95 results about "Ettringite" patented technology

The invention belongs to the technical field of industrial solid waste resource recycling, and discloses a nano composite filling material based on in-situ acid-base mutual modification enhancement and application thereof. According to the nano composite filling material, the alkalinity of the red mud and the acidity of the desulfurized gypsum are used for neutralization, the alkalinity of a system is reduced, a synergistic reaction is excited, a large number of ettringite crystals playing a key enhancing role are generated under the regulation and control of a nano material, and the ettringite crystals and a geopolymer form an interpenetrating network structure. The obtained slurry is low-viscosity and high-fluidity Newtonian fluid (diffusivity gt and 250 mm), the 7-day strength is larger than 2.0 MPa, the pH value is 7-9, and the fluorine ion concentration is lt; and the leaching of heavy metal ions is qualified, and the method is environment-friendly and safe. Efficient resource utilization of the red mud and the desulfurized gypsum is achieved, and the method is simple in process, low in cost and especially suitable for mine filling and engineering backfilling.

The invention discloses marine concrete resistant to chlorine salt erosion and a preparation method thereof, and belongs to the technical field of building materials. The marine concrete is prepared from the following components in parts by mass: 280 to 350 parts of cementing material, 1100 to 1200 parts of aggregate, 150 to 180 parts of mixing water and 2.5 to 4.0 parts of high-efficiency water reducing agent, and the cementing material is prepared from 210 to 270 parts of ordinary Portland cement, 50 to 70 parts of superfine slag powder and 10 to 20 parts of modifier on the basis of the cementing material; on the basis of the modifier, the modifier is prepared from 30 to 45 parts of hexacalcium aluminoferrite, 25 to 35 parts of metaettringite, 20 to 35 parts of tobermorite, 3 to 6 parts of nano attapulgite and 2 to 4 parts of a nano composite material. The components can accelerate the early hydration of cement and the volcanic ash reaction process in the concrete hardening process, so that the concrete can form a compact microstructure in the curing period and cooperate with the curing effect of a hydration product on chloride ions, thereby remarkably improving the chloride ion penetration resistance of the concrete, prolonging the service life of the structure and improving the concrete quality. The method is suitable for port engineering, maritime work structures and buildings in salinized soil areas.

The invention relates to a portland cement product for negative temperature and application thereof, in particular to application of a negative temperature product containing portland cement clinker and an anti-freezing agent in preparation of a negative temperature product capable of maintaining mechanical properties under a negative temperature condition. According to the present invention, the negative temperature environment applicability is strong, the temperature range of the conventional winter construction can be reached, the rapid strength development rate can be maintained in the negative temperature environment, the hydration heat release peak is advanced by 2-3 h, the construction requirement without the external heat source can be met, the hydration product mainly comprises ettringite and C-S-H, and the foundation is established for the cement product strength. The adopted mixing solution not only can prevent freezing, but also can accelerate coagulation. On one hand, the anti-freezing agent is added into the water, so that the vapor pressure of the water is changed, and the freezing point of the solution is reduced; and on the other hand, the anti-freezing agent contains a component for promoting hydration of the sulfur silicate cement, so that the sulfur silicate cement can be rapidly hydrated under a negative temperature condition, and the purposes of rapid setting and hardening and strength improvement of a cement product are achieved.

The present application relates to the technical field of foam concrete preparation, in particular to foam concrete based on ettringite micro-expansion effect and a preparation method thereof, the preparation method comprising the following steps: S1. preparation of modified ettringite; S2. dry material premixing; S3. preparation of additives; S4. concrete forming. The modified ettringite and modified calcium sulfate synergize to significantly improve the interfacial bonding strength of aggregate-matrix, so that the early and medium-term compressive strength of the composite system is improved; at the same time, the improved pore structure forms a triple action mechanism of "ettringite reinforcement-pore optimization-stress buffering": ettringite improves the interfacial bonding and shrinkage compensation capacity, the dissolution space of aggregate absorbs the volume deformation stress, the pore structure optimization reduces the humidity diffusion gradient, and the strength-shrinkage synergistic control is realized.

The application discloses a quaternary solid waste-based soil stabilizer (GSCP) for a base layer, which is composed of slag (GGBFS), steel slag (SSA), calcium carbide slag (CS) and phosphogypsum (PG) and has a weight ratio of GGBFS:SSA:CS:PG=56:24:12:8. The stabilizer forms C-S-H colloid and ettringite (AFt) through alkaline activation and sulfate activation, does not need to add cement or chemical activator, is used for stabilizing silty clay and steel slag mixed soil, and significantly improves the unconfined compressive strength, splitting tensile strength, water stability and freeze-thaw resistance. Compared with a traditional cement-based stabilizer, the application reduces carbon emission by 82% and cost by 31.25%, provides a low-carbon and economical solution for road engineering, and is suitable for the base layer and the subbase layer of a secondary road or above.

The invention discloses fibrous ettringite, a light cement aerogel material for a pipeline lining based on the fibrous ettringite and a preparation method of the light cement aerogel material. The light cement aerogel material for the pipeline lining is prepared from a solution obtained by mixing and stirring fibrous ettringite, cement, an adhesive, a dispersing agent, a hydrophobic component, a foaming component and water through a directional freezing technology, wherein the fibrous ettringite is prepared by heating and stirring a calcium nitrate solution, an aluminum sulfate solution and a sodium hydroxide solution. According to the invention, ettringite which can be uniformly dispersed is synthesized by a ligand-free thermal injection method, and the ettringite, cement and an adhesive raw material are subjected to freezing pore-forming by adopting a directional freezing technology, so that the aerogel material with a special organic-inorganic framework directional ordered pore structure has the characteristics of light weight, high strength, flame retardance and the like; and the overall performance of the pipeline lining material can be improved.

This invention discloses a special reinforcing steel fiber for all-solid waste concrete and its modification method, belonging to the field of building materials technology. The reinforcing steel fiber uses recycled steel fiber from automobile tires as the core raw material. Through a graded process of raw material pretreatment, dopamine coating, and ettringite deposition modification, a chemical bonding layer and a microstructure reinforcing layer are formed on the fiber surface, significantly improving its interfacial bonding performance with the all-solid waste concrete matrix. The suitable all-solid waste concrete system consists of granulated blast furnace slag powder, industrial by-product gypsum, alkaline industrial by-products, and iron tailings sand, achieving 100% solid waste utilization. When the modified steel fiber content is 1-2%, the 28-day compressive strength of the concrete increases by over 10%, and the flexural strength increases by over 100%, combining environmental friendliness and high performance, providing an innovative solution for solid waste resource utilization and building material upgrading.

The invention discloses all-solid-waste low-carbon vegetation concrete and a preparation method thereof, and belongs to the technical field of building materials. The all-solid-waste low-carbon vegetation concrete is prepared from a solid waste cementing material, solid waste coarse aggregate, fibers, a water reducing agent and water, the solid waste cementing material is prepared from the following raw materials in parts by mass: 55 to 90 parts of slag powder, 5 to 20 parts of industrial byproduct gypsum, 5 to 12 parts of rice hull ash, 5 to 15 parts of magnesium slag powder and 1 to 3 parts of carbide slag. The all-solid-waste low-carbon vegetation concrete designed by the invention has the advantages of low alkalinity, good durability, high utilization rate of solid waste resources and the like, and is low in total energy consumption and carbon emission due to no addition of cement. In an acid environment, the stability of a hydration product ettringite generated by the gelling system is higher than that of calcium hydroxide, and an obtained solid waste-based gelling material hardened body is more compact, can prevent hydrogen ions in the environment from entering the solid waste-based gelling material hardened body and has excellent acid corrosion resistance.

The invention provides ardealite-based fine aggregate as well as a preparation method and application thereof, and relates to the technical field of building materials. The phosphogypsum, the calcium-based alkaline material and the slag are compounded for use, and the calcium-based alkaline material generates alkaline excitation on the slag to promote rapid dissolution of the slag and participate in a hydration reaction; sulfate in the ardealite excites the slag to generate gelling property, a large number of amorphous phases exist in the slag, the aggregate is gradually hydrated under composite excitation of alkalinity and salt, C-(A)-S-H gel and ettringite are formed, main strength is provided for the ardealite-based fine aggregate, the ardealite-based fine aggregate continues to be slowly hydrated in the curing process, and the curing effect is good. The strength is further improved, and the cylinder compressive strength of the ardealite-based fine aggregate prepared by the embodiment is up to 12.8 MPa. In addition, by adopting a mode of pressing into balls (the pressure is 15-20MPa) through two pressurizing rollers, the compactness of the ardealite-based fine aggregate is improved.

The invention provides aluminum electrode corrosion foil by-product-based wet-mixed plastering mortar and a preparation method thereof, and belongs to the technical field of solid waste resource utilization. Calcium hydroxide generated by hydration of cement, calcium sulfate and aluminum hydroxide in the aluminum-containing electrode corrosion foil byproducts and silicon dioxide and aluminum oxide in the fly ash are utilized to generate calcium silicate, calcium aluminate and ettringite gel with cohesiveness and water resistance, the expansion performance of the ettringite gel is utilized, and the corrosion resistance of the aluminum-containing electrode corrosion foil is improved. The cohesiveness and the strength of the mortar are further enhanced, and the crack resistance and the water resistance of the mortar are improved; the dispersing agent is added to improve the dispersity of the raw materials; by adding the air entraining agent, the viscosity of the mortar is reduced, and the crack resistance and toughness are improved; by limiting the mass content of each raw material, the performance of the wet-mixed plastering mortar can meet the standard requirements; and the uniformity and construction performance of the mortar are ensured by limiting the particle size of the aluminum electrode corrosion foil byproduct and the consistency of the wet-mixed plastering mortar.

The invention discloses a preparation method of a water-permeable material for a water-permeable tree surrounding brick, belongs to the technical field of preparation of water-permeable brick materials, and aims to solve the technical problem that the mechanical property and durability of the water-permeable tree surrounding brick prepared from the water-permeable material in the prior art need to be further improved. The zwitterionic grafted porous silicon-aluminum dispersion, the magnesium-silicon gel composite magnesium carbonate dispersion and the ettringite composite hydroxyapatite whisker are introduced in the preparation process, and a continuous cementation structure, an interface transition structure and a space constraint support structure are cooperatively constructed on different structural scales; a stable and matched composite system is formed among the cementing phase, the aggregate and the pore structure, and the coordination and stability of the whole structure of the water-permeable tree surrounding brick are effectively maintained through the synergistic configuration of the multiple components in the system, so that the structure integrity and the use reliability are considered while the material meets the water-permeable requirement; the method is suitable for the field of garden and municipal permeable pavement.

The utility model belongs to the field of water treatment, and particularly relates to a wastewater hardness removal system for nanofiltration coupling induced crystallization. The wastewater hardness removal system comprises a nanofiltration unit, a gypsum reactor and an ettringite reactor. Wherein the nanofiltration unit is configured to add a scale inhibitor into the wastewater, so that calcium ions and sulfate ions are supersaturated, and divalent salt is intercepted, so that the divalent salt is enriched on a nanofiltration concentrated water side; the gypsum reactor is communicated with a nanofiltration concentrated water liquid outlet of the nanofiltration unit and is configured to add an agent for destroying a scale inhibitor, so that calcium ions and sulfate ions are combined to produce calcium sulfate crystals; the ettringite reactor is communicated with the liquid outlet of the gypsum reactor, and is configured to add alkali and aluminum salt, further remove hardness of the liquid discharged from the gypsum reactor, and produce ettringite. Therefore, the consumption of the chemical agent is low, the subsequently added sodium carbonate can be reduced, meanwhile, the increase of ion concentration caused by adding the chemical softening agent is reduced, and the treatment pressure of a subsequent water treatment system is reduced.

This invention provides a method for quantitatively assessing the degree of sulfate attack on concrete, relating to concrete attack assessment technology, including: plotting SO4... 2‑ Concentration standard curve; determination of free SO4 in the sample. 2‑ Content, denoted as C （游离） Determine the total SO4 content of the same mass of test samples from the same source. 2‑ Content, denoted as C （总） C （总） With C （游离） The difference is the content of bound sulfate ions in the sample to be tested, denoted as C. （AFt，AFm） ; Calculate the bound sulfate content C per gram of the sample to be tested. 1 （AFt，AFm） :;C 1 （AFt，AFm） The value represents the amount of ettringite and monosulfide-type hydrated calcium sulfoaluminate formed. Using the formation of ettringite and monosulfide-type hydrated calcium sulfoaluminate as an evaluation index, the degree of sulfate attack on concrete is assessed. This method achieves a quantitative assessment of the degree of sulfate attack on concrete from the perspective of the chemical nature of the attack, and features accurate quantification, simple operation, and the ability to distinguish SO4. 2‑ Advantages such as shape.

The present application relates to solid waste resource utilization and carbon capture and utilization technical field, disclose a kind of using steelmaking waste gas to reduce the carbon sequestration treatment method of free calcium oxide of steel slag, comprising: steel slag, desulfurization gypsum, papermaking caustic white mud, waste building gypsum board powder and blast furnace water quenching slag are proportioned according to mass ratio, with mine acid wastewater to regulate alkaline slurry, into steelmaking waste gas and carry out wet carbonization disposal;During carbonization disposal, caustic white mud superfine particle is used as heterogeneous nucleation seed to accelerate f-CaO carbonization, three-way cascade supply guarantees uniform formation of ettringite, and mineral powder C-S-H gel is coated paper fiber and is converted into reinforcing phase;Carbonization product is obtained by pressure filtration dewatering and low-temperature drying.The present application realizes permanent mineralization and immobilization of steelmaking waste gas and efficient and complete digestion of f-CaO of steel slag, and multiple types of industrial solid waste and mine acid wastewater are disposed simultaneously, and the product can be used for mine filling and roadbed stabilizing material.

This invention discloses a fly ash-based fluidized solidification material, its preparation method, and its application. The fluidized solidification material is obtained by curing fly ash with a curing agent composed of an alkali-activated material, a cementing material, a water-reducing agent, and a filler. The alkali-activated material is sodium hydroxide or carbide slag; the cementing material is granulated blast furnace slag powder; the filler is desulfurized gypsum; and the water-reducing agent is sodium hexametaphosphate, magnesium lignosulfonate, or a mixture of both. The alkali-activated material has a synergistic activating effect on the Ca-Si-Al active components in the cementing material, promoting the formation of hydrated calcium silicate gel and ettringite crystal phases, strengthening the material's mechanical properties, and increasing the density of the pore structure. The water-reducing agent optimizes the hydration reaction process, reduces the water-ash ratio, and inhibits the system's tendency to shrink and crack. The desulfurized gypsum partially replaces the alkali-activated material, filling the material's pores, improving the material's unconfined compressive strength, and reducing the material's permeability coefficient. It can be used as an ex-situ barrier material with excellent mechanical properties, impermeability, and durability.

The invention relates to the technical field of concrete, and particularly discloses a modified steel slag mixture and a preparation method and application thereof, the modified steel slag mixture comprises modified steel slag, Portland cement, fly ash, silica fume, activated coal gangue and emulsified asphalt; the modified steel slag is prepared from the following raw materials: steel slag, phosphate modified graphene oxide, a polycarboxylate superplasticizer, water glass and sodium sulfate; the phosphate-modified graphene oxide is prepared from the following raw materials: organophosphate and graphene oxide. According to the invention, the P-GO is anchored on the surface of the steel slag, so that agglomeration of a nano material in a cement matrix is avoided. The anchored P-GO captures Fe < 3 + > dissolved out of the C2F in situ, and drives the C2F to be continuously dissolved; the dissolved Fe < 3 + > and Ca < 2 + > are quickly consumed by the water glass and the sodium sulfate, C-(F)-S-H gel and ettringite are generated, circulation is formed, and the problems of insufficient early strength and poor volume stability of the steel slag are synchronously solved.

The invention discloses an oil well cement fluid loss agent suitable for preventing thickening time from hanging upside down in a medium temperature section of 80-90 DEG C and a preparation method thereof. The oil well cement fluid loss agent comprises the following components: a 2-acrylamido-2-methyl propanesulfonic acid potassium solution, a cyclic monomer, a carboxylic acid monomer, an amide monomer and a chain transfer agent. The API (American Petroleum Institute) water loss of cement paste prepared by adding the oil well cement fluid loss agent into cement is less than or equal to 50mL at 80-90 DEG C, no obvious upside-down phenomenon exists in the thickening time, and the 24-hour compressive strength is more than or equal to 20MPa. According to the invention, the 2-acrylamido-2-methyl propanesulfonic acid sodium salt is replaced by the 2-acrylamido-2-methyl propanesulfonic acid potassium salt; in the temperature interval of 80-90 DEG C, early hydration can be accelerated, so that aluminate radical outbreak in cement is inhibited, a polymer adsorption layer is locked, carboxyl is prevented from being released, secondary delayed coagulation is avoided, an ettringite crystal phase is stabilized, ettringite is inhibited from being converted into a single sulfur type, and the phenomenon of thickening time upside down in the temperature interval of 80-90 DEG C is prevented.

The invention discloses a preparation method of a hydraulic cementing material for synergistically recycling coal gangue and mine water concentrated carnallite. According to the method, mine water carnallite, coal gangue, kaolin, calcium oxide and water are taken as main raw materials, firstly, metakaolin with potential activity is obtained by calcining the kaolin, then the proportion of the mine water carnallite, the metakaolin, the calcium oxide and the water is optimized by adopting an orthogonal experiment method, and the hydraulic cementing material with good mechanical properties is prepared. And an optimal ratio is determined through a compressive strength test. And then coal gangue is introduced as aggregate, so that the overall structural stability and compressive property of the material are further improved. According to the method, sulfate radicals in the mine water carnallite react with calcium oxide to generate stable hydration products such as ettringite, the gelling performance is improved, resource utilization of coal gangue is achieved, and a stable curing system is formed. The method has good hydraulicity, environmental adaptability and solid waste co-processing potential, and is suitable for the fields of industrial solid waste resource utilization and green cementing material development.

The invention belongs to the technical field of filling mining, and particularly relates to a preparation method of an early strength filling material based on temperature-sensitive microcapsules. The preparation method comprises the following steps: adding an early strength agent into a wall material-ethanol solution, stirring, cooling, centrifugally filtering and drying to obtain a temperature-sensitive microcapsule, and mixing the temperature-sensitive microcapsule with Portland cement, coal gangue, fly ash and water to obtain the early strength filling material. The early-strength filling material has remarkable advantages in the aspects of mechanical property, working performance and long-term stability, the early-strength agent wrapped by the microcapsules is triggered to release at a proper time and is subjected to a synergistic hydration reaction with a cementing material, the early-strength development track of a filling body can be remarkably improved, rapid generation of ettringite is effectively promoted through release of the early-strength agent, and the early-strength filling material has a good application prospect. And coal-based solid wastes such as the coal gangue and the fly ash are selected as raw materials, so that large-scale treatment and utilization of the gangue solid wastes are realized, and the method is green, economical and environment-friendly.

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 method for analyzing and predicting the retarding performance of sulphoaluminate cement, and relates to the technical field of building materials, which comprises the following steps: characterizing the mineral composition of cement through XRF, screening out retarders such as boric acid or citric acid / sodium gluconate and the like, and testing the compatibility of the retarders with a water reducing agent and environmental factors; monitoring a hydration dynamic process and a slurry dispersion state by using an isothermal calorimetric method and Zeta potential; the setting time and strength are tested according to the national standard, and special verification is carried out for a negative temperature environment (sodium nitrite and dimethyl sulfoxide are compounded at the temperature of-10 DEG C, and the sand-cement ratio is 1: 1.5) and ocean engineering (the corrosion resistance coefficient K28 is required to be larger than 0.85, and the strength loss is smaller than 15%); microstructural analysis is carried out through XRD / SEM, and the morphology and pore change of ettringite are observed. The prediction method comprises the following steps: establishing a multiple linear regression empirical model based on an orthogonal test to predict the coagulation time; constructing a micro-mechanical model to accurately predict the low-temperature tensile strength; and adopting random forest algorithm machine learning to assist in optimizing retarder combination selection.

The invention provides a concrete carbon sequestration material proportion optimization method, and belongs to the technical field of concrete carbon sequestration. Nitrogen fixation efficiency, sulfur fixation efficiency, carbon sequestration efficiency and pore liquid phase ion concentration distribution of each proportion are measured through a three-component gradient test matrix; inputting test data into a curing collaborative optimization model based on a matrix decomposition low-rank approximate optimization mechanism, outputting an optimization ratio vector and a gradient functional layer thickness parameter under multi-target constraint through singular value decomposition and an alternating minimization strategy, preparing a verification sample, and monitoring mechanical properties and ettringite delayed expansion rate; the secondary release risk of sulfate radicals is evaluated through a long-term leaching test, the mixing amount of the geopolymer exciting agent is adjusted, and the technical problem that when the concrete material fixes multiple pollutants at the same time, due to competitive adsorption among all components, the overall curing efficiency is difficult to synergistically improve is solved.

This invention relates to the field of mine backfilling applications, specifically to a CO2-solidified industrial solid waste-based slurry for mine backfilling, comprising the following raw materials in parts by weight: 85-105 parts solidifying agent, 15-22 parts sludge, 3-5 parts construction waste particles, 5-10 parts amine-functionalized porous material, 1.2-2.4 parts municipal solid waste particles, 0.5-2.5 parts rheology modifier, 0.1-0.5 parts setting regulator, and 0.1-0.5 parts defoamer; the solidifying agent, by weight percentage, includes 25-35 parts ettringite, 2-12 parts yellow phosphorus slag, 3-8 parts phosphogypsum, 4-16 parts modified fly ash, 3-10 parts desulfurized gypsum, 2-5 parts steel slag, and 3-5 parts tailings. By optimizing the solid waste combination and activation process, the slurry can actively adsorb / mineralize CO2 during the backfilling and solidification process, achieving the dual goals of increasing the strength of the backfill and reducing carbon emissions.

The invention relates to a selection method and an evaluation method of fibers and additives for a cement-based material based on surface attachment characteristics, and the selection method comprises the following steps: doping an additive into cement slurry, soaking fibers to be selected into the additive to obtain mixed slurry, curing, fishing out the fibers in the slurry by using a filter screen after the cement slurry reaches the age, cleaning and drying; the method comprises the following steps: placing fibers in a sealing bag for rolling to obtain fibers with attachments remained on the surfaces and attachment powder stripped from the surfaces of the fibers, respectively weighing the mass, observing the fibers under an SEM (scanning electron microscope), and carrying out XRD (X-Ray Diffraction) phase analysis on the attachment powder; if surface attachments are not easy to fall off and calcium silicate hydrate and ettringite alternately grow on the surfaces of the fibers and form a compact layer of 0.1-0.3 mu m, selection of the fibers and the additives is completed, and if the surface attachments are few and the compact layer is not formed, the steps are repeated for continuous selection. According to the method, fibers and corresponding additives which have relatively high binding force with a cement matrix can be preferably selected.

A method for treating sulphate-bearing wastewater that recovers and recycles aluminium trihydroxide used in ettringite precipitation. The method selectively dissolves a portion of ettringite to generate aluminium sulphate, which is used to regenerate aluminium trihydroxide from remaining ettringite. Gypsum containing entrained aluminium trihydroxide is recycled for further aluminium recovery.

This invention belongs to the technical field of building waterproofing and leak-stopping materials, specifically relating to a leak-stopping material and its preparation method. The leak-stopping material of this invention comprises: powder and liquid components. The liquid component includes water. By mass parts, the powder comprises: 40-60 parts of sulfoaluminate cement, 10-20 parts of ordinary silicate cement, 15-25 parts of composite filler, 3.0-5.0 parts of ettringite precursor, 0.04-0.1 parts of water-reducing agent, 0.05-0.1 parts of hydroxypropyl methylcellulose ether, and 1.0-3.0 parts of penetrating crystallizing active powder. By mass parts, the liquid component comprises: 50-95 parts of deionized water and 5-50 parts of silicone-acrylic anti-permeability emulsion. The composite filler is fly ash modified with a silane coupling agent, and the particle size of the composite filler is 5-10 μm. The leak-stopping material of this invention has low water absorption, excellent corrosion resistance, good mechanical properties, and durability.

The invention provides dry-mixed plastering mortar containing aluminum electrode corrosion foil waste and a using method of the dry-mixed plastering mortar, and belongs to the technical field of solid waste resource utilization. Calcium hydroxide generated by hydration of cement, calcium sulfate and aluminum hydroxide in the aluminum-containing electrode corrosion foil waste and silicon dioxide and aluminum oxide in the fly ash are utilized to generate calcium silicate, calcium aluminate and ettringite gel with cohesiveness and water resistance, and the expansion performance of the ettringite gel is utilized to improve the water resistance of the aluminum-containing electrode corrosion foil waste. The cohesiveness and the strength of the mortar are further enhanced, and the crack resistance and the water resistance of the mortar are improved; by adding the water reducing agent and the air entraining agent, the dispersity of the raw materials is improved; by adding the air entraining agent and the fiber, the crack resistance and the toughness are improved.

The invention discloses a preparation method of a multifunctional concrete admixture. The preparation method of the concrete multifunctional admixture comprises the following steps: firstly, mixing an oil phase system A formed by PVC and an organic solvent, Span-80, ettringite and calcium carbonate to obtain a solution B, and then emulsifying the solution B with a sodium thiosulfate solution to obtain an emulsion D; secondly, dropwise adding the emulsion D into a PVA emulsion, stirring to form a double emulsion E, stirring, centrifuging, washing, precipitating and drying to obtain microspheres F; and finally, mixing the microspheres F with a sodium sulfate solution, PVA and nano ferroferric oxide to obtain a turbid liquid I, mixing PVC with a plasticizer, a solvent and Span-80 to obtain an oil phase system G, dropwise adding an emulsion J emulsified by I and G into a PVA emulsion, and carrying out after-treatment to obtain the multifunctional concrete admixture. The admixture prepared by the method disclosed by the invention is a microsphere-in-microsphere structure body, so that the integration of concrete early strength and crack repair functions is realized, and the problem of concrete shrinkage cracks caused by early strength can be quickly solved.

The invention provides early-strength self-expanding corrosion-resistant cement and a long-term performance stabilizing method thereof. The high-sulfur high-calcium iron-rich phase low-carbon corrosion-resistant cement clinker is prepared by taking phosphogypsum, steel slag powder, salty mud, limestone and alumina as raw materials, 1200 DEG C isothermal heat treatment is innovatively embedded in a clinker quenching process, and the overall mechanical property is optimized; and meanwhile, auxiliary cementing materials such as limestone mine tail powder, lithium slag powder and desulfurized gypsum are mixed and matched with the cement clinker according to the close packing idea to achieve the close packing effect, and the overall mechanical property and durability of the material are guaranteed. The iron-type ettringite nucleation induction-morphology stability improver prepared by the invention can induce generation of iron-type ettringite in a clinker hydration process, improve the early strength of a composite cementing material, change the problem of volume / strength shrinkage of aluminum-rich phase cement in a long-term maintenance process, and further ensure the long-term performance of the composite cementing material.

This invention belongs to the field of solid waste recycling technology, specifically relating to a high-iron red mud-based ferroaluminate cement and its preparation method. The cement comprises the following raw materials in parts by weight: 100 parts high-iron red mud-based ferroaluminate cement clinker, 10-20 parts setting regulator compound, 5-20 parts mineral admixtures, 0.5-2 parts nucleating agent, 1-3 parts full-thiol cyclodextrin compound, and 1.5-3 parts carboxylated chitosan; the high-iron red mud-based ferroaluminate cement clinker raw materials include high-iron red mud, calcareous solid waste, siliceous aluminate solid waste, sulfate solid waste, and aluminous corrective agent; the mineral composition includes 29-45 wt% C4A3, 20-30 wt% C2S, and 18-35 wt% C4AF. Nucleating agents provide nucleation sites, accelerate the early precipitation of gel and ettringite, and compensate for the early strength reduction caused by impurities; fully mercaptocyclodextrin compounds prevent crystal distortion and later strength reduction caused by crystal transformation; carboxylated chitosan assists in chelation and regulates the crystal growth of hydration products to enhance interfacial bonding; the three work together to solve the problems of low early strength and later strength reduction caused by iron ions and other impurities in high-iron red mud.