133 results about "Coral sand" patented technology

The invention provides seawater coral aggregate concrete prepared by matching low-heat portland cement for ocean projects, a seawater coral aggregate concrete salt fixing agent, a pre-screened natural coral-sand mixture (with the particle size of 0-20 mm), a pre-screened broken coral-sand mixture (with the particle size of 0-31.5 mm), a coral aggregate seawater concrete water reducing agent, a concrete retarder, a concrete defoaming agent, natural seawater or primary desalined seawater. With application of the seawater coral aggregate concrete, the shortcomings that ordinary cement and low-strength coral concrete easily generate long-term strength back shrinkage, skin cracking and peeling of surface salt marsh, frequently happening shrinkage cracks and temperature cracks and poor new mixing workability and thus cannot be pumped for construction on service in a tropical offshore reef harsh environment can be overcome; the ratio of used local materials reaches up to 75% or more, so the shortcomings of high cost, time consuming, labor consuming, high energy consumption and low efficiency due to long-distance sea transportation of ordinary concrete large-amount raw materials in offshore reef construction projects can be overcome.

The invention provides a method for curing loose coral sand by utilizing microorganisms. The method comprises the following steps: acclimating bacillus pasteurii under the condition that the concentration of sodium chloride is 10-35g / L, and when the activity of lysate is more than 2mM.min<-1> under the condition the concentration of sodium chloride is 35g / L, centrifugally collecting thallus and adopting a vacuum freezing and drying method for cold storage; then adding preserved thallus into seawater to prepare into the lysate, adjusting pH to 7-8, then mixing the lysate and a solution each liter of which contains 1mol of calcium and 1mol of urea according to the volume ratio of 1:2, filling the mixture into coral sand once every day and 3-6 days in total. The method provided by the invention has the advantages that the particles are meshed by wrapped carbon calcium, so that the strength is up to 14MPa; and the thallus can be directly diluted by using seawater, and the solution with calcium chloride and urea can be directly prepared by using seawater, so that the problems of shortage of fresh water and material transportation on reef islands are solved.

The invention discloses a nursery stock planting method on coral sand of a newly-built tropical dredger-reclaimed reef. The method comprises the steps of 1, adopting a nursery stock of which the height does not exceed 3 m; 2, treating the nursery stock with ABT rooting powder; 3, digging a planting pit, and leaching the plating pit with desalination seawater; 4, covering the bottom of the planting pit with red nutrient soil; adopting the desalination seawater to leach the coral sand or sea sand dug from the planting pit, and refilling the coral sand and the sea sand; 6, paving the surface of the planting pit with a layer of red nutrient soil, and irrigating with the desalination seawater. According to the nursery stock planting method on the coral sand of the newly-built tropical dredger-reclaimed reef, by leaching the coral sand or the sea sand with the desalination seawater, the salt and alkali content is lowered, the cycle is short, and the cost is low; by covering the red nutrient soil, not only is the soil structure of the planting pit improved and the pH value of the coral sand or the sea sand lowered, but also the red nutrient soil can be served as a bottom salt and alkali isolation layer; by using the coral sand and the sea sand as planting soil, not only is the cost saved, but also the original ecology of the reef is guaranteed; according to the planting technology, the survival rate of the transplanted nursery stock on the newly-built dredger-reclaimed reef is raised to 95% or above.

The invention discloses a partition lateral pressure creep test device for a coral sand foundation and an application method of the partition lateral pressure creep test device. The partition lateralpressure creep test device for the coral sand foundation comprises a sand pump, a pressure device and a pushing device. The pressure device comprises a rubber capsule, a capsule top plate and a central steel pipe. The rubber capsule is of a hollow cylindrical structure with an upper opening and a lower opening. The capsule top plate is in sealing connection with the upper bottom surface and the lower bottom surface of the rubber capsule. The central steel pipe penetrates through the axis of the rubber capsule. The sand pump is connected with the rubber capsule through a sand delivery pipe. Thepushing device is connected with the side surface of the rubber capsule, and displacement occurs with the expansion of the rubber capsule. According to the partition lateral pressure creep test device for the coral sand foundation, a partition-type test form is adopted, and meanwhile, solid-liquid mixing is used as an expansion medium for the main pressurizing; and ethanol liquid is subjected toelectronic control heating to generate saturated vapor pressure to perform auxiliary accurate pressure control, and the pressurizing mode lowers the requirements for the airtightness of the device, and guarantees the stability and accuracy of the applied pressure under the long-term creep test.

The invention provides a coral sand solidification method. The method comprises the steps that firstly, a high-pressure whirl-spray grouting device is drilled to a preset depth range; secondly, a mortar pump valve is started, slurry is conveyed to a drill pipe by extrusion of a mortar pump, extrusion grouting is conducted on coral sand through a drill bit and a grouting hole, and in the preset depth range, the drill bit rotates while grouting is conducted; thirdly, whirl-spray agitating is completed, the drill pipe is lifted out, and coral sand concrete can be obtained after solidification. The coral sand concrete obtained by solidification of the coral sand is good in compaction degree and high in shock resistance and greatly enhances the crack resistance and permeability resistance of the coral sand base course, the coral sand concrete with a certain strength is formed, and therefore the loss of the coral sand is reduced.

The invention discloses a coral sand stratum barrel-shaped foundation reinforcing device based on MICP and a mounting method. The device comprises a barrel-shaped foundation, a water pumping hole, a grouting master pipe, a grouting steel pipe, a one-way valve, a backflow pipe and the like. A draining hole connected with the grouting steel pipe is formed in a barrel-shaped foundation top plate, thegrouting steel pipe is arranged to be like a Chinese character mi, and grouting holes are formed in the grouting steel pipe along the outer side wall of the foundation at equal intervals. The backflow pipe is arranged on the exterior of the foundation and used for recovering and circulating of slurry. According to the coral sand stratum barrel-shaped foundation reinforcing device based on the MICP and the mounting method, through a microbial rock forming effect, a coral sand stratum is reinforced, the cementation effect between gravel as well as between the gravel and a structure object can be effectively improved, and the bearing capacity and the stability of the foundation are improved; and the MICP technology has no bag influence on the environment and ecology and is an environment-friendly technology suitable for coral sand stratum reinforcement.

The invention relates to the field of the coral sand foundation treatment, and specifically relates to a method for reinforcing South china sea coral sand foundation by using high-polymer PFA. Diluentand retarder are added in a novel high-polymer material PFA to effectively solve the problem that the high-polymer PFA is fast in solidification and bad in groutability. The high-polymer PFA is injected into the coral sand foundation, and the foundation bearing capacity is greatly improved. A construction method is characterized by comprising the following steps: performing construction by usingan ultra-high pressure PFA pump and combining a positioning drilling machine with a hole at a drill, wherein the drilling machine firstly positions and drills, and then preparing the high-polymer PFAmixed solution after drilling to a predetermined depth; conveying the high-polymer PFA mixed solution to the drill through the ultra-high pressure pump, starting rotary-jetting the high-polymer PFA mixed solution, improving while performing the rotary-jetting, and ending the rotary-jetting when improving to a designed elevation. The method disclosed by the invention has the advantages that the reinforcing effect is good, the construction is simple, the cost is low, the working life of the high-polymer PFA is prolonged, and the method can be extensively used for reinforcing the South China seacoral sand foundation.

The invention discloses a double-layer pile casing device for limiting expansion of a head of a cast-in-place pile and a cast-in-place pile construction method. According to the device, double-layer pile casings are used as a main body structure, wherein each pile casing is composed of four arc-shaped steel plates with the same size; every two adjacent arc-shaped steel plates are connected througha spring; a spacing layer is formed between every two adjacent pile casings; different substances are selected to be filled according to actual engineering; the pile end of the cast-in-place pile ispoured in an inner circle and an outer circle; and the high-pressure grouting process and the secondary grouting process are used in cooperation, so that continuous expansion of the head of the cast-in-place pile is limited, the head is prevented from cracking due to continuous expansion, and the bearing capacity of the pile head is guaranteed. The double-layer pile casing device is easy to place,obvious in limiting effect and high in bearing capacity, and corresponding improvement measures can be added according to different foundation conditions for use; and the double-layer pile casing device not only limits expansion of the pile head, but also can be arranged at any position below the ground surface of the cast-in-place pile, and can be widely applied to coral sand foundations or foundations with particle crushing properties.

A coral sexual propagation system relates to the marine organism artificial breeding technology, and is provided with a coral incubator, an alga incubator, an alga screen and a pipeline system, wherein the coral incubator is provided with a main cylinder body, a bottom cabinet and a main cylinder LED lamp; the alga incubator is provided with a filtering cylinder body and a metal halogen lamp; the pipeline system is provided with a pipe network, a water pump, a temperature control device and a wave making device; the main cylinder body is arranged at the top of the bottom cabinet, the main cylinder LED lamp is arranged above the main cylinder body, a pipeline, a grid plate, a lower silk cover layer, a coarse sand layer, an upper silk cover layer and a coral sand layer are arranged at the inner bottom of the bottom cabinet from the bottom up, holes are formed in the pipeline, water in the main cylinder body and the filtering cylinder body enters the alga screen through the pipeline system to realize internal circulation of seawater, and the water pump, the temperature control device and the wave making device are connected through the pipe network and mounted in the main cylinder body; the water pumping end of the water pump is connected with the pipeline at the inner bottom of the bottom cabinet, and the water outflow end of the water pump is connected with the temperature control device and the wave making device. The coral sexual propagation system is simple in structure, smart in design and convenient to operate.

The invention provides a double-layer threaded steel pipe pile for a coral sand foundation and a construction method. The double-layer threaded steel pipe pile comprises a first outer-layer threaded steel pipe, a first inner-layer smooth steel pipe is mounted on the inner side wall of the first outer-layer threaded steel pipe through multiple uniformly distributed first rectangular steel pieces, the first rectangular steel pieces divide the annular cavity between the first outer-layer threaded steel pipe and the first inner-layer smooth steel pipe into multiple fan-shaped columnar first grouting areas, and multiple grout seeping holes are formed in the pipe wall of the first outer-layer threaded steel pipe in the first grouting areas in the height direction; a first pile head is arranged at the bottom end of the first outer-layer threaded steel pipe. The problem of waste of pile foundation engineering materials as a result of dismantling of temporary buildings can be solved. With the adoption of the designed pile, the purposes of enhancing the bearing force and saving materials can be achieved, and the purpose that piles can be recycled conveniently after the temporary buildings are dismantled can also be achieved.

The invention discloses a recycled environment-friendly water purification brick. The recycled environment-friendly water purification brick comprises the following raw materials by weight: 30-40% ofcarbonized sludge; 30-40% of cement; 3-8% of active coral sand; 3-5% of quartz sand; 3-10% of fiber; 5-10% of activated carbon; 3-8% of poly(benzene alkene amide); and 3-5% of medical stone. Specifically, the carbonized sludge is obtained by carbonization of sludge. According to the technical scheme, the recycled environment-friendly water purification brick can achieve efficient utilization of carbonized sludge, also can realize efficient purification of water source, can obviously reduce the turbidity of river water, and can effectively adsorb harmful substances, and can be used for the construction of river banks, fish ponds and water purification pools.

The invention discloses a construction method of a coral sand foundation expanding cement mortar injection pile. A mortar solid discrete material pile is arranged on the periphery of a pile body, a small-diameter mortar injection pipe is arranged in the center of the pile body, and expanding mortar enters a discrete material through the mortar injection pipe; the peripheral discrete material is glued and solidified into a whole through expanding cement mortar; meanwhile, the expanding cement mortar enters a coral sand foundation under the action of mortar injection pressure, and the character of the expanding cement mortar can be improved; and after the expanding cement mortar injection pile is formed, the pile body expands, a soil body around the pile can be subjected to compaction, the character of soil around the pile is improved, and the strength of the soil around the pile is improved. According to the construction method, a construction process is clear, the construction speed is high, the pile forming effect is good, bearing force is high, the manufacturing cost is low, the geological resource of calcareous sand is fully utilized, the environment is protected, and energy saving and environment protection are achieved. The construction method has positive effects on reclamation project work of the large-area coral sand foundation in the South China Sea, the problems about pile forming and the like on a calcareous sand foundation can be solved well, and therefore civil purposes, military purposes and multiple other purposes are met.

The invention discloses a device for testing the extrusion process of coral sand around an expansion pile through CT and an application method. The invention aims at solving the problems that the crushing process of coral sand particles is inconvenient to observe, and the stress crushing characteristics of the coral sand cannot be well summarized. The crushing process of the coral sand under the action of the expansive concrete with different expansive agent concentrations is observed; the coral sand pile-forming crushing stress mechanism and the mechanical response in the actual engineering are simulated; the mechanical response and deformation conditions of the coral sand under the action of loads of different grades and different directions can be quantitatively researched; and the crushing characteristics of the coral sand under the stress condition are obtained by researching the corresponding relation of the compression settling volume, shape, particle size and load value of thecoral sand in the experiment process. The observation problem of the crushing process of the coral sand under the stress condition is solved, the mechanical response and deformation conditions of thecoral sand under loads of different grades and different directions are obtained, and wide engineering practice significance and application prospects are achieved for researching and summarizing thestress crushing characteristics of the coral sand.

The invention discloses seawater and coral sand mixed red mud-coal gangue based geopolymer concrete. The concrete comprises red mud, coal gangue, coral sand, gravel, a sodium hydroxide solution, a water glass solution, artificial seawater and a water reducing agent. The preparation method comprises the following steps: preparing artificial seawater; screening out fine sand from the coral sand; knocking large coal gangue blocks into small coal gangue blocks, and crushing the small coal gangue blocks; air-drying or drying the red mud slurry until the water content is lower than 3%, measuring thepH value of the red mud slurry, and then crushing the red mud slurry; preparing a red mud-coal gangue mixed raw material; preparing a sodium hydroxide solution; lowering the mold of the water glass through a sodium hydroxide solution; mixing the sodium hydroxide solution with the water glass solution subjected to mold reduction to form an alkaline activator; designing the total proportion of thematerials; and preparing all the prepared raw materials into a finished product. The prepared concrete is high in compressive strength and slump, low in cost and wide in application range, recycling of two large solid wastes is achieved, and a new building material source is provided for island and reef construction.

The invention relates to an underwater repairing material based on seawater and coral sand and a preparation method thereof. The underwater repairing material is prepared from sulphoaluminate cement,maritime work Portland cement, fly ash, redispersible latex powder, modified epoxy resin, an organic resist, an expanding agent, an underwater anti-dispersing agent, modified coral sand and a high-efficiency polycarboxylate superplasticizer, wherein the modified coral sand is coral sand of which the surface is coated with a hydrophobic coating, and the modified epoxy resin is waterborne epoxy resin coupled with nano polysulfide rubber powder and nano graphite powder. In the invention, artificial broken coral sand is used for replacing natural river sand, and cement mortar is compounded with epoxy resin, so that the bonding performance of the underwater repairing material is improved, slurry loss is reduced by compounding an underwater anti-dispersing agent and an organic corrosion inhibitor, a passive film is formed on the surface of a reinforcing steel bar; in addition, a composite expanding agent is added, so that the multiple expansion sources continuously expand to improve the fitness between the underwater repairing material and an original component and block a harmful ion erosion channel.

The invention relates to the field of coral sand foundation treatment, in particular to a reinforcement construction method with coral sand foundation deep vibroflotation cooperating with shallow watering impact rolling. According to the characteristics that a hydraulic fill coral sand foundation which is subjected to land fill again after the site is transferred is loosened, low in compactness and high in compressibility, the foundation treatment method with a vibroflotation method being combined with a watering impact rolling method is provided, wherein the vibroflotation method is used forthe foundation of which the depth is 1.0 m or above, and the watering impact rolling method is used for the shallow foundation of which the depth is smaller than 1 m. The construction method combinesthe two foundation treatment methods, the compactness of the hydraulic fill coral sand foundation can be remarkably improved, the foundation bearing capacity is improved, the foundation post-construction settlement is reduced, and the construction method has the advantages that operation is easy, the targeted performance is high, and the effect is good.

The invention discloses a method for accelerating adult Tachypleus tridentatus sexual maturity and cultivation system using the method. The method accelerates the adult Tachypleus tridentatus sexual maturity by controlling the water level and water flow of a cultivation pond to simulate the tidal phenomenon of the natural environment. The cultivation system comprises the cultivation pond, a micro-filter, a low-level reservoir, a water pump, a biological filter tank, a protein separator, an ozone sterilizer, an ultraviolet sterilizer and a high-level reservoir which are sequentially connected through pipelines and is characterized in that the high-level reservoir is connected with the cultivation pond through a pipeline; a water quality monitoring device I is mounted on the low-level reservoir, and a water quality monitoring device II and a temperature control device are mounted on the high-level reservoir; coral sand is laid on the bottom of the cultivation pond. The method is few in control conditions, simple to operate and good in effect. The circulating-water cultivation system is capable of avoiding the poor water quality problem of existing cultivation manners, and the problemof appendage abrasion of adult Tachypleus tridentatus during movement in the cement pond is solved by laying the coral sand on the bottom of the cultivation pond.

The invention relates to a cultivation matrix for planting passion fruits through improving coral sand of a filled island reef and belongs to the technical field of fruit tree growing. The cultivationmatrix is prepared from the following ingredients in volume ratio: peat, sheep dung and the coral sand which are in the volume ratio of (2 to 3): (0 to 2): (1 to 2). By adding the peat and the sheepdung, the alkaline strength, porosity and salt content of the coral sand are lowered, the nutrient content of the coral sand is improved, the moisture-retaining powder is enhanced, bottommost soil conditions for planting the passion fruits are achieved, and the requirements of passion fruit seedlings on normal growth and development are met; and the content of organic carbon in the cultivation matrix is further increased, fast-acting K and P are further increased, the display of growth effect is better, and indexes such as survival rate, maximum branch length, total branch amount, flower amount and set fruit amount are higher than average values.

The invention discloses a device and a method applied to tropical island seaweed transplanting. The device comprises a basket frame and ground nails for fixing the basket frame, wherein the basket frame comprises an upper top frame, a lower bottom frame and connecting rods connecting the upper top frame and the lower bottom frame; an upper grid is arranged in the upper top frame; the aperture of the upper grid allows a seaweed plant to pass freely; the lower bottom frame is provided with a lower grid; the bottom part of the basket frame is movably connected with the ground nails; and the distance between the upper grid and the lower grid is matched with the height of the seaweed undersea part. According to the device and the method applied to tropical island seaweed transplanting, the efficiency of processes such as seaweed plant collection, temporary cultivation, transplanting unit production, transportation and transplanting implementation can be improved significantly, fixation andcombination of seaweed plants on coral debris or coral sand substrate of tropical island reefs can be realized, tropical island storm can be effectively resisted, and the survival rate of seaweed transplantation is improved.

The invention discloses an efficient calcium mineralizing bacterium and an application thereof, and belongs to the field of microorganisms. The bacterium disclosed by the invention is bacillus cereusEMCa1. The strain is in a short rod shape, and is in a short or long chain, the size of the bacterium is about (1.0-1.2) x (3.0-5.0) [mu]m, the strain is a gram staining positive bacterium, white circular bacterial colonies appear after the strain is cultured for 24 h on an LB agar plate culture medium at 30 DEG C, a diameter is about 5-7 mm, the edge is irregular, and the bacterial colony surfaceis like wax. The induced calcium carbonate deposition characteristic of the strain is as follows: after 20 days of culture, the strain can convert free calcium ions in a coral sand solution into a calcium carbonate precipitate, and in a calcium carbonate deposition experiment, the concentration of calcium ions is reduced from 36.9 mg / L to 7.19 mg / L, and the proportion of calcite in coral sand isincreased from 2% to 20%. According to the efficient calcium mineralizing bacterium and the application thereof, calcium ions can be mineralized to generate calcium carbonate, so that the efficient calcium mineralizing bacterium is applied to the restoration of stone cultural relics.

The invention discloses a visualization device for simulating a coral sand compression and compaction process in sea reclamation. The device comprises a transparent external visual box, wherein a plurality of mounting holes are formed in the four side walls and the bottom plate of the external visual box; a movable visual box is placed in the internal space of the external visual box; the movablevisual box is a box body composed of four transparent side wall plates, a transparent bottom plate and a transparent cover plate. A plurality of fixing adjusting devices penetrate through a pluralityof mounting holes to fixedly splice the four transparent side wall plates and the transparent bottom plate into an integral box body, a mounting block is arranged in the middle of the transparent bottom plate of the movable visual box, an expanding agent feeding pipe is matched with the mounting block, and a plurality of drainage holes are evenly distributed in each transparent side wall plate andthe transparent bottom plate. By means of the device and method, the problems that visualization is insufficient, and the simulation degree of the simulated sand compaction process is low can be solved, and reliable data are provided for the sea reclamation process in advance.

The invention discloses a combined drilling and grouting pipe for grouting reinforcement of a soft stratum of an island reef. The combined drilling and grouting pipe comprises a grouting inner pipe, a grouting outer pipe and an outer end sleeve which are sequentially nested from inside to outside, flower holes are formed in the pipe walls of the grouting inner pipe and the grouting outer pipe, a crown-shaped drill bit is arranged at the tail end of the outer end sleeve, a film bag is bound on the outer wall of the grouting outer pipe, an upper spiral blade is fixed to the outer wall of the tail section of the grouting inner pipe, a small-size rotary drill bit is fixed to the tail end of the grouting inner pipe, and during application, the crown-shaped drill bit and the small-size rotary drill bit are jointly matched for rotary drilling. Meanwhile, the invention further discloses a construction process. A film bag localized key grouting reinforcement technology is adopted, a soft broken zone is subjected to key reinforcement, and a secondary spherical cylindrical grouting diffusion and reinforcement method is adopted; and the grouting effect is good, the grouting inner pipe and the outer end sleeve can be recycled, construction is convenient and fast, economical and practical, repeated drilling is not needed, the soft island reef foundation such as coral sand is effectively reinforced, and disturbance to the soft island reef foundation is reduced.

The invention relates to the field of treatment of shallow blow-filled coral sand foundations and particularly relates to a water-spray impact rolling construction method for a shallow blow-filled coral sand foundation. According to the characteristics that a transferred and refilled blow-filled coral sand foundation on a site is relatively loose, relatively low in compactness and a little large in compressibility, the construction method has the requirements that the site is firstly leveled, afterwards water is sprayed on the site until the coral sand foundation is close to an optimal water content state (the water content is larger than or equal to 20%), subsequently impact rolling is performed by utilizing a 25kJ trilateral impact road roller, and water is continuously sprayed in the overall impact rolling process until the foundation is compacted. Impact rolling is performed twenty times, subsequently a 25t vibratory smooth road roller is used for rolling the foundation until the foundation has no obvious wheelmark. The construction method provided by the invention can improve the compaction degree of the blow-filled coral sand island foundation, increases the bearing capacityof the foundation, reduces post-construction settlement of the foundation and has the advantages of simple operation and good effect.

The invention discloses a bactericide special for a swimming pool, and relates to the boiler living water treatment. The bactericide special for the swimming pool comprises the following components by weight percent: 2% of nano-titanium dioxide, 10-12% of silver-adsorbing activated carbon, and 86-88% of a coral sand loading agent. The preparation method comprises the following steps: sequentially adding the nano-titanium dioxide, silver-adsorbing activated carbon and coral sand loading agent into a container, and uniformly mixing and stirring, so as to obtain the final product. The bactericide has the advantages that added single agents have no toxicity and harm to the human body, no bactericide residues are left in water, and the bactericide is efficient in sterilization, environment-friendly and non-toxic.

The invention relates to a method for purifying water for engineering in an island area by using modified coral sand. The method comprises the following steps: (1) pretreatment; (2) purification: coastal seawater pretreated in the step (1) is pumped into a filter tower filled with modified coral sand filler, the pretreated coastal seawater is adsorbed and purified by the filler in the filter tower, impurities are removed sufficiently, and purified water for engineering in the island area is obtained. According to the method, a uniform dispersion system is formed by uniformly mixing three raw materials, is used for coral sand modification and enters pores of the coral sand in an infiltration process, a three-dimensional pore structure adopting small pores (magnetic ordered mesoporous carbon or magnetic ordered mesoporous nickel ferrite) sleeved with large pores (the coral sand) is formed, compared with randomness of the pores of natural coral sand, the pore structure of the modified coral sand is ordered, large and small pores are well-proportioned, the modified coral sand has good adsorption and storage effects when used for seawater purification treatment, and impurity removal is further facilitated during follow-up backwash.

The invention discloses a technique for rapid propagation of woody plants on tropical islands by granule spray sowing. The technique is characterized by including steps: (1) before spray sowing, soaking seeds in water at 40-50 DEG C for 6-24h; (2) performing granule spray sowing on an artificial soil layer and a seed layer, wherein the seed layer is 2-3cm in thickness; (3) after spray sowing is finished, covering and fixing with a sunshade net; (4) after emergence of seedlings, removing the sunshade net, and arranging a dense-mesh isolation net on a sea wind side; (5) applying compound fertilizers 14 days after emergence of the seedlings; (6) applying urea fertilizers 21 days after emergence of the seedlings; (7) applying urea fertilizers 30 days after emergence of the seedlings; (8) removing the dense-mesh isolation net after lignification of seedlings of trees and shrubs. By adoption of the technique, a goal of rapid greening of coral sand with woody plants in 45d can be fulfilled. Compared with a conventional greening method, the technique has advantages that complete greening time is shortened by about 40d, and greening construction cost and maintenance management cost are greatly reduced.

The invention discloses a granule spray sowing method for breeding Noni on a tropical reef. The method comprises the steps of 1, rinsing mature seeds of the Noni to be clean, soaking the seeds with warm water, and drying the seeds in shade; treating the seeds with gibberellin; 3, adopting desalination seawater to leach sea sand or coral sand; preparing an artificial soil layer and a seed layer on a leaching layer through a granule spray sowing technology; 5, adopting a sunshade net to cover the seed layer; 6, when seedlings grow to 4-5 cm, removing the sunshade net. Comparing the granule spray sowing method for breeding Noni on the tropical reef with a common artificial planting greening method, the construction speed is high, the prepared artificial soil medium is good in quality, and the Noni has a better capacity in resisting wind and erosion of rain; the emergence rate of the Noni seeds is raised to 85% and above, and the emergence time is shortened by 15-20 days; through maintenance means of sun shading, water and a fertilizer after sowing, the growth of the seedlings is promoted, and the effect of quick scale breeding is achieved.

The invention provides an in-situ preparation method of a cementing material for offshore area infrastructure. Coral sand, sea sand and other marine area resources are used as main raw materials to prepare the cementing material for offshore area infrastructure in situ. A movable wet mill is adopted to carry out ultrafine treatment on raw materials, coral sand and sea sand are used as the raw materials to prepare a nano-micron ultrafine admixture, and a nano-grade coral mortar material is used as an early strength agent to promote concrete to form tightest accumulation and improve the compactness of the concrete. According to the invention, the transportation volume of the cementing material for concrete infrastructure construction in the offshore area is reduced, and the problems of hightransportation cost, long construction period and large carbon emission of the cementing material are solved. A new thought is provided for the preparation method and the application of the cementingmaterial for the infrastructure in the offshore area.

The invention relates to the field of asphalt pavement materials, and discloses a coral sand-doped AC-13 normal-temperature asphalt mixture and a preparation method thereof. The mixture contains two or more of the following raw materials which are stored in a mixed manner or independently stored in an effective control amount: reaction type normal-temperature liquid asphalt, coral sand, coarse aggregate, fine aggregate, mineral powder and a curing agent. According to the normal-temperature asphalt mixture prepared by the method, coral sand with different mixing amounts is used for replacing part of fine aggregate, so that the water stability of the asphalt mixture is improved, the use amount of common gravel is saved, the normal-temperature asphalt mixture is suitable for island road engineering construction, and the cost is saved.