Sea sand recycled concrete artificial fish reef

Abstract

The application discloses a seawater-seasand recycled concrete artificial fish reef, and belongs to the field of marine engineering. The preparation material of the seawater-seasand recycled concrete artificial fish reef comprises a solidifying agent, seawater, seasand, recycled coarse aggregate, a reinforcing material and an additive. The mass ratio of the solidifying agent, the seawater, the seasand, the recycled coarse aggregate and the additive ranges from 1 to 8:0.4 to 4.2:0 to 6.8:0 to 8.8:0 to 0.6. The reinforcing material is a corrosion-resistant reinforcing material, and the reinforcement ratio is 0.3-4.5%. The solidifying agent is composed of an expansion component and a cementing component. A material capable of rapidly hydrating and generating an expansive hydrate with chloride ions and sulfate ions in seawater and seasand is used as the expansion component of the solidifying agent, and a material with a slow hydration rate is used as the cementing component of the solidifying agent. The reinforcing material, the seawater, the seasand, the recycled aggregate, the solidifying agent and the additive are uniformly mixed through a certain process, and then cast in a fish reef mold, vibrated and compacted, and cured under restraint for 1-3 days, and then demolded for standard curing for 28 days to obtain the seawater-seasand recycled concrete artificial fish reef.

Description

Technical Field

[0001] This invention relates to an artificial reef made of recycled seawater sand and concrete, belonging to the field of marine engineering. Background Technology

[0002] With the rapid development of marine ranching, artificial reefs can be used to restore and optimize the marine ecological environment, protect and enhance fishery resources, and purposefully create structures in the ocean. Common artificial reefs include reefs made from converted old ships, reefs made from waste tires, steel reefs, and reinforced concrete reefs. Currently, reinforced concrete reefs are the most popular and widely used. However, the corrosive effects of chloride and sulfate ions in seawater on silicate cement products pose a threat and challenge to the durability of concrete reefs. Furthermore, the materials used in the preparation of concrete reefs are mainly traditional building materials such as ordinary silicate cement, sand, and stone. The raw material input for concrete reefs is large, and the cost is high. The production of ordinary silicate cement generates huge carbon emissions, and sand and gravel mining leads to ecological damage and dust pollution. With increased environmental protection efforts, many sand quarries and natural sand and gravel production enterprises have closed down, resulting in a shortage of natural sand and gravel resources and rising prices of raw materials.

[0003] Urban development and urbanization, along with the demolition and reconstruction of numerous aging buildings, have generated massive amounts of construction waste, occupying vast amounts of land resources and threatening environmental safety. Currently, construction waste is often crushed and used as recycled aggregate to prepare recycled concrete. However, the crushing process easily generates numerous cracks and pores in the recycled aggregate, leading to insufficient strength and durability of the recycled concrete.

[0004] Based on this, the present invention proposes an artificial reef made of recycled seawater sand concrete. Summary of the Invention

[0005] This invention proposes a seawater sand recycled concrete artificial reef, aiming to provide a low-carbon, environmentally friendly, and economical option for marine ranches. By utilizing chloride and sulfate ions in seawater sand under constrained conditions to generate expanding hydrates with a curing agent, the seawater sand recycled concrete forms a dense and high-strength structure, effectively solving the corrosion problem caused by chloride and sulfate ions in seawater sand and realizing the resource utilization of seawater. It also addresses the technical challenge of insufficient strength and durability of recycled concrete caused by numerous cracks and pores in recycled aggregates generated during the crushing process of construction waste used to produce recycled aggregates, achieving efficient resource reuse of construction waste. Furthermore, it utilizes industrial waste residue as a binding material to completely replace silicate cement, significantly reducing carbon emissions from the seawater sand recycled concrete artificial reef, saving on the consumption of traditional building materials, and lowering project costs.

[0006] This invention proposes a seawater sand recycled concrete artificial reef, specifically comprising: seawater, sea sand, recycled coarse aggregate, curing agent, reinforcement, and admixtures; the sea sand is a continuously graded fine aggregate such as marine sand and gravel, coral fragments, and shell fragments, with a particle size range of 0.075~4.75mm; the shell fragments are shell fragments of marine mollusks; the recycled coarse aggregate is a continuously graded coarse aggregate such as construction waste and waste coral, with a particle size range of 4.75~25mm; the construction waste includes, but is not limited to, waste concrete, waste sintered bricks, waste ceramic tiles, waste granite, and waste sand and gravel; the curing agent consists of an expansion component and a cementing component, using a material that rapidly hydrates and reacts with chloride and sulfate ions in the seawater sand to form an expanding hydrate as the expansion component of the curing agent, while simultaneously... The curing agent uses a material with a slow hydration rate as the binding component, with the mass ratio of expansion component to binding component in the curing agent being 15~65:35~85. The reinforcing material is corrosion-resistant and has a reinforcement ratio of 0.3-4.5%. The types of reinforcing materials include, but are not limited to, steel bars, FRP bars, bamboo bars, fibers, and combinations of different types of reinforcing materials. Fibers include, but are not limited to, steel fibers, lignin fibers, synthetic fibers, and inorganic fibers. Inorganic fibers include, but are not limited to, basalt fibers, glass fibers, and ceramic fibers. If the reinforcing material's durability is insufficient in seawater and sea sand environments, anti-corrosion treatment is required. Admixtures include, but are not limited to, water-reducing agents, pumping agents, air-entraining agents, waterproofing agents, rust inhibitors, and antifreeze agents. The mass ratio range of curing agent, seawater, sea sand, recycled coarse aggregate, and admixtures is 1~8:0.4~4.2:0~6.8:0~8.8:0~0.6; The mixture of reinforcing material, seawater, sea sand, recycled coarse aggregate, curing agent, and admixtures is mixed evenly through a certain process and then poured into the artificial reef mold, vibrated to compact, and pressed using a pressure plate at a loading rate of 1-3 cm / min. When the peak load reaches 10-30 MPa, the pressure plate displacement is kept fixed to constrain the mixture in the mold. After curing under constrained conditions for 1-3 days, the mold is removed and standard curing is carried out for 28 days to obtain the seawater and sea sand recycled concrete artificial reef; The reinforcement ratio and the certain process refer to: ① When the reinforcing material is steel bar, FRP bar, or bamboo bar, the corresponding reinforcement ratio refers to the longitudinal reinforcement ratio, and the corresponding certain process refers to using the reinforcing material to weave a reinforcing cage and place it in the artificial reef mold, then filling it with seawater, sea sand, and recycled coarse aggregate. ① When the reinforcing material is fiber, the corresponding reinforcement ratio refers to the ratio of fiber mass to the total mass of the prepared material. The corresponding molding process involves mixing fiber, seawater, sea sand, recycled coarse aggregate, curing agent, and additives in a specific ratio, then pouring the mixture into the artificial reef mold and compacting it with vibration. ③ When the reinforcing material is a combination of steel bars, FRP bars, bamboo bars, and fibers, the corresponding reinforcement ratio refers to the longitudinal reinforcement ratio plus the ratio of fiber mass to the total mass of the prepared material. The corresponding molding process involves weaving a reinforcing cage with the reinforcing material and placing it in the artificial reef mold, then mixing fiber, seawater, sea sand, recycled coarse aggregate, curing agent, and additives in a specific ratio, pouring the mixture into the artificial reef mold, and compacting it with vibration.

[0007] The 1-3 day curing under constrained conditions described in this invention refers to the specific curing time under constrained conditions determined based on the combination of the hydration rates of the expanding and cementing components corresponding to the specific material composition of the curing agent.

[0008] The anti-corrosion treatment method described in this invention includes, but is not limited to, forming an anti-corrosion layer by using epoxy resin, chlorinated polyolefin, polyurethane resin, fluorocarbon resin coating, acrylic resin, polyurea waterproof and anti-corrosion coating, anti-corrosion structural adhesive, etc.

[0009] The expansion component of this invention is a rapidly hydrating material, consisting of part 1 and part 2. Part 1 is a material that rapidly hydrates with chloride and sulfate ions in seawater and sea sand to generate expanded hydrates. The expanded hydrates generated by its hydration include, but are not limited to, hydrated calcium chloroaluminate and hydrated calcium sulfoaluminate. Part 2 is a material that rapidly hydrates itself to generate expanded hydrates. The expanded hydrates generated by its hydration include, but are not limited to, hydrated calcium sulfoaluminate. The mass ratio of part 1 and part 2 in the expansion component is 20-100:0-80, respectively.

[0010] Part 1 of this invention includes, but is not limited to, a mixture composed of aluminum-containing waste residue, alkaline waste residue, etc., and when a combination of aluminate cement and quicklime is used, the corresponding mass ratio of the two is in the range of 9~12:6-30; Part 2 includes, but is not limited to, a mixture composed of aluminum-containing waste residue, alkaline waste residue, gypsum waste residue or sulfate waste residue, etc., and when a combination of aluminate cement, quicklime and gypsum is used, the corresponding mass ratio of the three is in the range of 9~12:6-30:24~30.

[0011] The cementing component of this invention is a material with a slow hydration rate, and the cementitious hydrates produced by its hydration include, but are not limited to, hydrated calcium silicate. The cementing component is composed of cementing materials and activators, with the mass ratio of cementing materials and activators in the cementing component being 70~100:0~30, respectively. The cementing materials include, but are not limited to, one or more combinations of slag, copper slag, phosphorus slag, coal gangue, bottom ash, rice husk ash, kiln ash, etc. The activator is an alkaline activator, including, but not limited to, one or more combinations of quicklime, hydrated lime, active magnesium oxide, sodium hydroxide, hydrated sodium silicate, etc.

[0012] The expansion component described in this invention needs to be determined according to the content of chloride ions and sulfate ions in seawater and sea sand, as well as the chemical equation for the formation of expansion hydrates, and the specific proportion of each component material in the expansion component needs to be determined according to known calculation methods.

[0013] The cementing component described in this invention requires the selection of an activator based on the hydration rate of the cementing component design, and the specific ratio of cementing material and activator in the cementing component is determined through preliminary experiments.

[0014] The curing agent described in this invention consists entirely of industrial-grade materials, all of which have a specific surface area greater than 150 m². 2 / kg of powder.

[0015] The shape of the artificial reef made of recycled seawater and sand described in this invention can be set as needed, including but not limited to cubes, cylinders, cones, hemispheres, polygons, and combinations thereof.

[0016] The specific construction process of the artificial reef made from recycled seawater and sea sand described in this invention is as follows: First, based on the chloride and sulfate ion content in seawater and sea sand, and the design value of the 28-day unconfined compressive strength of the artificial reef made of recycled seawater and sea sand, the type of reinforcement and reinforcement ratio are determined, the mass ratio of seawater, sea sand, recycled coarse aggregate, curing agent, and admixture are determined, the material composition and proportion of the expansion component and cementing component in the curing agent are determined, and the specific loading rate, peak load value, and curing time under constraint conditions are determined. Secondly, select the corresponding process according to the type of reinforcement material, mix the reinforcement material, seawater, sea sand, recycled aggregate, curing agent and admixture evenly through the corresponding process, pour it into the artificial reef mold, and cure it under constrained conditions for 1-3 days. Then remove the mold and carry out standard curing for 28 days to obtain seawater and sea sand recycled concrete artificial reef. Finally, the performance of the artificial reef made from recycled seawater and sand was tested.

[0017] The advantages of this invention are: ① This invention utilizes chloride and sulfate ions in seawater and sea sand to generate expanding hydrates with a curing agent under constrained conditions, thereby forming a dense and high-strength structure in recycled seawater and sea sand concrete. This effectively solves the corrosion problem caused by chloride and sulfate ions in seawater and sea sand and realizes the high-efficiency resource utilization of seawater, giving the artificial reefs made from recycled seawater and sea sand concrete good durability in the marine environment. ② This invention solves the technical problem that construction waste used to produce recycled aggregates is prone to generating a large number of cracks and pores in the recycled aggregates during the crushing process, resulting in insufficient strength and durability of recycled concrete. It realizes the efficient resource reuse of construction waste and enables seawater sand recycled concrete to have a dense structure and high strength. ③ This invention enables the complete replacement of silicate cement with industrial waste residue as a binding material, significantly improving the utilization efficiency of curing agents, saving carbon emissions from seawater sand recycled concrete artificial reefs, reducing the consumption of traditional building materials, and lowering project costs. It provides a low-carbon, environmentally friendly, and economical seawater sand recycled concrete artificial reef for marine resource development and artificial reef construction. Detailed Implementation

[0018] The following detailed description of the seawater sand recycled concrete artificial reef of the present invention is provided with specific embodiments. However, the application forms and scope of the seawater sand recycled concrete artificial reef provided by the present invention are not limited to this.

[0019] Example 1 A marine reef project plans to utilize the seawater and sea sand recycled concrete artificial reef described in this invention. Tests revealed that the chloride and sulfate ion contents in the seawater were 1.96% and 0.095%, respectively, while the chloride and sulfate ion contents in the sea sand were 0.092% and 0.012%, respectively. The seawater and sea sand recycled concrete artificial reef described in this invention has a design value of 45 MPa for its 28-day unconfined compressive strength.

[0020] The reinforcement type was determined to be basalt fiber, with a reinforcement ratio of 0.98%. The recycled coarse aggregate was waste sand and gravel, and the admixture was a water-reducing agent. The mass ratio range of the curing agent, seawater, sea sand, recycled coarse aggregate, and admixture was determined to be 3.2:1.4:5.3:6.8:0.13. The composition of the curing agent, calculated by weight, was as follows: expansion component: 4.3 parts aluminum-containing waste residue, 3.5 parts alkaline waste residue, and 3.7 parts gypsum-based waste residue; cementing component: 9.0 parts slag and 1.0 part quicklime. The loading rate was determined to be 1.5 cm / min, and the peak load was 20 MPa. The fiber, seawater, sea sand, recycled coarse aggregate, curing agent, and admixture were mixed evenly according to the specified ratio, poured into the artificial reef mold, vibrated to compact, and cured under constrained conditions for 1.5 days. After demolding, standard curing was carried out for 28 days to obtain the seawater and sea sand recycled concrete artificial reef. Testing showed that all performance characteristics of the seawater and sea sand recycled concrete artificial reef met the requirements.

[0021] Example 2 A marine reef project plans to utilize the seawater-sand recycled concrete artificial reef described in this invention. Tests revealed that the chloride and sulfate ion contents in the seawater were 2.01% and 0.15%, respectively, while the chloride and sulfate ion contents in the sea sand were 0.098% and 0.013%, respectively. The seawater-sand recycled concrete artificial reef described in this invention has a design value of 35 MPa for its 28-day unconfined compressive strength.

[0022] The reinforcing material was determined to be a combination of bamboo and fiber, with a reinforcement ratio of 0.52%. Basalt fiber was selected as the fiber, waste coral was used as the recycled coarse aggregate, and a pumping agent was used as the admixture. The mass ratio of curing agent, seawater, sea sand, recycled coarse aggregate, and admixture was determined to be 5.2:2.6:5.8:8.3:0.22. The composition of the curing agent, calculated by weight, was as follows: expansion component: 5.5 parts aluminum-containing waste residue, 4.0 parts alkaline waste residue; cementing component: 4.0 parts slag, 3.0 parts rice husk ash, and 3.0 parts active magnesium oxide. The loading rate was determined to be 3 cm / min, and the peak load was 12 MPa. A reinforcing cage was woven using the reinforcing material and placed in a reef mold. The fiber, seawater, sea sand, recycled coarse aggregate, curing agent, and admixture were mixed evenly according to the specified ratio and poured into the reef mold. The mixture was vibrated to compact the mixture and cured under constrained conditions for 1.0 day. After curing under standard conditions for 28 days, the seawater and sea sand recycled concrete artificial reef was obtained. Tests have shown that the performance of the seawater and sea sand recycled concrete artificial reef meets all requirements.

[0023] Example 3 A marine reef project plans to utilize the seawater-sand recycled concrete artificial reef described in this invention. Tests revealed that the chloride and sulfate ion contents in the seawater were 1.99% and 0.16%, respectively, while the chloride and sulfate ion contents in the sea sand were 0.13% and 0.01%, respectively. The seawater-sand recycled concrete artificial reef described in this invention has a design value of 25 MPa for its 28-day unconfined compressive strength.

[0024] The reinforcing material was determined to be bamboo reinforcement with a reinforcement ratio of 2.25%. The reinforcement underwent anti-corrosion treatment. The recycled coarse aggregate was waste bricks, and the admixture was a waterproofing agent. The mass ratio of curing agent, seawater, sea sand, recycled coarse aggregate, and admixture was determined to be 2.7:1.5:3.8:6.5:0.07. The curing agent composition, calculated by weight, was as follows: expansion component: 7.2 parts aluminum-containing waste residue, 4.8 parts alkaline waste residue, 2.7 parts sulfate waste residue; binding component: 4.0 parts slag, 4.0 parts kiln ash, 2.0 parts hydrated sodium silicate. The loading rate was determined to be 1.2 cm / min, and the peak load was 10 MPa. Reinforcing cages were woven from reinforcing materials and placed in artificial reef molds. Seawater, sea sand, recycled coarse aggregate, curing agent, and admixtures were mixed evenly in proportion and then poured into the artificial reef molds, vibrated to compact, and cured under constrained conditions for 2.5 days. After demolding, standard curing was carried out for 28 days to obtain the seawater and sea sand recycled concrete artificial reef. Testing showed that all performance characteristics of the seawater and sea sand recycled concrete artificial reef met the requirements.

[0025] Example 4 A marine reef project plans to utilize the seawater-recycled sand concrete artificial reef described in this invention. Tests revealed that the chloride and sulfate ion contents in the seawater were 2.03% and 0.18%, respectively, while the chloride and sulfate ion contents in the sea sand surrounding the island were 0.12% and 0.013%, respectively. The seawater-recycled sand concrete artificial reef described in this invention has a design value of 52 MPa for its 28-day unconfined compressive strength.

[0026] The reinforcement type was determined to be a combination of GFRP and glass fiber, with a reinforcement ratio of 3.88%. Recycled coarse aggregate was waste concrete, and the admixture was a water-reducing agent. The mass ratio range of curing agent, seawater, sea sand, recycled coarse aggregate, and admixture was determined to be 4.3:2.0:5.8:7.7:0.43. The composition of the curing agent, calculated by weight, was as follows: expansion component: 3.3 parts aluminum-containing waste residue, 2.4 parts alkaline waste residue, 5.2 parts gypsum-based waste residue; cementing component: 8.8 parts slag, 1.2 parts quicklime. The loading rate was determined to be 1.8 cm / min, and the peak load was 28 MPa. Reinforcing cages were woven using the reinforcement materials and placed in the artificial reef mold. The fiber, seawater, sea sand, recycled coarse aggregate, curing agent, and admixture were mixed evenly according to the specified ratio and poured into the artificial reef mold. The mixture was vibrated to ensure compaction and cured under constrained conditions for 1.8 days. After demolding, standard curing was performed for 28 days to obtain the seawater and sea sand recycled concrete artificial reef. Tests have shown that the performance of the seawater and sea sand recycled concrete artificial reef meets all requirements.

Claims

1. A type of artificial reef made from recycled seawater and sand, characterized in that: The materials used in the preparation of artificial reefs made from recycled seawater and sea sand concrete include seawater, sea sand, recycled coarse aggregate, curing agent, reinforcement, and admixtures. Sea sand consists of continuously graded fine aggregates such as marine sand and gravel, coral fragments, and shell fragments, with a particle size range of 0.075~4.75mm. Shell fragments are fragments of marine mollusks. Recycled coarse aggregate consists of continuously graded coarse aggregates such as construction waste and discarded coral, with a particle size range of 4.75~25mm. Construction waste includes, but is not limited to, waste concrete, waste sintered bricks, waste ceramic tiles, waste granite, and waste sand and gravel. The curing agent consists of an expansion component and a cementing component. A material that rapidly hydrates and reacts with chloride and sulfate ions in the seawater and sea sand to form expanding hydrates is used as the expansion component of the curing agent. Simultaneously, a material with a slow hydration rate is used as the cementing agent. The mass ratio of the cementing component, expansion component, and cementing component in the curing agent is 15~65:35~85; the reinforcing material is a corrosion-resistant reinforcing material with a reinforcement ratio of 0.3-4.5%, and the types of reinforcing materials include, but are not limited to, steel bars, FRP bars, bamboo bars, fibers, and combinations of different types of reinforcing materials. Fibers include, but are not limited to, steel fibers, lignin fibers, synthetic fibers, and inorganic fibers. Inorganic fibers include, but are not limited to, basalt fibers, glass fibers, and ceramic fibers. If the durability of the reinforcing material is insufficient in seawater and sea sand environments, anti-corrosion treatment is required; admixtures include, but are not limited to, water-reducing agents, pumping agents, air-entraining agents, waterproofing agents, rust inhibitors, and antifreeze agents; the mass ratio range of the curing agent, seawater, sea sand, recycled coarse aggregate, and admixtures is 1~8:0.4~4.2:0~6.8:0~8.8:0~0.6; The mixture of reinforcing material, seawater, sea sand, recycled coarse aggregate, curing agent, and admixtures is mixed evenly through a certain process and then poured into the artificial reef mold, vibrated to compact, and pressed using a pressure plate at a loading rate of 1-3 cm / min. When the peak load reaches 10-30 MPa, the pressure plate displacement is kept fixed to constrain the mixture in the mold. After curing under constrained conditions for 1-3 days, the mold is removed and standard curing is carried out for 28 days to obtain the seawater and sea sand recycled concrete artificial reef; The reinforcement ratio and the certain process refer to: ① When the reinforcing material is steel bar, FRP bar, or bamboo bar, the corresponding reinforcement ratio refers to the longitudinal reinforcement ratio, and the corresponding certain process refers to using the reinforcing material to weave a reinforcing cage and place it in the artificial reef mold, then filling it with seawater, sea sand, and recycled coarse aggregate. ① When the reinforcing material is fiber, the corresponding reinforcement ratio refers to the ratio of fiber mass to the total mass of the prepared material. The corresponding molding process involves mixing fiber, seawater, sea sand, recycled coarse aggregate, curing agent, and additives in a specific ratio, then pouring the mixture into the artificial reef mold and compacting it with vibration. ③ When the reinforcing material is a combination of steel bars, FRP bars, bamboo bars, and fibers, the corresponding reinforcement ratio refers to the longitudinal reinforcement ratio plus the ratio of fiber mass to the total mass of the prepared material. The corresponding molding process involves weaving a reinforcing cage with the reinforcing material and placing it in the artificial reef mold, then mixing fiber, seawater, sea sand, recycled coarse aggregate, curing agent, and additives in a specific ratio, pouring the mixture into the artificial reef mold, and compacting it with vibration.

2. The artificial reef made of recycled seawater sand as described in claim 1, characterized in that: The 1-3 day curing under constrained conditions refers to the specific curing time determined under constrained conditions based on the combination of hydration rates of the expanding and binding components corresponding to the specific material composition of the curing agent. The anti-corrosion treatment method includes, but is not limited to, forming an anti-corrosion layer using epoxy resin, chlorinated polyolefin, polyurethane resin, fluorocarbon resin coatings, acrylic resin, polyurea waterproof and anti-corrosion coatings, and anti-corrosion structural adhesives. The expanding component is a rapidly hydrating material, composed of part 1 and part 2. Part 1 is a material that rapidly hydrates with chloride and sulfate ions in seawater and sea sand to generate expanding hydrates, including, but not limited to, hydrated calcium chloroaluminate and hydrated calcium sulfoaluminate. Part 2 is a material that rapidly hydrates itself to generate expanding hydrates, including, but not limited to, hydrated calcium sulfoaluminate. The mass ratio of part 1 and part 2 in the expanding component is 20-100:0-80, respectively. Part 1 includes, but is not limited to, aluminum-containing waste residue... The mixture consists of alkaline waste residue, etc., and when using a combination of aluminate cement and quicklime, the corresponding mass ratio of the two is in the range of 9~12:6-30; Part 2 includes, but is not limited to, a mixture consisting of aluminum-containing waste residue, alkaline waste residue, gypsum-based waste residue, or sulfate waste residue, etc., and when using a combination of aluminate cement, quicklime, and gypsum, the corresponding mass ratio of the three is in the range of 9~12:6-30:24~30; the cementing component is a material with a slow hydration rate, and the cementing hydrates produced by its hydration include, but are not limited to, hydrated calcium silicate; the cementing component consists of cementing material and activator, and the mass ratio of cementing material and activator in the cementing component is 70~100:0~30, respectively; the cementing material includes, but is not limited to, one or more combinations of slag, copper slag, phosphorus slag, coal gangue, bottom ash, rice husk ash, kiln ash, etc.; the activator is an alkaline activator, including, but not limited to, one or more combinations of quicklime, hydrated lime, active magnesium oxide, sodium hydroxide, hydrated sodium silicate, etc.

3. The artificial reef made of recycled seawater sand as described in claim 1, characterized in that: The expansion component requires the specific proportions of each component to be determined using known calculation methods based on the chloride and sulfate ion content in the seawater and sea sand, and the chemical equation for the formation of the expansion hydrate. The cementing component requires the selection of an activator based on the designed hydration rate, and the specific proportions of the cementing material and activator to be determined through preliminary experiments. The curing agent consists entirely of industrial-grade materials, all with a specific surface area greater than 150 m². 2 / kg of powder.

4. The artificial reef made of recycled seawater sand as described in claim 1, characterized in that: The shape of the artificial reef made of recycled seawater and sand can be set as needed, including but not limited to cubes, cylinders, cones, hemispheres, polygons, and combinations thereof.

5. The artificial reef made of recycled seawater sand according to claim 1, characterized in that: The specific construction process of the seawater and sea sand recycled concrete artificial reef is as follows: ① Based on the chloride and sulfate ion content in the seawater and sea sand, and the design value of the 28-day unconfined compressive strength of the seawater and sea sand recycled concrete artificial reef, determine the type and reinforcement ratio of the reinforcement, the mass ratio of seawater, sea sand, recycled coarse aggregate, curing agent, and admixture, the material composition and proportion of the expansion component and cementing component in the curing agent, the specific loading rate and peak load value, and the curing time under constraint conditions; ② Select the corresponding process according to the reinforcement type, mix the reinforcement, seawater, sea sand, recycled aggregate, curing agent, and admixture evenly through the corresponding process, pour them into the reef mold, and cure under constraint conditions for 1-3 days. Then, remove the mold and perform standard curing for 28 days to obtain the seawater and sea sand recycled concrete artificial reef; ③ Test the performance of the seawater and sea sand recycled concrete artificial reef.