CN116283088B - High-strength corrosion-resistant submarine pipeline concrete coating layer and preparation method thereof - Google Patents

High-strength corrosion-resistant submarine pipeline concrete coating layer and preparation method thereof Download PDF

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CN116283088B
CN116283088B CN202310183087.XA CN202310183087A CN116283088B CN 116283088 B CN116283088 B CN 116283088B CN 202310183087 A CN202310183087 A CN 202310183087A CN 116283088 B CN116283088 B CN 116283088B
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concrete
cementing material
strength
pipeline
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CN116283088A (en
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崔祎菲
屈士皓
艾威侠
刘梦华
张鹏
马衍轩
陈一鸣
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Qindao University Of Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • C04B14/386—Carbon
    • 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
    • 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
    • C04B7/14—Cements containing slag
    • 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
    • C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/06—Coatings characterised by the materials used by cement, concrete, or the like
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • 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
    • 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
    • C04B2111/24—Sea water resistance
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
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Abstract

The invention provides a high-strength corrosion-resistant submarine pipeline coating layer and a method for preparing a submarine pipeline with the coating layer. The coating layer consists of a framework and concrete coated outside the framework. The framework is a CFRP (carbon fiber) reinforcement cage, the concrete is ultra-high performance geopolymer concrete, and the CFRP reinforcement cage and the ultra-high performance geopolymer concrete are poured into a whole. The ultra-high performance geopolymer concrete adopts the cementing material to replace cement, and the composition of the cementing material, the proportion of the alkali-exciting agent and the cementing material and the water content are optimized, so that the remarkable improvement on the strength is realized, the excellent high temperature resistance and corrosion resistance are realized, and the maintenance cost in the later use process is reduced; meanwhile, the steel pipe has a certain weight, is beneficial to submarine immersed tube operation, and ensures the stability of the steel pipe during operation.

Description

High-strength corrosion-resistant submarine pipeline concrete coating layer and preparation method thereof
Technical Field
The invention belongs to the field of organic composite materials, relates to concrete for submarine oil and gas pipeline engineering, and in particular relates to ultra-high performance geopolymer concrete and application thereof in preparing submarine oil and gas pipeline cladding layers.
Background
In modern marine oil and gas transportation engineering, submarine pipeline engineering is widely used by virtue of the advantages of high oil transportation efficiency, low long-term maintenance cost and the like. However, due to the insufficient strength and durability of the conventional pipe cladding material, it is impossible to resist the strong corrosiveness of the marine environment, and over time, it is easy to cause pipe cracking, crude oil leakage, and even explosion accidents. Realizing high strength and durability of submarine pipeline cladding materials is a real problem to be solved urgently.
The geopolymer is a cementing material of an aluminum-oxygen-silicate amorphous network structure, which is formed by condensation polymerization of minerals and is mainly composed of ionic bonds and covalent bonds, is assisted by Van der Waals bonds, and is composed of silicon and aluminum oxide tetrahedra which are alternately bonded by shared oxygen. The hydration reaction of the geopolymer is a process that under the action of an alkaline excitant, the silicon oxygen bond and the aluminum oxygen bond are subjected to a cleavage-recombination reaction, and then the geopolymer with gelling property and solidification property is polymerized. The geopolymer cementing material product has the advantages of corrosion resistance, low thermal conductivity, good plasticity and the like, and is expected to be used for preparing a submarine oil and gas pipeline coating layer.
The ultra-high performance geopolymer concrete (UHPGC) is prepared by completely replacing common silicate cement with geopolymer cementing materials, and is a novel concrete with ultra-high strength, environmental protection and high cost performance. Compared with the traditional concrete, the concrete has more excellent corrosion resistance, in particular to chloride ion permeation resistance and sulfate erosion resistance; therefore, the durability in the marine environment is far superior to that of common concrete and common ultra-high performance concrete, and the concrete is suitable for being used in explosion-proof structural members and structures exposed in severe environments for a long time, such as oil and gas pipeline cladding layers. However, most of the ultra-high performance geopolymer concrete reported at present has strength not higher than 100Mpa, which cannot meet the requirements of submarine pipeline cladding materials. In addition, the traditional reinforced concrete structure is widely used in various buildings due to the excellent performance, but the reinforced concrete is extremely easy to rust and erode in a severe submarine environment, so that the problem of insufficient durability of the submarine pipeline cladding layer is further aggravated.
Therefore, how to prepare the high-strength corrosion-resistant submarine pipeline coating is a technical problem to be solved urgently, and related reports are not yet available at present.
Disclosure of Invention
Aiming at the problem of insufficient strength and durability of a submarine oil and gas pipeline in the prior art, the invention provides a submarine pipeline coating layer with high strength and corrosion resistance and a method for preparing a submarine pipeline with the coating layer. The high strength of the coating layer ensures the corrosion resistance of the submarine pipeline and the antiknock and heat resistance of the oil-gas steel pipe, so that the maintenance cost in the later use process is reduced; in addition, the ultra-high performance geopolymer concrete adopted by the coating layer realizes zero use of cement, is environment-friendly and has wide application prospect.
The technical scheme of the invention is as follows:
a composition for preparing ultra-high performance geopolymer concrete, which comprises the following components: 35-60 parts of cementing material, 2-4 parts of filling material, 30-60 parts of aggregate, 10-25 parts of alkali-exciting agent, 10-15 parts of water and a proper amount of steel fibers; the cementing material is slag, fly ash or slag-fly ash mixture, and the filling material is silica fume; the volume fraction of the steel fibers in the composition is 1-3%. When the cementing material contains slag (the cementing material is slag or slag-fly ash mixture), the composition also comprises 0.1-0.3 parts by weight of water reducer and 3-6 parts by weight of retarder.
Wherein the alkali-activated agent consists of sodium silicate and sodium hydroxide solution; the consumption of the alkali activator is 28-41 wt% of the consumption of the cementing material; wherein the mol ratio of the two excitants SiO 2/Na2 O is 2:1, the modulus of the water glass is 1.2-1.5, the alkali equivalent of the water glass is 5-9%, and the concentration of the sodium hydroxide solution is 10-16 mol/L. The amount of water in the composition is 23-27 wt% of the powdery solid raw material, and the powdery solid raw material comprises a cementing material and a filling material. The aggregate is quartz sand with granularity not more than 300 mu m, the water reducer is naphthalene-based high-efficiency water reducer, and the retarder is powdery borax.
Preferably, the slag is S95 slag, the fly ash is low-calcium first-grade fly ash, and the weight ratio of the slag to the fly ash in the mixture is (1.5-2.5): 1. the inventor finds that in the slag-fly ash mixture, the slag and the fly ash can mutually influence, if too much slag can cause the coagulation to be too fast, and too much fly ash can cause the slag to be contacted with alkali solution and cannot react; both of these conditions can lead to a decrease in the strength of the system after mixing.
An ultra-high performance geopolymer concrete prepared from the composition as described above; the ultra-high strength and good workability of the concrete are realized by regulating and controlling the chemical compositions of the exciting agent and the raw materials, and the compactness is regulated by a close packing theory, so that the ultra-high strength is realized. The preparation method comprises the following specific steps:
(1) Putting the cementing material, the filling material and the aggregate into a stirrer to be dried and stirred until the cementing material, the filling material and the aggregate are uniformly mixed, adding an aqueous solution of an alkali-exciting agent, a water reducing agent and a retarder to improve the working performance, and stirring until the materials are uniformly mixed. When the cementing material is fly ash, a water reducing agent and a retarder are not required to be added.
(2) And adding steel fibers in a stirring state to improve mechanical properties, and continuously stirring until the materials are uniformly mixed to obtain the concrete slurry.
(3) Pouring the concrete slurry into a mould, curing and removing the mould to obtain the ultra-high performance geopolymer concrete. Wherein, when the cementing material is S95 slag, the curing condition is that the curing is carried out for 28 days at normal temperature; when the cementing material is low-calcium first-grade fly ash, curing for 24-72 hours at 60-80 ℃, and then curing at normal temperature to the 7 th day; when the cementing material is a fly ash-slag mixture, the curing condition is that the curing is carried out for 28 days at normal temperature.
Preferably, when the cementing material is S95 slag, the curing condition is 10-40 ℃ for curing for 28 days; when the cementing material is a fly ash-slag mixture, the curing condition is 20-30 ℃ for curing for 28 days.
A submarine pipeline coating layer with high strength and corrosion resistance; consists of a framework and concrete coated outside the framework. The framework is a CFRP (carbon fiber) reinforcement cage, the concrete is ultra-high performance geopolymer concrete prepared as described above, and the CFRP reinforcement cage and the ultra-high performance geopolymer concrete are poured into a whole. CFRP ribs are arranged in the ultra-high performance geopolymer concrete, and on one hand, good bonding performance exists between the CFRP ribs and the concrete; on the other hand, compared with the steel bars, the FRP rib has the advantages of strong corrosion resistance, convenient construction, strong shock absorption and the like, and the CFRP rib has the most excellent strength and corrosion resistance in the FRP rib, and can be applied to a submarine pipeline cladding layer structure, so that the structural durability and the safety coefficient can be effectively improved.
Preferably, the CFRP reinforcement cage is of a cage-shaped structure formed by connecting annular longitudinal reinforcements surrounding a pipeline and strip-shaped stirrups vertically connected with the longitudinal reinforcements. The diameter of the stirrup is 8-12 mm, the diameter of the longitudinal stirrup is 12-16 mm, and the distance between adjacent stirrups or longitudinal stirrups is 100-200mm; the thickness of the geopolymer concrete is not less than 150mm.
The preparation method of the high-strength corrosion-resistant pipeline adopting the submarine pipeline coating layer comprises the following steps of:
(1) Preparing CFRP reinforcement cage: measuring the size of a pipeline, and preparing annular longitudinal bars and strip-shaped stirrups with matched sizes; the two are assembled outside the pipeline, specifically: firstly, assembling longitudinal ribs around a steel pipe annular array at certain intervals, then sleeving stirrups, and coating epoxy resin glue on the joints or adopting binding fixation to obtain the CFRP rib cage. The diameter of the stirrup is 8-12 mm, the diameter of the longitudinal stirrup is 12-16 mm, and the distance between adjacent stirrups or longitudinal stirrups is 100-200mm.
(2) Preparing concrete slurry: (a) Weighing 35-60 parts of cementing material, 2-4 parts of filling material, 30-60 parts of aggregate, 10-25 parts of alkali-activated agent, 0.1-0.3 part of water reducer, 3-6 parts of retarder, 10-15 parts of water and a proper amount of steel fiber according to a formula; (b) Putting the cementing material, the filling material and the aggregate into a stirrer to be dried and stirred until the cementing material, the filling material and the aggregate are uniformly mixed, adding an aqueous solution of an alkali-exciting agent, a water reducing agent and a retarder, and stirring until the materials are uniformly mixed; (c) And adding steel fibers in a stirring state, and continuously stirring until the steel fibers are uniformly mixed to obtain the concrete slurry. When the cementing material is fly ash, a water reducing agent and a retarder are not required to be added.
(3) Preparing a high-strength corrosion-resistant pipeline: pouring the concrete slurry obtained in the step (2) into a die internally provided with the CFRP reinforcement cage and the pipeline prepared in the step (1), and removing the die after curing to obtain the high-strength corrosion-resistant pipeline. Wherein the thickness of the geopolymer concrete is not less than 150mm.
The invention has the beneficial effects that:
(1) The invention provides ultra-high performance geopolymer concrete, which adopts cementing materials to replace cement, and realizes remarkable improvement on strength and unexpected technical effect by optimizing the composition of the cementing materials, the proportion of an alkali-exciting agent and the cementing materials and the water content.
(2) The invention provides the submarine oil gas pipeline coating layer prepared by the ultra-high performance geopolymer concrete, which realizes the antiknock and heat resistance of the oil gas steel pipe by utilizing the ultra-high strength of the concrete, has a certain weight, is beneficial to submarine pipe sinking operation and ensures the stability of the steel pipe during operation.
(3) The submarine oil-gas pipeline coating layer adopts the CFRP reinforcement cage as a framework, fully exerts the characteristics of high strength, corrosion resistance and fatigue resistance of the carbon fiber reinforcement, and has good properties of chlorine salt corrosion resistance and sulfate corrosion resistance, thereby solving the technical problem that the submarine pipeline cannot resist the strong corrosiveness of the marine environment.
Drawings
FIG. 1 is a cross-sectional view of a high strength corrosion resistant submarine pipeline cladding according to the present invention;
FIG. 2 is a three-dimensional cutaway view of a high strength corrosion resistant subsea conduit cladding according to the present invention;
In the figure, steel pipes, 2 CFRP reinforcement cages and 3 ultrahigh-performance ground polymer concrete.
Detailed Description
The invention is further illustrated below with reference to examples.
Example 1: preparation of high-strength corrosion-resistant submarine oil-gas pipeline by taking slag as cementing material
(1) Preparing CFRP reinforcement cage: measuring the size of a pipeline, and preparing annular longitudinal bars and strip-shaped stirrups with matched sizes; both are assembled outside the pipe. The method comprises the following steps: firstly, assembling longitudinal ribs around a steel pipe annular array at certain intervals, then sleeving stirrups, and coating epoxy resin glue on the joints or adopting binding fixation to obtain the CFRP rib cage. The diameter of the stirrup is 10mm, and the diameter of the longitudinal rib is 16mm; the interval of adjacent stirrups is 150mm, and the interval of adjacent longitudinal ribs is 150mm.
(2) Preparing concrete slurry:
(a) 35 parts of S95 slag, 2 parts of silica fume, 60 parts of aggregate, 10 parts of alkali-activator (the amount of the alkali-activator is 28wt% of that of a cementing material), 0.1 part of water reducer, 3 parts of retarder, 10 parts of water (the amount of water is 27wt% of that of a powdery solid raw material) and 3% of steel fiber by volume fraction are weighed according to a formula. Wherein the alkali-activated agent consists of sodium silicate and sodium hydroxide solution; the molar ratio of the two excitants SiO 2/Na2 O is 2:1, the modulus of the water glass is 1.5, the alkali equivalent of the water glass is 9%, and the concentration of the sodium hydroxide solution is 10mol/L. The aggregate is quartz sand with granularity not more than 300 mu m, the water reducer is naphthalene-based high-efficiency water reducer, and the retarder is powdery borax.
(B) Putting the cementing material, the filling material and the aggregate into a stirrer to be dried and stirred until the cementing material, the filling material and the aggregate are uniformly mixed, adding an aqueous solution of an alkali-exciting agent, a water reducing agent and a retarder, and stirring until the materials are uniformly mixed;
(c) And adding steel fibers in a stirring state, and continuously stirring until the steel fibers are uniformly mixed to obtain the concrete slurry.
(3) Preparing a high-strength corrosion-resistant pipeline: pouring the concrete slurry obtained in the step (2) into a die internally provided with the CFRP reinforcement cage and the pipeline prepared in the step (1), and removing the die after curing to obtain the high-strength corrosion-resistant pipeline. Wherein the thickness of the geopolymer concrete is 150mmmm.
The specific operation is as follows: and (3) integrally placing the CFRP reinforcement cage and the steel pipe manufactured in the step (1) at a place where concrete is cured, sealing the bottom, preventing slurry from flowing out during pouring, and arranging an annular mold (internally smearing a mold release agent) around the CFRP reinforcement cage and the steel pipe to ensure the shape and thickness of the concrete. And (3) pouring the concrete slurry prepared in the step (2) between a steel pipe and a die, and vibrating for compaction. After pouring, the top end is smoothed and covered with a film, the curing is carried out until the age, and the die is removed, so that the high-strength corrosion-resistant submarine oil and gas pipeline is obtained. The cross-sectional structure of the oil and gas pipeline is shown in figure 2.
After demoulding, the material is cured for 28 days at normal temperature, and then compression test and durability test are carried out, wherein the concrete method is as follows:
(1) The compression test method comprises the following steps: ① When the time reaches the age, taking out from the maintenance place, and checking the size and the shape; ② The test piece is placed in the center of an upper bearing plate and a lower bearing plate of the testing machine, and the non-molding surface is contacted with the upper bearing plate and the lower bearing plate; ③ Starting the testing machine, and uniformly loading at the speed of 0.5 MPa/s; ④ When the test piece is damaged, stopping the test, taking out the test piece, reading the numerical value, and analyzing and calculating according to the formula (1).
Wherein, f cc: compressive strength (MPa) of concrete cube test piece, F: test piece breaking load (N), a: pressure area of test piece (mm 2).
(2) Durability test method:
① High temperature resistance test: and (3) carrying out high temperature resistance test by using a high temperature furnace, sequentially setting 200 ℃,400 ℃, 600 ℃, 800 ℃, observing appearance and quality changes of the test block, and testing and calculating the compression strength ratio of the test block at different temperatures and 20 ℃.
② Chlorine salt corrosion resistance test: and (3) coating epoxy resin on the periphery of the concrete test block (ensuring one-dimensional transmission of the chloride salt solution), immersing the non-coated epoxy resin part in the chloride salt solution after airing (placing two wood sticks below to ensure a gap), cutting along the transmission direction after long-term immersion, spraying a silver nitrate solution color development indicator, and observing the penetration depth.
③ Sulfate corrosion resistance test: the concrete test block is completely placed into sulfate solution to be soaked for a long time, the compressive strength after soaking is tested, and the compressive strength is compared with the compressive strength of curing 28d, so that the strength loss is calculated.
According to the compression test result, the compressive strength of the test piece was 126MPa. In the durability test, the high temperature resistance test shows that the sample has cracking phenomenon at 200 ℃, and the cracking is aggravated along with the temperature rise, and the slurry is separated from the aggregate at 800 ℃, so that the mass loss exceeds 7%. At the same time, as the temperature increases, the compressive strength ratio increases slowly and then decreases, and reaches a peak value at 200 ℃. And (3) performing a chlorine salt corrosion resistance test on the test piece after the high temperature, and finding that the corrosion depth is about 11 mm. The sulfate erosion resistance test is carried out, and the loss of the strength of the composite material exceeds 20% due to the high temperature and the sulfate composite action, which shows that cracks are formed after the high temperature, and the sulfate erosion is carried out to have a larger influence on the strength.
Example 2: preparation of high-strength corrosion-resistant submarine oil-gas pipeline by taking slag as cementing material
Unlike in the case of example 1,
(1) Preparing CFRP reinforcement cage: the diameter of the stirrup is 12mm, the diameter of the longitudinal stirrup is 12mm, and the distance between adjacent stirrups or longitudinal stirrups is 150mm.
(2) Preparing concrete slurry:
60 parts of S95 slag, 4 parts of silica fume, 30 parts of aggregate, 25 parts of alkali-activator (the amount of the alkali-activator is 41 percent of the amount of the cementing material), 0.3 part of water reducer, 6 parts of retarder, 15 parts of water (the amount of the water is 23 percent of the amount of the powdery solid raw material) and 3 percent of steel fiber by volume fraction are weighed according to a formula. Wherein the alkali-activated agent consists of sodium silicate and sodium hydroxide solution; the molar ratio of the two excitants SiO 2/Na2 O is 2:1, the modulus of the water glass is 1.2, the alkali equivalent of the water glass is 5%, and the concentration of sodium hydroxide solution is 16mol/L. The aggregate is quartz sand with granularity not more than 300 mu m, the water reducer is naphthalene-based high-efficiency water reducer, and the retarder is powdery borax.
(3) Preparing a high-strength corrosion-resistant pipeline: the thickness of the geopolymer concrete is 150mm.
After demoulding, the sample is cured for 28 days at normal temperature, and the compression strength of the sample is 141MPa. The high temperature resistance test is carried out, the cracking phenomenon is found to occur at 200 ℃, the cracking is increased along with the temperature rise, the slurry is separated from the aggregate at 800 ℃, the mass loss is 8%, the compression strength ratio is slowly increased along with the temperature rise and then reduced, the peak value is reached at 200 ℃, and the peak value is almost equal to the value at 20 ℃. The chlorine salt corrosion resistance test was conducted, and the corrosion depth was found to be about 12 mm. The sulfate etch resistance test was performed and the strength loss was found to be about 12%.
Example 3: preparation of high-strength corrosion-resistant submarine oil-gas pipeline by taking slag-fly ash mixture as cementing material
Unlike in the case of example 1,
(1) Preparing CFRP reinforcement cage: the diameter of the stirrup is 10mm, the diameter of the longitudinal bar is 14mm, and the distance between adjacent stirrups or longitudinal bars is 150mm.
(2) Preparing concrete slurry:
According to the formula, 50 parts of cementing material, 3 parts of silica fume, 32 parts of aggregate, 15 parts of alkali-activator (the dosage of the alkali-activator is 30 percent of that of the cementing material), 0.1 part of water reducer, 3 parts of retarder, 12 parts of water (the dosage of the water is 23 percent of that of powdery solid raw material) and 1-3 percent of steel fiber by volume are weighed. Wherein the cementing material is a slag-fly ash mixture, and the weight ratio of slag to fly ash in the mixture is 1.5:1. the alkali-activated agent consists of sodium silicate and sodium hydroxide solution; the molar ratio of the two excitants SiO 2/Na2 O is 2:1, the modulus of the water glass is 1.5, the alkali equivalent of the water glass is 7%, and the concentration of the sodium hydroxide solution is 12mol/L. The aggregate is quartz sand with granularity not more than 300 mu m, the water reducer is naphthalene-based high-efficiency water reducer, and the retarder is powdery borax.
(3) Preparing a high-strength corrosion-resistant pipeline: the thickness of the geopolymer concrete is 150mm.
After demoulding, the sample is cured for 28 days at normal temperature, and the compression strength of the sample is 126MPa. The high temperature resistance test is carried out, the cracking phenomenon is found to occur at 400 ℃, a large number of fine cracks are formed at 800 ℃, the slurry is separated from the aggregate, the mass loss is more than 7%, the compression strength ratio is slowly increased and then reduced along with the temperature rise, the peak value is reached at 400 ℃, and the peak value is about 1.1 times of that at 20 ℃. The chlorine salt corrosion resistance test was conducted, and the corrosion depth was found to be about 11 mm. The sulfate etch resistance test was performed and the strength loss was found to be about 10%.
Example 4: preparation of high-strength corrosion-resistant submarine oil-gas pipeline by taking slag-fly ash mixture as cementing material
Unlike in the case of example 1,
(1) Preparing CFRP reinforcement cage: the diameter of the stirrup is 12mm, the diameter of the longitudinal bar is 16mm, and the distance between adjacent stirrups or longitudinal bars is 200mm.
(2) Preparing concrete slurry:
60 parts of cementing material, 4 parts of silica fume, 36 parts of aggregate, 25 parts of alkali-activator (the dosage of the alkali-activator is 41wt% of that of the cementing material), 0.1 part of water reducer, 4 parts of retarder, 15 parts of water (the dosage of the water is 23wt% of that of powdery solid raw material) and 3% of steel fiber by volume fraction are weighed according to a formula. The cementing material is a mixture of S95 slag and low-calcium first-grade fly ash, wherein the weight ratio of slag to fly ash in the mixture is 2.5:1. the alkali-activated agent consists of sodium silicate and sodium hydroxide solution; the molar ratio of the two excitants SiO 2/Na2 O is 2:1, the modulus of the water glass is 1.3, the alkali equivalent of the water glass is 3%, and the concentration of the sodium hydroxide solution is 16mol/L. The aggregate is quartz sand with granularity not more than 300 mu m, the water reducer is naphthalene-based high-efficiency water reducer, and the retarder is powdery borax.
(3) Preparing a high-strength corrosion-resistant pipeline: the thickness of the geopolymer concrete is 150mm.
After demoulding, the sample is cured for 28 days at normal temperature, and the compression strength of the sample is 128MPa. Carrying out a high temperature resistance test to find that cracking occurs at 400 ℃, a large number of fine cracks occur at 800 ℃ and the slurry is separated from the aggregate, and the mass loss exceeds 9%; the compressive strength ratio increases slowly with increasing temperature and then decreases, and reaches a peak at 400 c, which is about 1.1 times that at 20 c. The chlorine salt corrosion resistance test was conducted, and the corrosion depth was found to be about 11 mm. The sulfate etch resistance test was performed and found to have about 8% strength loss.
Example 5: preparation of high-strength corrosion-resistant submarine oil-gas pipeline by using fly ash as cementing material
Unlike in the case of example 1,
(1) Preparing CFRP reinforcement cage: the diameter of the stirrup is 8mm, the diameter of the longitudinal bar is 12mm, and the distance between adjacent stirrups or longitudinal bars is 150mm.
(2) Preparing concrete slurry:
(a) 45 parts of low-calcium first-grade fly ash, 2 parts of silica fume, 53 parts of aggregate, 15 parts of alkali-activator (the amount of the alkali-activator is 33wt% of that of a cementing material), 11 parts of water (the amount of the water is 24wt% of that of a powdery solid raw material) and steel fibers with the volume fraction of 3% are weighed according to a formula. Wherein the alkali-activated agent consists of sodium silicate and sodium hydroxide solution; the molar ratio of the two excitants SiO 2/Na2 O is 2:1, the modulus of the water glass is 1.5, the alkali equivalent of the water glass is 9%, and the concentration of the sodium hydroxide solution is 12mol/L. The aggregate is quartz sand with granularity not more than 300 mu m.
(B) Putting the cementing material, the filling material and the aggregate into a stirrer to be dried and stirred until the cementing material, the filling material and the aggregate are uniformly mixed, adding the alkali-exciting agent, and stirring until the mixture is uniformly mixed.
(3) Preparing a high-strength corrosion-resistant pipeline: the thickness of the geopolymer concrete is 200mm.
After demolding, curing for 24 hours at the temperature of 60 ℃, and curing at normal temperature to the 7 th day, and performing a compression test, wherein the result shows that the compression strength of the sample is 122MPa. Carrying out a high temperature resistance test to find that cracking occurs at 600 ℃ and a large number of tiny cracks occur at 800 ℃ and the mass loss is 1%; the compressive strength ratio was increased and decreased with increasing temperature and reached a peak at 600c, which was about 1.5 times that at 20 c. The chlorine salt corrosion resistance test was conducted, and the corrosion depth was found to be about 14 mm. The sulfate etch resistance test was performed and found to have about 5% strength loss.
Example 6: preparation of high-strength corrosion-resistant submarine oil-gas pipeline by using fly ash as cementing material
Unlike in the case of example 1,
(1) Preparing CFRP reinforcement cage: the diameter of the stirrup is 10mm, the diameter of the longitudinal bar is 16mm, and the distance between adjacent stirrups or longitudinal bars is 200mm.
(2) Preparing concrete slurry:
(a) 60 parts of low-calcium first-grade fly ash, 4 parts of silica fume, 36 parts of aggregate, 25 parts of alkali-activator (the amount of the alkali-activator is 41wt% of that of a cementing material), 15 parts of water (the amount of the water is 23wt% of that of a powdery solid raw material) and steel fibers with the volume fraction of 3% are weighed according to a formula. Wherein the alkali-activated agent consists of sodium silicate and sodium hydroxide solution; the molar ratio of the two excitants SiO 2/Na2 O is 2:1, the modulus of the water glass is 1.2, the alkali equivalent of the water glass is 7%, and the concentration of sodium hydroxide solution is 16mol/L. The aggregate is quartz sand with granularity not more than 300 mu m.
(B) Putting the cementing material, the filling material and the aggregate into a stirrer to be dried and stirred until the cementing material, the filling material and the aggregate are uniformly mixed, adding the alkali-exciting agent, and stirring until the mixture is uniformly mixed.
(3) Preparing a high-strength corrosion-resistant pipeline: the thickness of the geopolymer concrete is 150mm.
After demolding, curing for 72 hours at the temperature of 80 ℃, and curing at normal temperature to the 7 th day, and performing a compression test, wherein the result shows that the compression strength of the sample is 121MPa. Carrying out a high temperature resistance test to find that cracking occurs at 600 ℃ and a small amount of tiny cracks occur at 800 ℃, and the mass loss is 2%; the compressive strength ratio rises and levels off with increasing temperature and peaks at 1200 c, which is about 1.5 times that at 20 c. The chlorine salt corrosion resistance test was conducted, and the corrosion depth was found to be about 10 mm. The sulfate attack resistance test was performed and found to have a strength loss of 1%.
The performance parameters of the high-strength corrosion-resistant submarine oil and gas pipelines prepared in examples 1-6 are summarized and shown in Table 1.
Table 1: performance parameters of high-strength corrosion-resistant subsea oil and gas pipelines prepared in examples 1-6
As can be seen from Table 1, the high-strength corrosion-resistant submarine oil and gas pipeline prepared by the embodiments 1-6 of the application has the compressive strength of 121-141MPa at normal temperature, belongs to ultra-high-strength concrete, and meets the requirement of antiknock performance. In the high temperature resistance test, the mass loss of the high temperature resistance test is 1-9%, and the peak temperature of the compression strength ratio is 200-1200, which shows that the pipeline prepared by the embodiment of the application has excellent high temperature resistance, can be used for the pipeline transportation of common liquid and gas, and can meet the requirement of the pipeline transportation of extremely high temperature liquid and gas under certain optimized formula conditions. In the corrosion resistance test, the corrosion depth of the chlorine salt is 10-14mm, the corrosion strength loss of the sulfate is 1-20%, and the pipeline prepared by the embodiment of the application has strong corrosion resistance in marine environment and is suitable for marine oil and gas pipelines.
Furthermore, as can be seen from table 1, the strength of the concrete changes with the composition of the cementitious material when the proportions of the components are similar. Wherein, the strength is higher when using pure slag, and the strength is second when using slag-fly ash combination, and the strength is slightly lower when using pure fly ash. For the high temperature resistance, the crack development of the cementing material is aggravated with the temperature rise, the compressive strength is improved and reduced with the temperature rise, and the mass loss rate is almost consistent. When the pure fly ash is used as a cementing material, compared with other examples, the chlorine salt corrosion resistance of the fly ash is slightly lower, but the chlorine salt corrosion resistance of the fly ash is not far different, and the sulfate corrosion resistance of the fly ash is strongest. In summary, the pure slag is used as the cementing material and has better mechanical properties, and the pure fly ash is used as the cementing material and has better high temperature resistance and marine environment main corrosion resistance.
In summary, the high-strength corrosion-resistant submarine oil-gas pipeline is prepared by casting the CFRP reinforcement cage and the ultra-high performance geopolymer concrete into a whole, the compressive strength of the oil-gas pipeline is obviously improved compared with the prior art, and the oil-gas pipeline has excellent corrosion resistance (chlorine salt corrosion resistance and sulfate corrosion resistance), meets the requirements of high strength and corrosion resistance of submarine pipeline cladding materials, and has wide application prospect.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features can be replaced equally; such modifications and substitutions do not depart from the spirit of the invention.

Claims (7)

1. The utility model provides a submarine pipeline coating of high strength, corrosion-resistant, by skeleton and cladding outside the skeleton ultra-high performance ground polymer concrete composition, its characterized in that: the skeleton is a CFRP reinforcement cage, and the ultra-high performance geopolymer concrete consists of the following components: 35-60 parts of cementing material, 2-4 parts of filling material, 30-60 parts of aggregate, 10-25 parts of alkali-exciting agent, 10-15 parts of water and a proper amount of steel fibers; the cementing material is slag, fly ash or slag-fly ash mixture, and the filling material is silica fume; the volume fraction of the steel fiber in the composition is 1-3%; the alkali-activated agent consists of sodium silicate and sodium hydroxide solution; the consumption of the alkali-activated agent is 28-41wt% of the consumption of the cementing material; the CFRP reinforcement cage and the ultra-high performance geopolymer concrete are poured into a whole.
2. The high strength, corrosion resistant submarine pipeline cladding according to claim 1, wherein: when the cementing material contains slag, the composition also comprises 0.1-0.3 part by weight of water reducer and 3-6 parts by weight of retarder, wherein the water reducer is naphthalene high-efficiency water reducer.
3. The high strength, corrosion resistant submarine pipeline cladding according to claim 2, wherein: the cementing material is S95 slag, low-calcium first-grade fly ash or a mixture of S95 slag and low-calcium first-grade fly ash; the weight ratio of the S95 slag to the low-calcium first-grade fly ash in the mixture is (1.5-2.5): 1.
4. A high strength, corrosion resistant submarine pipeline cladding according to claim 3, wherein: in the alkali excitant, the mol ratio of the two excitants SiO 2/Na2 O is 2:1, the modulus of water glass is 1.2-1.5, the alkali equivalent of the water glass is 5-9%, and the concentration of sodium hydroxide solution is 10-16 mol/L.
5. A high strength, corrosion resistant submarine pipeline cladding according to claim 3, wherein: the water is 23-27wt% of powdery solid raw materials, and the powdery solid raw materials comprise cementing materials and filling materials; the aggregate is quartz sand with granularity not more than 300 mu m, and the retarder is powdery borax.
6. The high strength, corrosion resistant submarine pipeline cladding according to any one of claims 1 to 5, wherein: the CFRP reinforcement cage is of a cage-shaped structure formed by connecting annular longitudinal reinforcements surrounding a pipeline and strip-shaped stirrups vertically connected with the longitudinal reinforcements; the diameter of the stirrup is 8-12 mm, and the diameter of the longitudinal bar is 12-16 mm; the distance between the adjacent stirrups or longitudinal ribs is 100-200mm; the thickness of the ultra-high performance geopolymer concrete is not less than 150mm.
7. A preparation method of a high-strength corrosion-resistant submarine oil and gas pipeline comprises the following steps:
(1) Preparing CFRP reinforcement cage: measuring the size of a pipeline, preparing annular longitudinal ribs and strip-shaped stirrups, assembling the annular longitudinal ribs and the strip-shaped stirrups on the outer side of the pipeline, and fixing the joint to obtain a CFRP reinforcement cage;
(2) Preparing concrete slurry: (a) Weighing 35-60 parts of cementing material, 2-4 parts of filling material, 30-60 parts of aggregate, 10-25 parts of alkali-activated agent, 0.1-0.3 part of water reducer, 3-6 parts of retarder, 10-15 parts of water and a proper amount of steel fiber according to a formula; when the cementing material is fly ash, a water reducing agent and a retarder are not required to be added; (b) Putting the cementing material, the filling material and the aggregate into a stirrer to be dried and stirred until the cementing material, the filling material and the aggregate are uniformly mixed, adding an aqueous solution of an alkali-exciting agent, a water reducing agent and a retarder, and stirring until the materials are uniformly mixed; (c) Adding steel fibers in a stirring state, and continuously stirring until the steel fibers are uniformly mixed to obtain concrete slurry; the cementing material is slag, fly ash or slag-fly ash mixture, and the filling material is silica fume; the volume fraction of the steel fiber in the composition is 1-3%;
(3) Preparing a high-strength corrosion-resistant submarine oil gas pipeline: placing the CFRP reinforcement cage and the steel tube manufactured in the step (1) in a concrete curing place integrally, sealing the bottom, preventing slurry from flowing out during pouring, arranging an annular mold around the CFRP reinforcement cage and the steel tube, and ensuring the shape and thickness of the concrete; pouring the concrete slurry prepared in the step (2) between a steel pipe and a die, and vibrating for compaction; after pouring, the top end is smoothed and covered with a film, the curing is carried out until the age, and the die is removed, so that the high-strength corrosion-resistant submarine oil and gas pipeline is obtained.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207260440U (en) * 2017-07-04 2018-04-20 东莞理工学院 A kind of FRP pipes seawater sea sand regenerates self-compacting concrete environment protection architecture component
CN111620664A (en) * 2020-05-29 2020-09-04 广州大学 Non-cement-based ultrahigh-performance concrete and preparation method thereof

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CN208844550U (en) * 2018-08-22 2019-05-10 沈阳建筑大学 A kind of FRP pipe-PHC tubular pole interlayer concrete filled composite structure
CN113565264A (en) * 2021-05-20 2021-10-29 武汉大学 FRP-UHPFRC-concrete composite column

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN207260440U (en) * 2017-07-04 2018-04-20 东莞理工学院 A kind of FRP pipes seawater sea sand regenerates self-compacting concrete environment protection architecture component
CN111620664A (en) * 2020-05-29 2020-09-04 广州大学 Non-cement-based ultrahigh-performance concrete and preparation method thereof

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