596 results about "Metakaolin" patented technology

The invention relates to the technical field of filling materials, and particularly discloses an ardealite-based high-strength anti-seepage filling material and a preparation process thereof, the ardealite-based high-strength anti-seepage filling material comprises 50%-65% of pretreated ardealite, 15%-25% of Portland cement, 5%-15% of superfine slag powder, 5%-10% of electrolytic manganese residues, 5%-8% of silica fume, 3%-6% of metakaolin, 2%-4% of a composite alkali activator and 0.5%-1.2% of a polycarboxylic acid water reducer, 0.3%-0.8% of an organic silicon water repellent and 0.05%-0.1% of cellulose ether; according to the invention, through chemical reaction of Mn < 2 + > in the electrolytic manganese residue and SO4 < 2-> in the phosphogypsum, micron-sized manganite crystals (MnAl2 (SO4) 4. 22H2O) are generated to actively fill internal micro-cracks of the material, so that a filling body is endowed with a self-repairing function and the impermeability is improved, and a composite alkali activator composed of NaOH and water glass is used for synergistically activating potential gelling activity of the superfine slag powder and the silica fume, so that the self-repairing filling material is prepared. And the formation of hydration products is accelerated, and 0.3-0.5 T of pulsed magnetic field is applied in the stirring process, so that the manganite crystals are guided to orderly grow along the expected stress direction of the filling body, and the compressive strength is improved.

The invention belongs to the field of modified self-repairing calcium aluminate cement 3D printing, and particularly relates to a phosphate modified self-repairing calcium aluminate cement 3D printing material and a preparation method thereof. The phosphate modified self-repairing calcium aluminate cement 3D printing material prepared by the invention is prepared from the following raw materials in parts by mass: 60 to 70 parts of calcium aluminate cement, 3 to 7 parts of silica fume, 2 to 4 parts of metakaolin, 0.5 to 3.5 parts of double-template modified calcium bentonite, 0.8 to 1.5 parts of amino modified sodium polyphosphate and 0.15 to 0.8 part of basalt fiber. The invention relates to a concrete anti-microbial agent, which is prepared from the following raw materials in parts by weight: 20-30 parts of water, 20-30 parts of water, 20-30 parts of water, 20-30 parts of nano calcium carbonate, 20-30 parts of nano calcium carbonate, 20-30 parts of magnesium phosphate cement coated bacteria-loaded porous microspheres, 20-30 parts of a polycarboxylate superplasticizer, 20-30 parts of an organic silicon defoaming agent and 25-35 parts of mixing water. The technical-economic cooperation requirement of building 3D printing under complex working conditions is met, and various indexes of phosphate modified calcium aluminate cement applied to the 3D printing technology are met.

The invention discloses high-strength concrete and a preparation method thereof in the field of concrete. The high-strength concrete is prepared from the following raw materials in parts by weight: superfine sulphoaluminate cement; coarse aggregate; quartz sand; silica fume; coal ash; nano metakaolin; silicon carbide whiskers; a graphene oxide; a pH responsive microcapsule; coating the steel fibers with liquid metal; a carbon nanotube; and a polycarboxylic acid water reducer. Release of the repairing agent is accurately regulated and controlled by adopting the pH response microcapsule, the interface performance is enhanced by combining with the liquid metal coating steel fiber, and the composite dispersion process of the nano material is optimized. Wherein the environment response efficiency of the microcapsule is remarkably improved through the collaborative design of a calcium oxide-slow release agent system and a methyl methacrylate / acrylic acid copolymerization shell layer; according to the gallium-based liquid metal coating, metallurgical bonding of fibers and a matrix is achieved through the low-melting-point characteristic, and traditional physical bonding limitation is broken through.

The invention relates to hybrid fiber reinforced ultrahigh-performance geopolymer concrete as well as a preparation method and application thereof. Slag, metakaolin and silica fume are used as precursor materials of geopolymer concrete, a sodium hydroxide-water glass solution is adopted to compound an alkali activator, and steel fibers, polyvinyl alcohol fibers and modified glass chopped fibers of different sizes are mixed and doped, so that the brittleness of the geopolymer concrete is remarkably improved, and the service life of the geopolymer concrete is prolonged. The early strength and the high temperature resistance are improved. The hybrid fiber reinforced ultrahigh-performance geopolymer concrete has the characteristics of low carbon emission, ultrahigh strength, high temperature resistance, high durability and the like, and can meet the use of the geopolymer concrete in actual engineering. According to the ultrahigh-performance geopolymer concrete, solid waste resources are utilized at the same time, carbon emission in the concrete production process is reduced, and the ultrahigh-performance geopolymer concrete is environmentally friendly, low in carbon, ultrahigh in strength, easy to prepare and capable of being suitable for complex environmental engineering structures such as tunnels, bridges and high-rise buildings.

The invention discloses high-performance fluid-state solidified soil for backfill based on composite ardealite of building residue soil, which is prepared by taking the building residue soil as a core raw material, taking a compound of a polycarboxylic acid water reducer and hydroxypropyl methyl cellulose as a fluidization regulator, and mixing the fluidization regulator and the building residue soil to prepare the high-performance fluid-state solidified soil for backfill. Superfine slag powder, fly ash, nano silicon dioxide, metakaolin and ardealite are used as curing agents, so that the fluid-state solidified soil with strong performance is obtained. Through the synergistic effect of all the components and innovative processes such as liquid nitrogen low-temperature grinding, nano material compounding and a segmented vacuum stirring process, the effect that the ultrahigh strength of the construction waste soil reaches 7.5 MPa within 14 days is achieved for the first time and is improved by 40% or above compared with that of conventional solidified soil, and the industrial problem that traditional waste soil is insufficient in solidification strength is solved; and collaborative optimization of strength and fluidity is realized. Meanwhile, efficient resource utilization of the construction waste is achieved, land occupation and environmental pollution caused by muck landfill are greatly reduced, and the requirement for green and sustainable development is met.

The invention relates to the technical field of building materials, and particularly discloses a slag and ardealite synergetic activated gypsum batten and a preparation method thereof.The slag and ardealite synergetic activated gypsum batten comprises pretreated ardealite, superfine slag powder, a composite exciting agent, reinforced fibers, self-repairing microcapsules, a foaming agent and water, and the composite exciting agent is formed by compounding nano SiO2, CaO and metakaolin; the preparation method comprises the following steps: mixing nano silica sol and a lignin solution, performing spray drying, and performing heat treatment to obtain the self-repairing microcapsule; the preparation method comprises the following steps: carrying out dry mixing on pretreated phosphogypsum, superfine slag powder and a composite exciting agent, adding water, adding reinforced fibers, self-repairing microcapsules and a foaming agent, stirring to form slurry, carrying out injection molding on the slurry, and carrying out stepped maintenance of pre-maintenance, main maintenance and carbonization treatment to prepare the modified red mud-pretreated phosphogypsum-based self-repairing self-repairing composite phosphogypsum-based self-repairing self-repairing composite phosphogypsum-based self-repairing composite phosphogypsum-based self-repairing composite phosphogypsum-based self-repairing composite phosphogypsum. The composite excitant synergistically activates the activity of the slag, and is matched with the reinforced fibers, the self-repairing microcapsules and stepped curing, so that solid waste resource utilization is realized, the compression resistance, bending resistance and impact resistance of the batten are improved, and the environment-friendly and high-performance effects are achieved.

The invention relates to the technical field of concrete waterproofing agents, in particular to a high-efficiency concrete anti-crack waterproofing agent and a preparation method thereof, and the high-efficiency concrete anti-crack waterproofing agent is prepared from the following raw materials in parts by weight: a calcium sulphoaluminate expanding agent; light burning of magnesium oxide; re-burning the magnesium oxide; nano-scale silicon dioxide; metakaolin; polypropylene fibers; basalt fibers; styrene-acrylic emulsion; a silane emulsion; silica fume; hydroxypropyl methyl cellulose; and a polycarboxylic acid water reducer compatilizer. According to the high-efficiency concrete anti-crack waterproof agent disclosed by the invention, the nano-silica, the metakaolin and the styrene-acrylic emulsion synergistically block nano-to-macroscopic multi-stage pores, so that double waterproofing of physical filling and chemical film forming is realized; the polypropylene and the basalt fiber are subjected to ultrasonic dispersion and interface combination optimization to form a three-dimensional anti-crack network, the component uniformity and the functional stability are ensured through precise proportioning, graded mixing and directional granulation, meanwhile, the waterproof agent is compatible with industrial production fluctuation, large-scale application reliability is ensured, and the problems that a traditional waterproof agent is single in function and insufficient in durability are solved.

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 the technical field of mortar, in particular to cement self-leveling anti-crack and anti-seepage mortar and a preparation method thereof. The cement self-leveling anti-cracking and anti-seepage mortar is prepared from the following raw materials in parts by mass: 50 to 70 parts of Portland cement, 70 to 90 parts of quartz sand, 5 to 10 parts of nano metakaolin, 1 to 3 parts of calcium sulfate, 5 to 10 parts of polyethylene fiber, 1 to 2 parts of nonionic surfactant, 1 to 2 parts of silane coupling agent, 3 to 8 parts of composite basalt fiber, 0.5 to 1.5 parts of polycarboxylate superplasticizer and 1 to 3 parts of defoaming agent. 1-3 parts of hydroxypropyl methyl cellulose, 1-2 parts of a retarder and 0.5-1.5 parts of a coagulant. The mortar material has good anti-cracking performance and anti-seepage performance and excellent durability, can effectively solve the problem that the anti-cracking performance and the anti-seepage performance of the mortar material in the prior art cannot meet the environmental requirements, and is suitable for large-scale popularization and application.

The invention discloses a coal gangue-based reinforced cement composite material and a preparation method thereof, and relates to the technical field of building materials. The coal gangue-based reinforced cement composite material is prepared from a coal gangue-based reinforced admixture, calcium ion doped modified multi-walled carbon nanotubes, polypropylene fibers, P.O42.5 Portland cement, metakaolin, silica fume, a polycarboxylate superplasticizer and water, calcium ion doped modified multi-walled carbon nanotubes and a coal gangue based reinforced admixture are cooperatively added into a cement matrix, seamless filling from nanometer to micrometer is achieved, a tough interface transition area is formed, pressure is jointly borne by a compact matrix and a strong interface, the compressive strength and breaking strength of the material are remarkably enhanced, and meanwhile, the compressive strength and breaking strength of the material are greatly improved. Migration of moisture and ions is effectively blocked, and the anti-permeability performance of the material is improved.

The invention discloses steel fiber reinforced metakaolin-based recycled concrete and a preparation method thereof, and belongs to the technical field of civil engineering materials. The concrete is prepared from the following components in percentage by mass: 60wt%-80wt% of recycled aggregate, 20wt%-40wt% of a cementing material, 0.5 wt%-1.4 wt% of steel fibers and 0.1 wt%-0.7 wt% of an additive, wherein the cementing material comprises cement and metakaolin, and the mass ratio of the metakaolin to the cement is (1-3): (7-9). A nano silicon dioxide coating is arranged on the surface of the steel fiber. The preparation method adopts a step-by-step stirring process. The problem that dynamic impact resistance and green low carbon are difficult to cooperate in the prior art is solved, through component optimization and process control, the dynamic compressive strength of the concrete is improved, the energy absorption capacity is improved, the damage mode is converted into ductility from brittleness, fiber distribution is uniform, and the concrete is suitable for impact-resistant projects such as airport runways and protective structures.

The invention provides high chloride ion permeation resistance steel fiber fine aggregate concrete and a preparation method thereof. The high chloride ion permeation resistance steel fiber fine aggregate concrete comprises the following raw materials in parts by weight: 200-300 parts of cement; 30 to 50 parts of metakaolin; 100 to 200 parts of fly ash; 50 to 100 parts of mineral powder; 1-8 parts of nano silicon dioxide; 800 to 1000 parts of sand; 800 to 1000 parts of stone; 10 to 60 parts of steel fiber; 150 to 200 parts of water; and 5-20 parts of a water reducing agent. The steel fiber fine aggregate concrete with high chloride ion permeation resistance has the advantages of improved mechanical properties and durability, extremely high chloride ion permeation resistance, excellent volume stability, low material cost, economic feasibility of large-scale application, and wide application prospect. And the strict service requirements of the urban rail transit ballast bed under the long-term dynamic load, stray current and erosion medium coupling effect are precisely met.

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 sulfate-erosion-resistant metakaolin-slag-based geopolymer concrete, belongs to the technical field of concrete, and aims to solve the problems that the corrosion resistance of traditional silicate concrete is ineffective and the adaptability of conventional alkali-activated concrete is insufficient in a special environment. The concrete comprises the following components in parts by weight: 60-90 parts of a cementing material, 120-170 parts of aggregate, 15-30 parts of a composite activator, 2-8 parts of a function regulator and the like, the cementing material is prepared from nano TiO2 / KH-550 composite modified metakaolin, slag and silica fume-coal gangue powder-HAP composite powder; the aggregate comprises modified limestone macadam (soaked and dried by a sodium dihydrogen phosphate solution) and river sand; the composite exciting agent comprises water glass, sodium hydroxide, sodium pyrophosphate, propylene glycol and the like; the function regulator comprises superfine fly ash, a naphthalene water reducer, HPMC (Hydroxy Propyl Methyl Cellulose) and boric acid. Through the synergistic effect of the components, the sulfate corrosion resistance, the mechanical property and the environmental adaptation performance of the concrete are improved, and the concrete is suitable for engineering construction under the service environment of high-concentration sulfate and the like.

The invention provides anti-erosion hydraulic concrete and a preparation method thereof, and belongs to the technical field of concrete. The concrete comprises the following components: composite cement, high-activity nano-modified metakaolin, blast furnace slag powder, low-calcium fly ash, coarse aggregate, natural river sand fine aggregate, granite machine-made sand fine aggregate, an erosion inhibitor, a functional additive, an early-strength polycarboxylic high-performance water reducer, a composite air entraining agent and the like. The composite cement comprises sulphoaluminate cement, Portland cement and polymer waterproof mortar. The high-activity nano modified metakaolin is obtained by modifying metakaolin with an organic silicon-ZnO composite emulsion and then drying. The erosion inhibitor comprises organic carboxylate, a hydrophobic-crystallization complexing agent and a pH buffer type corrosion inhibitor. The functional auxiliary agent comprises an itaconic acid and acrylic acid copolymer, a JRY-F concrete waterproof agent and polyethylene glycol-400 dilaurate. The composite air entraining agent comprises liquid sodium abietate and sodium alpha-olefin sulfonate. Through component synergism, modification and grading, an anti-erosion barrier is constructed.

The invention relates to the technical field of concrete crack repairing agents, in particular to a triggered precipitation type concrete crack repairing agent as well as a preparation method and application thereof. The repairing agent is prepared from the following raw materials: sulphoaluminate cement, nano anhydrite with a core-shell structure, fluorine-phosphorus composite seed crystal, magnesium oxide, metakaolin and a water reducing agent, wherein the core-shell structure nano anhydrite is prepared by coating mesoporous silica with nano anhydrite, and the fluorine-phosphorus composite seed crystal is prepared from calcium fluoride and monocalcium phosphate through a hydrothermal reaction. According to the trigger precipitation type concrete crack repairing agent prepared by the invention, sulfate ions are slowly released through the core-shell structure nano anhydrite, the crystal form of ettringite is regulated and controlled through the fluorine-phosphorus composite seed crystal, the problems that a traditional repairing agent shrinks and falls off in the later period, the high-temperature strength is suddenly reduced, and the binding power is insufficient are solved, and the trigger precipitation type concrete crack repairing agent is suitable for concrete structure crack repairing and high-temperature environment engineering.

A method of making a silver-silicalite coating on a surface of a stainless-steel substrate is provided. The method includes mixing metakaolin with an aqueous solution of NaOH to form a first mixture. The method further includes mixing silica gel and silver nitrate with the first mixture to form a second mixture. Furthermore, the method includes mixing Zeolites Socony Mobil-5 (ZSM-5) with the second mixture to form a third mixture. The method further includes hydrothermally treating the stainless-steel substrate with the third mixture to form the silver-silicalite coating on the surface of the stainless-steel substrate. The hydrothermal treatment is carried out in the absence of an organic template. The stainless-steel substrate coated with the silver-silicalite coating, prepared by the method of the present disclosure, has lower corrosion in comparison to the same stainless-steel substrate without the silver-silicalite coating.

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 copolymer anticorrosive paint and a preparation method thereof, and relates to the technical field of paints. The invention discloses inorganic copolymer anticorrosive paint. The coating is prepared from the following raw materials in parts by weight: 20 to 30 parts of silica sol, 8 to 15 parts of sodium hydroxide, 30 to 45 parts of metakaolin, 8 to 20 parts of quartz sand, 15 to 25 parts of water, 0.3 to 2 parts of sodium polyacrylate, 0.2 to 3 parts of polydimethylsiloxane emulsion, 5 to 12 parts of modified nano titanium dioxide, 6 to 10 parts of modified epoxy resin, 10 to 25 parts of hydroxyethyl methylacrylate, 5 to 10 parts of zinc phosphate, 3 to 8 parts of aluminum triphosphate and 2 to 6 parts of iron oxide red. The raw materials of the inorganic copolymer anticorrosive paint are scientifically proportioned, and the anticorrosive performance is enhanced through the modified nano titanium dioxide and the epoxy resin. Material uniformity is ensured through step-by-step feeding and ultrasonic dispersion in preparation, and stability is improved through vacuum defoaming and nitrogen protection. The components such as the silica sol and the zinc phosphate have a synergistic effect to form a compact coating, and the coating is high in corrosion resistance, good in constructability and suitable for various scenes.

The invention discloses a moss ecological brick and a preparation method thereof, and relates to the technical field of ecological restoration, the moss ecological brick comprises a moss gametophyte matrix and a brick body, the brick body comprises the following raw materials: a tailing composite material, metakaolin, an acid activator and water, and the tailing composite material comprises phosphate tailings and iron tailings. The phosphate tailings and the iron tailings can provide necessary phosphorus elements, other trace elements and the like for the growth of the moss, and the acid activator in the brick body not only can provide a weak acid environment to facilitate the good growth of the moss, but also can solve the problem of saltpetering of the brick body in the environment; the growth of the moss can effectively relieve sulfate erosion of the acid-activated material, and a good curing environment is provided for the acid-activated concrete brick body. Therefore, in the moss ecological brick provided by the invention, the acid-activated concrete brick body can supplement and promote the growth of moss.

A method of preparation of a foamed concrete, comprising the steps of; providing a cementitious slurry, comprising in wt% relative to the wt of the slurry, 60-70% of a cementitious material, 0.5-5% in

A well-cementing cement stone reinforcing material and the use thereof. The well-cementing cement stone reinforcing material comprises, according to a mass ratio: 30-50 parts of an active spherical α-Al2O3 micropowder, 30-50 parts of spherical fly ash, 5-20 parts of nano metakaolin, 5-10 parts of a hydrophilic rubber powder, and 5-10 parts of hydrophilic carbon fibers. Adding the well-cementing cement stone reinforcing material to a cement slurry of an oil-gas well can promote the generation of a crystal phase having stable high-temperature strength during the hydration process of the cement slurry, thereby improving the high-temperature strength of cement stone; and can solve the problems of a decline in strength and an increase in permeability of the well-cementing cement stone in an ultra-high temperature environment, thereby effectively ensuring the long-term sealing integrity of a wellbore in an ultra-high temperature environment and preventing the annular pressure of an oil-gas well caused by cement ring damage.

The invention discloses an admixture for building formwork concrete, and belongs to the technical field of concrete materials. The admixture for the building formwork concrete, disclosed by the invention, comprises the following components in parts by weight: 65-70 parts of chitosan modified metakaolin; 10 to 15 parts of microencapsulated latex powder; 5 to 10 parts of calcium sulphoaluminate clinker; and 3-5 parts of modified polypropylene chopped fiber. Through reasonable proportioning of the components, the synergistic effect of the different components is brought into full play, and the invention aims to provide the additive for the building formwork concrete, which can significantly improve the thixotropic property, the interface bonding force and the crack resistance of the building formwork concrete and effectively prevent the corrosion of a steel formwork at the same time. The method is suitable for building formwork concrete engineering of a complex grid structure and has remarkable application value.

The invention relates to the technical field of corrosion prevention and rust prevention of building materials, in particular to an inorganic polymer reinforced concrete anticorrosive coating and a preparation method thereof. The inorganic polymer reinforced concrete anticorrosive paint comprises the following components in parts by mass: 60-70 parts of a base material, 8-12 parts of an anti-crack system, 10-15 parts of a modified filler, 5-8 parts of an auxiliary agent and 15-20 parts of a solvent, the base material is selected from alkali-activated metakaolin; the preparation method of the modified filler comprises the following steps: calcining a composite filler at 480-500 DEG C for 1.5-2 hours, cooling, dipping in a 10wt% tannic acid solution for 10-12 hours, filtering, dipping in a modified solution, ultrasonically dispersing for 20-30 minutes, vacuum-drying, crushing and sieving to obtain the modified filler. According to the inorganic polymer reinforced concrete anticorrosive paint and the preparation method, the problems that an anticorrosive coating is large in self-shrinkage rate, prone to cracking and difficult to adapt to a complex environment due to the single function in the prior art are solved.

The invention relates to an early-strength muck-based shield synchronous grouting material as well as a preparation method and application thereof, and belongs to the technical field of waste resource utilization and building materials. The preparation raw materials comprise the following components in parts by mass: 50-65 parts of calcined muck, 50-65 parts of slag, 20-26 parts of carbide slag, 500-650 parts of fine aggregate, 25-33 parts of metakaolin, 400-500 parts of water and 10-15 parts of a water reducing agent. Wherein the preparation raw materials of the calcined muck comprise muck and kaolin in a mass ratio of (4-5): 1. The silica-alumina ratio is adjusted by mixing the muck and the kaolin, the early strength and the later strength of the slurry are improved by adding the carbide slag and the water reducer, meanwhile, the durability of the material is enhanced, and the skeleton supporting effect is provided by adding the fine aggregate, so that the capability of resisting external load and environmental erosion is enhanced; the duct pieces can be effectively supported in shield tunnel construction, and stratum deformation is prevented.

The invention relates to the technical field of concrete, and provides ultra-high performance concrete and a preparation method thereof. The ultra-high performance concrete is prepared from the following raw materials in parts by weight: 70 to 80 parts of Portland cement, 15 to 25 parts of silica fume, 5 to 10 parts of limestone, 2 to 5 parts of metakaolin, 100 to 120 parts of quartz sand, 24 to 42 parts of hydroxylated steel fiber, 6 to 24 parts of carboxylic butadiene-acrylonitrile latex, 2.0 to 3.5 parts of a water reducing agent and 15 to 22 parts of water. Through the technical scheme, the problem of poor chloride ion permeability resistance of the ultra-high performance concrete in the prior art is solved.

The invention discloses a quick-hardening early-strength concrete mineral additive and a preparation method thereof, and belongs to the technical field of building materials. The additive comprises the following components in parts by weight: 50-75 parts of a mineral active material (compounded by silica fume, slag powder and metakaolin), 15-30 parts of a composite activator (sodium silicate, lithium sulfate and triethanolamine synergistically), 5-10 parts of a sustained-release microcapsule (calcium sulphoaluminate coated with nano-silica) and 2-5 parts of an auxiliary thickening agent (compounded by HPMC and a water reducing agent). The preparation method comprises the steps of mineral activation, excitant reaction and mixing of the microcapsule and the thickening agent. After the additive is doped into concrete, the 3h compressive strength is greater than or equal to 15MPa, the initial setting time is less than or equal to 5min, and the additive has low resilience (less than or equal to 13%), high durability (impermeability is greater than or equal to P11) and environmental adaptability (-5 DEG C strength fluctuation ratio is less than or equal to 9%). And compared with the prior art, the cost is reduced by 40%, and the method has remarkable economic and social benefits.

The invention discloses an alkali-reducing protective agent for a reinforced cement-based cementing material for basalt fibers and application of the alkali-reducing protective agent, and belongs to the technical field of building materials. The alkali-reducing protective agent is prepared from the following raw materials in percentage by weight: 20 to 40 weight percent of active silicon dioxide aerogel, 15 to 30 weight percent of metakaolin, 10 to 25 weight percent of lithium slag powder, 5 to 15 weight percent of nano calcium carbonate, 3 to 8 weight percent of redispersible latex powder, 1 to 5 weight percent of water reducing agent and 0.5 to 2 weight percent of retarder. The invention also discloses an application of the alkali-reducing protective agent in a cement cementing material. According to the invention, the alkalinity of a set cement hole solution around the basalt fiber can be efficiently and enduringly reduced, physical and chemical dual protection barriers are formed on the surface of the basalt fiber, the alkali corrosion of the fiber is obviously delayed, and the long-term durability and enhancement efficiency of the basalt fiber are greatly improved.

The invention relates to the technical field of concrete crack repairing, and particularly discloses a quick-hardening concrete crack repairing agent and a preparation method thereof. The invention relates to a quick-hardening concrete crack repairing agent, which is prepared from the following raw materials: 45 to 55 parts of sulphoaluminate cement; 10 to 15 parts of silica fume; 12 to 18 parts of metakaolin; 5-8 parts of a bimetallic composite seed crystal; 10 to 15 parts of double-layer shell nano anhydrite; 2-4 parts of magnesium oxide; 0.5 to 1 part of polypropylene fiber; 0.5 to 0.8 part of a water reducing agent; 15 to 20 parts of water; the bimetallic composite seed crystal is a zirconium and strontium element co-doped composite crystal nucleus; the double-shell nano anhydrite is composed of an inner core nano anhydrite, a middle aluminum sulfate early strength phase and an outer mesoporous SiO2 shell. The quick-hardening concrete crack repairing agent has the advantages of being short in setting time, high in early strength and excellent in interface bonding performance.

The active cooling building component based on the porous geopolymer comprises the following two aspects: 1, the active cooling building component based on the porous geopolymer comprises 0.5%-1.5% of aluminum powder; 50%-70% of metakaolin; 20%-40% of slag; 5%-20% of fly ash; 3%-10% of an alkali activator; 10%-30% of a phase change material; the preparation method of the active cooling building component based on the porous geopolymer comprises the following steps: S1, preparing a porous geopolymer matrix: taking slag, fly ash and metakaolin as main precursor materials, doping a certain amount of aluminum powder, then adding a certain amount of an alkali activator, and curing under the excitation condition of the alkali activator to form the porous geopolymer matrix; s2, phase change material filling, wherein the porous geopolymer matrix is put into a liquid phase change material to be soaked, and a pore structure is filled with the phase change material; s3, geopolymer slurry encapsulation: taking out the porous geopolymer matrix in the step S2, cooling and solidifying, coating the surface with the geopolymer slurry, and solidifying to form a compact geopolymer encapsulation layer; and S4, post-treatment and application. The cable is good in stability, good in leakage resistance, high in strength and good in temperature control function.