A high-strength waterproof concrete pole

Abstract

The present invention discloses a high-strength waterproof concrete pole, which belongs to the technical field of concrete materials. The pole comprises high-strength waterproof concrete, a steel skeleton and a waterproof coating applied on the surface of the pole. The high-strength waterproof concrete comprises 750-850 kg / m of cement in terms of mix ratio. 3 Silica fume 130~170kg / m 3 , sand 1000~1300kg / m 3 , Steel fiber 150~250kg / m 3 , water reducing agent 10~15kg / m 3 , water 170~190kg / m 3 and defoaming agent 0.5~1.5kg / m 3 ; A waterproof coating and a defoamer with a multi-arm star polymer as the main component are used to achieve the effect of waterproofing both inside and outside; the defoamer of the present invention has good dispersibility and defoaming performance in concrete, and can also fill some micropores of the concrete to a certain extent.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete materials, and particularly relates to a high-strength waterproof concrete pole. Background Art

[0002] Concrete poles are a widely used tower structure for overhead lines in China. However, due to weaknesses such as low bending strength and heavy weight, ordinary concrete poles have a short service life and require extensive maintenance. Concrete poles are typically precast components made primarily of prestressed steel and concrete, using a pre-tensioned, prestressed centrifugal forming process and steam curing. High-strength concrete, a new cement-based material with excellent mechanical properties, is suitable for use in concrete pole structures.

[0003] However, one of the main challenges facing concrete poles in practical use is corrosion caused by water intrusion, especially in harsh environmental conditions such as areas with high humidity, frequent acid rain, salt spray environments, or frequent freeze-thaw cycles. According to the "2021 Guangdong Province Ecological Environment Bulletin," the average pH value of precipitation in urban Guangdong Province is 5.72, with a pH range of 5.13 (Jiangmen) to 7.04 (Shanwei). The frequency of acid rain is 10.7%, with 15 cities experiencing acid rain (minimum pH < 5.6), and 4 cities experiencing acid rain pollution (average pH < 5.6). In addition to rainwater, when concrete poles are used in low-lying areas, water often accumulates in the buried section of the pole. This water also seeps into the concrete pores on the inner wall of the pole, significantly shortening the service life of the high-voltage poles.

[0004] In various harsh environments, concrete poles are subjected to long-term corrosive media, resulting in cracking of the concrete structure and reduced durability, thus impacting local power transmission projects. Currently, the main methods for waterproofing concrete poles are: 1) Initial waterproofing measures primarily rely on the density of the concrete itself, reducing porosity by optimizing the mix ratio and increasing the cement strength grade. 2) External coating technologies: Materials such as asphalt, polyurethane, and epoxy resins improve the waterproofing of poles to a certain extent, but there are problems such as coating aging, shedding, and potential environmental hazards. 3) With the development of materials science, waterproofing agents (such as silanes, silanols, and polymers) have begun to be incorporated into concrete, significantly improving its impermeability. These waterproofing agents not only fill the micropores within the concrete but also enhance its corrosion resistance to a certain extent. Summary of the Invention

[0005] The present invention provides a high-strength waterproof concrete pole, which adopts a waterproof coating and a defoamer with a multi-arm star polymer as the main component to achieve the function of waterproofing both inside and outside; the defoamer of the present invention has good dispersibility and defoaming performance in concrete, and can also fill some micropores of the concrete to a certain extent.

[0006] The technical solutions for achieving the purpose of the present invention are as follows:

[0007] A high-strength waterproof concrete pole, comprising high-strength waterproof concrete, a steel frame and a waterproof coating applied to the pole surface. The high-strength waterproof concrete, in terms of mix ratio, comprises 750-850 kg / m 3 Silica fume 130~170 kg / m 3 , sand 1000~1300 kg / m 3 , Steel fiber 150~250 kg / m 3 , water reducing agent 10~15 kg / m 3 , water 170~190 kg / m 3 and defoaming agent 0.5~1.5 kg / m 3 ;

[0008] The defoamer comprises, by weight, 40 to 50 parts of a multi-arm star polymer, 1 to 2 parts of an emulsifier and 40 to 50 parts of water;

[0009] The multi-arm star polymer is composed of one initiator molecule and 3 to 8 linear polymer chains;

[0010] The initiating molecule is one or more of a polyamino compound and a polyhydroxy compound modified with a halogenated acyl halide compound;

[0011] The linear polymer chain has the following molecular structure:

[0012] , wherein R is the initiating molecule connected to the linear polymer chain; wherein R1, R2 and R3 are at least one of methyl and hydrogen, and wherein a:b:c=(80~90):(5~10):(5~10).

[0013] Preferably, the co-emulsifier is selected from at least one of polyoxyethylene ether and polysorbate.

[0014] Preferably, the initiating molecule is one or more of glycerol modified with a halogenated acyl halide compound, trimethylolpropane, 1,3,5-triazine-2,4,6-triamine, 1,3,5,7-tetrahydroxyadamantane, dipentaerythritol and hexamethylol melamine.

[0015] More preferably, the initiator molecule has the following molecular structure:

[0016] .

[0017] Specifically, the preparation method of the multi-arm star polymer is as follows:

[0018] S1. Add an initiator, cuprous bromide, and hydrogenated acrylate siloxane monomer to a dry reactor. After adding the solvent, freeze-thaw and degas the mixture three times. Then, under a nitrogen or argon purge, add the ligand N, N, N', N', N''-pentamethyldiethylenetriamine dispersed in anisole. The reaction is carried out at 50-60°C for 2-3 hours. After the reaction is completed, oxygen is introduced in an ice-water bath to terminate the reaction. The mixture is passed through a silica gel column to remove the catalyst, and the filtrate is precipitated in a mixture of methanol and water to obtain a multi-arm star polymer precursor.

[0019] S2. Take a dry reactor and add the multi-arm star polymer precursor, allyl trimethylammonium chloride, and allyl glycidyl ether to a dry toluene solvent. Dissolve the mixture in dry toluene solvent and freeze-thaw for three times to degas. Then, add the Custer catalyst under nitrogen or argon purge. Stir and react at 55-65°C for 2-3 hours. Pass the mixture through a silica gel column to remove the catalyst and solvent to obtain a multi-arm star polymer.

[0020] Preferably, the molar ratio of the initiator molecule in step S1: hydrogenated acrylate siloxane monomer: cuprous bromide: ligand N,N, N', N', N''-pentamethyldiethylenetriamine anisole is 1: (400-600): (4-10): (8-20); and the amount of the Custer catalyst added in step S2 is 0.1-0.3% of the total amount of allyltrimethylammonium chloride and allyl glycidyl ether.

[0021] Preferably, the preparation method of the defoaming agent is as follows:

[0022] 1) After mixing the multi-arm star polymer and the co-emulsifier, heat to 60-80°C and stir at 300-400 rpm for 10-15 minutes to obtain an oil phase;

[0023] 2) Deionized water is heated to 60-80°C, and the oil phase obtained in step 1) is slowly added to the aqueous phase. The mixture is stirred at 1500-2000 rpm for 25-35 minutes while controlling the pH to 6.0-7.5. The mixture is cooled to room temperature to obtain a defoaming agent.

[0024] The present invention also discloses a method for preparing a high-strength waterproof concrete pole, comprising the following steps:

[0025] Mix cement, silica fume and sand according to the mix ratio, stir for 1 to 5 minutes, add water, stir for 2 to 5 minutes, add water reducer, continue stirring for 2 to 10 minutes, then slowly add steel fiber and defoaming agent, continue stirring for 2 to 10 minutes, discharge the material, put the steel skeleton into the mold and cast it, produce it by centrifugal molding process, and cure it by steam curing at normal pressure. After curing, the pole is demoulded and a silicon-based reactive waterproof coating is sprayed on the surface of the pole.

[0026] It should be noted that the defoaming component in the defoamer of the present invention is a multi-arm star polymer containing a cationic quaternary ammonium salt structure. The cement surface is positively charged and the water reducer is negatively charged. Therefore, during use, the water reducer must be added first so that the water reducer can be fully adsorbed on the cement surface through electrostatic attraction to avoid mutual influence between the cationic quaternary ammonium salt structure and the water reducer.

[0027] Beneficial effects

[0028] The present invention has the following beneficial effects: a waterproof coating and a defoamer composed mainly of a multi-arm star polymer are used to achieve both internal and external waterproofing, thereby preparing a high-strength waterproof concrete pole. The defoamer composed mainly of a multi-arm star polymer has the following advantages: 1) The star-shaped topological structure gives the molecule a multi-arm characteristic, increasing the contact area between the molecule and the bubble; the star-shaped structure has a lower viscosity than the linear structure, which is conducive to dispersion and migration; the multi-arm structure provides more contact points for functional groups, improving defoaming efficiency; 2) It contains a large number of Si-H structures, which have a lower surface energy. When the defoamer molecules migrate to the bubble surface, the Si-H groups will preferentially arrange at the gas / liquid interface, reducing the surface tension of the liquid and enhancing the defoaming effect; 3) The epoxy groups of the outer arms, the cationic quaternary ammonium salt structure, and the polar structure of the main chain facilitate the dispersion of the defoamer in the concrete, enhancing compatibility; 4) The epoxy groups of the outer arms can later combine with cement molecules through chemical bonding, filling some of the concrete's micropores to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The diagram is a synthetic route and structural diagram of the multi-arm star polymer of the present invention. DETAILED DESCRIPTION

[0030] 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are all commercially available unless otherwise specified.

[0032] The raw materials and equipment used in the embodiments and comparative examples are described below:

[0033] Cement: Portland cement, PII 52.5R, produced by Zhujiang Cement Plant;

[0034] Silica fume: semi-densified silica fume, SiO2 content 96%, purchased from Sichuan Ewende, 960U;

[0035] Sand: Qingyuan river sand, fineness modulus 2.0~3.0;

[0036] Steel fiber: end hook type steel fiber, SF100 / 60BP, purchased from Bolpais;

[0037] Water reducer: polycarboxylate water reducer, PCA®-Ⅳ, purchased from Jiangsu Subote;

[0038] Water: Guangzhou tap water, in compliance with the requirements of the standard "Concrete Mixing Water" (JGJ 63-2006);

[0039] Prestressed longitudinal steel wire: 12 mm in diameter, brand SWRH72B, purchased from Shagang Steel;

[0040] Longitudinal stress reinforcement: diameter 28 mm, brand HRB500E, purchased from Shagang Steel;

[0041] Spiral ribs: 5 mm in diameter, grade DC01, purchased from Shagang Steel;

[0042] Cold drawn low carbon steel wire: 8 mm in diameter, grade DC01, purchased from Shagang Steel.

[0043] Tween 60: purchased from Aiko Reagent;

[0044] Span 60: purchased from Aiko Reagents;

[0045] Cuprous bromide: 99.9%, purchased from Shanghai Aladdin;

[0046] 2-Bromoisobutyryl bromide: purchased from Shanghai Aladdin;

[0047] Dipentaerythritol: purchased from Shanghai Aladdin;

[0048] N, N, N', N', N''-pentamethyldiethylenetriamine: purchased from Shanghai Aladdin;

[0049] Hydroxyethyl methacrylate: purchased from Shanghai Aladdin;

[0050] Custer catalyst: Pt content 2%, purchased from Shanghai MacLean Biochemical Technology;

[0051] Hexamethylcyclotrisiloxane: purchased from Shanghai Aladdin;

[0052] Dimethyl monochlorosilane: purchased from Shanghai Aladdin;

[0053] Allyltrimethylammonium chloride: purchased from Shanghai Bidex;

[0054] Allyl glycidyl ether: purchased from Eco Reagents;

[0055] Methyl 2-bromoisobutyrate: purchased from Shanghai Aladdin;

[0056] Silicon-based reactive waterproof coating: Beixin Waterproof α-silane modified polymer waterproof coating RAC-101 exposed type.

[0057] Trigger molecules (homemade)

[0058] It is obtained by acylation reaction of dipentaerythritol and 2-bromoisobutyryl bromide, which is a conventional preparation method in the art.

[0059] Hydrogenated acrylate siloxane monomer

[0060] Under argon atmosphere, 1 mol of hexamethylcyclotrisiloxane was placed in a round-bottom flask, 1 mol of dimethylchlorosilane and 50 ml of acetonitrile were added, and then a catalytic amount of dimethylformamide was added. After the mixture was stirred at room temperature for 65 h, the reaction mixture was directly purified by vacuum distillation, and the fractions at 39-41 °C were collected at 1.2 mbar.

[0061] Under a nitrogen atmosphere, at a temperature of 0°C, 2.5 mol of hydroxyethyl methacrylate and 3.0 mol of pyridine were dissolved in dry toluene and added to a reactor. The 1 mol fraction obtained above was dissolved in dry toluene and slowly added dropwise to the reactor. The mixture was stirred for 30 min, heated to 50°C and stirred for 12 h. After completion, the toluene was washed with deionized water, the organic phase was collected, the solvent was removed, and the mixture was purified by column chromatography to obtain a hydrogenated acrylate siloxane monomer.

[0062] Multi-arm star polymer 1

[0063] S1. Add 0.0025 mol of an initiator molecule, 0.01 mol of cuprous bromide, and 1 mol of a hydrogenated acrylate siloxane monomer to a dry reactor. Freeze-thaw and degas the mixture three times. Then, under a nitrogen purge, add a 0.02 mol anisole solution of the ligand N, N, N', N', N''-pentamethyldiethylenetriamine. The reaction is incubated at 55°C for 2 h. After completion, oxygen is introduced in an ice-water bath to terminate the reaction. The mixture is passed through a silica gel column to remove the catalyst, and the filtrate is precipitated in a mixture of methanol and water to obtain a multi-arm star polymer precursor.

[0064] S2. Take a dry reactor and add the multi-arm star polymer precursor obtained above, 0.056 mol of allyl trimethylammonium chloride and 0.056 mol of allyl glycidyl ether dissolved in dry toluene solvent. Freeze-thaw and degas three times. Then, add 1 drop of Custer catalyst under nitrogen purge. Stir and react at 60°C for 3 hours. Pass the mixture through a silica gel column to remove the catalyst and solvent to obtain a multi-arm star polymer. (See attached Figure 1 For the middle molecule, the reaction is carried out based on a accounting for 90%, b accounting for 5%, and c accounting for 5%)

[0065] Multi-arm star polymer 2

[0066] S1. Add 0.00167 mol of initiator molecule, 0.0167 mol of cuprous bromide, and 1 mol of hydrogenated acrylate siloxane monomer to a dry reactor. Freeze-thaw and degas the mixture three times. Then, under a nitrogen purge, add a solution of 0.0334 mol of the ligand N,N, N', N', N''-pentamethyldiethylenetriamine in anisole. The mixture is reacted at 55°C for 2 h. After the reaction is complete, oxygen is introduced in an ice-water bath to terminate the reaction. The mixture is passed through a silica gel column to remove the catalyst, and the filtrate is precipitated in a mixture of methanol and water to obtain a multi-arm star polymer precursor.

[0067] S2. Take a dry reactor and add the multi-arm star polymer precursor obtained above, 0.125 mol of allyltrimethylammonium chloride and 0.125 mol of allyl glycidyl ether dissolved in dry toluene solvent. Freeze-thaw and degas three times. Then, add 2 drops of Custer catalyst under nitrogen purge. Stir and react at 60°C for 3 hours. Pass the mixture through a silica gel column to remove the catalyst and solvent to obtain a multi-arm star polymer. (See attached Figure 1 For the middle molecule, the reaction is carried out according to the ratio of a to 80%, b to 10%, and c to 10%)

[0068] Multi-arm star polymer 3

[0069] S1. Add 0.002 mol of initiator molecule, 0.02 mol of cuprous bromide, and 1 mol of hydrogenated acrylate siloxane monomer to a dry reactor. Freeze-thaw and degas the mixture three times. Then, under an argon purge, add a solution of anisole containing 0.04 mol of the ligand N, N, N', N', N''-pentamethyldiethylenetriamine. The reaction is incubated at 55°C for 2 h. After completion, oxygen is introduced in an ice-water bath to terminate the reaction. The mixture is passed through a silica gel column to remove the catalyst, and the filtrate is precipitated in a mixture of methanol and water to obtain a multi-arm star polymer precursor.

[0070] S2. Take a dry reactor and add the multi-arm star polymer precursor obtained above, 0.095 mol of allyltrimethylammonium chloride and 0.095 mol of allyl glycidyl ether dissolved in dry toluene solvent. Freeze-thaw and degas three times. Then, add 2 drops of Custer catalyst under nitrogen purge. Stir and react at 60°C for 3 hours. Pass the mixture through a silica gel column to remove the catalyst and solvent to obtain a multi-arm star polymer. (See attached Figure 1 For the middle molecule, the reaction is performed based on a accounting for 84%, b accounting for 8%, and c accounting for 8%)

[0071] Multi-arm star polymer 4

[0072] Compared with the preparation method of multi-arm star polymer 3, the difference is that only step S1 is performed. Figure 1 Middle molecule, a=100%, b=0%, c=0%)

[0073] Multi-arm star polymer 5

[0074] Compared with the preparation method of the multi-arm star polymer 3, the difference is that in step S2, 0.095 mol of allyl trimethyl ammonium chloride is replaced by 0.533 mol of allyl trimethyl ammonium chloride, and 0.095 mol of allyl glycidyl ether is replaced by 0.133 mol of allyl glycidyl ether. (i.e., Figure 1 For the middle molecule, the reaction is performed based on a accounting for 60%, b accounting for 8%, and c accounting for 32%)

[0075] Multi-arm star polymer 6

[0076] Compared with the preparation method of the multi-arm star polymer 3, the difference is that in step S2, 0.095 mol of allyl trimethyl ammonium chloride is replaced by 0.133 mol of allyl trimethyl ammonium chloride, and 0.095 mol of allyl glycidyl ether is replaced by 0.533 mol of allyl glycidyl ether. (i.e., Figure 1 For the middle molecule, the reaction is performed based on a accounting for 60%, b accounting for 32%, and c accounting for 8%)

[0077] linear polymers

[0078] Compared with the preparation method of multi-arm star polymer 3, the difference is that 0.002 mol of the initiator molecule is replaced by methyl 2-bromoisobutyrate.

[0079] Unless otherwise specified, the components and raw materials used in the preparation examples, embodiments and comparative examples of the present invention are all commercially available raw materials, and the components and raw materials used in each parallel experiment are all of the same kind.

[0080] The following are the test methods for the performance parameters involved in the present invention:

[0081] (1) Absolute molecular weight M w : Determined by static light scattering technology of GPC-MALLS system;

[0082] (2) Polymer dispersibility index (PDI): measured by GPC instrument coupled with differential detector;

[0083] (3) Surface tension: Measured according to GB / T 8077-2023 “Test method for homogeneity of concrete admixtures”;

[0084] (4) Air content: Measured according to GB / T50080-2016 "Standard for Test Methods of Performance of Ordinary Concrete Mixtures";

[0085] (5) Anti-permeability performance: The anti-permeability performance of concrete specimens was tested using the water seepage height method in accordance with GB / T 50082-2009 “Standard for test methods for long-term performance and durability of ordinary concrete”;

[0086] (6) Compressive strength: The specimen size is 150 mm × 150 mm × 150 mm, and the test is carried out in accordance with the relevant provisions of standard GB / T 50081-2019.

[0087] (7) Workability: According to GB / T50080-2016 "Standard for Test Methods of Performance of Ordinary Concrete Mixtures", the slump test, Vebe consistency test, and cohesiveness and water retention test are conducted.

[0088] Preparation of defoamers 1-7

[0089] 1) Mix the multi-arm star polymers 1 to 6 and the linear polymer with the co-emulsifier in sequence, heat to 80°C, and stir at 400 rpm for 15 min;

[0090] 2) Deionized water was heated to 80°C, and the oil phase obtained in step 1) was slowly added to the aqueous phase. The mixture was stirred at 2000 rpm for 35 minutes while controlling the pH to 6.5. The mixture was cooled to room temperature to obtain a defoaming agent.

[0091] Table 1 Characterization of polymers and surface tension of the corresponding defoamers prepared

[0092]

[0093] From the data of multi-arm star polymers 3 to 6 in Table 1, it can be seen that the higher the ratio of quaternary ammonium salt and epoxy group, the greater the surface tension of the corresponding defoamer; from the data of multi-arm star polymer 3 and linear polymer, it can be seen that the surface tension of the defoamer corresponding to the multi-arm star polymer is smaller.

[0094] Steel skeleton:

[0095] Six prestressed longitudinal force-bearing steel wires and eight longitudinal force-bearing steel bars are used as main reinforcements; cold-drawn low-carbon steel wires are used as erection rings with a spacing of 600 mm; spiral reinforcements are used as annular structures with a spacing of 50 mm within 1.5 m from both ends of the pole and a spacing of 100 mm in the remaining sections.

[0096] A method for preparing a high-strength waterproof concrete pole comprises the following steps:

[0097] Cement, silica fume, and sand were mixed according to the mix ratio and stirred for 3 minutes. Water was added and stirred for 3 minutes. After adding the water reducer, stirring was continued for 8 minutes. Steel fiber and defoaming agent were slowly added and stirring was continued for 8 minutes. The material was discharged. According to the relevant provisions of "Ring Concrete Poles" GB4623-2014, the same steel skeleton was used. The C120 high-performance green concrete pole was designed with a cracking test bending moment of 97.5 kN·m. The pole had a wall thickness of 50 mm and a tapered pole shape with a taper of 1 / 75. The diameter was 190 mm, the root diameter was 350 mm, and the pole length was 12 m. The pole was produced by centrifugal molding process and cured by atmospheric pressure steam curing for 27 days. The pole was demoulded after curing and a silicon-based reactive waterproof coating was sprayed on the pole surface.

[0098] Table 2 Examples 1 to 11, high strength waterproof concrete formula (kg / m 3 )

[0099]

[0100] Table 3 Comparative Examples 1 to 6, high strength waterproof concrete formula (kg / m 3 )

[0101]

[0102] Table 4 Performance test of high strength waterproof concrete

[0103]

[0104] As shown in Table 4, Examples 1 to 8 and Comparative Examples 1 to 6, adding the defoamer prepared by the present invention in an appropriate amount can make concrete have better compressive strength, lower air content and better anti-seepage performance. As shown in Examples 4, 6, 7 and 8, within a certain range, as the amount of defoamer increases, the performance of the concrete is better; as shown in Comparative Example 1, without adding the defoamer of the present invention, the strength and anti-seepage performance are relatively poor; as shown in Comparative Example 2, adding too much defoamer of the present invention will cause the performance to decline and the workability to deteriorate; as shown in Comparative Example 3, although the surface tension of defoamer 4 is low, the air content of the concrete is high, which is due to the poor dispersibility of the defoamer in the concrete; as shown in Comparative Example 4, too much quaternary ammonium salt structure has a negative effect on the defoaming performance of defoamer 5 in concrete. The force also has an impact. On the one hand, the Si-H structure is reduced, and on the other hand, there are too many hydrophilic groups, which reduce the rate at which the defoamer migrates to the air bubble and water interface. From the data of Comparative Example 5, it can be seen that too many epoxy groups in defoamer 6 will also lead to a decrease in concrete performance. This is because the excessive epoxy groups increase the probability of the early epoxy groups reacting with the concrete molecules, making it unable to exert its defoaming ability. However, the increase in epoxy groups slightly improves its anti-permeability performance. From the data of Comparative Example 6, it can be seen that the concrete performance is poor when defoamer 7 with a linear structure is added, indicating that the defoaming ability, dispersibility and workability of the linear structure are all poor.

[0105] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-strength waterproof concrete pole, characterized in that: It includes high-strength waterproof concrete, steel skeleton and waterproof coating applied on the surface of the pole. The high-strength waterproof concrete includes 750~850kg / m3 of cement in terms of mix ratio. 3 Silica fume 130~170 kg / m 3 , sand 1000~1300 kg / m 3 , Steel fiber 150~250 kg / m 3 , water reducing agent 10~15kg / m 3 , water 170~190 kg / m 3 and defoaming agent 0.5~1.5 kg / m 3 The defoamer comprises, by weight, 40 to 50 parts of a multi-arm star polymer, 1 to 2 parts of an emulsifier and 40 to 50 parts of water; the multi-arm star polymer is composed of one initiator molecule and 3 to 8 linear polymer chains; the initiator molecule is one or more of a polyamino compound modified with a halogenated acyl halide compound and a polyhydroxy compound modified with a halogenated acyl halide compound; The linear polymer chain has the following molecular structure: , wherein R is the initiator molecule connected to the linear polymer chain; wherein R1, R2 and R3 are independently represented by one of methyl and hydrogen, and wherein a:b:c=(80~90):(5~10):(5~10).

2. A high-strength waterproof concrete pole according to claim 1, characterized in that: The auxiliary emulsifier is selected from at least one of polyoxyethylene ether and polysorbate.

3. The high-strength waterproof concrete pole according to claim 1, characterized in that: The initiating molecule is one or more of glycerol, trimethylolpropane, 1,3,5-triazine-2,4,6-triamine, 1,3,5,7-tetrahydroxyadamantane, dipentaerythritol and hexamethylol melamine modified with a halogenated acyl halide compound.

4. A high-strength waterproof concrete pole as claimed in claim 1, characterized in that: The preparation method of the multi-arm star polymer is as follows: S1. In a dry reactor, add an initiator molecule, cuprous bromide, and hydrogenated acrylate siloxane monomers. After adding solvent, freeze-thaw and degas the mixture three times. Then, under a nitrogen or argon purge, add the ligand N, N, N', N', N''-pentamethyldiethylenetriamine dispersed in anisole. The reaction is carried out at 50-60°C for 2-3 hours. After the reaction is completed, oxygen is introduced in an ice-water bath to terminate the reaction. The mixture is passed through a silica gel column to remove the catalyst. The filtrate is precipitated in a methanol-water mixture to obtain a multi-arm star polymer precursor. S2. Take a dry reactor, add the multi-arm star polymer precursor, allyl trimethylammonium chloride, and allyl glycidyl ether and dissolve them in dry toluene solvent. Degas the mixture by freeze-thawing three times. Then, add the Custer catalyst under nitrogen or argon purge. Stir and react at 55-65°C for 2-3 hours. Pass the mixture through a silica gel column to remove the catalyst and solvent to obtain a multi-arm star polymer.

5. A high-strength waterproof concrete pole as claimed in claim 4, characterized in that: The molar ratio of the initiator molecule in step S1: hydrogenated acrylate siloxane monomer: cuprous bromide: ligand N, N, N', N', N''-pentamethyldiethylenetriamine is 1: (400-600): (4-10): (8-20). The amount of the Custer catalyst added in step S2 is 0.1-0.3% of the total amount of allyltrimethylammonium chloride and allyl glycidyl ether.

6. A high-strength waterproof concrete pole as claimed in claim 1, characterized in that: The preparation method of the defoamer is as follows: 1) After mixing the multi-arm star polymer and the co-emulsifier, heat to 60-80°C and stir at 300-400 rpm for 10-15 minutes to obtain an oil phase; 2) Deionized water is heated to 60-80°C, and the oil phase obtained in step 1) is slowly added to the water. The mixture is stirred at 1500-2000 rpm for 25-35 minutes while controlling the pH to 6.0-7.

5. The mixture is cooled to room temperature to obtain a defoaming agent.

7. The method for preparing a high-strength waterproof concrete pole according to any one of claims 1 to 6, characterized in that: The following steps are involved: Mix cement, silica fume and sand according to the mix ratio, stir for 1 to 5 minutes, add water, stir for 2 to 5 minutes, add water reducer, continue stirring for 2 to 10 minutes, then slowly add steel fiber and defoaming agent, continue stirring for 2 to 10 minutes, discharge the material, put the steel skeleton into the mold and cast it, produce it by centrifugal molding process, and cure it by steam curing at normal pressure. After curing, the pole is demoulded and a silicon-based reactive waterproof coating is sprayed on the surface of the pole.

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