37 results about "Reactive magnesia" patented technology

The invention provides magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete is prepared from the following raw materials in parts by weight: 10-20 parts of phosphate, 30-50 parts of active magnesium oxide, 0.5-3 parts of a retarder, 5-15 parts of a mineral admixture, 0.5-4 parts of a functional additive, 20-30 parts of fine aggregate, 2-5 parts of reinforced fibers and 10-28 parts of water. The invention also provides a preparation method of the magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete provided by the invention has a multi-layer anti-corrosion barrier, a compact microstructure, an intelligent ion barrier and good environmental adaptability, and can meet the use requirements in complex and severe environments.

The invention discloses a method for curing loess through titanium extraction tailing modified magnesium oxysulfate cement, and belongs to the field of civil engineering materials. The method comprises the following steps: weighing titanium extraction tailings, loess, magnesium oxysulfate cement and water according to a specific mass percentage, mixing and stirring the raw materials to form a solidified soil mixture, and carrying out compression molding, demolding and natural curing to obtain a solidified loess sample. Wherein the titanium extraction tailings are specifically treated industrial tailings, and the magnesium oxysulfate cement is formed by mixing active magnesium oxide and a magnesium sulfate solution according to a specific proportion. By optimizing the raw material ratio and the process, the mechanical property and durability such as water resistance and freeze-thaw resistance of the solidified soil are improved, meanwhile, resource utilization of the titanium extraction tailings is achieved, and the requirement for green and environment-friendly development is met.

The invention relates to self-compacting micro-expansive high-volume-weight concrete and a preparation method thereof, and the self-compacting micro-expansive high-volume-weight concrete comprises the following components in parts by weight: 240-400 parts of cement, 80-150 parts of fly ash, 30-100 parts of silica fume, 20-60 parts of a rheology modified material, 20-60 parts of an expanding agent, 50-150 parts of an internal curing agent, 600-900 parts of fine aggregate, 800-1200 parts of coarse aggregate, 140-260 parts of water and 5-12 parts of an additive, the rheology modified material comprises glass beads, cellulose ether and polycarboxylic acid ether, and the mass ratio of the glass beads to the cellulose ether to the polycarboxylic acid ether is 1: (0.1-0.3): (0.001-0.01); the expanding agent comprises calcium oxide and active magnesium oxide; the internal curing agent comprises natural zeolite and zeolite powder; the fine aggregate comprises river sand and iron tailings; the coarse aggregate comprises broken stones and iron tailings. The problem of restriction among the volume weight, the volume stability and the working performance of the concrete in related technologies can be solved, so that the self-compaction, micro-expansion and high volume weight functions of the concrete are realized.

The invention discloses an all-solid-waste-based cementing material for inducing chlorine salt in waste incineration fly ash by using active magnesium oxide and a preparation method of the all-solid-waste-based cementing material. According to the invention, active magnesium oxide is utilized to induce in-situ conversion of the chlorine salt in the waste incineration fly ash into the cementing material, so that the problems of unstable curing system and potential secondary environmental pollution caused by harmful impurity chlorine salt are effectively improved, and the reaction degree and strength development of the cementing system are promoted under the action of co-processing the copper-containing electroplating sludge; and meanwhile, it is guaranteed that the heavy metal leaching concentration of the system meets the GB / T 16889-2008 national safety landfill standard. The cementing material prepared by the invention is expected to be used as building materials for roadbeds, land leveling, pit backfilling and the like, effectively widens the value-added utilization mode of solid wastes, realizes efficient toxicity reduction of the waste incineration fly ash, has positive influence on the environment, society and economy, and has wide application prospects. And an innovative sustainable development mode is provided for resource utilization of solid wastes and green transformation of the building industry.

The invention relates to a preparation method for preparing magnesium oxysulfate cement by using thermally activated boric sludge, which comprises the following steps: step 1, drying boric sludge, then carrying out ball milling, and sieving with a 200-mesh sieve; 2, activating the activity of magnesium oxide in the boric sludge: thermally activating the boric sludge treated in the step 1 to decompose magnesium carbonate in the boric sludge into magnesium oxide to obtain thermally activated boric sludge containing active magnesium oxide; step 3, respectively grinding an additive and magnesium sulfate heptahydrate; step 4, adding magnesium oxide into the thermally activated boron mud in the step 2, pouring the mixture into a planetary stirrer for multiple times, and mixing and stirring the mixture at the speed of 60-70r / min for 30-60s to obtain uniformly mixed powder; and 5, preparing the boron mud magnesium oxysulfate cement building material. The method has the advantages that a series of problems of boron mud treatment, complex process, low boron mud use amount and the like are effectively solved, meanwhile, the production cost of the magnesium oxysulfate cement is reduced, the boron mud treatment cost is saved, and good economic benefits and ecological benefits can be obtained.

The invention provides a reinforcing material suitable for a carbon sequestration rock interface and a preparation method thereof, and the preparation method comprises the following steps: calcining magnesium oxide powder to obtain active magnesium oxide; uniformly mixing active magnesium oxide with monopotassium phosphate to obtain first mixed powder; the molar ratio of the active magnesium oxide to the monopotassium phosphate is (3-5): 1; adding borax accounting for 5-10% of the mass of the active magnesium oxide into the first mixed powder, and uniformly mixing to obtain second mixed powder; mixing the second mixed powder with mixing water according to a water-material mass ratio of 0.10-0.40, and stirring to obtain magnesium phosphate cement paste; within the initial setting time after the magnesium phosphate cement paste is prepared, the paste is injected into a mold through pressure grouting equipment, and curing carbonization is conducted after the paste and rock are formed. By the adoption of the technical scheme, the interface sealing life is greatly prolonged, and the anti-carbonization performance is remarkably improved.

The calcination system comprises a preheating system, an activation furnace, a regulation and control kiln, a hot blast stove and a cooling system, the preheating system, the activation furnace, the regulation and control kiln and the cooling system are sequentially connected, an activation furnace burner is arranged on the activation furnace, a high-temperature recovery air outlet of the cooling system is connected with the activation furnace, and a high-temperature recovery air outlet of the hot blast stove is connected with the hot blast stove. A low-temperature recovery air outlet of the cooling system is connected with the hot blast stove, a hot blast stove burner is arranged on the hot blast stove, an air outlet of the hot blast stove is connected with the regulation and control kiln, hot air generated by fuel combustion in the hot blast stove enters the regulation and control kiln, the temperature in the regulation and control kiln is controlled to be kept at a certain constant temperature, and the content of active magnesium oxide is stabilized at a certain constant value. According to the invention, through mutual cooperation of secondary activity regulation and control, cooling and heat recovery processes of the kiln, hot air in the system is efficiently utilized and the energy consumption of the system is reduced while the content of active magnesium oxide in the product is precisely regulated and controlled, so that the system is suitable for large-scale industrial production, the cost is reduced and the cost performance is high.

The application relates to the technical field of cement-based material admixtures, in particular to a magnesium oxide-based low-temperature expansion agent and a preparation method and application thereof. The magnesium oxide-based expansion agent prepared by using active magnesium oxide as a main component, using a small amount of calcium oxide, adding modified starch, aluminum sulfate and sodium carbonate as promoting components can be used for low-temperature construction of cement-based materials.

The present application relates to the technical field of highway construction, and particularly relates to a magnesium-based grouting reinforcement slurry mix proportion design method, wherein three kinds of slurry with different cement mixing ratios are configured in the slurry mix proportion design process, and 2-4% of active magnesium oxide curing agent is added to each of the three kinds of slurry to carry out a comparative test, and the final design quality mix proportion is determined through comparison of the results after 28d standard curing. The present application has the following advantages: the incorporation of active magnesium oxide promotes the hydration reaction of cement, improves the early strength of the composite foundation, and promotes the construction progress; the active magnesium oxide-cement composite slurry can significantly increase the cohesion and internal friction angle mechanical parameters of the composite foundation soil, improve the roadbed bearing capacity, reduce the overall settlement of the roadbed, and ensure the stability of the composite foundation; the magnesium hydroxide crystals generated by the hydration reaction of active magnesium oxide produce expansion to compensate for the shrinkage caused by the hardening of cement.

This invention discloses a retarder for magnesium silicate cementitious materials and its preparation and application methods, belonging to the field of green building materials technology. The retarder of this invention is composed of sodium hexametaphosphate, citric acid, and tartaric acid in a mass ratio of (1-3):(2-4):(0.5-2). The retarder of this invention forms a three-level gradient synergistic retarding effect by using sodium hexametaphosphate to inhibit the rapid dissolution of active magnesium oxide, citric acid to chelate and regulate the magnesium ion concentration in the liquid phase, and tartaric acid to inhibit the nucleation and growth of hydration products, covering the entire hydration process of magnesium silicate cementitious materials. This invention also discloses the preparation and application methods of this retarder. Compared with existing technologies, the retarder of this invention can significantly extend the setting time of magnesium silicate cementitious materials while maximizing the preservation of their mechanical properties and improving slurry fluidity. Furthermore, the raw materials are widely available, the preparation process is simple, and the cost is controllable, showing good prospects for industrial application.

The invention discloses a method for solidifying dredged sludge by using a biological carbonization active magnesium oxide technology, which comprises the following steps: uniformly mixing 4-7 parts of carbonized rice hull ash, 3-5 parts of active magnesium oxide and 5-8 parts of chitosan solution; and then adding 30-35 parts of modified filler, 3-5 parts of sodium lignin sulfonate, 10-15 parts of cement and 20-25 parts of water, and fully blending to obtain the curing agent. The curing agent is adopted for curing and dredging the sludge, carbonized rice hull ash and active magnesium oxide in the curing agent are matched with a chitosan solution, sodium lignosulphonate and cement, meanwhile, the modified filler is adopted for coordination and cooperation, and refilling liquid and an alpha-aluminum oxide agent in the modified filler are jointly matched for synergism, so that the curing effect of the sludge is improved. And the strength performance of the sludge in the system is optimized, and the product has excellent performance stability after being soaked in water and at high temperature.

The invention provides inorganic mixed thermal insulation mortar and a preparation method thereof. The inorganic mixed thermal insulation mortar comprises the following components: 21-25% of composite Portland cement; 15-35% of self-made machine-made sand; 6.5 to 10.5 percent of mineral stone powder; 5-40% of modified inorganic glass beads; 0.01 to 5.0 percent of active magnesium oxide; 0.5 to 4% of dispersible latex powder; the content of the cellulose ether is 0.011 to 0.015 percent; 0.01-4% of a self-made crystalline waterproof agent; and 0.05 to 0.15% of polypropylene fiber. The preparation method of the inorganic mixed thermal insulation mortar comprises the following steps: adding the weighed mixture and a proper amount of mixing water into a stirrer, and stirring until the mixture is uniform, so as to obtain test mortar; pouring the test mortar into a test mold with a preset size to form a plurality of test pieces; and testing based on the size of the test piece to obtain test parameters of the test mortar, and adjusting the proportion of the components of the mixture according to the test parameters to obtain the inorganic mixed thermal insulation mortar. The building heat-insulation energy-saving efficiency and the technological level are improved, the engineering quality is ensured, the cost is reduced, and the ecological environment is protected.

The present invention proposes a method for characterizing the activity of light-burned magnesium oxide, comprising the following steps: calculating the active magnesium oxide content in the light-burned magnesium oxide; calculating the mass of the light-burned magnesium oxide based on the active magnesium oxide content; detecting the reaction time of the light-burned magnesium oxide with a weak acid; and obtaining a characterization result of the activity of the light-burned magnesium oxide based on the active magnesium oxide content and the reaction time. The present invention comprehensively considers the effective content of active magnesium oxide in the light-burned magnesium oxide and its reaction rate, characterizing both the amount of magnesium oxide that can participate in the hydration reaction and the speed of the magnesium oxide hydration reaction, thereby more comprehensively reflecting the activity characteristics of the light-burned magnesium oxide. The method of the present invention has a fast detection time and high accuracy, and is suitable for production; based on the characterization method of the present invention, the content of magnesium oxide participating in the hydration reaction can be accurately controlled, thereby achieving quality control of the light-burned magnesium oxide used in the preparation of magnesia cement and quality control of magnesia cement.

The application discloses a kind of water purifying agent waste residue-magnesium-aluminum ternary synergistic flow state solidified soil for bridge head backfill and preparation method, the flow state solidified soil includes: soil material, water purifying agent waste residue, aluminate cement, active magnesium oxide, magnesium sulfate heptahydrate, water-resistant modifier, reinforcing modifier and additional water.The application constructs water purifying agent waste residue-aluminate cement-magnesium sulphoaluminate cement three synergistic excitation mechanism, utilizes the chemical synergistic effect of aluminate cement and water purifying agent waste residue in magnesium sulphoaluminate cement environment, in combination with water-resistant modifier and reinforcing modifier, in situ induced magnesium-aluminum-calcium-based composite crystalline network.The network is inserted and wrapped in the interface transition zone between waste residue micro-particles and matrix, effectively repairs the crystal defects of traditional magnesium cement, significantly enhances the water resistance and chemical stability of the material, improves its strength retention rate in long-term immersion environment, ensures that backfill body has excellent long-term durability when bearing road load.

The invention discloses a straw / hydrated magnesium silicate composite material as well as a preparation method and application thereof. The straw / hydrated magnesium silicate composite material comprises the following components in parts by weight: 2-20 parts of straw, 80-98 parts of a cementing material, water and a water reducing agent, the gel material comprises the following components in parts by weight: 40 parts of active magnesium oxide, 12-54 parts of silica fume and 6-48 parts of fly ash; the water reducing agent is a polycarboxylic acid water reducing agent; according to the invention, straw is used as a reinforcing material of a hydrated magnesium silicate gel material, and a low-carbon gel material hydrated magnesium silicate is used as a matrix material, so that good stability of straw fibers in a matrix can be ensured.

The utility model provides a system for obtaining high-purity light burning powder and high-grade magnesium salt by grading and purifying magnesite, and relates to the technical field of magnesium salt chemical industry. The device consists of a calcining unit 1, a crushing unit 1, a winnowing and grading unit, a dust remover, a compressor, a hydrator, a suspension separator, a filtering unit 1, a calcining unit 2, a crushing unit 1, a carbonation tower, a filtering separator, a pyrolyzer, a filtering unit 2, a dryer, a crushing unit 2, a calcining unit 3 and a crushing unit 3. The high-silicon low-grade magnesite is sequentially subjected to solid-liquid separation means of crushing, winnowing and grading, hydrocyclone separation after hydration and carbonation, so that the magnesite purification process realizes good and bad classification and optimization of raw materials under the simple, step-by-step and effective principles, and most of low-grade magnesium oxide light calcined powder is separated into high-purity magnesium oxide light calcined powder at low cost; waste residues are separated out, active magnesium oxide, light magnesium carbonate and high-purity magnesium oxide with high additional values are obtained, and the problem of comprehensive utilization of low-grade magnesite is solved.

The systems and methods include a method. The method can include mixing, for a first time period, salt water with reactive magnesium oxide cement (RMC) at a first ratio to create a first mixture. The method can include mixing, for a second time period, the first mixture with an aggregate at a second ratio to create a second mixture. The method can include hydrating, for a third time period, the second mixture by molding and covering the second mixture. The method can include curing, for a fourth time period, the second mixture in a chamber to create an RMC-based composite, the chamber having a temperature value, a humidity value, and a CO2 concentration value.

The invention provides a low-shrinkage high-adhesion concrete crack repairing agent and a preparation method thereof, and relates to the field of concrete crack repairing, the low-shrinkage high-adhesion concrete crack repairing agent comprises inorganic dry powder and a microbial liquid agent, the mass ratio of the inorganic dry powder to the microbial liquid agent is 100: (20-30); wherein the inorganic dry powder comprises 60-75 parts of active magnesium oxide, 9-16 parts of monopotassium phosphate or ammonium dihydrogen phosphate, 10-20 parts of fly ash or silica fume and 5-15 parts of a boron compound; the microbial liquid agent is prepared from 10-25 parts of bacterial strain liquid, 1.2-3 parts of a nutrient source, 1.7-5 parts of a calcium source and 0-25 parts of distilled water; according to the invention, the induced mineralization ability of microorganisms is combined with the rapid hardening and early strength characteristics of an inorganic cementing material, so that the concrete crack repairing agent which has the characteristics of rapid plugging, high early strength, good cohesiveness, excellent environmental protection property and the like is developed.

The invention discloses a cementing material for a green low-carbon component and a preparation method, and relates to the technical field of green low-carbon building materials. The material comprises the following components in percentage by mass: 30-60% of a silicon-aluminum solid waste based gelling precursor, 3-12% of an alkaline activator, 5-20% of active magnesium oxide, 1-5% of a cationic biopolymer, 1-5% of an anionic biopolymer, a blending filler and water. The inorganic phase is composed of aluminosilicate gel formed by alkali excitation and a MgO carbonized product, and the organic phase is a complementary charged biopolymer composite network. The preparation method comprises the following steps: dry-mixing the powder, sequentially adding the alkaline excitation liquid and the cationic and anionic biopolymer solution, stirring to form slurry, and combining wet curing and CO2 curing after forming. The composite material has high strength, toughness, high temperature resistance, corrosion resistance and carbon sequestration performance, and is suitable for the fields of buildings, traffic and maritime work.

Disclosed in the present invention are a biochar-based alkali-activated containment material, a preparation method therefor, and the use thereof. The biochar-based alkali-activated containment material comprises 50-70% by mass of in-situ soil and 30-50% by mass of a cementitious material, wherein the cementitious material comprises an ash material and a composite alkali activator, and the composite alkali activator is obtained by ball milling activated magnesium oxide and biochar together. The biochar-based alkali-activated containment material of the present invention has better early compressive strength under a low cement-to-sand ratio and the 7d compressive strength thereof can reach 9.33 MPa; in addition, because of the presence of biochar, the containment material can better adsorb and trap soil contaminants and has better anti-seepage performance, and the permeability coefficient can reach 2.4×10-10 m / s. When being applied to rapid emergent containment for contaminated sites, the containment material can be quickly spread and quickly shape and achieve a lower seepage concentration of contaminants, thereby having a great application prospect.

The invention belongs to the technical field of building materials, and particularly relates to an active magnesium oxide-based carbon sequestration cementing material as well as a preparation method and application thereof. The active magnesium oxide-based carbon sequestration cementing material disclosed by the invention is prepared from the following mineral components: 5wt%-22wt% of periclase, 65wt%-80wt% of calcite and 0-5wt% of lime. The active magnesium oxide-based carbon sequestration cementing material contains active magnesium oxide, is good in carbonization activity, and can be used for preparing carbonized products with relatively high strength.

The invention relates to the technical field of refractory materials, in particular to a highly refractory RH gunning mix and a preparation method thereof. The high-fire-resistance RH gunning mix is prepared from the following raw materials in percentage by mass: 40-55% of graded 97 fused magnesite; 25 to 40 percent of graded high-purity sintered magnesia-calcium sand; 5-12% of active magnesium oxide; 2-5% of magnesium stearate; 3-8% of a binding agent; 0.5-2% of reinforcing fiber; 0.01 to 0.1 percent of explosion-proof fiber; wherein the binding agent is obtained by mixing the following raw materials in percentage by mass: 75-85% of modified starch and 5-15% of sodium hexametaphosphate; 5 to 15 percent of sodium carboxymethyl cellulose; the reinforced fibers are obtained by mixing modified carbon fibers and SiC whiskers according to the mass ratio of 9: (0.5-1). The RH gunning mix has excellent dispersibility, associativity, adhesiveness, erosion resistance and the like, the fire resistance of the RH gunning mix is enhanced through the comprehensive action, and the RH gunning mix shows longer service life.

The invention discloses a method for preparing magnesium oxysulfate cement by using high-activity magnesium oxide, and relates to a method for preparing the magnesium oxysulfate cement, which is characterized in that the hydration process of the high-activity magnesium oxide is regulated and controlled by adding a modifier, and the magnesium oxysulfate cement with good performance is prepared by controlling the feeding proportion of raw materials and process conditions. The invention aims to research and develop a preparation process of a green building material, and mainly aims to solve the problems of too short setting time, low mechanical strength, poorer water resistance and the like of magnesium oxysulfate cement prepared from high-activity magnesium oxide produced by new technologies such as flash light burning and the like due to too high content of the active magnesium oxide. The development of the high-activity magnesium oxide for preparing the environment-friendly magnesium oxysulfate cement is beneficial to expanding the wide application of the high-activity magnesium oxide, further promotes the popularization of a new technology for obtaining magnesium oxide such as flash light burning and the like, and provides a necessary technical support for energy conservation and carbon reduction of an industrial chain.

The invention relates to the technical field of road construction, in particular to a magnesium grouting reinforcement slurry mix proportion design method, in the slurry mix proportion design process, three kinds of slurry with different cement doping ratios are prepared, and 2-4% of active magnesium oxide curing agent is added into the three kinds of slurry respectively to carry out a contrast test. And the final design quality mix proportion is determined through comparison of results after 28-day standard maintenance. The invention has the following advantages: the addition of active magnesium oxide promotes the hydration reaction of cement, improves the early strength of the composite foundation, and promotes the construction progress; the active magnesium oxide-cement composite slurry can obviously increase the cohesive force and internal friction angle mechanical parameters of composite foundation soil, improve the bearing capacity of a roadbed, reduce the overall settlement of the roadbed and guarantee the stability of the composite foundation; expansibility generated by magnesium hydroxide crystals generated by hydration reaction of active magnesium oxide makes up shrinkage generated by cement hardening.

The invention relates to the technical field of building materials, and discloses an environment-friendly sand brick and a preparation method thereof.The environment-friendly sand brick is prepared from aggregate and raw materials of a gelling and functional system; the gelling and functional system comprises a sodium silicate solution, active magnesium oxide, glycerol triacetate and calcium formate; the preparation method comprises the following steps: carrying out dry mixing on the aggregate, the active magnesium oxide and the calcium formate, premixing a sodium silicate solution and glycerol triacetate, and then carrying out wet mixing, compression molding and maintenance. Sodium silicate gel is controlled by glycerol triacetate to provide early strength, and calcium formate is utilized to construct a substance transmission channel to drive active magnesium oxide to generate mineralization reaction in the later stage; an expansive product generated by the reaction can fill pores and microcracks, so that the long-term strength and water resistance of the material are remarkably improved, and damage self-repairing is realized; the sand brick prepared by the invention has excellent comprehensive mechanical property, durability and self-repairing function.

The invention discloses a cattle and sheep lick brick with magnesium phosphate cement as a binding material and a preparation method of the cattle and sheep lick brick, and belongs to the technical field of animal feed. The lick brick is prepared from 30-40 parts of magnesium phosphate cement, 20-25 parts of molasses, 3-8 parts of table salt, 10-15 parts of urea, 1-2 parts of an antioxidant, 10-15 parts of plant fiber powder, 1-2 parts of an immunopotentiator, 1-2 parts of an anti-mildew agent and trace element components of iron, copper, zinc, cobalt, selenium and iodine, the magnesium phosphate cement is adopted as a core binding material, and the lick brick is prepared by ball-milling active magnesium oxide and composite phosphate; and a gradient sterilization process and a special anti-mildew agent are matched. During preparation, 24-hour normal-temperature curing molding is realized through a three-stage process of premix preparation, magnesium phosphate cement activation and sterilization final mixing molding. The obtained product has the compressive strength of 2-8 MPa, has the characteristics of rapid forming, high strength, mildew resistance and nutrient slow release, and effectively solves the technical problems of slow curing, easy mildew and nutrient loss of the traditional lick brick.

This application provides a method for preparing magnesium-based cementitious materials from phosphate rock flotation tailings and the magnesium-based cementitious materials themselves, relating to the field of mineral processing. The method includes: drying and first homogenizing phosphate rock flotation tailings, followed by calcination to obtain a first material; homogenizing the first material with activated magnesium oxide to obtain a second material; and mixing the second material with a conditioning agent to obtain a magnesium-based cementitious material; wherein the conditioning agent includes at least one of magnesium chloride and magnesium sulfate. The resulting novel magnesium-based cementitious material possesses excellent physicochemical properties such as short setting time and high compressive strength. Furthermore, the phosphorus-containing minerals remaining in the phosphate tailings can improve the water resistance of the magnesium-based material within the novel cementing system.

The invention relates to self-curing low-carbon concrete for flues and chimneys and a construction method of the self-curing low-carbon concrete for flues and chimneys, and the concrete comprises the following components in parts by mass: 270-290 parts of low-calcium clinker; 10 to 15 parts of lithium slag; 70 to 90 parts of mineral powder; 30 to 40 parts of monopotassium phosphate; 10 to 15 parts of active magnesium oxide; 10 to 15 parts of barium carbonate; 7-8 parts of a polycarboxylic acid water reducer; 0.5 to 1 part of boric acid and 0.5 to 1 part of a silane-based water repellent; 1.5 to 2.5 parts of polypropylene fiber; 120 to 130 parts of water; 800 to 900 parts of coarse aggregate; and 650 to 750 parts of fine aggregate. According to the invention, hydration of the low-calcium clinker can be effectively activated, and the early strength of concrete is improved; flue gas pollutants are cured in multiple modes such as active magnesium oxide and barium carbonate two-stage sulfur locking, and the concrete has the advantages of being fast in early strength development, excellent in sulfate corrosion resistance, low in carbon, environmentally friendly, high in pollutant curing capacity and the like.

The invention relates to the technical field of building materials, and discloses an FRP green concrete composite structure based on carbonization curing and a preparation technology thereof.The preparation technology comprises the following steps that S1, active magnesium oxide cement paste is prepared, specifically, magnesium oxide and fly ash are mixed according to the mass ratio of 7: 3, water and an additive are added, and the active magnesium oxide cement paste is obtained; s2, a mold and a sleeve are prepared, specifically, the hollow sleeve is defined by a glass fiber reinforced composite material; preparing a hollow mold; the mold is arranged in the sleeve, and a gap is formed between the mold and the sleeve; s3, preparing a concrete mixture: mixing and stirring the active magnesium oxide cement paste, aggregate, an additive and water; s4, concrete pouring is conducted, specifically, a concrete mixture is poured into the gaps; s5, curing and demolding: after the concrete mixture is solidified and hardened, taking out the mold to obtain a hollow concrete sample; and S6, carbonization curing. The concrete provided by the invention not only has excellent mechanical properties and durability, but also is environment-friendly.