447 results about "Metakaolin" patented technology

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 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 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 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.

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 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 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 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 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 application discloses a polymer repair mortar for marine concrete and a preparation method thereof. The polymer repair mortar comprises dry powder mortar and a composite modified polymer. The dry powder mortar comprises 525 cement, an expanding agent, high-activity metakaolin, sand, a water reducing agent, a defoaming agent, latex powder and modified polypropylene fibers. The composite modified polymer comprises water-based epoxy resin, graphene, sodium hydroxymethyl cellulose and amide modified hydrogenated castor oil. The dry powder mortar and the composite modified polymer are mixed uniformly to obtain the polymer repair mortar. The polymer repair mortar improves the impermeability and impact resistance of the repaired marine concrete. The composite modified polymer can form a dense waterproof protective film on the surface of the mortar, effectively reducing the influence of the dry-wet cycle of the sea, chloride ion corrosion and the impact of sea waves. In addition, the adhesion between the repair mortar and the marine concrete matrix is further improved.

The invention belongs to the technical field of building material and solid waste resource utilization, and relates to a high-durability and high-toughness slag powder-steel slag powder quaternary synergistic excitation-reinforcing agent and a preparation method of gel system mortar. The quaternary synergistic excitation-reinforcing agent comprises the following raw materials in parts by mass: 4-16 parts of sodium hydroxide, 79 parts of sodium silicate, 4-16 parts of aluminum sulfate and 60 parts of metakaolin, and the sum of the mass parts of the sodium hydroxide and the aluminum sulfate is 20. According to the quaternary synergistic excitation-reinforcing agent, sodium hydroxide and sodium silicate are used as main excitants, and aluminum sulfate serving as a function regulator and metakaolin serving as a high-activity aluminum-silicon source and a micro aggregate are introduced to serve as synergistic reinforcing components; the four components cooperate to jointly form an excitation-reinforcement composite system with high durability and high toughness; the sulfate erosion resistance, the chloride ion penetration resistance, the carbonization resistance, the toughness and the impact resistance of the slag powder-steel slag powder cementing system mortar are improved.

The invention discloses a geopolymer-based recycled fine aggregate shield synchronous grouting material and a preparation method thereof. The grouting material is composed of a cementing material, an alkali activator, aggregate, a water reducing agent, a retarder and water, and the cementing material is a geopolymer precursor and is composed of fly ash, slag and metakaolin; the aggregate is composed of river sand and recycled fine aggregate. By optimizing the proportion and the preparation process, the material has the characteristics of excellent flowability, controllable setting time, high early strength, good impermeability, good durability and the like, and is suitable for synchronous grouting of shield tunnels in water-rich sand layers, high-water-pressure stratums or corrosion stratums. The invention also provides two optimization methods which are respectively based on a response surface method and a BP neural network combined genetic algorithm to realize multi-objective optimization of slurry performance. According to the material, dependence on traditional cement and gravel resources is remarkably reduced, energy consumption and carbon emission are reduced, high-added-value resource utilization of industrial solid waste and construction waste is achieved, and the material conforms to the development direction of green low-carbon building materials.

The invention discloses an anti-cracking calcium silicate board and a preparation method thereof, and relates to the technical field of light building materials. The method comprises the following steps: carrying out ball milling, acid pickling and silane coupling agent surface modification on quartz sand to obtain alkylated quartz sand; and carrying out dry mixing on the mixture, metakaolin, silica fume and cement. The linen fiber is subjected to alkali treatment and hydroxyethyl acrylate graft modification, and the PVA fiber is subjected to silane coupling agent and nano silicon dioxide coating treatment. Dispersing graphene oxide, carboxylated styrene-butadiene emulsion and other assistants in water, adding the dry mixture, uniformly stirring, and then adding the two modified fibers to prepare mixed slurry; and finally, carrying out pressure forming, pre-curing, high-pressure steam curing and drying to obtain a finished product. Through substrate silanization, fiber grafting / nanocrystalline seed modification and synergistic introduction of graphene oxide and elastic emulsion, the interface bonding strength and toughness are remarkably enhanced, crack initiation and propagation are effectively inhibited, and the plate has excellent cracking resistance.

The invention relates to the technical field of building lime materials, and particularly discloses a lime material doped with aerated concrete waste and a preparation method of the lime material. The invention relates to a lime material doped with aerated concrete waste. The lime material is prepared from the following raw materials: quick lime, composite regenerated powder, metakaolin, a lithium-based composite activator, modified nano-zinc oxide, semi-hydrated gypsum, hydroxypropyl methyl cellulose ether and sodium carboxymethyl starch, the composite regenerated powder is obtained by activating aerated concrete waste and waste clay brick powder through an acetic acid solution and composite alkali liquor; the modified nano-zinc oxide is obtained by modifying nano-zinc oxide with a silane coupling agent and trehalose. The lime material provided by the invention can effectively digest and utilize the aerated concrete waste and the waste clay brick powder; in addition, through collaborative innovation of a composite additive system, the coagulation strength and water resistance of the lime material are effectively improved.

The invention discloses a heavy metal curing baking-free brick based on copper mine tailings and a preparation method thereof, and belongs to the technical field of solid waste resource utilization, the heavy metal curing baking-free brick comprises the following raw materials by weight: 2-3 parts of lime, 7-9 parts of slag, 6-11 parts of cement, 65-75 parts of copper mine tailings, 0.5-1.5 parts of nano silica, and 3-5 parts of modified metakaolin. According to the method, the copper mine tailings can be effectively treated, heavy metal elements in the tailings can be solidified, environmental pollution and resource waste can be reduced, the baking-free bricks with good performance can be prepared, the using requirements of the fields such as buildings are met, remarkable economic and environmental benefits are achieved, and a feasible and effective way is provided for comprehensive utilization of the copper mine tailings. In addition, the preparation method provided by the invention is simple and convenient to popularize and apply.

The invention relates to the technical field of acid-activated cementing materials, and particularly discloses an acid-activated metakaolin-ferrotitanium tailing-based lead ion fixing and sealing geopolymer material and a preparation method thereof in order to solve the problems that an existing acid-activated geopolymer material is poor in stability and reduced in mechanical property. The geopolymer material is prepared from the following components in parts by mass: 20 to 35 parts of ferrotitanium tailings, 30 to 45 parts of metakaolin, 5 to 10 parts of nano silicon dioxide, 15 to 25 parts of phosphoric acid composite exciting agent and 0.5 to 2.5 parts of solid sealing auxiliary agent, the phosphoric acid composite exciting agent comprises phosphoric acid and ammonium dihydrogen phosphate, and the sealing auxiliary agent comprises modified attapulgite and sodium polyacrylate. Through compounding of multiple components, multiple synergistic effects of physical encapsulation, ion exchange, chemical bonding and interface adsorption enhancement are realized, the lead ion encapsulation efficiency and mechanical properties are improved, the maintenance energy consumption is reduced, and the problems of insufficient long-term stability, low low-temperature curing efficiency and the like of the existing acid-activated geopolymer material can be effectively solved.

The invention discloses an anti-cracking phosphoric acid-based geopolymer, an anti-cracking recycled aggregate as well as a preparation method and application of the anti-cracking phosphoric acid-based geopolymer and the anti-cracking recycled aggregate. The method comprises the following steps: by taking a phosphoric acid solution with the mass concentration of 50-60% as a phosphoric acid excitation solution, firstly, adding metakaolin into the phosphoric acid excitation solution, and mixing, so that the aluminum-silicon structure of the metakaolin is fully deconstructed by phosphoric acid; the preparation method comprises the following steps: adding the phosphoric acid into a reaction system, adding fly ash, mixing to enable the phosphorus-aluminum ratio in the reaction system to be 1.2-1.4, magnetically stirring at 70-80 DEG C until the slurry is changed from red brown to gray, and generating an inorganic polymer network mainly comprising P-O-Al and P-O-Si bonds, namely the anti-cracking phosphoric acid-based geopolymer slurry. The modified recycled aggregate prepared by adopting the phosphoric acid-based geopolymer slurry in combination with three-stage maintenance not only has improved cracking resistance, but also has better mechanical properties. The performance of the prepared modified recycled aggregate is close to that of natural aggregate, and the modified recycled aggregate can be applied to asphalt concrete or asphalt pavements.

The invention discloses road and bridge anti-heavy load concrete and a preparation method thereof, relates to the technical field of concrete technology, and belongs to the patent classification number C04B28 / 00. The preparation method of the concrete comprises the following steps: firstly, impregnating and activating polypropylene fibers with a potassium permanganate acid solution, then treating with aminopropyltriethoxysilane to obtain interface modified fibers, preparing a suspension from the interface modified fibers, mixing with a premixed solution of nano silicon dioxide containing a water-borne epoxy resin emulsion, and reacting to obtain a fiber reinforced composite material; the preparation method comprises the following steps: mixing metakaolin and silica fume, adding waterborne polyurethane and carboxylated multi-walled carbon nanotubes, carrying out high-speed shearing, carrying out spray drying to obtain interface reinforced microspheres, carrying out dry mixing on cement, machine-made sand, granite gravel, mineral powder and a fiber reinforced material, adding a polycarboxylic acid water reducer solution, carrying out high-speed stirring, adding the microspheres, and carrying out medium-speed stirring to obtain the concrete. The concrete prepared by the invention has excellent mechanical strength, so that the heavy load resistance is realized.

The present application relates to a kind of sea sand chloride solidifying agent and its application method, the solidifying agent includes solidifying agent A and solidifying agent B;The solidifying agent A is proportioned according to the raw material of weight parts as follows: modified hydrotalcite 2~5 parts, ultrafine silica powder 0.05~0.2 parts, water 30~120 parts;The solidifying agent B is proportioned according to the raw material of weight parts as follows: metakaolin 1~4 parts, calcium hydroxide 0.1~0.3 parts, water 45~180 parts.The present application is attached to the surface of sea sand by modified hydrotalcite with ion adsorption effect and forms inner solid layer, can effectively absorb the chloride ion released by sea sand;While using calcium hydroxide to excite metakaolin with sheet shape and form stable outer solid layer, can effectively prevent the shedding of inner solid layer material;The generated hydrated calcium silicate and hydrated calcium aluminate gel can also absorb the chloride ion solidified from the escape of inner solid layer, further improve the chloride ion solidification effect.

The invention relates to the technical field of building materials, in particular to an energy-saving and environment-friendly recycled concrete pipe pile and a preparation method thereof. The recycled concrete is prepared from the following raw materials in parts by weight: 35 to 45 parts of recycled aggregate, 22 to 28 parts of P.O42.5 Portland cement, 6 to 9 parts of magnesium phosphate cement composite admixture, 18 to 22 parts of river sand, 1.0 to 1.3 parts of hydroxylated graphene-chitosan-nano zinc oxide ternary composite modifier, 6 to 8 parts of modified waste tire rubber powder, 0.5 to 0.8 part of basalt fiber and the like. The rubber powder is soaked in a sodium hydroxide solution and then treated with a maleic anhydride grafted polyethylene solution; the metakaolin is prepared by calcining coal gangue; the ternary modifier is prepared by grafting, crosslinking and dispersing; the magnesium phosphate admixture contains light calcined magnesia, ammonium dihydrogen phosphate and borax. The tubular pile is excellent in mechanical and durable performance and high in solid waste utilization rate, carbon emission and production energy consumption are reduced, the cost is reduced, the problems that a traditional regenerated tubular pile is low in strength and poor in environmental protection performance are solved, the tubular pile is suitable for multiple engineering scenes, and economic and environmental benefits are remarkable.

The invention discloses a chitin-silicon-calcium-based modified material for rammed earth wall repair and a weather resistance evaluation method thereof, and belongs to the technical field of rammed earth wall repair, the chitin-silicon-calcium-based modified material comprises metakaolin, calcium oxide, quartz and chitin; the ratio of chitin to metakaolin to calcium oxide to quartz is 1: 1: 2: 4; the method comprises the following steps: pre-treating at the earlier stage of a test, evaluating freeze-thaw cycle performance, evaluating dry-wet cycle performance, evaluating salt corrosion resistance, analyzing association between a microstructure and a strength performance, and finally, revealing a material degradation rule and mechanism by combining scanning electron microscope observation, unconfined compressive strength test and crack rate analysis. When the freezing and thawing cycle number N is less than or equal to 5, the dry and wet cycle number I is less than or equal to 9, and the salt solution concentration c is less than or equal to 0.3 mol / L, the characteristics of freezing and thawing resistance, dry and wet resistance, salt erosion resistance and the like of the modified material are obviously improved; after the modified material is added, internal pores of plain soil can be filled, unconfined compressive strength of a soil body is enhanced, and long-term durability of the soil body is improved.

This invention provides a soil stabilizer and its construction method, belonging to the field of road construction. The soil stabilizer comprises a water-reducing and densifying powder, a hydration-resistant stabilizing liquid agent, and a cementing material. By mass fraction, the water-reducing and densifying powder comprises 20-30% zeolite powder, 5-8% aluminum sulfate, 3-7% lithium carbonate, 2-4% silica fume, and the balance metakaolin. By mass fraction, the hydration-resistant stabilizing liquid agent comprises 5-8% polyamide resin, 3-5% alkyltrimethylammonium chloride, 2-4% organosilane coupling agent, 1-2% sodium lignosulfonate, and the balance liquid polyethylene glycol. The stabilizer of this invention consists of three main functional modules: the water-reducing and densifying powder, the hydration-resistant stabilizing liquid agent, and the cementing material. These components work synergistically to achieve efficient stabilization of silty soil.

The application provides a geopolymer zinc-rich anticorrosive coating and a preparation method and use method thereof. The geopolymer zinc-rich anticorrosive coating comprises slag, metakaolin, water glass, zinc powder, a filler and an additive. The application solves the problem of poor mechanical properties caused by excessive zinc powder content. The problem of poor protection of the coating caused by excessive zinc powder content can be effectively avoided by high-temperature (450-500 DEG C) baking of the geopolymer zinc-rich anticorrosive coating. The molten zinc powder can completely fill the pores between the coating and the zinc powder and form a dense passivation film. Compared with the traditional zinc-rich coating, the high-temperature baked zinc-rich anticorrosive coating has higher hardness, wear resistance, corrosion resistance and heat resistance.

The present application relates to the technical field of chemical activation material, and discloses a composition for chemical activation silico-aluminate self-sensing material, a self-sensing material, a preparation method and application thereof.The composition contains a main agent and an auxiliary agent;the main agent is a first component, aggregate, a second component and a chemical activation agent;45-60wt% of slag, 5-35wt% of metakaolin and 5-20wt% of silica fume are contained in the first component based on the total weight of the first component;the second component is carbon black and steel fiber;and the specific surface area of the carbon black is 50-70m 2 / g, and the average particle size is 40-50nm.The chemical activation silico-aluminate self-sensing material obtained by using the composition for chemical activation silico-aluminate self-sensing material has high strength and toughness, high sensitivity, low carbon and low cost, and has excellent application prospect in the field of building materials and engineering.

The present application relates to the technical field of building materials, in particular to a thermodynamic modified material for grotto rock mass fissure grouting and a preparation method thereof, which comprises the following components in a mass ratio: lime-based material 100-200 parts; quartz sand 30-50 parts; metakaolin 30-70 parts; calcium aluminate expansive agent 10-20 parts.The present application has the advantages of optimized thermal conductivity, controlled thermal expansion coefficient, improved microstructure and comprehensive performance.The thermal conductivity of the lime-based grouting material is higher than that of traditional tung oil materials, reducing thermal stress concentration caused by temperature gradient;the thermal expansion coefficient can be changed from negative to positive by adjusting the water-cement ratio and the amount of expansive agent, and tends to be close to the limestone rock mass, reducing the risk of interface peeling;the optimized material has higher crystallinity and denser structure, reducing microfissures and improving heat conduction efficiency;while maintaining high mechanical strength and durability, the material realizes directional modification of thermodynamic properties, providing technical support for long-term preservation of grottoes.