63 results about "Calcium silicate hydrate" patented technology

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 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 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 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.

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 a multifunctional early-strength admixture for concrete as well as a preparation method and application of the multifunctional early-strength admixture. The admixture disclosed by the invention is fibrous composite particles formed by reacting TasA protein, xanthan gum, floating beads, calcium sulfate dihydrate, nano calcium silicate hydrate and nano aluminum oxide components through a special process. Different functional components rapidly form a whole through self-assembly of the protein fiber, the protein fiber is used as an intelligent effect aggregate, ettringite generated in the preparation process is used as a skeleton auxiliary structure, and the admixture is introduced into a concrete admixture system by utilizing the shear thinning intelligent characteristic of the biological protein fiber, so that the concrete admixture is prepared. The additive can maintain and improve the stage workability and working performance of a concrete mixture, can improve the early strength of concrete, and can realize intelligent regulation and control of concrete rheological properties and early development of mechanical properties when applied to concrete.

[Problem] To provide a friction material which is used for a disc brake of an automobile or the like, is molded from a friction material composition of an NAO material that does not contain a copper component, has excellent heat fading resistance and wear resistance, and has good moldability. [Solution] Provided is a friction material for a disc brake pad, which is obtained by molding a friction material composition that contains a binder, a fibrous base material, an organic friction adjusting material, an inorganic friction adjusting material, a lubricating material, and an NAO material that does not contain a copper component, the friction material composition contains 5-10 wt% of aramid fiber as a fiber base material relative to the total amount of the friction material composition, 5-15 wt% of non-whisker-shaped titanate as an inorganic friction adjusting material relative to the total amount of the friction material composition, and 0.5-0.5 wt% relative to the total amount of the friction material composition. 5 wt% of hydrated calcium silicate particles; and 1-4 wt% of a metal sulfide as a lubricating material relative to the total amount of the friction material composition.

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 relates to the technical field of building materials, in particular to a nano calcium silicate hydrate surface modified fiber, a cement-based material and a preparation method of the cement-based material. The preparation method provided by the invention comprises the following steps: mixing a crystal nucleus growth inhibitor, an emulsifier and water to obtain an emulsion containing the inhibitor; mixing the emulsion containing the inhibitor, a soluble calcium source aqueous solution and a soluble silicon source aqueous solution, and then adding alkali to adjust the pH value to obtain a modifier solution; mixing and stirring fibers and the modifier solution; according to the present invention, the agglomeration of the fiber can be reduced, the uniformity of the composite system can be improved, the adhesion with the cement-based material can be increased, the toughening effect of the fiber can be completely performed, and the cement-based material has characteristics of large fiber doping amount, ultrahigh tensile strength and the like.

The invention discloses a composition for an auxiliary cementing material and a preparation method thereof. The method comprises: contacting an input stream with a mechanical thermal activation aid; heat treating the input stream to form a heat treated input stream; and cooling the heat-treated input stream and obtaining the auxiliary cementitious material. The method may also include carbonating the heat treated input stream. The method may also include modifying the network structure with a mechanical thermal activation aid. The composition comprises: a calcium silicate hydrate bond; an auxiliary cementing material; and a mechanical thermal activation aid. The composition may also include a carbonate salt. The composition may also include a biomass.

The present invention provides a low-carbon mortar or concrete composition and a method for producing mortar or concrete that exhibits excellent initial strength development, durability, and productivity. [Solution] The composition contains a binder made of blast furnace slag fine powder and rapid-strength Portland cement, water, fine aggregate including blast furnace slag fine aggregate, and a nanoparticle-based rapid-strengthening agent made of calcium silicate hydrate nanoparticles. The mortar or concrete composition is mixed while it is still wet, then wrapped in an insulating material and cured without applying heat to produce mortar or concrete.

The invention provides a preparation method of a hydrated calcium silicate-hydrated calcium aluminosilicate composite hydration product and application of the hydrated calcium silicate-hydrated calcium aluminosilicate composite hydration product in chlorine-containing titanium extraction tailing-based building materials. The method comprises the following steps: weighing a siliceous raw material, a calcium raw material and an aluminum raw material according to an Al / Si molar ratio and a Ca / Si molar ratio; the method comprises the following steps: mixing a siliceous raw material, a calcium raw material and an aluminum raw material, preparing into a solution, and controlling the pH value of the solution; the solution is stirred regularly in the heat preservation process, and the pH value of the solution is kept; carrying out suction filtration and washing on the solution subjected to heat preservation to obtain a solid product and filtrate; and drying the solid product to obtain the hydrated calcium silicate-hydrated calcium aluminosilicate composite hydration product. The calcium silicate hydrate-calcium aluminosilicate hydrate composite hydration product can be applied to preparation of green building materials with chlorine-containing titanium extraction tailings as raw materials, the chloride ion curing rate can be increased, and the problem that the chloride ion curing rate is low when the chlorine-containing titanium extraction tailings as the raw materials are used for preparing the green building materials in the prior art is solved.

The invention provides a quick-hardening early-strength high-compression-resistance anti-freezing cement material and a preparation method thereof, and belongs to the technical field of cement materials, the cement material comprises Portland cement clinker, natural anhydrite, calcined kaolin, calcined quartz powder, a silicon-aluminum-titanium composite mineralized early-strength anti-freezing agent, a crystal bridge-pore bifunctional agent and the like. The silicon-aluminum-titanium composite mineralized early-strength antifreeze agent is prepared by sintering bauxite, silica fume, titanium dioxide, anhydrous calcium chloride and trisodium citrate, carrying out thermal reaction after quenching and carrying out KH-550 surface modification. The crystal bridge-pore bifunctional 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 the following steps: shearing and emulsifying an oil phase prepared from styrene, butyl acrylate, divinyl benzene and polyglycerol-10 diisostearate and a water phase prepared from deionized water, lauryl sodium sulfate and polyethylene glycol allyl methyl ether, adding ammonium persulfate for reaction, and adding tetraethoxysilane for reaction.

The present invention relates to the field of hydraulic cements and hardened materials obtained after hydration of said hydraulic cements, in particular cements useful in the medical field, such as dental cements. In particular, the present invention provides a hydraulic cement comprising calcium silicate particles and calcium carbonate particles having a specific particle size. Hydration of the hydraulic cement of the present invention can provide a hardened composite material having enhanced properties, comprising calcium silicate particles dispersed in a solid dispersion phase comprising calcium silicate hydrate (CSH) and a porous interparticulate region of insoluble calcium carbonate particles having a particle size of 1 nm to 1500 nm. 50 a porous interparticulate region of insoluble calcium carbonate particles having a particle size of 1 nm to 1500 nm.

The present application relates to the technical field of wastewater treatment, and particularly relates to a composite cementing material and a method for fixing heavy metals. The method for fixing heavy metals comprises the following steps: S1: adjusting the pH value of a heavy metal-containing solution to 1-3 to obtain mixed water A; S2: mixing inorganic cementing material, mixed water A and mixed water B to obtain mixed slurry, and then curing; wherein the inorganic cementing material comprises silicate cement clinker, sulphoaluminate cement clinker and gypsum; and the mixed water B is a calcium silicate hydrate aqueous solution. By optimizing the pH value of the heavy metal-containing solution during the fixing of heavy metals, the present application can effectively enhance the anti-leaching effect of the cement-based cementing material after fixing heavy metals, reduce the leaching concentration of heavy metals, and improve the mechanical properties of the cementing material after fixing heavy metals.