3714 results about "Cement" patented technology

The invention relates to the technical field of engineering construction control, in particular to a self-adaptive control method and system for a cement mixing pile, and the method comprises the steps: setting the slurry preparation ratio parameter of a slurry preparation barrel of a feeding hopper according to the working information of the cement mixing pile, and conveying the prepared slurry to a slurry storage barrel of a discharging hopper; collecting a slurry static pressure signal of a slurry storage barrel of the blanking hopper, and monitoring the load dynamic characteristics of a stirring motor of the blanking hopper in real time in the stirring process; the slurry spraying quality parameters of the slurry are analyzed, and when the slurry spraying quality parameters reach the preset feeding standard, the slurry is conveyed to a slurry spraying pipeline to be matched with a cement mixing pile for pile forming work; when the guniting quality parameter exceeds the interval of the feeding standard, a real-time matching error is obtained; and generating a ratio correction instruction to correct the pulping ratio parameters. According to the invention, the dynamic closed-loop control of the pile forming quality of the cement mixing pile under the complex geological condition is effectively realized, and the industry bottleneck that the traditional open-loop proportioning system cannot respond to the slurry state change in real time is broken through.

To provide a concrete composition with a portion of aggregate thereof replaced with carbonate light aggregate, excellent in fresh characteristics and in post-curing strength and freeze damage resistance.SOLUTION: An aspect of the present invention relates to a concrete composition including (a) cement, (b) coarse aggregate, (c) fine aggregate, (d) granulated carbonate light aggregate of alkali earth metal, (e) and water, where the carbonate light aggregate has a cumulative pore volume of 0.06 mL / g or more, each pore having a pore size of 100 nm or less.SELECTED DRAWING: None

The invention provides a low-carbon concrete coarse aggregate close packing combination grading formula and a determination method, and relates to the technical field of building materials, the formula comprises a coarse aggregate skeleton, a fine aggregate, a low-carbon cementing material, water and an admixture, the coarse aggregate skeleton is composed of four different size fractions, and the purpose is to achieve the closest packing to reduce the cement requirement and improve the cement quality. The low-carbon cementing material is composed of cement, a conventional low-carbon mineral admixture and a low-carbon composite mineral admixture, and the low-carbon composite mineral admixture comprises an active component A and a micro-filling component B. The determination method comprises the steps of system characterization and model establishment, slurry skeleton iterative collaborative optimization and formula determination. The porosity is reduced to the maximum extent by optimizing coarse aggregate grading, the cement consumption is greatly reduced, meanwhile, through the synergistic effect of the high-performance, high-proportion and low-carbon admixture, the working performance, physical and mechanical properties and durability of the concrete are ensured, carbon emission and material cost are remarkably reduced, industrial solid waste is effectively utilized, and the economic benefit is increased. And green low-carbon preparation of the concrete is realized.

The invention relates to the technical field of building materials, in particular to anti-crack mass concrete and a preparation method thereof, and the concrete is prepared from a gelling system, composite aggregate, a gradient functional additive and water according to a specific ratio. The preparation method is achieved through premixing, gradient stirring and gradient temperature control curing, the three-stage expansion effect of the compound expanding agent is utilized to be matched with the concrete shrinkage process, the hydration heat inhibitor is combined for reducing the temperature peak, basalt fiber is used for reinforcing, and the cracking risk is quantitatively evaluated, so that the 28-day restrained expansion rate of the concrete reaches 0.012% or above, the cracking risk coefficient is smaller than or equal to 0.7, and the concrete has the good crack resistance. The hydration heat peak value is reduced to 48 DEG C or below, and the cement is suitable for engineering of ultra-long structures, large-volume side walls and the like, has no harmful cracks within one year or above, has crack resistance and mechanical properties, and is wide in application prospect.

The invention discloses a preparation method of a green high-performance industrial solid waste-based grouting material, and belongs to the field of industrial solid waste treatment and grouting reinforcement, and the preparation method comprises the following steps: performing dry mixing on red mud, slag, fly ash and cement which are dried and ground to specified fineness according to a preset proportion to obtain a uniform dry material; preparing a composite alkali activator from water glass and sodium hydroxide according to a molar ratio of 3: 1, premixing the composite alkali activator with water, and adding the dry material in batches to form wet slurry; and carrying out high-speed shearing and stirring on the wet slurry, and standing and curing to obtain the solid waste-based slurry which can be directly used for grouting. The method obviously improves the solid waste utilization rate, relieves the environmental pressure, and is suitable for related projects such as stratum settlement control, gushing water blocking, mine roadway broken rock mass supporting and underground cavity concrete lining crack repairing in tunnel and subway projects.

The invention relates to the technical field of tunnel engineering building materials, in particular to a double-slurry synchronous grouting material based on shield silty-fine sand and a preparation method of the double-slurry synchronous grouting material based on shield silty-fine sand. The liquid A is prepared from, by weight, 20%-30% of cement, 30%-50% of shield silty-fine sand, 5%-10% of bentonite, 5%-15% of mineral admixture, 0.1%-0.5% of stabilizer and 20%-30% of water, and the stabilizer is a water-soluble high-molecular polymer; the solution B is a water glass solution, and the volume ratio of the solution A to the solution B is (10-15): 1; the double-slurry synchronous grouting material further comprises a retarder and a coagulant, the retarder is citric acid, and the coagulant is a nano Ca (OH) 2 crystal nucleus. Bidirectional and gradient regulation and control of the gelation time between 5s and 100s can be realized through the coagulant and the retarder, and diversified requirements of different geological conditions and construction progress on slurry operation time are met.

The invention provides a real-time early warning method and system for ash conveying equipment, and the method comprises the steps: collecting the operation parameters of the ash conveying equipment in real time, including the material level of an ash hopper, the pressure of an ash conveying pipeline, the environment temperature and a pipeline vibration signal; performing dynamic weight fusion on the equipment operation parameters to generate a comprehensive working condition index; analyzing and predicting the change trend of the comprehensive working condition index based on the time sequence; when the change trend exceeds a preset safety range, generating a graded early warning signal and triggering a corresponding disposal instruction; according to the graded early warning signal, the parameter weight and the early warning rule of dynamic weight fusion are automatically optimized, the comprehensive working condition index is generated through coupling of various operating parameters, and then the change trend is predicted to carry out graded early warning, so that compared with a single parameter early warning mode, the accuracy of the fault early warning of the ash conveying equipment is effectively improved.

The invention relates to the field of hazardous waste treatment, in particular to a treatment method for mineralization and chlorine fixation of waste incineration fly ash and a waste incineration fly ash solidified body. The treatment method comprises the following steps that S1, the incineration fly ash is subjected to homogenization treatment, and homogenized fly ash is obtained; s2, the homogenized fly ash is detoxified through plasma treatment, dioxin on the surface of the homogenized fly ash is removed, and detoxified fly ash is obtained; and S3, stirring the detoxified fly ash, a mineralizing agent and water, carrying out shock excitation, carrying out pouring molding, standing, and demolding to obtain the waste incineration fly ash solidified body. According to the method, the incineration fly ash is dispersed through homogenization treatment, dioxin on the surface of the homogenized fly ash is removed through plasma treatment, finally, fly ash particles are tightly wrapped and cemented through cooperation of a mineralizing agent and water, a compact network structure is formed, the leaching toxicity of heavy metal is reduced, soluble chloride ions are chemically fixed in crystal lattices of minerals, and the leaching efficiency is improved. The incineration fly ash mineralization and synergistic chlorine fixation effects are realized.

The invention belongs to the technical field of pavement repairing, and discloses a material mixing and grouting integrated cement concrete pavement repairing device which comprises a frame, an adjusting assembly is arranged on the front face of the frame, a vibration assembly is arranged at the bottom of the adjusting assembly, and the vibration assembly comprises a fixing rod. According to the device, through cooperation of structures such as the vibration assembly and the supporting wheels, a knocking hammer of the vibration assembly is driven to knock a grouting area range in the moving process, mortar air injected into the device can be discharged through knocking vibration, and the device is convenient to use. According to the mortar filling device, mortar can permeate into gaps, filling uniformity is guaranteed, the vibration effect can be achieved through knocking, air of the mortar can be effectively emptied, meanwhile, the mortar can be prevented from overflowing, the flatness of the surface after the gaps are filled with the mortar can be guaranteed, and meanwhile grouting uniformity can be guaranteed.

The purpose of this invention is to provide a method for preparing cemented backfill materials based on response surface methodology using composite activating coal gasification slag. This method belongs to the field of mining engineering technology. Based on sorting and removing impurities from the coal gasification slag and drying it, the invention obtains ultrafine powder of the coal gasification slag for preparing the backfill material through ball milling. Then, coal gangue is crushed and screened using a crusher to obtain coarse, medium, and fine aggregates for the backfill material. Finally, cement, ultrafine coal gasification slag powder, coal gangue aggregate, activator, and water are mixed evenly to prepare the cemented backfill material. This invention not only solves the problem of low activity of coal gasification slag volcanic ash but also effectively controls the shortage of cemented backfill materials and high backfilling costs during cemented backfill mining, ensuring sustainable development. Furthermore, it effectively utilizes the widely accumulated coal gasification slag, reducing pollution and large-scale land occupation of the surrounding environment.

The invention discloses a cement wall prefabricating drilling device for building construction, and relates to the technical field of building construction equipment, the cement wall prefabricating drilling device for building construction comprises a supporting bottom plate and further comprises a first drilling mechanism, and the first drilling mechanism is located above the supporting bottom plate. Therefore, the first drilling operation table is driven to be adjusted in the overall direction, the drilling requirements of different directions are met, the equipment use flexibility of overall drilling operation is improved, and the device is suitable for various scenes. According to the drilling equipment, the driving adjusting mechanism is arranged, large particles cannot enter a fixing box, recycling treatment is conducted through a recycling box at the bottom, classified storage is conducted on equipment needed on site through a classified storage box, drilling modes of different states are switched according to drilling scene needs, and the drilling efficiency is improved. And meanwhile, the functions of storage of equipment required during drilling, field environment purification during drilling, field equipment movement and the like are integrated.

The application belongs to the field of concrete, and discloses a low-carbon and environment-friendly ultra-high performance concrete and a preparation method thereof.The low-carbon and environment-friendly ultra-high performance concrete comprises the following raw materials in parts by weight: 13-23 parts of water, 50-70 parts of cement, 5-15 parts of silica ash, 100-138 parts of fine aggregate, 20-50 parts of quartz powder, 5-12 parts of reinforcing fiber, 1-5 parts of additive, 0-0.5 parts of calcium polyacrylate (CPA), and 0-0.2 parts of silane coupling agent.The low-carbon and environment-friendly ultra-high performance concrete provided by the application can greatly reduce the dosage of cement, silica ash and other cementitious materials and the dosage of fiber compared with traditional ultra-high performance concrete, but still maintains excellent mechanical properties and durability.

The invention discloses a cement-based telegraph pole defect detection method based on big data analysis, and the method comprises the steps: arranging a distributed optical fiber sensing network to collect the stress data of a target telegraph pole, and obtaining a stress feature set through denoising and feature extraction; constructing a structure damage feature library based on the attributes of the telegraph pole and the material characteristics, and screening key damage features through a self-adaptive matching threshold value; and in combination with concrete carbonization characteristics and steel bar corrosion characteristics, carrying out weighted analysis by adopting a multi-modal fusion model and an attention mechanism, and outputting an optimally matched defect detection result. According to the method, through multi-source data fusion and dynamic threshold optimization, the recognition precision of typical damages such as cracks and spalling is remarkably improved, a graded early warning and maintenance scheme can be automatically generated according to a detection result, and intelligent monitoring and operation and maintenance of the health state of the telegraph pole are achieved; the method has the characteristics of high detection accuracy and strong environmental adaptability, and is suitable for long-term safety monitoring of the electric power infrastructure.

The invention discloses a polymer emulsion composite modified road base material and a preparation method thereof, and belongs to the technical field of traffic infrastructure engineering materials. The polymer emulsion composite modified road base material is prepared from the following raw materials: graded aggregate, super sulfate cement or geopolymer cement, water for mixing, vinyl acetate-ethylene (VAE) copolymer emulsion and a silane coupling agent. The preparation method comprises the following steps: mixing the VAE emulsion with water for mixing to obtain a polymer diluent; mixing graded aggregate with an inorganic cementing material, then adding the polymer diluent, and mixing to obtain a mixture; and then paving, compacting, forming and curing are carried out. By forming a VAE flexible network-C-S-H / ettringite hybrid network, the material has the remarkable advantages of higher mechanical strength and low cost, and can greatly improve and enhance the crack resistance and durability of the road base.

This invention discloses a heat-insulating and heat-resistant shotcrete and its preparation method. This heat-insulating and heat-resistant shotcrete is composed of cement, modified silica mortar, modified heat-insulating ceramsite, fine aggregate, water, admixtures, and accelerators. In this invention, high-strength shale ceramsite with surface modification using hydrogel is introduced as a heat-insulating filler, significantly improving the dispersion and stability of lightweight aggregate in the mortar. It also possesses strong water absorption and slow-release capabilities and surface sealing functions, enabling it to provide pore insulation and internal curing through water storage and release in high-temperature environments. The addition of modified silica mortar, which effectively improves the high-temperature stability and density of the mortar hydration products, comprehensively enhances the homogeneity of the shotcrete mixture, the heat insulation performance of the hardened body, and the strength development and durability under high-temperature conditions. This effectively improves tunnel chamber temperature and extends the service life of the shotcrete under high-temperature conditions. The heat-insulating and heat-resistant shotcrete technology has a clear working mechanism, simple production process, and excellent performance. It is suitable for large-scale production and is of great significance for the high-quality construction of underground projects such as tunnels and mines in high-temperature and high-temperature water inrush environments.

The invention discloses an anti-sulfate-attack preparation method of solid waste concrete, and relates to the technical field of building materials and civil engineering, the anti-sulfate-attack solid waste concrete is prepared from the following materials in parts by weight: 100 parts of cement, 30-50 parts of composite solid waste cementing material, fly ash, steel slag micro powder and coal gangue according to a given mass ratio, 60-80 parts of modified recycled aggregate; 0.05-0.1 wt% of sodium molybdate as an erosion inhibitor. According to the invention, solid waste activation-interface reconstruction-ion competition-structure self-healing is taken as a core, synchronous spanning of solid waste concrete in the dimensions of sulfate erosion resistance, resource consumption, construction convenience and the like is realized through multi-process collaboration, and the gelation potential of solid wastes such as fly ash and steel slag is accurately excited through microwave targeted activation, so that the construction efficiency is improved. And a dense microstructure is reconstructed by combining a nano-SiO2 induced crystallization technology, so that excellent mechanical properties are still ensured when the solid waste mixing amount exceeds 70%.

This invention relates to the field of novel low-carbon composite cement and solid waste resource utilization technology, specifically to a red mud-based low-carbon composite cement and its preparation method. The raw materials for this red mud-based low-carbon composite cement include red mud, auxiliary cementitious materials, gypsum-based solid waste, alkali activator, retarder, and interface reinforcing agent. It possesses compressive strength comparable to or even higher than 425 or 525 cement, with a red mud content ≥30wt% and an alkali activator content as low as 3wt%–8wt%. This not only achieves large-scale resource utilization of red mud but also significantly reduces production costs. Simultaneously, the cement hydration products have a good shielding effect against radioactivity, ensuring that the radioactivity of the hardened cement still meets national standards even with the large-scale incorporation of red mud. Moreover, the preparation method of this cement is simple, requiring neither red mud dealkalization nor high-temperature calcination, truly achieving low-carbon, low-energy-consumption, and low-cost green and environmentally friendly cement production.

The invention discloses an inorganic normal-temperature rapid-hardening coal-rock mass reinforcing and filling material, and relates to the technical field of mine reinforcement. The material comprises a liquid A and a liquid B, the liquid A is prepared from cement, fly ash, magnetic nano silicon dioxide, citric acid and a layered bimetal oxide-sodium hexametaphosphate compound; and the liquid B comprises water glass, superfine limestone and water. During use, the liquid A and the liquid B are mixed according to the volume ratio of 1: 1 and injected into a target area, and a 1.5 Tesla magnetic field is applied at the initial stage of grouting until the grout is initially set. Through the synergistic effect of the compound protection dispersing agent, the magnetic particles and an external magnetic field, the technical problems that an existing material is unstable in performance due to temperature change, nanoparticles are prone to agglomeration, and magnetic response is attenuated in an alkaline environment are effectively solved; the technical effects of rapid solidification, high strength and excellent durability in high-temperature, low-temperature and complex mine environments are achieved.

This invention discloses a continuous, high-efficiency, automatic dry-mixed mortar preparation equipment, relating to the field of mortar preparation technology. It includes a sand drying device and a feeding hopper. A sand particle screen is installed on one side of the sand drying device, and a screw conveyor connects the sand drying device and the sand particle screen. The dried sand enters the sand particle screen via the screw conveyor. Under the action of a first and second uniform material assembly, the mortar on the first conveyor belt consists of coarse sand, fine sand, cement, and filler laid out in sequence. Because the fine sand can fill the gaps in the coarse sand, reducing the relative movement space of the coarse sand and increasing internal friction, the cement and filler can be positioned on top of the coarse and fine sand. The dry-mixed mortar is stacked in a layered structure in a packaging bag using an anti-segregation telescopic tube, reducing stratification during bagging and transportation after mortar preparation, and reducing the mixing time between the mortar and water in the later stages.

The invention relates to a high-performance reactive asphalt cold patch mixture and a preparation process thereof. The mixture comprises a sulfonated fatty acid diluent, a graded aggregate, an atomic layer deposition (ALD) modified basalt aggregate and a solid waste-based composite curing agent. The sulfonated fatty acid diluent is prepared by sulfonating oleic acid, linoleic acid and palmitic acid through sulfamic acid, the sulfonation degree is 15-20%, and the sulfonated fatty acid diluent contains an epoxy three-membered ring structure; the 3-5mm aggregate is used as a transition layer to block the caking path of the fine aggregate; the basalt aggregate is subjected to TDMAT and TMA alternate deposition to form a Ti < x > Al < gamma > O < 2 > nano film; the curing agent comprises calcium strontium sulphoaluminate minerals, a titanium gypsum-carbide slag compound and magnesium-loaded lithium slag. During preparation, the modified aggregate, the sulfonated diluent and the curing agent are mixed at normal temperature. The problems that a traditional cold repairing material is poor in low-temperature fluidity and weak in interface bonding are solved, the viscosity at-20 DEG C is smaller than or equal to 450 mPa.s, the 7-day strength is larger than or equal to 5.2 kN, and the cold repairing material is suitable for low-temperature emergency repairing.

Methods of capturing carbon in biochar are provided. The method includes mixing the biochar with an alkaline solution to form an intermediate mixture, and exposing the intermediate mixture to a CO2 source to precipitate calcium carbonate over and in the biochar to form a CO2 weathered biochar. In some cases, the method further includes injecting CO2 into the alkaline wastewater to sequestration / store CO2, which may then be used as mixed water for the production of cementitious composites. The method can be used for upgrading three waste streams, and the treated CO2 weathered biochar maintains the compressive strength of the obtained concrete when replacing part of the pre-cured cement and aggregate components. In addition, the treated CO2-weathered recycled aggregate maintains the mechanical strength of the obtained concrete when replacing part of the aggregate.

A method of sealing a lost circulation zone may include: circulating a lost circulation treatment composition to a subterranean formation comprising a lost circulation zone, wherein the lost circulation treatment composition comprises: a carrier fluid; a polymeric additive; a fine particulate component; and a composite particulate component containing size and shape selected materials; wherein the cost circulation treatment composition has the property of allowing full volume passage through a 15,000 micron fracture width; flowing the lost circulation treatment composition into the lost circulation zone; and plugging the lost circulation zone using the lost circulation treatment composition.

This invention provides a SiO2 aerogel / magnesium oxysulfate cement-based thermal insulation mortar and its preparation method. The thermal insulation mortar material includes components A, B, C, and D. Component A includes 65 parts of lightly calcined magnesium oxide and 5-50 parts of silica aerogel. Component B includes 25-35 parts of magnesium sulfate heptahydrate, 0.1-1 parts of modifier, 0-3 parts of reinforcing agent, 26-32 parts of water, 0-3 parts of thickener, and 0-3 parts of water-repellent agent. Component C includes 60-650 parts of water and 1-15 parts of dispersant. Component D includes 0-20 parts of inert filler, 0-30 parts of pre-formed foam, and 0-5 parts of fiber. The large-volume aerogel in the SiO2 aerogel / magnesium oxysulfate cement-based thermal insulation mortar provided by this invention can be uniformly dispersed in the cement-based material without interfacial delamination, and has advantages such as high strength, lightweight, good thermal insulation performance, and high softening coefficient.

The invention discloses a cement concrete pavement slurry lifting thickness real-time detection and control method, and relates to the technical field of concrete thickness control, and the method comprises the following steps: starting a system, and setting a target thickness and a vibration parameter initial value; the radar sensor array transmits and receives concrete surface layer reflection signals at high frequency; de-noising and feature extraction are carried out on the reflected signal, and a feature vector is constructed; a physical information neural network model is utilized to process the feature vectors, and the current slurry thickness is inversed in real time; the deviation between the current thickness and a target value is calculated, and a control decision is made; vibrating equipment is adjusted in real time; real-time data and states are displayed on the terminal, and when the thickness is insufficient, an alarm is triggered and construction is suspended; construction data and logs are automatically stored, and a quality report is generated for tracing analysis. By integrating the high-frequency geological radar sensor array and the physical information neural network inversion algorithm, accurate sensing of the cement concrete slurry extraction thickness and automatic adjustment of vibration parameters can be achieved.

The invention relates to the field of concrete design, and particularly discloses stone powder-containing machine-made sand concrete and a corresponding mix proportion design method. The method comprises the steps that the use amount of coarse aggregate, fine aggregate and a cementing material of concrete is calculated, the fine aggregate stone powder-containing machine-made sand is subjected to rapid screening, the stone powder content of the fine aggregate stone powder-containing machine-made sand is measured, all the stone powder-containing machine-made sand is counted into the cementing material, part of cement, fly ash and mineral powder are replaced, a cementing system is formed, 10%-20% of the cement is replaced with the cement, and the remaining part of the cement is replaced with the fly ash and the mineral powder; calculating a strength influence coefficient under the specific cement replacement ratio of the stone powder by adopting a formula gamma Lf =-3.16 x-0. 048 x + 1, and calculating the mortar strength of the gelling system according to the strength influence coefficient; and adjusting and determining the water consumption meeting the preparation strength requirement, and finally determining the dosage of each component of the concrete. The stone powder in the powder-containing machine-made sand serves as a gelling component, efficient resource utilization of the machine-made sand with the high stone powder content is achieved, the use amount of cement and coal ash is reduced, and the problem that concrete is not low in carbon for a long time is solved.

The invention discloses geopolymer cement based on coal gangue activation reaction as well as a preparation method and application thereof, and relates to the technical field of building materials. The invention relates to a coal gangue concrete, which is prepared from the following raw materials in percentage by mass: 50 to 70 percent of activated coal gangue powder, 5 to 15 percent of alkali activator, 10 to 30 percent of auxiliary cementing material and water, wherein the water accounts for 30 to 40 percent of the total mass of the activated coal gangue powder, the alkali activator and the auxiliary cementing material. Through a composite activation process of medium-temperature calcination decarburization and superfine grinding, the activity of silicon-aluminum components in the coal gangue is effectively excited, the reaction efficiency is remarkably improved, the mixing amount of the coal gangue reaches 50%-70%, the resource utilization rate of solid waste is greatly increased, and efficient activation and resource utilization of the coal gangue are achieved. By adopting the methyl sodium silicate and sodium silicate composite activator, the reaction rate and the product structure are regulated and controlled, and the workability and the setting and hardening behaviors of slurry are improved, so that the obtained geopolymer cement has relatively high early and later strength and excellent durability.

The invention discloses a cement production equipment fault early warning method and system, and relates to the technical field of cement production equipment health monitoring, and the method comprises the steps: building a cylindrical coordinate system on the surface of a rotary kiln cylinder, and dividing the cylindrical coordinate system into a plurality of independent visual monitoring surface elements; collecting infrared and visible light image sequences in multiple working conditions and multiple continuous rotation periods for each visual monitoring surface element in a healthy state, and constructing a healthy visual fingerprint reference library representing stable state characteristics of the visual monitoring surface element; according to the method, the rotary kiln cylinder visual monitoring surface elements are divided, the healthy visual fingerprint reference library is constructed, real-time accurate comparison is achieved in combination with the twin neural network, cylinder state monitoring can be comprehensively covered, and limitation of local monitoring is avoided; and through time sequence deviation degree calculation and spatial correlation analysis, the deterioration trend and spatial correlation characteristics of the fault precursor can be captured in an early stage, and the early warning timeliness is greatly improved.

The invention relates to a waste incineration fly ash artificial aggregate and a preparation method thereof. The method comprises the following steps: uniformly mixing the waste incineration fly ash, cement and fly ash, then adding water, and uniformly stirring to obtain an aggregate mixture; placing the aggregate mixture in a mold for compression molding to obtain a molded product; the compression molding comprises the following steps: pre-pressing for 10-20 seconds at 6-10 MPa, then pressing for 20-40 seconds at a medium pressure of 12-18 MPa, then uniformly increasing the pressure to a high pressure of 22-28 MPa, and maintaining the pressure for 4-6 seconds at the high pressure of 22-28 MPa; and performing standard curing on the molded product, demolding to obtain a demolded sample, and sequentially performing crushing treatment and steam curing to obtain the waste incineration fly ash artificial aggregate. The prepared waste incineration fly ash artificial aggregate is low in crushing value, low in water absorption rate, high in strength and high in heavy metal curing capacity, a feasible path is provided for resource utilization of waste incineration fly ash, and the waste incineration fly ash artificial aggregate has important environmental protection value and economic value.

The application discloses a recycled concrete chloride ion diffusion coefficient prediction model based on pore structure random fractal characteristics and a construction method and application thereof, relates to the technical field of a recycled concrete chloride ion effective diffusion coefficient prediction model construction, and provides the recycled concrete chloride ion diffusion coefficient prediction model, studies transmission channels influencing recycled concrete chloride ion transmission on a mesoscopic scale, and constructs the above model on a macroscopic scale based on the mesoscopic transmission channels. The model analyzes the recycled concrete chloride ion diffusion performance on multiple scales from the mesoscopic scale to the macroscopic scale, can more accurately predict the chloride ion effective diffusion coefficient according to pore structure related data of a cement-based material, and provides reference and guidance for durability research of the recycled concrete.

The invention relates to the technical field of ardealite treatment technology, and discloses a method and a system for harmless treatment of ardealite, which are characterized in that fresh ardealite discharged by wet-process phosphoric acid filtration is re-pulped and then sequentially passes through a first-section reaction tank (added with fly ash and cement), a tank A of a second-section reaction tank, a tank B of the second-section reaction tank and a tank C of the second-section reaction tank for continuous reaction; performing solid-liquid separation to obtain harmless phosphogypsum; after the filtrate is settled, supernate is reused for repulping and lime milk preparation, and thick slurry is returned to the reaction tank; the reaction waste gas is washed with phosphoric acid acidic water, and washing liquid is reused for ore grinding; through multi-stage reaction and accurate pH control, the phosphogypsum stably reaches the class I solid waste standard, and the curing time is shortened from traditional several days to several hours; the system is deeply coupled with a front-end phosphoric acid system, and water balance and resource circulation of the system are realized by optimizing and filtering a washing water source and recycling steam condensate water; the process has the advantages of low cost, stable quality and flexible operation.