CN107023211B - Ultra-high performance concrete pole containing composite fibers - Google Patents
Ultra-high performance concrete pole containing composite fibers Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- 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
- E04H12/12—Structures made of specified materials of concrete or other stone-like material, with or without internal or external reinforcements, e.g. with metal coverings, with permanent form elements
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- 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
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Abstract
The invention relates to an ultra-high performance concrete pole containing composite fibers, which comprises a hollow pole body with a multi-layer structure, wherein the multi-layer structure comprises a first composite layer, a second composite layer and a third composite layer which are coaxially distributed in sequence from inside to outside; the first composite layer is a polyvinyl alcohol fiber composite layer made of ultra-high performance concrete containing polyvinyl alcohol fibers; the second composite layer is a carbon fiber composite layer manufactured by adopting ultra-high performance concrete containing carbon fibers; the third composite layer is a steel fiber composite layer manufactured by adopting ultra-high performance concrete containing steel fibers. Compared with the prior art, the invention has the advantages of high tensile strength, long service life, wide application range, high safety and the like.
Description
Technical Field
The invention relates to the field of power transmission and transformation engineering, in particular to an ultra-high performance concrete electric pole containing composite fibers.
Background
At present, most telegraph poles in China are made of ordinary concrete provided with a steel reinforcement framework, and a small part of the telegraph poles are made of wooden telegraph poles and gradually adopt the pole made of ultra-high-performance concrete.
However, the general concrete pole body provided with the reinforcement cage is not high in concrete strength, and particularly, the general concrete is low in tensile strength. When the line is longer, the eccentric force that acts on the wire pole end is very big, and the pole body easily appears pulling crack and destroys, leads to its durability relatively poor, and it is troublesome to repair in later stage, and the replacement brings a lot of trouble, also causes very big pressure to economy, material resources, manpower. Moreover, because the steel bars are required to be bound before forming, the common electric pole is high in quality, the construction procedure is complex, and time and labor are wasted. Because of its heavy weight, when the pole is located in inconvenient areas such as mountain areas, the transportation of wire pole, installation will have very big difficulty.
In addition, the wooden telegraph pole is light in weight and convenient to erect, and some lines such as telephone lines are small in bearing and pulling force, so that the wooden telegraph pole is adequate, and the telephone lines are convenient to move if changed. However, the applicable timber is gradually scarce, the appearance of the cement telegraph pole is smooth and beautiful, the city is more convenient to beautify, however, the cement telegraph pole is also easy to corrode, and the maintenance cost is higher.
When only fibers are incorporated, it is easier to centrifuge the tapered pole, and the use of a tapered pole provides a safer option for areas where wind is high throughout the year.
Although the ultra-high performance concrete pole has more advantages than the traditional concrete pole or wooden pole, the ultra-high performance concrete pole is difficult to centrifugally mold and cannot be produced in a large scale and in a factory, so that the existing ultra-high performance concrete pole usually adopts a mold pouring method. In addition, even though UHPC can be centrifugally formed, due to the high density of steel fibers, the steel fibers are mainly distributed on the outer layer during forming, and when the inner layer concrete cracks and the outer layer steel fibers are pulled out, the electric pole quickly loses bearing capacity. Therefore, the utility model provides a telegraph pole which is simple and economical to manufacture, convenient to construct and good in stress performance, and has important significance for improving the power transmission industry in China.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the ultra-high performance concrete pole containing the composite fiber. The compressive strength of the high-efficiency water reducer can be more than 100MPa by increasing the high-efficiency water reducer and controlling the water cement ratio below 0.18; meanwhile, through centrifugal casting, the three (steel fiber, carbon fiber and PVA) mixed fibers are distributed more orderly than UHPC commonly used in the building and are respectively distributed in the inner layer, the middle layer and the outer layer of the cement pole according to different densities, so that the tensile strength of the cement pole can be remarkably improved. The improvement of the tensile strength of the ultra-high performance concrete (UHPC) material can obviously improve the use benefit of the cement pole.
The aim of the invention can be achieved by the following technical scheme:
the ultra-high performance concrete pole comprises a hollow pole body with a multi-layer structure, wherein the multi-layer structure comprises a first composite layer, a second composite layer and a third composite layer which are coaxially distributed in sequence from inside to outside;
the first composite layer is a polyvinyl alcohol fiber composite layer made of ultra-high performance concrete containing polyvinyl alcohol fibers;
the second composite layer is a carbon fiber composite layer manufactured by adopting ultra-high performance concrete containing carbon fibers;
the third composite layer is a steel fiber composite layer manufactured by adopting ultra-high performance concrete containing steel fibers.
The manufacturing raw materials of the first composite layer comprise ultra-high performance concrete raw materials and polyvinyl alcohol fibers, the manufacturing raw materials of the second composite layer comprise ultra-high performance concrete raw materials and carbon fibers, and the manufacturing raw materials of the third composite layer comprise ultra-high performance concrete raw materials and steel fibers;
the water-cement ratio of the ultra-high performance concrete raw material is not more than 0.18, the polyvinyl alcohol fiber accounts for 5.8-6.2% of the total volume of the mixed raw materials for the first composite layer, the carbon fiber accounts for 5.8-6.2% of the total volume of the mixed raw materials for the second composite layer, and the steel fiber accounts for 5.8-6.2% of the total volume of the mixed raw materials for the third composite layer.
The ultra-high performance concrete raw materials comprise cement, silica fume, fine sand, metakaolin, magnesium oxide, water and a high-efficiency water reducing agent, wherein the mass ratio of the cement, the silica fume, the fine sand, the metakaolin, the magnesium oxide, the water and the high-efficiency water reducing agent is as follows: 0.8-1.2:0.23-0.27:1-1.4:0.08-0.12:0.08-0.12:0.2-0.24:0.01-0.014.
The cement is cement P.O 42.5;
the average grain diameter of the silicon powder is 0.18-0.22 mu m, the SiO2 content is more than or equal to 90%, and the specific surface area is 18.9-18.94 m 2 Per gram, the density is 1.8-2.2 g/cm 3 ；
The average grain diameter of the fine sand is not more than 0.63mm, and the density is 2.4-2.8 g/cm 3 ；
The average particle size of the metakaolin is 10.64-10.68 um;
the average particle size of the magnesium oxide is 72-76 um;
the water reducing rate of the high-efficiency water reducing agent is more than 25%.
The ratio of the radial thickness of the first composite layer to the radial thickness of the second composite layer to the radial thickness of the third composite layer is 0.8-1.2:1.8-2.2:2.8-3.2.
The hollow body of rod is the multistage, and the cover is equipped with the ring flange on the bottom of multistage hollow body of rod from top to bottom in proper order, and the bottom external diameter of every section hollow body of rod is less than the top internal diameter of next section hollow body of rod, and the ring flange of the bottom of every section hollow body of rod passes through the bolt to be connected with the top terminal surface of next section hollow body of rod, is equipped with the blotter between the adjacent hollow body of rod, the interval between ring flange of the bottom of every section hollow body of rod and the top terminal surface of next section hollow body of rod and the interval between the top outer wall of every section hollow body of rod and the top inner wall of next section hollow body of rod are filled to the blotter.
The preparation method of the ultra-high performance concrete pole containing the composite fiber comprises the following steps:
s1: polishing the inner wall of the centrifugal machine, correcting the size of a test piece, and coating a release agent;
s2: sequentially pouring weighed cement, silica powder, fine sand, metakaolin, magnesium oxide and polyvinyl alcohol fibers into a stirring pot, dry-stirring, and slowly adding water which is uniformly mixed with the high-efficiency water reducer into the stirring pot for two times to obtain a mixture for manufacturing a first composite layer;
the polyvinyl alcohol fiber is replaced by carbon fiber and steel fiber, and the same stirring method is adopted to obtain a mixture for manufacturing the second composite layer and the third composite layer;
s3: after weighing the three mixtures, pouring the three mixtures into a centrifugal machine from outside to inside in layers, and compacting and forming by adopting a centrifugal process;
s4: after standing for a set time after molding, steam heating maintenance is carried out;
s5: and (5) demolding and curing to obtain the hollow rod body.
The specific process of the centrifugation technology in the step S3 is as follows: rotating at a low speed of 1.4-1.8 g for 2-4 minutes; rotating for 4-6 minutes at a medium speed of 6.1-6.5 g; rotating at a high speed of 25-25.4 g for 4-6 minutes; rotating for 0.8-1.5 minutes at a medium speed of 6.1-6.5 g; and rotating at a low speed of 1.4-1.8 g for 0.8-1.5 minutes.
The rotating speed at low speed is 80-100 r/min; the rotation speed of the medium speed is 170-190 r/min; the high-speed rotating speed is 350-370 r/min.
The weighing ratio of the three mixtures in the step S3 is 7-11:13-17:34-38.
Compared with the prior art, the invention has the following advantages:
1. the ultra-high performance concrete (UHPC) pole adopting the technical scheme and doped with the composite fiber replaces the traditional longitudinal bars with the composite fiber with the density smaller than that of the steel bars, thereby not only reducing the bar arrangement rate on the basis of keeping the bending resistance of the pole, but also overcoming the defect of great self-weight of the traditional pole caused by complex process of binding the steel bars and large bar arrangement rate. The reinforcement cage is not added, the processing of the reinforcement and the manufacturing process of the reinforcement cage are omitted, the problem of the thickness of the protective layer of the longitudinal ribs in the electric pole is not needed to be considered, and the time for manufacturing the electric pole is obviously reduced.
2. The ultra-high performance concrete (UHPC) pole body doped with the composite fiber adopts ultra-high performance concrete casting, has high strength, high durability and high corrosion resistance, can avoid the problem that the pole body cracks due to physical factors such as collision and the like, and the problem that common poles and steel poles are easy to corrode due to chemical factors, and reduces the high cost of maintenance.
3. The ultra-high performance concrete (UHPC) pole doped with the composite fiber adopts the technical scheme, and three different steel fibers are respectively stirred with the UHPC fresh mixture, so that the problem of fiber agglomeration is avoided, and the fibers can be better distributed along the longitudinal direction of the pole. The layered distribution of the three fibers of different densities can more uniformly increase the ductility of the cross section of the pole.
4. The ultra-high performance concrete (UHPC) pole adopting the technical scheme and doped with the composite fiber has the advantages that the two sections of pole with inconsistent diameters are connected, the diameter of the upper pole body is reduced due to smaller bearing bending moment, the consumption of concrete is saved, and the problem caused by abrupt change of the section can be greatly reduced by using the rubber buffer pad. And on one hand, the extrusion of the two sections of the rod bodies can be buffered, and on the other hand, the flange plate and the lower section of the rod bodies are used for reducing the damage to concrete caused by the fixation of bolts.
5. The electric pole can be used as a common electric pole, is suitable for installation of different power grids, has compressive strength exceeding 100MPa, can replace an iron tower, and has strong practicability.
6. The thickness ratio among the three composite layers is reasonably designed, and the axial strength and the hoop strength of the whole rod body are improved.
7. Can be used after being assembled into two sections or a plurality of sections according to actual demands, has wider application range, higher safety, no maintenance in the use process and long service life.
Drawings
FIG. 1 is a schematic view of a hollow rod body formed according to the present invention;
FIG. 2 is a schematic cross-sectional view of a hollow rod body after molding;
fig. 3 is a cross-sectional view of a connection of two hollow shafts of different diameters.
In the figure: 1. the hollow rod body, 2, the third composite layer, 3, the second composite layer, 4, the first composite layer, 5, the blotter, 6, the bolt, 7, the ring flange, 8, the nut.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
Example 1
The ultra-high performance concrete pole containing composite fiber comprises a hollow pole body 1 with a multi-layer structure, wherein the multi-layer structure comprises a first composite layer 4, a second composite layer 3 and a third composite layer 2 which are coaxially distributed in sequence from inside to outside, as shown in figures 1 and 2;
the first composite layer 4 is a polyvinyl alcohol (PVA) fiber composite layer made of ultra-high performance concrete containing polyvinyl alcohol fibers;
the second composite layer 3 is a carbon fiber composite layer made of ultra-high performance concrete containing carbon fibers;
the third composite layer 2 is a steel fiber composite layer made of ultra-high performance concrete containing steel fibers.
The manufacturing raw materials of the first composite layer 4 comprise ultra-high performance concrete raw materials and polyvinyl alcohol fibers, the manufacturing raw materials of the second composite layer 3 comprise ultra-high performance concrete raw materials and carbon fibers, and the manufacturing raw materials of the third composite layer 2 comprise ultra-high performance concrete raw materials and steel fibers;
wherein, the water-cement ratio of the ultra-high performance concrete raw material is not more than 0.18, the polyvinyl alcohol fiber accounts for 6% of the total volume after the raw materials for the first composite layer 4 are mixed, the carbon fiber accounts for 6% of the total volume after the raw materials for the second composite layer 3 are mixed, and the steel fiber accounts for 6% of the total volume after the raw materials for the third composite layer 2 are mixed.
The ultra-high performance concrete raw material is prepared from the following raw materials:
cement, p.o42.5 common concrete acid salt cement;
silica powder with average grain size of 0.20 mu m, siO2 content of 90% or more and specific surface area of 18.92m 2 Per g, density of 2.0g/cm 3 ；
Fine sand with average grain size not greater than 0.63mm and density of 2.6g/cm 3 ；
Metakaolin having an average particle size of 10.66, 10.66 um;
magnesium oxide having an average particle diameter of 74 μm as a catalyst;
the water adopts common tap water;
the water reducing rate of the high-efficiency water reducing agent is more than 25%;
the mass ratio of the materials is as follows:
cement, silica powder, fine sand, metakaolin, magnesium oxide, water, high-efficiency water reducer=1:0.25:1.2:0.1:0.1:0.22:0.012.
The preparation method of the ultra-high performance concrete pole containing the composite fiber comprises the following steps:
s1: polishing the inner wall of the centrifugal machine, correcting the size of a test piece, and coating a release agent;
s2: sequentially pouring weighed cement, silica powder, fine sand, metakaolin, magnesium oxide and polyvinyl alcohol fibers into a stirring pot, covering a pot cover, dry-mixing for 4-6min, slowly adding water which is uniformly mixed with the high-efficiency water reducer into the stirring pot for two times, covering the pot cover, and stirring until a matrix has certain fluidity for about 2-3min to obtain a mixture for manufacturing the first composite layer 4;
the polyvinyl alcohol fiber is replaced by carbon fiber and steel fiber, and the same stirring method is adopted to obtain a mixture for manufacturing the second composite layer 3 and a mixture for manufacturing the third composite layer 2;
s3: after weighing the three mixtures, pouring the three mixtures into a centrifugal machine from outside to inside in layers, and compacting and forming by adopting a centrifugal process;
s4: after standing for a set time after molding, steam heating maintenance is carried out;
s5: and (5) demolding and curing to obtain the hollow rod body 1.
The specific process of the centrifugation technology in the step S3 is as follows: pouring the mixture into layers by centrifugation, namely pouring all three layers of mixture into layers, and centrifuging the mixture together, wherein the weighing ratio of the three mixtures is 9:15:36, and the centrifugation process is as follows:
centrifugal parameter of annular electric pole
Wherein g=9.8m/s, the gravity acceleration, the length of the hollow rod body 1 may be 11-15 m, in this embodiment, the length of the hollow rod body 1 is 13m, and the ratio of the radial thickness of the first composite layer 4, the radial thickness of the second composite layer 3, and the radial thickness of the third composite layer 2 is 1:2:3. The super-high performance concrete adopted by the preparation method can lead the compressive strength to exceed 100MPa after the water-cement ratio is controlled below 0.18 by adding the high-efficiency water reducer; meanwhile, through centrifugal casting, the three (steel fiber, carbon fiber and PVA) mixed fibers are distributed more orderly than UHPC commonly used in the building and are respectively distributed in the inner layer, the middle layer and the outer layer of the cement pole according to different densities, so that the tensile strength of the cement pole can be remarkably improved. The improvement of the tensile strength of the ultra-high performance concrete (UHPC) material can obviously improve the use benefit of the cement pole.
During engineering installation, the shape of the hollow rod body 1 is a cylinder, the hollow rod bodies 1 are sequentially arranged from top to bottom, the flange 7 is sleeved on the bottom end of each hollow rod body 1, the flange 7 is used for connecting two sections of rod bodies, the outer diameter of the bottom end of each section of hollow rod body 1 is smaller than the inner diameter of the top end of the next section of hollow rod body 1, the flange 7 at the bottom end of each section of hollow rod body 1 is connected with the top end face of the next section of hollow rod body 1 through the bolts 6, the buffer cushion 5 is arranged between the adjacent hollow rod bodies 1, the buffer cushion 5 fills a gap between the flange 7 at the bottom end of each section of hollow rod body 1 and the top end face of the next section of hollow rod body 1 and a gap between the outer wall of the bottom end of each section of hollow rod body 1 and the inner wall of the top end of the next section of hollow rod body 1, the buffer device is used for buffering extrusion of the hollow rod body 1 and the flange 7, service life is prolonged, and the buffer cushion 5 adopts rubber buffer cushions.
The top end face of each section of hollow rod body 1 is provided with a plurality of bolt holes, the plurality of bolt holes are uniformly distributed along the circumference, nuts 8 matched with the bolts 6 are reserved in each bolt hole, the reserved nuts 8 are lengthened nuts, the upper section and the lower section of hollow rod body 1 are guaranteed to be connected and fastened through the flange 7 and the nuts 8, the nuts 8 are embedded in the electric rod during centrifugal forming of the electric rod, and the bolts 6 are used for connecting the flange 7 and the nuts 8.
The number of bolt holes is 6~10, adopts 8 bolt holes symmetrical distribution's structure in this embodiment.
As shown in fig. 3, the shaft of the hollow shaft body 1 is made of ultra-high performance concrete (UHPC), the UHPC material is prepared, and then the factory casting is performed, the diameters of the shafts of the upper and lower hollow shaft bodies 1 are not uniform, the outer diameter of the upper hollow shaft body 1 is smaller than the inner diameter of the lower hollow shaft body 1, and a rubber buffer pad can be placed in the middle. The UHPC comprises cement, silica powder, fine sand, water, metakaolin, magnesium oxide, composite fiber, high-efficiency water reducing agent and the like, has the performances of high strength, high toughness, high durability, high corrosion resistance and the like, and can well provide the working performance of the high-efficiency telegraph pole.
Example two
The ultra-high performance concrete pole comprises a hollow pole body 1 with a multi-layer structure, wherein the multi-layer structure comprises a first composite layer 4, a second composite layer 3 and a third composite layer 2 which are coaxially distributed in sequence from inside to outside;
the first composite layer 4 is a polyvinyl alcohol fiber composite layer made of ultra-high performance concrete containing polyvinyl alcohol fibers;
the second composite layer 3 is a carbon fiber composite layer made of ultra-high performance concrete containing carbon fibers;
the third composite layer 2 is a steel fiber composite layer made of ultra-high performance concrete containing steel fibers.
The manufacturing raw materials of the first composite layer 4 comprise ultra-high performance concrete raw materials and polyvinyl alcohol fibers, the manufacturing raw materials of the second composite layer 3 comprise ultra-high performance concrete raw materials and carbon fibers, and the manufacturing raw materials of the third composite layer 2 comprise ultra-high performance concrete raw materials and steel fibers;
wherein, the water-cement ratio of the ultra-high performance concrete raw material is not more than 0.18, the polyvinyl alcohol fiber accounts for 5.8% of the total volume after the raw materials for the first composite layer 4 are mixed, the carbon fiber accounts for 5.8% of the total volume after the raw materials for the second composite layer 3 are mixed, and the steel fiber accounts for 5.8% of the total volume after the raw materials for the third composite layer 2 are mixed.
The ultra-high performance concrete raw materials comprise cement, silica fume, fine sand, metakaolin, magnesium oxide, water and a high-efficiency water reducing agent, wherein the mass ratio of the cement, the silica fume, the fine sand, the metakaolin, the magnesium oxide, the water and the high-efficiency water reducing agent is as follows: 0.8:0.23:1:0.08:0.08:0.2:0.01.
The cement is cement P.O 42.5;
the average grain diameter of the silicon powder is 0.18 mu m, the SiO2 content is more than or equal to 90 percent, and the specific surface area is 18.9m 2 Per gram, density of 1.8g/cm 3 ；
The average grain diameter of the fine sand is not more than 0.63mm, and the density is 2.4g/cm 3 ；
The average particle size of metakaolin is 10.64 um;
the average particle size of the magnesium oxide is 72um;
the water reducing rate of the high-efficiency water reducing agent is more than 25 percent.
The ratio of the radial thickness of the first composite layer 4, the radial thickness of the second composite layer 3 and the radial thickness of the third composite layer 2 is 0.8:1.8:2.8.
The preparation method of the ultra-high performance concrete pole containing the composite fiber comprises the following steps:
s1: polishing the inner wall of the centrifugal machine, correcting the size of a test piece, and coating a release agent;
s2: sequentially pouring weighed cement, silica powder, fine sand, metakaolin, magnesium oxide and polyvinyl alcohol fibers into a stirring pot, dry-stirring, and slowly adding water which is uniformly mixed with the high-efficiency water reducer into the stirring pot for two times to obtain a mixture for manufacturing the first composite layer 4;
the polyvinyl alcohol fiber is replaced by carbon fiber and steel fiber, and the same stirring method is adopted to obtain a mixture for manufacturing the second composite layer 3 and the third composite layer 2;
s3: after weighing the three mixtures, pouring the three mixtures into a centrifugal machine from outside to inside in layers, and compacting and forming by adopting a centrifugal process;
s4: after standing for a set time after molding, steam heating maintenance is carried out;
s5: and (5) demolding and curing to obtain the hollow rod body 1.
The specific process of the centrifugation technology in the step S3 is as follows: rotating for 2 minutes at a low speed of acceleration of 1.4g and a rotating speed of 80 r/min; rotating for 4 minutes at a medium speed of 6.1g acceleration and 170r/min rotation speed; rotating at a high speed of 25g and a rotating speed of 350r/min for 4 minutes; rotating for 0.8 min at a medium speed of acceleration of 6.1g and a rotating speed of 170 r/min; the motor rotates at a low speed of 80r/min for 0.8 minutes at an acceleration of 1.4 g.
The weighing ratio of the three mixtures in the step S3 is 7:13:34.
Example III
The ultra-high performance concrete pole comprises a hollow pole body 1 with a multi-layer structure, wherein the multi-layer structure comprises a first composite layer 4, a second composite layer 3 and a third composite layer 2 which are coaxially distributed in sequence from inside to outside;
the first composite layer 4 is a polyvinyl alcohol fiber composite layer made of ultra-high performance concrete containing polyvinyl alcohol fibers;
the second composite layer 3 is a carbon fiber composite layer made of ultra-high performance concrete containing carbon fibers;
the third composite layer 2 is a steel fiber composite layer made of ultra-high performance concrete containing steel fibers.
The manufacturing raw materials of the first composite layer 4 comprise ultra-high performance concrete raw materials and polyvinyl alcohol fibers, the manufacturing raw materials of the second composite layer 3 comprise ultra-high performance concrete raw materials and carbon fibers, and the manufacturing raw materials of the third composite layer 2 comprise ultra-high performance concrete raw materials and steel fibers;
wherein, the water-cement ratio of the ultra-high performance concrete raw material is not more than 0.18, the polyvinyl alcohol fiber accounts for 6.2% of the total volume after the raw materials for the first composite layer 4 are mixed, the carbon fiber accounts for 6.2% of the total volume after the raw materials for the second composite layer 3 are mixed, and the steel fiber accounts for 6.2% of the total volume after the raw materials for the third composite layer 2 are mixed.
The ultra-high performance concrete raw materials comprise cement, silica fume, fine sand, metakaolin, magnesium oxide, water and a high-efficiency water reducing agent, wherein the mass ratio of the cement, the silica fume, the fine sand, the metakaolin, the magnesium oxide, the water and the high-efficiency water reducing agent is as follows: 1.2:0.27:1.4:0.12:0.12:0.24:0.014.
The cement is cement P.O 42.5;
the average grain diameter of the silicon powder is 0.22 mu m, the SiO2 content is more than or equal to 90 percent, and the specific surface area is 18.94m 2 Per g, density of 2.2g/cm 3 ；
The average grain diameter of the fine sand is not more than 0.63mm, and the density is 2.8g/cm 3 ；
The average particle size of metakaolin is 10.68 um;
the average particle size of the magnesium oxide is 76um;
the water reducing rate of the high-efficiency water reducing agent is more than 25 percent.
The ratio of the radial thickness of the first composite layer 4, the radial thickness of the second composite layer 3 and the radial thickness of the third composite layer 2 is 1.2:2.2:3.2.
The preparation method of the ultra-high performance concrete pole containing the composite fiber comprises the following steps:
s1: polishing the inner wall of the centrifugal machine, correcting the size of a test piece, and coating a release agent;
s2: sequentially pouring weighed cement, silica powder, fine sand, metakaolin, magnesium oxide and polyvinyl alcohol fibers into a stirring pot, dry-stirring, and slowly adding water which is uniformly mixed with the high-efficiency water reducer into the stirring pot for two times to obtain a mixture for manufacturing the first composite layer 4;
the polyvinyl alcohol fiber is replaced by carbon fiber and steel fiber, and the same stirring method is adopted to obtain a mixture for manufacturing the second composite layer 3 and the third composite layer 2;
s3: after weighing the three mixtures, pouring the three mixtures into a centrifugal machine from outside to inside in layers, and compacting and forming by adopting a centrifugal process;
s4: after standing for a set time after molding, steam heating maintenance is carried out;
s5: and (5) demolding and curing to obtain the hollow rod body 1.
The specific process of the centrifugation technology in the step S3 is as follows: rotating for 4 minutes at a low speed of acceleration of 1.8g and a rotating speed of 100r/min; rotating at a medium speed of 6.5g acceleration and 190r/min for 6 minutes; rotating at a high speed of 25.4g acceleration and 370r/min for 6 minutes; rotating at a medium speed of 6.5g acceleration and 190r/min for 1.5 min; the motor rotates at a low speed of 100r/min for 1.5 minutes at an acceleration of 1.8 g.
The weighing ratio of the three mixtures in the step S3 is 11:17:38.
Claims (9)
1. The ultra-high performance concrete pole is characterized by comprising a hollow pole body with a multi-layer structure, wherein the multi-layer structure comprises a first composite layer, a second composite layer and a third composite layer which are coaxially distributed in sequence from inside to outside;
the first composite layer is a polyvinyl alcohol fiber composite layer made of ultra-high performance concrete containing polyvinyl alcohol fibers;
the second composite layer is a carbon fiber composite layer manufactured by adopting ultra-high performance concrete containing carbon fibers;
the third composite layer is a steel fiber composite layer made of ultra-high performance concrete containing steel fibers;
the manufacturing raw materials of the first composite layer comprise ultra-high performance concrete raw materials and polyvinyl alcohol fibers, the manufacturing raw materials of the second composite layer comprise ultra-high performance concrete raw materials and carbon fibers, and the manufacturing raw materials of the third composite layer comprise ultra-high performance concrete raw materials and steel fibers;
the water-cement ratio of the ultra-high performance concrete raw material is not more than 0.18, the polyvinyl alcohol fiber accounts for 5.8-6.2% of the total volume of the mixed raw materials for the first composite layer, the carbon fiber accounts for 5.8-6.2% of the total volume of the mixed raw materials for the second composite layer, and the steel fiber accounts for 5.8-6.2% of the total volume of the mixed raw materials for the third composite layer.
2. The ultra-high performance concrete pole containing composite fibers according to claim 1, wherein the ultra-high performance concrete raw materials comprise cement, silica fume, fine sand, metakaolin, magnesium oxide, water and a high efficiency water reducing agent, wherein the mass ratio of the cement, the silica fume, the fine sand, the metakaolin, the magnesium oxide, the water and the high efficiency water reducing agent is: 0.8-1.2:0.23-0.27:1-1.4:0.08-0.12:0.08-0.12:0.2-0.24:0.01-0.014.
3. An ultra-high performance concrete pole having composite fibers according to claim 2, wherein said cement is cement p.o 42.5;
the average grain diameter of the silicon powder is 0.18-0.22 mu m, siO 2 The content is more than or equal to 90 percent, and the specific surface area is 18.9-18.94 m 2 Per gram, the density is 1.8-2.2 g/cm 3 ；
The average grain diameter of the fine sand is not more than 0.63mm, and the density is 2.4-2.8 g/cm 3 ；
The average particle size of the metakaolin is 10.64-10.68 um;
the average particle size of the magnesium oxide is 72-76 um;
the water reducing rate of the high-efficiency water reducing agent is more than 25%.
4. The ultra-high performance concrete pole containing composite fibers according to claim 1, wherein the ratio of the radial thickness of the first composite layer to the radial thickness of the second composite layer to the radial thickness of the third composite layer is 0.8-1.2:1.8-2.2:2.8-3.2.
5. The ultra-high performance concrete pole containing composite fibers according to claim 1, wherein the hollow pole bodies are multiple sections, the multiple sections of hollow pole bodies are sequentially arranged from top to bottom, a flange is sleeved on the bottom end of each section of hollow pole body, the outer diameter of the bottom end of each section of hollow pole body is smaller than the inner diameter of the top end of the next section of hollow pole body, the flange at the bottom end of each section of hollow pole body is connected with the top end face of the next section of hollow pole body through bolts, a buffer pad is arranged between adjacent hollow pole bodies, and the buffer pad fills a gap between the flange at the bottom end of each section of hollow pole body and the top end face of the next section of hollow pole body and a gap between the bottom outer wall of each section of hollow pole body and the top inner wall of the next section of hollow pole body.
6. A method for preparing the ultra-high performance concrete pole containing composite fiber according to claim 1, comprising the steps of:
s1: polishing the inner wall of the centrifugal machine, correcting the size of a test piece, and coating a release agent;
s2: sequentially pouring weighed cement, silica powder, fine sand, metakaolin, magnesium oxide and polyvinyl alcohol fibers into a stirring pot, dry-stirring, and slowly adding water which is uniformly mixed with the high-efficiency water reducer into the stirring pot for two times to obtain a mixture for manufacturing a first composite layer;
the polyvinyl alcohol fiber is replaced by carbon fiber and steel fiber, and the same stirring method is adopted to obtain a mixture for manufacturing the second composite layer and the third composite layer;
s3: after weighing the three mixtures, pouring the three mixtures into a centrifugal machine from outside to inside in layers, and compacting and forming by adopting a centrifugal process;
s4: after standing for a set time after molding, steam heating maintenance is carried out;
s5: and (5) demolding and curing to obtain the hollow rod body.
7. The method for preparing an ultra-high performance concrete pole containing composite fiber according to claim 6, wherein the centrifugation process in step S3 comprises the following specific steps: rotating at a low speed of 1.4-1.8 g for 2-4 minutes; rotating for 4-6 minutes at a medium speed of 6.1-6.5 g; rotating at a high speed of 25-25.4 g for 4-6 minutes; rotating for 0.8-1.5 minutes at a medium speed of 6.1-6.5 g; and rotating at a low speed of 1.4-1.8 g for 0.8-1.5 minutes.
8. The method for preparing the ultra-high performance concrete pole containing the composite fiber according to claim 7, wherein the low-speed rotating speed is 80-100 r/min; the rotation speed of the medium speed is 170-190 r/min; the high-speed rotating speed is 350-370 r/min.
9. The preparation method of the ultra-high performance concrete pole containing the composite fiber according to claim 6, wherein the three mixtures in the step S3 are weighed according to the weight ratio of 7-11:13-17:34-38.
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| CN108327064A (en) * | 2018-02-07 | 2018-07-27 | 四川省川铁枕梁工程有限公司 | A kind of multiple field lightweight RPC electric poles and preparation method thereof |
| CN108360909A (en) * | 2018-02-07 | 2018-08-03 | 四川省川铁枕梁工程有限公司 | Axial distributed lightweight RPC electric poles of a kind of steel fibre and preparation method thereof |
| CN110116449A (en) * | 2018-02-07 | 2019-08-13 | 四川省川铁枕梁工程有限公司 | Durable electric pole of a kind of multisection type lightweight height and preparation method thereof |
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| CN115974493A (en) * | 2023-01-13 | 2023-04-18 | 中铁十五局集团有限公司 | Anti-freezing and anti-cracking high-performance concrete and preparation method thereof |
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