CN109400029B - Method for processing cement pipe pile by using carbon fiber and recycled concrete - Google Patents

Method for processing cement pipe pile by using carbon fiber and recycled concrete Download PDF

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CN109400029B
CN109400029B CN201811401018.7A CN201811401018A CN109400029B CN 109400029 B CN109400029 B CN 109400029B CN 201811401018 A CN201811401018 A CN 201811401018A CN 109400029 B CN109400029 B CN 109400029B
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powder
cement
concrete
putting
pile
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CN109400029A (en
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刘闯
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Laifeng Sanzhong Building Materials Co ltd
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Laifeng Sanzhong Building Materials Co ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
    • B28B21/10—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means
    • B28B21/22—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using rotatable mould or core parts
    • B28B21/30—Centrifugal moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
    • B28B21/60—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements
    • B28B21/62—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements circumferential laterally tensioned
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
    • 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
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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
    • C04B2111/34—Non-shrinking or non-cracking materials
    • C04B2111/343—Crack resistant materials
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a method for processing a cement pipe pile by utilizing carbon fibers and recycled concrete, which comprises the steps of firstly preparing the recycled concrete, crushing the waste concrete, and sieving the crushed waste concrete by a 38 mu m sieve to obtain waste concrete powder; mixing zeolite powder and waste concrete powder, and putting the mixture into a ball mill for ball milling to obtain first mixed powder, wherein the ball milling time is 2 hours; adding the first mixed powder into a sodium hydroxide solution, carrying out hydrothermal treatment for 1 day at the hydrothermal temperature of 30 ℃, and filtering by using a 200-mesh screen to obtain second mixed powder; the concentration of the sodium hydroxide solution is 1 mol/L. The invention provides a method for processing a cement pipe pile by using carbon fibers and recycled concrete, which controls reasonable proportioning components, so that the prepared cement pipe pile has better mechanical property, and meanwhile, the waste concrete is used as a base material for preparation, so that the cost is saved, and the economic effect is higher.

Description

Method for processing cement pipe pile by using carbon fiber and recycled concrete
Technical Field
The invention relates to the field of pipe pile manufacturing, in particular to a method for processing a cement pipe pile by using carbon fibers and recycled concrete.
Background
The pipe piles are classified into post-tensioned prestressed pipe piles, pre-tensioned prestressed pipe piles, prestressed concrete pipe piles (PC pipe piles), prestressed concrete thin-wall pipe piles (PTC pipe piles) and high-strength prestressed concrete pipe piles (PHC pipe piles), and most of the pipe piles are manufactured by preparing concrete with cement in the market today.
The cement may be used to prepare concrete and concrete for a wide variety of applications including, but not limited to, roads, parking lots, bridges, walkways, and support structures. Along with the acceleration of urbanization progress in China and the increasing progress of science and technology, the construction industry enters a high-speed development stage, and along with the increase of construction waste, most of which are waste concrete, the environment pollution and the great inconvenience are brought to our lives.
In view of the above circumstances, a method for processing a cement pipe pile by using carbon fibers and recycled concrete is needed to be designed, which not only needs to solve the problem of secondary utilization of waste concrete, but also needs to save cost and reduce the chloride ion permeability of the pipe pile, and thus, a problem to be solved urgently is needed.
Disclosure of Invention
The invention aims to provide a method for processing a cement pipe pile by using carbon fibers and recycled concrete, which aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for processing a cement pipe pile by utilizing carbon fibers and recycled concrete comprises the following raw material components: by weight, 800 parts of cement composition 400-.
Preferably, the raw material components are as follows: the cement composite comprises, by weight, 550 parts of cement composite, 1300 parts of aggregate, 1350 parts of water, 200 parts of water, 20-35 parts of water reducing agent, 250 parts of fiber composite and 25-50 parts of curing agent.
Preferably, the cement composition comprises the following raw material components: by mass percentage, 10-20% of solvent, 40-55% of recycled concrete, 20-35% of volcanic ash cement, 0.05-0.5% of sugar, 25-50% of pumice, 0.5-1.5% of silica fume, 0.2-1% of aluminum hydroxide and 0.6-1.2% of fly ash.
Preferably, the recycled concrete comprises the following raw material components: by mass percentage, 40 to 50 percent of waste concrete, 30 to 40 percent of slag powder, 20 to 35 percent of desulfurized gypsum, 0.5 to 1 percent of steel slag, 5 to 15 percent of zeolite powder and 0.5 to 2.2 percent of sodium hydroxide.
Preferably, the sugar is one or more of galactose, glucose, dextrose, lactose, maltose and sucrose.
Preferably, the fiber composition comprises cellulose fibers, carbon fibers and calcium carbonate filler, the weight of the cellulose fibers: the weight of the calcium carbonate filler is (1: 33) - (10: 1); the weight of the carbon fiber: the weight of the cellulose fiber is (1: 2) - (2: 1).
Preferably, the aggregate is one or more of limestone, broken stone and gravel; the curing agent is an epoxy curing agent.
Preferably, the method comprises the following steps:
1) preparing recycled concrete;
a) pre-treating;
b) hydrothermal treatment;
c) primary calcination;
d) stirring and mixing;
e) secondary calcination;
f) obtaining recycled concrete;
2) preparing a cement composition;
3) preparing a fiber composition;
4) preparing a tubular pile;
a) weighing the cement composition, the aggregate, the water reducing agent, the fiber composition and the curing agent according to a certain proportion, mixing the cement composition, the aggregate, the water reducing agent, the fiber composition and the curing agent with a certain amount of water, and putting the mixture into a stirrer for high-speed stirring to obtain a mixed material;
b) manufacturing a reinforcement cage with a pile head, and putting the reinforcement cage with the pile head into a mold;
c) pouring the prepared mixed material into a lower half die, and screwing the upper half die and the lower half die to obtain a pile die;
d) longitudinally tensioning, and placing the tensioned pile mould on a centrifugal machine for centrifugal forming to obtain a semi-finished tubular pile;
e) performing normal-pressure steam curing on the semi-finished pipe pile, and then putting the semi-finished pipe pile into an autoclave for high-pressure steam curing;
5) and obtaining the tubular pile.
Preferably, the method comprises the following steps:
1) preparing recycled concrete;
a) pretreatment: crushing the waste concrete, and sieving the crushed waste concrete through a 38-270 mu m sieve to obtain waste concrete powder; mixing zeolite powder and waste concrete powder, and putting the mixture into a ball mill for ball milling to obtain first mixed powder, wherein the ball milling time is 2-3 hours;
b) hydrothermal: adding the first mixed powder into a sodium hydroxide solution, carrying out hydrothermal treatment for 1-3 days at the hydrothermal temperature of 30-100 ℃, and filtering by using a 200-mesh and 500-mesh screen to obtain second mixed powder; the concentration of the sodium hydroxide solution is 1-3 mol/L;
c) primary calcination: putting the second mixed powder into a calcining furnace for primary calcining to obtain cement raw material powder; the primary calcination temperature is 800-900 ℃, and the primary calcination time is 2-2.5 h;
d) stirring and mixing: respectively crushing the desulfurized gypsum and the steel slag, and respectively sieving the crushed desulfurized gypsum and the steel slag through a sieve of 50-200 mu m to respectively obtain desulfurized gypsum powder and steel slag powder; then putting the slag powder and the steel slag powder into a ball mill for ball milling to obtain third mixed powder, wherein the ball milling time is 3-3.5 h;
e) secondary calcination: mixing the cement raw material powder and the third mixed powder, and putting the mixture into a calcining furnace for secondary calcining to obtain cement clinker; the secondary calcination temperature is 700-850 ℃, and the secondary calcination time is 1-2 h;
f) obtaining the recycled concrete: weighing cement clinker and desulfurized gypsum powder with required component ratio, wherein the mass of the cement clinker is as follows: the mass of the desulfurized gypsum powder is 100: (5-10), mixing and stirring to obtain recycled concrete;
2) preparing a cement composition;
a) respectively putting pumice, pozzolan cement and silica fume into a grinding machine for grinding, and filtering by using a 200-mesh and 500-mesh screen to obtain fourth mixed powder;
b) weighing sugar with a certain component, mixing the sugar with a solvent, stirring, placing for 24 hours, adding the recycled concrete and the fourth mixed powder, and stirring uniformly to obtain a first mixed material;
c) weighing a certain mass of fly ash and aluminum hydroxide, and sequentially putting the first mixed material, the fly ash and the aluminum hydroxide into a calcining furnace for three times of calcining to obtain a cement composition; the third calcination temperature is 800-900 ℃, and the third calcination time is 2-2.5 h;
3) preparing a fiber composition;
a) weighing fibers and calcium carbonate filler according to a certain proportion, firstly placing the fibers in an aqueous environment to fibrillate the fibers until nano fibrous gel is formed;
b) then mixing the calcium carbonate filler with the nano fibrous gel, and stirring uniformly; obtaining a mixed material;
c) weighing a certain amount of carbon fibers, combining the mixed material with the carbon fibers, dehydrating, and manufacturing into a structured material to obtain a fiber composition;
4) preparing a tubular pile;
a) weighing the cement composition, the aggregate, the water reducing agent, the fiber composition and the curing agent according to a certain proportion, mixing with a certain amount of water, putting into a stirrer for high-speed stirring for 1-2h to obtain a second mixed material;
b) manufacturing a reinforcement cage with a pile head, and putting the reinforcement cage with the pile head into a mold;
c) pouring the prepared mixed material into a lower half die, and screwing the upper half die and the lower half die to obtain a pile die with the material;
d) longitudinally tensioning, and placing the tensioned pile mould with the material on a centrifugal machine for centrifugal forming to obtain a semi-finished tubular pile;
e) performing normal pressure steam curing on the semi-finished product pipe pile for 2-3h, and then performing normal pressure steam curing on the semi-finished product pipe pile
f) Placing the mixture into an autoclave for high-pressure steam curing, wherein the temperature in the autoclave is 200 ℃ and 220 ℃, and the high-pressure steam curing time is 5-8 h;
5) and obtaining the tubular pile.
Compared with the prior art, the invention has the beneficial effects that:
the invention designs a method for processing a cement pipe pile by utilizing carbon fibers and recycled concrete, wherein the recycled concrete is prepared by secondarily utilizing the waste concrete, and the cement composition is obtained by processing the recycled concrete and is used as a base material for preparing the cement pipe pile, so that the mechanical property of the cement pipe pile is improved, the cost is reduced, and the method has higher economic benefit and is effective and practical; according to the invention, the fiber composition is obtained by processing the carbon fibers and the cellulose fibers, and the fiber composition is easily dispersed into fiber monofilaments under the action of water immersion and the friction force of a stirrer, so that the anti-cracking effect is achieved, the mechanical property of the cement pipe pile can be effectively improved, and the freeze-thaw resistance and the impermeability of the cement pipe pile are enhanced.
When the recycled concrete is prepared, the zeolite powder is added, so that the unit pore volume in the material can be effectively reduced, microcracks generated in the preparation process of the recycled concrete are bonded or repaired, the bonding strength among the components is enhanced, the structure of an interface area of the recycled concrete tends to be compact, and the compactness among the components in the preparation of the cement pipe pile is improved.
According to the invention, the two times of calcination are carried out during the preparation of the recycled concrete, meanwhile, the hydrothermal treatment is carried out on the first mixed powder before the calcination, and an alkaline environment is provided for the subsequent synthesis reaction through a sodium hydroxide solution, so that the fly ash can be fully activated, and the synthesis speed of the recycled concrete is improved.
When the waste concrete is recycled, the waste concrete is crushed and stirred, and various auxiliary materials are added to prepare the recycled concrete, wherein the proportion of the waste concrete is reduced along with the increase of the proportion of the steel slag, the strength of the recycled concrete can show a trend of increasing first and then reducing, when the mass percentage of the steel slag is 0.8%, the strength reaches the highest value, the proportion of the steel slag is continuously increased, and the strength is reduced on the contrary, so that the mass percentage of the steel slag in the invention is selected to be 0.8%; the steel slag is added, so that the alkalinity of the whole system can be excited during reaction, the alkalinity range which is most suitable for the generation of hydration products exists in the whole system during hydration, and the generation of the hydration products is improved.
The invention also adds the desulfurized gypsum, which can improve the strength of the recycled concrete. The steel slag can excite the system to be alkaline, the slag powder generates a large amount of ettringite and C-S-H gel on the surface of limestone in the waste concrete under the excitation of the alkali, the waste concrete particles are tightly connected together to form a space network structure, then the C-S-H gel and ettringite generated by continuous hydration of the slag powder are continuously filled in the pores of the network, finally the waste concrete particles are wrapped and the slurry is more compact, the strength of the recycled concrete is improved, and therefore the strength of the cement pipe pile prepared by taking the recycled concrete as the raw material is improved.
After the recycled concrete is prepared, the components are added to prepare the cement composition, so that the permeability of chloride ions of the cement pipe pile can be reduced, the flexural strength and the module strength are increased, the addition of the cane sugar reduces the amount of cementing materials required in the preparation process, the cost is reduced, the wear resistance of the cement pipe pile is improved, and the shrinkage rate is reduced.
When the cement composition is prepared, the fly ash is added, so that the fly ash can be matched with silica fume to realize a double-doping effect, and simultaneously, the fly ash can be matched with zeolite powder in recycled concrete to improve the compatibility among the components of the cement composition; the aluminum hydroxide is added during the three-time calcination, and the aluminum hydroxide, the fly ash and the alkaline environment in the recycled concrete are matched with each other, so that the overall activation degree of the fly ash is improved, zeolite can be generated during the three-time calcination, the compactness of the recycled concrete is further improved, the interface structure of the recycled concrete is improved, and the cohesiveness between the recycled concrete and other components can be improved during the preparation of the cement composition.
When the fiber composition is prepared, the formation of gel is influenced by excessive calcium carbonate filler, the amount of the calcium carbonate filler is selected to be controlled, the formation of the gel is accelerated, the components can be better mixed when the cement pipe pile is prepared, the amount of colloid is reduced, and the cost is saved.
The water reducing agent is selected from a polycarboxylic acid high-efficiency water reducing agent or a naphthalene water reducing agent, the cement composition is added with silica fume, the 'double-doping' effect is achieved through the polycarboxylic acid high-efficiency water reducing agent and the silica fume, meanwhile, the fly ash is added during preparation of a cement mixture, and the PH of a pore liquid during material mixing is reduced through the dilution effect and the chemical effect due to the matching of the fly ash and the silica fume; in the subsequent steps, after the materials are mixed and stirred and a semi-finished tubular pile is prepared, normal-pressure steam curing is adopted, the cement hydration reaction speed is accelerated along with the increase of the curing temperature, and the alkalinity reduction speed in concrete is accelerated;
meanwhile, due to the matching of the polycarboxylic acid high-efficiency water reducing agent and the silica fume and the matching of the fly ash and the slag powder, when a mixed material is stirred during the preparation of the tubular pile, all components in the mixed material are quickly dissolved, so that the alkalinity in the mixed material is quickly improved, the hydration temperature of the mixed material is also improved, the hydration reaction speed is accelerated, the generation quantity of hydration products is increased, and the demolding strength of the cement tubular pile is improved.
According to the invention, a direct die assembly pouring method is adopted, and concrete is directly poured into the inner cavity of the die, so that the phenomenon that concrete particles fall off is avoided, the labor cost is reduced, and the labor force is saved; and meanwhile, the upper die and the lower die are screwed down during die assembly, so that the problem of slurry leakage during joint sealing of the concrete pipe pile is avoided, and the quality of the concrete pipe pile is ensured.
The invention provides a method for processing a cement pipe pile by using carbon fibers and recycled concrete, which is characterized in that reasonable proportioning components are controlled, so that the prepared cement pipe pile has better mechanical property, the chloride ion permeability of the whole cement pipe pile is reduced by preparing a cement composition, and meanwhile, waste concrete is used as a base material for preparation, so that the cost is saved, and the method has higher economic effect.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
firstly, preparing recycled concrete, crushing the waste concrete, and sieving the crushed waste concrete through a 38-micron sieve to obtain waste concrete powder; mixing zeolite powder and waste concrete powder, and putting the mixture into a ball mill for ball milling to obtain first mixed powder, wherein the ball milling time is 2 hours; adding the first mixed powder into a sodium hydroxide solution, carrying out hydrothermal treatment for 1 day at the hydrothermal temperature of 30 ℃, and filtering by using a 200-mesh screen to obtain second mixed powder; the concentration of the sodium hydroxide solution is 1 mol/L; then, putting the second mixed powder into a calcining furnace for primary calcining to obtain cement raw material powder; the primary calcination temperature is 800 ℃, and the primary calcination time is 2 hours; respectively crushing the desulfurized gypsum and the steel slag, and respectively sieving the crushed desulfurized gypsum and the crushed steel slag through a 50-micrometer sieve to respectively obtain desulfurized gypsum powder and steel slag powder; then putting the slag powder and the steel slag powder into a ball mill for ball milling to obtain third mixed powder, wherein the ball milling time is 3 hours; mixing the cement raw material powder and the third mixed powder, and putting the mixture into a calcining furnace for secondary calcination to obtain cement clinker; the secondary calcination temperature is 700 ℃, and the secondary calcination time is 1 h; and finally weighing cement clinker and desulfurized gypsum powder with required component ratios, wherein the mass of the cement clinker is as follows: the mass of the desulfurized gypsum powder is 20: 1, mixing and stirring to obtain the recycled concrete.
Then preparing a cement composition, namely respectively putting pumice, pozzolana cement and silica fume into a grinding machine for grinding, and filtering by using a 200-mesh screen to obtain fourth mixed powder; weighing sugar with a certain component, mixing with the solvent, stirring, standing for 24h, adding the recycled concrete and the fourth mixed powder, and uniformly stirring to obtain a first mixed material; weighing a certain mass of fly ash and aluminum hydroxide, and sequentially putting the first mixed material, the fly ash and the aluminum hydroxide into a calcining furnace for three times of calcining to obtain a cement composition; the third calcination temperature is 800 ℃, and the third calcination time is 2 hours.
Then preparing a fiber composition, firstly weighing fibers and calcium carbonate filler according to a certain proportion, firstly placing the fibers in an aqueous environment to fibrillate the fibers until nano fibrous gel is formed; then mixing the calcium carbonate filler with the nano fibrous gel, and stirring uniformly; obtaining a mixed material; and finally, weighing a certain amount of carbon fibers, combining the mixed material with the carbon fibers, dehydrating, and manufacturing into a structured material to obtain the fiber composition.
Finally, preparing the tubular pile, namely weighing the cement composition, the aggregate, the water reducing agent, the fiber composition and the curing agent according to a certain proportion, mixing the cement composition, the aggregate, the water reducing agent, the fiber composition and the curing agent with a certain amount of water, putting the mixture into a stirrer for high-speed stirring for 1 hour to obtain a second mixed material; then manufacturing a reinforcement cage with a pile head, and putting the reinforcement cage with the pile head into a mold; pouring the prepared mixed material into a lower half die, and screwing the upper half die and the lower half die to obtain a pile die with the material; then longitudinally tensioning, and placing the tensioned pile mould with the material on a centrifuge for centrifugal forming to obtain a semi-finished tubular pile; and (3) performing normal-pressure steam curing on the last semi-finished product pipe pile for 2 hours, and then putting the semi-finished product pipe pile into an autoclave for high-pressure steam curing, wherein the temperature in the autoclave is 200 ℃, and the high-pressure steam curing time is 5 hours.
In the embodiment, the raw material components by weight are as follows: 525 parts of cement composition, 1325 parts of aggregate, 250 parts of water, 26 parts of water reducing agent, 200 parts of fiber composition and 40 parts of curing agent.
Wherein the cement composition comprises the following raw material components: 10% of solvent, 40% of recycled concrete, 22% of volcanic ash cement, 0.05% of sugar, 25% of pumice, 1.2% of silica fume, 1% of aluminum hydroxide and 0.75% of fly ash.
The recycled concrete comprises the following raw material components: 40% of waste concrete, 30% of slag powder, 20% of desulfurized gypsum, 0.8% of steel slag, 7% of zeolite powder and 2.2% of sodium hydroxide.
Example 2:
firstly, preparing recycled concrete, crushing the waste concrete, and sieving the crushed waste concrete through a 200-micron sieve to obtain waste concrete powder; mixing zeolite powder with waste concrete powder, and putting the mixture into a ball mill for ball milling to obtain first mixed powder, wherein the ball milling time is 2 hours; adding the first mixed powder into a sodium hydroxide solution, carrying out hydrothermal treatment for 1 day at the hydrothermal temperature of 30 ℃, and filtering by using a 200-mesh screen to obtain second mixed powder; the concentration of the sodium hydroxide solution is 2 mol/L; then, putting the second mixed powder into a calcining furnace for primary calcining to obtain cement raw material powder; the primary calcination temperature is 850 ℃, and the primary calcination time is 2 hours; respectively crushing the desulfurized gypsum and the steel slag, and respectively sieving the crushed desulfurized gypsum and the crushed steel slag through a 50-micrometer sieve to respectively obtain desulfurized gypsum powder and steel slag powder; then putting the slag powder and the steel slag powder into a ball mill for ball milling to obtain third mixed powder, wherein the ball milling time is 3 hours; mixing the cement raw material powder and the third mixed powder, and putting the mixture into a calcining furnace for secondary calcination to obtain cement clinker; the secondary calcination temperature is 700 ℃, and the secondary calcination time is 1 h; and finally weighing cement clinker and desulfurized gypsum powder with required component ratios, wherein the mass of the cement clinker is as follows: the mass of the desulfurized gypsum powder is 10: 1, mixing and stirring to obtain the recycled concrete.
Then preparing a cement composition, namely respectively putting pumice, pozzolana cement and silica fume into a grinding machine for grinding, and filtering by using a 200-mesh screen to obtain fourth mixed powder; weighing sugar with a certain component, mixing with the solvent, stirring, standing for 24h, adding the recycled concrete and the fourth mixed powder, and uniformly stirring to obtain a first mixed material; weighing a certain mass of fly ash and aluminum hydroxide, and sequentially putting the first mixed material, the fly ash and the aluminum hydroxide into a calcining furnace for three times of calcining to obtain a cement composition; the temperature of the third calcination is 850 ℃, and the time of the third calcination is 2.2 h.
Then preparing a fiber composition, firstly weighing fibers and calcium carbonate filler according to a certain proportion, firstly placing the fibers in an aqueous environment to fibrillate the fibers until nano fibrous gel is formed; then mixing the calcium carbonate filler with the nano fibrous gel, and stirring uniformly; obtaining a mixed material; and finally weighing a certain amount of carbon fibers, combining the mixed material with the carbon fibers, dehydrating, and manufacturing into a structured material to obtain the fiber composition.
Finally, preparing the tubular pile, namely weighing the cement composition, the aggregate, the water reducing agent, the fiber composition and the curing agent according to a certain proportion, mixing the cement composition, the aggregate, the water reducing agent, the fiber composition and the curing agent with a certain amount of water, putting the mixture into a stirrer for high-speed stirring for 1.5 hours to obtain a second mixed material; then manufacturing a reinforcement cage with a pile head, and putting the reinforcement cage with the pile head into a mould; pouring the prepared mixed material into a lower half die, and screwing the upper half die and the lower half die to obtain a pile die with the material; then longitudinally tensioning, and placing the tensioned pile mould with the material on a centrifuge for centrifugal forming to obtain a semi-finished tubular pile; and (3) performing normal-pressure steam curing on the last semi-finished product of the tubular pile for 2.5 hours, and then putting the semi-finished product of the tubular pile into an autoclave for high-pressure steam curing, wherein the temperature in the autoclave is 210 ℃, and the high-pressure steam curing time is 7 hours, so as to obtain the required tubular pile.
In the embodiment, the raw material components by weight are as follows: 500 parts of cement composition, 1300 parts of aggregate, 200 parts of water, 20 parts of water reducing agent, 175 parts of fiber composition and 25 parts of curing agent.
Wherein the cement composition comprises the following raw material components: 10% of solvent, 40% of recycled concrete, 22% of volcanic ash cement, 0.05% of sugar, 25% of pumice, 1.2% of silica fume, 1% of aluminum hydroxide and 0.75% of fly ash.
The recycled concrete comprises the following raw material components: 40% of waste concrete, 30% of slag powder, 20% of desulfurized gypsum, 0.8% of steel slag, 7% of zeolite powder and 2.2% of sodium hydroxide.
Example 3:
firstly, preparing recycled concrete, crushing the waste concrete, and sieving the crushed waste concrete through a 270-micron sieve to obtain waste concrete powder; mixing zeolite powder and waste concrete powder, and putting the mixture into a ball mill for ball milling to obtain first mixed powder, wherein the ball milling time is 3 hours; adding the first mixed powder into a sodium hydroxide solution, carrying out hydrothermal treatment for 3 days at the hydrothermal temperature of 100 ℃, and filtering by using a 500-mesh screen to obtain second mixed powder; the concentration of the sodium hydroxide solution is 3 mol/L; then, putting the second mixed powder into a calcining furnace for primary calcining to obtain cement raw material powder; the primary calcination temperature is 900 ℃, and the primary calcination time is 2.5 h; respectively crushing the desulfurized gypsum and the steel slag, and respectively sieving the crushed desulfurized gypsum and the steel slag through a 200-micron sieve to respectively obtain desulfurized gypsum powder and steel slag powder; then putting the slag powder and the steel slag powder into a ball mill for ball milling to obtain third mixed powder, wherein the ball milling time is 3.5 hours; mixing the cement raw material powder and the third mixed powder, and putting the mixture into a calcining furnace for secondary calcination to obtain cement clinker; the secondary calcination temperature is 850 ℃, and the secondary calcination time is 2 hours; and finally weighing cement clinker and desulfurized gypsum powder with required component ratios, wherein the mass of the cement clinker is as follows: the mass of the desulfurized gypsum powder is 10: 1, mixing and stirring to obtain the recycled concrete.
Then preparing a cement composition, namely respectively putting pumice, pozzolana cement and silica fume into a grinding machine for grinding, and filtering by using a 500-mesh screen to obtain fourth mixed powder; weighing sugar with a certain component, mixing with the solvent, stirring, standing for 24h, adding the recycled concrete and the fourth mixed powder, and uniformly stirring to obtain a first mixed material; weighing a certain mass of fly ash and aluminum hydroxide, and sequentially putting the first mixed material, the fly ash and the aluminum hydroxide into a calcining furnace for three times of calcining to obtain a cement composition; the three-time calcination temperature is 900 ℃, and the three-time calcination time is 2.5 h.
Preparing a fiber composition, namely weighing fibers and calcium carbonate filler according to a certain proportion, firstly placing the fibers in an aqueous environment to fibrillate the fibers until nano fibrous gel is formed; then mixing the calcium carbonate filler with the nano fibrous gel, and stirring uniformly; obtaining a mixed material; and finally weighing a certain amount of carbon fibers, combining the mixed material with the carbon fibers, dehydrating, and manufacturing into a structured material to obtain the fiber composition.
Finally, preparing the tubular pile, namely weighing the cement composition, the aggregate, the water reducing agent, the fiber composition and the curing agent according to a certain proportion, mixing the cement composition, the aggregate, the water reducing agent, the fiber composition and the curing agent with a certain amount of water, putting the mixture into a stirrer for high-speed stirring for 2 hours to obtain a second mixed material; then manufacturing a reinforcement cage with a pile head, and putting the reinforcement cage with the pile head into a mold; pouring the prepared mixed material into a lower half die, and screwing the upper half die and the lower half die to obtain a pile die with the material; then longitudinally tensioning, and placing the tensioned pile mould with the material on a centrifuge for centrifugal forming to obtain a semi-finished tubular pile; and (3) performing normal-pressure steam curing on the last semi-finished product pipe pile for 3 hours, and then putting the semi-finished product pipe pile into an autoclave for high-pressure steam curing, wherein the temperature in the autoclave is 220 ℃, and the high-pressure steam curing time is 8 hours, so as to obtain the required pipe pile.
In the embodiment, the raw material components by weight are as follows: 550 parts of cement composition, 1350 parts of aggregate, 300 parts of water, 35 parts of water reducing agent, 250 parts of fiber composition and 50 parts of curing agent.
Wherein the cement composition comprises the following raw material components: 10% of solvent, 40% of recycled concrete, 22% of volcanic ash cement, 0.05% of sugar, 25% of pumice, 1.2% of silica fume, 1% of aluminum hydroxide and 0.75% of fly ash.
The recycled concrete comprises the following raw material components: 40% of waste concrete, 30% of slag powder, 20% of desulfurized gypsum, 0.8% of steel slag, 7% of zeolite powder and 2.2% of sodium hydroxide.
Example 4:
firstly, preparing a cement composition, namely respectively putting pumice, pozzolana cement and silica fume into a grinding machine for grinding, and filtering by using a 200-mesh screen to obtain mixed powder; weighing sugar with a certain component, mixing with the solvent, stirring, standing for 24h, adding portland cement and the mixed powder, and stirring uniformly to obtain a first mixed material; weighing a certain mass of fly ash, and sequentially putting the first mixed material and the fly ash into a calcining furnace for calcining to obtain a cement composition; the calcining temperature is 800 ℃, and the calcining time is 2 h.
Then preparing a fiber composition, firstly weighing fibers and calcium carbonate filler according to a certain proportion, placing the fibers in an aqueous environment, fibrillating the fibers until nano fibrous gel is formed; then mixing the calcium carbonate filler with the nano fibrous gel, and stirring uniformly; obtaining a mixed material; weighing a certain amount of carbon fibers, combining the mixed material with the carbon fibers, dehydrating, and manufacturing into a structured material to obtain the fiber composition.
Finally, preparing the tubular pile, namely weighing the cement composition, the aggregate, the water reducing agent, the fiber composition and the curing agent according to a certain proportion, mixing the cement composition, the aggregate, the water reducing agent, the fiber composition and the curing agent with a certain amount of water, putting the mixture into a stirrer for high-speed stirring for 1 hour to obtain a second mixed material; then manufacturing a reinforcement cage with a pile head, and putting the reinforcement cage with the pile head into a mold; pouring the prepared mixed material into a lower half die, and screwing the upper half die and the lower half die to obtain a pile die with the material; longitudinally tensioning, and placing the tensioned pile mould with the material on a centrifugal machine for centrifugal forming to obtain a semi-finished tubular pile; carrying out normal pressure steam curing on the semi-finished product pipe pile for 2 hours, and then putting the semi-finished product pipe pile into an autoclave for high pressure steam curing, wherein the temperature in the autoclave is 200 ℃, and the high pressure steam curing time is 5 hours; and obtaining the tubular pile.
In the embodiment, the raw material components by weight are as follows: 550 parts of cement composition, 1350 parts of aggregate, 300 parts of water, 35 parts of water reducing agent, 250 parts of fiber composition and 50 parts of curing agent.
Wherein the cement composition comprises the following raw material components: 10% of solvent, 40% of silicate concrete, 22% of volcanic ash cement, 0.05% of sugar, 26% of pumice, 1.2% of silica fume and 0.75% of fly ash.
Example 5:
firstly, preparing recycled concrete, crushing the waste concrete, and sieving the crushed waste concrete through a 270-micron sieve to obtain waste concrete powder; mixing zeolite powder and waste concrete powder, and putting the mixture into a ball mill for ball milling to obtain first mixed powder, wherein the ball milling time is 3 hours; adding the first mixed powder into a sodium hydroxide solution, carrying out hydrothermal treatment for 3 days at the hydrothermal temperature of 100 ℃, and filtering by using a 500-mesh screen to obtain second mixed powder; the concentration of the sodium hydroxide solution is 3 mol/L; then, putting the second mixed powder into a calcining furnace for primary calcining to obtain cement raw material powder; the primary calcination temperature is 900 ℃, and the primary calcination time is 2.5 h; respectively crushing the desulfurized gypsum and the steel slag, and respectively sieving the crushed desulfurized gypsum and the steel slag through a 200-micron sieve to respectively obtain desulfurized gypsum powder and steel slag powder; then putting the slag powder and the steel slag powder into a ball mill for ball milling to obtain third mixed powder, wherein the ball milling time is 3.5 hours; mixing the cement raw material powder and the third mixed powder, and putting the mixture into a calcining furnace for secondary calcination to obtain cement clinker; the secondary calcination temperature is 850 ℃, and the secondary calcination time is 2 hours; and finally weighing cement clinker and desulfurized gypsum powder with required component ratios, wherein the mass of the cement clinker is as follows: the mass of the desulfurized gypsum powder is 10: 1, mixing and stirring to obtain the recycled concrete.
Then preparing a cement composition, namely respectively putting pumice, pozzolana cement and silica fume into a grinding machine for grinding, and filtering by using a 500-mesh screen to obtain fourth mixed powder; weighing sugar with a certain component, mixing with the solvent, stirring, standing for 24h, adding the recycled concrete and the fourth mixed powder, and uniformly stirring to obtain a first mixed material; weighing a certain mass of fly ash and aluminum hydroxide, and sequentially putting the first mixed material, the fly ash and the aluminum hydroxide into a calcining furnace for three times of calcining to obtain a cement composition; the temperature of the third calcination is 900 ℃, and the time of the third calcination is 2.5 h.
Finally, preparing the tubular pile, namely weighing the cement composition, the aggregate, the water reducing agent and the curing agent according to a certain proportion, mixing the cement composition, the aggregate, the water reducing agent and the curing agent with a certain amount of water, putting the mixture into a stirrer for high-speed stirring for 2 hours to obtain a second mixed material; then manufacturing a reinforcement cage with a pile head, and putting the reinforcement cage with the pile head into a mold; pouring the prepared mixed material into a lower half die, and screwing the upper half die and the lower half die to obtain a pile die with the material; then longitudinally tensioning, and placing the tensioned pile mould with the material on a centrifuge for centrifugal forming to obtain a semi-finished tubular pile; and (3) performing normal-pressure steam curing on the last semi-finished product pipe pile for 3 hours, and then putting the semi-finished product pipe pile into an autoclave for high-pressure steam curing, wherein the temperature in the autoclave is 220 ℃, and the high-pressure steam curing time is 8 hours, so as to obtain the required pipe pile.
In the embodiment, the raw material components by weight are as follows: 550 parts of cement composition, 1350 parts of aggregate, 300 parts of water, 35 parts of water reducing agent, 250 parts of fiber composition and 50 parts of curing agent.
Wherein the cement composition comprises the following raw material components: 10% of solvent, 40% of recycled concrete, 22% of volcanic ash cement, 0.05% of sugar, 25% of pumice, 1.2% of silica fume, 1% of aluminum hydroxide and 0.75% of fly ash.
The recycled concrete comprises the following raw material components: 40% of waste concrete, 30% of slag powder, 20% of desulfurized gypsum, 0.8% of steel slag, 7% of zeolite powder and 2.2% of sodium hydroxide.
Example 6:
firstly, preparing recycled concrete, crushing the waste concrete, and sieving the crushed waste concrete through a 270-micron sieve to obtain waste concrete powder; mixing zeolite powder and waste concrete powder, and putting the mixture into a ball mill for ball milling to obtain first mixed powder, wherein the ball milling time is 3 hours; adding the first mixed powder into a sodium hydroxide solution, carrying out hydrothermal treatment for 3 days at the hydrothermal temperature of 100 ℃, and filtering by using a 500-mesh screen to obtain second mixed powder; the concentration of the sodium hydroxide solution is 3 mol/L; then, putting the second mixed powder into a calcining furnace for primary calcining to obtain cement raw material powder; the primary calcination temperature is 900 ℃, and the primary calcination time is 2.5 h; respectively crushing the desulfurized gypsum and the steel slag, and respectively sieving the crushed desulfurized gypsum and the steel slag through a 200-micron sieve to respectively obtain desulfurized gypsum powder and steel slag powder; then putting the slag powder and the steel slag powder into a ball mill for ball milling to obtain third mixed powder, wherein the ball milling time is 3.5 hours; mixing the cement raw material powder and the third mixed powder, and putting the mixture into a calcining furnace for secondary calcination to obtain cement clinker; the secondary calcination temperature is 850 ℃, and the secondary calcination time is 2 hours; and finally weighing cement clinker and desulfurized gypsum powder with required component ratios, wherein the mass of the cement clinker is as follows: the mass of the desulfurized gypsum powder is 10: 1, mixing and stirring to obtain the recycled concrete.
Then preparing a fiber composition, firstly weighing fibers and calcium carbonate filler according to a certain proportion, firstly placing the fibers in an aqueous environment to fibrillate the fibers until nano fibrous gel is formed; then mixing the calcium carbonate filler with the nano fibrous gel, and stirring uniformly; obtaining a mixed material; and finally weighing a certain amount of carbon fibers, combining the mixed material with the carbon fibers, dehydrating, and manufacturing into a structured material to obtain the fiber composition.
Finally, preparing the tubular pile, namely weighing the recycled concrete, the aggregate, the water reducing agent, the fiber composition and the curing agent according to a certain proportion, mixing the recycled concrete, the aggregate, the water reducing agent, the fiber composition and the curing agent with a certain amount of water, putting the mixture into a stirrer for high-speed stirring for 2 hours to obtain a second mixed material; then manufacturing a reinforcement cage with a pile head, and putting the reinforcement cage with the pile head into a mold; pouring the prepared mixed material into a lower half die, and screwing the upper half die and the lower half die to obtain a pile die with the material; then longitudinally tensioning, and placing the tensioned pile mould with the material on a centrifuge for centrifugal forming to obtain a semi-finished tubular pile; and (3) performing normal-pressure steam curing on the last semi-finished product pipe pile for 3 hours, and then putting the semi-finished product pipe pile into an autoclave for high-pressure steam curing, wherein the temperature in the autoclave is 220 ℃, and the high-pressure steam curing time is 8 hours, so as to obtain the required pipe pile.
In the embodiment, the raw material components by weight are as follows: 550 parts of cement composition, 1350 parts of aggregate, 300 parts of water, 35 parts of water reducing agent, 250 parts of fiber composition and 50 parts of curing agent.
Wherein the cement composition comprises the following raw material components: 10% of solvent, 40% of recycled concrete, 22% of volcanic ash cement, 0.05% of sugar, 25% of pumice, 1.2% of silica fume, 1% of aluminum hydroxide and 0.75% of fly ash.
The recycled concrete comprises the following raw material components: 40% of waste concrete, 30% of slag powder, 20% of desulfurized gypsum, 0.8% of steel slag, 7% of zeolite powder and 2.2% of sodium hydroxide.
Detection experiment:
examples 1-6 are comparative experiments in which the cement compositions of examples 1, 2, 3 were all prepared from recycled concrete, whereas example 4 was prepared by replacing recycled concrete with portland concrete, no fiber composition was added in example 5, and the cement pipe pile was prepared directly from the cement composition, whereas example 6 was prepared without cement composition, and the pipe pile was prepared directly from recycled concrete and fiber composition, with negligible effect on the remaining control parameters.
Test 1: chloride ion diffusion coefficient detection
Firstly, cutting concrete into cylindrical samples with the diameter of 100mm and the thickness of 50 +/-2 mm, cleaning the samples in an ultrasonic bath, mounting the cleaned samples on a sample clamp, injecting a test solution, and connecting the test solution with a test host; opening a host of the NJ-RCM chloride ion diffusion coefficient tester to perform an electromigration experiment; then cleaving the sample after electromigration along the axial direction, spraying a silver nitrate solution on the cleaved surface, determining the diffusion depth, and calculating the diffusion coefficient; wherein the anode solution is 0.3mol/l sodium hydroxide solution, the cathode solution is 10% sodium chloride solution, and the soaking solution is calcium hydroxide solution.
Diffusion coefficient calculation formula:
Figure BDA0001876306910000221
wherein D is the migration coefficient of concrete chloride ions, T is the duration of the experiment, M is the average value of the penetration depth of the chloride ions, T is the average value of the initial temperature and the ending temperature of the anode solution, and U is the absolute value of the used voltage.
And (3) testing 2: compressive strength
Firstly, cutting concrete into cubic samples with the side length of 100mm, loading the samples at the loading speed of 0.5-0.8MPa/s by a press machine, recording the maximum load which can be borne by the concrete, calculating the strength of the concrete, and multiplying the measured strength by a reduction coefficient of 0.95 to obtain the final compressive strength.
And (3) testing: mechanical properties and electric flux
The mechanical properties of the tubular piles prepared in examples 1 to 6 were measured, and the electric flux was measured at the same time.
Figure BDA0001876306910000231
The mechanical properties of the cement pipe piles prepared in examples 1, 2, 3, 4, 5 and 6 were measured, and the measurement results were compared:
as shown in the above table, in example 4, the recycled concrete is replaced by the silicate concrete, and the cement pipe pile is prepared directly by the cement composition, compared with the experiments in examples 1 to 3, the data of the pipe pile obtained in example 4 shows that the pipe pile prepared by the invention has improved properties, strong bending resistance, improved compressive strength and reduced chloride ion diffusion coefficient; meanwhile, the cement compositions in the examples 1 to 3 are all prepared by recycled concrete, the fiber composition is not added in the example 5, and the data of the examples 1 to 3 are compared with the data of the example 5, so that the compressive strength is obviously reduced in the example 5, which fully indicates that the compressive strength of the pipe pile is greatly improved by preparing the fiber composition; the cement composition is not prepared in example 6, and the data of comparative examples 1-3 and example 6 show that the diffusion coefficient of chloride ions is significantly improved in example 6, which fully illustrates that the preparation of the cement composition reduces the diffusion coefficient of chloride ions and increases bending and compressive capacities, while the compressive strength, bending capacity and compressive capacity of the cement pipe pile prepared in examples 1-3 are significantly improved and the diffusion of chloride ions is effectively prevented.
From the above data and experiments, we can conclude that: according to the invention, reasonable proportioning components are controlled, so that the prepared cement pipe pile has better mechanical properties, the chloride ion permeability of the whole cement pipe pile is reduced through the preparation of the cement composition, and meanwhile, the waste concrete is used as a base material for preparation, so that the cost is saved, the mechanical properties of the cement pipe pile, such as compressive strength, bending resistance and the like, are improved, and the cement pipe pile has greater practicability.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (1)

1. A method for processing a cement pipe pile by utilizing carbon fibers and recycled concrete is characterized by comprising the following steps of: the raw material components are as follows: the cement composite comprises, by weight, 550 parts of cement composite, 1300 parts of aggregate, 1350 parts of water, 200 parts of water, 20-35 parts of water reducing agent, 250 parts of fiber composite and 25-50 parts of curing agent;
the cement composition comprises the following raw material components: by mass percentage, 10% of solvent, 40% of recycled concrete, 22% of volcanic ash cement, 0.05% of sugar, 25% of pumice, 1.2% of silica fume, 1% of aluminum hydroxide and 0.75% of fly ash;
the recycled concrete comprises the following raw material components: by mass percentage, 40% of waste concrete, 30% of slag powder, 20% of desulfurized gypsum, 0.8% of steel slag, 7% of zeolite powder and 2.2% of sodium hydroxide;
the sugar is one or more of galactose, glucose, dextrose, lactose, maltose and sucrose;
the fiber composition comprises cellulose fibers, carbon fibers and calcium carbonate filler, wherein the weight ratio of the cellulose fibers is as follows: the weight of the calcium carbonate filler is (1: 33) - (10: 1); the weight of the carbon fiber is as follows: the weight of the cellulose fiber is (1: 2) - (2: 1);
the aggregate is one or more of limestone, broken stone and gravel; the curing agent is an epoxy curing agent;
the preparation method of the cement pipe pile comprises the following steps:
1) preparing recycled concrete;
a) pretreatment: crushing the waste concrete, and sieving the crushed waste concrete through a sieve with the particle size of 38-270 mu m to obtain waste concrete powder; mixing zeolite powder and waste concrete powder, and putting the mixture into a ball mill for ball milling to obtain first mixed powder, wherein the ball milling time is 2-3 hours;
b) hydrothermal: adding the first mixed powder into a sodium hydroxide solution, carrying out hydrothermal treatment for 1-3 days at the hydrothermal temperature of 30-100 ℃, and filtering by using a 200-mesh and 500-mesh screen to obtain second mixed powder; the concentration of the sodium hydroxide solution is 1-3 mol/L;
c) primary calcination: putting the second mixed powder into a calcining furnace for primary calcining to obtain cement raw material powder; the primary calcination temperature is 800-900 ℃, and the primary calcination time is 2-2.5 h;
d) stirring and mixing: respectively crushing the desulfurized gypsum and the steel slag, and respectively sieving the crushed desulfurized gypsum and the steel slag through a sieve of 50-200 mu m to respectively obtain desulfurized gypsum powder and steel slag powder; then putting the slag powder and the steel slag powder into a ball mill for ball milling to obtain third mixed powder, wherein the ball milling time is 3-3.5 h;
e) secondary calcination: mixing the cement raw material powder and the third mixed powder, and putting the mixture into a calcining furnace for secondary calcining to obtain cement clinker; the secondary calcination temperature is 700-850 ℃, and the secondary calcination time is 1-2 h;
f) obtaining the recycled concrete: weighing cement clinker and desulfurized gypsum powder with required component ratio, wherein the mass of the cement clinker is as follows: the mass of the desulfurized gypsum powder is 100: (5-10), mixing and stirring to obtain recycled concrete;
2) preparing a cement composition;
a) respectively putting pumice, pozzolan cement and silica fume into a grinding machine for grinding, and filtering by using a 200-mesh and 500-mesh screen to obtain fourth mixed powder;
b) weighing sugar with a certain component, mixing with a solvent, stirring, placing for 24h, adding recycled concrete and fourth mixed powder, and stirring uniformly to obtain a first mixed material;
c) weighing a certain mass of fly ash and aluminum hydroxide, and sequentially putting the first mixed material, the fly ash and the aluminum hydroxide into a calcining furnace for three times of calcining to obtain a cement composition; the third calcination temperature is 800-900 ℃, and the third calcination time is 2-2.5 h;
3) preparing a fiber composition;
a) weighing fibers and calcium carbonate filler according to a certain proportion, firstly placing the fibers in an aqueous environment to fibrillate the fibers until nano fibrous gel is formed;
b) then mixing the calcium carbonate filler with the nano fibrous gel, and stirring uniformly; obtaining a mixed material;
c) weighing a certain amount of carbon fibers, combining the mixed material with the carbon fibers, dehydrating, and manufacturing into a structured material to obtain a fiber composition;
4) preparing a tubular pile;
a) weighing the cement composition, the aggregate, the water reducing agent, the fiber composition and the curing agent according to a certain proportion, mixing with a certain amount of water, putting into a stirrer for high-speed stirring for 1-2h to obtain a second mixed material;
b) manufacturing a reinforcement cage with a pile head, and putting the reinforcement cage with the pile head into a mold;
c) pouring the prepared mixed material into a lower half die, and screwing the upper half die and the lower half die to obtain a pile die with the material;
d) longitudinally tensioning, and placing the tensioned pile mould with the material on a centrifugal machine for centrifugal forming to obtain a semi-finished tubular pile;
e) carrying out normal pressure steam curing on the semi-finished tubular pile for 2-3h, and then placing the semi-finished tubular pile into an autoclave for high pressure steam curing, wherein the temperature in the autoclave is 220 ℃ plus 200 ℃, and the high pressure steam curing time is 5-8 h;
5) and obtaining the tubular pile.
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Effective date of registration: 20220413

Address after: 445500 Gongshui white pomelo Industrial Technology Park, Xuanen County, Enshi Tujia and Miao Autonomous Prefecture, Hubei Province (Group 9, lananping village, shadaogou town)

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