CN114620985A - High-performance concrete, ultrathin curved surface concrete permanent formwork component and assembled ultrathin curved surface concrete permanent formwork structure - Google Patents
High-performance concrete, ultrathin curved surface concrete permanent formwork component and assembled ultrathin curved surface concrete permanent formwork structure Download PDFInfo
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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
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- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- C04B2111/20—Resistance against chemical, physical or biological attack
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
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- E—FIXED CONSTRUCTIONS
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- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
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Abstract
The invention provides a high-performance concrete, ultrathin curved surface concrete permanent formwork component and an assembled ultrathin curved surface concrete permanent formwork structure, and relates to the technical field of highway engineering. The high-performance concrete provided by the invention comprises cement, quartz sand, silica fume, micro-bead powder, steel fiber, PVA fiber, a polycarboxylic acid high-efficiency water reducing agent, a defoaming agent and water; the micro-bead powder can reduce the viscosity of a concrete system, ensure the fluidity of the concrete under low water content, ensure that the concrete has higher compactness when a thin-wall curved surface is formed, ensure that a plate is not easy to crack and keep long-term integrity; the steel fiber and the PVA fiber are mixed, so that the toughness and the rigidity can be considered, and the ultrathin curved-surface plate is not easy to crack. According to the invention, through raw material selection and dosage control, the high-performance concrete can be made into the ultrathin curved surface concrete permanent formwork component, and the obtained ultrathin curved surface concrete permanent formwork component has good crack resistance and durability and can be used in high-altitude areas for a long time.
Description
Technical Field
The invention relates to the technical field of highway engineering, in particular to a high-performance concrete, ultrathin curved surface concrete permanent formwork component and an assembled ultrathin curved surface concrete permanent formwork structure.
Background
When concrete structures such as bridge pier columns (particularly high piers) are poured in regions with severe climatic environments such as Qinghai-Tibet plateau and the like, early dehydration is serious due to objective reasons such as dry plateau climate, large temperature difference, water resource shortage and the like, and macroscopic cracks or microcrack damage is generated on the surface of concrete; and the highway engineering concrete structure in the service process accelerates damage and damage due to frequent actions of long-term positive and negative temperature alternation, freeze-thaw cycle, wind corrosion and the like of the plateau, and the cracking of the exposed surface of the in-service concrete pier column in the plateau area is a common phenomenon and seriously affects the service life. The thinner the thickness of the concrete structure is, the more serious the damage phenomenon is. At present, in the qinghai-Tibet plateau area to the crackle on bridge pier stud surface, mainly adopt organic or inorganic material to carry out the maintenance of smearing on the surface, carry out the shutoff to the crack, but so not only increased artifical input and cost of maintenance, the outward appearance that the trace that produces also influences the pier stud is pleasing to the eye moreover in surface repair.
Disclosure of Invention
In view of the above, the present invention aims to provide a high performance concrete, an ultra-thin curved concrete permanent formwork member and an assembled ultra-thin curved concrete permanent formwork structure. The high-performance concrete provided by the invention can be prepared into an ultrathin curved surface concrete permanent formwork component, and the obtained ultrathin curved surface concrete permanent formwork component has good crack resistance and durability and can be used in high-altitude areas for a long time.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides high-performance concrete which comprises cement, quartz sand, silica fume, micro-bead powder, steel fiber, PVA fiber, a polycarboxylic acid high-efficiency water reducing agent, a defoaming agent and water;
in per cubic meter of high-performance concrete, the mass of cement is 600-800 kg, the mass of quartz sand is 1100-1300 kg, the mass of silica fume is 0-120 kg, the mass of micro bead powder is 150-300 kg, the mass of steel fiber is 15-45 kg, the mass of PVA fiber is 8-16 kg, the mass of water is 135-155 kg, the mass of the polycarboxylic acid high-efficiency water reducing agent is 1.0-2.0% of the sum of the mass of the cement, the silica fume and the micro bead powder, and the mass of the defoaming agent is 0.01-0.05% of the sum of the mass of the cement, the silica fume and the micro bead powder.
Preferably, the cement is ordinary portland cement with a strength grade of not less than P.O 42.5.5; the mass ratio of the sum of the mass of the cement, the silica fume and the micro-bead powder to the mass of the quartz sand is 1: 1-1.5.
Preferably, the quartz sand is continuous gradation with the particle size of 0.075-2.36 mm, and the content of silicon dioxide in the quartz sand is not lower than 90%; the silicon dioxide content in the silica fume is not lower than 95%.
Preferably, the micro-bead powder is fly ash with the content of regular spherical particles not less than 95%.
Preferably, the length of the steel fiber is 12mm, and the diameter of the steel fiber is 0.18-0.22 mm; the length of the PVA fiber is 6-8 mm, and the diameter of the PVA fiber is 0.040-0.045 mm.
Preferably, the fluidity of the high-performance concrete is 190-220 mm.
The invention provides an ultrathin curved surface concrete permanent template component which is prepared by the following steps:
placing concrete in a curved surface mould for high-frequency vibration to obtain an ultrathin curved surface forming blank;
curing the ultrathin curved surface molding blank, and then demolding to obtain an ultrathin curved surface concrete permanent template component;
the concrete is the high-performance concrete in the technical scheme; the wall thickness of the ultrathin curved surface concrete permanent formwork component is 20-30 mm.
Preferably, the frequency of the high-frequency vibration is 200-220 Hz; the curing temperature is 75-80 ℃, and the curing time is 24 hours.
Preferably, the curved surface mould is including relative first template and the second template that sets up and can dismantle the connection, first template with form the thin wall chamber that is used for shaping ultra-thin wall curved surface in the middle of the second template, through the shutoff board shutoff around the thin wall chamber, the both ends of shutoff board respectively with first template with the connection can be dismantled to the second template, first template with the relative one side periphery of second template is equipped with a plurality of recesses, and the homoenergetic is dismantled in each recess and is connected with a cylinder.
The invention also provides an assembled ultrathin curved surface concrete permanent template structure, which comprises a thin-wall main body, a splicing connecting part and a connecting piece; the thin-wall main body is formed by splicing a plurality of thin-wall units, and a sealing gasket is arranged at a joint formed by splicing; the inner side of the splicing end of each thin-wall unit is provided with the splicing connecting part, the thin-wall units and the splicing connecting parts are integrally formed members, and the integrally formed members are the ultrathin curved surface concrete permanent formwork members in the technical scheme; the connecting piece is used for connecting the splicing connecting parts on the two splicing ends in splicing connection.
Preferably, the thin-wall unit is an arc-shaped thin-wall unit, and a plurality of arc-shaped thin-wall units are spliced to form the annular thin-wall main body; the arc-shaped thin-wall unit comprises four splicing ends, a plurality of splicing connecting parts are arranged on the inner side of each splicing end, and each splicing connecting part is provided with a through hole; the connecting piece comprises a connecting bolt, and the connecting bolt penetrates through the corresponding two through holes in the splicing connecting parts to connect the two splicing connecting parts.
The invention provides high-performance concrete which comprises cement, quartz sand, silica fume, micro-bead powder, steel fiber, PVA fiber, a polycarboxylic acid high-efficiency water reducing agent, a defoaming agent and water. According to the invention, the micro-bead powder can reduce the viscosity of a concrete system, ensure the fluidity of the concrete under low water content, ensure that the concrete has higher compactness when a thin-wall curved surface is formed, ensure that a plate is not easy to crack and ensure the long-term integrity of the plate; the mixing of the steel fiber and the PVA fiber can give consideration to toughness and rigidity, so that the ultrathin curved-surface plate is not easy to crack. According to the invention, through the selection of raw materials and the control of the dosage, the high-performance concrete can be made into the ultrathin curved surface concrete permanent formwork component, and the obtained ultrathin curved surface concrete permanent formwork component has good crack resistance and durability.
The invention provides an ultrathin curved surface concrete permanent template component which can effectively reduce the installation and disassembly times of a traditional construction temporary template, greatly save manpower and protect life safety in high altitude anoxic areas; moreover, the water of capillary pores of newly poured concrete can be prevented from diffusing to the surrounding environment, a temperature buffer layer is formed on the surface of the concrete pier stud, the temperature alternating fluctuation amplitude of the core of the pier stud is reduced, the anti-cracking performance and the durability of the pier stud in high altitude areas are effectively improved, the later maintenance work is reduced, and the appearance quality of the pier stud is ensured; particularly, the high-strength steel has good anti-cracking performance and durability under the condition that the wall thickness is only 20-30 mm.
According to the assembled ultrathin curved surface concrete permanent formwork structure provided by the invention, the thin wall main body is formed by splicing a plurality of thin wall units, the requirement on physical ability of workers during construction is reduced, the installation and assembly of construction are facilitated, the assembled ultrathin curved surface concrete permanent formwork structure is more suitable for construction operation in a plateau anoxic environment, the sealing performance of the thin wall main body is ensured by arranging the sealing gasket at the joint, the leakage of internal slurry is avoided, the splicing connecting part is arranged at the inner side of the thin wall unit, after the assembly is finished, the outer wall of the thin wall main body has no convex structure, the appearance of a pier column is ensured to be attractive, the anti-cracking performance and the durability of the pier column are improved by the thin wall main body made of high-performance concrete, and the appearance quality of the pier column is effectively ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic perspective view of an assembled ultra-thin curved concrete permanent formwork structure according to the present invention;
FIG. 2 is a schematic view of the internal structure of the assembled ultra-thin curved concrete permanent formwork structure of FIG. 1;
FIG. 3 is a schematic perspective view of a thin-walled unit in the assembled ultra-thin curved concrete permanent formwork structure in FIG. 1;
in the figure: the concrete formwork comprises a 100-assembled ultrathin curved surface concrete permanent formwork structure, 1-thin-wall main bodies, 11-thin-wall units, 2-splicing connecting parts, 3-connecting pieces, 31-connecting bolts, 4-through holes and 5-sealing gaskets.
Detailed Description
The invention provides high-performance concrete which comprises cement, quartz sand, silica fume, micro-bead powder, steel fiber, PVA fiber, a polycarboxylic acid high-efficiency water reducing agent, a defoaming agent and water;
in per cubic meter of high-performance concrete, the mass of cement is 600-800 kg, the mass of quartz sand is 1100-1300 kg, the mass of silica fume is 0-120 kg, the mass of micro bead powder is 150-300 kg, the mass of steel fiber is 15-45 kg, the mass of PVA fiber is 8-16 kg, the mass of water is 135-155 kg, the mass of the polycarboxylic acid high-efficiency water reducing agent is 1.0-2.0% of the sum of the mass of the cement, the silica fume and the micro bead powder, and the mass of the defoaming agent is 0.01-0.05% of the sum of the mass of the cement, the silica fume and the micro bead powder.
In the present invention, the starting materials are all commercially available products well known to those skilled in the art unless otherwise specified.
The high-performance concrete provided by the invention comprises cement, wherein the mass of the cement in each cubic meter of the high-performance concrete is 600-800 kg, preferably 600-750 kg. In the present invention, the cement is preferably ordinary portland cement having a strength grade of not less than P.O 42.5.5.
The high-performance concrete provided by the invention comprises quartz sand, and the mass of the quartz sand in each cubic meter of the high-performance concrete is 1100-1300 kg, preferably 1150-1250 kg. In the invention, the quartz sand is preferably continuous grading with the particle size of 0.075-2.36 mm, and the content of silicon dioxide in the quartz sand is not lower than 90%.
The high-performance concrete provided by the invention comprises silica fume, wherein the mass of the silica fume in each cubic meter of the high-performance concrete is 0-120 kg, preferably 0-100 kg, and more preferably 50-100 kg. In the present invention, the silica content in the silica fume is preferably not less than 95%; the silica fume has the functions of improving the compactness and the mechanical property of the permanent template, improving the pore structure of concrete and reducing the communication porosity.
The high-performance concrete provided by the invention comprises micro-bead powder, wherein the mass of the micro-bead powder in each cubic meter of the high-performance concrete is 150-300 kg, preferably 150-250 kg; the mass ratio of the sum of the mass of the cement, the silica fume and the micro-bead powder to the mass of the quartz sand is preferably 1: 1-1.5. In the invention, the micro-bead powder is preferably high-quality fly ash with the content of regular spherical particles not less than 95 percent; the micro bead powder can reduce the viscosity of a concrete system, ensure the fluidity of the concrete under low water content, ensure the high compactness of the concrete during the forming of a thin-wall curved surface, ensure that a plate is not easy to crack and ensure the long-term integrity of the plate.
The high-performance concrete provided by the invention comprises steel fibers, wherein the mass of the steel fibers in each cubic meter of the high-performance concrete is 15-45 kg, and preferably 30-45 kg. In the invention, the length of the steel fiber is preferably 12mm, and the diameter of the steel fiber is preferably 0.18-0.22 mm; the steel fiber with the length and the diameter is beneficial to improving the stress uniform distribution of the ultrathin curved surface concrete and improving the crack resistance of the ultrathin curved surface concrete.
The high-performance concrete provided by the invention comprises PVA fibers (namely polyvinyl alcohol fibers), wherein the mass of the PVA fibers in each cubic meter of the high-performance concrete is 8-16 kg, and the preferred mass is 12-16 kg. In the invention, the length of the PVA fiber is preferably 6-8 mm, and the diameter is preferably 0.040-0.045 mm; the PVA fiber with the length and the diameter is beneficial to improving the stress uniform distribution of the ultrathin curved surface concrete and improving the crack resistance of the ultrathin curved surface concrete. In the invention, the mixing of the steel fiber and the PVA fiber can give consideration to toughness and rigidity, so that the ultrathin curved plate is not easy to crack.
The high-performance concrete provided by the invention comprises water, wherein the mass of the water in each cubic meter of the high-performance concrete is 135-155 kg, and preferably 150-155 kg. The water is not particularly required in the present invention, and water known to those skilled in the art may be used. The high-performance concrete provided by the invention has low water mixing amount, and the low water mixing amount is beneficial to improving the mechanical property of the ultrathin curved-surface thin plate.
The high-performance concrete provided by the invention comprises a polycarboxylic acid high-efficiency water reducing agent, wherein the mass of the polycarboxylic acid high-efficiency water reducing agent is 1.0-2.0% of the sum of the mass of cement, silica fume and micro-bead powder. The polycarboxylic acid high-efficiency water reducing agent has no special requirement, and can be prepared by adopting the polycarboxylic acid high-efficiency water reducing agent well known by the technical personnel in the field.
The high-performance concrete provided by the invention comprises an antifoaming agent, wherein the mass of the antifoaming agent is 0.01-0.05% of the sum of the mass of cement, silica fume and the mass of the micro-bead powder. The defoaming agent is not particularly required in the present invention, and a defoaming agent well known to those skilled in the art, specifically, a silicone-based defoaming agent, may be used.
In the invention, the fluidity of the high-performance concrete is preferably 190-220 mm. According to the invention, the fluidity of the high-performance concrete is controlled to be 190-220 mm, and the high-performance concrete can be further ensured to have higher compactness when a thin-wall curved surface is formed.
The invention has no special requirements on the preparation method of the high-performance concrete, and the cement, the quartz sand, the silica fume, the micro-bead powder, the steel fiber, the PVA fiber, the polycarboxylic acid high-efficiency water reducing agent, the defoaming agent and the water are uniformly mixed by adopting a method well known by a person skilled in the art.
According to the invention, through the selection of raw materials and the control of the dosage, the high-performance concrete can be made into the ultrathin curved surface concrete permanent formwork component, and the obtained ultrathin curved surface concrete permanent formwork component has good crack resistance and durability.
The invention provides an ultrathin curved surface concrete permanent template component which is prepared by the following steps:
placing concrete in a curved surface mould for high-frequency vibration to obtain an ultrathin curved surface forming blank;
curing the ultrathin curved surface forming blank, and then demolding to obtain an ultrathin curved surface concrete permanent template component;
the concrete is the high-performance concrete in the technical scheme; the wall thickness of the ultrathin curved surface concrete permanent formwork component is 20-30 mm.
In the invention, the curved surface mold is preferably a steel mold; the shape and size of the steel mould can be set according to the shape and size of the required concrete permanent formwork component, and the concrete component with an auxiliary structure (such as a connecting component) can be integrally formed. In the invention, the curved surface mold preferably comprises a first mold plate and a second mold plate which are oppositely arranged and can be detachably connected, a thin-wall cavity for forming the ultrathin-wall curved surface is formed between the first mold plate and the second mold plate, the periphery of the thin-wall cavity is sealed by a sealing plate, two ends of the sealing plate are detachably connected with the first mold plate and the second mold plate respectively, a plurality of grooves are formed in the periphery of one surface of the first mold plate opposite to the second mold plate, and a cylinder can be detachably connected in each groove. In the invention, the frequency of the high-frequency vibration is preferably 200-220 Hz; the high-frequency vibration is carried out for a time that no large air bubbles appear on the concrete surface layer after vibration; the high-frequency vibration is preferably carried out in a high-frequency vibrator. And forming a compact ultrathin curved surface by high-frequency vibration. In the invention, the curing temperature is preferably 75-80 ℃, and the curing time is preferably 24 h; and the maintenance is preferably carried out in a constant-temperature maintenance room, and the ultrathin curved-surface concrete permanent formwork member is obtained by demolding after the maintenance is finished. In the invention, the wall thickness of the ultrathin curved surface concrete permanent formwork component is 20-30 mm, and the ultrathin curved surface concrete permanent formwork component still has good crack resistance and durability under the condition that the wall thickness is only 20-30 mm.
The invention provides an assembled ultrathin curved surface concrete permanent template structure 100, which comprises a thin-wall main body 1, a splicing connecting part 2 and a connecting piece 3, wherein the thin-wall main body 1 is formed by splicing a plurality of thin-wall units 11, a sealing gasket 5 is arranged at a joint formed by splicing, the splicing connecting part 2 is arranged at the inner side of the splicing end of each thin-wall unit 11, the thin-wall units 11 and the splicing connecting parts 2 are integrally formed components, and the integrally formed components are ultrathin curved surface concrete permanent template components in the technical scheme; the connecting piece 3 is used for connecting the splicing connecting parts 2 on the two splicing ends of the splicing connection.
According to the invention, the thin-wall main body 1 is formed by splicing a plurality of thin-wall units 11, the requirement on physical ability of workers during construction is reduced, the installation and assembly of construction are convenient, the thin-wall units 11 can be set to be different sizes according to actual needs, the construction method is more suitable for construction operation in a plateau anoxic environment, the sealing gasket 5 is arranged at a joint, the sealing performance of the thin-wall main body 1 is ensured, the leakage of internal slurry is avoided, the splicing connecting part 2 is arranged at the inner side of the thin-wall units 11, after the assembly is finished, the outer wall of the thin-wall main body 1 is free of a protruding structure, the appearance attractiveness of a pier column is ensured, the anti-cracking performance and the durability of the pier column are improved by the thin-wall main body 1 made of high-performance concrete, and the appearance quality of the pier column is effectively ensured.
In the invention, the thin-wall unit 11 is an arc-shaped thin-wall unit, and a plurality of arc-shaped thin-wall units are spliced to form an annular thin-wall main body 1; the arc-shaped thin-wall unit comprises four splicing ends, a plurality of splicing connecting parts 2 are arranged on the inner side of each splicing end, and through holes 4 are formed in each splicing connecting part 2; the connecting piece 3 comprises a connecting bolt 31, and the connecting bolt 31 penetrates through the through holes 4 on the two corresponding splicing connecting parts 2 to connect the two splicing connecting parts 2. According to the size of the thin-wall unit 11, different numbers of splicing connecting parts 2 are arranged at each splicing end in an adaptable manner, specifically, in the invention, 2 splicing connecting parts 2 are respectively arranged at the top end and the bottom end of the thin-wall unit 11, 3 splicing connecting parts 2 are respectively arranged at two sides of the thin-wall unit 11, the splicing connecting parts 2 are trapezoidal connecting blocks and are integrally formed with the thin-wall unit 11, and through holes 4 are arranged in the middle of the trapezoidal connecting blocks, so that two splicing connecting parts 2 can be conveniently connected through connecting bolts 31.
The invention can adjust the shape of the thin-wall unit 11 according to the shape adaptability of the pier stud in actual construction, so that the thin-wall main body 1 formed by splicing the thin-wall units 11 is matched with the appearance of the pier stud.
The high performance concrete, ultra-thin curved concrete permanent formwork member and fabricated ultra-thin curved concrete permanent formwork structure provided by the present invention will be described with reference to the following examples, which should not be construed as limiting the scope of the present invention.
In each embodiment, the cement is ordinary portland cement with the strength grade not lower than P.O 42.5.5, the quartz sand is continuous gradation with the particle size of 0.075-2.36 mm, and the content of silicon dioxide is not lower than 90%; the silicon dioxide content of the silica fume is not lower than 95 percent; the micro-bead powder is fly ash with the content of regular spherical particles not less than 95 percent; the length of the steel fiber is 12mm, and the diameter of the steel fiber is 0.18-0.22 mm; the length of the PVA fiber is 6-8 mm, and the diameter of the PVA fiber is 0.040-0.045 mm; the defoaming agent is an organic silicon defoaming agent.
Example 1
A permanent template component of ultrathin curved surface concrete is prepared by the following steps:
uniformly mixing cement, quartz sand, silica fume, micro-bead powder, steel fiber, PVA fiber, a polycarboxylic acid high-efficiency water reducing agent, a defoaming agent and water to obtain high-performance concrete; in per cubic meter of high-performance concrete, 650kg of cement, 1250kg of quartz sand, 100kg of silica fume, 150kg of microbead powder, 45kg of steel fiber, 12kg of PVA fiber and 152kg of water, wherein the mass of the polycarboxylic acid high-efficiency water reducing agent is 2.0 percent of the sum of the mass of the cement, the mass of the silica fume and the mass of the microbead powder, and the mass of the defoaming agent is 0.05 percent of the sum of the mass of the cement, the silica fume and the microbead powder; the fluidity of the high-performance concrete is 190 mm;
placing the high-performance concrete in a curved surface mould to carry out high-frequency vibration, wherein the frequency of the high-frequency vibration is 200Hz, and obtaining a compact ultrathin curved surface forming blank; and (3) curing the ultrathin curved surface molding blank in a constant-temperature curing chamber at the temperature of 80 ℃ for 24h, and demolding after curing to obtain the ultrathin curved surface concrete permanent template component with the wall thickness of 30mm and the shape as shown in figure 3.
And assembling the prepared ultrathin curved surface concrete permanent template components into an assembled ultrathin curved surface concrete permanent template structure according to the modes of figures 1-2.
Example 2
A permanent template component of ultrathin curved surface concrete is prepared by the following steps:
uniformly mixing cement, quartz sand, silica fume, micro-bead powder, steel fiber, PVA fiber, a polycarboxylic acid high-efficiency water reducing agent, a defoaming agent and water to obtain high-performance concrete; in per cubic meter of high-performance concrete, 600kg of cement, 1250kg of quartz sand, 50kg of silica fume, 250kg of microbead powder, 45kg of steel fiber, 12kg of PVA fiber and 152kg of water, wherein the mass of the polycarboxylic acid high-efficiency water reducing agent is 2.0 percent of the sum of the mass of the cement, the mass of the silica fume and the mass of the microbead powder, and the mass of the defoaming agent is 0.05 percent of the sum of the mass of the cement, the silica fume and the microbead powder; the fluidity of the high-performance concrete is 200 mm;
placing the high-performance concrete in a curved surface mould to carry out high-frequency vibration, wherein the frequency of the high-frequency vibration is 200Hz, and obtaining a compact ultrathin curved surface forming blank; and (3) curing the ultrathin curved surface forming blank in a constant-temperature curing room at the temperature of 80 ℃ for 24 hours, and demolding after curing to obtain the ultrathin curved surface concrete permanent template component with the wall thickness of 30mm and the shape as shown in figure 3.
And assembling the prepared ultrathin curved surface concrete permanent template components into an assembled ultrathin curved surface concrete permanent template structure according to the modes of figures 1-2.
Example 3
A permanent template component of ultrathin curved surface concrete is prepared by the following steps:
uniformly mixing cement, quartz sand, silica fume, micro-bead powder, steel fiber, PVA fiber, a polycarboxylic acid high-efficiency water reducing agent, a defoaming agent and water to obtain high-performance concrete; in per cubic meter of high-performance concrete, 600kg of cement, 1250kg of quartz sand, 0kg of silica fume, 300kg of microbead powder, 45kg of steel fiber, 12kg of PVA fiber and 152kg of water, wherein the mass of the polycarboxylic acid high-efficiency water reducing agent is 2.0 percent of the sum of the mass of the cement, the mass of the silica fume and the mass of the microbead powder, and the mass of the defoaming agent is 0.05 percent of the sum of the mass of the cement, the silica fume and the microbead powder; the fluidity of the high-performance concrete is 220 mm;
placing the high-performance concrete in a curved surface mould to carry out high-frequency vibration, wherein the frequency of the high-frequency vibration is 200Hz, and obtaining a compact ultrathin curved surface forming blank body; and (3) curing the ultrathin curved surface molding blank in a constant-temperature curing chamber at the temperature of 80 ℃ for 24h, and demolding after curing to obtain the ultrathin curved surface concrete permanent template component with the thickness of 30mm and the shape as shown in figure 3.
And assembling the prepared ultrathin curved surface concrete permanent formwork member into an assembled ultrathin curved surface concrete permanent formwork structure according to the mode of figures 1-2.
Example 4
A permanent template component of ultrathin curved surface concrete is prepared by the following steps:
uniformly mixing cement, quartz sand, silica fume, micro-bead powder, steel fiber, PVA fiber, a polycarboxylic acid high-efficiency water reducing agent, a defoaming agent and water to obtain high-performance concrete; in per cubic meter of high-performance concrete, 650kg of cement, 1250kg of quartz sand, 100kg of silica fume, 150kg of microbead powder, 30kg of steel fiber, 16kg of PVA fiber and 155kg of water, wherein the mass of the polycarboxylic acid high-efficiency water reducing agent is 2.0 percent of the sum of the mass of the cement, the mass of the silica fume and the mass of the microbead powder, and the mass of the defoaming agent is 0.05 percent of the sum of the mass of the cement, the silica fume and the microbead powder; the fluidity of the high-performance concrete is 200 mm;
placing the high-performance concrete in a curved surface mould to carry out high-frequency vibration, wherein the frequency of the high-frequency vibration is 200Hz, and obtaining a compact ultrathin curved surface forming blank; and (3) curing the ultrathin curved surface molding blank in a constant-temperature curing chamber at the temperature of 80 ℃ for 24h, and demolding after curing to obtain the ultrathin curved surface concrete permanent template component with the thickness of 30mm and the shape as shown in figure 3.
And assembling the prepared ultrathin curved surface concrete permanent formwork member into an assembled ultrathin curved surface concrete permanent formwork structure according to the modes of figures 1-2.
The quality of the ultrathin curved-surface concrete permanent template member of the embodiment 1-4 is detected, including the performance detection of the compressive strength, the flexural strength, the electric flux, the frost resistance grade, the sulfuric acid corrosion resistance grade and the like, and the detection results are listed in table 1:
TABLE 1 PERMANENT MOULD MEMBER PROPERTIES FOR ULTRA-THIN CURVED CONCRETE OF EXAMPLES 1-4
The embodiment shows that the high-performance concrete provided by the invention can be made into an ultrathin curved surface concrete permanent formwork component, and the obtained ultrathin curved surface concrete permanent formwork component (with the thickness of 20-30 mm) has good crack resistance and durability, so that the ultrathin curved surface concrete permanent formwork component can be used in high-altitude areas for a long time.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The high-performance concrete is characterized by comprising cement, quartz sand, silica fume, micro-bead powder, steel fiber, PVA fiber, a polycarboxylic acid high-efficiency water reducing agent, a defoaming agent and water;
in per cubic meter of high-performance concrete, the mass of cement is 600-800 kg, the mass of quartz sand is 1100-1300 kg, the mass of silica fume is 0-120 kg, the mass of micro bead powder is 150-300 kg, the mass of steel fiber is 15-45 kg, the mass of PVA fiber is 8-16 kg, the mass of water is 135-155 kg, the mass of the polycarboxylic acid high-efficiency water reducing agent is 1.0-2.0% of the sum of the mass of the cement, the silica fume and the micro bead powder, and the mass of the defoaming agent is 0.01-0.05% of the sum of the mass of the cement, the silica fume and the micro bead powder.
2. The high performance concrete of claim 1, wherein the cement is ordinary portland cement having a strength grade of not less than P.O 42.5.5; the mass ratio of the sum of the mass of the cement, the silica fume and the micro-bead powder to the mass of the quartz sand is 1: 1-1.5.
3. The high-performance concrete according to claim 1 or 2, wherein the quartz sand is a continuous grading with the particle size of 0.075-2.36 mm, and the content of silica in the quartz sand is not lower than 90%; the silicon dioxide content in the silica fume is not lower than 95%.
4. The high-performance concrete of claim 1, wherein the micro-bead powder is fly ash with a content of regular spherical particles of not less than 95 wt%; the length of the steel fiber is 12mm, and the diameter of the steel fiber is 0.18-0.22 mm; the length of the PVA fiber is 6-8 mm, and the diameter of the PVA fiber is 0.040-0.045 mm.
5. The high-performance concrete according to claim 1, wherein the fluidity of the high-performance concrete is 190-220 mm.
6. An ultra-thin curved concrete permanent formwork member, characterized in that it is prepared by a method comprising the following steps:
placing concrete in a curved surface mould for high-frequency vibration to obtain an ultrathin curved surface forming blank;
curing the ultrathin curved surface molding blank, and then demolding to obtain an ultrathin curved surface concrete permanent template component;
the concrete is the high-performance concrete as claimed in any one of claims 1 to 6; the wall thickness of the ultrathin curved surface concrete permanent formwork component is 20-30 mm.
7. The permanent formwork member for ultra-thin curved concrete according to claim 6, wherein the frequency of the high frequency vibration is 200 to 220 Hz; the curing temperature is 75-80 ℃, and the curing time is 24 hours.
8. The permanent formwork component for ultra-thin curved concrete according to claim 6 or 7, wherein the curved formwork comprises a first formwork and a second formwork which are oppositely arranged and can be detachably connected, a thin-wall cavity for forming the ultra-thin curved wall is formed between the first formwork and the second formwork, the periphery of the thin-wall cavity is sealed by a sealing plate, two ends of the sealing plate are detachably connected with the first formwork and the second formwork respectively, a plurality of grooves are arranged on the periphery of one surface of the first formwork opposite to the second formwork, and a cylinder can be detachably connected in each groove.
9. An assembled ultrathin curved-surface concrete permanent formwork structure is characterized by comprising a thin-wall main body, a splicing connecting part and a connecting piece; the thin-wall main body is formed by splicing a plurality of thin-wall units, and a sealing gasket is arranged at a joint formed by splicing; the inner side of the splicing end of each thin-wall unit is provided with the splicing connecting part, the thin-wall units and the splicing connecting parts are integrally formed members, and the integrally formed members are the ultrathin curved surface concrete permanent formwork members according to claim 8; the connecting piece is used for connecting the splicing connecting parts on the two splicing ends in splicing connection.
10. The assembled ultra-thin curved concrete permanent formwork structure of claim 9, wherein the thin-walled units are arc-shaped thin-walled units, and a plurality of the arc-shaped thin-walled units are spliced to form the annular thin-walled main body; the arc-shaped thin-wall unit comprises four splicing ends, a plurality of splicing connecting parts are arranged on the inner side of each splicing end, and each splicing connecting part is provided with a through hole; the connecting piece comprises a connecting bolt, and the connecting bolt penetrates through the corresponding two through holes in the splicing connecting parts to connect the two splicing connecting parts.
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