749 results about "Pulverised fuel ash" patented technology

The invention discloses crack-chloride ion double-triggered subsea tunnel corrosion-resistant concrete and a preparation method thereof, and relates to the field of subsea tunnel engineering materials. The concrete is prepared from the following components in parts by weight: 400 to 500 parts of Portland cement, 50 to 80 parts of fly ash, 60 to 100 parts of superfine mineral powder, 1000 to 1100 parts of coarse aggregate, 700 to 800 parts of fine aggregate, 140 to 160 parts of water, 10 to 20 parts of self-repairing microcapsules and 1 to 5 parts of a water reducing agent, the self-repairing microcapsule comprises a capsule wall material, a self-repairing material and a layered dihydroxyl composite metal oxide. A crack-chloride ion double-response system is constructed, and the limitation of traditional single trigger repair is broken through. When a crack with a certain width appears in the concrete, the capsule wall of the self-repairing microcapsule is broken to release the repairing component, so that effective filling of the crack is realized; and meanwhile, the layered double-metal hydroxide can directionally adsorb chloride ions to form a stable compound, so that the migration rate of the chloride ions is remarkably reduced.

The present invention belongs to the field of resource utilization of building materials and solid waste, and relates to a red-mud-based cementing material based on efficient drying, component homogenization and activity improvement, and a preparation method therefor. The preparation method comprises: adding a filter aid to red mud to carry out sedimentation, then subjecting same to filter pressing until the water content is 14-16%, then drying the solid material, which has been subjected to filter pressing, until the water content is 4% or below, and finally grinding same to obtain the product. The filter aid comprises the following raw materials: 10-30 parts of polyaluminum chloride, 5-15 parts of polyaluminum sulfate, 1000-1200 parts of blast furnace slag or fly ash, 700-900 parts of steel slag, 400-600 parts of carbide slag or alkaline residues, and 300-400 parts of desulfurized gypsum or phosphogypsum or fluorgypsum. By means of the present invention, the dehydration efficiency of red mud can be improved, the red-mud-based cementing material can also be prepared in one step; the preparation process for the red-mud-based cementing material is simplified; and the prepared red-mud-based cementing material has the advantages of a high mechanical strength, high durability and erosion resistance.

The invention relates to a high-strength stable solid waste-based composite cementing material and a preparation method and application thereof in the field of building materials. The high-strength stable solid waste-based composite cementing material is prepared from the following raw materials in parts by weight: 70-85 parts of composite solid waste micro powder; 10 to 20 parts of Portland cement clinker; 3-8 parts of a composite activator; 0.5 to 2 parts of a nano-scale function regulator; wherein the composite solid waste micro powder is prepared by mixing and grinding the following raw materials in parts by weight: 40-60 parts of blast furnace slag powder; 20 to 30 parts of fly ash; 10-20 parts of chemically modified electrolytic manganese residue powder; and 5-15 parts of steel slag powder. According to the preparation method, sodium metasilicate is adopted to assist medium-temperature calcination to chemically modify the electrolytic manganese residues, so that not only is the gelation activity of the electrolytic manganese residues effectively excited, but also free-state manganese, cadmium and other heavy metal ions in the electrolytic manganese residues are fixed in situ in newly formed zeolite-like silicate mineral lattices through thermochemical reconstruction; and a brand new technical path is opened up for safe and high-value utilization of the typical hazardous waste, namely the electrolytic manganese residues.

The invention discloses a cementing material for a solid waste-based road of a coal-fired power plant and a preparation method of the cementing material. The cementing material mainly comprises a cementing component, an alkali-activated component and a reinforcing component, the gelling component is a mixture of coal-fired power plant fly ash and furnace slag; the alkali-activated component is a mixture of alkali residues, red mud, blast furnace slag and coal-fired power plant desulfurized gypsum; the reinforcing component is rice hull ash or peanut hull ash. The mass ratio of the gelling component to the alkali-activated component is (4 / 1)-(10 / 1); and the addition amount of the reinforcing component is 1-3% of that of the main body material. The coal-fired power plant solid waste fly ash, the furnace slag and the desulfurized gypsum are used as main bodies, a small amount of other industrial solid waste is added, and the cementing material belongs to a full-solid-waste low-carbon cementing material and can be applied to a road base, a subbase or a base layer. The invention has the characteristics of low carbon emission, high solid waste consumption, simple production process and strong pavement performance, and in addition, the invention has a good stabilization effect on the problem that part of solid waste heavy metals and sulfate ions in a coal-fired power plant exceed the standard.

The invention provides an early-strength rapid-repair grouting material and a preparation method thereof, and the early-strength rapid-repair grouting material is mainly prepared from the following raw materials: 50 to 150 parts of sulphoaluminate cement, 10 to 150 parts of aluminate cement, 200 to 350 parts of a regenerated gelling powder material, 1200 to 1400 parts of quartz sand, 50 to 100 parts of silica fume, 10 to 150 parts of mineral powder, 10 to 100 parts of fly ash, 15 to 50 parts of a composite retarder, 0.1 to 2 parts of a water reducing agent and 1 to 10 parts of an early strength agent. 0.01 to 1 part of a water-retaining agent and 200 to 300 parts of water. The early-strength quick-repair grouting material is characterized in that activated low-cementitious active mineral solid waste is adopted as a main cementitious material, and the product has excellent construction stability, low-carbon weather resistance, corrosion resistance, micro-expansion quick-hardening early strength and economical efficiency.

The invention provides low-carbon premixed concrete based on industrial solid waste synergistic activation and a preparation method of the low-carbon premixed concrete. The low-carbon premixed concrete is prepared from the following components: a nano silicon-based anti-corrosion early strength agent, a cementing material, recycled aggregate, electric furnace tailings, waste carbon fibers, a polycarboxylate superplasticizer and water, the preparation method comprises the following steps: S1, preparing a nano silicon-based anti-corrosion early strength agent through silane hydrolysis and modification reaction of nano silicon dioxide; s2, preparing a cementing material: mixing fly ash, steel slag, mineral slag and Portland cement, calcining, grinding, spraying a composite alkali activator, and aging; s3, mixing and forming: wet-mixing the cementing material, the recycled aggregate, the iron tailing sand, the waste fibrilia, the nano silicon-based anti-corrosion early strength agent, the polycarboxylate superplasticizer and water, and pre-injecting and forming; and S4, carbonization curing. According to the invention, efficient utilization of industrial solid waste is realized, and the low-carbon environmental protection performance and mechanical property of the concrete are improved.

The invention relates to the technical field of mine solid waste treatment and carbon dioxide sealing and storage, and particularly discloses a system and a method for sealing and storing carbon dioxide by utilizing coal-based solid waste and mine water to prepare slurry. The system comprises a cement bin, a gangue bin, a coal ash bin, a gasified slag bin, a mine water storage tank, a stirring reaction kettle, a carbon dioxide storage tank, a slurry temporary storage tank, a vacuum pump and a slurry pump, and the stability and adsorption efficiency of carbon dioxide fixation are improved in the mode that coal-based solid waste, mine water and carbon dioxide are subjected to chemical reaction and physical adsorption; meanwhile, the prepared backfill slurry has high-strength anti-pressure ability, the stability of the backfilled underground goaf is better improved, further, coal-based solid waste and mine water are utilized for waste recycling, and the carbon dioxide storage cost is reduced.

The invention discloses a road cementing material based on bulk solid wastes and a preparation method thereof, and belongs to the field of geopolymer cementing materials. The material is prepared from 35-38 parts of fly ash, 15-18 parts of acid-washed red mud, 22-25 parts of carbide slag, 20-23 parts of phosphogypsum, 5-8 parts of rice hull ash, 6-9 parts of a water reducing agent and water, and the water-binder ratio is (0.4-0.5): 1. Wherein the pickling red mud is treated by 5-6% dilute sulphuric acid (pH is 8-9, and heavy metal is reduced by 30%), and the rice hull ash (SiO2 is greater than or equal to 85%) and the nano silicon dioxide (10-30nm) synergistically optimize the microstructure. The 28-day compressive strength of the material is larger than or equal to 35 MPa, the load cycle strength loss rate is smaller than or equal to 5%, the CO2 emission amount is 62 kg / t, the heavy metal leaching concentration is lower than the national standard by 50%, and the cost is only 31.6% of that of traditional cement. According to the invention, efficient synergistic utilization of four solid wastes of fly ash, red mud, carbide slag and ardealite is realized, and the concrete has the characteristics of high strength, low pollution, salt corrosion resistance and the like, is suitable for heavy-duty road base and severe cold area engineering, and has remarkable environmental protection and economic values.

The invention discloses a CO2 inflation foaming preparation method of a ternary solid waste foam cement thermal insulation material, which comprises the following steps: step 1, weighing desulfurized gypsum, fly ash, mineral powder and an additive, and uniformly stirring for later use; step 2, weighing water with required weight, and uniformly stirring the uniformly mixed dry material and water to form uniform slurry; step 3, stirring the uniform slurry at a high speed, and filling CO2 gas while stirring, so as to prepare inflatable foaming slurry; step 4, pouring the inflatable foaming slurry into a mold, weighing a sample, loading the sample into a self-sealing bag, sealing, and curing in a natural environment; and step 5, after curing to the age, taking out the sample, and drying to constant weight to prepare the ternary solid waste foam cement thermal insulation material. The ternary solid waste foamed cement thermal insulation material which takes CO2 as foaming gas, the desulfurized gypsum as a main cementing material and the fly ash and the mineral powder as auxiliary cementing materials is prepared, and meets the A08 grade requirement specified by the standard of foam concrete.

The invention discloses multi-scale toughened full-solid-waste ultrahigh-ductility concrete, which is prepared from the following raw materials in parts by weight: 500 to 650 parts of full-solid-waste cementing materials, 110 to 150 parts of calcined coal gasification slag, 190 to 250 parts of calcined fly ash, 20 to 40 parts of silica fume, 10 to 30 parts of metakaolin, 780 to 930 parts of washed sand, 10 to 25 parts of fly ash fibers, 0.6 to 0.9 part of hydroxypropyl methyl cellulose, 20 to 30 parts of polycarboxylic acid water reducing agents and 300 to 400 parts of water. The calcined coal gasification slag is subjected to gradient heating to 800-960 DEG C, heat preservation is conducted for 30-60 min, then the calcined coal gasification slag is cooled to the room temperature at the cooling rate of 10-15 DEG C / min, and the calcined coal gasification slag is obtained after powder grinding. According to the multi-scale toughened full-solid-waste ultrahigh-ductility concrete provided by the invention, the toughness and the mechanical property of the concrete can be enhanced, the performance of the concrete in an extreme environment is improved, meanwhile, the solid waste utilization rate is increased, and the production cost of the concrete is reduced.

The invention relates to a method for improving early-stage performance of an all-solid-waste cementing material, and aims to improve the early-stage performance of the cementing material. At present, the early strength (1d strength) of an all-solid waste cementing material is generally low, but the characteristic is closely related to construction efficiency and is a key limit for large-scale application of the all-solid waste cementing material. Sintering is not included in the working procedures, and the product does not contain cement clinker. The method comprises the following steps: selecting industrial solid wastes such as steel slag, blast furnace water slag, iron alloy slag, silicomanganese slag, industrial byproduct gypsum, sintering fly ash, fly ash, calcined coal gangue and the like as raw materials; the industrial solid waste is subjected to independent or mixed grinding treatment; by optimizing the raw material ratio and introducing key component minerals, the specific surface area of the cementing material is increased, and active sites of the key minerals are dissociated and exposed. The mass of the introduced key components for optimizing the raw material ratio accounts for less than or equal to 15% of the total mass of the cementing material, the mass fraction of the key and active minerals is increased by less than or equal to 10%, and the early strength of the all-solid waste cementing material is increased by 30%.

The invention provides solid-waste-based cementing material coal gangue vegetation concrete and a preparation method thereof. The solid-waste-based cementing material coal gangue vegetation concrete is prepared from the following raw materials: coal gangue aggregate, a solid-waste-based cementing material, tap water, water glass, KNO3 and polyvinyl alcohol building rubber powder. The coal gangue aggregate is used as a structural framework, the coal gangue powder, the mineral powder and the fly ash are used as cementing materials, and the low-alkali equivalent water glass is used as an alkali component, so that the strength requirement is met, and the pH is reduced. A proper amount of KNO3 and polyvinyl alcohol building rubber powder are doped, so that the workability of the slurry is improved, and meanwhile, the slurry has relatively high water permeability and mechanical property. According to the coal gangue vegetation concrete, solid waste materials can be fully utilized, particularly, coal gangue can be efficiently utilized, and the vegetation performance requirements can be met through a high-porosity different-aperture gradient permeation structure and low alkalinity of the coal gangue vegetation concrete. The method is suitable for greening laying of road slopes, river channel protection slopes, squares and parking lots and mine slopes, the slope surfaces can be reinforced, water and soil loss can be prevented, air can be purified, the ecological environment of a mining area can be repaired, and ecological balance can be maintained.

The invention provides a preparation method of a multi-source coal-based solid waste filling material, and belongs to the technical field of solid waste reutilization, and the preparation method comprises the following steps: uniformly mixing cement, fly ash, furnace bottom slag, desulfurized gypsum, coal gangue, gasified slag and a water reducing agent to obtain a mixed material; and adding fluorine-containing mine water into the mixed material, stirring and mixing to obtain the cemented multi-source coal-based solid waste filling material with predetermined fluidity and bleeding rate. The invention further provides application of the multi-source coal-based solid waste filling material. According to the preparation method and application of the multi-source coal-based solid waste filling material, the coal-based solid waste can be comprehensively recycled and is environmentally friendly, and the prepared multi-source coal-based solid waste filling material can effectively control and treat fluorine ions in mine water.

The invention discloses a composite system geopolymer grouting material and a preparation method thereof. The composite system geopolymer grouting material comprises the following raw materials in percentage by mass: 50-70% of coal gangue, 10-30% of fly ash and 10-30% of cement. Functional additives: 5%-20% of desulfurized gypsum and 5%-15% of bentonite; the composite exciting agent is formed by compounding carbide slag and sodium silicate according to the mass ratio of 1: 1-1: 2. The geopolymer is excellent in mechanical property, meets engineering requirements, is remarkable in environmental protection benefit, conforms to double-carbon target low-carbon process innovation: a calcination-free process: traditional high-temperature calcination is abandoned (the temperature needs to be 550-900 DEG C), carbon emission is reduced by more than 30% (compared with a contrast, the carbon emission of a traditional process is increased by 35%), and the geopolymer conforms to the green positioning of low energy consumption and low three wastes of geopolymers. The cost advantage is prominent, the economic value is remarkable, the raw material cost is reduced, specifically, the coal gangue (low-cost solid waste) is used for replacing 30%-50% of cement, and the comprehensive raw material cost is reduced by 40% (compared with a traditional cement-based grouting material).

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%.

The invention relates to the technical field of cement concrete, in particular to asphalt modified coal gangue cement concrete and a preparation method thereof. In order to solve the problems of high cost and complex process of the existing method for improving the mechanical properties of coal gangue concrete, the invention provides novel asphalt modified coal gangue cement concrete and a preparation method thereof. Comprising the following components in parts by weight: 2 to 5 parts of cement, 0.6 to 1.2 parts of slag, 0.2 to 0.4 part of fly ash, 6 to 7 parts of sand, 10 to 12 parts of coal gangue aggregate, 0.005 to 0.015 part of a water reducing agent, 1.5 to 2.5 parts of water and 2.5 to 3.5 parts of asphalt crude oil. Compared with common coal gangue cement concrete, the modified coal gangue cement concrete prepared by the invention has the advantages that the durability, the strength, the workability, the impermeability and the deformability of the concrete are obviously improved; in addition, the preparation method disclosed by the invention is simple in process, relatively low in cost and easy to implement.

The invention discloses a preparation method of long-age high-crack-resistance low-carbon premixed concrete. The long-age high-crack-resistance low-carbon premixed concrete is prepared from the following components in parts by mass: 370 to 400 parts of cementing material, 32 to 44 parts of crack-resistance composite functional material, 750 to 810 parts of fine aggregate, 1070 to 1120 parts of coarse aggregate, 150 to 160 parts of recycled water and 5 to 10 parts of water reducing agent, the invention is characterized in that the cementing material comprises the following components in parts by mass: 120-220 parts of cement, 100-160 parts of fly ash, 40-70 parts of mineral powder and 20-60 parts of limestone powder; the anti-crack composite functional material comprises the following components in parts by mass: 3-5 parts of a hydration temperature rise inhibiting component, 1-2 parts of a fiber reinforced component, 4-5 parts of an inorganic proliferation waterproof component and 20-36 parts of an expansion component. The early-stage hydration heat of the concrete is effectively reduced and the occurrence time of a temperature peak is delayed through a mineral admixture compound doping technology, a hydration temperature rise adjusting technology, a fiber reinforcing technology, a staged whole-process shrinkage compensation technology, a crack repairing technology and an additive regulating technology; the shrinkage deformation resistance and passive crack repairing capacity of the concrete are enhanced, the crack resistance of the concrete is improved, and the concrete conforms to the green and low-carbon development principle.

The invention relates to the technical field of building materials, in particular to a cementing material for a fabricated wall prepared from multi-element solid waste and a preparation method of the cementing material. The preparation method comprises the following steps: 25-55 parts of fly ash, 25-65 parts of blast furnace slag, 8-10 parts of lime, 1-5 parts of desulfurized 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 the metakaolin to the bentonite to the superfine calcium carbonate in the first mixture is 3: 2: 1; the mass ratio of the vermiculite to the expanded perlite to the glass beads in the second mixture is 2: 2: 1. Through the synergistic excitation effect of Ca < 2 + > and Na < + > and the addition of the first mixture and the second mixture, the cementing material forms a more stable microstructure. A hydration product SEM figure shows that C-S-H and C (N)-A-S-H gel are symbiotic to form a three-dimensional network, pores are filled with needle-like ettringite crystals, and in combination with the brucite phase anchoring effect, the mechanical properties, such as strength and durability, of the material are remarkably improved.

The invention discloses a rotational flow anti-blocking device for a pneumatic coal ash conveying pipeline, and particularly relates to the technical field of pneumatic ash conveying, the rotational flow anti-blocking device comprises a conveying pipeline main body mounted on an inlet and an outlet of a pneumatic powder suction pump, and an anti-blocking device is arranged on the inner wall of the conveying pipeline main body and comprises a square pipe; the anti-blocking device is arranged in the conveying pipeline body, the drying mechanism is used for drying wet fly ash to reduce viscosity and reduce caking, the vibration mechanism is matched with airflow of the drying mechanism to achieve pipeline vibration to clean attached fly ash, and the crushing and filtering mechanism crushes and filters residual caking. The protection mechanism blocks the square pipe when crushing is not needed so as to guarantee stability of the mechanism, the multiple mechanisms act synergistically, the blocking problem in the wet coal ash conveying process is effectively avoided, the conveying efficiency and the system stability are remarkably improved, the equipment shutdown and maintenance cost is reduced, and the service life of the device is prolonged.

The invention provides an environment-friendly sludge curing stabilizer and a preparation method thereof, and the environment-friendly sludge curing stabilizer comprises the following components in parts by weight: 10-25 parts of modified aggregate; 60-70 parts of a cementing agent; 5-30 parts of a water absorbent; the modified aggregate is formed by mixing silica fume and steel slag particles, the cementing agent is composed of slag, fly ash and bentonite, and the water absorbing material is composed of semi-hydrated phosphogypsum, quick lime and red mud; the curing stabilizer is composed of modified aggregate, a cementing agent and a water absorbing material. The environment-friendly sludge curing stabilizer prepared by the invention is used for treating sludge, the water content in 3d is reduced by 80% or more, and the compressive strength exceeds 3MPa; the water content within 14 days is reduced by 90% or above, the compressive strength can reach 6 MPa or above, the compressive strength exceeds the strength grade requirement of a roadbed material, meanwhile, the leaching concentration of heavy metal in the sludge is reduced by 95% or above, the sludge can be used as a building material for resource utilization, and the method has important significance on resource utilization, land occupation reduction and environmental pollution reduction. Wide popularization and application prospects are realized.

The invention discloses low-carbon red-mud-based alkali-activated foam concrete and a preparation method thereof, and belongs to the field of low-carbon foam concrete. Specifically, the mix proportion and the preparation method of the low-carbon red-mud-based alkali-activated foam concrete are as follows: P.O42.5 ordinary Portland cement provided by building materials in Qingdao Weidong macro, the I-grade fly ash is S95-grade granulated blast-furnace slag produced by Henan Province Platinon Casting Material Co., Ltd., and Jinshu New Material Co., Ltd., the I-grade fly ash is S95-grade granulated blast-furnace slag produced by Henan Province Platinon Casting Material Co., Ltd. The Bayer process red mud powder is produced by Hebei Province Shihozhuangfei Mine Product Co., Ltd. The exciting agent is selected from an industrial liquid sodium silicate solution produced by Henan Jinmoistening New Material Co., Ltd. And solid sodium hydroxide particles with AR analytical purity of 96%; the admixture is selected from a TR-26C type polycarboxylate superplasticizer produced by Henan Fuhua Information Science and Technology Co., Ltd. And the foaming agent is a TR-E type animal protein foaming agent produced by Henan Zhuichun Information Science and Technology Co., Ltd. Compared with existing foam concrete, the low-carbon alkali-activated foam concrete provided by the invention uses a large amount of industrial solid waste, reduces the use cost, reduces the use amount of cement under the condition of ensuring the compressive strength, and is simple and convenient to operate, reasonable in process, low-carbon, environment-friendly, rapid in cement setting and hardening, and suitable for large-scale use.

The invention relates to the field of building materials, and discloses a high-strength low-carbon cementing material regulated and controlled by a pH value and a preparation method and application thereof, the cementing material contains a main agent and an auxiliary agent, and the mass ratio of the main agent to the auxiliary agent is 100: 0.03-0.3; on the basis of the total mass of the main agent, the main agent comprises 60-80 wt% of an active component, 5-25 wt% of gypsum and 1-15 wt% of an exciting agent; the active component contains S95-grade mineral powder and a component A; the component A is selected from at least one of secondary steel slag powder, phosphorus slag powder, slag, secondary fly ash, metakaolin and silica fume; the exciting agent is selected from at least two of sintering process red mud, sulphoaluminate cement, salty mud, carbide slag, papermaking white mud and boric sludge, the exciting agent comprises the sintering process red mud, and the sintering process red mud accounts for 30-60 wt% of the total mass of the exciting agent; the pH value of the cementing material is 12.6-13.2 under the condition that the mass ratio of the cementing material to the water is 1: 10. The cementing material provided by the invention has the advantages of low production cost, no harm, moderate alkalinity and excellent mechanical strength.

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.

The invention belongs to the technical field of concrete, and particularly relates to high-water-permeability recycled concrete. The concrete is prepared from 170 to 190 parts of water, 300 to 320 parts of cement, 90 to 120 parts of fly ash, 80 to 120 parts of silica fume, 90 to 110 parts of rice hull ash, 580 to 620 parts of medium sand, 430 to 470 parts of recycled fine aggregate, 1000 to 1100 parts of recycled coarse aggregate, 70 to 100 parts of ceramsite, 6 to 8 parts of a water reducing agent, 2 to 4 parts of an air entraining agent, 1 to 3 parts of a retarder, 110 to 130 parts of fly ash hollow microspheres, 70 to 90 parts of steel slag powder, 30 to 40 parts of silica sol, 20 to 30 parts of cellulosic fibers and 40 to 50 parts of an alkaline activator. 50-60 parts of an organic porous waste material; the composite material has abundant pore structures, strong water permeability, moderate strength, high resource utilization rate, outstanding environmental protection property and the like, improves the utilization rate of rainwater resources, and promotes continuous improvement of ecological environment.

The invention discloses an all-solid-waste cementing material stabilized macadam base mixture which is prepared from the following raw materials in parts by weight: 4-6 parts of an all-solid-waste cementing material, 0-6 parts of wet-discharged fly ash, 0-20 parts of silicon-manganese slag, 10-20 parts of steel slag, 52-65 parts of macadam and 4-6 parts of water. The moisture content of the wet discharged fly ash is 8-12%. According to the all-solid waste cementing material stabilized macadam base mixture provided by the invention, the characteristics of low heat, micro-expansion and relatively high water demand of the all-solid waste cementing material can be utilized, agglomeration of wet-discharged fly ash is reduced, and the uniformity of the water stabilized base mixture is improved, so that the hydration heat is reduced, the risk of quick setting and shrinkage cracking is reduced, meanwhile, the solid waste utilization rate is increased, and the production cost is reduced. And the production cost and the carbon emission are reduced.

The invention discloses a preparation method of low-cost solid-waste-based sulphoaluminate cement, and relates to the technical field of cement preparation.The preparation method comprises the steps of solid waste pretreatment, ingredient design, raw material preparation, low-temperature calcination, clinker quenching and cement powdering.By means of the scheme design, high-aluminum / sulfur-rich solid waste such as red mud, desulfurized gypsum and fly ash is used for replacing 70% or above of natural raw materials, and the low-cost solid-waste-based sulphoaluminate cement is obtained; for example, expensive alumina, natural gypsum and the like, the cost of the raw materials can be directly reduced by more than 40%. Wherein the red mud is used as the waste residue of the aluminum oxide industry, the original treatment cost is very high, and the red mud is converted into an effective aluminum source nowadays, so that negative-cost raw material utilization is realized, and the waste residue treatment cost is also saved; the desulfurized gypsum is used as a power plant waste material to completely replace natural gypsum, so that the sulfur source cost is reduced by 60%. Through comprehensive calculation, the production cost of the clinker is reduced by 30-35% compared with that of the traditional sulphoaluminate cement.

The invention relates to the technical field of concrete, and particularly discloses a process for preparing high-performance concrete from artificial aggregate, which comprises the following steps: mixing sintered steel slag aggregate with the particle size of 5-20mm and regenerated fly ash ceramsite according to the mass ratio of 3: 1, carrying out infiltration treatment by using a silane coupling agent solution with the mass concentration of 8%, and drying in a vacuum environment at 60 DEG C until the water content is less than or equal to 0.5%; the preparation method comprises the following steps: mixing 42.5 R ordinary Portland cement, S95-grade superfine slag powder and silica fume according to a mass ratio of 6: 3: 1, and doping a polycarboxylate superplasticizer accounting for 0.8-1.2% of the mass of the cement and a graphene oxide nanosheet accounting for 0.05% of the mass of the cement; adding the pretreated artificial aggregate, the cementing material and the graded quartz sand into a planetary mixer according to the mass ratio of 1: 0.35: 0.6, adding the ice crumb phase change material modified water in three times, and controlling the discharge temperature of the freshly mixed concrete to be 5-8 DEG C; through the temperature control characteristic of the ice crumb phase change material and the multi-scale structural design of the artificial aggregate, the compactness of an interface transition area is enhanced, and microcrack initiation and propagation in freezing and thawing circulation are inhibited.

The invention discloses a composite mineral admixture prepared from heat-stewed steel slag and a preparation method of the composite mineral admixture, and the mineral admixture is prepared from the following raw materials in parts by weight: 40-50 parts of heat-stewed steel slag powder, 20-30 parts of granulated blast furnace slag powder, 20-40 parts of fly ash, 0.01-0.1 part of a grinding aid and 0.5-4.0 parts of an exciting agent, wherein the grinding aid comprises glycerol and diethanol isopropanolamine, and the exciting agent comprises diphenyl phosphate, sodium sulfate and ammonium bicarbonate. The preparation method comprises the following steps: mixing calcium bicarbonate and water, spraying the mixture on high-temperature steel slag at 600-800 DEG C, carrying out hot braising under the condition of steam pressure of 0.2-0.5 MPa for 8-12 hours to pulverize the steel slag until the particle size is less than 5-10 mm, and carrying out vertical milling on the pulverized steel slag and a grinding aid for 20-40 minutes to obtain hot-braised steel slag powder; uniformly mixing the heat-stewed steel slag powder, granulated blast-furnace slag powder, fly ash, a grinding aid and an exciting agent in proportion to obtain mixed powder; and finally, grinding the mixed powder for 30-50 minutes by adopting a high-energy planetary ball mill to obtain the cement concrete composite mineral admixture with the specific surface area being greater than or equal to 600m < 2 > / kg. According to the invention, the potential hazard of poor stability of a cement concrete material caused by high f-MgO content in the steel slag is broken through, the steel slag is efficiently utilized to prepare a low-carbon green building material, a composite mineral admixture is developed, and the performance meets the II type requirement in JG / T 486-2015 Composite Admixture for Concrete.

The invention discloses a preparation method for curing loess through cooperation of fly ash and magnesium oxysulfate cement, and relates to the field of civil engineering materials. The raw materials comprise fly ash, loess, light calcined magnesia, magnesium sulfate heptahydrate and water. During preparation, the raw materials are mixed and stirred to form a solidified loess mixture, and the solidified loess sample is obtained after mold forming, demolding and natural curing. Wherein the fly ash is solid waste generated by high-temperature combustion of a coal-fired power plant. By optimizing and improving the formula of the magnesium oxysulfate cement in the prior art and adding the coal ash with the optimal proportion, the mechanical property and durability such as water resistance and freeze-thaw resistance of the solidified soil are effectively improved, meanwhile, resource utilization of the coal ash is achieved, and the requirement for green and environment-friendly development is met.

The utility model discloses a high-quality fly ash efficient winnowing device which comprises a winnowing box, an air inlet is formed in one end of the winnowing box, two sets of angle-adjustable baffles are arranged in an inner cavity of the winnowing box in the air inlet direction, each set of baffles is movably connected with a set of first collecting pieces, and the heights of the two sets of baffles are gradually increased. The angle-adjustable baffle can be flexibly matched with pulverized coal with different sources and different particle distributions, particles with different particle sizes can be effectively separated by adjusting the angle of the baffle when the particle size distribution of the pulverized coal particles changes, the winnowing efficiency is greatly improved, and the winnowing efficiency is improved. By accurately controlling the angle of the baffle, the winnowing process can be more stable, it is guaranteed that the quality of collected fly ash is uniform, the production requirement of high-quality fly ash is met, and meanwhile the adaptability of the winnowing device to different wind forces is enhanced.