Low-carbon composite cement electric pole and preparation process thereof

Abstract

The application discloses a low-carbon composite cement electric pole and a preparation process thereof and belongs to the technical field of low-carbon cement products. The low-carbon composite cement electric pole is prepared by the following steps: mixing uniformly slag powder, fly ash, chopped basalt fiber, modified carbide slag, aggregate, alkali activator, water reducing agent, retarder and mixing water to obtain low-carbon composite cement concrete, distributing the low-carbon composite cement concrete in a steel mold containing a skeleton, closing the mold, centrifugally forming, steam curing, naturally curing after demolding, and thus obtaining the low-carbon composite cement electric pole; the modified carbide slag is prepared by in-situ modification of the carbide slag by molten stearic acid, formation of calcium stearate on the surface of the carbide slag, and then grafting of cage-shaped polysilsesquioxane and oligomeric silanol and spraying coating by molten Brazil palm wax; the low-carbon composite cement electric pole replaces traditional portland cement, realizes efficient utilization of solid waste, and has excellent mechanical properties and durability.

Description

Technical Field

[0001] This invention belongs to the field of low-carbon cement products technology, specifically relating to a low-carbon composite cement utility pole and its preparation process. Background Technology

[0002] With the advancement of global dual-carbon goals, alternative technologies for traditional high-carbon-emission building materials have become a focus of industry research and development. Cement utility poles, as core components of power and communication infrastructure, are consumed in enormous quantities annually. Traditional products mainly rely on silicate cement as a binder, but the production process of silicate cement has high carbon emission intensity, contradicting the concept of low-carbon development. Furthermore, traditional cement utility poles generally use steel bars as reinforcement, which are susceptible to corrosion from moisture and chloride ions during outdoor service, leading to pole cracking, reduced strength, shortened service life, and high maintenance and replacement costs.

[0003] To address the aforementioned issues, the industry is gradually exploring two major technological pathways: one is to replace traditional silicate cement with low-carbon cementitious materials, and the other is to replace steel bars with non-metallic reinforcing bars. Among these, geopolymers (also known as geopolymers), as a novel low-carbon cementitious material, use granulated blast furnace slag, fly ash, and other industrial solid wastes as precursors. Through an alkali-activated reaction, they form NASH gel as the cementing phase. Their carbon emissions are only 1 / 5 to 1 / 10 of traditional silicate cement, and they achieve resource utilization of solid waste, making them considered the most promising alternative material. Meanwhile, basalt fiber composite resin bars (BFRP bars) have become an ideal replacement for steel bars due to their high strength, corrosion resistance, and light weight. However, the combined application of geopolymers and BFRP bars faces two major technological bottlenecks: I. Interface bonding defects: Geopolymers have a fast curing rate and high volume shrinkage rate, which easily leads to micropores and microcracks inside; moreover, the surface of BFRP reinforcement is an organic resin matrix, which has poor interfacial compatibility with the inorganic geopolymer matrix. It relies solely on physical adsorption to bond, resulting in weak interfacial adhesion. Under stress, the reinforcement is prone to separation and slippage from the matrix, which seriously affects the bending and crack control performance of the utility pole and limits its engineering application.

[0004] II. Shortcomings of Geopolymers: Compared with traditional silicate cement, geopolymers are sensitive to curing temperature, and high-temperature curing will further aggravate shrinkage cracking; in addition, their alkali-activated system has extremely high requirements for the alkali resistance of the interface modifier, and conventional organic modifiers are prone to hydrolysis failure.

[0005] To improve interfacial adhesion, existing technologies attempt to introduce nanomaterials (such as nano-SiO2) for modification. However, unmodified nano-SiO2 has strong polar hydroxyl groups on its surface, easily agglomerating into large particles that cannot effectively fill nanopores. Furthermore, it has no chemical interaction with organic resins or inorganic matrices, only providing limited physical reinforcement. Some solutions use silane coupling agents to modify nanomaterials, but these are mostly for single systems (e.g., only suitable for cement matrices or single reinforcing bars), failing to consider the synergistic compatibility of geopolymers in strongly alkaline environments, the organic phase of BFRP bars, and multi-component systems of solid waste precursors, resulting in limited modification effects. On the other hand, the resource utilization of industrial solid waste, calcium carbide slag, is also a key focus of the industry. As a byproduct of acetylene production via the calcium carbide process, calcium carbide slag has a huge annual emission volume. Its main component, calcium hydroxide, possesses potential alkali-activated activity. If it can be effectively integrated into geopolymer systems, carbon emissions can be further reduced and resource utilization improved. However, existing technologies for treating calcium carbide slag have significant drawbacks. For example, the calcium carbide slag-fly ash co-carbonization and mineralization technology disclosed in patent document CN121405421B generates aragonite-type CaCO3 micro / nano structures through carbonization reactions. While this achieves surface hydrophobicity, it suffers from the following defects: the carbonization reaction consumes calcium hydroxide, completely losing its alkali-activated activity and only serving as a physical filler; the perfluorodecyltriethoxysilane used is prone to seepage and contamination of soil and groundwater during long-term outdoor exposure; only surface hydrophobicity is achieved, while the internal structure remains hydrophilic, leading to water absorption and corrosion of the reinforcing steel at cracked inner walls after centrifugal molding; the calcium carbonate micro / nano structure has poor mechanical stability and is prone to detachment during centrifugal molding, resulting in insufficient hydrophobic durability; the CF bonds of fluorosilanes are easily hydrolyzed and ineffective in the strongly alkaline environment of geopolymers, making long-term service unsuitable. Therefore, this type of solution is completely unsuitable for the application scenarios of geopolymer-based utility poles. In addition, there is room for optimization in the existing manufacturing process of geopolymer utility poles: the centrifugal molding and curing process of traditional cement utility poles is not adapted to the high viscosity and temperature sensitivity of geopolymers, resulting in uneven density and many internal defects after molding; at the same time, there is a lack of self-healing design for the large shrinkage and easy cracking of geopolymers, and the expansion of cracks during long-term service can easily affect the structural safety.

[0006] In summary, existing technologies reveal several drawbacks: traditional silicate cement poles have high carbon emissions and their reinforcing bars are prone to corrosion. While geopolymer-based poles offer low-carbon advantages, they suffer from drawbacks such as weak interfacial bonding with BFRP reinforcement, ineffective utilization of solid waste like carbide slag, poor adaptability to molding processes, and a lack of long-term self-healing capabilities. Therefore, developing a low-carbon composite cement pole that can completely replace traditional silicate cement, achieve efficient utilization of solid waste, and possess excellent mechanical properties and durability has become a pressing technical challenge for the industry. Summary of the Invention

[0007] The purpose of this invention is to provide a low-carbon composite cement pole and its preparation process, which can completely replace traditional silicate cement, achieve efficient utilization of solid waste, and possess excellent mechanical properties and durability.

[0008] The objective of this invention can be achieved through the following technical solutions: A process for preparing a low-carbon composite cement pole includes the following steps: mixing slag powder, fly ash, chopped basalt fiber, modified carbide slag, aggregate, alkali activator, water-reducing agent, retarder and mixing water evenly to obtain low-carbon composite cement concrete; placing the concrete into a steel mold containing a skeleton; closing the mold; centrifugal molding; steam curing; demolding; and natural curing to obtain the low-carbon composite cement pole. The modified calcium carbide slag is prepared by in-situ modification of calcium carbide slag with molten stearic acid, generating calcium stearate on its surface, grafting cage-like polysilsesquioxane and oligomeric silanol, and then spraying with molten carnauba wax.

[0009] Using slag powder and fly ash as solid waste-based low-carbon cementitious precursors to replace traditional high-carbon silicate cement; supplemented with randomly distributed short-cut basalt fibers to play a role in crack resistance, toughening, and energy dissipation; introducing three-layer core-shell modified carbide slag as a functional admixture, which, together with an alkali activator, stimulates the hydration polymerization of cementitious materials to generate a dense NASH gel matrix; then, through centrifugal molding to extrude slurry air bubbles and improve the density of the pole body, and with the help of curing system, perfect the hydration gel structure, and finally obtain a low-carbon composite cement pole with good performance.

[0010] Using carbide slag powder as the core matrix, which is rich in active calcium hydroxide, as the raw material basis for potential alkali-activated activity and microcrack self-healing reaction; the inner layer generates a calcium stearate bonded layer in situ on the surface of carbide slag, which on the one hand forms a chemical bond with the hydroxyl groups on the surface of carbide slag, providing a firm anchoring point for the middle layer; on the other hand, it shields some highly active sites, realizes delayed release of active components, and avoids the problems of rapid hydration and rapid solidification runaway in the geopolymer alkali-activated system; The intermediate layer is a composite bridging layer constructed by a cage-like polysilsesquioxane (POSS) and oligomeric silanol. One end is chemically bonded to the calcium stearate layer, while the other end is grafted and coupled to the outer palm wax organic phase. At the same time, it releases a latent silicon source to participate in the hydration reaction of the geopolymer, optimizes the microporous structure and interfacial bonding of the matrix, and realizes the chemical grafting between inorganic and organic phases. The outer layer is coated with a carnauba wax layer, which forms a continuous hydrophobic physical barrier on the particle surface. This not only endows the modified carbide slag with its own superhydrophobic properties, but also constructs a through-type hydrophobic network in the concrete matrix, blocking the capillary permeation channels of water and chloride ions. At the same time, it further regulates the slow dissolution of active calcium ions, realizes gradient hydration, and inhibits drying shrinkage and microcrack initiation.

[0011] As a preferred embodiment of the present invention, the method for preparing the modified carbide slag specifically includes the following steps: S1. Molten stearic acid is sprayed onto the surface of carbide slag in a nitrogen atmosphere to obtain material A. The use of an inert nitrogen atmosphere prevents the core active components in the carbide slag from carbonizing upon contact with air, completely solving the problem of carbide slag losing its alkali-activating ability due to existing carbonization and mineralization processes. This allows carbide slag to be used as an endogenous alkali activator in geopolymer systems. Stearic acid reacts in situ with the surface of carbide slag to form a chemically bonded calcium stearate monolayer, not a simple physical coating. This layer can prevent premature dissolution of internal alkali components, delaying the problems of rapid hydration and severe shrinkage of geopolymers, improving the workability of concrete construction, and reducing primary microcracks in the matrix. The calcium stearate layer alters the surface polarity of the carbide slag, providing an excellent interface foundation for subsequent POSS and oligomeric silicone alcohols to be grafted and anchored on the surface, enhancing the bonding strength of the intermediate functional layers.

[0012] S2. Disperse material A in anhydrous ethanol, add trisilyl isooctyl-POSS and oligosiloxane solution, heat and stir at 60-70℃, reflux for 3-4 hours, filter under reduced pressure and dry to obtain material B. POSS and oligosiloxane are rich in active silanols, which can undergo dehydration condensation with calcium stearate layer and carbide slag surface groups to form stable Si-O-Ca and Si-O-Si covalent bonds. The composite bridging layer has strong bonding force and can withstand strong shearing action such as high-speed centrifugation and stirring, avoiding the shedding and functional failure of traditional calcium carbonate micro-nano layers. The POSS and oligosiloxane composite system is structurally stable in the strongly alkaline environment of geopolymers and will not undergo CF bond hydrolysis failure like fluorosilane modifiers, ensuring the long-term existence of modification effect. Under strong alkaline conditions, the trisilyl isooctyl-POSS cage-like skeleton can be directionally opened to release active silicon units, which, together with oligosiloxane, participate in the geopolymerization reaction, promote NASH gel formation, improve the density and mechanical strength of the gel matrix, and further inhibit shrinkage cracking.

[0013] S3. Molten carnauba wax is sprayed onto the surface of material B to obtain modified carbide slag. During the room temperature mixing stage, the complete wax layer forms a physical barrier, allowing the modified carbide slag to be inertly dispersed in the concrete, preventing premature alkali activation. The high shear force and hydration exothermic reaction during centrifugal molding cause the wax layer to fracture in a directional manner, allowing the internal alkali components and silicon source to function normally, balancing construction stability and performance. The wax layer is an integral coating structure, breaking through the limitations of traditional technology where only the surface is hydrophobic, significantly reducing the overall water absorption rate of the hardened body, effectively preventing moisture from penetrating into the matrix, avoiding moisture-induced deterioration of the BFRP reinforcement interface, and protecting the long-term stability of the reinforcement. When microcracks develop in the utility pole after long-term service, external moisture penetration will damage the residual wax layer, triggering the slow release of internal calcium hydroxide and carbonization to form calcium carbonate, which combines with the silicon source to form a gel to seal the cracks, achieving self-healing and extending the service life of the component.

[0014] As a preferred technical solution of the present invention, step S3 further includes the following steps: dispersing the material A in anhydrous ethanol, adding trisilyl isooctyl-POSS and oligomeric silanol solution, heating and stirring at 60-70°C, refluxing for 3-4 hours, filtering under reduced pressure, drying, adding KH-101 modified nano-calcium carbonate and KH-570 modified nano-silica and mixing evenly to obtain material B. Based on the grafting modification of trisilyl isooctyl-POSS and oligosiloxane, KH-101 modified nano-calcium carbonate and KH-570 modified nano-silica are compounded to synergistically construct a composite intermediate functional layer. On the one hand, the multi-crosslinked network enhances the structural strength, withstands strong centrifugal shearing, and is not easily detached. On the other hand, the two nanofillers achieve full-scale pore filling from nano to micron, improving the density and impermeability of the matrix. At the same time, a dual-mechanism self-healing system of calcium carbonate crystallization-geopolymer gel is formed, which greatly improves the crack repair efficiency and repair strength. In addition, the compound system can constrain the shrinkage of geopolymer, slow down the alkali-induced reaction rate, optimize the construction performance and the mechanical and durability properties of the rod. The overall structure is resistant to strong alkalis and aging, is green and environmentally friendly, and is easy to industrialize.

[0015] Modified calcium carbide slag, with calcium carbide slag as the core, calcium stearate as the inner bonding layer, POSS / oligosilicone as the intermediate bridging layer, and carnauba wax as the outer hydrophobic barrier, can effectively seal the active calcium hydroxide component in the calcium carbide slag for a long time. It has the basic functions of delayed release of activity, overall hydrophobicity and seepage prevention, regulation of hydration coagulation, and inhibition of drying shrinkage. KH-101 modified nano-calcium carbonate, with surface organic modification by titanate coupling agent, has excellent particle dispersibility and is not easy to agglomerate. On the one hand, it can act as a seed crystal for hydration crystallization, inducing the uniform precipitation of polymer hydration products in slag-fly ash base. On the one hand, it optimizes the micropore size distribution of the matrix; on the other hand, it can act as a seed crystal for self-healing microcracks, preferentially inducing calcium ions to carbonize at the cracks to form calcium carbonate precipitates, thus accelerating the sealing and repair of microcracks; KH-570 modified nano silica is grafted with silane coupling agent and its surface is rich in active silanol groups, which can not only condense and bond with the silanol groups in the intermediate layer of modified carbide slag, thus strengthening the interfacial compatibility of particles and the overall structural density, but also continuously consume free calcium hydroxide in the system to generate hydrated calcium silicate gel, which fills the nanopores inside the matrix and achieves continuous strength growth.

[0016] After the three components are synergistically compounded, the particle dispersion is optimized, agglomeration defects are eliminated, the matrix density is significantly improved, porosity and drying shrinkage are reduced, mechanical strength is enhanced, and both early strength and long-term strength are improved. The self-healing performance of microcracks is greatly improved, and the service life is extended. The ternary compound system optimizes the interface transition zone between the cementitious matrix and the aggregate, basalt fiber and reinforcement skeleton, and improves the interfacial bonding strength. After centrifugation molding, the rod body is dense and uniform inside, without delamination, voids and pore defects, and the overall structural integrity and long-term service stability are greatly improved.

[0017] As a preferred embodiment of the present invention, in step S1, the particle size of the carbide slag is 10-20 μm; the mass ratio of the carbide slag to stearic acid is 100:1.5-2.0.

[0018] As a preferred embodiment of the present invention, in step S2, the mass ratio of material A, anhydrous ethanol, trisilyl isooctyl-POSS, and oligomeric silanol solution is 1-2:30-40:0.005-0.01:0.05-0.1; the preparation method of the oligomeric silanol is as follows: tetraethyl orthosilicate is added to a mixed solvent of anhydrous ethanol / deionized water, the pH of the system is adjusted to acidic, and the mixture is heated and stirred to obtain the oligomeric silanol solution.

[0019] As a preferred embodiment of the present invention, adjusting the pH of the system to acidity is preferably adjusting the pH of the system to 4-5.

[0020] As a preferred embodiment of the present invention, in step S3, the mass ratio of material B to carnauba wax is 100:2.5-3.5.

[0021] Another objective of this invention is to provide a low-carbon composite cement utility pole, wherein the mass ratio of slag powder, fly ash, chopped basalt fiber, modified carbide slag, aggregate, alkali activator, water-reducing agent, retarder, and mixing water is 50-70:30-50:1.5-2.5:10-20:300-370:15-25:0.5-1.0:0.2-0.6:15-25.

[0022] This invention limits the mass ratio of each raw material component in low-carbon composite cement poles, resulting in a balanced material mix, reasonable gradation, and strong reaction compatibility. It fully utilizes the low-carbon cementitious activity of slag powder and fly ash, while short-cut basalt fibers provide crack resistance and toughening. Simultaneously, modified carbide slag provides stable hydrophobic and seepage-proof, active slow-release, and self-healing effects. The addition of appropriate amounts of alkali activators, water-reducing agents, and retarders synergistically regulates the hydration rate, workability, and setting and hardening properties. The aggregate skeleton is densely embedded, resulting in good overall slurry encapsulation, no segregation, and no bleeding, making it suitable for centrifugal molding processes for utility poles.

[0023] As a preferred embodiment of the present invention, the aggregate is composed of manufactured sand with a fineness modulus of 2.6-3.0 and crushed stone with a particle size of 5-15mm in a mass ratio of 12-15:18-22.

[0024] This invention specifies that the aggregate is composed of manufactured sand with a fineness modulus of 2.6-3.0 and crushed stone with a particle size of 5-15mm. The gradation is continuous and reasonable, which can effectively fill the gaps between particles, reduce the internal porosity of concrete, and improve the density and overall structural integrity of the mixture. At the same time, it optimizes the interlocking effect of the aggregate skeleton, enhances the matrix's resistance to deformation and cracking, reduces drying shrinkage, and avoids internal looseness, delamination, and drying shrinkage cracks after the utility pole is formed. The structural service stability and durability are greatly improved.

[0025] As a preferred embodiment of the present invention, the alkaline activator is composed of water glass, sodium hydroxide and water in a mass ratio of 42-46:10-12:18-22.

[0026] As a preferred embodiment of the present invention, the slag powder is S95 grade granulated blast furnace slag powder; the fly ash is Class II F fly ash; the water-reducing agent is a polycarboxylate water-reducing agent; and the retarder is selected from at least one of sodium gluconate, sodium tartrate, and borax.

[0027] This invention optimizes and limits the types of raw materials: the slag powder is selected from S95 grade granulated blast furnace slag powder, which has high alkali-activated reactivity and can generate dense cementitious products, improving the strength and density of the matrix; the fly ash is selected from Class II F fly ash, which has both pozzolanic activity and micro-aggregate filling effect, which can optimize the slurry gradation, reduce hydration temperature rise, reduce drying shrinkage, and form synergistic cementitious properties with the slag powder; the water-reducing agent is a polycarboxylate water-reducing agent, which has good water-reducing and dispersing effects, strong adaptability to strong alkali systems, can improve the workability of concrete, meet the centrifugal molding process of utility poles, and effectively reduce porosity defects; the retarder is selected from at least one of sodium gluconate, sodium tartrate, and borax, which has excellent compatibility with this formula system, can stably control the setting time, ensure the construction operation window, and does not weaken the later strength and durability. The synergistic combination and complementary properties of the raw materials result in a low-carbon composite cement utility pole with a dense structure, strong interfacial bonding, and excellent bending and crack resistance.

[0028] The beneficial effects of this invention are: (1) The low-carbon composite cement pole and its preparation process disclosed in this invention use slag powder, fly ash and carbide slag industrial solid waste as core cementing and functional components. It relies on alkali-activated reaction to form a geopolymer gel to replace high-carbon cement, which greatly reduces carbon emissions from building material production and realizes the resource substitution of bulk solid waste. It completely solves the defects of traditional pole preparation that rely on silicate cement and have high carbon emission intensity from the source of raw materials. The modified carbide slag is sealed with active calcium hydroxide in a three-layer structure. After microcracks are generated in the concrete, carbon dioxide and moisture in the air enter the cracks and react with the slow-released calcium hydroxide inside to generate calcium carbonate precipitate to automatically fill and seal the microcracks. At the same time, the system has a dense microstructure and a strong interface bond, and has a stable microcrack self-healing ability, which overcomes the shortcomings of existing poles that can only be passively repaired after cracking and cannot be repaired independently.

[0029] (2) The low-carbon composite cement pole and its preparation process disclosed in this invention form a nanoscale chemical bonding layer on the surface of carbide slag through in-situ fatty acid calcification reaction, providing chemical active sites for the subsequent silanol anchoring of POSS; through the synergistic effect of trisilol isooctyl-POSS and oligosilanol, the silanol group and the matrix surface form a stable intermediate bridging layer through condensation anchoring and physical cross-linking synergistic effect, which significantly improves the bonding strength of the outer wax seal compared with single stearic acid modification. The molten palm wax spray coating process replaces the perfluorosilane hydrophobic agent commonly used in the prior art, eliminating the environmental risk of fluorinated chemicals seeping into the soil and groundwater during the service life of the pole.

[0030] (3) The low-carbon composite cement pole and its preparation process disclosed in this invention introduce KH-101 modified nano-calcium carbonate and KH-570 modified nano-silica to form an enhanced modified carbide slag. The nano-calcium carbonate, as a homogeneous seed crystal of the self-healing product, can significantly reduce the energy barrier for calcium carbonate deposition and nucleation at the cracks, thereby improving the self-healing rate of microcracks. The nano-silica continuously consumes calcium hydroxide in the system through the volcanic ash effect, thereby continuously increasing the compressive strength of the pole. The two nanofillers are pretreated by titanate coupling agent KH-101 and silane coupling agent KH-570, respectively, to avoid the agglomeration problem of nanoparticles in the modified carbide slag system.

[0031] (4) The low-carbon composite cement pole and its preparation process disclosed in this invention improve the comprehensive utilization rate of solid waste and reduce carbon emissions by optimizing the formula composition and using a synergistic system of slag powder, fly ash and modified carbide slag ternary precursors; the short-cut basalt fibers dispersed in the cementitious system form a three-dimensional random fiber network, which can effectively inhibit the initiation and expansion of microcracks in the centrifugal molding stage and the early shrinkage stage; the synergistic optimization among aggregates, alkali activators, water-reducing agents and retarders improves the comprehensive performance of the obtained pole products. Detailed Implementation

[0032] The claims of the present invention will be further described in detail below with reference to specific embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of protection of the claims of the present invention are still within the scope of protection of the claims of the present invention.

[0033] The following is an explanation of some of the raw materials used in this invention: Short-cut basalt fiber, Jiangsu Kangdafu New Material Technology Co., Ltd.; Polycarboxylate superplasticizer, Foshan Chaosu Technology Co., Ltd.; Trisilyl isooctyl-POSS, Forsman Technology (Beijing) Co., Ltd.

[0034] Example 1 100 parts by mass of dried carbide slag with a particle size of 10 μm were placed in a high-speed mixer and preheated to 90°C. 1.5 parts by mass of molten stearic acid were sprayed in under a nitrogen atmosphere and stirred for 20 min to obtain material A. 1 part by volume of tetraethyl orthosilicate was added to a mixed solvent consisting of 4 parts by volume of anhydrous ethanol and 1 part by volume of deionized water. 0.1 mol / L hydrochloric acid was added to adjust the pH of the system to 4, and the mixture was stirred at 60°C for 1.5 h to obtain an oligomeric silanol solution. 1 part by mass of material A was dispersed in 30 parts by mass of anhydrous ethanol. 0.005 parts by mass of trisilyl isooctyl-POSS and 0.05 parts by mass of the oligomeric silanol solution were added. The mixture was heated, stirred, refluxed, and cooled at 60°C for 3 h. It was then filtered under reduced pressure and vacuum dried at 80°C for 6 h to obtain material B. 2.5 parts by mass of carnauba wax were melted to 90°C and sprayed onto 100 parts by mass of material B. After cooling, the mixture was passed through an 80-mesh sieve to obtain modified carbide slag.

[0035] Add 50 parts by weight of S95 grade granulated blast furnace slag powder, 30 parts by weight of Grade II F fly ash, 1.5 parts by weight of chopped basalt fiber, and 10 parts by weight of modified carbide slag to a mixer and dry mix for 2 minutes. Add 300 parts by weight of aggregate composed of manufactured sand with a fineness modulus of 2.6 and crushed stone with a particle size of 5mm in a mass ratio of 12:18 and continue to dry mix for 2 minutes. Mix 15 parts by weight of alkali activator with a solution modulus of 1 composed of water glass, sodium hydroxide, and water in a mass ratio of 42:10:22, 0.5 parts by weight of polycarboxylate superplasticizer, 0.2 parts by weight of sodium tartrate, and 15 parts by weight of mixing water evenly and pour into the mixer. In the machine, wet mixing for 3 minutes yields low-carbon composite cement concrete. BFRP bars and non-metallic binding wires are braided into a pole frame with a reinforcement ratio of 1.0%, and placed into a centrifugal steel mold. The low-carbon composite cement concrete is then placed into the mold, and the mold is closed. The pole is centrifuged at 60 r / min for 3 minutes, then at 150 r / min for 3 minutes, and then at 350 r / min for 8 minutes for further centrifugation. The mold is then left to stand for 1 hour, and the temperature is raised to 65℃ at a rate of 10℃ / h. It is then cured at this constant temperature for 4 hours, followed by natural cooling to room temperature. After demolding, it is naturally cured at room temperature for 14 days to obtain the low-carbon composite cement pole.

[0036] Example 2 100 parts by weight of dried carbide slag with a particle size of 15 μm were placed in a high-speed mixer and preheated to 90°C. 1.8 parts by weight of molten stearic acid were sprayed in under a nitrogen atmosphere and stirred for 25 min to obtain material A. 1 part by volume of tetraethyl orthosilicate was added to a mixed solvent consisting of 4 parts by volume of anhydrous ethanol and 1 part by volume of deionized water. 0.1 mol / L hydrochloric acid was added to adjust the pH of the system to 4.5, and the mixture was stirred at 60°C for 2.0 h to obtain an oligomeric silanol solution. 1.5 parts by weight of material A were dispersed in 35 parts by weight of anhydrous ethanol. 0.008 parts by weight of trisilyl isooctyl-POSS and 0.08 parts by weight of the oligomeric silanol solution were added. The mixture was heated, stirred, refluxed, and cooled at 65°C for 3.5 h. The mixture was then filtered under reduced pressure and dried under vacuum at 80°C for 7 h to obtain material B. 3.0 parts by weight of carnauba wax was melted to 92°C and sprayed onto 100 parts by weight of material B. After cooling, the mixture was passed through a 100-mesh sieve to obtain modified carbide slag.

[0037] Add 65 parts by weight of S95 grade granulated blast furnace slag powder, 40 parts by weight of Class II F fly ash, 2.0 parts by weight of chopped basalt fiber, and 15 parts by weight of modified carbide slag to a mixer and dry mix for 2.5 minutes. Add 335 parts by weight of aggregate composed of manufactured sand with a fineness modulus of 2.8 and crushed stone with a particle size of 10 mm in a mass ratio of 13:20 and continue dry mixing for 2.5 minutes. Mix 20 parts by weight of alkali activator with a solution modulus of 1 composed of water glass, sodium hydroxide, and water in a mass ratio of 44:11:20, 0.8 parts by weight of polycarboxylate superplasticizer, 0.4 parts by weight of sodium tartrate, and 20 parts by weight of mixing water evenly and pour into the mixer. In the mixer, wet mixing for 4 minutes yields low-carbon composite cement concrete. BFRP reinforcement and non-metallic binding wire are braided into a pole frame with a reinforcement ratio of 1.2%, and placed into a centrifugal steel mold. The low-carbon composite cement concrete is then placed into the mold, and the mold is closed. The pole is centrifuged at 70 r / min for 4 minutes, then at 180 r / min for 4 minutes, and then at 380 r / min for 10 minutes for further centrifugation. The mold is then left to stand for 1.2 hours, and the temperature is raised to 68℃ at a rate of 15℃ / h. It is then cured at this constant temperature for 5 hours, followed by natural cooling to room temperature. After demolding, it is naturally cured at room temperature for 14 days to obtain the low-carbon composite cement pole.

[0038] Example 3 100 parts by mass of dried carbide slag with a particle size of 20 μm were placed in a high-speed mixer and preheated to 90°C. 2.0 parts by mass of molten stearic acid were sprayed in under a nitrogen atmosphere and stirred for 30 min to obtain material A. 1 part by volume of tetraethyl orthosilicate was added to a mixed solvent consisting of 4 parts by volume of anhydrous ethanol and 1 part by volume of deionized water. 0.1 mol / L hydrochloric acid was added to adjust the pH of the system to 5, and the mixture was stirred at 60°C for 2.5 h to obtain an oligomeric silanol solution. 2 parts by mass of material A were dispersed in 40 parts by mass of anhydrous ethanol. 0.01 parts by mass of trisilyl isooctyl-POSS and 0.1 parts by mass of the oligomeric silanol solution were added. The mixture was heated at 70°C, stirred, refluxed, and cooled for 4 h. It was then filtered under reduced pressure and vacuum dried at 80°C for 8 h to obtain material B. 3.5 parts by mass of carnauba wax were melted to 95°C and sprayed onto 100 parts by mass of material B. After cooling, the mixture was passed through a 120-mesh sieve to obtain modified carbide slag.

[0039] Add 70 parts by weight of S95 grade granulated blast furnace slag powder, 50 parts by weight of Grade II F fly ash, 2.5 parts by weight of chopped basalt fiber, and 20 parts by weight of modified carbide slag to a mixer and dry mix for 3 minutes. Add 370 parts by weight of aggregate composed of manufactured sand with a fineness modulus of 3.0 and crushed stone with a particle size of 15mm in a mass ratio of 15:22 and continue to dry mix for 3 minutes. Mix 25 parts by weight of alkali activator with a solution modulus of 1 composed of water glass, sodium hydroxide, and water in a mass ratio of 46:12:18, 1.0 part by weight of polycarboxylate superplasticizer, 0.6 parts by weight of sodium tartrate, and 25 parts by weight of mixing water evenly and pour into the mixer. In the process of wet mixing for 5 minutes, low-carbon composite cement concrete is obtained. BFRP bars and non-metallic binding wires are braided into a pole skeleton with a reinforcement ratio of 1.5%, and placed into a centrifugal steel mold. The low-carbon composite cement concrete is then placed into the steel mold, the mold is closed, and centrifuged at a rate of 80 r / min for 5 minutes, then at a rate of 200 r / min for 5 minutes, and then at a rate of 400 r / min for 12 minutes for centrifugation molding. The mold is then left to stand still for 1.5 hours, and the temperature is raised to 70℃ at a rate of 20℃ / h. The temperature is then kept constant for 6 hours, and then naturally cooled to room temperature. After demolding, the pole is naturally cured at room temperature for 14 days to obtain the low-carbon composite cement pole.

[0040] Example 4 100 parts by weight of dried carbide slag with a particle size of 12 μm were placed in a high-speed mixer and preheated to 90°C. 1.6 parts by weight of molten stearic acid were sprayed in under a nitrogen atmosphere and stirred for 22 min to obtain material A. One volume of tetraethyl orthosilicate was added to a mixed solvent consisting of 4 volumes of anhydrous ethanol and 1 volume of deionized water. 0.1 mol / L hydrochloric acid was added to adjust the pH of the system to 4.2, and the mixture was stirred at 60°C for 1.8 h to obtain an oligomeric silanol solution. 1.2 parts by weight of material A were dispersed in 32 parts by weight of anhydrous ethanol. 0.006 parts by weight of trisilyl isooctyl-POSS and 0.06 parts by weight of oligomeric silanol solution were added. The mixture was heated and stirred at 62°C under reflux for 3.5 hours, then filtered under reduced pressure and dried under vacuum at 80°C for 6.5 hours to obtain material B. 0.04 parts by weight of titanate coupling agent KH-101 were mixed with 20 parts by weight of cyclohexanone. After thorough mixing, 2 parts by weight of nano-calcium carbonate were added, and the mixture was stirred at 60°C for 1 hour. The solid phase was collected by suction filtration, washed, and dried to obtain KH-101 modified nano-calcium carbonate; 5 mL of silane coupling agent KH-570 was added to a mixed solvent consisting of 85.5 mL of anhydrous ethanol and 9.5 mL of deionized water, and 0.1 mol / L glacial acetic acid was added to adjust the pH of the system to 4. The mixture was stirred for 30 min to obtain KH-570 hydrolysate; 3 parts by mass of nano-silica were mixed with 20 parts by mass of cyclohexanone, ultrasonically dispersed for 10 min, and then added... Add 8 parts by mass of KH-570 hydrolysate, stir at 80℃ for 2 hours, filter, take the solid phase, wash and dry to obtain KH-570 modified nano silica; mix material B, KH-101 modified nano calcium carbonate and KH-570 modified nano silica at a mass ratio of 100:3:1 to obtain material C; take 2.5 parts by mass of carnauba wax, melt to 90℃, spray coating 100 parts by mass of material C, cool, and pass through an 80-mesh sieve to obtain modified carbide slag.

[0041] Add 55 parts by weight of S95 grade granulated blast furnace slag powder, 35 parts by weight of Grade II F fly ash, 1.8 parts by weight of chopped basalt fiber, and 12 parts by weight of modified carbide slag to a mixer and dry mix for 2.5 minutes. Add 320 parts by weight of aggregate composed of manufactured sand with a fineness modulus of 2.7 and crushed stone with a particle size of 8 mm in a mass ratio of 13:19 and continue to dry mix for 2.5 minutes. Mix 18 parts by weight of alkali activator with a solution modulus of 1 composed of water glass, sodium hydroxide, and water in a mass ratio of 43:11:19, 0.6 parts by weight of polycarboxylate superplasticizer, 0.3 parts by weight of sodium tartrate, and 18 parts by weight of mixing water evenly and pour into the mixer. In the machine, wet mixing for 4 minutes yields low-carbon composite cement concrete. BFRP bars and non-metallic binding wires are braided into a pole frame with a reinforcement ratio of 1.2%, and placed into a centrifugal steel mold. The low-carbon composite cement concrete is then placed into the mold, and the mold is closed. The pole is centrifuged at 65 r / min for 3 minutes, then at 180 r / min for 3 minutes, and then at 380 r / min for 9 minutes for further centrifugation. The mold is then left to stand for 1.2 hours, and the temperature is raised to 66℃ at a rate of 12℃ / h. It is then kept at this temperature for 4.5 hours, and then allowed to cool naturally to room temperature. After demolding, it is naturally cured at room temperature for 14 days to obtain the low-carbon composite cement pole.

[0042] Example 5 100 parts by weight of dried carbide slag with a particle size of 15 μm were placed in a high-speed mixer and preheated to 90°C. 1.8 parts by weight of molten stearic acid were sprayed in under a nitrogen atmosphere and stirred for 25 min to obtain material A. One volume part of tetraethyl orthosilicate was added to a mixed solvent consisting of 4 volumes of anhydrous ethanol and 1 volume of deionized water. 0.1 mol / L hydrochloric acid was added to adjust the pH of the system to 4.5, and the mixture was stirred at 60°C for 2.0 h to obtain an oligomeric silanol solution. 1. 5 parts by weight of material A were dispersed in 35 parts by weight of anhydrous ethanol. 0.008 parts by weight of trisilyl isooctyl-POSS and 0.08 parts by weight of oligomeric silanol solution were added. The mixture was heated and stirred at 65°C under reflux for 3.5 hours, then filtered under reduced pressure and dried under vacuum at 80°C for 7 hours to obtain material B. 0.05 parts by weight of titanate coupling agent KH-101 were mixed with 25 parts by weight of cyclohexanone. After thorough mixing, 3 parts by weight of nano-calcium carbonate were added, and the mixture was stirred at 60°C for 1.5 hours. The mixture was then filtered and collected. Solid-phase washing and drying yielded KH-101 modified nano-calcium carbonate. 5 mL of silane coupling agent KH-570 was added to a mixed solvent consisting of 85.5 mL anhydrous ethanol and 9.5 mL deionized water. 0.1 mol / L glacial acetic acid was added to adjust the pH to 4.5, and the mixture was stirred for 35 min to obtain KH-570 hydrolysate. 3.5 parts by weight of nano-silica and 25 parts by weight of cyclohexanone were mixed and ultrasonically dispersed for 15 min. Then, 9 parts by weight of... A certain amount of KH-570 hydrolysate was stirred at 80℃ for 2.5h, filtered, and the solid phase was washed and dried to obtain KH-570 modified nano silica. Material B, KH-101 modified nano calcium carbonate and KH-570 modified nano silica were mixed evenly at a mass ratio of 100:4:1.5 to obtain material C. 3.0 parts by mass of carnauba wax were melted to 93℃ and sprayed onto 100 parts by mass of material C. After cooling, the mixture was passed through a 100-mesh sieve to obtain modified carbide slag.

[0043] Add 60 parts by weight of S95 grade granulated blast furnace slag powder, 40 parts by weight of Class II F fly ash, 2.0 parts by weight of chopped basalt fiber, and 15 parts by weight of modified carbide slag to a mixer and dry mix for 2.5 minutes. Add 335 parts by weight of aggregate composed of manufactured sand with a fineness modulus of 2.8 and crushed stone with a particle size of 10 mm in a mass ratio of 13:20 and continue to dry mix for 2.5 minutes. Mix 20 parts by weight of alkali activator with a solution modulus of 1 composed of water glass, sodium hydroxide, and water in a mass ratio of 44:11:20, 0.8 parts by weight of polycarboxylate superplasticizer, 0.4 parts by weight of sodium tartrate, and 20 parts by weight of mixing water evenly and pour into the mixer. In the mixer, wet mixing for 4 minutes yields low-carbon composite cement concrete. BFRP reinforcement and non-metallic binding wire are braided into a pole frame with a reinforcement ratio of 1.3%, and placed into a centrifugal steel mold. The low-carbon composite cement concrete is then placed into the mold, and the mold is closed. The pole is centrifuged at 70 r / min for 4 minutes, then at 180 r / min for 4 minutes, and then at 380 r / min for 10 minutes for further centrifugation. The mold is then left to stand for 1.3 hours, and the temperature is raised to 68℃ at a rate of 15℃ / h. It is then cured at this constant temperature for 5 hours, followed by natural cooling to room temperature. After demolding, it is naturally cured at room temperature for 14 days to obtain the low-carbon composite cement pole.

[0044] Example 6 100 parts by weight of dried carbide slag with a particle size of 18 μm were placed in a high-speed mixer and preheated to 90°C. 1.9 parts by weight of molten stearic acid were sprayed in under a nitrogen atmosphere and stirred for 28 min to obtain material A. One volume of tetraethyl orthosilicate was added to a mixed solvent consisting of 4 volumes of anhydrous ethanol and 1 volume of deionized water. 0.1 mol / L hydrochloric acid was added to adjust the pH of the system to 4.9, and the mixture was stirred at 60°C for 2.2 h to obtain an oligomeric silanol solution. 0.75 parts by weight of material A were dispersed in 37 parts by weight of anhydrous ethanol. 0.009 parts by weight of trisilyl isooctyl-POSS and 0.08 parts by weight of oligomeric silanol solution were added. The mixture was heated and stirred at 68°C under reflux for 3.5 hours, then filtered under reduced pressure and dried under vacuum at 80°C for 7.5 hours to obtain material B. 0.06 parts by weight of titanate coupling agent KH-101 were mixed with 30 parts by weight of cyclohexanone and stirred until homogeneous. Then, 4 parts by weight of nano-calcium carbonate were added, and the mixture was stirred at 60°C for 2 hours. Filter the solid phase, collect it, wash and dry it to obtain KH-101 modified nano-calcium carbonate; take 5 mL of silane coupling agent KH-570 and add it to a mixed solvent consisting of 85.5 mL of anhydrous ethanol and 9.5 mL of deionized water, add 0.1 mol / L glacial acetic acid to adjust the pH of the system to 5, stir for 40 min to obtain KH-570 hydrolysate; take 4 parts by mass of nano-silica and 30 parts by mass of cyclohexanone, mix them, sonicate for 20 min, and then add 1 0 parts by weight of KH-570 hydrolysate were stirred at 80℃ for 3 hours, filtered, and the solid phase was washed and dried to obtain KH-570 modified nano silica. Material B, KH-101 modified nano calcium carbonate and KH-570 modified nano silica were mixed evenly at a mass ratio of 100:5:2 to obtain material C. 3.5 parts by weight of carnauba wax were melted to 95℃ and sprayed onto 100 parts by weight of material C. After cooling, the mixture was passed through a 120-mesh sieve to obtain modified carbide slag.

[0045] Add 65 parts by weight of S95 grade granulated blast furnace slag powder, 48 parts by weight of Grade II F fly ash, 2.3 parts by weight of chopped basalt fiber, and 18 parts by weight of modified carbide slag to a mixer and dry mix for 3 minutes. Add 360 parts by weight of aggregate composed of manufactured sand with a fineness modulus of 2.9 and crushed stone with a particle size of 13 mm in a mass ratio of 14:21 and continue to dry mix for 2.5 minutes. Add 23 parts by weight of alkali activator with a solution modulus of 1 composed of water glass, sodium hydroxide, and water in a mass ratio of 45:12:21, 0.9 parts by weight of polycarboxylate superplasticizer, 0.55 parts by weight of sodium tartrate, and 25 parts by weight of mixing water and mix evenly. Pour into the mixer. In the machine, wet mixing for 5 minutes yields low-carbon composite cement concrete. BFRP bars and non-metallic binding wires are braided into a pole frame with a reinforcement ratio of 1.5%, and placed into a centrifugal steel mold. The low-carbon composite cement concrete is then placed into the mold, and the mold is closed. The pole is centrifuged at 80 r / min for 5 minutes, then at 200 r / min for 5 minutes, and then at 400 r / min for 12 minutes for further centrifugation. The mold is then left to stand for 1.5 hours, and the temperature is raised to 70℃ at a rate of 20℃ / h. It is then cured at this constant temperature for 6 hours, followed by natural cooling to room temperature. After demolding, it is naturally cured at room temperature for 14 days to obtain the low-carbon composite cement pole.

[0046] Comparative Example 1 The difference from Example 5 is that the preparation method of this modified calcium carbide slag includes the following steps: 1 volume part of tetraethyl orthosilicate is added to a mixed solvent consisting of 4 volume parts of anhydrous ethanol and 1 volume part of deionized water, and 0.1 mol / L hydrochloric acid is added to adjust the pH of the system to 4.5. The mixture is stirred at 60°C for 2.0 h to obtain an oligomeric silanol solution. 1.5 mass parts of dried calcium carbide slag with a particle size of 15 μm are dispersed in 35 mass parts of anhydrous ethanol, and 0.008 mass parts of trisilyl isooctyl-POSS and 0.08 mass parts of the oligomeric silanol solution are added. The mixture is heated, stirred, refluxed, and cooled at 65°C for 3.5 h, filtered under reduced pressure, and dried under vacuum at 80°C for 7 h to obtain material B. 0.05 mass parts of titanate coupling agent KH-101 are mixed with 25 mass parts of cyclohexanone, stirred evenly, and 3 mass parts of nano-calcium carbonate are added. The mixture is stirred at 60°C for 1.5 h, filtered, and the solid phase is collected, washed, and dried to obtain KH-10. 1. Modified nano-calcium carbonate: 5 mL of silane coupling agent KH-570 was added to a mixed solvent consisting of 85.5 mL of anhydrous ethanol and 9.5 mL of deionized water. 0.1 mol / L glacial acetic acid was added to adjust the pH of the system to 4.5. The mixture was stirred for 35 min to obtain KH-570 hydrolysate. 3.5 parts by mass of nano-silica and 25 parts by mass of cyclohexanone were mixed and ultrasonically dispersed for 15 min. Then, 9 parts by mass of KH-570 hydrolysate were added. The mixture was stirred at 80 °C for 2.5 h, filtered, and the solid phase was washed and dried to obtain KH-570 modified nano-silica. Material B, KH-101 modified nano-calcium carbonate, and KH-570 modified nano-silica were mixed evenly at a mass ratio of 100:4:1.5 to obtain material C. 3.0 parts by mass of carnauba wax were melted to 93 °C and sprayed onto 100 parts by mass of material C. The mixture was cooled and passed through a 100-mesh sieve to obtain modified calcium carbide slag.

[0047] Comparative Example 2 The difference from Example 5 is that the preparation method of this modified calcium carbide slag includes the following steps: 100 parts by mass of dried calcium carbide slag with a particle size of 15 μm is placed in a high-speed mixer, preheated to 90°C, and 1.8 parts by mass of molten stearic acid is sprayed in under a nitrogen atmosphere and stirred for 25 min to obtain material A; 0.05 parts by mass of titanate coupling agent KH-101 and 25 parts by mass of cyclohexanone are mixed and stirred evenly, then 3 parts by mass of nano-calcium carbonate is added, stirred at 60°C for 1.5 h, filtered, the solid phase is collected, washed, and dried to obtain KH-101 modified nano-calcium carbonate; 5 mL of silane coupling agent KH-570 is added to a mixed solvent composed of 85.5 mL of anhydrous ethanol and 9.5 mL of deionized water, and 0... The pH of the system was adjusted to 4.5 with 0.1 mol / L glacial acetic acid and stirred for 35 min to obtain KH-570 hydrolysate. 3.5 parts by mass of nano-silica and 25 parts by mass of cyclohexanone were mixed and ultrasonically dispersed for 15 min. Then, 9 parts by mass of KH-570 hydrolysate were added, and the mixture was stirred at 80℃ for 2.5 h. After filtration, the solid phase was washed and dried to obtain KH-570 modified nano-silica. Material A, KH-101 modified nano-calcium carbonate, and KH-570 modified nano-silica were mixed evenly at a mass ratio of 100:4:1.5 to obtain material C. 3.0 parts by mass of carnauba wax were melted to 93℃ and sprayed onto 100 parts by mass of material C. After cooling, the mixture was passed through a 100-mesh sieve to obtain modified carbide slag.

[0048] Comparative Example 3 The difference from Example 5 is that the preparation method of this modified calcium carbide slag includes the following steps: 100 parts by mass of dried calcium carbide slag with a particle size of 15 μm is placed in a high-speed mixer, preheated to 90°C, and 1.8 parts by mass of molten stearic acid is sprayed in under a nitrogen atmosphere and stirred for 25 min to obtain material A; 1 part by volume of tetraethyl orthosilicate is added to a mixed solvent composed of 4 parts by volume of anhydrous ethanol and 1 part by volume of deionized water, and 0.1 mol / L hydrochloric acid is added to adjust the pH of the system to 4.5, and stirred at 60°C for 2.0 h to obtain an oligomeric silanol solution; 1.5 parts by mass of material A is dispersed in 35 parts by mass of anhydrous ethanol, and 0.008 parts by mass of trisilyl isooctyl-POSS and 0.08 parts by mass of oligomeric silanol solution are added, heated and stirred at 65°C, refluxed for 3.5 h, filtered under reduced pressure, and vacuum dried at 80°C for 7 h to obtain material B; 0.05 parts by mass of titanate coupling agent KH-101 and 25 parts by mass of... Cyclohexanone was mixed and stirred until homogeneous. Then, 3 parts by weight of nano-calcium carbonate were added, and the mixture was stirred at 60℃ for 1.5 h. The mixture was then filtered, and the solid phase was collected, washed, and dried to obtain KH-101 modified nano-calcium carbonate. 5 mL of silane coupling agent KH-570 was added to a mixed solvent consisting of 85.5 mL of anhydrous ethanol and 9.5 mL of deionized water. 0.1 mol / L glacial acetic acid was added to adjust the pH of the system to 4.5, and the mixture was stirred for 35 min to obtain KH-570 water. Hydrolysate; Take 3.5 parts by weight of nano-silica and 25 parts by weight of cyclohexanone, mix them, ultrasonically disperse for 15 min, then add 9 parts by weight of KH-570 hydrolysate, stir at 80℃ for 2.5 h, filter, take the solid phase, wash and dry to obtain KH-570 modified nano-silica; Mix material B, KH-101 modified nano-calcium carbonate and KH-570 modified nano-silica at a mass ratio of 100:4:1.5 to obtain modified carbide slag.

[0049] Comparative Example 4 The difference from Example 5 is that the preparation method of this modified calcium carbide slag includes the following steps: 100 parts by mass of dried calcium carbide slag with a particle size of 15 μm is placed in a high-speed mixer, preheated to 90°C, and 1.8 parts by mass of molten stearic acid is sprayed in under a nitrogen atmosphere and stirred for 25 min to obtain material A; 1 part by volume of tetraethyl orthosilicate is added to a mixed solvent composed of 4 parts by volume of anhydrous ethanol and 1 part by volume of deionized water, and 0.1 mol / L hydrochloric acid is added to adjust the pH of the system to 4.5, and stirred at 60°C for 2.0 h to obtain an oligomeric silanol solution; 1.5 parts by mass of material A is dispersed in 35 parts by mass of anhydrous ethanol, and 0.008 parts by mass of trisilyl isooctyl-POSS and 0.08 parts by mass of the oligomeric silanol solution are added, heated and stirred at 65°C under reflux for 3.5 h, filtered under reduced pressure, and dried under vacuum at 80°C for 7 h to obtain material A. Material B: Take 5 mL of silane coupling agent KH-570 and add it to a mixed solvent consisting of 85.5 mL of anhydrous ethanol and 9.5 mL of deionized water. Add 0.1 mol / L glacial acetic acid to adjust the pH of the system to 4.5, stir for 35 min, and obtain KH-570 hydrolysate. Take 3.5 parts by mass of nano silica and 25 parts by mass of cyclohexanone, mix them, and ultrasonically disperse for 15 min. Then add 9 parts by mass of KH-570 hydrolysate, stir at 80℃ for 2.5 h, filter, take the solid phase, wash and dry, and obtain KH-570 modified nano silica. Mix material B and KH-570 modified nano silica at a mass ratio of 100:5.5 to obtain material C. Take 3.0 parts by mass of carnauba wax, melt it to 93℃, spray it onto 100 parts by mass of material C, cool it, and pass it through a 100-mesh sieve to obtain modified carbide slag.

[0050] Comparative Example 5 The difference from Example 5 is that the preparation method of this modified calcium carbide slag includes the following steps: 100 parts by mass of dried calcium carbide slag with a particle size of 15 μm is placed in a high-speed mixer, preheated to 90°C, and 1.8 parts by mass of molten stearic acid is sprayed in under a nitrogen atmosphere and stirred for 25 min to obtain material A; 1 part by volume of tetraethyl orthosilicate is added to a mixed solvent composed of 4 parts by volume of anhydrous ethanol and 1 part by volume of deionized water, and 0.1 mol / L hydrochloric acid is added to adjust the pH of the system to 4.5, and stirred at 60°C for 2.0 h to obtain an oligomeric silanol solution; 1.5 parts by mass of material A is dispersed in 35 parts by mass of anhydrous ethanol, and 0.008 parts by mass of trisilyl isooctyl-POSS and 0.08 parts by weight of oligosilicone solution were heated and stirred at 65°C, refluxed for 3.5 h, filtered under reduced pressure, and dried under vacuum at 80°C for 7 h to obtain material B; 0.05 parts by weight of titanate coupling agent KH-101 and 25 parts by weight of cyclohexanone were mixed and stirred evenly, and then 3 parts by weight of nano-calcium carbonate were added. The mixture was stirred at 60°C for 1.5 h, filtered, and the solid phase was collected, washed, and dried to obtain KH-101 modified nano-calcium carbonate; material B and KH-101 modified nano-calcium carbonate were mixed evenly at a mass ratio of 100:5.5 to obtain material C; 3.0 parts by weight of carnauba wax were melted to 93°C, sprayed onto 100 parts by weight of material C, cooled, and passed through a 100-mesh sieve to obtain modified carbide slag.

[0051] Performance testing The low-carbon composite cement concrete and utility pole products prepared in Examples 1-6 and Comparative Examples 1-5 were subjected to the following performance tests: 1) Condensation time was tested according to standard GB / T 1346-2011, and the test results are shown in Table 1 below; Table 1

[0052] 2) Mechanical strength performance was tested according to standards GB / T 17671-2021 and GB / T 50081-2019. The test results are shown in Table 2 below. Table 2

[0053] 3) The drying shrinkage test was conducted according to standard JC / T 603-2004, and the test results are shown in Table 3 below; Table 3

[0054] 4) The water absorption rate, chloride ion permeability and freeze-thaw resistance were tested according to the standard GB / T 50082-2009. The test results are shown in Table 4 below. Table 4

[0055] 5) The mechanical properties of the utility poles were tested according to standard GB / T 4623-2014, and the test results are shown in Table 5 below; Table 5

[0056] As can be seen from the above test results, the low-carbon composite cement concrete and the finished utility poles made therefrom prepared in Examples 1-6 of the present invention have better product performance than the comparative examples.

[0057] Comparative Example 1 directly uses raw calcium carbide slag, omitting the process of in-situ reaction of molten stearic acid under nitrogen atmosphere to generate calcium stearate monolayer. The inner buffer and slow-release structure is completely missing, the setting time is drastically shortened, the mechanical strength is reduced, the drying shrinkage is greatly increased, the waterproof, chloride ion resistance and antifreeze performance are deteriorated, the alkali component is excessively consumed in the early stage, the reserve that can participate in crack self-healing in the later stage is insufficient, the calcium carbonate crystallization sealing efficiency is reduced, there are many internal cracks in the rod body and the interface bonding is weak, and the cracking bending moment and the failure bending moment are much lower than those in Example 5. Comparative Example 2 did not introduce trisilyl isooctyl-POSS and oligosilanol, lacking the intermediate silicon-oxygen composite bridging network, resulting in a shortened setting time, insufficient mechanical strength, high drying shrinkage, weakened impermeability and freeze-thaw resistance, and insufficient self-healing ability. Comparative Example 3 was not coated with the outermost layer of carnauba wax, lacked a physical hydrophobic barrier and delayed activation structure, had a shorter setting time, reduced mechanical strength, premature and excessive local reaction, resulting in severe volume shrinkage, poor structural stability, extremely poor waterproof and seepage-proof performance, almost no ability to self-heal, and reduced load-bearing capacity of the utility pole. Comparative Example 4 retained only KH-570 modified nano-SiO2, the setting time was basically normal, the mechanical strength decreased slightly, the drying shrinkage and impermeability were slightly worse, and the self-healing ability was significantly reduced. Comparative Example 5, after removing KH-570 modified nano-SiO2, showed a basically normal setting time, a slight decrease in mechanical strength, weak drying shrinkage and impermeability, and poor self-healing effect.

[0058] The embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, features in the embodiments of the present invention can be combined with each other unless otherwise specified.

Claims

1. A manufacturing process for a low-carbon composite cement utility pole, characterized in that, Includes the following steps: Low-carbon composite cement concrete is obtained by uniformly mixing slag powder, fly ash, chopped basalt fiber, modified carbide slag, aggregate, alkali activator, water reducing agent, retarder and mixing water. The concrete is placed in a steel mold containing a skeleton, the mold is closed, centrifuged, steam cured, demolded and naturally cured to obtain the low-carbon composite cement pole. The modified calcium carbide slag is prepared by in-situ modification of calcium carbide slag with molten stearic acid, generating calcium stearate on its surface, grafting cage-like polysilsesquioxane and oligomeric silanol, and then spraying with molten carnauba wax.

2. The preparation process of a low-carbon composite cement utility pole according to claim 1, characterized in that, The preparation method of the modified carbide slag specifically includes the following steps: S1. Molten stearic acid is sprayed onto the surface of carbide slag in a nitrogen atmosphere to obtain material A; S2. Disperse the material A in anhydrous ethanol, add trisilyl isooctyl-POSS and oligosilanol solution, heat and stir, filter and dry to obtain material B; S3. Take molten carnauba wax and spray it onto the surface of material B to obtain modified carbide slag.

3. The preparation process of a low-carbon composite cement utility pole according to claim 2, characterized in that, Step S3 further includes the following steps: dispersing material A in anhydrous ethanol, adding trisilyl isooctyl-POSS and oligosiloxane solution, heating and stirring at 60-70℃ and refluxing for 3-4 hours, filtering under reduced pressure and drying, adding KH-101 modified nano calcium carbonate and KH-570 modified nano silica and mixing evenly to obtain material B.

4. The preparation process of a low-carbon composite cement utility pole according to claim 2, characterized in that, In step S1, the particle size of the carbide slag is 10-20 μm; the mass ratio of the carbide slag to stearic acid is 100:1.5-2.

0.

5. The preparation process of a low-carbon composite cement utility pole according to claim 2, characterized in that, In step S2, the mass ratio of material A, anhydrous ethanol, trisilyl isooctyl-POSS, and oligosiloxane solution is 1-2:30-40:0.005-0.01:0.05-0.1; the preparation method of oligosiloxane is as follows: take tetraethyl orthosilicate and add it to a mixed solvent of anhydrous ethanol / deionized water, adjust the pH of the system to acidic, heat and stir to obtain oligosiloxane solution.

6. The preparation process of a low-carbon composite cement utility pole according to claim 2, characterized in that, In step S3, the mass ratio of material B to carnauba wax is 100:2.5-3.

5.

7. A low-carbon composite cement utility pole, characterized in that, The low-carbon composite cement pole is prepared using the preparation method of any one of claims 1-6, wherein the mass ratio of slag powder, fly ash, chopped basalt fiber, modified carbide slag, aggregate, alkali activator, water-reducing agent, retarder and mixing water is 50-70:30-50:1.5-2.5:10-20:300-370:15-25:0.5-1.0:0.2-0.6:15-25.

8. A low-carbon composite cement utility pole according to claim 7, characterized in that, The aggregate is composed of manufactured sand with a fineness modulus of 2.6-3.0 and crushed stone with a particle size of 5-15mm in a mass ratio of 12-15:18-22.

9. A low-carbon composite cement utility pole according to claim 7, characterized in that, The alkaline activator is composed of water glass, sodium hydroxide and water in a mass ratio of 42-46:10-12:18-22.

10. A low-carbon composite cement utility pole according to claim 7, characterized in that, The slag powder is S95 grade granulated blast furnace slag powder; the fly ash is Class II F fly ash; the water-reducing agent is a polycarboxylate water-reducing agent; and the retarder is selected from at least one of sodium gluconate, sodium tartrate, and borax.

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