CN113846801A - FRP (fiber reinforced plastic) tube alkali-activated slag-based seawater coral aggregate concrete column and preparation method thereof - Google Patents
FRP (fiber reinforced plastic) tube alkali-activated slag-based seawater coral aggregate concrete column and preparation method thereof Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
-
- 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
-
- 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
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/66—Sealings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/24—Sea water resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/26—Corrosion of reinforcement resistance
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- Manufacturing & Machinery (AREA)
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Abstract
The invention provides an FRP (fiber reinforced plastic) tube alkali-activated slag-based seawater coral aggregate concrete column and a preparation method thereof. The alkali-activated slag-based seawater coral aggregate concrete fully utilizes specific seawater and waste coral in the offshore island region as raw materials, and alkali-activated slag slurry with a compact slurry structure and good durability is used as a cementing material to improve the bottleneck problems of low strength, insufficient durability and the like of the traditional coral aggregate concrete. Meanwhile, the anti-corrosion FRP pipe is adopted to restrain the concrete, so that the coral aggregate concrete is in a three-dimensional stress state, and the bearing capacity, the ductility and the anti-seismic performance of the coral aggregate concrete member can be effectively improved. The invention realizes the effective utilization of resources and has the advantages of environmental protection and the like by adopting the strong combination of the high-durability alkali-activated cementing material and the corrosion-resistant FRP.
Description
Technical Field
The invention belongs to the technical field of marine building engineering materials, and particularly relates to an FRP (fiber reinforced plastic) tube alkali-activated slag-based seawater coral aggregate concrete column and a preparation method thereof.
Background
The coral aggregate concrete is novel marine engineering concrete prepared by fully utilizing sea resources such as seawater, sea sand or coral reef sand, coral coarse aggregate and the like, can relieve the problem of lack of traditional building materials in the offshore island and reef areas, can avoid adverse effects on the progress of marine engineering projects due to weather changes or transportation, and is suitable for construction of engineering infrastructures in the offshore island and reef areas.
However, the coral aggregates have the characteristics of light weight, multiple pores, low cylinder pressure strength, multiple internal defects, high water absorption and the like, so that the prepared cement-based coral aggregate concrete generally has the bottleneck problems of high porosity, low strength, small elastic modulus, insufficient impermeability and durability and the like. At present, the mechanical property and durability of the coral aggregate concrete are improved by reducing the water-cement ratio, increasing the using amount of a cementing material, adding a mineral admixture, fibers and the like, but researches find that the improvement effect of the conventional methods is not obvious, so that the popularization and application of the coral aggregate concrete in the construction of ocean engineering infrastructures are greatly limited. Meanwhile, the high chloride content in the seawater and coral aggregates easily causes corrosion and expansion of the internal reinforcements of the structure, and seriously affects the bearing capacity, durability and service life of the marine concrete and the structure thereof. Although the engineering industry proposes to adopt rust-proof measures such as adding rust inhibitor and coating steel bar treatment, too complicated process treatment and expensive cost are not practical for the open sea island engineering lacking machinery and materials.
In addition, the cement is used as a cementing material in the traditional coral aggregate concrete, and the cement can cause energy consumption and environmental problems in the production process and is not beneficial to the development of green and low carbon.
In the face of increasing ocean engineering infrastructure construction, it is necessary to reasonably utilize ocean resources to develop novel marine concrete materials to optimize resource management and reduce construction cost, and a novel reinforced concrete structure with localized raw materials, low cost, high environmental protection, high strength and high durability is developed.
Disclosure of Invention
The invention aims to provide an FRP (fiber reinforced plastic) tube alkali-activated slag-based seawater coral aggregate concrete column and a preparation method thereof, which are used for solving the bottleneck problems of inconvenient material taking, insufficient bearing capacity, poor durability and the like in the construction of offshore island engineering and have the advantages of low carbon, high efficiency, environmental friendliness and the like.
An FRP pipe alkali-activated slag-based seawater coral aggregate concrete column comprises:
FRP pipes;
the FRP rib cage is embedded in the FRP pipe and comprises a plurality of FRP longitudinal ribs axially distributed along the FRP pipe, and the adjacent FRP longitudinal ribs are connected through FRP stirrups;
and the alkali-activated slag-based seawater coral aggregate concrete is filled in a space formed by the FRP pipe and the FRP rib cage.
Preferably, the FRP pipe is a wound pipe, and has a rectangular or circular cross section; the FRP stirrups are square or spiral, and the distance between every two adjacent FRP stirrups is not less than 50 mm; the diameter of the FRP longitudinal bar is 8-16 mm.
Preferably, the FRP stirrup and the FRP longitudinal bar are connected by a corrosion-resistant cable tie.
Preferably, the FRP pipe is one or more of BFRP, CFRP, GFRP or AFRP; the FRP stirrups are one or more of BFRP, CFRP, GFRP or AFRP; the FRP longitudinal ribs are one or more of BFRP, CFRP, GFRP or AFRP.
Preferably, the alkali-activated slag-based seawater coral aggregate concrete is composed of slagMixing the alkaline activator, coral aggregate and seawater; wherein the coral aggregate is a mixture of coral reef sand and coral reef stone; the alkali activator is prepared from Na2SiO3Powder and flake NaOH.
Preferably, the slag is granulated blast furnace slag micropowder S95; the alkali activator is composed of powdered Na2SiO3Mixing flake NaOH and seawater; wherein the modulus of the alkali activator is 1.2-1.6, and the alkali content is 4-8%.
Preferably, the activated slag-based seawater coral aggregate concrete comprises the following components in proportion in each cubic concrete: slag 450-550 kg; 650 kg of coral reef sand and 850 kg of coral reef sand; 550 kg of coral reef and 700 kg of coral reef; na (Na)2SiO345-90 kg of powder; 15-30 kg of flake NaOH and 330 kg of seawater.
Preferably, the coral aggregates are derived from waste coral aggregates produced by port dredging, natural weathering and canal excavation, the seawater is derived from natural seawater, and the water-to-gel ratio is preferably 0.55-0.65.
A preparation method of an FRP tube alkali-activated slag-based seawater coral aggregate concrete column comprises the following steps:
(1) preparing an FRP pipe and an FRP rib cage:
binding adjacent FRP stirrups through the FRP longitudinal reinforcements until all the FRP stirrups are bound to form an FRP reinforcement cage, and then sleeving the FRP reinforcement cage in the FRP pipe for later use;
(2) preparing an alkaline activator:
mixing Na2SiO3Pouring the powder into seawater with half of the total water consumption, stirring, adding flake NaOH into the mixed solution, and continuously stirring until Na2SiO3Completely dissolving the powder and NaOH, sealing the prepared alkaline hair-growing agent solution and cooling for later use;
(3) preparing alkali-activated slag-based seawater coral aggregate concrete:
placing the weighed coral reef sand and coral reef in a stirrer, dry-stirring for 1-3 min to uniformly mix the coral reef sand and the coral reef, then pouring seawater with half of the total water consumption, and stirring for 2-4 min to pre-wet coral aggregate;
then pouring the slag into the mixture, and stirring for 1-3 min to fully disperse the mixture;
finally, pouring the alkali-activated agent solution prepared in the step (2) into the mixture, and continuously stirring for 2-4 min to obtain the alkali-activated slag-based seawater coral aggregate concrete;
(4) pouring FRP pipe alkali-activated slag-based seawater coral aggregate concrete column
And (3) filling the alkali-activated slag-based seawater coral aggregate concrete prepared in the step (3) into the FRP pipe in the step (1), and obtaining the FRP pipe alkali-activated slag-based seawater coral aggregate concrete column after the completion of maintenance.
Compared with the prior art, the invention has the advantages that:
(1) the FRP tube alkali-activated slag-based seawater coral aggregate concrete column prepared by the invention is prepared from local materials, and fully utilizes special resources of seawater, waste coral aggregates and the like in the island region of the open sea, so that the problem of shortage of traditional building materials in the island region is relieved, adverse effects on project progress caused by transportation or weather change are avoided, and the construction cost and the construction period are greatly reduced. In addition, the coral aggregates used for preparing the concrete can be obtained from waste coral fragments generated by natural weathering, channel excavation, port dredging and the like, the natural ecological environment of the coral reef cannot be damaged, and the occupation of the waste coral fragments on the scarce island space can be reduced to a certain extent.
(2) The concrete filled in the FRP pipe adopts the high-strength and high-durability alkali-activated slag cementing material to replace the traditional cement-based material, thereby effectively reducing the energy consumption and CO in the cement production process2And the purposes of environmental protection and sustainable development are achieved. Meanwhile, the alkali-activated cementing material slurry has a compact structure and the capability of fixing chloride ions, and the characteristic enhances the seawater erosion resistance of the traditional coral aggregate concrete, thereby effectively improving the serviceability and durability of the marine concrete and the structure thereof.
(3) The concrete used in the invention takes the alkali-activated slag slurry with compact slurry as a cementing material, which can effectively fill the pores on the surface of the coral aggregate, thereby achieving the purpose of improving the microstructure of the aggregate-slurry interface. The improved interface microstructure delays the development and propagation of cracks in the loading process and can effectively enhance the compressive strength and the tensile strength of the coral aggregate concrete. Meanwhile, the reinforced characteristics can also improve the bonding performance between the FRP pipe and the FRP rib and coral aggregate concrete, thereby effectively enhancing the coordinated deformation capacity of the FRP and the coral concrete.
(4) According to the invention, the FRP pipe is adopted to restrain the coral aggregate concrete, so that the defects of large brittleness, low strength and the like of the coral aggregate can be effectively alleviated, and meanwhile, the bearing and deformation capacities of the coral aggregate concrete and the components thereof can be greatly enhanced by embedding the FRP reinforcement cage in the FRP pipe.
(5) The corrosion-resistant FRP is adopted to replace the traditional steel bar, so that the problem of corrosion and expansion of the steel pipe and the steel bar caused by corrosion of chloride ions can be effectively avoided; meanwhile, the alkali-activated cementing material has good erosion resistance and impermeability, and the strong combination of the two corrosion-resistant materials greatly improves the durability and service life of the marine concrete member, and is suitable for high-temperature, high-humidity and high-salt marine environments.
Drawings
FIG. 1 is a flow chart of preparation of alkali-activated slag-based seawater coral aggregate concrete;
FIG. 2 is a schematic cross-sectional view of an FRP pipe alkali-activated slag-based seawater coral aggregate concrete column of the present invention.
FIG. 3 is a schematic cross-sectional view of a FRP pipe alkali-activated slag-based seawater coral aggregate concrete square column in the invention.
Wherein, the concrete comprises 1-FRP pipe, 2-FRP stirrup, 3-FRP longitudinal bar and 4-alkali activated slag-based seawater coral aggregate concrete.
Detailed Description
The present invention will now be described in more detail with reference to the accompanying schematic drawings, in which preferred embodiments of the invention are shown, it being understood that one skilled in the art may modify the invention herein described while still achieving the advantageous effects of the invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
The FRP tube alkali-activated slag-based seawater coral aggregate concrete column shown in figures 2 to 3 comprises an outer-layer FRP tube 1, an FRP hoop 2 and an FRP longitudinal rib 3 which are embedded inside the FRP tube, and alkali-activated slag-based seawater coral aggregate concrete 4 filled in the FRP tube 1.
Wherein, the section of the FRP pipe 1 can be a rectangular or circular winding pipe, and the thickness of the fiber layer is 5 mm; the FRP stirrups 2 are square or spiral stirrups, and the spacing is more than or equal to 50 mm; the diameter of the FRP longitudinal rib 3 is 8-16mm, and the FRP hoop rib 2 and the FRP longitudinal rib 3 are prepared into an FRP rib cage by adopting a corrosion-resistant ribbon; the FRP pipe 1, the FRP hoop reinforcement 2 and the FRP longitudinal reinforcement 3 can be one or more of BFRP, CFRP, GFRP or AFRP.
Wherein the alkali-activated slag-based seawater coral aggregate concrete 4 is prepared by mixing S95 granulated blast furnace slag, an alkali activator, coral reef sand and coral reef with seawater. The alkaline activator is powdered instant Na2SiO3（59.6 wt% SiO2And 21.6 wt% Na2O), flake NaOH, and seawater to make excitant modulus (SiO)2/Na2O) is 1.2, and the alkali content (Na)2The ratio of the O content to the amount of the binding material) is 6%; the coral aggregates used are waste coral aggregates generated by port dredging, natural weathering and channel digging, the coral reef sand is fine sand, the particle size of the coarse aggregates is 5-25mm natural original state or crushed coral reef, and the volume sand rate is 55%; the seawater is prepared according to the standard, and the water-to-glue ratio is 0.60.
As shown in figure 1, the preparation method of the FRP pipe alkali-activated slag-based seawater coral aggregate concrete column mainly comprises the following steps:
(1) preparing FRP pipe and FRP reinforcement cage
The section of the FRP pipe 1 can be square or round, wherein the FRP stirrups embedded in the square FRP pipe are preferably rectangular stirrups, and the FRP stirrups embedded in the round FRP pipe are preferably spiral stirrups; binding the FRP rib cage according to the design requirement, and then placing the FRP rib cage in the FRP pipe 1 for standby. The sizes and the like of the FRP pipe alkali-activated slag-based seawater coral aggregate concrete column can be flexibly designed according to the requirements in practical engineering.
(2) Preparing alkaline excitant solution
The preparation process of the alkaline excitant used in the preparation of the alkali-activated slag-based seawater coral aggregate concrete comprises the following steps: firstly, quickly dissolving Na2SiO3Pouring the powder into seawater with half of total water consumption, stirring for about 2min, slowly adding flake NaOH into the mixed solution, slowly pouring flake NaOH while stirring to avoid NaOH precipitating and caking in the container, and stirring for about 3min to allow Na to precipitate2SiO3And completely dissolving the powder and NaOH particles, and finally sealing and cooling the mixed alkaline hair agent solution for 24 hours for later use.
(3) Preparation of alkali-activated slag-based seawater coral aggregate concrete
The alkali-activated slag-based seawater coral aggregate concrete used in the invention comprises the following raw materials in each cubic concrete: 550 kg of slag powder, 841 kg of coral reef sand, 577 kg of coral coarse aggregate and Na2SiO358.5kg of powder, 21.6 kg of flake NaOH and 300 kg of seawater, and the strength of the prepared alkali-activated slag-based seawater coral aggregate concrete in 28 days can reach C40 level.
The preparation process of the alkali-activated slag-based seawater coral aggregate concrete comprises the following steps: firstly, placing weighed coral reef sand and coral reef in a stirrer, dry-stirring for 1.5-3 min to make the aggregate uniform, then pouring seawater with half of the total water consumption, and stirring for about 3min to make the coral aggregate realize a pre-wetting condition; then pouring the slag micro powder into the mixture, and stirring for about 2min to fully disperse the mixture; and (3) finally, pouring the alkali activator solution prepared in the step (2), and continuously stirring for about 3min to obtain the alkali activated slag-based seawater coral aggregate concrete.
(4) Pouring FRP pipe alkali-activated slag-based seawater coral aggregate concrete column
And (4) filling the FRP pipe prepared in the step (1) with the alkali-activated slag-based seawater coral aggregate concrete prepared in the step (3), and obtaining the FRP pipe alkali-activated slag-based seawater coral aggregate concrete column after the completion of maintenance.
In conclusion, the invention has the following advantages:
(1) the alkali-activated seawater coral aggregate concrete filled in the FRP pipes reasonably utilizes specific marine resources, namely seawater and waste coral aggregates, in the remote island reef area, so that the problem of lack of traditional building resources in the remote island reef area can be solved, and the delay of the construction period caused by transportation or weather change to project schedule can be avoided.
(2) The preparation of the concrete is realized by adopting the alkali-activated cementing material with compact slurry structure and high durability to replace the traditional cement-based material, and the micro interface structure of the coral aggregate and the slurry can be effectively improved, thereby achieving the purpose of improving the strength, impermeability and durability of the coral aggregate concrete.
(3) The raw materials used by the alkali-activated cementing material are derived from industrial solid waste slag, so that the energy consumption and greenhouse gas emission in the cement production process can be effectively reduced, and the sustainable development of energy conservation, emission reduction and environmental protection is realized.
(4) The adoption of the corrosion-resistant FRP pipe to restrain the concrete not only avoids the corrosion and expansion problems of the traditional reinforcing steel bar, but also enables the coral aggregate concrete to be in a three-dimensional stress state, and can greatly improve the bearing capacity, the ductility and the anti-seismic performance of the coral aggregate concrete member.
(5) The FRP tube alkali-activated slag-based seawater coral aggregate concrete column with localized raw materials, low cost, high environmental protection, high strength and high durability is prepared by adopting the strong combination of the high-durability alkali-activated cementing material and the corrosion-resistant FRP tube.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The utility model provides a FRP pipe alkali arouses slay base sea water coral aggregate concrete column which characterized in that includes:
FRP pipes;
the FRP rib cage is embedded in the FRP pipe and comprises a plurality of FRP longitudinal ribs axially distributed along the FRP pipe, and the adjacent FRP longitudinal ribs are connected through FRP stirrups;
and the alkali-activated slag-based seawater coral aggregate concrete is filled in a space formed by the FRP pipe and the FRP rib cage.
2. The FRP tube alkali-activated slag-based seawater coral aggregate concrete column as claimed in claim 1, wherein the FRP tube is a wound tube with a rectangular or circular cross section; the FRP stirrups are square or spiral, and the distance between every two adjacent FRP stirrups is not less than 50 mm; the diameter of the FRP longitudinal bar is 8-16 mm.
3. The FRP tube alkali-activated slag-based seawater coral aggregate concrete column as claimed in claim 1, wherein the FRP stirrups and the FRP longitudinal bars are connected by corrosion-resistant ties to form an FRP reinforcement cage.
4. The FRP pipe alkali-activated slag-based seawater coral aggregate concrete column as claimed in claim 1, wherein the FRP pipe is one or more of BFRP, CFRP, GFRP or AFRP; the FRP stirrups are one or more of BFRP, CFRP, GFRP or AFRP; the FRP longitudinal ribs are one or more of BFRP, CFRP, GFRP or AFRP.
5. The FRP tube alkali-activated slag-based seawater coral aggregate concrete column as claimed in claim 1, wherein the alkali-activated slag-based seawater coral aggregate concrete is obtained by mixing slag, an alkali activator, coral aggregate and seawater; wherein the coral aggregate is a mixture of coral reef sand and coral reef stone; the alkali activator is prepared from Na2SiO3Powder and flake NaOH.
6. The FRP tube alkali-activated slag-based seawater coral aggregate concrete column as claimed in claim 5, wherein the slag is granulated blast furnace slag micropowder of S95; the alkali activator is composed of powdered Na2SiO3Mixing flake NaOH and seawater; wherein the modulus of the alkali activator is 1.2-1.6, and the alkali content is 4-8%.
7. The FRP tube alkali-activated slag-based seawater coral aggregate concrete column as claimed in claim 6, wherein the activated slag-based seawater coral aggregate concrete comprises the following components in proportion in each cubic concrete: slag 450-550 kg; 650 kg of coral reef sand and 850 kg of coral reef sand; 550 kg of coral reef and 700 kg of coral reef; na (Na)2SiO345-90 kg of powder; 15-30 kg of flake NaOH and 330 kg of seawater.
8. The FRP tube alkali-activated slag-based seawater coral aggregate concrete column as claimed in claim 7, wherein the coral aggregates are derived from waste coral aggregates produced by port dredging, natural weathering and canal digging, the seawater is derived from natural seawater, and the water-to-gel ratio is preferably 0.55-0.65.
9. A method for preparing the FRP pipe alkali-activated slag-based seawater coral aggregate concrete column as claimed in any one of claims 7 to 8, comprising the steps of:
(1) preparing an FRP pipe and an FRP rib cage:
binding adjacent FRP stirrups through the FRP longitudinal reinforcements until all the FRP stirrups are bound to form an FRP reinforcement cage, and then sleeving the FRP reinforcement cage in the FRP pipe for later use;
(2) preparing an alkaline activator:
mixing Na2SiO3Pouring the powder into seawater with half of the total water consumption, stirring, adding flake NaOH into the mixed solution, and continuously stirring until Na2SiO3Completely dissolving the powder and NaOH, sealing the prepared alkaline hair-growing agent solution and cooling for later use;
(3) preparing alkali-activated slag-based seawater coral aggregate concrete:
placing the weighed coral reef sand and coral reef in a stirrer, dry-stirring for 1-3 min to uniformly mix the coral reef sand and the coral reef, then pouring seawater with half of the total water consumption, and stirring for 2-4 min to pre-wet coral aggregate;
then pouring the slag into the mixture, and stirring for 1-3 min to fully disperse the mixture;
finally, pouring the alkali-activated agent solution prepared in the step (2) into the mixture, and continuously stirring for 2-4 min to obtain the alkali-activated slag-based seawater coral aggregate concrete;
(4) pouring FRP pipe alkali-activated slag-based seawater coral aggregate concrete column
And (3) filling the alkali-activated slag-based seawater coral aggregate concrete prepared in the step (3) into the FRP pipe in the step (1), and obtaining the FRP pipe alkali-activated slag-based seawater coral aggregate concrete column after the completion of maintenance.
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