CN113105188A - Electric pole reinforcing method based on fiber grid reinforced UHPC - Google Patents
Electric pole reinforcing method based on fiber grid reinforced UHPC 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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- E—FIXED CONSTRUCTIONS
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- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
- C04B2111/723—Repairing reinforced concrete
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
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Abstract
The invention discloses an electric pole reinforcing method based on fiber grid reinforced UHPC, which adopts the fiber grid reinforced UHPC to fill up the damaged part of the electric pole; coating an interface agent on the corresponding area of the damaged part on the filled electric pole wall; coating a fiber grid reinforced UHPC layer on the interface agent, and pasting a fiber grid layer on the fiber grid reinforced UHPC layer; repeatedly coating a next fiber grid reinforced UHPC layer outside the fiber grid layer, and attaching a next fiber grid layer on the next fiber grid reinforced UHPC layer until the number of the fiber grid reinforced UHPC layers reaches a preset number; according to the invention, after the damaged part of the electric pole is filled with the fiber mesh reinforced UHPC, the compressive bearing capacity, the bending bearing capacity and the shearing bearing capacity of the electric pole can be increased, and the compressive strength of the electric pole can be further increased and the durability of the electric pole can be increased by the external fiber mesh reinforced UHPC layer and the fiber mesh layer.
Description
Technical Field
The invention belongs to the technical field of electric pole reinforcement, and particularly relates to an electric pole reinforcement method based on fiber grid reinforced UHPC.
Background
In recent years, with the rapid development of urbanization and urban groups in China, the use scenes of electric poles are increasing day by day. As the service life of the electric pole becomes longer, it is easy to age or seriously break, which endangers the power supply and the daily life of residents, and the repair and reinforcement of the electric pole become increasingly important. Along with the development of urbanization, street, house around the pole are constantly renovated, and the pole receives the effect of accidental load for a long time, like vibrations, striking etc. and the pole receives the erosion of rainwater for a long time simultaneously, has appeared that the wall is damaged, the concrete protective layer drops, serious problems such as inside reinforcing bar corrosion and fracture warp. Once the pole suffers destruction, can influence the normal use of electric power in a large scale, can influence the safety of resident, livestock on every side more.
At present, the repair of the electric pole mainly adopts a reinforcing method of sticking fiber cloth. However, the pole is always in outdoor environment and is easily affected by rainwater, sunlight and day and night temperature difference, so that the adhered fiber cloth is easy to fall off, and the reinforcement is completely ineffective.
Disclosure of Invention
The invention aims to provide a pole reinforcing method based on fiber mesh reinforced UHPC (ultra high performance concrete) so as to improve the stress performance of a repaired pole.
The invention adopts the following technical scheme: a pole reinforcing method based on fiber mesh reinforced UHPC comprises the following steps:
filling up the damaged part of the electric pole by adopting fiber mesh reinforced UHPC;
coating an interface agent on the corresponding area of the damaged part on the filled electric pole wall;
coating a fiber grid reinforced UHPC layer with the thickness of 2-7 mm on the interface agent, and pasting a fiber grid layer on the fiber grid reinforced UHPC layer;
repeatedly coating a next fiber grid reinforced UHPC layer outside the fiber grid layer, and attaching a next fiber grid layer on the next fiber grid reinforced UHPC layer until the number of the fiber grid reinforced UHPC layers reaches a preset number; the thickness of the fiber grid reinforced UHPC layer from the second fiber grid reinforced UHPC layer on the inner side to the fiber grid reinforced UHPC layer on the outermost side is increased in sequence, and the thickness of the fiber grid reinforced UHPC layer on the outermost side is 4-6 mm.
Further, the fiber mesh layer is at least one of a carbon fiber mesh layer, an aramid fiber mesh layer, an alkali-resistant glass fiber mesh layer, a basalt fiber mesh layer, a polyvinyl alcohol fiber mesh layer and a polyamide fiber mesh layer, and the fiber mesh layer is prepared by bidirectional weaving, hybrid weaving or mesh hybrid sticking.
Furthermore, when the fiber mesh reinforced UHPC layer is coated, the whole circumference of the damaged part of the electric pole wall is coated.
Further, after the number of the fiber grid reinforced UHPC layers reaches a preset number, waterproof treatment and anticorrosion treatment are sequentially carried out.
Further, the predetermined number of layers is 3 to 6.
Further, the distance between the edge of the fiber mesh reinforced UHPC layer in the length direction of the electric pole and the edge of the damaged part in the length direction of the electric pole is more than or equal to 30 cm.
Further, the fiber mesh layer forms a closed loop along the circumference direction of the electric pole, and the overlapping length is more than or equal to 30 cm.
Further, the fiber grid reinforced UHPC is composed of cement, silica fume, mineral powder, polymer, nano modified high-modulus polyethylene crude fiber, fine sand, water and a water reducing agent;
the cement accounts for 22-29% of the total mass of the fiber grid reinforced UHPC;
the silica fume accounts for 15-18% of the total mass of the cement;
the mineral powder accounts for 22-63% of the total mass of the cement;
the polymer accounts for 1.5-2.0% of the total mass of the fiber grid reinforced UHPC;
the length of the nano modified high-modulus polyethylene crude fiber is 7-16 mm, the diameter is 0.10-0.18 mm, the elastic modulus is 101-150 GPa, the tensile strength is 2480-2940 MPa, and the volume mixing amount is 0.7-2.5%;
the fine sand accounts for 40-50% of the total mass of the fiber grid reinforced UHPC;
the water reducing agent accounts for 1.7-2.0% of the total mass of the cement;
the balance being water.
Further, the fiber grid reinforced UHPC is composed of cement, silica fume, mineral powder, polymer, nano modified high-modulus polyethylene crude fiber, nano modified high-modulus polyvinyl alcohol crude fiber, fine sand, water and a water reducing agent;
the cement accounts for 22-29% of the total mass of the fiber grid reinforced UHPC;
the silica fume accounts for 15-18% of the total mass of the cement;
the mineral powder accounts for 22-63% of the total mass of the cement;
the polymer accounts for 1.5-2.0% of the total mass of the fiber grid reinforced UHPC;
the length of the nano modified high-modulus polyethylene crude fiber is 7-16 mm, the diameter is 0.10-0.18 mm, the elastic modulus is 101-150 GPa, the tensile strength is 2480-2940 MPa, and the volume mixing amount is 0.7-2.5%;
the length of the nano modified high-modulus polyvinyl alcohol crude fiber is 7-20 mm, the diameter of the nano modified high-modulus polyvinyl alcohol crude fiber is 0.10-0.28 mm, the elastic modulus of the nano modified high-modulus polyvinyl alcohol crude fiber is 54-60 GPa, the tensile strength of the nano modified high-modulus polyvinyl alcohol crude fiber is 1450-1960 MPa, and the volume mixing amount of the nano modified high-modulus polyvinyl alcohol crude fiber is 0.7.
The fine sand accounts for 40-50% of the total mass of the fiber grid reinforced UHPC;
the water reducing agent accounts for 1.7-2.0% of the total mass of the cement;
the balance being water.
Further, the polymer is a water-soluble epoxy resin.
The invention has the beneficial effects that: according to the invention, after the damaged part of the electric pole is filled with the fiber mesh reinforced UHPC, the compressive bearing capacity, the bending bearing capacity and the shearing bearing capacity of the electric pole can be increased, and the compressive strength of the electric pole can be further increased and the durability of the electric pole can be increased by the external fiber mesh reinforced UHPC layer and the fiber mesh layer.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The invention discloses a fiber grid reinforced UHPC-based electric pole reinforcing method, belongs to the technical field of fiber grid reinforced cement-based composite material reinforcing, and is mainly used for quickly repairing and reinforcing an electric pole.
The fiber mesh reinforced ultra-high performance concrete (UHPC) reinforced electric pole has remarkable advantages. The fiber mesh has the remarkable advantages of corrosion resistance, light weight, high strength, high durability, convenience in reinforcing construction and the like, and the strength of the fiber mesh is 5-10 times that of a common reinforcing steel bar. The UHPC permeates among the fiber yarns of the fiber grids, and the UHPC is embedded into the holes of the fiber grids to form a stressed whole and can bear load in multiple directions. The thickness of the UHPC is 10-15 mm, and the UHPC has almost no influence on the original structure size. The fiber grid reinforcement has the double functions of durability repair and mechanical property enhancement, and the stress performance of the electric pole is obviously improved while the impermeability and the corrosion resistance are improved and the durability is improved.
Specifically, the electric pole reinforcing method based on the fiber grid reinforced UHPC comprises the following steps: filling up the damaged part of the electric pole by adopting fiber mesh reinforced UHPC; coating an interface agent on the corresponding area of the damaged part on the filled electric pole wall; coating a fiber grid reinforced UHPC layer with the thickness of 2-7 mm on the interface agent, and pasting a fiber grid layer on the fiber grid reinforced UHPC layer; repeatedly coating a next fiber grid reinforced UHPC layer outside the fiber grid layer, and attaching a next fiber grid layer on the next fiber grid reinforced UHPC layer until the number of the fiber grid reinforced UHPC layers reaches a preset number; the thickness of the fiber grid reinforced UHPC layer from the second fiber grid reinforced UHPC layer on the inner side to the fiber grid reinforced UHPC layer on the outermost side is increased in sequence, and the thickness of the fiber grid reinforced UHPC layer on the outermost side is 4-6 mm.
Repairing pretreatment such as filling, plugging and the like is carried out on the cracks on the surface of the electric pole by using UHPC, and surface cleaning, surface agent coating pretreatment and the like are carried out on the wall of the electric pole; for the local damage and the good structure, UHPC is adopted for filling; for the severely damaged electric pole, filling the hole with UHPC, and then reinforcing the UHPC by using a fiber grid to perform structural full-perimeter reinforcement, waterproof treatment and anticorrosion treatment on the wall of the electric pole; and for the electric pole with serious structural damage, reinforcing and repairing by adopting 3-6 layers of fiber grids UHPC.
According to the invention, after the damaged part of the electric pole is filled with the fiber mesh reinforced UHPC, the compressive bearing capacity, the bending bearing capacity and the shearing bearing capacity of the electric pole can be increased, and the compressive strength of the electric pole can be further increased and the durability of the electric pole can be increased by the external fiber mesh reinforced UHPC layer and the fiber mesh layer.
Specifically, the interface agent can be coated once or twice according to actual needs. And a second fiber grid reinforced UHPC layer from the inner side, wherein the thickness of the layer can be selected to be 2-3 mm.
In the embodiment of the invention, the fiber mesh layer is at least one of a carbon fiber mesh layer, an aramid fiber mesh layer, an alkali-resistant glass fiber mesh layer, a basalt fiber mesh layer, a polyvinyl alcohol fiber mesh layer and a polyamide fiber mesh layer, and the fiber mesh layer is prepared by bidirectional weaving, hybrid weaving or mesh hybrid pasting.
In one embodiment of the invention, when the fiber grid reinforced UHPC layer is coated, the whole circumference of the damaged part of the pole wall is coated, so that the integrity of the reinforced part and the original pole part can be increased.
In the embodiment of the invention, after the number of the fiber grid reinforced UHPC layers reaches the preset number, the water-proof treatment and the corrosion-proof treatment are sequentially carried out, so that the strength and the water-proof and corrosion-proof degree of the reinforced electric pole are further enhanced.
In the embodiment of the invention, the predetermined number of layers is 3-6, and can be specifically selected according to actual needs. In order to increase the integrity of the repaired electric pole, the distance between the edge of the fiber mesh reinforced UHPC layer in the length direction of the electric pole and the edge of the damaged part in the length direction of the electric pole is more than or equal to 30cm, the fiber mesh layer forms a closed loop in the circumference direction of the electric pole, and the lap joint length is more than or equal to 30 cm.
In one embodiment of the invention, the fiber mesh reinforced UHPC is composed of cement, silica fume, mineral powder, polymer, nano modified high modulus polyethylene coarse fiber, fine sand, water and water reducing agent; the cement accounts for 22-29% of the total mass of the fiber grid reinforced UHPC; the silica fume accounts for 15-18% of the total mass of the cement; the mineral powder accounts for 22-63% of the total mass of the cement; the polymer accounts for 1.5-2.0% of the total mass of the fiber grid reinforced UHPC; the length of the nano modified high-modulus polyethylene crude fiber is 7-16 mm, the diameter is 0.10-0.18 mm, the elastic modulus is 101-150 GPa, the tensile strength is 2480-2940 MPa, and the volume mixing amount is 0.7-2.5%; the fine sand accounts for 40-50% of the total mass of the fiber grid reinforced UHPC; the water reducing agent accounts for 1.7-2.0% of the total mass of the cement, and specifically, a polycarboxylic acid water reducing agent is used.
The cement is selected from high belite sulphoaluminate cement and portland cement, and accounts for 11-17% of the total mass of the UHPC; for the general engineering, Portland cement is adopted, and accounts for 5-10% of the total mass of the UHPC; more preferably, the cement is further selected from the group consisting of BS-HFR42.5, BS-HFR52.5, PII 42.5 and PII 52.5.
Specifically, the nanometer modified high-modulus polyethylene crude fiber can be mixed with polyvinyl alcohol crude fiber; the length of the high-modulus polyvinyl alcohol crude fiber is 7-20 mm, the diameter is 0.10-0.28 mm, the elastic modulus is 54-60 GPa, the tensile strength is 1450-1960 MPa, and the volume mixing amount is 0.7-1.5%. The ultrahigh-performance concrete prepared by using the nano modified high-modulus polyethylene crude fiber to replace steel fiber has good mechanical property and durability. When UHPC is doped with nano modified high-modulus polyethylene crude fiber with the volume percent of 0.5-1.2%, the fracture energy is 1.51 times that of steel fiber with the volume percent of 1.2%, and the cost is only 61% of that of the steel fiber. The surface of the nano modified fiber increases the interface bonding property of the fiber and the ultra-high performance concrete, and the interface bonding strength after modification is improved by 57 percent compared with that before modification.
When the nano modified high-modulus polyethylene crude fiber with the volume doping amount of 1.0 percent is mixed with the polyvinyl alcohol crude fiber with the volume doping amount of 1.0 percent, compared with the nano modified high-modulus polyethylene crude fiber with the single doping amount of 2.5 percent, the fracture energy and the breaking strength of the UHPC are respectively improved by 150 percent and 110 percent; compared with the polyvinyl alcohol crude fiber with the single doping volume of 2.6 percent, the fracture energy and the breaking strength of the UHPC are respectively improved by 170 percent and 98 percent, and the mixing effect is obvious.
The fine sand is selected from water washing river sand or quartz sand, the particle size is 10-80 meshes, and the water-cement ratio is 0.17-0.18.
Further, the polymer is a water-soluble epoxy resin. The water-soluble epoxy resin can improve the interface bonding property of the nano modified high-modulus polyethylene crude fiber and the ultra-high performance concrete and increase the deformation capacity of the ultra-high performance concrete, so that the UHPC has good mechanical property and toughness. When the dosage of the UHPC mixed with the water-soluble epoxy resin is 1.5-2.0% of the total mass, the fracture energy is 1.39 times that of the UHPC without mixing, and the tensile strength is 1.24 times that of the UHPC without mixing.
More specifically, the selected nano material is nano silicon dioxide (SiO)2) Particle size of 5-20 nm and specific surface area of 150-450 m2The/g, the dispersibility and the interface bonding strength of the nano modified fiber, and the mechanical properties such as tensile strength, elastic modulus and the like are improved. The fiber grid reinforced UHPC is adopted, and the 28d compressive strength of the fiber grid reinforced UHPC is 150-200 MPa after test.
In addition, the reinforcing material and the process can be used for reinforcing structures and buildings in corrosive environments such as aqueducts, sewage treatment pools, chemical plant buildings, ocean structures, ocean oil extraction platforms and the like; the difference with the reinforced pole is that the surface of the existing structure needs to be roughened, and the bonding performance of the reinforcing layer and the existing layer is increased.
The invention repairs rusty reinforcing steel bars and fills the original cracks, so that the crack resistance bearing capacity and the ultimate bearing capacity of the electric pole wall are respectively improved by 26 percent and 49 percent, and the initial crack deformation capacity and the ultimate deformation capacity of the electric pole wall are respectively improved by 35 percent and 74 percent. The reinforced concrete wall is repaired and reinforced, so that the compression bearing capacity is improved by 29-32%, the bending bearing capacity is improved by 44-91%, and the shear bearing capacity is improved by 21-69%. And repairing and reinforcing the reinforced concrete wall to prolong the corrosion resistance service life of the reinforced concrete wall in a humid environment by 26-38 years. The shear bonding strength of the UHPC and the original concrete is 2.4-5.8 MPa. The 24-hour compressive strength of the UHPC is 31-60 MPa, and the flexural strength is 5.2-7.4 MPa. The 28d compressive strength of the UHPC is 150-200 MPa, the breaking strength is 11.4-16.2 MPa, the bending toughness f0.5 is 3.9-4.9 MPa, f1.0 is 1.5-3.1 MPa, and T20 is 16.6-29.1 joules. The ultimate tensile strain of the UHPC is 3.9-4.1 times that of common concrete, and the fracture energy is improved by 2.9-4.3 times. The ultrahigh-performance concrete prepared by using the nano modified high-modulus polyethylene crude fiber to replace steel fiber has good mechanical property and durability. When UHPC is doped with nano modified high-modulus polyethylene crude fiber with the volume percent of 0.5-1.2%, the fracture energy is 1.51 times that of steel fiber with the volume percent of 1.2%, and the cost is only 61% of that of the steel fiber. The surface of the nano modified fiber increases the interface bonding property of the fiber and the ultra-high performance concrete, and the interface bonding strength after modification is improved by 57 percent compared with that before modification. When the volume mixing amount of the nano modified high-modulus polyethylene crude fiber is 1.0 percent and the volume mixing amount of the polyvinyl alcohol crude fiber is 1.0 percent, compared with the volume mixing amount of the single doped nano modified high-modulus polyethylene crude fiber being 2.5 percent, the fracture energy and the breaking strength of UHPC are respectively improved by 150 percent and 110 percent, compared with the single doped coarse polyvinyl alcohol fiber being 2.6 percent, the fracture energy and the breaking strength of UHPC are respectively improved by 170 percent and 98 percent, and the mixing effect is obvious. When the dosage of the UHPC mixed with the water-soluble epoxy resin is 1.5-2.0% of the total mass, the fracture energy is 1.39 times that of the UHPC without mixing, and the tensile strength is 1.24 times that of the UHPC without mixing. The reinforcing material and the process can be used for reinforcing structures and buildings in corrosive environments such as aqueducts, sewage treatment pools, chemical plant buildings, ocean structures, ocean oil extraction platforms and the like; the difference with the reinforced pole is that the surface of the existing structure needs to be roughened, and the bonding performance of the reinforcing layer and the existing layer is increased.
Example 1:
the local crack of the original pole wall is 0.5-2 cm. And reinforcing by using fiber mesh reinforced UHPC. The UHPC raw material is as follows: portland cement, silica fume, mineral powder, a polymer, nano modified high-modulus polyethylene crude fiber, fine sand, water and a water reducing agent. P.II 52.5 cement accounts for 27 percent of the total weight of the UHPC; the length of the nano modified high-modulus polyethylene coarse fiber is 12mm, the diameter is 0.18mm, the strength is 1700MPa, and the volume mixing amount is 2.0 percent; the water-cement ratio is 0.18; the usage amount of the silica fume accounts for 18 percent of the cement; the using amount of the mineral powder accounts for 64 percent of the cement; the sand accounts for 42 percent of the total mass of the UHPC, is quartz sand, and has a particle size of 10 meshes; the polycarboxylic acid water reducing agent accounts for 1.7% of the cement consumption.
The reinforcing process comprises the following steps: filling the crack with the UHPC, then smearing the UHPC with the thickness of 7mm on the wall of the electric pole within the length range of the crack, pasting a layer of bidirectional basalt fiber grid, wherein the pitch of the basalt fiber is 5mm, and the tensile force per linear meter of the fiber grid in the directions of 2 warps and wefts is 72 kN; smearing 2mm of UHPC, sticking a layer of basalt fiber grid (the size and the performance of the grid are the same as those of the first layer), and then smearing 3mm of UHPC; then a layer of bidirectional basalt fiber grid (the size and the performance of the grid are the same as those of the first layer and the second layer) is pasted, and then 6mm UHPC is smeared.
Example 2:
the original electric pole has the cracking of a protective layer, the corrosion of steel bars, the crack of concrete is 2-3 cm, and the local concrete protective layer falls off. And reinforcing by adopting alkali-resistant glass fiber mesh reinforced UHPC. The raw materials of UHPC are: portland cement, silica fume, mineral powder, a polymer, nano modified high-modulus polyethylene crude fiber, fine sand, water and a water reducing agent. The high belite sulphoaluminate cement accounts for 25 percent of the total weight of the UHPC; the silica fume accounts for 18 percent of the cement consumption; the mineral powder accounts for 63% of the cement; the polymer is water-soluble epoxy resin, and the using amount of the water-soluble epoxy resin is 1.5 percent of the total mass; the length of the nano modified high-modulus polyethylene coarse fiber is 10mm, the diameter is 0.15mm, the elastic modulus is 135GPa, the tensile strength is 2480MPa, and the volume mixing amount is 2.0 percent; the fine sand accounts for 45.8 percent of the total weight of the UHPC, the sand is quartz sand, and the particle size is 60 meshes; the water-cement ratio is 0.17; the polycarboxylic acid water reducing agent accounts for 1.8% of the cement consumption.
The reinforcing process comprises the following steps: firstly, processing a raw steel bar by using a rust remover, repairing cracks on the wall of an electric pole by using UHPC (ultra high performance concrete), then smearing UHPC with the thickness of 6mm on the whole circumference within the length range of the cracks, pasting a layer of bidirectional alkali-resistant glass fiber grids, wherein the hole pitch of the alkali-resistant glass fiber is 7mm, and the tensile force per linear meter of the fiber grids in the directions of longitude and latitude 2 is 112 kN; then, UHPC with the thickness of 3mm is smeared, and a layer of alkali-resistant glass fiber grid is pasted (the grid size and the performance are the same as those of the first layer); then, UHPC with the thickness of 4mm is smeared, a layer of bidirectional basalt fiber grids is pasted, the hole pitch of the grids is 5mm, the tension of each linear meter of the fiber grids in the warp and weft directions is 72kN, and then the UHPC with the thickness of 5mm is smeared; and then a layer of bidirectional carbon fiber grids is pasted, the hole pitch of the grids is 5mm, the tension of each linear meter of the fiber grids in the warp and weft directions is 172kN, and then UHPC with the thickness of 6mm is smeared.
After the electric pole is reinforced, tests show that the shearing resistance and the bending resistance of the electric pole are improved by 71%, 87%, 187.1% and 52% respectively.
Example 3:
the original sewage treatment tank has the defects of protective layer cracking, steel bar corrosion, concrete crack of 1-2 cm and partial concrete protective layer falling. And reinforcing by adopting alkali-resistant glass fiber mesh reinforced UHPC. The raw materials of UHPC are: portland cement, silica fume, mineral powder, a polymer, nano modified high-modulus polyethylene crude fiber, fine sand, water and a water reducing agent. P.II 52.5 cement accounts for 27 percent of the total weight of the UHPC; the silica fume accounts for 18 percent of the cement consumption; the mineral powder accounts for 35% of the cement; the polymer is water-soluble epoxy resin, and the using amount of the water-soluble epoxy resin is 1.6 percent of the total mass; the length of the nano modified high-modulus polyethylene crude fiber is 7mm, the diameter is 0.15mm, the elastic modulus is 150GPa, the tensile strength is 2540MPa, and the volume mixing amount is 2.0 percent; the fine sand accounts for 45.8 percent of the total weight of the UHPC, the sand is quartz sand, and the particle size is 40 meshes; the water-cement ratio is 0.17; the polycarboxylic acid water reducing agent accounts for 1.8% of the cement consumption.
The reinforcing process comprises the following steps: firstly, roughening the surface of a pool wall, then treating a raw steel bar by using a rust remover, repairing a crack on the pool wall by using UHPC (ultra high performance concrete), then smearing UHPC with the thickness of 6mm within the length range of the crack, pasting a layer of bidirectional alkali-resistant glass fiber grids, wherein the hole pitch of the alkali-resistant glass fiber is 7mm, and the tensile force per linear meter of the fiber grids in the directions of longitude and latitude 2 is 112 kN; then, UHPC with the thickness of 4mm is smeared, and a layer of alkali-resistant glass fiber grid is pasted (the grid size and the performance are the same as those of the first layer); then, UHPC was smeared to a thickness of 6 mm.
After the sewage tank is reinforced, tests show that the pressure-resistant bearing capacity of the tank wall is improved by 81%, the impermeability is improved by 45%, the corrosion resistance is improved by 56%, and the shock-resistant ductility coefficient is improved by 62%.
Example 4:
a bidirectional plate on an original offshore platform is in an alkali environment for a long time, under the load effects of sea wave beating, ship collision and the like, a plurality of concrete protective layers are peeled off, a plurality of cracks with the width of 1-2 cm are formed, steel bars are seriously corroded, and a local concrete protective layer is peeled off. And reinforcing by adopting a carbon fiber network reinforced UHPC. The raw materials of UHPC are: portland cement, silica fume, mineral powder, a polymer, nano modified high-modulus polyethylene crude fiber, fine sand, water and a water reducing agent. P.II 52.5 cement accounts for 25 percent of the total weight of the UHPC; the silica fume accounts for 18 percent of the cement consumption; the mineral powder accounts for 63% of the cement; the polymer is water-soluble epoxy resin, and the using amount of the water-soluble epoxy resin is 1.8 percent of the total mass; the length of the nano modified high-modulus polyethylene crude fiber is 7mm, the diameter is 0.15mm, the elastic modulus is 150GPa, the tensile strength is 2540MPa, and the volume mixing amount is 2.0 percent; the fine sand accounts for 45.6 percent of the total weight of the UHPC, the sand is quartz sand, and the particle size is 80 meshes; the water-cement ratio is 0.18; the polycarboxylate superplasticizer accounts for 1.9% of the cement consumption.
The reinforcing process comprises the following steps: firstly, roughening the lower surface of a bidirectional plate, then processing a raw steel bar by using a rust remover, then filling a crack at the bottom of the plate by using UHPC (ultra high performance polycarbonate), smearing UHPC with the thickness of 7mm within the length range of the crack, pasting a bidirectional layer of carbon fiber grids, wherein the hole pitch of the carbon fiber is 10mm, and the tensile force per linear meter of the fiber grids in the warp and weft directions is 112 kN; then, UHPC with the thickness of 4mm is smeared, and a layer of bidirectional carbon fiber grids (the size and the performance of the grids are the same as those of the first layer) is pasted; then, UHPC with the thickness of 5mm is smeared, and a layer of bidirectional carbon fiber grids are pasted, the hole pitch of the carbon fiber is 10mm, and the tensile force per linear meter of the fiber grids in the warp and weft directions is 172 kN; finally, UHPC with a thickness of 6mm was applied.
After reinforcement, tests show that the bending resistance bearing capacity of the bidirectional plate is improved by 56%, the corrosion resistance is improved by 65%, and the shock resistance ductility coefficient is improved by 52%.
Claims (10)
1. A pole reinforcing method based on fiber grid reinforced UHPC is characterized by comprising the following steps:
filling up the damaged part of the electric pole by adopting fiber mesh reinforced UHPC;
coating an interface agent on the corresponding area of the damaged part on the filled electric pole wall;
coating a fiber grid reinforced UHPC layer with the thickness of 2-7 mm on the interface agent, and pasting a fiber grid layer on the fiber grid reinforced UHPC layer;
repeatedly coating a next fiber grid reinforced UHPC layer outside the fiber grid layer, and attaching a next fiber grid layer on the next fiber grid reinforced UHPC layer until the number of the fiber grid reinforced UHPC layers reaches a preset number; the thickness of the fiber grid reinforced UHPC layer from the second fiber grid reinforced UHPC layer on the inner side to the fiber grid reinforced UHPC layer on the outermost side is increased in sequence, and the thickness of the fiber grid reinforced UHPC layer on the outermost side is 4-6 mm.
2. The method for reinforcing the electric pole based on the fiber mesh reinforced UHPC as claimed in claim 1, wherein the fiber mesh layer is at least one of a carbon fiber mesh layer, an aramid fiber mesh layer, an alkali-resistant glass fiber mesh layer, a basalt fiber mesh layer, a polyvinyl alcohol fiber mesh layer and a polyamide fiber mesh layer, and the fiber mesh layer is made by bidirectional weaving, hybrid weaving or hybrid mesh pasting.
3. The method for reinforcing the electric pole based on the fiber mesh reinforced UHPC as claimed in claim 2, wherein when the fiber mesh reinforced UHPC layer is coated, the whole circumference of the damaged part of the electric pole wall is coated.
4. The method for reinforcing the electric pole based on the fiber mesh reinforced UHPC as claimed in claim 2 or 3, wherein after the number of the fiber mesh reinforced UHPC layers reaches a predetermined number of layers, the water-proofing treatment and the corrosion-proofing treatment are sequentially carried out.
5. The electric pole reinforcing method based on the fiber mesh reinforced UHPC (ultra high performance polycarbonate) as claimed in claim 4, wherein the predetermined number of layers is 3-6.
6. The pole reinforcing method based on the fiber mesh reinforced UHPC (ultra high performance concrete) as claimed in claim 5, wherein the distance between the edge of the fiber mesh reinforced UHPC layer in the length direction of the pole and the edge of the damaged part in the length direction of the pole is more than or equal to 30 cm.
7. A method for reinforcing a pole based on fiber mesh reinforced UHPC as claimed in claim 5 or 6, characterized in that said fiber mesh layer forms a closed loop along the circumference of said pole, and the overlapping length is more than or equal to 30 cm.
8. The method for reinforcing the electric pole based on the fiber grid reinforced UHPC as claimed in any one of claims 1 to 3, wherein the fiber grid reinforced UHPC is composed of cement, silica fume, mineral powder, polymer, nano modified high modulus polyethylene crude fiber, fine sand, water and water reducing agent;
the cement accounts for 22-29% of the total mass of the fiber grid reinforced UHPC;
the silica fume accounts for 15-18% of the total mass of the cement;
the mineral powder accounts for 22-63% of the total mass of the cement;
the polymer accounts for 1.5-2.0% of the total mass of the fiber grid reinforced UHPC;
the length of the nano modified high-modulus polyethylene crude fiber is 7-16 mm, the diameter is 0.10-0.18 mm, the elastic modulus is 101-150 GPa, the tensile strength is 2480-2940 MPa, and the volume mixing amount is 0.7-2.5%;
the fine sand accounts for 40-50% of the total mass of the fiber grid reinforced UHPC;
the water reducing agent accounts for 1.7-2.0% of the total mass of the cement;
the balance being water.
9. The method for reinforcing the electric pole based on the fiber grid reinforced UHPC as claimed in any one of claims 1 to 3, wherein the fiber grid reinforced UHPC comprises cement, silica fume, mineral powder, polymer, nano modified high modulus polyethylene crude fiber, nano modified high modulus polyvinyl alcohol crude fiber, fine sand, water and water reducing agent;
the cement accounts for 22-29% of the total mass of the fiber grid reinforced UHPC;
the silica fume accounts for 15-18% of the total mass of the cement;
the mineral powder accounts for 22-63% of the total mass of the cement;
the polymer accounts for 1.5-2.0% of the total mass of the fiber grid reinforced UHPC;
the length of the nano modified high-modulus polyethylene crude fiber is 7-16 mm, the diameter is 0.10-0.18 mm, the elastic modulus is 101-150 GPa, the tensile strength is 2480-2940 MPa, and the volume mixing amount is 0.7-2.5%;
the length of the nano modified high-modulus polyvinyl alcohol crude fiber is 7-20 mm, the diameter of the nano modified high-modulus polyvinyl alcohol crude fiber is 0.10-0.28 mm, the elastic modulus of the nano modified high-modulus polyvinyl alcohol crude fiber is 54-60 GPa, the tensile strength of the nano modified high-modulus polyvinyl alcohol crude fiber is 1450-1960 MPa, and the volume mixing amount of the nano modified high-modulus polyvinyl alcohol crude fiber is 0.7-.
The fine sand accounts for 40-50% of the total mass of the fiber grid reinforced UHPC;
the water reducing agent accounts for 1.7-2.0% of the total mass of the cement;
the balance being water.
10. The method for reinforcing electric pole based on fiber mesh reinforced UHPC as claimed in claim 9, wherein said polymer is water soluble epoxy resin.
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