448results about How to "Improve early strength" patented technology

The invention discloses a normal-temperature rapid early-strength high-performance asphalt cold-patch material and a preparation method thereof, and the asphalt cold-patch material comprises the following substances in percentage by mass: 80-86 wt% of aggregate, 7.5-11 wt% of mineral powder, 0.5-1 wt% of cement, 0.5-1 wt% of slaked lime, 0.2-0.4 wt% of bentonite, 0.2-0.4 wt% of lignin fiber and 5-7 wt% of asphalt cold-patch liquid, d40 dearomatization solvent naphtha or a mixture of D40 dearomatization solvent naphtha and D60 dearomatization solvent naphtha is used as a diluent in the asphalt cold supplementing liquid. The method comprises the following steps: preparing asphalt cold supplementing liquid; drying the aggregate, the mineral powder, the cement, the slaked lime and the bentonite; putting the aggregate, the cement, the slaked lime, the bentonite and the lignin fiber into a mixing pot and stirring; adding the asphalt cold supplementing liquid into the mixing pot and stirring; and adding the mineral powder into the mixing pot, and stirring to obtain the rapid early-strength high-performance asphalt cold patch material at normal temperature. The asphalt cold-patch material disclosed by the invention can quickly form strength within an extremely short time, ensures quick passage after pit slot repair, and maximally reduces the influence of traffic transportation.

The invention relates to low-carbon high-durability concrete in the field of concrete. The low-carbon high-durability concrete comprises the following components in parts by weight: 30-35 parts of cement, 40-46 parts of a cementing material, 180-190 parts of coarse aggregate, 150-160 parts of fine aggregate, 4-6 parts of an air entraining and water reducing agent and 60-70 parts of water, the cementing material comprises the following components in percentage by weight: 50-55% of granulated blast-furnace slag, 5-10% of steel slag, 3-5% of desulfurized gypsum, 1-3% of tailings, 2-4% of desulfurized fly ash, 2-4% of red mud, 3-5% of a reinforcing agent and the balance of silicon hydrochloric acid cement clinker. The method has the effect of improving the durability and strength of the low-carbon concrete.

The invention provides a composite exciting agent and application thereof, and relates to the technical field of exciting agents, and the composite exciting agent comprises an alkaline exciting agent, a calcium source exciting agent and an auxiliary exciting component. Industrial solid waste materials such as the slag, the fly ash and the steel slag can work cooperatively in the same system, the gelling performance, the mechanical strength and the durability of the material are remarkably improved, and the purposes of solid waste resource utilization and low-carbon environmental protection are achieved.

The invention relates to the technical field of concrete preparation, in particular to fiber-reinforced building solid waste recycled aggregate concrete and a preparation method thereof.The preparation method comprises the following preparation steps that S1, recycled coarse aggregate, slag, fly ash and river sand are mixed and stirred according to the proportion, and a cement mixture is obtained; s2, calcining the cement mixture for 2-3 hours to obtain cement clinker; s3, cement clinker, modified fibers, modified graphene oxide and tetrasodium iminodisuccinate are mixed according to the proportion and then poured into a stirrer to be stirred for 5-6 min; and S4, adding water into the stirrer according to the proportion, continuously stirring for 6-10 minutes, and taking out to obtain the fiber-reinforced building solid waste recycled aggregate concrete. According to the invention, the polystyrene fiber and the concrete are connected more tightly by using the modified fiber, and the polystyrene fiber can be subjected to multiple reactions with components in the concrete in an alkaline environment of the concrete to form a stable network structure, so that mechanical indexes such as crack resistance and breaking strength of the concrete are improved.

The invention discloses early-strength nano C-S-H crystal nucleus concrete in a low-temperature curing environment and a preparation method thereof. The concrete is composed of the following substances in parts by weight: 260-300 parts of PO52.5 ordinary Portland cement; 135 to 155 parts of slag; 60 to 70 parts of fly ash; the water-binder ratio is 0.27 to 0.31; the sand ratio is 0.40 to 0.44; the water reducing agent accounts for 1% of the mass of the gel body; the nano C-S-H crystal nucleus accounts for 6%-10% of the mass of the gel body; 1080 to 1210 parts of coarse aggregate; and 770 to 870 parts of fine aggregate. The method comprises the following steps: (1) respectively weighing the cement, the slag and the fly ash according to the parts by weight, putting into a stirrer, and stirring for 1 minute; 2) continuously adding sand and stone into the concrete mixer, and continuously stirring for about 2 minutes; and 3) adding the water, the water reducing agent and the nano C-S-H crystal nucleus into the mixture, and uniformly stirring for 2 minutes. The method effectively solves the problem of slow development of concrete strength in a low-temperature environment, also solves the problems of long construction period and high maintenance cost of a concrete structure in winter, and has obvious engineering significance and relatively strong economic benefits.

The invention discloses geopolymer regenerated fireproof mortar based on porous light filler and a preparation method of the geopolymer regenerated fireproof mortar. The fireproof mortar is prepared from the following raw materials: 460 to 520 parts of cementing material, 210 to 360 parts of porous light filler, 330 to 380 parts of alkali activator, 120 to 500 parts of regenerated fine aggregate and 180 to 280 parts of water, the porous light filler is preferably selected from fly ash hollow microspheres. The preparation method comprises the following steps: uniformly mixing the cementing material, the porous light filler and the recycled fine aggregate to obtain a dry mixture; and adding an alkali activator into the dry mixture to obtain the geopolymer regenerated fireproof mortar. And after the age is reached, demolding and curing are carried out. By utilizing the characteristics of high porosity, low heat conductivity coefficient and the like of the porous light filler, the heat preservation and heat insulation capabilities of the geopolymer regenerated mortar are improved, the fireproof performance of the geopolymer mortar is greatly improved, and meanwhile, the resource utilization of solid wastes is realized.

The invention discloses a charcoal-based alkali-activated resistance and control material as well as a preparation method and application thereof. The biochar-based alkali-activated resistance and control material comprises the following components in percentage by mass: 50-70% of in-situ soil and 30-50% of a colloidal material, wherein the colloidal material is an ash body material and a composite alkali activator, and the composite alkali activator is obtained by ball-milling active magnesium oxide and charcoal; the biochar-based alkali-activated resistance and control material has better early compressive strength under the condition of low gel-sand ratio, and the 7d compressive strength can reach 9.33 MPa; meanwhile, the existence of the charcoal can better adsorb and intercept soil pollutants, the anti-seepage performance is better, and the permeability coefficient can reach 2.4 * 10 <-10 > m / s; when applied to rapid prevention and control of emergency pollution sites, the composite material can be rapidly laid and formed, the pollutant seepage concentration is lower, and the composite material has great application prospects.

The invention discloses a weak cemented rock-soil mass cultural relic reinforcement grouting material and a preparation method and application thereof, and relates to the field of building earthen site repair and reinforcement. The grouting material comprises the following components in parts by weight: 50 to 150 parts of water, 31 to 71 parts of Portland cement, 10 to 30 parts of aluminoferrite cement, 19 to 39 parts of a composite filling agent, 2 to 7 parts of a micro-expanding agent, 0.5 to 1.5 parts of an anti-underwater dispersing agent and 0.3 to 0.5 part of a water reducing agent. According to the material, the matching property of the grouting material and the weakly cemented rock and earth mass cultural relics can be improved; the risk that the rock-soil body ruins are possibly damaged by the self load of the grouting material is reduced; the physical and mechanical properties are improved.

The invention discloses a cold patch asphalt mixture based on dearomatization solvent oil and a preparation method thereof, the cold patch asphalt mixture comprises the following substances in percentage by mass: 89-91 wt% of aggregate, 2-3 wt% of mineral powder, 2-3 wt% of cement, 0.4-0.6 wt% of bentonite and 4-6 wt% of asphalt cold patch liquid, and D60 dearomatization solvent oil is used as a diluent in the asphalt cold patch liquid. The preparation method comprises the following steps: preparing asphalt cold supplementing liquid, and preserving heat for later use; drying the aggregate, the mineral powder, the cement and the bentonite, and preserving heat for later use; the mixing pot is heated, and the aggregate, the cement and the bentonite are put into the mixing pot to be stirred; adding the asphalt cold supplementing liquid into the mixing pot for stirring; and adding the mineral powder into the mixing pot, and stirring to obtain the cold patch asphalt mixture based on the dearomatization solvent oil. The cold patch asphalt mixture prepared by the invention has excellent comprehensive performance, perfectly meets the performance requirement of a hot mix asphalt mixture, can quickly form strength, can quickly open traffic after repairing pits and slots, and has small influence on road traffic.

The invention provides a nano modified composite cementing material, which relates to the technical field of cementing materials, and comprises the following components: slag, construction waste powder, a nano material, an alkali activator and water. By introducing the nano material, the pore structure of the solid waste-based material is remarkably improved, and the gelling capacity, mechanical property and durability of the solid waste-based material are improved. Meanwhile, the material also has relatively strong crack resistance, and the photocatalytic performance and the self-cleaning function of the material can be improved by introducing a functional nano material.

The invention discloses a solid waste-based cold-mixed asphalt mixture for preventive maintenance as well as a preparation method and application thereof, and belongs to the technical field of road engineering. The solid waste-based cold-mixed asphalt mixture is prepared from the following components in percentage by mass: 4.7 to 8.6 percent of modified cold-mixed asphalt adhesive, 85.8 to 93.9 percent of aggregate and 1.4 to 5.6 percent of composite filler, the modified cold-mixed asphalt adhesive is prepared from the following components in parts by weight: 86 to 96 parts of emulsified asphalt, 1 to 5 parts of bisphenol A type waterborne epoxy resin emulsion, 0.05 to 1 part of curing agent, 0.01 to 0.05 part of defoaming agent, 1.5 to 8 parts of waterborne polyurethane emulsion and 1 to 3 parts of hydroxypropyl methyl cellulose. The solid-waste-based cold-mixed asphalt mixture prepared by the method shows excellent comprehensive performance in high-temperature rut resistance, water damage resistance, freeze-thaw resistance, skid resistance, volume stability, interlayer shear resistance and the like, promotes reasonable utilization of solid waste resources, and has good economic and environmental benefits.

The invention relates to the technical field of building construction materials, in particular to low-carbon high-performance concrete and a preparation method thereof. The low-carbon high-performance concrete is prepared from the following preparation raw materials in parts by mass: 150 to 180 parts of Portland cement, 24 to 27 parts of sulphoaluminate cement, 120 to 150 parts of activated coal gangue powder, 60 to 80 parts of fly ash, 600 to 700 parts of gravel, 60 to 65 parts of modified basalt fiber, 20 to 25 parts of limestone powder, 10 to 12 parts of light calcined magnesia, 2 to 3 parts of accelerant, 7 to 10 parts of modified polycarboxylate superplasticizer and 180 to 220 parts of water. According to the low-carbon high-performance concrete disclosed by the invention, excellent mechanical properties and durability are ensured, the environmental protection targets of low cost and low carbon emission are achieved, and a new solution is provided for sustainable development of concrete materials.

The invention relates to the technical field of cement-based pavement patching materials, and particularly discloses an aluminoferrite cement-based concrete pavement patching material as well as a preparation method and application thereof. The repairing material is prepared from the following raw material components in parts by weight: 25 to 45 parts of iron aluminate cement clinker, 2 to 5 parts of Portland cement clinker, 5 to 15 parts of composite gypsum, 2 to 4 parts of calcium sulphosilicate, 2 to 4 parts of vaterite, 10 to 25 parts of mineral powder, 40 to 50 parts of fine aggregate, 0.05 to 0.25 part of triisopropanolamine or diethanolisopropanolamine, 0.75 to 1.5 parts of calcium formate and 0.5 to 1.0 part of sulfate. The strength of the repairing material can be improved in the whole age, the freeze-thaw resistance is improved, and the repairing material has good bonding strength with the pavement.

The invention provides a flow-state solidified soil modifier and a preparation method thereof, and belongs to the technical field of modifiers. The adhesive is prepared from the following raw materials in parts by weight: 20-40 parts of a modified glue solution, 4-7 parts of an active material, 15-25 parts of a micro-expansion material, 1-2 parts of an exciting agent and 2-4 parts of an auxiliary agent. Soil solidified by the fluid solidified soil modifier has good mechanical strength, small mixing amount, low cost, convenience in construction, high early strength and later stable strength of the soil, good water retention and water resistance, small strength change after the soil encounters water, and the active material has good stability, low cost and high enzyme loading capacity, so that the fluid solidified soil modifier has good application prospects. The method improves the catalytic ability of the enzyme, is safe and non-toxic, is low in later maintenance cost, can be repeatedly used, has heavy metal pollution repair ability, can degrade heavy metals and reduce the use amount of chemical degradation elements, and has wide application prospects.

The invention belongs to the technical field of geotechnical engineering, and particularly relates to a nanocarbon reinforced superfine cement-based blocking material as well as a preparation method and application thereof. The superfine cement-based blocking material prepared by the invention is prepared by uniformly mixing 45-50 parts of cement, 0.5-2.5 parts of a solid waste sintered active material, 0-0.05 part of a water reducing agent, 0.015-0.1 part of carbon nanotubes, 0.5-2.5 parts of a 1% solution of carbon quantum dots and 45-50 parts of water. The material has relatively low porosity and is not dispersed; the high groutability is achieved, and the material can permeate into tiny holes; and it is guaranteed that the material has high strength, the crushed rock bonding and reinforcing strength is high, and the material has wide application prospects.

The invention relates to the technical field of concrete admixtures, and discloses a nano rebound inhibitor for shotcrete and a preparation method thereof. The components, measured by weight, include 400-600 parts of nano microspheres, 400-550 parts of nano calcium carbonate, 10-30 parts of sodium carbonate, 1-10 parts of sodium aluminate, 10-30 parts of alum, 18-40 parts of polycarboxylic acid water reducer, and 0-0.5 parts of triterpenoid saponin; the nano microspheres are hydrated calcium silicate with silicon dioxide as the core material and colloid as the shell material, and the colloid is doped with a lithium source. The nano rebound inhibitor of the present application can significantly improve the state of shotcrete and greatly reduce the rebound amount of concrete, thereby further saving construction costs and accelerating construction accuracy. By utilizing the characteristics of the mineral admixture in the nano rebound inhibitor, the compactness of the concrete can be improved, and the durability of the shotcrete can be further improved.

The invention discloses a low-temperature early-strength cement slurry system based on a cellulose-based composite phase change material, and belongs to the field of oil and gas field well cementation. The preparation method of the composite phase change material comprises the following steps: adding pretreated waste paper fibers, a cross-linking agent and a heat conduction material into an alkali / urea solution, and putting the mixture into an ultrasonic cleaning instrument to obtain a mixture A; transferring to a dialysis bag, and soaking in deionized water to obtain a mixture B; and performing in-situ mixing on the mixture C and organic phase change material molecules to obtain a mixture C, and performing vacuum freeze drying. The low-temperature early-strength cement slurry system is prepared from the following components in parts by weight: 100 parts of cement, 0.3-1 part of a composite phase change material, 5-25 parts of a density reducing material, 0.1-0.8 part of an early strength agent, 0.2-1 part of a dispersing agent, 0.2-2 parts of a fluid loss agent, 0.01-0.5 part of a defoaming agent and 44-58 parts of water. While cement hydration heat release is regulated and controlled, the early compressive strength of the cement can be improved, and the operation time efficiency and the construction safety are improved.

The invention relates to a synchronous grouting material based on muddy silt shield muck and a preparation method thereof, and the synchronous grouting material comprises the following raw materials in parts by weight: 13 to 16 parts of cement, 16 to 20 parts of slag, 142 to 147 parts of fine sand containing silt powder, 0.03 to 0.1 part of trimethylsilyl ethyl acetate, 0.07 to 0.17 part of disodium hydroxyethylphosphonate, 0.03 to 0.1 part of pentasodium amino trimethylene phosphonate and 63 to 67 parts of water. According to the invention, the fine sand containing mud powder is used as a main raw material to replace bentonite and fine sand in synchronous grouting in the prior art, and is combined with a specific cement additive, so that the compressive strength and the impermeability of the synchronous grouting material are effectively improved through the synergistic effect of the components, local materials can be used, and the outward transportation and disposal cost of a large amount of muck can be greatly reduced.

The invention discloses a shield segment prefabrication method and a production line, and relates to the technical field of shield segment prefabrication production. The shield segment prefabrication method comprises the steps that concrete is poured into a shield segment prefabrication mold; in the length direction of the prefabricated shield segment mold, a plurality of sequentially-arranged temperature monitoring intervals are obtained through marking, and the multiple temperature monitoring intervals jointly cover concrete; the concrete and the prefabricated shield segment mold are put into a steam curing kiln; steam curing is conducted on the concrete, and temperature information of the concrete corresponding to the temperature monitoring intervals is obtained through the temperature monitoring intervals; adjusting steam curing parameters of the steam curing kiln according to the temperature information; and film covering maintenance is conducted, and prefabrication of the shield segment is completed. According to the shield segment prefabricating technology, a whole set of systematic shield segment prefabricating technology is formed from concrete pouring, temperature monitoring, steam curing and later film covering curing, the prefabricating process of the shield segment is optimized, and the quality of the prefabricated shield segment is improved.

The invention discloses a geopolymer loess curing agent formula based on multi-element bulk solid waste and a preparation method thereof, and relates to the technical field of bulk solid waste geopolymer loess curing agents, the geopolymer loess curing agent formula comprises the following components: 50-70 parts of a curing material component, 10-30 parts of a reinforcing component, and 5-25 parts of an excitation component; the curing material component is fly ash, and the particle size of the curing material component is smaller than 300 microns; the reinforcing component is rice hull ash (the main component is SiO2); the single-component geopolymer curing agent is prepared by taking the rice hull ash and bulk solid waste as main raw materials, the use amount of solid waste exceeds 80%, on one hand, various solid waste can be effectively treated through the method, and on the other hand, the use amount of the solid waste is reduced; on the one hand, the solid waste can be converted into a product with a high additional value, full utilization of resources is achieved, on the other hand, the stacking cost of the solid waste can be reduced, the negative influence of the solid waste on the environment is reduced, and meanwhile a large number of resources are saved.

The invention relates to the technical field of airport pavement slab construction, and particularly discloses a construction method for repairing an airport pavement slab without joint cutting, which comprises seven steps of dismounting an original pavement slab, arranging ribs, embedding a joint-cutting-free partition plate, pouring, pulling and pouring joints, galling and grooving, and checking repairing quality. And because the maintenance time required by the concrete is too long, the airport has to stop the air to repair the pavement slab.

The invention relates to the technical field of slag cement-based materials, and particularly discloses an early-strength low-carbon slag cement-based material as well as a preparation method and application thereof. The cement-based material comprises the following components in parts by weight: 60-80 parts of slag powder, 15-30 parts of gypsum powder, 3-10 parts of cement, 1-5 parts of a hydration accelerator and mixing water. The hydration accelerant is prepared from hydroxyl copper iodate and aluminum dihydrogen phosphate according to the mass ratio of (0.08-0.13): 1. The ratio of the mixing water to the total mass of the slag, the gypsum and the cement is (0.4-0.6): 1. According to the low-carbon slag cement disclosed by the invention, the hydration accelerator consisting of the hydroxyl copper iodate and the aluminum dihydrogen phosphate effectively promotes the early hydration degree of the low-carbon slag cement, so that the early strength is improved, and meanwhile, the middle and later strength of the cement cannot be obviously reduced.

The invention discloses a marine concrete underwater engineering geopolymer repairing material. The repairing material is prepared from the following raw materials in parts by weight: 10-15 parts of a composite alkali activator, 30-40 parts of granulated blast furnace slag powder, 20-25 parts of fly ash, 10-15 parts of cement, 1-2 parts of silica fume, 1-2 parts of wollastonite, 0.1-0.3 part of a flocculating agent, 0.2-0.5 part of a water reducing agent, 2-5 parts of an expanding agent, 0.1-0.3 part of a thickening time control agent, 3-5 parts of latex powder and 5-10 parts of water. The marine concrete underwater engineering geopolymer repairing material has the characteristics of self-leveling, self-compacting, vibration-free, high early strength, good dispersion resistance, strong binding power with an original cement concrete base material, capability of realizing self-falling construction in water and moderate price, and can better meet the performance requirements of underwater repairing of marine concrete structures.

The invention belongs to the technical field of solid waste resource utilization, and discloses a belite-aluminate mineral additive and a preparation method and application thereof.The belite-aluminate mineral additive is prepared from, by mass, 25-40 parts of alumina tailing slag, 60-65 parts of carbide slag, 1-8 parts of coal gangue, 0.1-0.5 part of CaF2, 2-8 parts of fluorgypsum and 0.1-0.5 part of borax. The prepared belite-aluminate mineral additive mainly comprises monocalcium aluminate, dodecacalcium heptaaluminate, dicalcium silicate and tetracalcium aluminoferrite, when Portland cement is modified with the doping amount of about 10%, the setting time of the cement can be effectively shortened, the early strength can be improved, the performance is excellent, low-temperature calcination is achieved, and energy is saved.

The present invention discloses a method for solidifying dredged sludge by using biological carbonization activated magnesium oxide technology, and belongs to the technical field of soil solidification. In the present invention, urease-producing bacteria are first used to prepare a pre-hydrolyzed urea solution, and then the pre-hydrolyzed urea solution and an activated magnesium oxide solidifying agent are separately and evenly mixed into dredged sludge with a certain water content according to a certain dosage, stirred to form a slurry, and the slurry is filled in a designated site or model and fully maintained. The present invention greatly reduces the construction cost and improves the feasibility and efficiency of solidification treatment of dredged sludge with high water content by introducing the technology of carbonization of urea solution pre-hydrolyzed by urease-producing microorganisms and activated magnesium oxide solidifying agent.

The invention discloses a springback inhibitor for sprayed concrete as well as a preparation method and application of the springback inhibitor. The rebound inhibitor is prepared from the following components in percentage by mass: 2-5% of magnesium aluminum silicate, 19.8-29.8% of silica fume, 1-4% of a macromolecular tackifier, 2-5% of aluminum sulfate slag powder, 38-51% of superfine stone powder, 9-16% of fly ash microspheres, 1-2% of a water reducing agent, 2-3% of redispersible milk powder, 2-5% of inorganic mineral fibers and 0.01-0.2% of modified plant fibers. The springback inhibitor disclosed by the invention has a remarkable effect on reducing the springback rate of the sprayed concrete, and can enhance the water dispersibility resistance of the sprayed concrete and improve the cohesiveness of the sprayed concrete. The preparation method disclosed by the invention is simple in industry and easy for large-scale production.

The invention discloses coal gasification slag-based self-foaming lightweight concrete and a preparation method thereof, and relates to the field of comprehensive utilization of lightweight foam concrete and solid wastes. The coal gasification slag-based self-foaming lightweight concrete is prepared from the following components in parts by weight: 50 to 60 parts of coal gasification fine slag, 20 to 30 parts of waste incineration bottom ash, 10 to 30 parts of composite admixture, 5 to 20 parts of composite exciting agent, 20 to 40 parts of fine aggregate, 40 to 60 parts of water, 0.3 to 0.5 part of sodium lactate, 0.3 to 0.5 part of water reducing agent, 0.3 to 0.7 part of cellulose ether and 0.3 to 0.5 part of redispersible latex powder. The invention has the advantages of low manufacturing cost, small environmental pollution, simple process flow, multiple curing modes and excellent performance in various aspects, can replace the traditional foam concrete, can effectively reduce the use of cement-based cementing materials, and promotes the recycling and large-scale utilization of solid waste materials.

The invention belongs to the technical field of resource utilization of engineering residue soil, and particularly discloses an adjustable backfill material based on low-viscosity fine-grained soil and a preparation method of the adjustable backfill material. The adjustable backfill material comprises the following components in percentage by mass: 65-85% of low-viscosity engineering waste soil, 5-10% of a high-strength curing material system, 0-1% of a fluidity promoting material system, 0-1.5% of a compactness reinforcing material system and 5-25% of water, wherein the sum of the percentages of the components is 100%. According to the backfill material, low-viscosity fine-grained soil serves as base soil, three different material systems including a high-strength curing material system, a fluidity promoting material system and a compactness enhancing material system are doped, and cured soil with the properties of high fluidization, self-compaction, controllable strength, low permeability and the like is obtained; the raw materials of the backfill material are simple and easy to obtain, the process is simple and convenient, different engineering requirements can be met by regulating and controlling the proportion of different material systems, and the problems that the muck containing area is insufficient and the disposal cost is high can be effectively solved.

The invention relates to a preparation method of a C-S-H seed crystal type super early strength agent as well as a product and application of the C-S-H seed crystal type super early strength agent, and belongs to the technical field of production of cement-based materials. According to the preparation method, the C-S-H seed crystal type super early strength agent is obtained by mainly utilizing a microwave irradiation principle and taking a siliceous raw material, a calcium raw material, a dispersing agent, an organic complexing exciting agent and water as raw materials to react. The preparation method provided by the invention is short in reaction time, and the synthesized C-S-H seed crystal type super early strength agent has the characteristics of good early strength effect, good stability, greenness and harmlessness, can be widely applied to various product concrete and cast-in-place concrete projects, and has wide research background and important significance in the field of synthesis of composite materials such as concrete admixtures.

The invention provides a composite mineral admixture based on iron ore tailing mud and a preparation method thereof, and the composite mineral admixture comprises the following raw materials by weight: 30-40 parts of activated iron ore tailing mud, 5-10 parts of layered ultrafine powder, 5-10 parts of a methacrylic acid-cellulose copolymer, 5-7 parts of limestone powder, 1-3 parts of a composite grinding aid, and 1-3 parts of a composite activator. According to the composite mineral admixture disclosed by the invention, the mixing amount of the composite mineral admixture in cement can be increased to the maximum extent, the use amount of cement clinker is reduced, the production cost of the cement is reduced, the composite cement has more excellent mechanical properties, volume stability and durability, and the composite mineral admixture plays a role similar to a crystal nucleus effect in a cement hydration process; and meanwhile, the hydration products tend to be uniformly distributed in the whole interface transition area, the hydration products with better stability are generated, and the anti-permeability performance is improved.