113 results about "Aluminite" patented technology

The invention relates to the technical field of filling materials, and particularly discloses an ardealite-based high-strength anti-seepage filling material and a preparation process thereof, the ardealite-based high-strength anti-seepage filling material comprises 50%-65% of pretreated ardealite, 15%-25% of Portland cement, 5%-15% of superfine slag powder, 5%-10% of electrolytic manganese residues, 5%-8% of silica fume, 3%-6% of metakaolin, 2%-4% of a composite alkali activator and 0.5%-1.2% of a polycarboxylic acid water reducer, 0.3%-0.8% of an organic silicon water repellent and 0.05%-0.1% of cellulose ether; according to the invention, through chemical reaction of Mn < 2 + > in the electrolytic manganese residue and SO4 < 2-> in the phosphogypsum, micron-sized manganite crystals (MnAl2 (SO4) 4. 22H2O) are generated to actively fill internal micro-cracks of the material, so that a filling body is endowed with a self-repairing function and the impermeability is improved, and a composite alkali activator composed of NaOH and water glass is used for synergistically activating potential gelling activity of the superfine slag powder and the silica fume, so that the self-repairing filling material is prepared. And the formation of hydration products is accelerated, and 0.3-0.5 T of pulsed magnetic field is applied in the stirring process, so that the manganite crystals are guided to orderly grow along the expected stress direction of the filling body, and the compressive strength is improved.

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 relates to the technical field of building materials, in particular to a cementing material for a fabricated wall prepared from multi-element solid waste and a preparation method of the cementing material. The preparation method comprises the following steps: 25-55 parts of fly ash, 25-65 parts of blast furnace slag, 8-10 parts of lime, 1-5 parts of desulfurized gypsum, 3-6 parts of a first mixture, 2-5 parts of a second mixture and 5-8 parts of an alkali activator; the mass ratio of the metakaolin to the bentonite to the superfine calcium carbonate in the first mixture is 3: 2: 1; the mass ratio of the vermiculite to the expanded perlite to the glass beads in the second mixture is 2: 2: 1. Through the synergistic excitation effect of Ca < 2 + > and Na < + > and the addition of the first mixture and the second mixture, the cementing material forms a more stable microstructure. A hydration product SEM figure shows that C-S-H and C (N)-A-S-H gel are symbiotic to form a three-dimensional network, pores are filled with needle-like ettringite crystals, and in combination with the brucite phase anchoring effect, the mechanical properties, such as strength and durability, of the material are remarkably improved.

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 relates to the technical field of shield tunnel construction, and discloses a shield tunnel segment joint waterproof material and a waterproof structure, the shield tunnel segment joint waterproof material comprises a component A and a component B; the component A comprises the following component: 30-40 parts of liquid polysulfide rubber; 5 to 10 parts of a fluorinated polyurethane prepolymer; 1-5 parts of a silane coupling agent; 3-5 parts of fumed silica; 8-15 parts of hollow glass beads; 10 to 15 parts of nano calcium carbonate; 0.5 to 2 parts of polytetrafluoroethylene micro powder; 0.1 to 1 part of ettringite; the component B comprises the following component: 1-5 parts of manganese dioxide; and 5 to 10 parts of dioctyl phthalate. By utilizing the characteristics that the sealing gasket has excellent fluidity during injection and can be automatically cured into a high elastomer within a set time, a pre-installed sealing gasket can be replaced by adopting an innovative injection process, and the construction difficulty faced by high-precision shield segment assembly in a high-water-pressure environment is effectively solved.

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 mixed gels, in particular to a preparation method and application of a composite solid waste-based cementing material, and the preparation method comprises the following steps: grinding dried granulated blast-furnace slag, steel slag, fly ash, iron tailings, phosphogypsum and Portland cement, mixing to obtain a pretreated powder raw material, adding a modified activator into the pretreated powder raw material, and uniformly mixing to obtain the composite solid waste-based cementing material. And stirring to obtain the composite solid waste-based cementing material. The synergistic effect of the alkaline activator and the sulfate activator is matched with the nucleation induction effect of the mineral modified admixture, so that hydration process synchronization of multiple solid waste components is realized, sulfate, Ca < 2 + > and an aluminum phase quickly generate ettringite, the mineral admixture is used as a crystal nucleus for growth of a hydration product, the hydration induction period is greatly shortened, and the hydration efficiency is improved. The early strength development rate of the material is increased, the later strength is continuously increased without shrinkage, and the engineering pain point of insufficient early strength or later strength stagnation of a traditional solid waste-based material is solved.

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 present invention provides an alkali-free, fluorine-free, and chlorine-free rapid-setting and early-strength component, which includes an A component and a B component, wherein the mass ratio of the A and B components is 1:(1-2); the A component includes the following raw materials in mass parts: 4-5 parts of aluminum sulfate 18hydrate and 4-5 parts of water; the B component includes the following raw materials in mass parts: 1-2 parts of nanomaterials and 12-13 parts of water; the nanomaterial is a mixture of nano-ettringite and any one of nano-silicon dioxide, nano-aluminum dioxide, nano-titanium dioxide, and nano-hydrated calcium silicate; the content of nano-ettringite in the nanomaterial is not less than 70%. The nano-ettringite in the rapid-setting and early-strength component used in the present application has good dispersibility and does not require an additional dispersant; does not contain fluorine ions, thereby reducing harm to the human body; does not contain chloride ions, thereby effectively avoiding the corrosion harm of chloride ions to steel bars; does not contain sodium and potassium ions, truly achieving alkali-free rapid setting and avoiding strength shrinkage and durability problems in the later stage.

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 application relates to the technical field of building materials, in particular to a cementing material for preparing an assembled wall body from multiple solid wastes and a preparation method; the cementing material is prepared from 25-55 parts of fly ash, 25-65 parts of blast furnace slag, 8-10 parts of lime, 1-5 parts of desulfurization gypsum, 3-6 parts of a first mixture, 2-5 parts of a second mixture and 5-8 parts of an alkali activator; the mass ratio of metakaolin, bentonite and superfine calcium carbonate in the first mixture is 3:2:1; the mass ratio of vermiculite, expanded perlite and glass beads in the second mixture is 2:2:1. The cementing material has a more stable microstructure through the synergistic activation of Ca and Na, and the addition of the first mixture and the second mixture. 2+ and Na + The C-S-H and C(N)-A-S-H gels form a three-dimensional network, needle-shaped ettringite crystals fill pores, and the anchoring effect of brucite phase is combined, so that the mechanical properties, such as strength and durability, of the material are significantly improved.

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.

A construction composition comprises a) a cementitious binder comprising one or more calcium silicate mineral phases and one or more calcium aluminate mineral phases; b) optionally, an extraneous aluminate source; c) a sulfate source; d) an ettringite formation controller comprising (i) glyoxylic acid, a glyoxylic acid salt and / or a glyoxylic acid derivative; and (ii) at least one of a borate source and a carbonate source; and e) a polyol in an amount of 0.2 to 2.5 wt.-%, relative to the amount of cementitious binder a). The composition contains 0.05 to 0.2 mol of total available aluminate, calculated as Al(OH)4−, from the calcium aluminate mineral phases plus the optional extraneous aluminate source, per 100 g of cementitious binder a); and the molar ratio of total available aluminate to sulfate is 0.4 to 2.0. The construction composition exhibits high early strength and sufficient open time.

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 application discloses a kind of heavy metal wastewater continuous treatment methods rich in sulfate, belong to environmental management technical field.The method relies on adjusting tank, reaction tank, oxidation tank, sedimentation tank, transfer tank and filter press equipment, and uses calcium aluminate crystal lattice solidification method to treat wastewater: first, wastewater pH is adjusted to 7.0~8.0 by alkaline compound, then calcium source heavy metal removal agent A, oxidizing agent heavy metal removal agent B and aluminum source heavy metal removal agent C are added respectively, the pH of wastewater after reaction is controlled to 9.0~11.0, and the solid-liquid separation is carried out by filter pressing after 0.5h~1.5h continuous reaction.The method permanently fixes heavy metal ions in calcium aluminate crystal lattice through ion exchange, solves the problems of low efficiency, secondary pollution of sulfide and large amount of hazardous waste sludge in traditional chemical precipitation method, and realizes continuous and cooperative deep removal of sulfate and heavy metals.The filtrate meets the discharge standard, and the filter residue has no leaching toxicity, which can be used as foundation cushion and mine soil covering for secondary utilization.The method is efficient, low in cost, and suitable for industrial continuous treatment.

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 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.

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.

The application belongs to the technical field of quick-setting agent preparation, and particularly relates to a production process for preparing a powdery quick-setting agent master batch from aluminum ash and aluminum slag; the production process for preparing the powdery quick-setting agent master batch from the aluminum ash and the aluminum slag comprises the following steps: hazardous waste pretreatment and aluminum particle separation and recovery, ingredient mixing and clinker preparation by calcination, clinker grinding and finished product packaging, and dust removal ash intelligent closed-loop recycling control; the composite activator added in the application can effectively adsorb and fix the chloride ions in the dust removal ash, smooth the fluctuations in the content of Al2O3 in the dust removal ash, induce the early and rapid generation of needle bar-shaped ettringite crystals in the cement paste, significantly shorten the initial setting and final setting times, improve the early mechanical strength, and effectively avoid the late strength reduction; the dust removal ash intelligent closed-loop recycling control step is combined with the composite activator, the recycling ratio is intelligently adjusted through online detection, the ingredient system component is accurately controlled, and the quality of the quick-setting agent master batch product is uniform and stable.