Lightweight high-strength concrete and fabricated cable well prepared by using same

Abstract

The application relates to the technical field of building materials, in particular to a light high-strength concrete and an assembled cable well prepared by the light high-strength concrete; the light high-strength concrete comprises the following raw materials in parts by weight: 80-100 parts of Portland cement, 35-45 parts of fine sand, 20-40 parts of coal gangue, 10-20 parts of silica fume, 40-55 parts of ceramsite, 10-15 parts of glass beads, 3-5 parts of polypropylene fiber, 4-6 parts of cocoyl diethanolamide, 0.8-1.5 parts of ammonium stearate, 0.6-1 part of dodecyl dimethyl amine oxide, 5-8 parts of a functional reinforcing agent, 2-5 parts of a water reducing agent and 90-120 parts of water; the concrete provided by the application has high flexural strength, excellent impact resistance and good durability, effectively guarantees the quality of the concrete and prolongs the service life of the concrete; in addition, the assembled cable well provided by the application is assembled in a splicing mode, so that the installation process is simplified, the installation efficiency is improved, the weight is lighter, and the transportation cost is lower.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, specifically to a lightweight, high-strength concrete and prefabricated cable wells made using the same. Background Technology

[0002] With the acceleration of urbanization, the scale of municipal power infrastructure construction is constantly expanding, placing higher demands on the lightweight and high-performance of supporting facilities such as cable wells. Traditional cable wells are mostly made of ordinary concrete or reinforced concrete, which have problems such as heavy weight, difficulty in transportation and installation, and insufficient durability. Lightweight high-strength concrete, due to its excellent mechanical properties and lightweight characteristics, has become an ideal material for solving the above problems.

[0003] In existing technologies, lightweight concrete mainly reduces its density by incorporating lightweight aggregates (such as expanded clay and perlite), but this often leads to a significant decrease in strength. Furthermore, existing lightweight high-strength concrete still suffers from insufficient impact resistance, high brittleness, and insufficient durability when applied to thin-walled precast components such as cable wells. Therefore, this invention provides a lightweight high-strength concrete and its prefabricated cable well to solve the aforementioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a lightweight, high-strength concrete and a prefabricated cable well made therefrom. The concrete provided not only has high flexural strength and excellent impact resistance, but also good durability, effectively ensuring the quality of the concrete while extending its service life. In addition, the prefabricated cable well provided by this invention adopts a splicing assembly form, which not only simplifies the installation process and improves installation efficiency, but also makes it lighter and reduces transportation costs.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A lightweight, high-strength concrete comprises the following raw materials in parts by weight: 80-100 parts silicate cement, 35-45 parts fine sand, 20-40 parts coal gangue, 10-20 parts silica fume, 40-55 parts ceramsite, 10-15 parts glass microspheres, 3-5 parts polypropylene fiber, 4-6 parts cocoyl diethanolamide, 0.8-1.5 parts ammonium stearate, 0.6-1 part dodecyl dimethylamine oxide, 5-8 parts functional enhancer, 2-5 parts water-reducing agent, and 90-120 parts water.

[0007] Furthermore, the preparation method of the functional enhancer is as follows: ethylene glycol methacrylate and the modifier are added to DMF at a dosage ratio of 10-20 g / L and 50-60 g / L respectively. After mixing, nitrogen gas is introduced, and then benzoin dimethyl ether at a mass of 1-1.5% of ethylene glycol methacrylate is added. The mixture is stirred and reacted under ultraviolet irradiation for 1-2 hours. After the reaction is completed, silane coupling agent modified sepiolite fiber at a mass of 0.4-0.6 times that of the modifier is added to the product. After stirring and reacting for 30-60 minutes, methanol is added until the precipitate is completely precipitated. Then, the product is filtered, washed with alcohol, and dried.

[0008] Furthermore, the preparation method of the modifier is as follows:

[0009] Step 1: Add amino-tetraethylene glycol (3.5 to 4 times the molar amount of 1,3,5-tricarboxyphenyl) and acetic acid (5 to 8% by volume of ethanol) to a 0.1 to 0.15 mol / L ethanol solution of 1,3,5-tricarboxyphenyl. After refluxing for 20 to 25 hours, perform post-processing to obtain a solid powder.

[0010] Step 2: Add the solid powder to 1,4-epoxybutane at a solid-liquid ratio of 0.1-0.2 g / mL, add 0.5-0.55 times the mass of the solid powder of ethanethiol acid and 1-1.2 times the mass of EDC·HCl, react at room temperature for 10-20 h, and then perform post-treatment to obtain the modifier.

[0011] Furthermore, the specific post-processing operations in steps one and two are the same, specifically: after the reaction is complete, evaporate the solvent from the product until the precipitate is completely precipitated, then filter out the precipitate and wash it with acetone before drying.

[0012] Furthermore, the preparation method of silane coupling agent modified sepiolite fiber is as follows: acidified sepiolite fiber is uniformly dispersed in 10-20wt% silane coupling agent KH570 hydrolysate at a solid-liquid ratio of 0.05-0.1g / mL, and the reaction is stirred at 40-60℃ for 1-2h. The reaction product is then filtered, washed and dried sequentially.

[0013] The preparation method of silane coupling agent KH570 hydrolysate is as follows: add 10-20% by volume of silane coupling agent KH570 to an 80-90 wt% ethanol aqueous solution, adjust the pH to 4-5 with acetic acid, and then hydrolyze for 50-80 minutes to obtain the solution.

[0014] Furthermore, the preparation method of acidified sepiolite fiber is as follows: the sepiolite fiber is immersed in hydrochloric acid with a concentration of 1.5-2.5 mol / L and kept at 30-40℃ with stirring for 30-50 minutes; after the treatment is completed, the sepiolite fiber is filtered out, washed with water until neutral, and then dried.

[0015] Furthermore, the glass microspheres are hollow glass microspheres with a particle size of 50–60 μm; the ceramsite is selected from shale ceramsite with a continuous gradation of 5–25 mm particle size and a bulk density of 800–850 kg / m³. 3 The water absorption rate is 6-8%; the silicate cement is P.O42.5 ordinary silicate cement; the fine sand is river sand, mountain sand, tailings or stone powder with a fineness modulus of 1.5-2.5; the particle size of the coal gangue is 300-350μm; the silica content in the silica fume is ≥85%, and the average particle size is 0.1-0.2μm.

[0016] Furthermore, the water-reducing agent is selected from any one of PCE-102 polycarboxylate water-reducing agent, PCE-101 polycarboxylate water-reducing agent, and PCE-103 polycarboxylate water-reducing agent.

[0017] Furthermore, the polypropylene fiber has a diameter of 10–12 μm and a length of 10–14 mm; and the sepiolite fiber has a diameter of 30–50 μm and a length of 5–8 mm.

[0018] The present invention also provides a prefabricated cable well, which is made of the aforementioned lightweight high-strength concrete, and the prefabricated cable well consists of a thin-walled bottom plate and a cavity-type thin-walled side plate, both of which are made of lightweight high-strength concrete; wherein,

[0019] The thin-walled base plate is 80mm thick and has pre-embedded anchors at the bottom, with grooves and connection holes on the surface;

[0020] The hollow thin-walled side plate has a specification of (50+50)mm, and its two sides are provided with splicing protrusions and grooves. A circular wire hole is opened on the side plate.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention first acidifies the sepiolite fiber, effectively removing impurities and optimizing its pore structure, laying the foundation for the subsequent preparation of functional reinforcing agents. The acidified sepiolite fiber is then immersed in a hydrolysate of silane coupling agent KH570. Ultimately, the silanol groups on the hydrolyzed silane coupling agent KH570 molecules react chemically with the hydroxyl groups on the sepiolite fiber surface to form silicon-oxygen bonds, thereby chemically bonding the silane coupling agent KH570 to the sepiolite fiber surface, thus obtaining silane coupling agent-modified sepiolite fiber.

[0023] This invention uses 1,3,5-triformoylbenzene, amino-tetraethylene glycol, ethanethiol, and EDC.HCl as raw materials to prepare a reactive modifier with a large molecular chain. Then, the modifier and ethylene glycol methacrylate are added to DMF (dimethyl methacrylate), and under the action of dimethyl benzoate, the ethylene glycol methacrylate and the modifier undergo a chemical reaction to obtain a macromolecular organic compound with a hyperbranched structure. The resulting macromolecular organic compound is then chemically bonded to sepiolite fibers through a silane coupling agent KH570, ultimately yielding a functional reinforcing agent. The prepared functional reinforcing agent is composed of sepiolite fibers and hyperbranched macromolecular organic compounds grafted onto its surface. The synergistic effect of these two components effectively expands the three-dimensional topology of the functional reinforcing agent, increasing the friction between it and the concrete matrix, thereby significantly improving the flexural strength and impact resistance of the concrete. Furthermore, hyperbranched macromolecular organic compounds can form hydrogen bonds or covalent bonds with cement hydration products (such as CSH gel), enhancing interfacial bonding and further improving the mechanical properties of concrete.

[0024] 2. The porous structure of sepiolite fibers buffers the expansion pressure generated by freeze-thaw cycles, while the elasticity of hyperbranched macromolecular organic matter mitigates microcrack propagation. The synergistic effect of these two factors effectively improves the freeze-thaw resistance of concrete. Furthermore, the hydrophobic branches of the hyperbranched macromolecular organic matter reduce the water absorption rate of concrete, block chloride ion and sulfate penetration, and delay steel corrosion. The ion exchange capacity of sepiolite also solidifies chloride ions, further contributing to the synergistic effect of these factors in extending the service life of concrete structures.

[0025] 3. The prefabricated cable manhole provided by this invention adopts a splicing assembly method, which improves installation efficiency. Furthermore, the thickness of the thin-walled base plate in this invention is 80mm, which is 60% less than the traditional 200mm thick concrete cable trench base plate. The hollow thin-walled side plate has a thickness of (50+50)mm, which is 33% less than the traditional 150mm thick concrete cable trench side plate. This results in lower transportation costs, higher installation efficiency, and easier installation for the prefabricated cable manhole provided by this invention. Attached Figure Description

[0026] Figure 1 This is a front view of the assembled cable well in this invention.

[0027] Figure 2 This is an isometric view of the prefabricated cable well in this invention. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] A lightweight high-strength concrete comprises the following raw materials in parts by weight: 80 parts of P.O42.5 ordinary Portland cement, 35 parts of fine sand, 20 parts of coal gangue, 10 parts of silica fume, 40 parts of ceramsite, 10 parts of glass microspheres, 3 parts of polypropylene fiber, 4 parts of cocoyl diethanolamide, 0.8 parts of ammonium stearate, 0.6 parts of dodecyl dimethylamine oxide, 5 parts of functional enhancer, 2 parts of PCE-102 polycarboxylate superplasticizer, and 90 parts of water;

[0031] Among them, the fine sand is river sand with a fineness modulus of 2; the coal gangue has a particle size of 300μm; the silica content in the silica fume is 85%, and the average particle size is 0.1μm;

[0032] The glass microspheres are hollow glass microspheres with a particle size of 50 μm; the ceramsite is selected from shale ceramsite with a continuous gradation of 5 mm particle size and a bulk density of 800 kg / m³. 3 The water absorption rate is 6%;

[0033] The polypropylene fiber has a diameter of 10μm and a length of 10mm; while the sepiolite fiber has a diameter of 30μm and a length of 5mm.

[0034] The preparation method of the functional enhancer is as follows: Ethylene glycol methacrylate and the modifier are added to DMF at a dosage ratio of 10 g / L and 50 g / L respectively. After mixing, nitrogen gas is introduced, and then benzoin dimethyl ether at a mass of 1% of ethylene glycol methacrylate is added. The mixture is stirred and reacted under ultraviolet irradiation for 1 hour. After the reaction is completed, silane coupling agent modified sepiolite fiber at a mass of 0.4 times that of the modifier is added to the product. After stirring and reacting for 30 minutes, methanol is added until the precipitate is completely precipitated. Then, the product is filtered, washed with alcohol, and dried.

[0035] The preparation method of the modifier is as follows:

[0036] Step 1: Add amino-tetraethylene glycol (3.5 times the molar amount of 1,3,5-tricarboxyphenyl) and acetic acid (5% by volume of ethanol) to a 0.1 mol / L ethanol solution of 1,3,5-tricarboxyphenyl. After refluxing for 20 h, perform post-processing to obtain a solid powder.

[0037] Step 2: Add the solid powder to 1,4-epoxybutane at a solid-liquid ratio of 0.1 g / mL, add 0.5 times the mass of ethanethiol and 1 times the mass of EDC·HCl, react at room temperature for 10 h, and then perform post-treatment to obtain the modifier.

[0038] The specific post-processing operations in Step 1 and Step 2 are the same: after the reaction is complete, evaporate the solvent from the product until the precipitate is completely precipitated, then filter out the precipitate and wash it with acetone before drying.

[0039] The preparation method of silane coupling agent modified sepiolite fiber is as follows: acidified sepiolite fiber is uniformly dispersed in 10wt% silane coupling agent KH570 hydrolysate at a solid-liquid ratio of 0.05g / mL. After stirring and reacting at 40℃ for 1h, the reaction product is filtered, washed and dried in sequence. The preparation method of silane coupling agent KH570 hydrolysate is as follows: 10% by volume of silane coupling agent KH570 is added to 80wt% ethanol aqueous solution, the pH is adjusted to 4 with acetic acid and hydrolyzed for 60min.

[0040] The preparation method of acidified sepiolite fiber is as follows: the sepiolite fiber is immersed in hydrochloric acid with a concentration of 1.5 mol / L and kept at 30°C with stirring for 30 min; after the treatment is completed, the sepiolite fiber is filtered out, washed with water until neutral, and then dried.

[0041] A prefabricated cable well is made of lightweight, high-strength concrete, and the prefabricated cable well consists of a thin-walled bottom plate and hollow thin-walled side plates, both of which are made of lightweight, high-strength concrete; wherein,

[0042] The thin-walled base plate is 80mm thick and has pre-embedded anchors at the bottom, with grooves and connection holes on the surface;

[0043] The hollow thin-walled side plate has a specification of (50+50)mm, and its two sides are provided with splicing protrusions and grooves. A circular wire hole is opened on the side plate.

[0044] Example 2

[0045] The prefabricated cable well provided in this embodiment is basically the same as that in Embodiment 1, except that the specific composition of the concrete used in the prefabricated cable well and the preparation method of the functional enhancer are not exactly the same. The specific composition of the concrete used in the prefabricated cable well and the preparation method of the functional enhancer in this embodiment are as follows:

[0046] A lightweight, high-strength concrete comprises the following raw materials in parts by weight: 90 parts of P.O42.5 ordinary Portland cement, 40 parts of fine sand, 30 parts of coal gangue, 15 parts of silica fume, 50 parts of ceramsite, 10 parts of glass microspheres, 4 parts of polypropylene fiber, 5 parts of cocoyl diethanolamide, 1.2 parts of ammonium stearate, 0.8 parts of dodecyl dimethylamine oxide, 6 parts of functional enhancer, 3 parts of PCE-101 polycarboxylate superplasticizer, and 100 parts of water.

[0047] The preparation method of the functional enhancer is as follows: Ethylene glycol methacrylate and the modifier are added to DMF at a dosage ratio of 15 g / L and 55 g / L respectively. After mixing, nitrogen gas is introduced, and then benzoin dimethyl ether at a mass of 1.2% of ethylene glycol methacrylate is added. The mixture is stirred and reacted under ultraviolet irradiation for 2 hours. After the reaction is completed, silane coupling agent modified sepiolite fiber at a mass of 0.5 times that of the modifier is added to the product. After stirring and reacting for 40 minutes, methanol is added until the precipitate is completely precipitated. The product is then filtered, washed with alcohol, and dried.

[0048] The preparation method of the modifier is as follows:

[0049] Step 1: Add amino-tetraethylene glycol (4 times the molar amount of 1,3,5-tricarboxyphenyl) and acetic acid (6% by volume of ethanol) to a 0.15 mol / L ethanol solution of 1,3,5-tricarboxyphenyl. After refluxing for 20 h, perform post-processing to obtain a solid powder.

[0050] Step 2: Add the solid powder to 1,4-epoxybutane at a solid-liquid ratio of 0.15 g / mL, and add 0.5 times the mass of ethanethiol and 1.1 times the mass of EDC·HCl. After reacting at room temperature for 15 h, perform post-treatment to obtain the modifier.

[0051] The specific post-processing operations in Step 1 and Step 2 are the same: after the reaction is complete, evaporate the solvent from the product until the precipitate is completely precipitated, then filter out the precipitate and wash it with acetone before drying.

[0052] The preparation method of silane coupling agent modified sepiolite fiber is as follows: acidified sepiolite fiber is uniformly dispersed in 15wt% silane coupling agent KH570 hydrolysate at a solid-liquid ratio of 0.08g / mL. After stirring and reacting at 50℃ for 2h, the reaction product is filtered, washed and dried in sequence.

[0053] The preparation method of acidified sepiolite fiber is as follows: the sepiolite fiber is immersed in hydrochloric acid with a concentration of 2 mol / L and 10 times its weight, and then kept at 35°C and stirred for 40 min; after the treatment is completed, the sepiolite fiber is filtered out, washed with water until neutral, and then dried.

[0054] Example 3

[0055] The prefabricated cable well provided in this embodiment is basically the same as that in Embodiment 1, except that the specific composition of the concrete used in the prefabricated cable well and the preparation method of the functional enhancer are not exactly the same. The specific composition of the concrete used in the prefabricated cable well and the preparation method of the functional enhancer in this embodiment are as follows:

[0056] A lightweight, high-strength concrete comprises the following raw materials in parts by weight: 100 parts of P.O42.5 ordinary Portland cement, 45 parts of fine sand, 40 parts of coal gangue, 20 parts of silica fume, 55 parts of ceramsite, 15 parts of glass microspheres, 5 parts of polypropylene fiber, 6 parts of cocoyl diethanolamide, 1.5 parts of ammonium stearate, 1 part of dodecyl dimethylamine oxide, 8 parts of functional enhancer, 5 parts of PCE-103 polycarboxylate superplasticizer, and 120 parts of water.

[0057] The preparation method of the functional enhancer is as follows: Ethylene glycol methacrylate and the modifier are added to DMF at a dosage ratio of 20 g / L and 60 g / L respectively. After mixing, nitrogen gas is introduced, and then benzoin dimethyl ether at a mass of 1.5% of ethylene glycol methacrylate is added. The mixture is stirred and reacted under ultraviolet irradiation for 2 hours. After the reaction is completed, silane coupling agent modified sepiolite fiber at a mass of 0.6 times that of the modifier is added to the product. After stirring and reacting for 60 minutes, methanol is added until the precipitate is completely precipitated. Then, the product is filtered, washed with alcohol, and dried.

[0058] The preparation method of the modifier is as follows:

[0059] Step 1: Add amino-tetraethylene glycol (4 times the molar amount of 1,3,5-tricarboxyphenyl) and acetic acid (8% by volume of ethanol) to a 0.15 mol / L ethanol solution of 1,3,5-tricarboxyphenyl. After refluxing for 25 h, perform post-processing to obtain a solid powder.

[0060] Step 2: Add the solid powder to 1,4-epoxybutane at a solid-liquid ratio of 0.2 g / mL, and add 0.55 times the mass of ethanethiol and 1.2 times the mass of EDC·HCl, respectively. After reacting at room temperature for 20 h, perform post-treatment to obtain the modifier.

[0061] The specific post-processing operations in Step 1 and Step 2 are the same: after the reaction is complete, evaporate the solvent from the product until the precipitate is completely precipitated, then filter out the precipitate and wash it with acetone before drying.

[0062] The preparation method of silane coupling agent modified sepiolite fiber is as follows: acidified sepiolite fiber is uniformly dispersed in 20wt% silane coupling agent KH570 hydrolysate at a solid-liquid ratio of 0.1g / mL. After stirring and reacting at 60℃ for 2h, the reaction product is filtered, washed and dried in sequence.

[0063] The preparation method of acidified sepiolite fiber is as follows: the sepiolite fiber is immersed in hydrochloric acid with a concentration of 2.5 mol / L and 10 times its weight, and then kept at 40°C and stirred for 50 min; after the treatment is completed, the sepiolite fiber is filtered out, washed with water until neutral, and then dried.

[0064] Comparative Example 1: The difference from Example 1 is that an equal amount of acidified sepiolite fiber of the same specification is used in this comparative example to replace the functional reinforcing agent.

[0065] Comparative Example 2: The difference from Example 1 is that an equal amount of un-acidified sepiolite fiber of the same specification was used to replace the acidified sepiolite fiber in the preparation of the functional enhancer.

[0066] Performance testing:

[0067] The relevant properties of the lightweight high-strength concrete provided in Examples 1-3 and Comparative Examples 1-2 were tested respectively, and the test data are recorded in the table below:

[0068]

[0069] By comparing and analyzing the relevant data in the table, it can be seen that the concrete provided by this invention not only has high flexural strength and excellent impact resistance, but also good durability, effectively ensuring its quality while extending its service life to a certain extent. This indicates that the technical solution provided by this invention has a broader market prospect and is more suitable for promotion.

[0070] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0071] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A lightweight high-strength concrete, characterized by, The raw materials include 80-100 parts of Portland cement, 35-45 parts of fine sand, 20-40 parts of coal gangue, 10-20 parts of silica fume, 40-55 parts of ceramsite, 10-15 parts of glass beads, 3-5 parts of polypropylene fiber, 4-6 parts of cocoyl diethanolamide, 0.8-1.5 parts of ammonium stearate, 0.6-1 part of dodecyl dimethyl amine oxide, 5-8 parts of functional enhancer, 2-5 parts of water reducing agent and 90-120 parts of water; The preparation method of the functional enhancer is as follows: glycol methacrylate and modifier are respectively added into DMF at a use amount ratio of 10-20 g / L and 50-60 g / L, mixed uniformly, and then nitrogen is introduced; 1-1.5% of benzoin dimethyl ether in terms of the mass of glycol methacrylate is added, and stirring reaction is carried out under ultraviolet irradiation for 1-2 h; after the reaction is completed, 0.4-0.6 times of silane coupling agent modified sepiolite fiber in terms of the mass of the modifier is added into the product, stirring reaction is carried out for 30-60 min, then methanol is added until the precipitate is completely precipitated, and then filtration, alcohol washing and drying treatment are carried out. The preparation method of the modifier is as follows: Step one: 1,3,5-triformylbenzene is added into ethanol solution at a molar amount of 3.5-4 times of 1,3,5-triformylbenzene, and acetic acid is added at a volume of 5-8% of ethanol; reflux reaction is carried out for 20-25 h, and then post-treatment is carried out to obtain solid powder; Step two: the solid powder is added into 1,4-dioxane at a solid-liquid ratio of 0.1-0.2 g / mL, and ethanethiol acid and EDC.HCL are added at a mass of 0.5-0.55 times and 1-1.2 times of the solid powder respectively; room temperature reaction is carried out for 10-20 h, and then post-treatment is carried out to obtain the modifier; The post-treatment in the step one and the step two is the same, and the specific operation is as follows: after the reaction is completed, the solvent in the product is evaporated until the precipitate is completely precipitated, then the precipitate is filtered out and washed with acetone, and then drying treatment is carried out; The preparation method of the silane coupling agent modified sepiolite fiber is as follows: acidified sepiolite fiber is uniformly dispersed in 10-20 wt% of silane coupling agent KH570 hydrolysate at a solid-liquid ratio of 0.05-0.1 g / mL, stirring reaction is carried out at a temperature of 40-60℃ for 1-2 h, and then the reaction product is sequentially subjected to filtration, washing and drying treatment. The preparation method of the acidified sepiolite fiber is as follows: sepiolite fiber is immersed in hydrochloric acid at a mass of 8-10 times and a concentration of 1.5-2.5 mol / L, and stirring treatment is carried out at a temperature of 30-40℃ for 30-50 min; after the treatment is completed, the sepiolite fiber is filtered out, washed with water until neutral, and then dried.

2. A lightweight high strength concrete according to claim 1, characterized in that: The glass beads are hollow glass beads, and the particle size thereof is 50-60 μm; the ceramsite is shale ceramsite with a continuous gradation of a particle size of 5-25 mm, and the bulk density and the water absorption rate of the ceramsite are 800-850 kg / m3 and 6-8%, respectively.

3. A lightweight high strength concrete according to claim 1, characterized in that, The water reducing agent is any one of PCE-102 polycarboxylic acid water reducing agent, PCE-101 polycarboxylic acid water reducing agent and PCE-103 polycarboxylic acid water reducing agent.

4. The lightweight high strength concrete as claimed in claim 1, wherein, The diameter of the polypropylene fiber is 10-12 microns, and the length is 10-14 mm; and the diameter of the sepiolite fiber is 30-50 microns, and the length is 5-8 mm.

5. A fabricated cable shaft made of the lightweight high-strength concrete according to any one of claims 1 to 4, characterized in that: The assembled cable well is composed of a thin-wall bottom plate and a cavity-type thin-wall side plate, and both are made of lightweight high-strength concrete; wherein, The thickness of the thin-wall bottom plate is 80 mm, and the bottom is provided with a pre-buried anchoring part, and the surface is provided with a groove and a connecting hole; The specification of the cavity-type thin-wall side plate is (50+50) mm, and both sides are provided with a splicing convex and a groove, and a circular threading hole is formed on the side plate.

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