150 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 a multi-element solid waste synergistic excitation road material and a preparation method thereof. The multi-element solid waste synergistic excitation road material comprises the following raw material components: an activated matrix material (consisting of 85-90% of red mud, 7-15% of carbide slag and 3-5% of ardealite), and silica fume, 1-hydroxyethylidene-1, 1-diphosphonic acid, anhydrous sodium sulfate and water which respectively account for 4-6%, 0.2-0.4%, 0.8-1.2% and 30% of the mass of the activated matrix material. Pores are filled with silica fume in the raw materials, and C-S-H gel with low calcium-silicon ratio is generated, so that a water migration channel is blocked; hydroxyethylidene-1, 1-diphosphonic acid is chelated with free metal ions, saltpetering and ion interference are inhibited, and the ettringite structure is stabilized; carbide slag and ardealite cooperate to destroy a red mud silicon-aluminum network, accelerate dissolution of active ions and promote crystal generation; the anhydrous sodium sulfate accelerates formation of an ettringite framework through exogenous SO4 < 2->; the strength and water stability of the road material can be effectively improved. The raw materials are mainly industrial solid wastes, so that the consumption of natural resources is remarkably reduced, and the efficient collaborative consumption of a large amount of solid wastes is realized.

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 provides an alkali-salt composite excited low-carbon hydraulic cementing material based on an element compatibility method as well as a preparation method and application thereof, and relates to the technical field of building materials. Silica-aluminum solid waste (mainly providing SiO2 and Al2O3), a sulfate solid waste exciting agent (mainly providing alkali metal oxide and / or alkaline earth metal oxide and SO3) and an alkaline solid waste exciting agent (mainly providing an alkalinity environment required by a hydration reaction) are used as main materials to generate a certain content of hydration product ettringite crystals and C (N)-A-S-H gel, and a compatibility method is adopted for design. The relative contents of Ca, Si, Al and S in a cementing system are adjusted while the alkaline solid waste excitant and the sulfate solid waste excitant are compounded and cooperated to excite the silicon-aluminum solid waste, so that the contents of ettringite crystals and hydrated calcium silicate gel in the whole hydration system are controlled, and the early strength and the later strength of the alkali-salt compounded and excited low-carbon hydraulic cementing material are improved.

The invention relates to the technical field of building materials, and particularly discloses high-strength water-resistant anti-freezing plastering spraying mortar and a preparation method thereof. The high-strength waterproof anti-freezing plastering spraying mortar is prepared from the following raw materials in percentage by mass: 2.5 percent to 9.3 percent of high-free calcium belite sulphoaluminate clinker, 20 percent to 50 percent of gypsum, 9.4 percent to 56.5 percent of granulated blast furnace slag powder and 8 percent to 34 percent of lightweight aggregate. Through the design of the high-free-calcium belite sulphoaluminate clinker and the raw material design of the high-strength water-resistant anti-freezing plastering spraying mortar, the high-free-calcium belite sulphoaluminate clinker and the granulated blast-furnace slag powder have a synergistic effect, so that the types, the composition and the microstructure of hydration products of a gypsum-based material can be improved; the water-resistant and high-strength hydration products ettringite and C-(A)-S-H are greatly increased, and dense coating of the ettringite and C-(A)-S-H on dihydrate gypsum is realized, so that the problems of poor water resistance, poor freezing resistance and low strength of gypsum-based mortar are solved.

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 application belongs to the technical field of oil and gas wells, and discloses a large-temperature-difference well cementing cement slurry, a preparation method and application. The cement slurry comprises oil well cement, gypsum, red mud, sulphoaluminate cement, silicon powder, water and an additive. The application improves the large-temperature-difference adaptability of the cement slurry by generating ettringite in the hydration reaction process.

The invention belongs to the technical field of solid waste resources, provides a red-mud-based unfired prefabricated part and a preparation method thereof, and solves the problem that a large amount of red mud cannot be consumed. The concrete is prepared from the following raw materials: 30-35 parts of red mud, 15-20 parts of fly ash, 20-30 parts of quartz sand, 5-8 parts of fluorite, 5-15 parts of desulfurized gypsum, 5-8 parts of Portland cement, 1-3 parts of quick lime, 0.1-1 part of a water reducing agent, 0.5-1 part of a retarder, 2-3 parts of an expanding agent, 1-2 parts of fibers and 10-12 parts of water. According to the method, quicklime is used for providing an alkaline environment, the excitation effect of fluorite and gypsum is activated under the high-alkali condition, F in the fluorite strongly destroys glass bodies of red mud and fly ash to enable the glass bodies to release active silicon oxide, aluminum oxide and other components, sulfate ions in the gypsum are combined with active aluminum ions, and the effect of activating the red mud and the fly ash is achieved. The obtained ettringite improves the early strength of the prefabricated member, and realizes waste reutilization.

The application discloses an anti-permeation low-shrinkage inorganic coating and a preparation method thereof. The anti-permeation low-shrinkage inorganic coating comprises cement material 40-60 parts by mass, active mixed material 15-30 parts by mass, gypsum 5-15 parts by mass, talcum powder 5-15 parts by mass, glycerin stearate 0-2 parts by mass and additive 4.7-6.7 parts by mass. The application selects green inorganic material, combines the characteristics of slow hydration of low-heat Portland cement, micro-expansion of high-magnesium low-heat Portland cement and micro-expansion of ettringite-like product formed between gypsum and cement hydration product, uses micro-expansion to relieve the shrinkage problem of the material, makes the material form a dense structure, and makes the material have the hydrophobic anti-permeation characteristics through the saponification reaction of glycerin stearate under alkaline conditions.

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.

This CO2-immobilizing expansive material contains an ettringite-forming compound that forms ettringite. The ettringite-forming compound preferably contains free lime as a mineral composition.

The invention relates to the technical field of preparation of foam concrete, in particular to foam concrete based on ettringite micro-expansion effect and a preparation method thereof, and the preparation method comprises the following steps: S1, preparing modified ettringite; s2, dry material premixing; s3, preparing an additive; and S4, concrete forming. The modified ettringite and the modified calcium sulfate have a synergistic effect, so that the bonding strength of an aggregate-matrix interface is remarkably improved, and the early-and-middle-stage compressive strength of a composite system is improved; and meanwhile, the improved pore structure forms a triple action mechanism of'ettringite enhancement-pore optimization-stress buffering ': the ettringite improves the interface bonding and shrinkage compensation capability, the aggregate dissolution space absorbs the volume deformation stress, and the pore structure is optimized to reduce the humidity diffusion gradient, so that strength-shrinkage cooperative control is jointly realized.

The invention provides a cement-based material with a spider silk-like microstructure and a preparation method of the cement-based material, and belongs to the technical field of cement-based materials and preparation of the cement-based materials. The cement-based material comprises the following raw materials: double-component cement, reinforced fibers, mineral whiskers and an additive, the two-component cement comprises silicate cement and sulphoaluminate cement. The expansion effect generated by the hydration reaction of anhydrous calcium sulphoaluminate in the double-component cement not only counteracts the partial shrinkage effect generated by the hydration of Portland cement clinker minerals, but also extrudes the reinforced fibers, so that the binding force between the fibers and a cement matrix is increased. Besides, a secondary frame formed by the generated ettringite raphioid crystals and the added mineral whiskers is combined with a main body frame of the reinforced fibers to form a spider-screen-frame-imitating toughening structure, so that the strength of the material can be improved, and the toughness of the material is also improved.

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 invention provides a compound mineralizer for improving the activity of industrial solid waste. The compound mineralizer comprises microwave activated iron slag, acid-washed carbide slag, nano SiO2 modified slag and a compound activator. The iron slag is activated by microwaves to construct a porous structure, Fe < 3 + > catalyzes and breaks Si-O bonds of a glass body, and meanwhile, the acid pickling carbide slag continuously releases Ca < 2 + > / OH <-> to maintain an alkaline environment with the pH value of 12-13. The dissolved [SiO4] < 4-> and [AlO4] < 5-> are nucleated on the surface of the nano SiO2, fibrous C-S-H gel and needle-like ettringite respectively grow on the surface of the nano SiO2, and a Fe-O-Si bond is formed by the gamma-Fe2O3 interface and C-S-H. When the mineralizing agent is used in cement, the 28-day compressive strength can be improved by 25%-37.5%, the impermeability can be improved by 50%-58.3%, the solid waste activity index reaches 90% or above, and efficient utilization of industrial solid waste in cement is achieved.

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.

This invention discloses a multi-source solid waste-based cementitious material and its preparation method, relating to the technical field of cementitious materials for solidified organic soft soil. The raw materials for the cementitious material include: carbide slag, desulfurization ash, yellow phosphorus slag, highly active and stable steel slag, modified red mud, alkaline slag, desulfurized gypsum, slag, and calcium sulfoaluminate; the highly active and stable steel slag is obtained from liquid steel slag after preliminary stabilization treatment and activation; the steel slag activation is achieved by preparing stabilized steel slag, modified ettringite microparticles, aluminum sulfate, polycarboxylate superplasticizer, hexadecyltriethylammonium bromide, and potassium hydroxide; the modified red mud is prepared from red mud, magnesium hydroxide, N-methyldiethanolamine, desulfurization ash, calcium oxide, and ferric chloride solution; the modified ettringite microparticles are modified with polyvinyl alcohol and N-β-aminoethyl-γ-aminopropyltrimethoxysilane. The multi-source solid waste-based cementitious material of this invention effectively improves the compressive strength and water stability coefficient of solidified organic soft soil.

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 application discloses a coal gangue-based waterproof ceramic tile adhesive and a preparation method thereof, and belongs to the technical field of building materials. Modified fiber material is coated with silicon dioxide, so that the modified fiber material can uniformly block the decarburized coal gangue. The silicon dioxide contained in the structure can make water molecules difficult to penetrate into the structure. When applied in a high-humidity environment, the application can avoid water intrusion to cause aging. The silicon dioxide is beneficial to hydration. The hydration can generate calcium silicate gel and ettringite. The ettringite is a needle-like substance and has swelling property, so that the ettringite can be inserted into the gel as an early reinforcement phase. Meanwhile, ettringite crystals grow along the gap to the gel matrix. The swelling effect can form a channel, so as to guide the modified fiber material to penetrate into the gel, increase the strength of the gel, indirectly anchor the silicon dioxide in the gel to avoid falling off, and improve the moisture resistance.

The application relates to the technical field of shotcrete cement, and discloses a special cement for tunnel shotcrete, which comprises, in percentage by mass, cement clinker 80-85%, slag 6-11%, limestone 2-4%, hard gypsum 5-8% and quick-setting agent 6-9%. The quick-setting agent comprises aluminum sulfate, organic alcohol amine, micro-silica powder and silicic acid, and the mass ratio of the components is 6-7:0.5-0.8:1-2:0.6-1.2:0.1-0.4. The application also discloses the application of the cement to a concrete composite layer and a construction method of the concrete composite layer. The application can adjust the pH value of the system by adding silicic acid, thereby promoting the dissolution and hydration of silicates in the cement clinker, separating out Ca 2+ , thereby increasing the concentration of Ca 2+ in the system, and further promoting the generation of calcium aluminate to strengthen the early strength. Further, the cement component is applied to the concrete composite layer, and the construction can achieve the effects of good impermeability and high strength.

Provided is a method for manufacturing a cured body that has a rapid curing property and that makes it possible to suppress expansion due to delayed generation of ettringite.　The method for manufacturing a cured body comprises: a mixing step for mixing steelmaking slag, a binder containing a blast furnace slag fine powder, and water to form a mixture; and a curing step for curing the mixture. The mixture satisfies relational expression (1).　(1): 2.5 ≤ (the mass of sulfur in terms of SO3 per 1 m3 of the cured body × 100) / (the mass of the blast furnace slag fine powder per 1 m3 of the cured body) ≤ 9.0