] According to the preparation method of the present application, the lightweight aggregate can be pre-wetted or not, the application range is wide, and the prepared concrete has both low density and high strength. DETAILED DESCRIPTION

[0043] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of the components, features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other components, features, wholes, steps, operations, elements, components and / or combinations thereof.

[0045] Ordinal numbers such as “first” and “second” cited in the present application are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term “first component” itself does not imply the existence of the “second component”, and the term “second component” itself does not imply the existence of the “first component”.

[0046] The first aspect of the present application provides a lightweight high-strength concrete. It includes dry powder and liquid. The dry powder ratio is 490 to 515 parts by weight of cement, 280 to 305 parts by weight of mineral powder, 40 to 45 parts by weight of silica fume, 300 to 320 parts by weight of a first lightweight aggregate, 255 to 340 parts by weight of a second lightweight aggregate, and 0 to 200 parts by weight of crushed stone aggregate. The first lightweight aggregate has a first particle size specification, the second lightweight aggregate has a second particle size specification, and the second particle size specification is larger than the first particle size specification. The crushed stone aggregate has a third particle size specification, and the third particle size specification is larger than the first particle size specification. The liquid ratio is 200 to 240 parts by weight of water and 4 to 10 parts by weight of a water reducer.

[0047] The lightweight high-strength concrete according to the present application has both low density and high strength, and the fluidity of the cementitious slurry is improved by adjusting the dosage of cement, mineral powder and silica fume, and both the lightweight aggregate pre-wetting process and the non-pre-wetting process can be adopted, so the application range is wide.

[0048] Among them, the second particle size specification is larger than the first particle size specification, so the first lightweight aggregate can be called lightweight fine aggregate, and the second lightweight aggregate can be called lightweight coarse aggregate.

[0049] Specifically, the first particle size specification is less than 5 mm. That is, the particle size of the first lightweight aggregate is less than 5 mm. Preferably, the apparent density of the first lightweight aggregate is 1100-1200 kg / m 3 The 1h water absorption rate of the first lightweight aggregate is 8-9%. Further preferably, the first lightweight aggregate is lightweight shale aggregate.

[0050] As an implementation form, the second particle size specification is 5-10 mm. In this embodiment, the apparent density of the second lightweight aggregate is 1000-1100 kg / m3 The 1h water absorption rate of the second lightweight aggregate is 6-7%, and the cylinder compressive strength of the second lightweight aggregate is 2MPa-3MPa.

[0051] Alternatively, the second particle size specification is 5 to 20 mm. In this embodiment, the apparent density of the second lightweight aggregate is 950 to 1050 kg / m 3 The 1h water absorption rate of the second lightweight aggregate is 5.5-6.5%, and the cylinder compressive strength of the second lightweight aggregate is 2MPa-3MPa.

[0052] The third particle size specification may be 5 to 10 mm, or may be 5 to 20 mm.

[0053] As a preferred embodiment, the third particle size specification is the same as the second particle size specification, that is, the particle size specifications of the second lightweight aggregate and the crushed stone aggregate are both 5-10 mm, or the particle size specifications of the second lightweight aggregate and the crushed stone aggregate are both 5-20 mm.

[0054] Preferably, the second lightweight aggregate can be lightweight shale aggregate.

[0055] As an implementation form, the cement is graded as 52.5PII, the mineral powder is graded as S95, and the water reducing agent is a polycarboxylic acid water reducing agent. More specifically, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.

[0056] The second aspect of the present application provides a preparation method for preparing the lightweight high-strength concrete of the first aspect. The preparation method comprises the following steps:

[0057] Dry powder mixing step.

[0058] Mixing liquid material step.

[0059] In the step of forming a gel slurry, the dry powder material and the liquid material are mixed to form a gel slurry.

[0060] And a pouring and curing step, in which the cementitious slurry is poured and cured to form a lightweight and high-strength concrete.

[0061] As a form of implementation, the preparation method also includes a material preparation step. Since the technical indicators of lightweight aggregates are difficult to control, after purchasing lightweight aggregates, key indicators such as density, saturated water absorption, 1h water absorption, and moisture content need to be measured to ensure that the material quality is good and meets the requirements.

[0062] In addition, lightweight aggregates have a strong ability to absorb water and will "steal water" from the cementitious paste, which may lead to a faster loss of concrete slump. In addition, the water-cement ratio of the connection surface between lightweight aggregates and the cement substrate is reduced. Although the bonding strength of the connection surface is improved in the short term, it will increase the drying shrinkage cracks of the concrete and is not conducive to the increase in strength in the later stage.

[0063] Therefore, the prior art mostly adopts the pre-wetted lightweight aggregate process, that is, the lightweight aggregate is soaked and moistened in advance, so that the lightweight aggregate will not "grab water" from the cement, which is beneficial to improving the fluidity and workability of the concrete. At the same time, the moisture in the pre-wetted lightweight aggregate will have a return effect on the mud, making the bonding surface between the lightweight aggregate and the cement paste more dense, and the later strength of the concrete will also increase accordingly.

[0064] In an optional embodiment of the present application, the preparation method may also adopt a pre-wetting lightweight aggregate process, in other words, a pre-wetting step is further included before the step of mixing the dry powder. The pre-wetting step includes soaking the first lightweight aggregate and the second lightweight aggregate in water for a predetermined time and then drying the surface. The step of forming a gelled slurry includes taking a portion of the liquid material and adding it to the dry powder for a first stirring, preferably stirring for 1 minute. Then, the remaining liquid material is added for a second stirring, preferably stirring for more than 2 minutes.

[0065] However, pre-wetting lightweight aggregates requires the use of specific machinery and equipment. Ordinary concrete mixing plants do not have the conditions for pre-wetting lightweight aggregates. According to the formula of lightweight high-strength concrete of this application, when the conditions are insufficient, a non-pre-wetting lightweight aggregate preparation method can also obtain lightweight concrete that meets the design strength. In other words, in the step of forming a gelled slurry, the liquid material is added to the dry powder material at one time and stirred, preferably for 1.5 to 2 minutes, so that the slurry is evenly wrapped on the surface of the aggregate and has an oily luster.

[0066] According to the preparation method of the present application, the lightweight aggregate can be pre-wetted or not, the application range is wide, and the prepared concrete has both low density and high strength.

[0067] The present application will be described in more detail below with reference to embodiments and comparative examples.

[0068] Example 1

[0069] Dry powder: 504 parts by weight of cement, 294 parts by weight of mineral powder, 42 parts by weight of silica fume, 310 parts by weight of a first lightweight aggregate with a specification of 0 to 5 mm, and 332 parts by weight of a second lightweight aggregate with a specification of 5 to 10 mm.

[0070] Liquid material: 228 parts by weight of water, 6.72 parts by weight of water reducing agent.

[0071] According to the above process steps, the dry powder material and the liquid material are mixed to form a gelled slurry and then poured and cured.

[0072] The concrete strength and dry apparent density were tested after curing for 3, 7 and 28 days.

[0073] Example 2

[0074] It is basically the same as Example 1, except that:

[0075] Water reducing agent 7.56 parts by weight.

[0076] Example 3

[0077] It is basically the same as Example 1, except that:

[0078] 265 parts by weight of the second lightweight aggregate with a specification of 5 to 10 mm and 193 parts by weight of crushed stone aggregate with a specification of 5 to 10 mm.

[0079] Example 4

[0080] It is basically the same as Example 3, except that the water reducing agent is 7.56 parts by weight.

[0081] Example 5

[0082] Dry powder: 494 parts by weight of cement, 284 parts by weight of mineral powder, 42 parts by weight of silica fume, 320 parts by weight of a first lightweight aggregate with a specification of 0 to 5 mm, and 322 parts by weight of a second lightweight aggregate with a specification of 5 to 20 mm.

[0083] Liquid material: 218 parts by weight of water, 5.81 parts by weight of water reducing agent.

[0084] According to the above process steps, the dry powder material and the liquid material are mixed to form a gelled slurry and then poured and cured.

[0085] The concrete strength and dry apparent density were tested after curing for 3, 7 and 28 days.

[0086] Example 6

[0087] It is basically the same as Example 5, except that:

[0088] 255 parts by weight of the second lightweight aggregate with a specification of 5 to 20 mm, and 193 parts by weight of crushed stone aggregate with a specification of 5 to 20 mm.

[0089] Example 7

[0090] Dry powder: 490 parts by weight of cement, 280 parts by weight of mineral powder, 40 parts by weight of silica fume, 320 parts by weight of a first lightweight aggregate with a specification of 0 to 5 mm, and 340 parts by weight of a second lightweight aggregate with a specification of 5 to 10 mm.

[0091] Liquid material: 220 parts by weight of water, 6.48 parts by weight of water reducing agent.

[0092] According to the above process steps, the dry powder material and the liquid material are mixed to form a gelled slurry and then poured and cured.

[0093] The concrete strength and dry apparent density were tested after curing for 3, 7 and 28 days.

[0094] Example 8

[0095] It is basically the same as Example 7, except that:

[0096] 271 parts by weight of the second lightweight aggregate with a specification of 5 to 10 mm, and 200 parts by weight of crushed stone aggregate with a specification of 5 to 10 mm.

[0097] Example 9

[0098] It is basically the same as Example 7, except that:

[0099] 310 parts by weight of the first lightweight aggregate with a specification of 0 to 5 mm and 332 parts by weight of the second lightweight aggregate with a specification of 5 to 10 mm.

[0100] Example 10

[0101] It is basically the same as Example 9, except that:

[0102] 265 parts by weight of the second lightweight aggregate with a specification of 5 to 10 mm and 193 parts by weight of crushed stone aggregate with a specification of 5 to 10 mm.

[0103] Embodiment 11

[0104] Dry powder: 504 parts by weight of cement, 294 parts by weight of mineral powder, 42 parts by weight of silica fume, 300 parts by weight of a first lightweight aggregate with a specification of 0 to 5 mm, and 320 parts by weight of a second lightweight aggregate with a specification of 5 to 10 mm.

[0105] Liquid material: 228 parts by weight of water, 6.72 parts by weight of water reducing agent.

[0106] According to the above process steps, the dry powder material and the liquid material are mixed to form a gelled slurry and then poured and cured.

[0107] The concrete strength and dry apparent density were tested after curing for 3, 7 and 28 days.

[0108] Example 12

[0109] It is basically the same as Example 11, except that:

[0110] 256 parts by weight of the second lightweight aggregate with a specification of 5 to 10 mm and 185 parts by weight of crushed stone aggregate with a specification of 5 to 10 mm.

[0111] Embodiment 13

[0112] Dry powder: 515 parts by weight of cement, 305 parts by weight of mineral powder, 45 parts by weight of silica fume, 300 parts by weight of a first lightweight aggregate with a specification of 0 to 5 mm, and 320 parts by weight of a second lightweight aggregate with a specification of 5 to 10 mm.

[0113] Liquid material: 235 parts by weight of water, 6.92 parts by weight of water reducing agent.

[0114] According to the above process steps, the dry powder material and the liquid material are mixed to form a gelled slurry and then poured and cured.

[0115] The concrete strength and dry apparent density were tested after curing for 3, 7 and 28 days.

[0116] Embodiment 14

[0117] It is basically the same as Example 13, except that:

[0118] 256 parts by weight of the second lightweight aggregate with a specification of 5 to 10 mm and 185 parts by weight of crushed stone aggregate with a specification of 5 to 10 mm.

[0119] Comparative Example 1

[0120] Dry powder: 264 parts by weight of cement, 159 parts by weight of mineral powder, 738 parts by weight of sand with a specification of 0-5 mm, and 1063 parts by weight of crushed stone aggregate with a specification of 5-20 mm.

[0121] Liquid material: 160 parts by weight of water, 10.75 parts by weight of water reducing agent.

[0122] According to the above process steps, the dry powder material and the liquid material are mixed to form a gelled slurry and then poured and cured.

[0123] The concrete strength and dry apparent density were tested after curing for 3, 7 and 28 days.

[0124] Comparative Example 2

[0125] Dry powder: 413 parts by weight of cement, 60 parts by weight of fly ash, 726 parts by weight of sand with a specification of 0-5 mm, and 1061 parts by weight of crushed stone aggregate with a specification of 5-20 mm.

[0126] Liquid material: 165 parts by weight of water, 10.15 parts by weight of water reducing agent.

[0127] According to the above process steps, the dry powder material and the liquid material are mixed to form a gelled slurry and then poured and cured.

[0128] The concrete strength and dry apparent density were tested after curing for 3, 7 and 28 days.

[0129] The amounts of the components used in Examples 1-14 are shown in Table 1 below.

[0130] Table 1

[0131] Example cement Mineral powder Silica Fume First Light Aggregate Second light aggregate Crushed stone aggregate Water reducing agent water Example 1 504 294 42 310 332(5~10mm) 0 6.72 228 Example 2 504 294 42 310 332(5~10mm) 0 7.56 230 Example 3 504 294 42 310 265(5~10mm) 193(5~10mm) 6.72 228 Example 4 504 294 42 310 265(5~10mm) 193(5~10mm) 7.56 228 Example 5 494 284 42 320 322(5~20mm) 0 5.81 218 Example 6 494 284 42 320 255(5~20mm) 193(5~20mm) 5.81 218 Example 7 490 280 40 320 340(5~10mm) 0 6.48 220 Example 8 490 280 40 320 271(5~10mm) 200(5~10mm) 6.48 220 Example 9 490 280 40 310 332(5~10mm) 0 6.48 220 Example 10 490 280 40 310 265(5~10mm) 193(5~10mm) 6.48 220 Embodiment 11 504 294 42 300 320(5~10mm) 0 6.72 228 Example 12 504 294 42 300 256(5~10mm) 185(5~10mm) 6.72 228 Embodiment 13 515 305 45 300 320(5~10mm) 0 6.92 235 Embodiment 14 515 305 45 300 256(5~10mm) 185(5~10mm) 6.92 235

[0132] The dosage of each component of Comparative Examples 1-2 is shown in Table 2 below

[0133] Table 2

[0134] cement Mineral powder Fly ash sand Crushed stone aggregate Water reducing agent water Comparative Example 1 264 159 0 738(0-5mm) 1063(5-20mm) 10.75 160 Comparative Example 2 413 0 60 726(0-5mm) 1061(5-20mm) 10.15 165

[0135] The test results of Examples 1-14 and Comparative Examples 1-2 are shown in Table 3 below.

[0136] Table 3

[0137]

[0138] Combining the above-mentioned Examples 1-14 and Comparative Examples 1-2, it can be seen that by changing the existing concrete that uses all crushed stone aggregates to partially use ordinary crushed stone aggregates and the rest using lightweight aggregates, higher strength is obtained while reducing the density of the concrete. The lightweight aggregate high-strength concrete according to the present application has a density of 1670 kg / m 3 Up to 1750kg / m 3 By increasing the amount of cement, the fluidity of fine stone concrete is improved while ensuring the strength of concrete.

[0139] In addition, according to the lightweight aggregate high-strength concrete of the present application, by adding a portion of mineral powder, the workability of the concrete can be improved, while reducing costs, which is beneficial to protecting the environment and promoting sustainable development; by adding silica fume, the strength, durability and impermeability of the concrete can be further improved, while improving its working performance.

[0140] The processes and steps described in all the above preferred embodiments are only examples. Unless adverse effects occur, various processing operations can be performed in a sequence different from the sequence of the above processes. The sequence of steps in the above processes can also be increased, merged or deleted according to actual needs.

[0141] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present application. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present application. The features described herein in one embodiment may be applied to another embodiment individually or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0142] The present application has been illustrated through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and explanation, and the present application is not limited to the above-mentioned embodiments. According to the teachings of the present application, more variations and modifications can be made, and these variations and modifications all fall within the scope of protection claimed by the present application.

Claims

1. A lightweight high-strength concrete, characterized in that: The lightweight high-strength concrete includes dry powder and liquid. The proportion of the dry powder is: Cement, 490-515 parts by weight, Mineral powder, 280-305 parts by weight, Silica fume, 40-45 parts by weight, The first lightweight aggregate is 300 to 320 parts by weight, wherein the first lightweight aggregate has a first particle size specification, A second lightweight aggregate, 255 to 340 parts by weight, wherein the second lightweight aggregate has a second particle size specification, and the second particle size specification is larger than the first particle size specification, Crushed stone aggregate, 0 to 200 parts by weight, the crushed stone aggregate having a third particle size specification, the third particle size specification being larger than the first particle size specification; The proportion of the liquid material is: Water, 200-240 parts by weight, Water reducing agent, 4 to 10 parts by weight.

2. The lightweight high-strength concrete according to claim 1, characterized in that: The first particle size specification is less than 5 mm.

3. The lightweight high-strength concrete according to claim 1, characterized in that: The second particle size specification is 5 to 10 mm; or The second particle size specification is 5 to 20 mm.

4. The lightweight high-strength concrete according to claim 1, characterized in that: The third particle size specification is 5 to 10 mm; or The third particle size specification is 5 to 20 mm.

5. The lightweight high-strength concrete according to claim 1, characterized in that: The third particle size specification is the same as the second particle size specification.

6. The lightweight high-strength concrete according to claim 2, characterized in that: The apparent density of the first lightweight aggregate is 1100-1200 kg / m 3 The 1h water absorption rate of the first lightweight aggregate is 8-9%.

7. The lightweight high-strength concrete according to claim 3, characterized in that: When the second particle size specification is 5-10 mm, the apparent density of the second lightweight aggregate is 1000-1100 kg / m 3 , the 1h water absorption rate of the second lightweight aggregate is 6-7%, and the cylinder compressive strength of the second lightweight aggregate is 2MPa-3MPa; When the second particle size specification is 5-20 mm, the apparent density of the second lightweight aggregate is 950-1050 kg / m 3 The 1h water absorption rate of the second lightweight aggregate is 5.5-6.5%, and the cylinder compressive strength of the second lightweight aggregate is 2MPa-3MPa.

8. The lightweight high-strength concrete according to claim 1, characterized in that: The first lightweight aggregate and / or the second lightweight aggregate includes lightweight shale aggregate.

9. The lightweight high-strength concrete according to claim 1, characterized in that: The cement is graded as 52.5PII; and / or The mineral powder is labeled S95; and / or The water reducer is a polycarboxylate water reducer.

10. A preparation method for preparing the lightweight high-strength concrete according to any one of claims 1 to 9, characterized in that: The preparation method comprises the following steps: A step of mixing dry powder; A liquid material mixing step; A gel slurry forming step, mixing the dry powder material and the liquid material to form a gel slurry; The pouring and curing step is to pour and cure the cementitious slurry to form the lightweight high-strength concrete.

11. The preparation method according to claim 10, characterized in that: The step of mixing dry powder also includes a pre-wetting step, wherein the pre-wetting step includes: soaking the first lightweight aggregate and the second lightweight aggregate in water for a predetermined time and then surface drying; The step of forming a gelled slurry comprises: adding the liquid material into the dry powder material at one time and stirring.

12. The preparation method according to claim 10, characterized in that: The step of forming a gelled slurry comprises: Take a portion of the liquid material and add it to the dry powder material for the first stirring; Add the remaining liquid material and stir for the second time.

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