90 results about "Calcium silicate hydrate" patented technology

The invention discloses an ettringite / nano hydrated calcium silicate early strength agent as well as a preparation method and application thereof, and belongs to the technical field of concrete admixtures. The early strength agent comprises ettringite and nano calcium silicate hydrate, the ettringite is in a short rod shape and has three sizes, and the size distribution and the percentage of the ettringite accounting for the total mass of the ettringite are as follows: the diameter of the ettringite is 40-50nm, and the percentage of the ettringite is 40-80%; the diameter is 70-90 nm, and the proportion is 10-30%; the diameter is 120-150nm, and the proportion is 10%-30%. The ettringite with a proper size is compounded according to a specific proportion and then is combined with the nano hydrated calcium silicate to form the composite seed crystal, and the composite seed crystal is used as the early strength agent, so that the mechanical property of silicate cement can be remarkably improved.

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.

A method for producing supplementary cementitious material (“SCM”). The method comprises: contacting an input stream with a mechano-thermal activation aid; thermally treating the input stream to form a thermally treated input stream; and cooling the thermally treated input stream and obtaining supplementary cementitious material. The method may further comprise carbonating the thermally treated input stream. The method may further comprise modification of a network structure by the mechano-thermal activation aid. A composition comprising a calcium silicate hydrate bond; a supplementary cementitious material; and a mechano-thermal activation aid. The composition may further comprise a carbonate. The composition may further comprise a biomass.

The invention discloses high-performance fiber-blended seawater and sea sand concrete and a preparation method thereof. The high-performance fiber-blended seawater and sea sand concrete is prepared from the following raw materials: cement, fly ash, silica fume, coarse aggregate, sea sand, seawater, a water reducing agent, polyvinyl alcohol fibers and basalt fibers. Polyvinyl alcohol fibers, basalt fibers and a high-quality mineral admixture are mixed and doped in a seawater and sea sand concrete matrix, a three-dimensional framework is formed in the interior macroscopically, aggregate is effectively wrapped, internal defects of the concrete are reduced, the mechanical property is improved, the bridging effect of the mixed fibers is exerted microscopically, and the anti-cracking performance of the concrete is improved. And silica fume, fly ash and Ca (OH) 2 are subjected to a pozzolanic effect to generate low-alkalinity calcium silicate hydrate gel with high strength and excellent stability, so that the ion curing capacity of the seawater and sea sand concrete is improved, and the compactness and durability of a concrete matrix are improved. The fibers and the mineral admixture have a synergistic effect, so that the internal microstructure and durability of the concrete are enhanced, and the concrete can better adapt to low-temperature, freeze-thaw, corrosion and other complex environments.

The invention relates to the technical field of building construction, and provides a high polymer grouting material-concrete interface molecular model construction method which comprises the following steps: constructing an initial PU model, and performing molecular dynamics simulation and full-atom simulation on the model; performing energy minimization and dynamic balance K by adopting an NVT and NPT ensemble; performing crosslinking simulation on the PU model, performing multiple crosslinking cycles at 300K by modifying chemical bonds and adjusting crosslinking degree, and loosening to a stable state under NPT ensemble; constructing a calcium silicate hydrate model, and performing molecular dynamics simulation by using a CSH-FF force field; and combining the PU model with the calcium silicate hydrate model, and performing energy minimization and dynamic balance to complete model construction. Through a molecular dynamics simulation method, the limitation of a traditional experimental technology is broken through, and scientific theoretical support and practical guidance are provided for design of a high polymer grouting material and enhancement of a concrete structure.

The purpose of the present invention is to provide a concrete that has sufficient strength while reducing the amount of CO2 emission. The present invention pertains to an agent for accelerating production of calcium carbonate having a vaterite-type crystal structure. The accelerating agent contains a compound having a plurality of amino groups, and is used when reacting carbon dioxide with a composition containing 5 mass% or more of calcium silicate hydrate.

The invention provides nano calcium silicate hydrate with adjustable setting time as well as a preparation method and application thereof, and the nano calcium silicate hydrate comprises the following components in parts by weight: 10-40 parts of a calcium source, 0.5-3 parts of a zinc source, 10-30 parts of a silicon source, 5-15 parts of a polycarboxylic acid water reducer, 0.5-2 parts of a stabilizer and 100-400 parts of water. According to the nano calcium silicate hydrate capable of adjusting the setting time, zinc ions are introduced into a system, the setting time of concrete can be adjusted in order according to actual engineering requirements by adjusting the zinc-silicon ratio, higher adaptability is shown, the early strength of a cement-based material can be improved, and the setting time of the concrete can be adjusted according to the actual engineering requirements. The setting time of the concrete is regulated and controlled, and different engineering requirements are met. The product is high in stability, easy to store, suitable for various cement-based materials, easy in raw material obtaining, simple in production process, capable of remarkably reducing the production cost, suitable for large-scale popularization and industrial production, remarkable in environmental benefit and economic value, and has positive significance in promoting sustainable development of the building industry.

The application discloses a mine filling solidified material prepared from domestic waste incineration fly ash and a preparation method thereof, and relates to the technical field of waste recycling and reuse, and comprises the following raw materials in mass fractions: 25-35 parts of filling solidified agent, 18-24 parts of coarse tailings, 12-16 parts of fine tailings, 7-9 parts of deionized water and 0.3-0.6 parts of fly ash modifier. On the basis of fly ash harmless treatment, the performance and strength of the filling slurry are improved by adding the fly ash modifier, so that the fly ash can be effectively applied in mine filling, the fly ash landfill and secondary pollution problems are reduced, and under the complex solubilization effect, more calcium silicate hydrate is formed in the hydration process of the fly ash modifier in the filling solidified agent, and the hydration reaction of the mineral powder and the harmless fly ash is promoted. Through the volcanic ash activity excitation effect of nano silica ash and the micro aggregate filling effect of the floating beads, the compressive strength of the filling body is improved.

The invention discloses a performance improvement mechanism and a preparation method of a modified Aga soil material, a silane coupling agent and hydraulic lime are added into traditional Aga soil (Aga soil, water, elm bark juice and clear oil), and the modified Aga soil material is formed by combining a Tibetan ramming process. The modification principle is as follows: a silane coupling agent is dissolved in water to form a silanol solution, the silanol solution permeates into Aga soil along with ramming after being sprayed, and the hydraulic lime and the Aga soil are subjected to a pozzolanic reaction to generate a gelling product mainly comprising hydrated calcium silicate, so that the bonding and overall mechanical properties among particles of the Aga soil are improved; silanol and hydroxyl groups on the surface of the gelling product are subjected to dehydration condensation to form siloxane covalent bonds and enhance the structural stability; then, the silanol molecules are subjected to cross-linking polymerization, an organosilane polymer hydrophobic membrane is formed on the surfaces of the Aga soil and the gelling product, moisture is effectively blocked, and the water resistance and the impermeability of the Aga soil material are improved. The preparation method disclosed by the invention is simple, convenient, green and environment-friendly, can obviously improve the mechanical and durability of Aga soil, and has a good engineering application prospect.

The invention relates to the technical field of building material preparation, and particularly discloses sludge fluid soil and a preparation process thereof.In a curing agent provided by the invention, cement, fly ash, slag and calcium oxide can be subjected to hydrolysis and hydration reaction with water and soil particles in sludge to generate hydrated calcium silicate to wrap the surface of a soil body, so that the structure of the soil body is compact; calcium oxide can activate potential active components in the slag, secondary reaction with the potential active components is carried out, more gelatinization products are generated, the strength and anti-permeability of the solidified soil are further enhanced, sodium lignin sulfonate can improve the flowability of the fluid solidified soil and improve the construction performance, meanwhile, uniform distribution of the solidifying agent in the soil body is facilitated, and the solidification effect of the solidified soil is improved. The problem of insufficient local strength is avoided; and the modified glass fibers can fill micropores in the sludge fluid soil, so that the structure of the sludge fluid soil is more compact, water permeation is blocked, and the mechanical property and anti-permeability performance of the sludge fluid soil are further improved.

The application provides a fast-hardening early-strength high-pressure and freeze-resistant cement material and a preparation method thereof, belongs to the technical field of cement materials, and the cement material comprises silicate cement clinker, natural anhydrous gypsum, calcined kaolin, calcined quartz powder, a silicon-aluminum-titanium composite mineralized early-strength freeze-resistant agent, a crystal bridge-pore dual functional agent and the like. The silicon-aluminum-titanium composite mineralized early-strength freeze-resistant agent is prepared by sintering, quenching and heat reaction of bauxite, silica fume, titanium dioxide, anhydrous calcium chloride and trisodium citrate, and surface modification by KH-550. The crystal bridge-pore dual functional agent comprises a calcium silicate hydrate crystal bridge agent and a polymer-SiO2 composite elastic pore forming agent. The polymer-SiO2 composite elastic pore forming agent is prepared by shearing emulsification of an oil phase prepared from styrene, butyl acrylate, divinylbenzene and polyglyceryl-10 diisostearate and an aqueous phase prepared from deionized water, sodium dodecyl sulfate and polyethylene glycol allyl methyl ether, ammonium persulfate reaction and tetraethyl orthosilicate reaction.

The invention discloses a porous hydrated calcium silicate material, a dry powder coating prepared from the porous hydrated calcium silicate material and application of the porous hydrated calcium silicate material. The preparation method comprises the following steps: taking tannic acid, carbon nanotubes and hydrated calcium silicate as main raw materials, preparing a porous hydrated calcium silicate material with an active oxygen free radical capturing function through a specific process, and stirring and mixing the porous hydrated calcium silicate material with various conventional dry powder coatings to prepare the building interior wall dry powder coating with the active oxygen free radical capturing function. The prepared building interior wall dry powder coating has good active oxygen free radical capturing capacity, can effectively purify indoor air and remarkably improve the indoor environment quality, and has certain application prospects in the field of building materials.

The present application relates to inorganic cementing material, solid waste resource utilization and soil solidifying material technical field, specifically relates to a kind of preparation method of micro-nano solid waste base soil solidifying agent.It aims at solving the technical problems of single function and insufficient durability in prior art.The present application grinds granulated blast furnace slag and calcium silicate hydrate seed together, to obtain modified slag micro powder;Steel slag and fly ash are ultrafine ground to obtain steel slag-fly ash composite micro powder;Preparation mesoporous nano slag-biochar composite core, after impregnation load sodium metasilicate and nano zero-valent iron, in turn deposit calcium alginate-cystosine intermediate shell layer and silane coupling agent modified nano silicon dioxide and nano waste concrete recycled micro powder composite outer shell layer, to obtain multi-layer coated active particle;Silicon dioxide, sodium sulfate and nano calcium hydroxide are ball milled into composite activator;The above components are compounded with dispersion stabilizer under inert gas protection.

The invention discloses a curing material for fixing water-soluble fluorine in ardealite and a harmless treatment method of the ardealite, and the curing material for fixing the water-soluble fluorine in the ardealite comprises carbide slag, silica fume and water. Water in the curing material can ensure proper humidity of reaction, and water-soluble fluorine is converted into insoluble fluorine and is wrapped by C-S-H (hydrated calcium silicate) gel by utilizing synergistic effect of carbide slag and silica fume through chemical reaction and physical wrapping, so that the water-soluble fluorine in the phosphogypsum can be locked in the phosphogypsum, and the water-soluble fluorine in the phosphogypsum can be cured. The content of water-soluble fluorine in the phosphogypsum is remarkably reduced, long-term stockpiling treatment of the phosphogypsum is facilitated, and the treatment cost is effectively reduced by treating the phosphogypsum with the carbide slag and the silica fume solid waste.

The invention discloses a carbon quantum dot modified hydrated calcium silicate nanocrystalline early strength agent as well as a preparation method and application thereof, and belongs to the technical field of building material admixtures. The carbon quantum dots are adopted as an efficient nucleating agent, and C-S-H crystal nucleuses are directionally induced to grow in the thermodynamic stable direction. Through interaction of surface active functional groups, calcium ions and silicate ions, the nucleation barrier of C-S-H is effectively reduced, directional and dense nucleation is induced, the synthesis period of the seed crystal is shortened, and uniform growth of the C-S-H nano seed crystal can be guaranteed. The carbon quantum dots are combined with the polycarboxylic acid water reducing agent, so that the C-S-H nanocrystal seed with smaller particle size and more concentrated distribution can be prepared. Under the same mixing amount, the C-S-H nano seed crystal early strength agent can provide more effective nucleation sites, so that cement hydration is accelerated to a greater extent, and the early strength effect is improved.

The present invention provides a fly ash-based calcium silicate hydrate, a preparation method, and uses thereof. The preparation method comprises adding fly ash as a silicon source and a calcium-containing compound as a calcium source to water to produce a mixed slurry, then subjecting the mixture to thermal activation and hydrothermal reaction. After the reaction is complete, the liquid-solid separation and drying are performed to produce the fly ash-based calcium silicate hydrate. The present invention utilizes a pre-thermal activation process instead of the traditional alkaline activation process. The entire process does not require the addition of a caustic medium, the product does not require washing, and does not contain potassium or sodium metal ions, resulting in a simple process and low cost. The fly ash-based calcium silicate hydrate product produced by this method has a crystalline tobermorite content of up to 40%, a fibrous porous structure, and possesses the functions of water retention, heavy metal ion adsorption, heat insulation, and sound insulation. Furthermore, the fly ash-based calcium silicate hydrate product has a high content of citric acid-soluble silica and can be widely used in cement, concrete, adsorbents, soil conditioners, thermal insulation materials, sound insulation materials, and other fields.

Cement compositions including ordinary Portland cement, a secondary cementitious material (SCM) including one or more of pozzolan, metakaolin, limestone, or gypsum in an amount of up to approximately 70% of a replacement level of ordinary Portland cement, and between approximately 0.05% by weight of cement (bwoc) and 2% bwoc of aggregates of mesoporous carbon nanoparticles (3DG) carbons. The cement compositions regulate nucleation and time-lapsed growth of calcium silica hydrates during initial hydration. The 3DG carbons include aggregates of mesoporous carbon nanoparticles, which include one or more interconnected bundles of electrically conductive graphene layers. The 3DG carbons include oxygen containing functional groups disposed on one or more of the surfaces of the 3DG carbons or within the 3DG carbons.

The present invention discloses a calcium silicate hydrate-based nano-adsorbent and a preparation method and application thereof. The nano-adsorbent is a composite of modified calcium silicate hydrate nano-particles and a dispersant. The modified calcium silicate hydrate nano-particles include calcium silicate hydrate nano-particles and iron ions, magnesium ions and aluminum ions doped in the calcium silicate hydrate nano-particles. After structural modification, the particle size of the calcium silicate hydrate-based nano-adsorbent is reduced, the specific surface area is greatly increased, and the number of adsorption sites on its surface that can adsorb heavy metals is significantly increased, thereby improving its adsorption efficiency and adsorption capacity for heavy metal ions.

The application relates to the technical field of concrete, in particular to a high-cold-region super-high-performance UHPC (Ultra High Performance Concrete) and a preparation method thereof, which is prepared from the following raw materials in parts by weight: 480-560 parts of aluminate cement, 20-40 parts of an additive, 45-75 parts of a functional additive, 520-580 parts of quartz sand, 70-80 parts of steel fiber, 12-20 parts of polycarboxylate superplasticizer and 100-120 parts of water. In the application, the additive is composed of added powder and pretreated boron mud. After being refined, the particles of the added powder can effectively fill the cement paste. After being activated by a soap nut powder solution, the pretreated boron mud provides active chemical components to generate more stable calcium silicate hydrate gel products. Under the dual action of the added powder and the pretreated boron mud, the overall compactness of the concrete is significantly improved, so that the concrete shows stronger compressive capacity when bearing extremely high load, and the service life of the concrete is prolonged.

The invention discloses a coagulator applied to rapid hardening of a soft foundation road section, and belongs to the technical field of soil hardening treatment.The coagulator applied to rapid hardening of the soft foundation road section comprises, by weight, 40%-50% of solid waste building materials, 10%-20% of activated carbon loaded silicon dioxide, 15%-25% of desulfurized gypsum, 0%-3% of a water reducing agent and the balance cement, the solid waste building material comprises coal gangue, fly ash and blast furnace slag. Activated carbon loaded silicon dioxide is used as a raw material, the gel reaction rate is increased by using the hydrophilic and water-absorbing properties of the activated carbon loaded silicon dioxide, a hydrated calcium silicate gel and ettringite dual-crosslinking system formed through material composite design is improved, and a thin and soft muddy medium is converted into a hardened body with enough bearing capacity within 15-20 minutes at normal temperature; the problems of rapid stability and safe passing in a special construction environment are solved, and the safe, environment-friendly and low-carbon purposes of harmless and resourceful treatment of harmful resources are achieved.

The invention discloses a nano calcium silicate hydrate modified waste graphite negative electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing waste graphite powder, soluble calcium salt, soluble silicate and water for reaction, and then drying to obtain nano calcium silicate hydrate modified waste graphite powder; and calcining the nano calcium silicate hydrate modified waste graphite powder to obtain the nano calcium silicate hydrate modified waste graphite negative electrode material. According to the method, the nano-scale hydrated calcium silicate gel is generated on the surface of the waste graphite in situ to coat the surface of the waste graphite, so that surface defects caused by various aging mechanisms in the long-time use process of the waste graphite can be repaired, and the charge-discharge performance and the cycle performance of the waste graphite are remarkably improved. The process flow is simple, the reaction condition is mild, acid and alkali washing is not needed, and the production cost is reduced.

A composition and process for making calcium silicate hydrate board, which comprises preparing a slurry of a mixture of silicic material, lime material, spherical xonotlite particles, synthetic wollastonite and reinforcing fibres with balanced water; forming the slurry into a board by means of the sheet-forming technologies; steam curing the board and drying.

The invention discloses a wind power grouting material based on a modified nano reinforcing agent and a preparation method of the wind power grouting material. The wind power grouting material comprises cement, fine aggregate, a viscosity reducer, modified nano aluminum oxide, modified nano hydrated calcium silicate, an inorganic expanding agent, an additive, steel fibers and water. Wherein the modified nanometer aluminum oxide is nanometer aluminum oxide modified by a silane coupling agent, and the modified nanometer calcium silicate hydrate is nanometer calcium silicate hydrate modified by polyvinyl alcohol. The preparation method comprises the following steps: firstly, adding the viscosity reducer, the modified nano aluminum oxide and the modified nano calcium silicate hydrate into water, and stirring to form slurry; mixing and stirring the cement, the fine aggregate, the inorganic expanding agent and the additive to prepare powder; and finally, mixing and stirring the slurry and the powder, adding steel fibers, and stirring to obtain the wind power grouting material. The wind power grouting material is prepared by compounding the modified nano aluminum oxide and the modified nano hydrated calcium silicate, and has the characteristics of good fluidity, ultrahigh early strength, micro-expansion, erosion resistance and durability.

Composite cement compositions and pumpable slurries for cementing well or at least one zone of the wells are provided and comprise cementitious material that forms calcium silicate hydrates upon exposure to water, inert filler material, nano-sized calcium carbonate particles, and water, wherein the cementitious material has a mean particle size of at least about 0.5 micron and no more than about 20 microns, the inert filler material has particle sizes of at least about 25 microns and no more than about 2 millimeters (mm), and the compositions and slurries have densities of at least about 9.5 pounds per gallon (ppg) and no more than about 12.5 ppg and solid volume fractions of at least about 50%. Methods of cementing the wells or the at least one zone of the wells are also provided and comprise pumping the compositions and slurries into the well and allowing the compositions and slurries to set or cure to form or produce lightweight composite cements having compressive strengths of greater than 400 pounds per square inch.

Composite cement compositions and pumpable slurries for cementing well or at least one zone of the wells are provided and comprise cementitious material that forms calcium silicate hydrates upon exposure to water, inert filler material, nano-sized calcium carbonate particles, and water, wherein the cementitious material has a mean particle size of at least about 0.5 micron and no more than about 20 microns, the inert filler material has particle sizes of at least about 25 microns and no more than about 2 millimeters (mm), and the compositions and slurries have densities of at least about 9.5 pounds per gallon (ppg) and no more than about 12.5 ppg and solid volume fractions of at least about 50%. Methods of cementing the wells or the at least one zone of the wells are also provided and comprise pumping the compositions and slurries into the well and allowing the compositions and slurries to set or cure to form or produce lightweight composite cements having compressive strengths of greater than 400 pounds per square inch.

To provide a cement substitute composition that does not use cement, in which the composition can be handled safely, a usable time is equivalent to that of conventional cement compositions, and the properties of the composition before hardening can be easily adjusted, and to provide a hardened body thereof.SOLUTION: A biomass incineration ash-containing composition for producing a hardened body comprises: a biomass incineration ash; and an aqueous solution of salt having a salt concentration of 2.0 mass% or more. According to the present invention, a calcium silicate hydrate (C-S-H) is formed when both are mixed, and a hardened body can be obtained without the use of cement. The present invention also provides the hardened body of the biomass incineration ash-containing composition of the present invention.SELECTED DRAWING: Figure 1

A method to produce cementitious materials from low-cost fillers and use of the cementitious materials as supplementary cementitious materials (SCM). The method comprises coating filler particles (e.g., limestone particles) with fine pozzolanic particles (e.g., nanosilica particles), producing composite particles with inert cores and reactive surfaces. When introduced into a cementitious environment, the reactive coating is converted to a binder (e.g., calcium-silicate-hydrate) through pozzolanic or similar reactions, cementing the filler particles together.

The invention discloses a method for preparing hydrated calcium silicate through deep defluorination of fluorosilicon slag. Fluorine silicon slag is used as a raw material, high-purity silicon dioxide gel is prepared after deep defluorination, and then hydrated calcium silicate is prepared by using the high-purity silicon dioxide gel as a raw material. The method disclosed by the invention is simple in process, low in cost, high in purity, relatively high in reaction efficiency and more sufficient in reaction, more importantly, high-valued reutilization of the fluorosilicon slag is realized, and the problems of stockpiling waste and environmental pollution of the fluorosilicon slag are solved.

The application discloses a kind of high-temperature-resistant super-high-flow nano-modified polymer grouting materials and its preparation method and application, belong to geotechnical engineering technical field, the application is with composite Portland cement, fly ash and silica fume as basement, synergic calcium hydroxide, sodium carbonate, cellulose nanofiber, tannic acid controls its hydration process, fluidity and mechanical strength, nano-modified cementation particle is injected into deep surrounding rock, can keep high fluidity in high-temperature environment for a long time, effectively expand grouting diffusion range, and can realize the accurate control of grouting material gelation time.Meanwhile, high mass fraction fly ash and silica fume are excited to produce calcium silicate hydrate, solve the current conventional calcium silicate grouting cementing material in high-temperature environment poor reinforcement impermeability effect, slurry body is easy to crack and other problems.

The invention discloses an ultra-high-toughness multifunctional self-assembly C-S-H gel material and preparation method thereof. The ultra-high-toughness multifunctional self-assembly C-S-H gel material includes several stacked core-shell structure layers, wherein the core-shell structural layer is composed of several core-shell structure particles; the core-shell structure particles are composed of calcium silicate hydrate nanoparticles as the core and poly(acrylamide-co-acrylic acid) as the shell. The obtained ultra-high-toughness multifunctional self-assembly C-S-H gel material has high toughness, good tensile performance and temperature sensitive effect.