CN113045266A - Self-repairing fiber reinforced ultra-high performance concrete pole and processing method thereof - Google Patents
Self-repairing fiber reinforced ultra-high performance concrete pole and processing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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Abstract
The invention discloses a self-repairing fiber reinforced ultrahigh-performance concrete pole and a processing method thereof, wherein the self-repairing fiber reinforced ultrahigh-performance concrete pole comprises a reinforcement cage, self-repairing fiber reinforced ultrahigh-performance concrete is coated outside the reinforcement cage, and the self-repairing fiber reinforced ultrahigh-performance concrete comprises the following raw materials: 40-60 parts of compound glue core fiber; 950 to 1000 portions of Portland cement; 160-170 parts of rice hull ash; 900 to 1200 parts of bauxite; 70-90 parts of glass powder; 50-70 parts of polypropylene fiber; 145-170 parts of water; 40-60 parts of a carboxylic acid water reducing agent. By adding the short and thin repairing glue solution core fiber, when a concrete structure generates cracks, seepage liquid is leaked to repair the cracks, so that the corrosion and the oxidation of reinforcing steel bars can be prevented, and the concrete structure can be regenerated when damaged, and has the characteristics of ultrahigh strength, high toughness, high durability, high volume stability and the like.
Description
Technical Field
The invention relates to a novel composite material concrete pole on overhead power transmission and transformation lines, broadcasting lines, post and telecommunications lines, communication lines and lighting lines, in particular to a self-repairing fiber reinforced ultrahigh-performance concrete pole and a processing method thereof.
Background
Ultra-High Performance Concrete (UHPC) is also called Reactive Powder Concrete (RPC), and is the most innovative cement-based engineering material in the last thirty years, and the Performance of the engineering material is greatly expanded. The self-repairing concrete is prepared by adding a carrier for wrapping an adhesive into concrete, wherein when the concrete cracks, the outer-layer wrapper of the adhesive breaks, the adhesive flows out, the crack is filled with the adhesive, and finally the crack is sealed. The self-healing concrete is prepared by adding a substance capable of blocking cracks into concrete, wherein the substance is activated when meeting water to generate crystals which are deposited on the surfaces of the cracks, the crystals are continuously increased to be deposited around the cracks, and the cracked parts of the concrete are gradually filled and compacted. The self-repairing ultrahigh-performance concrete is used in the aspect of railway bridges, and other prefabricated parts are still blank in the laboratory stage at present.
The design theory of ultra-high performance concrete is maximum packing density theory (dense particulate packing), and particles with different particle diameters of the composition materials form the closest packing in the optimal proportion, namely, gaps formed by the stacking of millimeter-sized particles (aggregates) are filled with micron-sized particles (cement, fly ash and mineral powder), and gaps formed by the stacking of micron-sized particles are filled with submicron-sized particles (silica fume). Andressen established a mathematical model of the maximum packing density theory as early as 1931. However, until the end of the seventies of the last century, the first generation of ultra-high performance concrete formulated using this model design was born in the university of Beton laboratory, Denmark, as CRC (Compact Reinforced Composite), based on the dramatic improvement in superplasticizer technology and product performance. CRC achieves basically the same mechanical property with the current UHPC, the maximum compression strength exceeds 400MPa, sintered bauxite is used as aggregate, and polypropylene fiber is used to improve the toughness of the material, so the composite material is called.
The key laboratory of intelligent materials and structural aviation science and technology of Nanjing aerospace university is in the leading position in the research field of intelligent composite materials in China. In 1997, they studied a method for self-diagnosing and self-repairing damage in composite structures using liquid-core optical fibers and shape memory alloys (sMA wires). The overall protocol was analyzed and preliminary experiments were performed with epoxy FA4 and epoxy E51: the liquid core optical fiber and the shape memory alloy are embedded into concrete, emergent light of the optical fiber is received by a photosensitive tube, when the concrete is damaged, a self-diagnosis and self-repair network formed by the liquid core optical fiber enables glue to flow into the damaged part, meanwhile, SMA short fibers at the damaged part are locally excited to generate local compressive stress, the liquid core optical fiber at the damaged part is broken, the glue flows out, the damaged part is self-repaired, and after an adhesive contained in the liquid core optical fiber flows to the damaged part, heat generated during SMA excitation greatly improves curing quality, so that self-repair is better completed.
Concrete is the most widely used building material in the world. But it is a brittle material and is prone to cracking during construction or use. When the crack is small, it is visually unsafe to use, although it does not affect the force-bearing performance. And the cracks are larger and larger along with the lapse of time, the cracks are large to a certain degree, water or aggressive chemicals enter the cracks, concrete and steel bars at the cracks are corroded, the stress performance of concrete members is affected finally, brittle fracture is likely to happen more seriously, catastrophic accidents are generated, and irreparable loss is brought to the society.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a self-repairing fiber reinforced ultrahigh-performance concrete electric pole and a processing method of the self-repairing fiber reinforced ultrahigh-performance concrete electric pole.
According to the self-repairing fiber reinforced ultrahigh-performance concrete pole provided by the embodiment of the first aspect of the invention, the self-repairing fiber reinforced ultrahigh-performance concrete pole comprises a reinforcement cage, self-repairing fiber reinforced ultrahigh-performance concrete is coated outside the reinforcement cage, and the self-repairing fiber reinforced ultrahigh-performance concrete is composed of the following raw materials in parts by mass:
40-60 parts of compound glue core fiber;
950 to 1000 portions of Portland cement;
160-170 parts of rice hull ash;
900 to 1200 parts of bauxite;
70-90 parts of glass powder;
50-70 parts of polypropylene fiber;
145-170 parts of water;
40-60 parts of a carboxylic acid water reducing agent.
According to the self-repairing fiber reinforced ultrahigh-performance concrete pole provided by the embodiment of the invention, all materials are inorganic materials, the pole is green and environment-friendly, the using amount of non-renewable natural resource aggregates in the production process, and the pole is composed of ultrafine active powder, cement, high-quality fine aggregates, high-strength fibers and the like, the pole is prepared by optimizing gradation design and through specific processes such as high-temperature heat sealing, short and fine repairing glue core fibers are added, when cracks are generated in a concrete structure, liquid seeps out to repair the cracks, so that the corrosion and oxidation of reinforcing steel bars can be prevented, the pole can be regenerated when damaged, and the pole has the characteristics of ultrahigh strength, high toughness, high durability, high volume stability and the like, so that the problems in the background technology are solved.
According to some embodiments of the invention, the diameter of the repair glue core fiber is 0.5mm, the wall thickness is 0.2mm, the length is 40mm, polyurethane and acrylic ester are injected as a repair agent, and the doping amount of the repair agent is 0.02%.
According to some embodiments of the present invention, the portland cement is p.ii 52.5R-type early strength cement, and a mixed material of limestone or granulated blast furnace slag having a particle size of 30 to 60 μm is added in an amount of not more than 5% by mass of the cement.
According to some embodiments of the invention, the rice hull ash is ash obtained by burning rice hulls and the chemical composition comprises SiO2、Al2O3、K2O, NaO, CaO and unburned carbon, SiO2The content of (1) is 80-95%, the particle size is 0.05-0.30 μm, and the specific surface area is not less than 400 square meters per k Ag.
According to some embodiments of the invention, the bauxite is bauxite with a particle size of 0.16-1.25 mm
According to some embodiments of the invention, the glass frit has a particle size of 1-13 um; the apparent surface value is 2700kg/m3(ii) a A glass frit having a mohs hardness of 7.8.
According to some embodiments of the invention, the polypropylene fibers have a length of 20 mm; the diameter is 0.13 mm; the tensile strength is more than or equal to 1000 MPa; elongation at break of 15%; the mixing amount of the polypropylene fiber with alkali resistance of 100 percent is 0.07 percent.
According to some specific embodiments of the invention, the self-repairing fiber reinforced ultrahigh-performance concrete is coated on the outer side of the reinforcement cage to form a self-repairing fiber reinforced ultrahigh-performance concrete layer, and the thickness of the self-repairing fiber reinforced ultrahigh-performance concrete layer is 7-10 mm; the steel reinforcement cage is as main muscle, ordinary hot rolling ribbed steel bar as supplementary muscle, high-strength cold wire drawing by the prestressed wire and makes the stirrup, and two high-strength cold wire drawing alternately are rhombus and encircle the ligature of main muscle, and are less than or equal to 50mm apart from the high-strength cold wire drawing interval that both ends are less than 150cm department, and are greater than or equal to 70mm apart from both ends high-strength cold wire drawing interval that 150cm department.
According to some specific embodiments of the present invention, the self-healing fiber reinforced ultra-high performance concrete pole has an outer diameter that gradually increases in a top-to-bottom direction;
when the length of the self-repairing fiber reinforced ultrahigh-performance concrete pole is less than or equal to 10m, and the outer diameter of the upper end of the self-repairing fiber reinforced ultrahigh-performance concrete pole is less than or equal to 190mm, the wall thickness of the self-repairing fiber reinforced ultrahigh-performance concrete pole is less than or equal to 20 mm;
when the length of the self-repairing fiber reinforced ultrahigh-performance concrete electric pole is more than or equal to 12m and the outer diameter of the upper end of the self-repairing fiber reinforced ultrahigh-performance concrete electric pole is more than or equal to 190mm, the wall thickness of the self-repairing fiber reinforced ultrahigh-performance concrete electric pole is 30-50 mm.
According to the embodiment of the two aspects of the invention, the processing method of the self-repairing fiber reinforced ultrahigh-performance concrete pole comprises the following steps:
s1, prefabricating an electric pole mould of the high-strength reinforcement cage, and weighing the components according to the proportion;
s2, selecting weighed bauxite and polypropylene fiber, and stirring for 2 minutes;
s3, adding portland cement, rice hull ash and glass powder and stirring for 3 minutes;
s4, adding a carboxylic acid water reducing agent, weighing 60% of the total water, adding the water reducing agent into the mixture, and stirring for 2 minutes;
s5, adding the rest 40% of water, stirring for 3 minutes to prepare the ultrahigh-performance active powder concrete, pouring the ultrahigh-performance active powder concrete into a pole mould provided with a prefabricated high-strength reinforcement cage, applying prestress tension, compacting the concrete under the action of centrifugal force by rotating the mould at a high speed, curing the concrete in a steam pool with the mould at 100 ℃ for 8 hours, and performing pressure steam curing in a still kettle at 2Mpa to obtain the self-repairing fiber reinforced ultrahigh-performance concrete pole.
Has the advantages that:
compared with the prior art, the self-repairing fiber reinforced ultrahigh-performance concrete electric pole obtained by the preparation method of the self-repairing fiber reinforced ultrahigh-performance concrete electric pole provided by the embodiment of the invention
The self-repairing fiber reinforced ultrahigh-performance concrete pole is characterized in that a carrier for wrapping a repairing agent is added into concrete, when the concrete cracks, an outer-layer wrapping object of the repairing agent is broken, the repairing agent flows out to fill the cracks, finally the cracks are sealed, a substance capable of blocking the cracks is added into the concrete, the substance is activated when meeting water, crystals are generated and deposited on the surfaces of the cracks, the crystals are continuously added to precipitate around the cracks, and the cracked parts of the concrete are gradually filled compactly.
The self-repairing fiber reinforced ultra-high performance concrete pole is made of inorganic materials, is green and environment-friendly, reduces national building emission to be traditional concrete, has about half of CO2 emission compared with the production process of equivalent cement, has the use amount of non-renewable natural resource aggregate in the production process, is made of cement, rice hull ash, bauxite, glass powder, high-strength fibers, repairing glue fibers and the like, is prepared by specific processes such as high-temperature heat sealing and the like through optimized grading design, and is a high-technology composite material combining ultra-fine particle dense materials, fiber reinforcement and self-repairing capability technologies. Has the characteristics of ultrahigh strength, high toughness, high durability, high volume stability, self-repairing property and the like. The benefits provided by self-healing fiber reinforced ultra-high performance concrete poles are apparent.
The repair glue fiber is a typical brittle material, and has no yield extension stage, so long as the crack penetrates through the glass fiber, the glass fiber is immediately broken; chemical adhesion of the concrete to the contact surface of the repair cement fiber tube; the concrete is hardened and the glass fiber is tightly wrapped by the friction force. Repairing the expansion coefficient of the glue fiber: linear expansion coefficient of 1X 10-5 concrete: (1.0-1.4)1 x 10-5 can be stored in concrete for a long time, the strength is not changed, and the performance of the concrete is not influenced; can store various repairing cements for a long time without chemical reaction. The repair of the glue solution core fiber is a critical link for improving the durability of the concrete material, and the control and repair of the crack of the self-repair fiber reinforced ultrahigh-performance concrete pole are important links. The diameter of the repair glue solution core fiber is 0.5mm, the wall thickness is 0.2mm, the length is 40mm, polyurethane and acrylic ester are injected into the repair agent and are mixed in concrete, the repair glue solution core fiber with the physical triggering function sensitive to external stress is doped into concrete composition of the crack self-repair concrete pole based on the repair glue solution core fiber, an intelligent crack self-repair system is formed inside the crack self-repair concrete pole, the repair glue solution core fiber is uniformly distributed in the concrete of the pole through a typical concrete production process of the pole, and the repair glue solution core fiber material cannot be broken in the mixing and curing process. When the concrete pole is used, once a crack generates stress, the repairing glue core fiber is triggered to crack, the repairing agent is released, the crack is filled, and the purpose of repairing the crack is achieved. On the contrary, when the internal environment of the concrete pole is stable, namely no crack is generated, the repairing glue core fiber implanted into the concrete pole can stably exist in the matrix for a long time. The strength and the ductility of the self-repaired concrete are improved. The preparation process of the used repairing glue core fiber is simple to operate and easy to realize, and provides conditions for industrial mass production.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Self-healing fiber reinforced ultra-high performance concrete poles according to embodiments of the present invention are described below with reference to specific embodiments.
According to the self-repairing fiber reinforced ultrahigh-performance concrete pole provided by the embodiment of the first aspect of the invention, the self-repairing fiber reinforced ultrahigh-performance concrete pole comprises a reinforcement cage, self-repairing fiber reinforced ultrahigh-performance concrete is coated outside the reinforcement cage, and the self-repairing fiber reinforced ultrahigh-performance concrete is composed of the following raw materials in parts by mass:
40-60 parts of compound glue core fiber;
950 to 1000 portions of Portland cement;
160-170 parts of rice hull ash;
900 to 1200 parts of bauxite;
70-90 parts of glass powder;
50-70 parts of polypropylene fiber;
145-170 parts of water;
40-60 parts of a carboxylic acid water reducing agent.
According to the self-repairing fiber reinforced ultrahigh-performance concrete pole provided by the embodiment of the invention, all materials are inorganic materials, the pole is green and environment-friendly, the using amount of non-renewable natural resource aggregates in the production process, and the pole is composed of ultrafine active powder, cement, high-quality fine aggregates, high-strength fibers and the like, the pole is prepared by optimizing gradation design and through specific processes such as high-temperature heat sealing, short and fine repairing glue core fibers are added, when cracks are generated in a concrete structure, liquid seeps out to repair the cracks, so that the corrosion and oxidation of reinforcing steel bars can be prevented, the pole can be regenerated when damaged, and the pole has the characteristics of ultrahigh strength, high toughness, high durability, high volume stability and the like, so that the problems in the background technology are solved.
According to some embodiments of the invention, the diameter of the repair glue core fiber is 0.5mm, the wall thickness is 0.2mm, the length is 40mm, polyurethane and acrylic ester are injected as a repair agent, and the doping amount of the repair agent is 0.02%.
According to some embodiments of the present invention, the portland cement is p.ii 52.5R-type early strength cement, and a mixed material of limestone or granulated blast furnace slag having a particle size of 30 to 60 μm is added in an amount of not more than 5% by mass of the cement.
According to some embodiments of the invention, the rice hull ash is ash obtained by burning rice hulls and the chemical composition comprises SiO2、Al2O3、K2O, NaO, CaO and unburned carbon, SiO2The content of (1) is 80-95%, the particle size is 0.05-0.30 μm, and the specific surface area is not less than 400 square meters per k Ag.
According to some embodiments of the invention, the bauxite is bauxite with a particle size of 0.16-1.25 mm
According to some embodiments of the invention, the glass frit has a particle size of 1-13 um; the apparent surface value is 2700kg/m3(ii) a A glass frit having a mohs hardness of 7.8.
According to some embodiments of the invention, the polypropylene fibers have a length of 20 mm; the diameter is 0.13 mm; the tensile strength is more than or equal to 1000 MPa; elongation at break of 15%; the mixing amount of the polypropylene fiber with alkali resistance of 100 percent is 0.07 percent.
According to some specific embodiments of the invention, the self-repairing fiber reinforced ultrahigh-performance concrete is coated on the outer side of the reinforcement cage to form a self-repairing fiber reinforced ultrahigh-performance concrete layer, and the thickness of the self-repairing fiber reinforced ultrahigh-performance concrete layer is 7-10 mm; the steel reinforcement cage is as main muscle, ordinary hot rolling ribbed steel bar as supplementary muscle, high-strength cold wire drawing by the prestressed wire and makes the stirrup, and two high-strength cold wire drawing alternately are rhombus and encircle the ligature of main muscle, and are less than or equal to 50mm apart from the high-strength cold wire drawing interval that both ends are less than 150cm department, and are greater than or equal to 70mm apart from both ends high-strength cold wire drawing interval that 150cm department.
According to some specific embodiments of the present invention, the self-healing fiber reinforced ultra-high performance concrete pole has an outer diameter that gradually increases in a top-to-bottom direction;
when the length of the self-repairing fiber reinforced ultrahigh-performance concrete pole is less than or equal to 10m, and the outer diameter of the upper end of the self-repairing fiber reinforced ultrahigh-performance concrete pole is less than or equal to 190mm, the wall thickness of the self-repairing fiber reinforced ultrahigh-performance concrete pole is less than or equal to 20 mm;
when the length of the self-repairing fiber reinforced ultrahigh-performance concrete electric pole is more than or equal to 12m and the outer diameter of the upper end of the self-repairing fiber reinforced ultrahigh-performance concrete electric pole is more than or equal to 190mm, the wall thickness of the self-repairing fiber reinforced ultrahigh-performance concrete electric pole is 30-50 mm.
According to the embodiment of the two aspects of the invention, the processing method of the self-repairing fiber reinforced ultrahigh-performance concrete pole comprises the following steps:
s1, prefabricating an electric pole mould of the high-strength reinforcement cage, and weighing the components according to the proportion;
s2, selecting weighed bauxite and polypropylene fiber, and stirring for 2 minutes;
s3, adding portland cement, rice hull ash and glass powder and stirring for 3 minutes;
s4, adding a carboxylic acid water reducing agent, weighing 60% of the total water, adding the water reducing agent into the mixture, and stirring for 2 minutes;
s5, adding the rest 40% of water, stirring for 3 minutes to prepare the ultrahigh-performance active powder concrete, pouring the ultrahigh-performance active powder concrete into a pole mould provided with a prefabricated high-strength reinforcement cage, applying prestress tension, compacting the concrete under the action of centrifugal force by rotating the mould at a high speed, curing the concrete in a steam pool with the mould at 100 ℃ for 8 hours, and performing pressure steam curing in a still kettle at 2Mpa to obtain the self-repairing fiber reinforced ultrahigh-performance concrete pole.
Compared with the prior art, the self-repairing fiber reinforced ultrahigh-performance concrete electric pole obtained by the preparation method of the self-repairing fiber reinforced ultrahigh-performance concrete electric pole provided by the embodiment of the invention
The self-repairing fiber reinforced ultrahigh-performance concrete pole is characterized in that a carrier for wrapping a repairing agent is added into concrete, when the concrete cracks, an outer-layer wrapping object of the repairing agent is broken, the repairing agent flows out to fill the cracks, finally the cracks are sealed, a substance capable of blocking the cracks is added into the concrete, the substance is activated when meeting water, crystals are generated and deposited on the surfaces of the cracks, the crystals are continuously added to precipitate around the cracks, and the cracked parts of the concrete are gradually filled compactly.
The self-repairing fiber reinforced ultra-high performance concrete pole is made of inorganic materials, is green and environment-friendly, reduces national building emission to be traditional concrete, has about half of CO2 emission compared with the production process of equivalent cement, has the use amount of non-renewable natural resource aggregate in the production process, is made of cement, rice hull ash, bauxite, glass powder, high-strength fibers, repairing glue fibers and the like, is prepared by specific processes such as high-temperature heat sealing and the like through optimized grading design, and is a high-technology composite material combining ultra-fine particle dense materials, fiber reinforcement and self-repairing capability technologies. Has the characteristics of ultrahigh strength, high toughness, high durability, high volume stability, self-repairing property and the like. The benefits provided by self-healing fiber reinforced ultra-high performance concrete poles are apparent.
The repair glue fiber is a typical brittle material, and has no yield extension stage, so long as the crack penetrates through the glass fiber, the glass fiber is immediately broken; chemical adhesion of the concrete to the contact surface of the repair cement fiber tube; the concrete is hardened and the glass fiber is tightly wrapped by the friction force. Repairing the expansion coefficient of the glue fiber: linear expansion coefficient of 1X 10-5 concrete: (1.0-1.4)1 x 10-5 can be stored in concrete for a long time, the strength is not changed, and the performance of the concrete is not influenced; can store various repairing cements for a long time without chemical reaction. The repair of the glue solution core fiber is a critical link for improving the durability of the concrete material, and the control and repair of the crack of the self-repair fiber reinforced ultrahigh-performance concrete pole are important links. The diameter of the repair glue solution core fiber is 0.5mm, the wall thickness is 0.2mm, the length is 40mm, polyurethane and acrylic ester are injected into the repair agent and are mixed in concrete, the repair glue solution core fiber with the physical triggering function sensitive to external stress is doped into concrete composition of the crack self-repair concrete pole based on the repair glue solution core fiber, an intelligent crack self-repair system is formed inside the crack self-repair concrete pole, the repair glue solution core fiber is uniformly distributed in the concrete of the pole through a typical concrete production process of the pole, and the repair glue solution core fiber material cannot be broken in the mixing and curing process. When the concrete pole is used, once a crack generates stress, the repairing glue core fiber is triggered to crack, the repairing agent is released, the crack is filled, and the purpose of repairing the crack is achieved. On the contrary, when the internal environment of the concrete pole is stable, namely no crack is generated, the repairing glue core fiber implanted into the concrete pole can stably exist in the matrix for a long time. The strength and the ductility of the self-repaired concrete are improved. The preparation process of the used repairing glue core fiber is simple to operate and easy to realize, and provides conditions for industrial mass production.
Early strength portland cement is adopted, and the type is as follows: adding limestone with the mass not more than 5% of the cement or a mixed material with the grain size of granulated blast furnace slag of 30-60 mu m into the P.II 52.5R;
main characteristic table of early strength portland cement
The rice hull ash is obtained by burning rice hull and has chemical component of SiO2The content is about 80-95%, and the particle size is 0.05-0.30 μm. The pozzolanic admixture with high pozzolanic activity and huge specific surface area is obtained by controlling and incinerating the rice hulls at low temperature. Nano-scale SiO of its microstructure2Gelling particles and a large amount of nano-scale pores to obtain high pozzolanic activity and a large specific surface area. The rice hull ash is applied to the ultra-high performance concrete, and due to the micro-filling effect of the rice hull ash, the ultra-fine pore structure and the internal curing effect of pore water, the pore structure of the concrete can be improved, and high strength, high durability and low shrinkage are obtained. When the rice husk ash is mixed into concrete, the rice husk ash is contacted with water, and a part of small particles are quickly decomposed, and the solution is rich in Si02The Ca-poor gel forms an adhesion layer on the surface of the rice hull ash particles, and after a certain time, the Si-rich 02And Ca (oh) produced by the Ca-poor gel adhesion layer starting to dissolve and cement hydration: the reaction produced C-S-H gel. The rice husk ash can be doped into concrete to change some important physical performance indexes of the concrete, the rice husk ash particles can fill relatively large pores of cement particles to reduce the volume of the pores, and the rice husk ash can be added to improve the cohesiveness and reduce the bleeding amount of the concrete. Because the specific surface area of the rice husk ash is very large, a lot of free water in the concrete is restrained by the rice husk ash particles, and the bleeding amount can be greatly reduced. Thereby reducing the accumulation of interfacial moisture and improving the interfacial adhesion performance. When the slump is large and the centrifugation time is long, the rice husk ash concrete is not easy to separate.
Chemical composition table of rice husk ash
The water for mixing concrete with water can be classified into drinking water, surface water, ground water, seawater, and industrial wastewater after appropriate treatment or disposal according to water source.
Material content limit table for concrete mixing water
The polycarboxylate superplasticizer is a high-performance water reducing agent with the concentration of 0.6 +/-0.1 g/cm3(bulk density), pH 4.4 + -0.5, chloride ion content less than or equal to 0.1%, and alkali content less than or equal to 1.0%. The influence of the addition of the polycarboxylic acid water reducing agent on the hydration heat of the concrete. As the polycarboxylate water reducing agent coats the cement particles through adsorption, the normal hydration reaction speed of cement substances is damaged, and the cement particles are relatively concentrated and quickly subjected to hydration reaction and dispersed in concrete, so that the hydration heat release period is prolonged, and the hydration heat peak value is reduced. The slump loss and the retardation. Because the polycarboxylate superplasticizer prolongs the hydration reaction time, concrete cement components can not be subjected to complete hydration reaction in a short period of time, and the concreteThe quantity of the gelling components is small, the viscosity of the concrete is slowly increased, the water consumption of hydration reaction is reduced, the loss of free water in the concrete is slowed down, the loss of concrete slump is reduced, and the delayed coagulation of the concrete is well improved. The effect on early strength. When the hydration reaches the requirements of concrete retardation, slump and the like, the adsorption effect is reduced, the concrete hydration enters a relatively high peak period to generate a large amount of heat, so that various hydration products are increased, gaps of the concrete are filled, the compactness of the concrete is increased, and a certain early strength is formed. Influence on the later strength of the concrete. Because the late stage hydration action is gradually slowed down, the heat generation and the quantity of the hydration are also slowed down, and the hydrated characteristics occupy a large space, so that the unreacted cement components and water are difficult to act, and partial unhydrated substances exist in the concrete, which are the substances forming the later stage strength reserve of the concrete. Influence on the cement dosage. In the concrete mixture, the components of the water reducing agent effectively enable the cement components to be further uniformly diffused, and the action of hydration heat is effectively controlled, so that the water consumption is reduced, the action of cement substances in the concrete after hydration is effectively improved, the cement component gelation loss caused by excessive construction water is reduced, and the purpose of reducing the cement consumption is achieved. The mechanism of the concrete impermeability. The concrete hydration heat expansion is effectively controlled due to the fact that the polycarboxylate water reducing agent slows down the hydration effect of the concrete, the thermal expansion of materials is limited, the shrinkage after the water-fat effect of the concrete is reduced, the generation of structure shrinkage is effectively avoided, meanwhile, the hydrate forms the filling effect of gel, so that the concrete sun gaps are reduced, the compactness is improved, and thirdly, due to the reduction of construction water, the free water storage in the concrete is reduced, the water gaps in the concrete after the free water is evaporated are correspondingly reduced, and therefore the concrete anti-permeability effect is achieved.
Concrete performance index of polycarboxylic acid high-performance water reducing agent
Bauxite with the particle size of bauxite being 0.16-1.25 mm; glassThe particle size of the powder is 1-13 um; the apparent surface value is 2700KG/m3The Mohs hardness is 7.8;
the length of the polypropylene fiber is 20 mm; the diameter is 0.13mm, the tensile strength is more than or equal to 1000Mpa, the elongation at break is 15 percent, and the alkali resistance is 100 percent; the fiber reinforced ultra-high performance concrete is the foundation of an electric pole structure, and the concrete can deform in different practical environments in the process of setting and hardening. The concrete material of the invention, namely cement, rice hull ash, bauxite, glass powder and other composite materials, can improve the concrete strength by hydration hardening so as to ensure that the concrete has better mechanical properties, and in the embodiment, the concrete has the advantages of compressive strength not lower than 150Mpa, higher strength, higher rigidity, impermeability and weather resistance, but high brittleness and easy cracking. The concrete with polypropylene fiber can prevent the cracks, which are caused by plastic shrinkage and cracks due to surface dehydration during the setting and hardening process of the concrete. The polypropylene fiber has lower elastic modulus than that of hardened concrete, so that the toughness of the hardened concrete is improved to a certain extent. Compared with steel fiber, the steel fiber is not rusted and corroded; people are not pricked; easy dispersion;
the concrete protective layer of the high-strength steel wire reinforcement cage is 7-10 mm; the steel reinforcement cage is characterized in that prestressed steel wires are used as main reinforcements, common hot-rolled ribbed steel bars are used as auxiliary reinforcements, and high-strength cold-drawn wires are used as stirrups, the two high-strength cold-drawn wires are crossed and bound around the main reinforcements in a rhombic shape, the distance between the high-strength cold-drawn wires at the positions 150cm away from the two ends is less than or equal to 50mm, and the distance between the high-strength cold-drawn wires at the positions 150cm away from the two; the diameter of the self-repairing fiber reinforced ultrahigh-performance concrete pole is less than or equal to 190mm, the length of the pole is less than or equal to 10m, and the wall thickness of the pole is less than or equal to 20 mm; the wall thickness is 30 mm-50 mm with the minor diameter more than or equal to 190mm and the length more than or equal to 12 m.
A self-healing fiber reinforced ultra-high performance concrete pole according to an embodiment of the present invention is described below with reference to specific embodiments.
The self-repairing fiber reinforced ultrahigh-performance concrete pole consists of self-repairing fiber reinforced ultrahigh-performance concrete and a reinforcement cage bound by high-strength steel wires; the self-repairing fiber reinforced ultrahigh-performance concrete is prepared from the following raw materials in parts by mass:
40-60 parts of compound glue core fiber;
950 to 1000 portions of Portland cement;
160-170 parts of rice hull ash;
900 to 1200 parts of vanadium soil;
70-90 parts of glass powder;
50-70 parts of polypropylene fiber;
145-170 parts of water;
40-60 parts of a carboxylic acid water reducing agent.
The specific mixture ratio is as follows:
concrete poles are the most widely used line equipment in line construction. But it is a brittle material and is prone to cracking during construction or use. In order to improve the strength and the safety of the self-repairing fiber reinforced ultrahigh-performance concrete pole provided by the embodiment of the invention, the self-repairing fiber reinforced ultrahigh-performance concrete in the self-repairing fiber reinforced ultrahigh-performance concrete pole is mixed with the repairing glue liquid core fiber. As a preferred embodiment, the self-repairing fiber reinforced ultrahigh-performance concrete is composed of cement, rice hull ash, bauxite, glass powder, high-strength fibers, repairing glue fibers and the like. The weighed bauxite and the polypropylene fiber are stirred for 2 minutes → cement, rice hull ash and glass powder are put in for 3 minutes → water reducing agent is put in for 60 percent of water → stirring for 2 minutes → the rest 40 percent of water is added in for 3 minutes; after the ultrahigh-performance active powder concrete is prepared, pouring the ultrahigh-performance active powder concrete into an electric pole mould provided with a prefabricated high-strength reinforcement cage to apply prestress tensioning, compacting the concrete under the action of centrifugal force by rotating the mould at a high speed, curing for 8 hours in a steam pool at 100 ℃ with the mould, and performing pressure steam curing in a steam pressure kettle at 2Mpa to obtain the self-repairing fiber reinforced ultrahigh-performance concrete electric pole.
Examples
The self-repairing fiber reinforced ultra-high performance concrete pole comprises the following formula components in parts by weight: 975 parts of Portland cement;
example 1-1: z-190 × 12 × M × BY, the parameter table is as follows:
the sectional area of the main reinforcement (prestressed steel wire) is 905mm2(ii) a Gel material: 975 parts of Portland cement, 165 parts of rice hull ash and 80 parts of glass powder; aggregate: 1055 parts of bauxite; additive: 43.8 parts of a polycarboxylic acid water reducing agent; reinforcing materials: 54 parts of polypropylene fiber; self-repairing material: repairing glue core fiber 50 parts;
the preparation method of the self-repairing fiber reinforced ultrahigh-performance concrete pole comprises the following steps:
weighing the components according to the formula of the self-repairing fiber reinforced ultrahigh-performance concrete pole;
bauxite and polypropylene fiber → stirring for 2 minutes → cement, rice hull ash and glass powder → stirring for 3 minutes → water reducing agent is added for 60 percent of water → stirring for 2 minutes → the residual 40 percent of water is added for stirring for 3 minutes; after the ultrahigh-performance active powder concrete is prepared, pouring the ultrahigh-performance active powder concrete into an electric pole mould provided with a prefabricated high-strength reinforcement cage, applying prestress tensioning, compacting the concrete under the action of centrifugal force by rotating the mould at a high speed, curing for 8 hours in a steam pool at 100 ℃ with the mould, and then performing pressure steam curing in a still kettle at the pressure of 2 Mpa.
Examples 1 to 2: z-190 × 12 × M × BY, the parameter table is as follows:
the sectional area of the main reinforcement (prestressed steel wire) is not less than 905mm 2; gel material: 995 parts of Portland cement, 165 parts of rice hull ash and 70 parts of glass powder; aggregate: 1070 parts of bauxite; additive: 50 parts of a polycarboxylic acid water reducing agent; reinforcing materials: 63 parts of polypropylene fiber; self-repairing material: repairing glue core fiber 50 parts;
the preparation method of the self-repairing fiber reinforced ultrahigh-performance concrete pole comprises the following steps:
weighing the components according to the formula of the self-repairing fiber reinforced ultrahigh-performance concrete pole;
bauxite and polypropylene fiber → stirring for 2 minutes → cement, rice hull ash and glass powder → stirring for 3 minutes → water reducing agent is added for 60 percent of water → stirring for 2 minutes → the residual 40 percent of water is added for stirring for 3 minutes; after the ultrahigh-performance active powder concrete is prepared, pouring the ultrahigh-performance active powder concrete into an electric pole mould provided with a prefabricated high-strength reinforcement cage, applying prestress tensioning, compacting the concrete under the action of centrifugal force by rotating the mould at a high speed, curing for 8 hours in a steam pool at 100 ℃ with the mould, and then performing pressure steam curing in a still kettle at the pressure of 2 Mpa.
Mechanical Property test
The self-repairing fiber reinforced ultra-high performance concrete poles prepared in the above examples 1-2 were subjected to performance tests, and the test results are shown in table 1:
TABLE 1
Comparison of mechanical Properties
The mechanical property comparison test results of the self-repairing fiber reinforced ultrahigh-performance concrete pole, the general ultrahigh-strength concrete pole and the common high-strength concrete pole which are prepared according to the mixing proportion are shown in table 2:
TABLE 2
From table 2, it can be seen that the self-repairing fiber reinforced ultra-high performance concrete pole prepared according to the technology realizes that the self-repairing performance of the concrete pole can be remarkably improved on the basis of ensuring the mechanical properties (namely the strength grade, plasticity, pole crack resistance coefficient, deflection and the like) and high durability, high reliability, high workability, high volume stability and economy which the self-repairing fiber reinforced ultra-high performance concrete pole should have, avoids the defects that the concrete pole is easy to cause congenital microcracks and the like in the concrete during hoisting, carrying and construction, can bring remarkable economic benefit and construction quality improvement effect, and has high engineering application value and wide market prospect.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A self-repairing fiber reinforced ultra-high performance concrete pole is characterized in that: the self-repairing fiber reinforced ultrahigh-performance concrete pole comprises a steel reinforcement cage, self-repairing fiber reinforced ultrahigh-performance concrete is coated on the outer side of the steel reinforcement cage, and the self-repairing fiber reinforced ultrahigh-performance concrete is composed of the following raw materials in parts by mass:
40-60 parts of compound glue core fiber;
950 to 1000 portions of Portland cement;
160-170 parts of rice hull ash;
900 to 1200 parts of bauxite;
70-90 parts of glass powder;
50-70 parts of polypropylene fiber;
145-170 parts of water;
40-60 parts of a carboxylic acid water reducing agent.
2. The self-healing fiber reinforced ultra-high performance concrete pole of claim 1, wherein: the diameter of the repair glue core fiber is 0.5mm, the wall thickness is 0.2mm, the length is 40mm, polyurethane and acrylic ester are injected to serve as a repair agent, and the doping amount of the repair agent is 0.02%.
3. The self-healing fiber reinforced ultra-high performance concrete pole of claim 1, wherein: the Portland cement is P & II 52.5R type early strength cement, a mixed material which is not more than 5% of the mass of the cement is added, the mixed material is a mixture of limestone or granulated blast furnace slag, and the particle size of the limestone and the granulated blast furnace slag is 30-60 mu m.
4. The self-healing fiber reinforced ultra-high performance concrete pole of claim 1, wherein: the rice hull ash is obtained by burning rice hulls, and the chemical components of the rice hull ash comprise SiO2、Al2O3、K2O, NaO, CaO and unburned carbon, SiO2The content of (1) is 80-95%, the particle size is 0.05-0.30 μm, and the specific surface area is not less than 400 square meters per k Ag.
5. The self-healing fiber reinforced ultra-high performance concrete pole of claim 1, wherein: the bauxite is bauxite with the particle size of 0.16-1.25 mm.
6. The self-healing fiber reinforced ultra-high performance concrete pole of claim 1, wherein: the particle size of the glass powder is 1-13 um; the apparent surface value is 2700kg/m3(ii) a A glass frit having a mohs hardness of 7.8.
7. The self-healing fiber reinforced ultra-high performance concrete pole of claim 1, wherein: the length of the polypropylene fiber is 20 mm; the diameter is 0.13 mm; the tensile strength is more than or equal to 1000 MPa; elongation at break of 15%; the mixing amount of the polypropylene fiber with alkali resistance of 100 percent is 0.07 percent.
8. The self-healing fiber reinforced ultra-high performance concrete pole of claim 1, wherein: the self-repairing fiber reinforced ultrahigh-performance concrete is coated on the outer side of the reinforcement cage to form a self-repairing fiber reinforced ultrahigh-performance concrete layer, and the thickness of the self-repairing fiber reinforced ultrahigh-performance concrete layer is 7-10 mm; the steel reinforcement cage is as main muscle, ordinary hot rolling ribbed steel bar as supplementary muscle, high-strength cold wire drawing by the prestressed wire and makes the stirrup, and two high-strength cold wire drawing alternately are rhombus and encircle the ligature of main muscle, and are less than or equal to 50mm apart from the high-strength cold wire drawing interval that both ends are less than 150cm department, and are greater than or equal to 70mm apart from both ends high-strength cold wire drawing interval that 150cm department.
9. The self-healing fiber reinforced ultra-high performance concrete pole of claim 1, wherein: the outer diameter of the self-repairing fiber reinforced ultra-high performance concrete pole is gradually increased in the direction from top to bottom;
when the length of the self-repairing fiber reinforced ultrahigh-performance concrete pole is less than or equal to 10m, and the outer diameter of the upper end of the self-repairing fiber reinforced ultrahigh-performance concrete pole is less than or equal to 190mm, the wall thickness of the self-repairing fiber reinforced ultrahigh-performance concrete pole is less than or equal to 20 mm;
when the length of the self-repairing fiber reinforced ultrahigh-performance concrete electric pole is more than or equal to 12m and the outer diameter of the upper end of the self-repairing fiber reinforced ultrahigh-performance concrete electric pole is more than or equal to 190mm, the wall thickness of the self-repairing fiber reinforced ultrahigh-performance concrete electric pole is 30-50 mm.
10. The method for processing the self-repairing fiber reinforced ultra-high performance concrete electric pole as recited in any one of claims 1 to 0, wherein: the method comprises the following steps:
s1, prefabricating an electric pole mould of the high-strength reinforcement cage, and weighing the components according to the proportion;
s2, selecting weighed bauxite and polypropylene fiber, and stirring for 2 minutes;
s3, adding portland cement, rice hull ash and glass powder and stirring for 3 minutes;
s4, adding a carboxylic acid water reducing agent, weighing 60% of the total water, adding the water reducing agent into the mixture, and stirring for 2 minutes;
s5, adding the rest 40% of water, stirring for 3 minutes to prepare the ultrahigh-performance active powder concrete, pouring the ultrahigh-performance active powder concrete into a pole mould provided with a prefabricated high-strength reinforcement cage, applying prestress tension, compacting the concrete under the action of centrifugal force by rotating the mould at a high speed, curing the concrete in a steam pool with the mould at 100 ℃ for 8 hours, and performing pressure steam curing in a still kettle at 2Mpa to obtain the self-repairing fiber reinforced ultrahigh-performance concrete pole.
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