CN114988839A - Non-autoclaved PHC tubular pile concrete and PHC tubular pile - Google Patents
Non-autoclaved PHC tubular pile concrete and PHC tubular pile Download PDFInfo
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- CN114988839A CN114988839A CN202210586329.5A CN202210586329A CN114988839A CN 114988839 A CN114988839 A CN 114988839A CN 202210586329 A CN202210586329 A CN 202210586329A CN 114988839 A CN114988839 A CN 114988839A
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/16—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 calcium sulfate cements containing anhydrite, e.g. Keene's cement
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2015—Sulfate resistance
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/56—Compositions suited for fabrication of pipes, e.g. by centrifugal casting, or for coating concrete pipes
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical Kinetics & Catalysis (AREA)
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The application relates to the field of tubular pile production, and particularly discloses a steam-free PHC tubular pile concrete and a PHC tubular pile, which comprise the following components in parts by weight: 250-360 parts of cement, 900-1100 parts of coarse aggregate, 460-550 parts of fine aggregate, 4-7 parts of a water reducing agent, 100-150 parts of water, 30-85 parts of fly ash, 50-100 parts of granulated blast furnace slag powder, 30-40 parts of an expanding agent, 8-13 parts of anhydrous gypsum, 1-5 parts of an early strength agent and 300-350 parts of modified copper tailings; the preparation method of the modified copper tailings comprises the following steps: soaking the copper tailings in the modified solution, taking out and drying to obtain modified copper tailings; the modified solution comprises the following components in a weight ratio of 1: (0.7-0.8): (0.5-0.6) an organic solvent, hexadecylamine and an acrylic resin. The PHC tubular pile is prepared from PHC tubular pile concrete, and the preparation of the PHC tubular pile comprises a natural curing step. The current situation that the sand supply is not enough is alleviated, and the utilization rate of the copper tailings is improved.
Description
Technical Field
The application relates to the field of tubular pile production, more specifically, it relates to exempt from to press and evaporate PHC tubular pile concrete and PHC tubular pile.
Background
The PHC pipe pile is a prestressed high-strength concrete pipe pile, which is a common concrete prefabricated part in a building foundation. The main raw material for manufacturing the tubular pile is concrete, and the concrete is formed by cementing granular aggregate by a cementing material. The conventional PHC tubular pile can achieve specified strength under the normal-temperature natural curing state by selecting the pressure-steaming-free PHC tubular pile concrete, so that the energy consumption during steam curing of the PHC tubular pile is reduced, and the production efficiency is improved.
At present, natural sand is usually adopted as fine aggregate in the non-autoclaved PHC tubular pile concrete, but the long-term exploitation of the natural sand causes the resource of the natural sand to be gradually exhausted, and the natural sand has the current situation of insufficient supply.
Disclosure of Invention
In order to alleviate the current situation that natural sand supply is not enough, this application provides exempt from to press and evaporates PHC tubular pile concrete and PHC tubular pile.
The application provides a pressure steam-free PHC tubular pile concrete and PHC tubular pile adopt following technical scheme:
first aspect, this application provides exempts from to press and evaporates PHC tubular pile concrete adopts following technical scheme:
the pressure-steaming-free PHC pipe pile concrete comprises the following components in parts by weight: 250-360 parts of cement, 900-1100 parts of coarse aggregate, 460-550 parts of fine aggregate, 4-7 parts of a water reducing agent, 100-150 parts of water, 30-85 parts of fly ash, 50-100 parts of granulated blast furnace slag powder, 30-40 parts of an expanding agent, 8-13 parts of anhydrous gypsum, 1-5 parts of an early strength agent and 300-350 parts of modified copper tailings;
the preparation method of the modified copper tailings comprises the following steps: soaking the copper tailings in the modified solution, taking out and drying to obtain modified copper tailings; the modified solution comprises the following components in percentage by weight (0.7-0.8): 1: (0.5-0.6) hexadecylamine, an organic solvent and acrylic resin.
The copper tailings are fine powder sand grain components left after copper ores are subjected to sorting operations such as crushing, grinding and the like, at present, the resource utilization rate of the copper tailings is low, and the copper tailings which are piled but not comprehensively utilized are easy to cause environmental pollution due to high heavy metal content. This application chooses for use the copper tailing to replace partial sand to add to exempting from to press and evaporate PHC tubular pile concrete in, has solved the not enough problem of sand supply to the utilization ratio of copper tailing has been improved.
In the experimental process, the corrosion resistance of the PHC tubular pile prepared by non-autoclaved PHC tubular pile concrete can be reduced by simply adding the copper tailings to replace part of sand, and the reason for analyzing the corrosion resistance is that the metal content in the PHC tubular pile is increased and the possibility of corrosion of the PHC tubular pile is increased due to the addition of the copper tailings.
In order to improve the phenomenon that the corrosion resistance of a PHC pipe pile finished product is reduced due to the addition of copper tailings, the copper tailings are modified by using a modification solution. Experiments show that the corrosion resistance of the PHC tubular pile can be improved to the level of the conventional PHC tubular pile by adopting hexadecylamine to wrap the copper tailings, and the analysis probably results in that hexadecylamine molecules contain two polar groups with opposite properties, and can be adsorbed on the metal surface to form a molecular film so as to reduce the corrosion reaction of metal caused by the diffusion of corrosive substances to the metal surface, and the hexadecylamine is solid particles and is easily dissolved in an organic solvent, so that the hexadecylamine can be wrapped on the surface of the copper tailings particles by dissolving the hexadecylamine in the organic solvent, and the corrosion effect of the hexadecylamine on the copper tailings is improved.
In the experimental process, the corrosion resistance of the PHC pipe pile is not obviously improved only by coating the copper tailings with hexadecylamine. The corrosion resistance of the PHC tubular pile can be raised back to the level of the conventional PHC tubular pile by adding the acrylic resin, and modifying the copper tailings together with the hexadecylamine and the organic solvent.
Optionally, the modified solution further comprises sodium bromoethyl sulfonate, hexadecylamine, an organic solvent and acrylic resin, wherein the weight ratio of the organic solvent to the acrylic resin in the modified solution is (0.9-1): (0.7-0.8): 1: (0.5-0.6).
In the experimental process, the mechanical property of the PHC tubular pile obtained by adopting the modified copper tailings is influenced and can be specifically shown as the reduction of the compressive strength, and the analysis reason is that the mechanical property of the PHC tubular pile is reduced due to the addition of the modified solution. According to the method, the bromoethyl sodium sulfonate, the hexadecylamine, the organic solvent and the acrylic resin are selected to prepare the modified solution together, so that the mechanical property of the PHC tubular pile can be improved to a level close to that of the conventional PHC tubular pile. The reason for analyzing the method may be that the sodium bromoethyl sulfonate can simultaneously improve the dispersibility of the modification solution in the autoclaving-free PHC tubular pile concrete, and meanwhile, the modification solution coated on the surface of the copper tailings is damaged in a controllable range, so that the coupling strength of the interface of the copper tailings is enhanced by the modification solution.
Optionally, the viscosity of the acrylic resin is 1000-3000 mpa.s.
By adopting the technical scheme, the acrylic resin with the viscosity ranging from 1000-3000 mpa.s is selected, the stability of the copper tailings coated with the modified solution is optimal, and the modification effect of the modified solution on the copper tailings can be improved.
Optionally, the organic solvent is acetone, and the mass fraction of the acetone is more than or equal to 98.5%.
By adopting the technical scheme, the hexadecylamine is dissolved by the acetone, so that the hexadecylamine is favorable for coating the surfaces of copper tailing particles, the corrosion phenomenon of the copper tailing is reduced, and the corrosion resistance of the PHC tubular pile is improved. Acetone with the mass fraction of more than or equal to 98.5% is selected, so that the hexadecylamine is dissolved by the acetone to a high degree, and the effect is good.
Optionally, the particle size of the copper tailings is 0.15-1 mm, the copper tailings are continuously graded, and the specific surface area is 190-330 m 2 /kg。
By adopting the technical scheme, the particle size of the copper tailings is 0.15-1 mm, and the copper tailings can be continuously graded, so that the copper tailings can be filled into gaps of fine aggregates to a greater extent, the rationality of a solid particle distribution structure in the pressure-steaming-free PHC tubular pile concrete is improved, and the compressive strength of the PHC tubular pile is further improved.
Optionally, the early strength agent is triethanolamine.
By adopting the technical scheme, the triethanolamine mixing amount is small, the side effect is small, the early strength effect is obvious, and the later strength of the PHC tubular pile can be improved to a certain degree.
In a second aspect, the application provides a PHC tubular pile prepared by the above-mentioned pressure steaming-free PHC tubular pile concrete, adopts following technical scheme:
the manufacture of the PHC tubular pile comprises the following natural maintenance steps:
the temperature of natural curing is 18-22 ℃, and the humidity is more than or equal to 95 ℃.
By adopting the technical scheme, the PHC tubular pile is not easy to dry shrink and crack in the maintenance process, so that the compressive strength of the PHC tubular pile is ensured.
Optionally, the manufacturing of the PHC tubular pile further comprises the following steps:
the manufacturing steps before natural curing are as follows:
preparing modified copper tailings: mixing the preparation raw materials in the modified solution in proportion to obtain a modified solution, soaking the copper tailings in the modified solution, taking out the copper tailings and drying the copper tailings;
non-autoclaved PHC pipe pile concrete mixing: mixing and stirring all the components of the weighed non-autoclaved PHC pipe pile concrete to prepare a non-autoclaved PHC pipe pile concrete mixture;
avoid pressing and evaporate PHC tubular pile concrete cloth: pouring the pressure-steaming-free PHC pipe pile concrete mixture into a pipe pile mould;
applying prestress: tensioning the tubular pile by using a tensioning machine;
centrifugal molding: and (3) placing the pipe pile mould filled with the non-autoclaved PHC pipe pile concrete on a pipe pile centrifuge for high-speed centrifugation, and pouring out the residual slurry to obtain the centrifugally formed PHC pipe pile.
By adopting the technical scheme, the PHC tubular pile meeting the requirement of compressive strength can be prepared.
In summary, the present application has the following beneficial effects:
1. according to the method, the copper tailings are modified by the modifying solution, and the modified copper tailings are added to the non-autoclaved PHC tubular pile concrete instead of part of fine aggregate, so that on one hand, the problem of insufficient supply of sand as the fine aggregate is relieved, and the utilization rate of the waste copper tailings is improved, and on the other hand, the corrosion resistance of the PHC tubular pile is reduced when the copper tailings are directly used for replacing the sand;
2. the sodium bromoethyl sulfonate, the hexadecylamine, the organic solvent and the acrylic resin are jointly used for preparing the modified solution, so that the influence of the modified solution on the compressive strength of the PHC tubular pile can be reduced, and the mechanical property of the PHC tubular pile is increased to a level close to that of the conventional PHC tubular pile.
3. The PHC tubular pile prepared from the PHC tubular pile concrete can still reach the corrosion resistance level of the existing PHC tubular pile after partial sand is replaced by copper tailings.
Detailed Description
The present application is described in further detail below.
Introduction of raw materials
TABLE 1 preparation of autoclave-free PHC tubular pile concrete
Examples
Example 1:
the pressure-steaming-free PHC pipe pile concrete comprises 250kg of early strength portland cement, 1100kg of coarse aggregate, 460kg of fine aggregate, 7kg of high-performance water reducing agent, 100kg of water, 85kg of fly ash, 50kg of granulated blast furnace slag powder, 40kg of expanding agent, 8kg of anhydrous gypsum, 5kg of triethanolamine and 300kg of modified copper tailings; wherein the modified solution comprises the following components in a weight ratio of 1: 0.8: 0.5 of acetone, hexadecylamine and acrylic resin.
The autoclave-free PHC tubular pile concrete and the preparation method of the PHC tubular pile comprise the following steps:
preparing modified copper tailings: mixing acetone, hexadecylamine and acrylic resin in proportion to obtain a modified solution, soaking the copper tailings in the modified solution, and drying at normal temperature to obtain modified copper tailings;
non-autoclaved PHC pipe pile concrete mixing: mixing and stirring all the components of the weighed non-autoclaved PHC pipe pile concrete to prepare a non-autoclaved PHC pipe pile concrete mixture;
avoid autoclaving PHC tubular pile concrete cloth: pouring the pressure-steaming-free PHC pipe pile concrete mixture into a pipe pile mould;
applying prestress: tensioning the tubular pile by using a tensioning machine;
centrifugal molding: placing the pipe pile mould filled with the non-autoclaved PHC pipe pile concrete on a pipe pile centrifuge for high-speed centrifugation, and pouring out residual slurry to obtain the centrifugally formed PHC pipe pile;
and (4) natural maintenance: the temperature of natural curing is 22 ℃, and the humidity is 95 ℃.
Example 2:
the pressure-steaming-free PHC pipe pile concrete comprises 360kg of early strength portland cement, 900kg of coarse aggregate, 550kg of fine aggregate, 4kg of high-performance water reducing agent, 150kg of water, 30kg of fly ash, 100kg of granulated blast furnace slag powder, 30kg of expanding agent, 13kg of anhydrous gypsum, 1kg of triethanolamine and 350kg of modified copper tailings; wherein the modified solution comprises the following components in a weight ratio of 1: 0.7: 0.6 of acetone, hexadecylamine and acrylic resin.
The autoclave-free PHC tubular pile concrete and the preparation method of the PHC tubular pile comprise the following steps:
preparing modified copper tailings: mixing acetone, hexadecylamine and acrylic resin in proportion to obtain a modified solution, soaking the copper tailings in the modified solution, and drying at normal temperature to obtain modified copper tailings;
non-autoclaved PHC pipe pile concrete mixing: mixing and stirring the weighed components of the non-autoclaved PHC pipe pile concrete to prepare a non-autoclaved PHC pipe pile concrete mixture;
avoid pressing and evaporate PHC tubular pile concrete cloth: pouring the pressure-steaming-free PHC pipe pile concrete mixture into a pipe pile mould;
applying prestress: tensioning the tubular pile by using a tensioning machine;
centrifugal molding: placing the pipe pile mould filled with the non-autoclaved PHC pipe pile concrete on a pipe pile centrifuge for high-speed centrifugation, and pouring out residual slurry to obtain the centrifugally formed PHC pipe pile;
and (4) natural maintenance: the temperature for natural curing is 22 ℃ and the humidity is 95 ℃.
Example 3:
the pressure-steaming-free PHC pipe pile concrete comprises 300kg of early strength portland cement, 1050kg of coarse aggregate, 500kg of fine aggregate, 5kg of high-performance water reducing agent, 135kg of water, 64kg of fly ash, 72kg of granulated blast furnace slag powder, 33kg of expanding agent, 9kg of anhydrous gypsum, 4kg of triethanolamine and 340kg of modified copper tailings; wherein the modified solution comprises the following components in a weight ratio of 1: 0.75: 0.52 acetone, hexadecylamine, and acrylic resin.
The autoclave-free PHC tubular pile concrete and the preparation method of the PHC tubular pile comprise the following steps:
preparing modified copper tailings: mixing acetone, hexadecylamine and acrylic resin in proportion to obtain a modified solution, soaking the copper tailings in the modified solution, and drying at normal temperature to obtain modified copper tailings;
non-autoclaved PHC pipe pile concrete mixing: mixing and stirring the weighed components of the non-autoclaved PHC pipe pile concrete to prepare a non-autoclaved PHC pipe pile concrete mixture;
avoid pressing and evaporate PHC tubular pile concrete cloth: pouring the pressure-steaming-free PHC pipe pile concrete mixture into a pipe pile mould;
applying prestress: tensioning the tubular pile by using a tensioning machine;
centrifugal molding: placing the pipe pile mould filled with the non-autoclaved PHC pipe pile concrete on a pipe pile centrifuge for high-speed centrifugation, and pouring out residual slurry to obtain the centrifugally formed PHC pipe pile;
and (4) natural maintenance: the temperature of natural curing is 22 ℃, and the humidity is 95 ℃.
Example 4:
example 4 differs from example 3 in that the modification solution further includes sodium bromoethyl sulfonate, acetone, sodium bromoethyl sulfonate, hexadecylamine, and acrylic resin in a weight ratio of 1: 0.9: 0.75: 0.52.
example 5:
example 5 is different from example 3 in that the modification solution further includes sodium bromoethyl sulfonate, acetone, sodium bromoethyl sulfonate, hexadecylamine and acrylic resin in a weight ratio of 1: 0.94: 0.75: 0.52.
example 6:
example 6 differs from example 3 in that the modification solution further includes sodium bromoethyl sulfonate, acetone, sodium bromoethyl sulfonate, hexadecylamine, and acrylic resin in a weight ratio of 1: 1: 0.75: 0.52.
comparative example
Comparative example 1:
comparative example 1 differs from example 3 in that: the same amount of natural sand is used for replacing the modified copper tailings.
Comparative example 2:
comparative example 2 differs from example 3 in that: the copper tailings are not treated by a modification solution.
Comparative example 3
Comparative example 3 differs from example 3 in that: no acrylic resin was added to the modified solution.
Performance detection
The PHC piles prepared in examples 1 to 6 and comparative examples 1 to 3 were subjected to a corrosion resistance test and a 3d, 28d compressive strength (MPa) test.
TABLE 2 Corrosion resistance test results of PHC tubular piles prepared in examples 1-6 and comparative examples 1-3
TABLE 3 compressive Strength test results of PHC tubular piles prepared in examples 1-6 and comparative examples 1-3
According to the test data recorded in table 2, as can be seen from comparative example 1 and examples 1 to 3, the autoclave-free PHC tubular pile concrete prepared by the method reaches the level that the PHC tubular pile reaches the corrosion resistance of the existing PHC tubular pile, and the modified copper tailings can be used for replacing part of natural sand to be added into the autoclave-free PHC tubular pile concrete, so that the problem of insufficient sand supply is solved, and the utilization rate of the copper tailings is improved.
As can be seen from comparative example 2 and examples 1 to 3, the corrosion resistance of the PHC tubular pile prepared by non-autoclaving PHC tubular pile concrete is reduced by simply adding the copper tailings instead of part of the natural sand, and the reason for analyzing the corrosion resistance may be that the metal content in the PHC tubular pile is increased by adding the copper tailings, and the possibility of corrosion of the PHC tubular pile is increased. After the copper tailings are modified by the modifying solution, the corrosion resistance of the PHC pipe pile is improved, and the reason for analyzing the corrosion resistance is that hexadecylamine can be adsorbed on the surface of copper tailing particles to form a molecular film after being dissolved by acetone, so that the corrosion reaction of metal caused by the diffusion of corrosive substances to the metal surface is reduced.
It can be seen from comparative example 3 and examples 1 to 3 that the corrosion resistance of the PHC tubular pile is not significantly improved only by coating the copper tailings with hexadecylamine, and the corrosion resistance of the PHC tubular pile is further improved after the acrylic resin is added, and the reason for analyzing the improvement may be that the acrylic resin enhances the adhesion of hexadecylamine and acetone on the surface of the copper tailings particles, so that the hexadecylamine can more stably wrap the copper tailings, thereby improving the corrosion resistance of the PHC tubular pile.
According to the test data recorded in table 3, it can be seen from examples 3 to 6 and comparative example 1 that the compressive strength of the PHC pile can be increased to a level close to that of the existing PHC pile after adding the sodium bromoethyl sulfonate into the modification solution. The reason for analyzing the method is probably that the sodium bromoethyl sulfonate can simultaneously improve the dispersibility of the modified solution in the non-autoclaved PHC tubular pile concrete, and meanwhile, the modified solution coated on the surface of the copper tailings is damaged in a controllable range, so that the interface bonding strength of the copper tailings is enhanced by the modified solution.
The embodiments of the present invention are preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, wherein like parts are denoted by like reference numerals. Therefore, the method comprises the following steps: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The autoclave-free PHC pipe pile concrete is characterized by comprising the following components in parts by weight: 250-360 parts of cement, 900-1100 parts of coarse aggregate, 460-550 parts of fine aggregate, 4-7 parts of a water reducing agent, 100-150 parts of water, 30-85 parts of fly ash, 50-100 parts of granulated blast furnace slag powder, 30-40 parts of an expanding agent, 8-13 parts of anhydrous gypsum, 1-5 parts of an early strength agent and 300-350 parts of modified copper tailings;
the preparation method of the modified copper tailings comprises the following steps: soaking the copper tailings in the modified solution, taking out and drying to obtain modified copper tailings; the modified solution comprises the following components in a weight ratio of 1: (0.7-0.8): (0.5-0.6) an organic solvent, hexadecylamine and an acrylic resin.
2. The non-autoclaved PHC pipe pile concrete according to claim 1, wherein: the modified solution also comprises sodium bromoethyl sulfonate, and the weight ratio of the organic solvent, the sodium bromoethyl sulfonate, the hexadecylamine and the acrylic resin in the modified solution is 1: (0.9-1): (0.7-0.8): (0.5-0.6).
3. The non-autoclaved PHC pipe pile concrete according to claim 1, wherein: the viscosity of the acrylic resin is 1000-3000 mpa.s.
4. The non-autoclaved PHC pipe pile concrete according to claim 1, wherein: the organic solvent is acetone, and the mass fraction of the acetone is more than or equal to 98.5%.
5. The non-autoclaved PHC pipe pile concrete according to claim 1, wherein: the particle size of the copper tailings is 0.15-1 mm, continuous grading is performed, and the specific surface area is 190-330 m 2/kg.
6. The non-autoclaved PHC pipe pile concrete according to claim 1, wherein: the early strength agent adopts triethanolamine.
7. The PHC tubular pile prepared from the autoclaving-free PHC tubular pile concrete as set forth in any one of claims 1 to 6, wherein the manufacture of the PHC tubular pile comprises the natural curing step:
the temperature of natural curing is 18-22 ℃, and the humidity is more than or equal to 95 ℃.
8. The PHC pile of claim 7, wherein: the manufacture of the PHC tubular pile further comprises the following steps:
the manufacturing steps before natural curing are as follows:
preparing modified copper tailings: mixing the preparation raw materials in the modified solution in proportion to obtain a modified solution, soaking the copper tailings in the modified solution, taking out the copper tailings and drying the copper tailings;
non-autoclaved PHC pipe pile concrete mixing: mixing and stirring the weighed components of the non-autoclaved PHC pipe pile concrete to prepare a non-autoclaved PHC pipe pile concrete mixture;
avoid autoclaving PHC tubular pile concrete cloth: pouring the pressure-steaming-free PHC pipe pile concrete mixture into a pipe pile mould;
applying prestress: tensioning the tubular pile by using a tensioning machine;
centrifugal molding: and (3) placing the pipe pile mould filled with the autoclaving-free PHC pipe pile concrete on a pipe pile centrifuge for high-speed centrifugation, and pouring out residual slurry to obtain the centrifugally formed PHC pipe pile.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115893967A (en) * | 2022-12-01 | 2023-04-04 | 四川华西绿舍建材有限公司 | Low-carbon type multi-element composite early-strength steam-curing-free concrete prefabricated part and preparation method thereof |
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| CN115893967A (en) * | 2022-12-01 | 2023-04-04 | 四川华西绿舍建材有限公司 | Low-carbon type multi-element composite early-strength steam-curing-free concrete prefabricated part and preparation method thereof |
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