71 results about "Aluminite" patented technology

The invention belongs to the technical field of industrial solid waste resource recycling, and discloses a nano composite filling material based on in-situ acid-base mutual modification enhancement and application thereof. According to the nano composite filling material, the alkalinity of the red mud and the acidity of the desulfurized gypsum are used for neutralization, the alkalinity of a system is reduced, a synergistic reaction is excited, a large number of ettringite crystals playing a key enhancing role are generated under the regulation and control of a nano material, and the ettringite crystals and a geopolymer form an interpenetrating network structure. The obtained slurry is low-viscosity and high-fluidity Newtonian fluid (diffusivity gt and 250 mm), the 7-day strength is larger than 2.0 MPa, the pH value is 7-9, and the fluorine ion concentration is lt; and the leaching of heavy metal ions is qualified, and the method is environment-friendly and safe. Efficient resource utilization of the red mud and the desulfurized gypsum is achieved, and the method is simple in process, low in cost and especially suitable for mine filling and engineering backfilling.

The invention relates to the technical field of shield tunnel construction, and discloses a shield tunnel segment joint waterproof material and a waterproof structure, the shield tunnel segment joint waterproof material comprises a component A and a component B; the component A comprises the following component: 30-40 parts of liquid polysulfide rubber; 5 to 10 parts of a fluorinated polyurethane prepolymer; 1-5 parts of a silane coupling agent; 3-5 parts of fumed silica; 8-15 parts of hollow glass beads; 10 to 15 parts of nano calcium carbonate; 0.5 to 2 parts of polytetrafluoroethylene micro powder; 0.1 to 1 part of ettringite; the component B comprises the following component: 1-5 parts of manganese dioxide; and 5 to 10 parts of dioctyl phthalate. By utilizing the characteristics that the sealing gasket has excellent fluidity during injection and can be automatically cured into a high elastomer within a set time, a pre-installed sealing gasket can be replaced by adopting an innovative injection process, and the construction difficulty faced by high-precision shield segment assembly in a high-water-pressure environment is effectively solved.

The invention discloses marine concrete resistant to chlorine salt erosion and a preparation method thereof, and belongs to the technical field of building materials. The marine concrete is prepared from the following components in parts by mass: 280 to 350 parts of cementing material, 1100 to 1200 parts of aggregate, 150 to 180 parts of mixing water and 2.5 to 4.0 parts of high-efficiency water reducing agent, and the cementing material is prepared from 210 to 270 parts of ordinary Portland cement, 50 to 70 parts of superfine slag powder and 10 to 20 parts of modifier on the basis of the cementing material; on the basis of the modifier, the modifier is prepared from 30 to 45 parts of hexacalcium aluminoferrite, 25 to 35 parts of metaettringite, 20 to 35 parts of tobermorite, 3 to 6 parts of nano attapulgite and 2 to 4 parts of a nano composite material. The components can accelerate the early hydration of cement and the volcanic ash reaction process in the concrete hardening process, so that the concrete can form a compact microstructure in the curing period and cooperate with the curing effect of a hydration product on chloride ions, thereby remarkably improving the chloride ion penetration resistance of the concrete, prolonging the service life of the structure and improving the concrete quality. The method is suitable for port engineering, maritime work structures and buildings in salinized soil areas.

The invention relates to the technical field of mixed gels, in particular to a preparation method and application of a composite solid waste-based cementing material, and the preparation method comprises the following steps: grinding dried granulated blast-furnace slag, steel slag, fly ash, iron tailings, phosphogypsum and Portland cement, mixing to obtain a pretreated powder raw material, adding a modified activator into the pretreated powder raw material, and uniformly mixing to obtain the composite solid waste-based cementing material. And stirring to obtain the composite solid waste-based cementing material. The synergistic effect of the alkaline activator and the sulfate activator is matched with the nucleation induction effect of the mineral modified admixture, so that hydration process synchronization of multiple solid waste components is realized, sulfate, Ca < 2 + > and an aluminum phase quickly generate ettringite, the mineral admixture is used as a crystal nucleus for growth of a hydration product, the hydration induction period is greatly shortened, and the hydration efficiency is improved. The early strength development rate of the material is increased, the later strength is continuously increased without shrinkage, and the engineering pain point of insufficient early strength or later strength stagnation of a traditional solid waste-based material is solved.

The present application relates to the technical field of foam concrete preparation, in particular to foam concrete based on ettringite micro-expansion effect and a preparation method thereof, the preparation method comprising the following steps: S1. preparation of modified ettringite; S2. dry material premixing; S3. preparation of additives; S4. concrete forming. The modified ettringite and modified calcium sulfate synergize to significantly improve the interfacial bonding strength of aggregate-matrix, so that the early and medium-term compressive strength of the composite system is improved; at the same time, the improved pore structure forms a triple action mechanism of "ettringite reinforcement-pore optimization-stress buffering": ettringite improves the interfacial bonding and shrinkage compensation capacity, the dissolution space of aggregate absorbs the volume deformation stress, the pore structure optimization reduces the humidity diffusion gradient, and the strength-shrinkage synergistic control is realized.

The application discloses a quaternary solid waste-based soil stabilizer (GSCP) for a base layer, which is composed of slag (GGBFS), steel slag (SSA), calcium carbide slag (CS) and phosphogypsum (PG) and has a weight ratio of GGBFS:SSA:CS:PG=56:24:12:8. The stabilizer forms C-S-H colloid and ettringite (AFt) through alkaline activation and sulfate activation, does not need to add cement or chemical activator, is used for stabilizing silty clay and steel slag mixed soil, and significantly improves the unconfined compressive strength, splitting tensile strength, water stability and freeze-thaw resistance. Compared with a traditional cement-based stabilizer, the application reduces carbon emission by 82% and cost by 31.25%, provides a low-carbon and economical solution for road engineering, and is suitable for the base layer and the subbase layer of a secondary road or above.

The invention discloses all-solid-waste low-carbon vegetation concrete and a preparation method thereof, and belongs to the technical field of building materials. The all-solid-waste low-carbon vegetation concrete is prepared from a solid waste cementing material, solid waste coarse aggregate, fibers, a water reducing agent and water, the solid waste cementing material is prepared from the following raw materials in parts by mass: 55 to 90 parts of slag powder, 5 to 20 parts of industrial byproduct gypsum, 5 to 12 parts of rice hull ash, 5 to 15 parts of magnesium slag powder and 1 to 3 parts of carbide slag. The all-solid-waste low-carbon vegetation concrete designed by the invention has the advantages of low alkalinity, good durability, high utilization rate of solid waste resources and the like, and is low in total energy consumption and carbon emission due to no addition of cement. In an acid environment, the stability of a hydration product ettringite generated by the gelling system is higher than that of calcium hydroxide, and an obtained solid waste-based gelling material hardened body is more compact, can prevent hydrogen ions in the environment from entering the solid waste-based gelling material hardened body and has excellent acid corrosion resistance.

The application relates to the technical field of building materials, in particular to a cementing material for preparing an assembled wall body from multiple solid wastes and a preparation method; the cementing material is prepared from 25-55 parts of fly ash, 25-65 parts of blast furnace slag, 8-10 parts of lime, 1-5 parts of desulfurization gypsum, 3-6 parts of a first mixture, 2-5 parts of a second mixture and 5-8 parts of an alkali activator; the mass ratio of metakaolin, bentonite and superfine calcium carbonate in the first mixture is 3:2:1; the mass ratio of vermiculite, expanded perlite and glass beads in the second mixture is 2:2:1. The cementing material has a more stable microstructure through the synergistic activation of Ca and Na, and the addition of the first mixture and the second mixture. 2+ and Na + The C-S-H and C(N)-A-S-H gels form a three-dimensional network, needle-shaped ettringite crystals fill pores, and the anchoring effect of brucite phase is combined, so that the mechanical properties, such as strength and durability, of the material are significantly improved.

The invention provides ardealite-based fine aggregate as well as a preparation method and application thereof, and relates to the technical field of building materials. The phosphogypsum, the calcium-based alkaline material and the slag are compounded for use, and the calcium-based alkaline material generates alkaline excitation on the slag to promote rapid dissolution of the slag and participate in a hydration reaction; sulfate in the ardealite excites the slag to generate gelling property, a large number of amorphous phases exist in the slag, the aggregate is gradually hydrated under composite excitation of alkalinity and salt, C-(A)-S-H gel and ettringite are formed, main strength is provided for the ardealite-based fine aggregate, the ardealite-based fine aggregate continues to be slowly hydrated in the curing process, and the curing effect is good. The strength is further improved, and the cylinder compressive strength of the ardealite-based fine aggregate prepared by the embodiment is up to 12.8 MPa. In addition, by adopting a mode of pressing into balls (the pressure is 15-20MPa) through two pressurizing rollers, the compactness of the ardealite-based fine aggregate is improved.

The invention provides aluminum electrode corrosion foil by-product-based wet-mixed plastering mortar and a preparation method thereof, and belongs to the technical field of solid waste resource utilization. Calcium hydroxide generated by hydration of cement, calcium sulfate and aluminum hydroxide in the aluminum-containing electrode corrosion foil byproducts and silicon dioxide and aluminum oxide in the fly ash are utilized to generate calcium silicate, calcium aluminate and ettringite gel with cohesiveness and water resistance, the expansion performance of the ettringite gel is utilized, and the corrosion resistance of the aluminum-containing electrode corrosion foil is improved. The cohesiveness and the strength of the mortar are further enhanced, and the crack resistance and the water resistance of the mortar are improved; the dispersing agent is added to improve the dispersity of the raw materials; by adding the air entraining agent, the viscosity of the mortar is reduced, and the crack resistance and toughness are improved; by limiting the mass content of each raw material, the performance of the wet-mixed plastering mortar can meet the standard requirements; and the uniformity and construction performance of the mortar are ensured by limiting the particle size of the aluminum electrode corrosion foil byproduct and the consistency of the wet-mixed plastering mortar.

The application discloses a kind of heavy metal wastewater continuous treatment methods rich in sulfate, belong to environmental management technical field.The method relies on adjusting tank, reaction tank, oxidation tank, sedimentation tank, transfer tank and filter press equipment, and uses calcium aluminate crystal lattice solidification method to treat wastewater: first, wastewater pH is adjusted to 7.0~8.0 by alkaline compound, then calcium source heavy metal removal agent A, oxidizing agent heavy metal removal agent B and aluminum source heavy metal removal agent C are added respectively, the pH of wastewater after reaction is controlled to 9.0~11.0, and the solid-liquid separation is carried out by filter pressing after 0.5h~1.5h continuous reaction.The method permanently fixes heavy metal ions in calcium aluminate crystal lattice through ion exchange, solves the problems of low efficiency, secondary pollution of sulfide and large amount of hazardous waste sludge in traditional chemical precipitation method, and realizes continuous and cooperative deep removal of sulfate and heavy metals.The filtrate meets the discharge standard, and the filter residue has no leaching toxicity, which can be used as foundation cushion and mine soil covering for secondary utilization.The method is efficient, low in cost, and suitable for industrial continuous treatment.

The utility model belongs to the field of water treatment, and particularly relates to a wastewater hardness removal system for nanofiltration coupling induced crystallization. The wastewater hardness removal system comprises a nanofiltration unit, a gypsum reactor and an ettringite reactor. Wherein the nanofiltration unit is configured to add a scale inhibitor into the wastewater, so that calcium ions and sulfate ions are supersaturated, and divalent salt is intercepted, so that the divalent salt is enriched on a nanofiltration concentrated water side; the gypsum reactor is communicated with a nanofiltration concentrated water liquid outlet of the nanofiltration unit and is configured to add an agent for destroying a scale inhibitor, so that calcium ions and sulfate ions are combined to produce calcium sulfate crystals; the ettringite reactor is communicated with the liquid outlet of the gypsum reactor, and is configured to add alkali and aluminum salt, further remove hardness of the liquid discharged from the gypsum reactor, and produce ettringite. Therefore, the consumption of the chemical agent is low, the subsequently added sodium carbonate can be reduced, meanwhile, the increase of ion concentration caused by adding the chemical softening agent is reduced, and the treatment pressure of a subsequent water treatment system is reduced.

This invention provides a method for quantitatively assessing the degree of sulfate attack on concrete, relating to concrete attack assessment technology, including: plotting SO4... 2‑ Concentration standard curve; determination of free SO4 in the sample. 2‑ Content, denoted as C （游离） Determine the total SO4 content of the same mass of test samples from the same source. 2‑ Content, denoted as C （总） C （总） With C （游离） The difference is the content of bound sulfate ions in the sample to be tested, denoted as C. （AFt，AFm） ; Calculate the bound sulfate content C per gram of the sample to be tested. 1 （AFt，AFm） :;C 1 （AFt，AFm） The value represents the amount of ettringite and monosulfide-type hydrated calcium sulfoaluminate formed. Using the formation of ettringite and monosulfide-type hydrated calcium sulfoaluminate as an evaluation index, the degree of sulfate attack on concrete is assessed. This method achieves a quantitative assessment of the degree of sulfate attack on concrete from the perspective of the chemical nature of the attack, and features accurate quantification, simple operation, and the ability to distinguish SO4. 2‑ Advantages such as shape.

The present application relates to solid waste resource utilization and carbon capture and utilization technical field, disclose a kind of using steelmaking waste gas to reduce the carbon sequestration treatment method of free calcium oxide of steel slag, comprising: steel slag, desulfurization gypsum, papermaking caustic white mud, waste building gypsum board powder and blast furnace water quenching slag are proportioned according to mass ratio, with mine acid wastewater to regulate alkaline slurry, into steelmaking waste gas and carry out wet carbonization disposal;During carbonization disposal, caustic white mud superfine particle is used as heterogeneous nucleation seed to accelerate f-CaO carbonization, three-way cascade supply guarantees uniform formation of ettringite, and mineral powder C-S-H gel is coated paper fiber and is converted into reinforcing phase;Carbonization product is obtained by pressure filtration dewatering and low-temperature drying.The present application realizes permanent mineralization and immobilization of steelmaking waste gas and efficient and complete digestion of f-CaO of steel slag, and multiple types of industrial solid waste and mine acid wastewater are disposed simultaneously, and the product can be used for mine filling and roadbed stabilizing material.

This invention discloses a fly ash-based fluidized solidification material, its preparation method, and its application. The fluidized solidification material is obtained by curing fly ash with a curing agent composed of an alkali-activated material, a cementing material, a water-reducing agent, and a filler. The alkali-activated material is sodium hydroxide or carbide slag; the cementing material is granulated blast furnace slag powder; the filler is desulfurized gypsum; and the water-reducing agent is sodium hexametaphosphate, magnesium lignosulfonate, or a mixture of both. The alkali-activated material has a synergistic activating effect on the Ca-Si-Al active components in the cementing material, promoting the formation of hydrated calcium silicate gel and ettringite crystal phases, strengthening the material's mechanical properties, and increasing the density of the pore structure. The water-reducing agent optimizes the hydration reaction process, reduces the water-ash ratio, and inhibits the system's tendency to shrink and crack. The desulfurized gypsum partially replaces the alkali-activated material, filling the material's pores, improving the material's unconfined compressive strength, and reducing the material's permeability coefficient. It can be used as an ex-situ barrier material with excellent mechanical properties, impermeability, and durability.

The invention relates to the technical field of concrete, and particularly discloses a modified steel slag mixture and a preparation method and application thereof, the modified steel slag mixture comprises modified steel slag, Portland cement, fly ash, silica fume, activated coal gangue and emulsified asphalt; the modified steel slag is prepared from the following raw materials: steel slag, phosphate modified graphene oxide, a polycarboxylate superplasticizer, water glass and sodium sulfate; the phosphate-modified graphene oxide is prepared from the following raw materials: organophosphate and graphene oxide. According to the invention, the P-GO is anchored on the surface of the steel slag, so that agglomeration of a nano material in a cement matrix is avoided. The anchored P-GO captures Fe < 3 + > dissolved out of the C2F in situ, and drives the C2F to be continuously dissolved; the dissolved Fe < 3 + > and Ca < 2 + > are quickly consumed by the water glass and the sodium sulfate, C-(F)-S-H gel and ettringite are generated, circulation is formed, and the problems of insufficient early strength and poor volume stability of the steel slag are synchronously solved.

The application belongs to the technical field of quick-setting agent preparation, and particularly relates to a production process for preparing a powdery quick-setting agent master batch from aluminum ash and aluminum slag; the production process for preparing the powdery quick-setting agent master batch from the aluminum ash and the aluminum slag comprises the following steps: hazardous waste pretreatment and aluminum particle separation and recovery, ingredient mixing and clinker preparation by calcination, clinker grinding and finished product packaging, and dust removal ash intelligent closed-loop recycling control; the composite activator added in the application can effectively adsorb and fix the chloride ions in the dust removal ash, smooth the fluctuations in the content of Al2O3 in the dust removal ash, induce the early and rapid generation of needle bar-shaped ettringite crystals in the cement paste, significantly shorten the initial setting and final setting times, improve the early mechanical strength, and effectively avoid the late strength reduction; the dust removal ash intelligent closed-loop recycling control step is combined with the composite activator, the recycling ratio is intelligently adjusted through online detection, the ingredient system component is accurately controlled, and the quality of the quick-setting agent master batch product is uniform and stable.

The invention belongs to the technical field of filling mining, and particularly relates to a preparation method of an early strength filling material based on temperature-sensitive microcapsules. The preparation method comprises the following steps: adding an early strength agent into a wall material-ethanol solution, stirring, cooling, centrifugally filtering and drying to obtain a temperature-sensitive microcapsule, and mixing the temperature-sensitive microcapsule with Portland cement, coal gangue, fly ash and water to obtain the early strength filling material. The early-strength filling material has remarkable advantages in the aspects of mechanical property, working performance and long-term stability, the early-strength agent wrapped by the microcapsules is triggered to release at a proper time and is subjected to a synergistic hydration reaction with a cementing material, the early-strength development track of a filling body can be remarkably improved, rapid generation of ettringite is effectively promoted through release of the early-strength agent, and the early-strength filling material has a good application prospect. And coal-based solid wastes such as the coal gangue and the fly ash are selected as raw materials, so that large-scale treatment and utilization of the gangue solid wastes are realized, and the method is green, economical and environment-friendly.

The invention discloses a coagulator applied to rapid hardening of a soft foundation road section, and belongs to the technical field of soil hardening treatment.The coagulator applied to rapid hardening of the soft foundation road section comprises, by weight, 40%-50% of solid waste building materials, 10%-20% of activated carbon loaded silicon dioxide, 15%-25% of desulfurized gypsum, 0%-3% of a water reducing agent and the balance cement, the solid waste building material comprises coal gangue, fly ash and blast furnace slag. Activated carbon loaded silicon dioxide is used as a raw material, the gel reaction rate is increased by using the hydrophilic and water-absorbing properties of the activated carbon loaded silicon dioxide, a hydrated calcium silicate gel and ettringite dual-crosslinking system formed through material composite design is improved, and a thin and soft muddy medium is converted into a hardened body with enough bearing capacity within 15-20 minutes at normal temperature; the problems of rapid stability and safe passing in a special construction environment are solved, and the safe, environment-friendly and low-carbon purposes of harmless and resourceful treatment of harmful resources are achieved.

The invention provides a concrete carbon sequestration material proportion optimization method, and belongs to the technical field of concrete carbon sequestration. Nitrogen fixation efficiency, sulfur fixation efficiency, carbon sequestration efficiency and pore liquid phase ion concentration distribution of each proportion are measured through a three-component gradient test matrix; inputting test data into a curing collaborative optimization model based on a matrix decomposition low-rank approximate optimization mechanism, outputting an optimization ratio vector and a gradient functional layer thickness parameter under multi-target constraint through singular value decomposition and an alternating minimization strategy, preparing a verification sample, and monitoring mechanical properties and ettringite delayed expansion rate; the secondary release risk of sulfate radicals is evaluated through a long-term leaching test, the mixing amount of the geopolymer exciting agent is adjusted, and the technical problem that when the concrete material fixes multiple pollutants at the same time, due to competitive adsorption among all components, the overall curing efficiency is difficult to synergistically improve is solved.

This invention relates to the field of mine backfilling applications, specifically to a CO2-solidified industrial solid waste-based slurry for mine backfilling, comprising the following raw materials in parts by weight: 85-105 parts solidifying agent, 15-22 parts sludge, 3-5 parts construction waste particles, 5-10 parts amine-functionalized porous material, 1.2-2.4 parts municipal solid waste particles, 0.5-2.5 parts rheology modifier, 0.1-0.5 parts setting regulator, and 0.1-0.5 parts defoamer; the solidifying agent, by weight percentage, includes 25-35 parts ettringite, 2-12 parts yellow phosphorus slag, 3-8 parts phosphogypsum, 4-16 parts modified fly ash, 3-10 parts desulfurized gypsum, 2-5 parts steel slag, and 3-5 parts tailings. By optimizing the solid waste combination and activation process, the slurry can actively adsorb / mineralize CO2 during the backfilling and solidification process, achieving the dual goals of increasing the strength of the backfill and reducing carbon emissions.

This invention belongs to the technical field of building waterproofing and leak-stopping materials, specifically relating to a leak-stopping material and its preparation method. The leak-stopping material of this invention comprises: powder and liquid components. The liquid component includes water. By mass parts, the powder comprises: 40-60 parts of sulfoaluminate cement, 10-20 parts of ordinary silicate cement, 15-25 parts of composite filler, 3.0-5.0 parts of ettringite precursor, 0.04-0.1 parts of water-reducing agent, 0.05-0.1 parts of hydroxypropyl methylcellulose ether, and 1.0-3.0 parts of penetrating crystallizing active powder. By mass parts, the liquid component comprises: 50-95 parts of deionized water and 5-50 parts of silicone-acrylic anti-permeability emulsion. The composite filler is fly ash modified with a silane coupling agent, and the particle size of the composite filler is 5-10 μm. The leak-stopping material of this invention has low water absorption, excellent corrosion resistance, good mechanical properties, and durability.

The invention provides dry-mixed plastering mortar containing aluminum electrode corrosion foil waste and a using method of the dry-mixed plastering mortar, and belongs to the technical field of solid waste resource utilization. Calcium hydroxide generated by hydration of cement, calcium sulfate and aluminum hydroxide in the aluminum-containing electrode corrosion foil waste and silicon dioxide and aluminum oxide in the fly ash are utilized to generate calcium silicate, calcium aluminate and ettringite gel with cohesiveness and water resistance, and the expansion performance of the ettringite gel is utilized to improve the water resistance of the aluminum-containing electrode corrosion foil waste. The cohesiveness and the strength of the mortar are further enhanced, and the crack resistance and the water resistance of the mortar are improved; by adding the water reducing agent and the air entraining agent, the dispersity of the raw materials is improved; by adding the air entraining agent and the fiber, the crack resistance and the toughness are improved.

The invention provides early-strength self-expanding corrosion-resistant cement and a long-term performance stabilizing method thereof. The high-sulfur high-calcium iron-rich phase low-carbon corrosion-resistant cement clinker is prepared by taking phosphogypsum, steel slag powder, salty mud, limestone and alumina as raw materials, 1200 DEG C isothermal heat treatment is innovatively embedded in a clinker quenching process, and the overall mechanical property is optimized; and meanwhile, auxiliary cementing materials such as limestone mine tail powder, lithium slag powder and desulfurized gypsum are mixed and matched with the cement clinker according to the close packing idea to achieve the close packing effect, and the overall mechanical property and durability of the material are guaranteed. The iron-type ettringite nucleation induction-morphology stability improver prepared by the invention can induce generation of iron-type ettringite in a clinker hydration process, improve the early strength of a composite cementing material, change the problem of volume / strength shrinkage of aluminum-rich phase cement in a long-term maintenance process, and further ensure the long-term performance of the composite cementing material.

The application discloses a kind of nano ettringite particles reinforced aramid nanofiber aerogel and its preparation method and application, belong to aerogel technical field.The preparation method provided by the application includes the following steps: calcium source, aluminum source and sulfate are dissolved in water, first surfactant is added, pH is adjusted to 9~12, stirring reaction, after reaction, the solid product is washed to neutral to obtain nano ettringite particles;The nano ettringite particles, para-aramid nanofiber, second surfactant and crosslinking agent are stirred uniformly in water, to obtain ettringite / aramid nanofiber dispersion;The ettringite / aramid nanofiber dispersion is concentrated, directional freezing and freeze-drying in turn, and is obtained.The preparation method of the application is simple, and raw material is easy to obtain, and the obtained nano ettringite particle reinforced aramid nanofiber aerogel has higher mechanical strength and thermal stability.

This invention relates to the field of high-efficiency expansive agent technology, and in particular to a slow-release high-efficiency expansive agent for concrete, its preparation method, and its application. The method includes the following steps: crushing limestone, bauxite, hematite, gypsum dihydrate, magnesite, and silica, then ball-milling and sieving to obtain a mixed raw material powder; heating to 650-850℃ and holding for 20-40 minutes, then raising the temperature to 950-1200℃ and holding for 30-60 minutes, continuing to raise the temperature to 1250-1300℃ and holding for 40-70 minutes, and finally cooling to 150-200℃ to obtain clinker; mixing the clinker powder with anhydrite until uniform, adding admixtures and a hydration regulator / activator, and grinding; adding a slow-release coating agent via high-pressure atomization spray, and stirring to obtain a fine mixed powder; mixing and aging in a homogenization chamber to obtain the slow-release high-efficiency expansive agent. The slow-release high-efficiency expansive agent of the present invention gradually generates calcium hydroxide and ettringite crystals to provide efficient compensation when the cement hardened body begins to shrink, and achieves continuous micro-expansion throughout the process by relying on later expansion sources such as periclase.

The invention relates to a carbonized wet-ground steel slag-lithium slag-based composite admixture and application thereof, and belongs to the technical field of solid waste recycling and green building materials. The composite admixture is liquid slurry prepared from steel slag powder and lithium slag powder through a carbonization-wet grinding synergistic activation process. According to the main process, mechanical grinding and chemical carbonization reaction are synchronously carried out, and microbubbles generated by decomposition of ammonium bicarbonate are supplemented to enhance mass transfer. In the process, free oxides in the steel slag are converted into stable carbonate, a silicon-aluminum network of the lithium slag is depolymerized, and the stable carbonate and the lithium slag cooperate to generate compact gelling products such as calcite, ettringite and AFm-like substances, so that the material activity is improved, and meanwhile, the problems of poor stability and high-sulfur expansion risks are fundamentally solved. The product can be used as a functional liquid cementing material, and is added instead of part of mixing water during concrete mixing, and high-performance low-carbon concrete is prepared after curing; and large-scale high-value utilization of the steel slag and the lithium slag is realized.

The invention discloses a preparation method of a special roadbed material based on component complementation and synergistic excitation. The method comprises the following steps: carrying out gradient pretreatment on ardealite and concrete waste slag; preparing a composite gel system; and mixing and molding roadbed materials. The invention has the following beneficial effects: a synergistic excitation enhancement mechanism: SO4 < 2-> in ardealite and unhydrated C3A, C4AF and active silica-alumina components in sprayed concrete waste slag are utilized to continuously generate stable ettringite under the action of a composite activator, and the stable ettringite and C-S-H gel form an interpenetrating network structure, so that the problem of insufficient bonding strength of single solid waste is solved, and the problem of low bonding strength of the single solid waste is solved; compared with the prior art, the 28-day compressive strength is improved by 30-50%; targeted performance optimization: through organic functional hydrophobic modification, inorganic material pore filling and fiber bridging effects, high compactness and a synergistic effect of phosphogypsum micro powder, the elastic modulus reaches 2500-3000 MPa, and heavy-load vehicle impact and earthquake load are resisted; the solid waste utilization rate and the environmental protection value are high, and the total mixing amount of the two solid wastes can reach 95% at most.

The application relates to the technical field of building materials, and discloses a fluidized solidified soil and a preparation method thereof. The fluidized solidified soil provided by the application comprises the following raw materials in parts by weight: engineering slag 85-90 parts; desulfurization gypsum 2-5 parts; kiln dust 3-6 parts; and slag 5-12 parts. The specific microalkalinity and slow-release characteristics of the kiln dust are used to slowly release Ca 2+ with OH ‑ , the alkalinity and ion environment of the desulfurization gypsum are cooperatively regulated, Ca, Si and Al ions in the slag are gradually dissolved in the weak alkaline environment, a stable ettringite structure is generated, the early structure construction of the system is improved, and C-S-H, C-(A)-S-H gel and other cementing phases are formed to provide main cementing strength for the system, and the slurry cohesiveness and flow retention can be improved.

The application relates to the technical field of cement materials, and particularly discloses a high ore fused stone ferrite aluminate cement material and a preparation method thereof. The cement material is prepared by jointly grinding and treating high belite ferrite aluminate cement clinker and a modifier. The modifier is composed of succinyl phosphonate, a quaternary ammonium salt and an aluminum source. The molecular formula of the succinyl phosphonate is HOOC-CH2-CH2-CO(PO3H2). The modifier composed of succinyl phosphonate, a quaternary ammonium salt and an aluminum source is used to perform mechanochemical coupling modification on the belite ferrite aluminate cement clinker, multi-level interface interaction occurs under the induction of mechanical force, directional poisoning and growth inhibition of calcium aluminate crystal nuclei are realized, the early strength of the cement is maintained, and the volume stability of the cement material is significantly improved.