108results about How to "Improve volume stability" patented technology

The invention discloses a solid waste-based cold-mixed asphalt mixture for preventive maintenance as well as a preparation method and application thereof, and belongs to the technical field of road engineering. The solid waste-based cold-mixed asphalt mixture is prepared from the following components in percentage by mass: 4.7 to 8.6 percent of modified cold-mixed asphalt adhesive, 85.8 to 93.9 percent of aggregate and 1.4 to 5.6 percent of composite filler, the modified cold-mixed asphalt adhesive is prepared from the following components in parts by weight: 86 to 96 parts of emulsified asphalt, 1 to 5 parts of bisphenol A type waterborne epoxy resin emulsion, 0.05 to 1 part of curing agent, 0.01 to 0.05 part of defoaming agent, 1.5 to 8 parts of waterborne polyurethane emulsion and 1 to 3 parts of hydroxypropyl methyl cellulose. The solid-waste-based cold-mixed asphalt mixture prepared by the method shows excellent comprehensive performance in high-temperature rut resistance, water damage resistance, freeze-thaw resistance, skid resistance, volume stability, interlayer shear resistance and the like, promotes reasonable utilization of solid waste resources, and has good economic and environmental benefits.

The invention relates to a preparation method of an irradiation-resistant and accident-resistant SiC / SiC nuclear fuel cladding. The preparation method comprises the following steps: (1) alternately carrying out the following step (A) and step (B) from step (A) to step (A) to obtain a tubular SiC fiber preform with at least two PyC interface layers and at least one SiC nanowire interface layer: (A) depositing the PyC interface layers on the surface of the tubular SiC fiber preform through a chemical vapor deposition process; (B) loading a catalyst on the PyC interface layer through vacuum impregnation, and generating a SiC nanowire interface layer on the surface of the PyC interface layer in situ through a chemical vapor deposition process; (2) carrying out densification treatment on the tubular SiC fiber preform by adopting a chemical vapor infiltration process; and (3) depositing a SiC coating on the surface of the tubular SiC fiber preform by adopting a chemical vapor deposition process to obtain the SiC / SiC nuclear fuel cladding tube.

The invention provides novel waterproof phase change thermal insulation mortar and a preparation method thereof, and relates to the technical field of mortar building materials, the novel waterproof phase change thermal insulation mortar is prepared from the following raw materials by weight: 500 parts of ordinary Portland cement, 150 parts of water, 250-450 parts of fine sand, 50-200 parts of a shape-stabilized phase change material, 5-15 parts of a polycarboxylic acid water reducer, and 1-5 parts of polysorbate. The diatomite is treated by adopting a three-step method of calcination, acid pickling and hydrophobic modification, so that on the basis of reducing impurities and increasing the pore volume, the diatomite is modified from hydrophilicity to hydrophobicity and lipophilicity, the adsorption capacity of the diatomite to n-hexadecane is further enhanced, and the enthalpy and volume stability of the shape-stabilized phase change material can be remarkably improved.

The invention belongs to the technical field of building materials, and particularly relates to magnesium oxychloride cement mortar containing polyaluminum chloride water purifier waste residues as well as a preparation method and application of the magnesium oxychloride cement mortar. The magnesium oxychloride cement mortar containing the polyaluminum chloride water purifying agent waste residues is prepared from the following components in parts by mass: 45 to 55 parts of magnesium oxychloride cement and gypsum, 100 to 150 parts of the polyaluminum chloride water purifying agent waste residues, 0 to 3.6 parts of citric acid, 0 to 14 parts of styrene-acrylic emulsion, 130 to 170 parts of river sand and 160 to 200 parts of water, the magnesium oxychloride cement is prepared from 480 to 520 parts of magnesium oxide and 190 to 320 parts of magnesium chloride hexahydrate. The magnesium oxychloride cement mortar containing the polyaluminum chloride water purifying agent waste residues can be used as a cement-based pavement patching material, a large amount of polyaluminum chloride water purifying agent waste residues can be consumed, the problem of environmental pollution caused by the waste residues is effectively solved, the water resistance of the magnesium oxychloride cement mortar can be effectively improved, and efficient resource utilization of industrial solid waste is achieved.

The invention relates to the field of concrete, and particularly discloses self-compacting concrete and a preparation method thereof. The self-compacting concrete comprises the following raw materials in parts by weight: 320-370 parts of cement; 800 to 840 parts of coarse aggregate; 750 to 780 parts of fine aggregate; 12 to 19 parts of a fiber composition; 55 to 70 parts of fly ash; 20-35 parts of steel slag powder; 1-3 parts of a water reducing agent; 140 to 175 parts of water; 8-14 parts of an expanding agent; the fiber composition is hybrid fibers of steel fibers and sisal fibers, and the weight ratio of the steel fibers to the sisal fibers is (9-13): (3-6). The self-compacting concrete has the effects of inhibiting self-constriction and plastic constriction of the self-compacting concrete, reducing generation of harmful cracks and improving the strength and impermeability of the self-compacting concrete.

The invention provides a composite mineral admixture based on iron ore tailing mud and a preparation method thereof, and the composite mineral admixture comprises the following raw materials by weight: 30-40 parts of activated iron ore tailing mud, 5-10 parts of layered ultrafine powder, 5-10 parts of a methacrylic acid-cellulose copolymer, 5-7 parts of limestone powder, 1-3 parts of a composite grinding aid, and 1-3 parts of a composite activator. According to the composite mineral admixture disclosed by the invention, the mixing amount of the composite mineral admixture in cement can be increased to the maximum extent, the use amount of cement clinker is reduced, the production cost of the cement is reduced, the composite cement has more excellent mechanical properties, volume stability and durability, and the composite mineral admixture plays a role similar to a crystal nucleus effect in a cement hydration process; and meanwhile, the hydration products tend to be uniformly distributed in the whole interface transition area, the hydration products with better stability are generated, and the anti-permeability performance is improved.

The invention provides refractory concrete and a preparation method thereof, and belongs to the technical field of concrete. The preparation method comprises the following steps: modifying basalt fiber, modifying granite stone powder, grafting and mixing. The step of modifying the granite stone powder comprises the following steps: putting the granite stone powder into an ethanol solution, adding sorbitol laurate and polyoxyethylene sorbitan monolaurate, stirring at the stirring temperature of 46-50 DEG C, uniformly stirring, adding threonine, carrying out ball milling treatment for 26-30 minutes at the ball milling rotating speed of 114-125rpm according to the ball-to-material ratio of (3-5): 1, and after the ball milling is finished, cooling to room temperature to obtain the modified granite stone powder. Filtering and drying to obtain modified granite stone powder; the particle size of the granite stone powder is 135 to 145 nm; the mass concentration of the ethanol solution is 45-50%; the mass ratio of the granite stone powder to the ethanol solution to the sorbitol laurate to the polyoxyethylene sorbitan monolaurate to the threonine is (8.3 to 8.7) to (90 to 97) to (1.0 to 1.2) to (1.1 to 1.5) to (4.5 to 4.9); the prepared refractory concrete is high in strength, excellent in water permeability resistance, good in high-temperature corrosion resistance and low in linear shrinkage rate.

The invention provides a concrete water reducing agent and a preparation method thereof, and belongs to the technical field of water reducing agents. Adding the modified chitin, 1-vinyl-3-butylimidazolium trifluoromethanesulfonate, a silane coupling agent with double bonds, methacrylic acid, trans-butenedioic acid and an initiator into dimethylformamide, heating and stirring for reaction, removing methylbenzene under reduced pressure, and performing alkali washing and alcohol washing to obtain the concrete water reducing agent. The modified chitin is prepared by modifying chitin modified by sodium sulfonate and acrylic acid with tannic acid. Modified chitin, 1-vinyl-3-butylimidazolium trifluoromethanesulfonate, a silane coupling agent with double bonds, methacrylic acid and trans-butenedioic acid are copolymerized to prepare the polycarboxylate superplasticizer, molecules of the polycarboxylate superplasticizer are of a comb-shaped structure, a main chain of the polycarboxylate superplasticizer is provided with a plurality of active groups with high polarity, and a side chain of the polycarboxylate superplasticizer is provided with hydrophilic active groups. The water-reducing agent has the characteristics of low doping amount, high water-reducing rate, high reinforcing effect, high plasticity retaining property and volume stability, and has wide application prospects.

The invention discloses a preparation method and a use method of bleeding inhibition microspheres for concrete. The preparation method of the bleeding inhibition microspheres for the concrete comprises the following steps: (1) performing ultrasonic dispersion on alkali-soluble polyester fibers, lauryl sodium sulfate and water to obtain a mixed solution A; (2) dissolving high-modulus sodium silicate in water, adding the steel slag micro powder, and uniformly stirring to form a turbid liquid B; (3) mixing the mixed solution A, the turbid liquid B and sodium alginate to form a mixed solution D; (4) reacting the mixed solution D with an excessive calcium nitrate solution, and filtering to obtain gel microspheres; (5) adding excessive sodium citrate solution into the gel microspheres, dissolving and filtering to obtain particles; and (6) reacting the particulate matters with a sodium hydroxide solution, and filtering to obtain the bleeding inhibition microspheres. When the bleeding inhibition microspheres are added into concrete, bleeding of the concrete can be obviously reduced, the fluidity and cohesiveness of a concrete mixture are improved, and the mechanical property and the volume stability of the concrete are improved.

The invention relates to the technical field of dredged soil curing agents, in particular to a dredged soil pneumatic mixed flow curing agent and a preparation method thereof. The dredged soil pneumatic mixed flow curing agent is prepared from the following raw materials in parts by weight: 20 to 50 parts of cement, 10 to 40 parts of fly ash, 10 to 40 parts of mineral powder, 20 to 50 parts of quick lime, 0.01 to 0.1 part of retarder, 0.01 to 0.05 part of flocculant, 0.005 to 0.01 part of silane coupling agent and 0.1 to 0.3 part of hydrophobic adsorption type admixture. The hydrophobic adsorption type admixture, the silane coupling agent and the flocculating agent are doped into the curing agent raw materials at the same time and have a synergistic enhancement effect, so that the cohesiveness and the pumpability of curing agent slurry can be remarkably improved, the adaptability of the curing agent slurry and dredged soil in a pneumatic mixed flow process can be enhanced, the sensitivity to the water content of the dredged soil is reduced, and the curing agent has the advantages of being simple in preparation process and low in cost. The solidified soil is relatively stable in later-stage reinforcement, the solidifying agent is used in dredged soil pneumatic mixed-flow solidification production, the pumping constructability, the dispersion resistance in water and the hardening performance of the solidified soil can be remarkably improved, and the solidifying agent is suitable for filling projects such as sea reclamation and backfilling.

The invention belongs to the technical field of building material production, and particularly relates to a method for manufacturing recycled concrete by using building solid waste and unfired lightweight aggregate waste, which comprises the following specific steps: step 1, collecting the solid waste generated by building, sorting impurities in the building solid waste through magnetic separation and impurity sorting, and recycling the impurities in the building solid waste; when the building solid waste and the unfired lightweight aggregate are processed into blocks, the blocks are poured into the negative pressure bin to be reinforced, so that the hardness is higher, in the later use process, the pressure resistance and the tension resistance are higher, in the preparation process, the anti-freezing water reducing agent, the regulator, the corrosion inhibitor and the expanding agent are added, and the anti-freezing effect is better. The flowability and pumpability of the concrete can be improved, so that the construction efficiency and quality are improved, the durability of the concrete is enhanced, the chemical corrosion and physical damage resistance of the concrete is improved, and the density, color and volume stability of the concrete can be adjusted to meet the requirements of specific engineering.

The invention discloses low-shrinkage ultra-high performance concrete and a preparation method thereof, and belongs to the technical field of concrete. The shrinkage ultra-high performance concrete is prepared from the following components in parts by mass: 100 parts of cement, 25 to 100 parts of mineral admixture, 2.1 to 3.5 parts of high-performance water reducing agent, 5 to 10 parts of expanding agent, 0.12 to 0.2 part of thickening time control agent, 2.5 to 4 parts of reinforcing agent, 100 to 160 parts of sand, 1.5 to 3 parts of fiber and 18 to 30 parts of water, the mineral admixture is a product obtained by cofiring the high-aluminum solid waste and CaO at 800-900 DEG C and then carrying out shock cooling treatment. The low-shrinkage ultra-high-performance concrete has excellent compressive strength and tensile property, meanwhile, a large proportion of high-aluminum solid waste replaces part of cement and all silica fume in existing ultra-high-performance concrete, large chemical shrinkage caused by the cement and the silica fume in the hydration reaction process is greatly reduced, and the volume stability of a matrix is improved. A large amount of solid hazardous waste with high aluminum oxide content is used, so that the production and construction cost is reduced, and meanwhile, a method for comprehensively utilizing solid hazardous waste resources is provided.

The invention belongs to the technical field of building materials, and particularly relates to all-solid-waste fluid-state solidified soil and a preparation method thereof. The all-solid-waste fluid-state solidified soil is prepared from the following components in parts by weight: 25 to 45 parts of modified red mud, 25 to 45 parts of modified diatomite, 10 to 30 parts of desulfurized gypsum, 90 to 110 parts of iron tailing slag, 35 to 55 parts of clay, 0.01 to 1 part of hyperdispersant, 0.01 to 2 parts of expanding agent, 0.01 to 0.5 part of internal curing agent and 75 to 125 parts of water. The all-solid-waste fluid-state solidified soil provided by the invention has the advantages of good fluidity, high strength, good volume stability, low cost and the like, and is suitable for various projects such as foundation backfilling, site leveling and the like.

The invention relates to a super-early-strength ultra-high-performance potassium magnesium phosphate cement-based composite material and a preparation method thereof.The super-early-strength ultra-high-performance potassium magnesium phosphate cement-based composite material (UHPMKPCC) takes dead burned magnesium oxide and monopotassium phosphate as cement raw materials, takes silica fume as one of cementing materials, and takes calcium carbonate as one of the cementing materials; wollastonite powder, metakaolin, fly ash, sodium dihydrogen phosphate and the like are used as auxiliary cementing materials, quartz sand is used as aggregate, and a composite retarder and a water reducing agent are adopted to jointly realize preparation and application of the UHPMKPCC with the ultra-low water-binder ratio. Compared with the existing ultra-high performance Portland cement-based material (UHPC) technology, the UHPMKPCC disclosed by the invention has the advantages of remarkable ultra-early strength mechanical property, low drying shrinkage and the like; compared with an existing ultrahigh-performance magnesium ammonium phosphate cement-based material technology, the UHPMKPCC has the advantages that the setting time can be effectively regulated and controlled, and no ammonia gas is released. The method can be applied to safe solidification treatment of radioactive nuclear waste in the fields of first-aid repair, rush building and reinforcement in the civil engineering field and safe treatment of nuclear waste.

The invention relates to the technical field of building materials, and particularly discloses high-strength premixed pervious concrete for a surface layer and a preparation method of the high-strength premixed pervious concrete. The invention relates to high-strength premixed pervious concrete for a surface layer. The concrete comprises the following components in parts by weight: 220 to 300 parts of cement, 1570 to 1720 parts of double-graded broken stone, 85 to 120 parts of water, 50 to 100 parts of mineral powder, 18 to 35 parts of anhydrite, 4 to 10 parts of soluble sulfate, 0 to 50 parts of silica fume, 0 to 50 parts of fly ash of 1000 meshes, 20 to 35 parts of quartz stone fine sand of 80 to 120 meshes, 1 to 2.5 parts of a composite water reducing agent, 0.4 to 2.4 parts of a viscosity modifier, 6 to 10 parts of wollastonite fiber powder and 0.4 to 1 part of a defoaming agent. The composite water reducing agent comprises an ether polycarboxylic acid water reducing agent and an ester polycarboxylic acid water reducing agent. The composition and proportion of the concrete are designed and adjusted, so that the concrete has a good construction effect under the premixing condition.

The invention relates to the technical field of concrete pavement repairing, and particularly discloses a repairing method for rapid construction of a concrete pavement. A repairing method for rapid construction of a concrete pavement comprises the following steps that S1, pit hole pretreatment is conducted, specifically, sundries in a pit hole are cleaned up, a grouting material and water are evenly mixed to obtain repairing slurry, and the inner surface of the pit hole is coated with the repairing slurry; s2, primary repairing is conducted, specifically, broken stones are filled into the pit hole to the structural depth 0.5-1.0 cm away from the road surface, the broken stones are spread and leveled, and repairing slurry is injected into the pit hole to the structural depth 1.0-2.0 cm away from the road surface; and S3, secondary repairing: after the repairing slurry poured in the step S2 is initially set, sand grains are mixed with the repairing slurry, the pits are filled to be flush with the road surface, and maintenance treatment is performed after initial setting. The repairing method is simple and easy to construct, construction tools are simple and easy to carry, manpower, working hours and cost can be greatly saved, and the rapid repairing effect is achieved.

The invention belongs to the technical field of concrete, and particularly relates to high-specific-gravity self-compacting concrete and a preparation method thereof. The high-specific-gravity self-compacting concrete is prepared from the following raw materials in parts by mass: 560 to 671 parts of natural coarse aggregate, 725 to 906 parts of iron ore, 300 parts of natural fine aggregate, 446 parts of steel slag sand, 383 parts of cement, 0 to 54 parts of steel slag powder, 107 parts of fly ash, 2.6 to 13.6 parts of water reducing agent and 150 to 182 parts of water. The performance of the concrete is greatly improved by improving the microcosmic performance of the concrete and grading of all the components, and the purposes of reducing the use amount of cement, reducing shrinkage and creep of the concrete, reducing CO2 emission, saving energy, protecting the environment and achieving green construction are achieved while high specific gravity, self-compaction and high strength of the concrete are achieved.

The invention relates to the technical field of gypsum, and discloses a slope protection material based on building beta gypsum as well as a preparation method and a construction method thereof, the slope protection material comprises 40-55 parts of building beta gypsum, 8-15 parts of phosphogypsum, 2-5 parts of a curing agent, 10-20 parts of fly ash and 40-60 parts of water; the curing agent comprises calcium hydroxide, potassium carbonate, acrylic resin and calcium carbonate. After the slope protection material provided by the invention is cured, the leachate of the slope protection material reaches the first-grade discharge water standard through a vibroflotation water method. The innovation ensures the environmental protection property of the material in the application process, solves the problem of low water stability of the traditional beta gypsum, increases the water softening coefficient of the building beta gypsum to 0.7, solves the influence on the environment in the treatment process, and meets the requirements of green construction and sustainable development.

The invention belongs to the technical field of building materials, and particularly relates to a low-carbon cementing material for preparing a high-speed roadbed and a preparation method of the low-carbon cementing material. The main component mineral powder of the cementing material is subjected to amination treatment, the fly ash is subjected to sulfhydrylation treatment, and the modified gypsum and the citric acid carbon quantum dot doped red mud are introduced, so that the high-speed roadbed low-carbon cementing material is prepared, it is guaranteed that the cementing material has proper final setting time, and the compressive strength and the breaking strength are effectively improved.

The present invention discloses a silicon-based negative electrode active material and a lithium battery silicon negative electrode sheet, wherein the silicon-based negative electrode active material uses nano silicon as a substrate, and an aminosilane coupling agent and a sulfonated polyimide are sequentially coated on the outside of the substrate. The present invention proposes a silicon-based negative electrode active material and a lithium battery silicon negative electrode sheet, which effectively suppress the expansion and pulverization effect of nano silicon by sequentially coating the surface of nano silicon with an aminosilane coupling agent and a sulfonated polyimide, so that the silicon-based negative electrode active material has both a high first coulomb efficiency and good cycle stability.

The application discloses a method for preparing a carbon fixation material from magnesium slag, and the carbon fixation material, and belongs to the technical field of solid waste resource utilization. The method comprises the following steps: mixing magnesium slag and calcareous raw materials to obtain a compound material, wherein the molar ratio of calcium to silicon in the compound material is (2.3-2.7):1; forming the compound material into a green body; preheating the green body at 200-600 DEG C, calcining the green body by increasing the temperature to 1150-1450 DEG C, and cooling the green body by decreasing the temperature to 400-600 DEG C, thereby obtaining the carbon fixation material. The method can reduce the content of beta-C2S in the magnesium slag, increase the content of gamma-C2S, effectively stabilize heavy metal ions, and reduce the generation of volatile gases such as ammonia, thereby significantly improving the long-term stability and environmental safety of the material on the basis of ensuring the carbonation reaction activity.

The application belongs to the technical field of refractory materials, and relates to a multi-metal composite magnesium-alumina spinel-containing refractory material and a preparation method thereof. The material of the magnesium-alumina spinel-containing refractory material is one of SiC-MgAl2O4, Al2O3-MgAl2O4 and MgO-MgAl2O4; the main body of components of the magnesium-alumina spinel-containing refractory material is granular SiC, Al2O3 and MgO as aggregate and a mixture of fine powder and micro powder composed of MgAl2O4 as matrix, and the components contain metal Al and Al-Mg alloy; the magnesium-alumina spinel-containing refractory material is prepared through hot air drying at 150-200 DEG C for 8-24 hours, and high-temperature sintering is not needed; the magnesium-alumina spinel-containing refractory material is a composite refractory material with alpha-SiC or corundum or periclase as main crystal phase and magnesium-alumina spinel as secondary crystal phase. The application realizes that the formed green body only needs to be treated at low temperature not higher than 200 DEG C, and can meet good mechanical properties, structural stability and corrosion resistance in a use temperature range of 25-1600 DEG C, and the built-in hot work thermal reserve can realize high mechanical strength and volume stability from normal temperature to the highest use environment through the waste heat in the oven heating process.

The invention relates to the technical field of concrete preparation, and particularly discloses mass concrete and a preparation method thereof. The concrete is prepared from the following raw materials in parts by weight: 330-450 parts of cement, 430-510 parts of fine aggregate, 1000-1200 parts of coarse aggregate, 3-9 parts of a viscosity reducer, 3-10 parts of an additive, 50-100 parts of fly ash and 5-15 parts of an MXene composite phase change material. By introducing the MXene composite phase change material, the internal and external temperature difference and the temperature peak value caused by heat release of hydration reaction of mass concrete before and in the middle period of curing are effectively reduced, so that the generation of temperature cracks is inhibited. In addition, the concrete effectively relieves temperature stress caused by uneven temperature distribution in a large-temperature-difference environment, and the volume stability of the structure is improved. The concrete has excellent working performance, weather resistance and construction performance, high early strength and stable performance.

The utility model discloses a rock-fill concrete oversized test piece processing device which comprises a bin chamber, a pipe A and a cutting machine, a material piece is arranged in the bin chamber, the pipe A is arranged in the bin chamber, and the cutting machine is arranged on the material piece. The test piece block manufactured by the utility model is consistent with a prototype and can reflect actual conditions; the efficiency is improved; the process is simple, human intervention is small, and quality is easy to guarantee; meanwhile, due to the framework action of the rockfill body, the volume stability is good, and the quality of a large test piece cut, processed and formed by a rope saw is easier to guarantee; therefore, the preparation method disclosed by the utility model can be well suitable for forming the large test piece block of the rock-fill concrete.

This invention belongs to the field of cement materials technology, specifically disclosing a fast-setting silica-alumina phosphate cement and its preparation method. The cement includes main components and functional regulating components. The main components are 50%-70% silica-alumina raw materials, 20%-30% heterocyclic organophosphate activating raw materials, and 10%-20% modified silicate calcium raw materials. The functional regulating components include heterocyclic solvents, metal chelate polymerization accelerators, and polyhydroxy coordination early-strength agents. The functional regulating components are added additionally based on the total mass of the silica-alumina raw materials and modified silicate calcium raw materials as 100%. This invention achieves rapid setting and hardening at room temperature through the synergistic effect of the heterocyclic organophosphate activator and the functional regulating components, eliminating the need for high-temperature curing. It exhibits excellent early strength and long-term stability. The raw materials can utilize various industrial solid wastes, making it environmentally friendly and economical. It is suitable for emergency repairs, rapid construction, and low-temperature environments.

The present invention relates to a piston and a preparation method thereof, wherein a piston comprises a piston head and a piston skirt located below the piston head, characterized in that: a first convex portion and a first groove for limiting the upward and downward movement of the piston head and the piston skirt are matched between the butt surfaces of the piston head and the piston skirt, the end of the first convex portion has a laterally extending tooth portion, the first groove has a tooth groove matching the tooth portion at the position corresponding to the tooth portion, and the piston head is installed on the piston skirt by the limiting cooperation of the first convex portion and the first groove. In this way, the connection between the piston head and the piston skirt is more firm, avoiding the problem of piston failure caused by bolt connection in the prior art; the preparation method of the piston is simple, and the manufacturing cost is reduced.

This application discloses a micro-expansion low-heat silicate cement-based concrete material, its preparation method, and its application, belonging to the field of concrete engineering technology. Each cubic meter of micro-expansion low-heat silicate cement-based concrete material comprises 78-92 kg of water, 82-161 kg of micro-expansion low-heat silicate cement, 28-105 kg of fly ash, 476-608 kg of sand, and 1286-1696 kg of aggregate. The dosage of naphthalene-based water-reducing agent is 0.4 wt%-0.6 wt%, and the dosage of air-entraining agent is 0.014 wt%-0.018 wt%. The air content of the concrete material in the mixed state is 4%-5%, and the slump is 35-50 mm. Through the synergistic proportioning of water, micro-expansion low-heat silicate cement, fly ash, sand, and aggregate, the low heat of hydration and micro-expansion characteristics of micro-expansion low-heat silicate cement are fully utilized.

The present invention discloses a light and high-strength layered refractory material and a preparation method thereof, and belongs to the technical field of refractory materials. The refractory material is composed of several layers of thin layer units with different porosities and different thicknesses, and the thin layer units are one or both of a dense layer and a porous layer. The preparation method of the refractory material comprises the preparation of a dense layer slurry, the preparation of a porous layer slurry, and pouring the slurry layer by layer according to the structural composition of the refractory material. After the gelation reaction is completed, the green body is dried and sintered to obtain a light and high-strength layered refractory material. The refractory material of the present invention is prepared by gel casting technology, which is simple and efficient to operate, can realize large-scale production of layered refractory materials with specific needs, and is convenient for promotion and application. At the same time, the density of the refractory material prepared by the present invention is 0.32-1.23 g / cm 2 , with a strength of 10‑87 MPa, and is used as an integrated composite refractory material for the thermal insulation lining and working lining of industrial furnaces.

The present application relates to a kind of converter tapping hole repair material and preparation method, including repair layer, glaze layer, the repair layer is composed of the following raw materials: pretreated high-purity magnesia, carboxymethyl cellulose, binder;The pretreatment of high-purity magnesia: high-purity magnesia is soaked in magnesium sulfate heptahydrate aqueous solution for 24 hours or more, take out and dry at 100~110 ℃ temperature;Glaze layer is composed of the following raw materials: glass powder, potassium feldspar powder, quartz powder, SiC fine powder, chromium oxide green, water.The advantage is: converter tapping hole repair material according to the need characteristics of use position and steel plant, use high-purity magnesia soaked in magnesium sulfate heptahydrate aqueous solution as main raw material, improve the disintegration of material, shorten the replacement tapping hole time.Repair layer disintegration is excellent, the added carboxymethyl cellulose or clay and binder effectively improve the volume stability of repair agent at high temperature.

This application relates to the field of building materials technology and discloses a low-cost micro-expansion ultra-high performance concrete and its preparation method. The raw materials of the concrete include water, cement, silica fume, limestone powder, fine aggregate, coarse aggregate, polycarboxylate superplasticizer, CaO-calcium sulfoaluminate-based composite expansion agent, and sodium polyacrylate-based internal curing agent. The fine aggregate is river sand, and the coarse aggregate is basalt crushed stone. During preparation, the powders are first mixed dry, then an aqueous solution of the superplasticizer is added and stirred into a uniform slurry. The aggregate is then added, stirred, and finally molded and cured. This invention utilizes the internal curing agent to desorb moisture when the internal humidity of the concrete matrix decreases, providing moisture compensation for the later hydration of the composite expansion agent, causing the dense matrix to undergo micro-expansion deformation and convert it into self-stress. This solution effectively compensates for the volume shrinkage caused by the low water-cement ratio, reducing the risk of cracking. Simultaneously, the use of conventional sand and gravel instead of pure quartz sand significantly reduces the cost of large-scale preparation.