435 results about "Calcium aluminates" patented technology

The invention provides a concrete super-early-strength quick-hardening material, and relates to the field of building materials. The high-strength concrete comprises the following components in percentage by mass: 40%-50% of calcium aluminate, 30%-40% of gypsum, 8%-15% of high aluminum, 1%-3% of an additive, 3%-12% of an exciting agent and 1%-5% of an auxiliary material. According to the super-early-strength quick-hardening material provided by the invention, hour-level strength can be quickly and stably improved, and the strength increasing curve of each age is smooth and stable, so that the requirements of scenes such as road repair and tunnel construction on early strength can be met; it can be guaranteed that the 28-day compressive strength of the material breaks through 70 MPa, the later strength is kept stable, and the long-term safety of an engineering structure is guaranteed; the anti-seepage, anti-freezing and anti-erosion capabilities are realized in a complex environment, the service life of a project can be effectively prolonged, and the maintenance cost is reduced. In addition, the invention further provides a preparation method of the concrete super-early-strength and quick-hardening material, and the preparation method is used for preparing the super-early-strength and quick-hardening material provided by the invention.

The invention discloses fiber reinforced concrete for bridge deck pavement and a preparation method thereof, and belongs to the technical field of concrete. The fiber reinforced concrete is prepared from the following raw materials: Portland cement, modified basalt fiber, a slow-release mineralizer, a stress-oriented dispersing aid and the like. The modified basalt fiber is a basalt fiber which is subjected to amino silanization through a silane coupling agent KH-550 and then is catalytically grafted with ethylenediamine tetraacetic acid and hydroxyethyl methylacrylate through DCC (dicyclohexylcarbodiimide); the slow-release mineralizer comprises calcium sulphoaluminate and silicon-based coated nano calcium sulfate; the silicon-based coated nano calcium sulfate is core-shell structure powder formed by coating a nano calcium sulfate core material with a silicon dioxide shell layer; the concrete is strong in interface bonding, excellent in dynamic fatigue resistance, good in durability and stable in volume, and the problem that the mechanical property, the durability and the dynamic anti-interference capability of the concrete cannot be considered at the same time is solved.

The invention discloses multi-source composite expansion super-early-strength concrete and a preparation method thereof. The concrete comprises a cementing material, aggregate, a water reducing agent, water and a multi-source composite expansion system. The expansion system is composed of a plastic expansion agent, a calcium sulphoaluminate early expansion source, a magnesium oxide delayed expansion source and an internal curing material. Through precise component design and function time sequence matching, a cooperative compensation network covering the whole life cycle of the concrete is constructed, a plastic expanding agent inhibits plastic shrinkage, calcium sulphoaluminate compensates early-stage self-shrinkage, magnesium oxide resists medium-and-long-term drying shrinkage, an internal curing material provides continuous moisture guarantee for the above process, and the overall performance of the concrete is improved. And the efficiency of each expansion source is excited and coupled. According to the invention, seamless and accurate shrinkage compensation from a plastic stage to a service later stage can be realized on the premise of ensuring the super early strength characteristic of the concrete, the technical problem that the super early strength concrete is easy to crack due to severe shrinkage is fundamentally solved, and the volume stability and durability of the structure are remarkably improved.

The invention relates to the technical field of refractory materials, in particular to a waste magnesia-calcium brick-containing refractory material and a preparation method thereof, and the waste magnesia-calcium brick-containing refractory material comprises the following components: composite aggregate, calcium aluminate cement, urea resin-aluminum dihydrogen phosphate, active alpha-Al2O3 micro powder, silica micro powder and sodium tripolyphosphate. In the room-temperature spraying maintenance and low-temperature working stage, hydration of free CaO in the waste magnesia-calcium bricks and erosion of OH <-> are prevented through the hydrophobic effect of fluorinated polyphosphazene and modified zirconium oxide sol, and the compatibility and wettability of the composite aggregate and cement paste are improved through carboxylic acid groups of carboxyethyl silanetriol and polyethylene glycol monomethyl ether. According to the present invention, with the temperature rising, the aluminum dihydrogen phosphate forms the viscous liquid phase to wrap the aggregate so as to provide the temporary protection, the temperature continues to rise, the zirconium oxide and the nanometer Al2O3 react with the CaO and the MgO to generate the CaZrO3 and the MgAl2O3, the aluminum dihydrogen phosphate reacts with the nanometer Al2O3 in the system to generate the AlPO4, and the CaZrO3, the MgAl2O3 and the AlPO4 form the multi-phase fire-resistant structure so as to further improve the fire resistance of the fire-resistant material;

The invention belongs to the technical field of building materials, and particularly relates to a micro-expansion anti-cracking waterproof composite deep groove filler and a preparation method thereof. The micro-bulking anti-cracking waterproof composite deep groove filler provided by the invention comprises cement, gypsum, mineral powder, nano silicon oxide, coarse aggregate, fine aggregate, modified fibers, an expanding agent, a polycarboxylate superplasticizer and water. According to the invention, polyacrylamide, calcium sulphoaluminate and magnesium oxide are adopted to jointly form an expanding agent, and early-stage-late-stage full-period shrinkage compensation is jointly formed in a concrete hydration process, so that the density of the concrete is effectively improved, and the waterproof performance of the concrete is further improved; according to the invention, sodium dodecyl benzene sulfonate and propylene glycol block polyether are adopted to carry out compound modification on graphene oxide, and gamma-aminopropyltriethoxysilane is connected to the surface of basalt fiber, so that the bonding strength of basalt fiber and a cement matrix and the compactness of the cement matrix are improved, and the waterproof and anti-cracking properties of concrete are further improved.

The invention relates to the field of furnace lining materials, in particular to a rapid repairing material for a tapping hole and a furnace lining of an intermediate frequency furnace. The rapid repairing material comprises the following components in parts by weight: 50-70 parts of tabular corundum, 10-20 parts of fused magnesite, 8-15 parts of alumina micro powder, 3-8 parts of nano zirconia, 5-12 parts of silicon carbide, 10-15 parts of silica sol and 2-5 parts of a reinforcing agent. Wherein the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride. The tabular corundum is mainly used as an integral framework; the fused magnesite is matched with the alumina micro powder to form magnesium aluminate spinel with a high melting point; the nano zirconium oxide can fill pores and is excellent in toughness; the silicon carbide has the advantages of high hardness, high thermal conductivity and high melting point; the reinforcing agent is titanium calcium aluminate coated with chromium nickel boride, although the adding amount is small, the high-temperature strength, toughness and thermal shock resistance of the repairing material can be remarkably improved, and especially the long-term corrosion resistance can be remarkably improved.

The invention discloses a super-early-strength shrinkage-free high-crack-resistance tunnel spraying repair material in the technical field of civil engineering materials, which comprises the following raw materials in percentage by mass: 35-45% of sulphoaluminate cement; 8%-12% of a superfine early strength admixture; 2%-3% of a calcium sulphoaluminate expanding agent; 1%-2% of a magnesium oxide-based expanding agent; 1-2% of a calcium-magnesium composite expanding agent; 10%-15% of hollow glass beads; 1.5%-2.5% of copper plated steel fiber; 0.1%-0.3% of polypropylene fiber; 25%-30% of graded quartz sand; 0.5%-1.0% of a polycarboxylic acid water reducing agent; 3%-5% of an alkali-free liquid accelerator; 0.3%-0.8% of a thixotropic agent; and 0.1%-0.3% of a thickening time control agent. According to the method, a multi-scale performance cooperative regulation system is innovatively constructed. Through accurate control of the hydration process of a gel system, a shrinkage stress multi-stage compensation mechanism and systematic integration of a fiber-matrix interface strengthening technology, the mutual restriction relationship among early strength development, volume stability and crack resistance of a traditional material is broken through.

The invention provides a mixed type shield synchronous grouting material and a grouting process, and relates to the technical field of building materials, the grouting material is composed of fast hydration Portland cement, activated aluminosilicate minerals, nanometer silicon powder, bentonite, a reversible thixotropic polymer, a delayed hydration agent, coated calcium aluminate fast setting powder and a coated silicate gel precursor. The early-stage reaction is inhibited by delaying hydration, and a controllable solidification sequence of slurry from a flowable stage, a rearrangement structure stage to a rapid solidification stage is realized by breaking a membrane under the action of temperature or pressure gradient. In the process, by monitoring the conductivity, the concentration of Ca < 2 + > / Mg < 2 + > and the temperature in real time, the adding amount of an additive and grouting parameters are automatically adjusted, so that the stable diffusivity of the material is kept and the curing speed is accelerated under different stratum conditions. The solidified body forms a C-S-H, C-A-S-H and N-A-S-H gel interpenetrating network, the permeability coefficient is low, the water dispersion resistance is high, and the shield grouting quality and the tunnel structure safety can be remarkably improved.

The invention discloses light building corrosion-resistant fiber concrete and a production method thereof, the light building corrosion-resistant fiber concrete comprises the following raw materials by mass: 300-400 parts of high belite sulphoaluminate cement, 10-20 parts of modified corrosion-resistant fiber, 50-80 parts of a mineral admixture, 800-1000 parts of a coarse aggregate, 600-700 parts of a fine aggregate, 5-10 parts of a composite admixture, and 120-150 parts of water; wherein the mineral composition of the high belite sulphoaluminate cement is as follows: 18 to 25 percent of C4AF, 15 to 20 percent of anhydrous calcium sulphoaluminate (C4A3S), 45 to 55 percent of belite (C2S) and less than or equal to 10 percent of other minerals. By optimizing the ratio of C4AF to anhydrous calcium sulphoaluminate in the high belite sulphoaluminate cement and combining with a special calcining process, the contradiction of low early strength caused by increase of the content of C4AF is solved, and meanwhile, a foundation is laid for long-term corrosion resistance; and by adopting a silane coupling agent-nano silicon dioxide composite modification technology, the limitation of limited single modification effect is solved, and the synchronous improvement of the corrosion resistance of the fiber and the interface bonding strength is realized.

The invention relates to the field of solid waste co-processing and utilization, and particularly discloses complex-phase gypsum-based self-leveling mortar and a preparation method thereof. The mortar comprises the following raw materials in parts by mass: 75-95 parts of complex-phase gypsum, 3-25 parts of an auxiliary cementing material and 0.5-2.5 parts of an auxiliary mixture, the complex-phase gypsum comprises semi-hydrated gypsum, dihydrate gypsum and anhydrous gypsum; the auxiliary gelling material is a mixed compound material of ordinary Portland cement, aluminate cement, a calcium sulphoaluminate cementing material and sulphoaluminate cement; the additive mixture comprises one or more of a retarder, a water-retaining agent, a suspension / stabilizer, a water reducing agent, a flow promoter, a defoaming agent, a water repellent and an exciting agent. The gypsum-based self-leveling mortar prepared by the invention integrates the advantages of single semi-hydrated gypsum and single anhydrous gypsum, realizes the characteristics of high early strength and high later strength, and has the advantages of high strength, good wear resistance and low cost.

The invention discloses a quick-hardening early-strength concrete mineral additive and a preparation method thereof, and belongs to the technical field of building materials. The additive comprises the following components in parts by weight: 50-75 parts of a mineral active material (compounded by silica fume, slag powder and metakaolin), 15-30 parts of a composite activator (sodium silicate, lithium sulfate and triethanolamine synergistically), 5-10 parts of a sustained-release microcapsule (calcium sulphoaluminate coated with nano-silica) and 2-5 parts of an auxiliary thickening agent (compounded by HPMC and a water reducing agent). The preparation method comprises the steps of mineral activation, excitant reaction and mixing of the microcapsule and the thickening agent. After the additive is doped into concrete, the 3h compressive strength is greater than or equal to 15MPa, the initial setting time is less than or equal to 5min, and the additive has low resilience (less than or equal to 13%), high durability (impermeability is greater than or equal to P11) and environmental adaptability (-5 DEG C strength fluctuation ratio is less than or equal to 9%). And compared with the prior art, the cost is reduced by 40%, and the method has remarkable economic and social benefits.

The invention relates to a recycling method of chemical polishing waste liquid, which comprises the following steps: (1) carrying out first pH regulation treatment on the chemical polishing waste liquid containing phosphate radicals, sulfate radicals, aluminum ions and + 3 valent iron ions to obtain aluminum mud and aluminum-removed liquid; (2) sequentially carrying out second pH regulation treatment, third pH regulation treatment and dealumination treatment on the aluminum mud to obtain a hydrated calcium aluminate product; (3) the aluminum-removed liquid is subjected to phosphorus removal treatment, and first phosphorus mud and phosphorus-removed liquid are obtained; sequentially carrying out fourth pH regulation treatment and first evaporative crystallization treatment on the first phosphorus sludge to obtain a sodium phosphate product; and sequentially carrying out fifth pH regulation treatment and second evaporative crystallization treatment on the dephosphorized liquid to obtain a sodium sulfate product. According to the method disclosed by the invention, phosphorus, sulfur and aluminum in the chemical polishing waste liquid are completely separated by utilizing different solubility of different substances in the solution when the pH value is the same, and a sodium phosphate product, a sodium sulfate product and a hydrated calcium aluminate product are respectively obtained, so that complete recycling of elements in the chemical polishing waste liquid is realized, and no byproduct waste is produced.

The invention relates to the technical field of building materials, and particularly discloses an aluminate amorphous strength accelerator for steam-curing-free concrete as well as a preparation method and application of the aluminate amorphous strength accelerator. The invention discloses an aluminate amorphous strength accelerator for steam-curing-free concrete. The aluminate amorphous strength accelerator is prepared from the following raw materials in parts by weight: 35 to 45 parts of calcium aluminate amorphous powder, 55 to 65 parts of high-activity gypsum, 1 to 2 parts of an early strength type powder polycarboxylic acid water reducing agent, 0.1 to 1 part of lithium salt, 0.1 to 0.5 part of a retarder, 0.02 to 0.05 part of a reinforcing agent and 1 to 3 parts of a nano early strength agent, the proportion of amorphous glass in the calcium aluminate amorphous powder is greater than 85%; the calcium aluminate amorphous powder and the high-activity gypsum are doped into the Portland cement for synergistic hydration, and the early strength type powder water reducing agent, the lithium salt, the reinforcing agent and the nano early strength agent are utilized for synergistic interaction, so that the early strength and the volume stability of the prefabricated part are improved.

The invention discloses an anti-fracture building concrete material and a preparation method thereof, and relates to the technical field of building materials, the concrete material comprises the following raw materials by weight: 280-380 parts of cement; 500 to 600 parts of fine aggregate; 800 to 1000 parts of coarse aggregate; 1.5 to 3.5 parts of a degradable fiber inclusion; 20 to 40 parts of silica fume; 15 to 30 parts of rice hull ash; 10 to 20 parts of modified natural zeolite; 5-10 parts of an intelligent phase change material; 3-5 parts of a polycarboxylic acid water reducer; 5 to 10 parts of a calcium sulphoaluminate expanding agent; 150 to 200 parts of water; through the elaborately designed material formula, the anti-fracture performance and durability of the concrete are remarkably improved, the introduced degradable fiber inclusion is prepared by wrapping aramid fibers with a starch-based degradable material, and the structure enhances the interface bonding force between the fibers and a concrete matrix and also improves the durability of the concrete. The expansion of microcracks in the concrete is effectively inhibited through the high-strength characteristic of the aramid fibers, and the tensile strength and toughness of the concrete are improved.

The invention relates to an early strength concrete material for an expansion joint anchoring area and a preparation method thereof, and relates to the technical field of building materials, the early strength concrete material for the expansion joint anchoring area comprises the following components in parts by mass: gel master batch, coarse aggregate, fine aggregate, silica fume, mineral powder and a polycarboxylic acid water reducer; the gelling master batch is prepared from the following components in parts by mass: tricalcium silicate, anhydrous calcium sulphoaluminate, polyvinyl alcohol, polypropylene fiber and water; the preparation method comprises the steps of gelling master batch preparation, shearing and flaking, and mixing and forming. According to the early-strength concrete material for the expansion joint anchoring area and the preparation method of the early-strength concrete material, the concrete in the anchoring area is modified by using an organic matter as a crystal nucleus, so that a compact and ordered organic-inorganic cross-linked structure with a biomimetic structure is formed, and the early-strength performance and tensile toughness of the concrete are remarkably improved.

The invention belongs to the technical field of building materials, and discloses a concrete composite additive and a preparation method thereof. The additive comprises a polycarboxylate superplasticizer, nano silicon dioxide, modified starch ether, bentonite, a calcium sulphoaluminate activator, a bio-based antirust agent and a graphene oxide dispersion liquid. Through a step-by-step mixing process, liquid phase dispersion is performed firstly, then solid phase gradient mixing is performed, and ultrasonic treatment and low-temperature drying are combined, so that the problem of multi-component interface compatibility and activity retention is solved. The obtained additive can synergistically improve the anti-cracking and anti-rust performance of concrete, significantly reduce chloride ion penetration and prolong the durability period. And the preparation method is environment-friendly, efficient and suitable for high-durability concrete engineering.

The invention belongs to the technical field of preparation of low-carbon magnesia carbon bricks, and particularly relates to a low-carbon magnesia carbon brick for a ladle slag line and a preparation method of the low-carbon magnesia carbon brick. According to the low-carbon magnesia carbon brick for the steel ladle slag line, 98 # fused magnesia with the particle size being larger than or equal to 3 mm and smaller than 5 mm, larger than or equal to 2 mm and smaller than 3 mm and larger than or equal to 1 mm and smaller than 2 mm serves as coarse aggregate, 98 # fused magnesia with the particle size being larger than or equal to 0.088 mm and smaller than 1 mm serves as medium aggregate, a mixture of 98 # fused magnesia with the particle size being smaller than 0.088 mm, fused magnesia-calcium sand and zircon sand serves as powder, crystalline flake graphite and a phenolic resin binding agent are added, and the low-carbon magnesia carbon brick for the steel ladle slag line is obtained through sintering. According to the low-carbon magnesia carbon brick for the steel ladle slag line, calcium hexaluminate, magnesium silicide, chromium carbide and a rare earth compound are used as additives, and the raw materials are mutually matched and have a synergistic effect, so that the prepared low-carbon magnesia carbon brick for the steel ladle slag line has excellent mechanical strength, oxidation resistance and slag resistance.

The invention belongs to the technical field of refractory materials for hydrogen metallurgy, and discloses a high-strength heat-insulating castable for hydrogen metallurgy as well as a preparation method and application of the high-strength heat-insulating castable. The invention discloses a high-strength heat-insulating castable which comprises the following raw materials in percentage by mass: 15-25% of modified aluminum oxide hollow spheres with the particle size of 5-3mm, 7-13% of modified aluminum oxide hollow spheres with the particle size of 3-2mm, 2-4% of modified aluminum oxide hollow spheres with the particle size of 2-1mm, 7-11% of modified perlite with the particle size of 3-0.074 mm, 18-28% of quartz powder, 4-6% of silicon dioxide powder, 25-35% of pure calcium aluminate cement and 0.5-2% of yttrium oxide powder. A water reducing agent accounting for 0.05-0.15% of the total mass of the raw materials, a pore forming agent accounting for 0.03-0.07% of the total mass of the raw materials and water accounting for 17-21% of the total mass of the raw materials are added. The castable disclosed by the invention has the comprehensive properties of high strength, low heat conductivity, high volume stability and excellent H2 / CO erosion resistance, and meets the comprehensive harsh requirements of hydrogen metallurgy application scenarios.

The present application relates to a kind of sea sand chloride solidifying agent and its application method, the solidifying agent includes solidifying agent A and solidifying agent B;The solidifying agent A is proportioned according to the raw material of weight parts as follows: modified hydrotalcite 2~5 parts, ultrafine silica powder 0.05~0.2 parts, water 30~120 parts;The solidifying agent B is proportioned according to the raw material of weight parts as follows: metakaolin 1~4 parts, calcium hydroxide 0.1~0.3 parts, water 45~180 parts.The present application is attached to the surface of sea sand by modified hydrotalcite with ion adsorption effect and forms inner solid layer, can effectively absorb the chloride ion released by sea sand;While using calcium hydroxide to excite metakaolin with sheet shape and form stable outer solid layer, can effectively prevent the shedding of inner solid layer material;The generated hydrated calcium silicate and hydrated calcium aluminate gel can also absorb the chloride ion solidified from the escape of inner solid layer, further improve the chloride ion solidification effect.

The present invention describes a multi-component inorganic capsule anchoring system for chemically fastening anchors and post-installed reinforcements in a mineral matrix, comprising a curable powdered aluminum cement component A and an initiator component B for initiating a curing process in an aqueous phase, wherein the powdered aluminum cement component A is an aluminum cement component based on powdered calcium aluminate cement, and wherein component B comprises an accelerator component and water. Furthermore, the invention relates to a method for chemically fastening anchoring members, preferably metal anchors and post-installation reinforcements, in a mineral matrix, such as a structure made of bricks, concrete, pervious concrete or natural stone.

The invention discloses high-durability quick-hardening concrete and a preparation method thereof, and belongs to the technical field of building materials. The concrete is prepared from the following raw materials: aluminoferrite cement, vitreous calcium aluminate clinker, a coagulant nucleation agent, a nano hybrid siliceous material, a calcium-magnesium composite expanding agent, a self-healing agent, a hydration heat regulating agent, a water reducing agent, an early strength agent, a defoaming agent, a thickening agent, a retarder, an air entraining agent and aggregate. The coagulating nucleating agent is prepared from semi-hydrated gypsum, ferrous sulfate and aluminum potassium sulfate; the nano hybrid siliceous material is prepared by reacting acidic silica sol with sodium methyl silicate at 40-60 DEG C for 1-3 hours. According to the high-durability quick-hardening concrete and the preparation method thereof, the iron aluminate cement, the vitreous calcium aluminate clinker, the coagulant nucleation agent, the nano hybrid siliceous material, the calcium-magnesium composite expanding agent, the self-healing agent and the hydration heat regulating agent are utilized to form a brand-new high-durability and high-adaptability quick-hardening system. The mechanical property, the volume stability and the durability are comprehensively superior to those of the traditional quick-hardening concrete.

This invention discloses a grouting material suitable for rapid sealing of water-rich strata, its preparation method, and its application, belonging to the field of grouting material technology. The raw materials for its preparation include component A and component B; component A, by mass parts, includes 20-80 parts cement; 10-50 parts fly ash extract; 20-60 parts water; 0.01-1 parts polycarboxylate superplasticizer; 0.025-0.05 parts polyacrylamide; 0.1-0.6 parts hydroxypropyl methylcellulose; 0.5-1 parts disodium hydrogen phosphate; and 1.5-4.5 parts calcium aluminate; component B is water glass, and the volume ratio of component A to component B is 1-5:1. The grouting material provided by this invention possesses properties such as early strength, rapid setting with adjustable setting time, good fluidity, and high water retention rate, which can meet the rapid sealing requirements of underground engineering projects such as tunnels and coal mines.

The application provides an explosion-proof refractory castable and relates to the technical field of refractory castables. The explosion-proof refractory castable comprises the following components in parts by mass: corundum 50-70 parts, zirconium oxide powder 20-40 parts, silicon carbide powder 10-15 parts, pure calcium aluminate cement 1-5 parts, explosion-proof agent 3-15 parts, and the castable has a permeability of (10.9-12.1) x 10 4 m 2 , and good anti-burst performance.

The present application relates to the technical field of building materials, in particular to a thermodynamic modified material for grotto rock mass fissure grouting and a preparation method thereof, which comprises the following components in a mass ratio: lime-based material 100-200 parts; quartz sand 30-50 parts; metakaolin 30-70 parts; calcium aluminate expansive agent 10-20 parts.The present application has the advantages of optimized thermal conductivity, controlled thermal expansion coefficient, improved microstructure and comprehensive performance.The thermal conductivity of the lime-based grouting material is higher than that of traditional tung oil materials, reducing thermal stress concentration caused by temperature gradient;the thermal expansion coefficient can be changed from negative to positive by adjusting the water-cement ratio and the amount of expansive agent, and tends to be close to the limestone rock mass, reducing the risk of interface peeling;the optimized material has higher crystallinity and denser structure, reducing microfissures and improving heat conduction efficiency;while maintaining high mechanical strength and durability, the material realizes directional modification of thermodynamic properties, providing technical support for long-term preservation of grottoes.

The preparation method comprises the following steps: preparing raw materials: mixing and stirring mullite fine powder, tabular corundum fine powder, active SiO2 micro powder, a-Al2O3 micro powder, kyanite, Guangxi white mud and CA-70 calcium aluminate cement to obtain premixed fine powder; the preparation method comprises the following steps: stirring microporous mullite particles, alumina hollow balls and tabular corundum particles, sequentially adding premixed fine powder, surface modified stainless steel fibers, explosion-proof fibers and an additive, and continuously stirring to obtain the heat-insulating refractory castable, adding water into the heat-insulating refractory castable, injecting into the cover body of the heat-insulating cover, and vibrating and compacting to form a lining green body; curing the lining blank at room temperature, and baking to obtain the thermal insulation cover lining of the torpedo tank car; the thermal insulation refractory castable prepared by the invention and the torpedo car thermal insulation cover lining prepared based on the thermal insulation refractory castable have the comprehensive properties of light weight, low thermal conductivity, high strength, long service life and the like.

The invention discloses waste brick micro powder based geopolymer concrete and a preparation device and method, and belongs to the technical field of building materials, the waste brick micro powder based geopolymer concrete comprises a crushing device, a grinding device, a conveying device, a stirring device and a forming device; the crushing device is used for crushing waste bricks to form waste brick fragments, the grinding device is used for grinding the waste brick fragments to form waste brick micro powder, and the two ends of the conveying device correspond to the discharging end of the crushing device and the feeding end of the grinding device correspondingly and are used for conveying the waste brick fragments. According to the invention, the waste brick micro powder is used as a mixed material or admixture for replacing cement and reacts with water to generate hydrated calcium silicate gel and calcium hydroxide; the hydrated calcium silicate gel can bond the aggregate to form a compact structure with certain mechanical strength, and the calcium hydroxide can react with amorphous SiO2 and Al2O3 in the waste brick micro powder to generate hydrated calcium silicate, hydrated calcium aluminate or hydrated calcium aluminosilicate; a series of problems caused by nowhere to stack a large amount of waste concrete are effectively solved.

This invention discloses a treatment process for high-concentration sulfate wastewater, belonging to the field of wastewater purification technology. The invention first provides a multifunctional composite ion sieve, the raw materials of which include magnetic core microspheres, calcium aluminate precursor components, heavy metal chelating agents, scale inhibitors, antioxidants, antibacterial agents, host-guest recognition agents, polysaccharide compounds, polyacrylic acid compounds, crosslinking agents, and initiators. The ion sieve is prepared through steps including magnetic core preparation, calcium aluminate precursor functional layer deposition, small molecule modification layer loading, and pH-responsive outer shell coating. In use, the ion sieve is added to wastewater and stirred for adsorption. After adsorption saturation, solid-liquid separation is achieved through magnetic separation, and the material is regenerated and recycled sequentially using desorption and reconstruction solutions.

The invention provides a double-repairing-material composite system for self-repairing internal and external cracks of concrete, which comprises an internally doped composite dry powder repairing agent and an externally coated intelligent repairing liquid, the internal doping type composite dry powder repairing agent comprises high-activity modified silicate, silica fume, a composite catalyst, a calcium sulphoaluminate expanding agent, a magnesium oxide expanding agent, epoxy resin microcapsules, surface modified polypropylene fibers, a microbial carrier, a polycarboxylate superplasticizer, a dispersing agent and filler. The external coating type intelligent repairing liquid comprises an alkyl alkoxy silane mixture, a waterborne epoxy-acrylic acid hybrid emulsion, a latent curing agent, superfine core powder, nano silicon dioxide dispersion liquid, nano calcium carbonate, colored active mineral powder, a wetting agent, a defoaming agent, a flatting agent, a mildew preventive and water. Related preparation methods and uses are also provided. The double-repairing-material composite system is easy and convenient to use, can achieve multiple triggering and synergistic effect, can repair internal and external cracks at the same time, and is good in repairing effect.

This invention provides a quadruple ion-coupled erosion-protected concrete and its preparation method, relating to the field of special concrete materials technology. The concrete comprises basic components and functional admixtures. The basic components include cementitious materials, aggregates, and water. The functional admixtures include a coupling ion locking agent, a dual-interface film-forming aid, and a salt-expansion-resistant crack-resistant agent. The coupling ion locking agent includes calcined calcium aluminum hydrotalcite and diethylenetriamine pentacarboxylate; the dual-interface film-forming aid includes isobutyltriethoxysilane and lithium silicate; and the salt-expansion-resistant crack-resistant agent includes calcium sulfoaluminate expansion agent and lightly calcined magnesium oxide. The three admixtures work synergistically from three dimensions: active ion solidification, in-situ interface shielding, and full-cycle volume compensation, achieving simultaneous solidification of the four erosion ions, continuous blocking of penetration channels, and effective offsetting of salt crystallization expansion stress. This ensures the long-term safe service of the concrete under extreme conditions of high water pressure, high humidity, alternating wet and dry conditions, and multi-ion coupling erosion.

This invention belongs to the field of refractory materials for coke ovens in the coking industry, specifically relating to a refractory coke oven lining repair material and its preparation and application method. This application uses high-alumina bauxite, calcium hexaaluminate, calcite, biotite, wollastonite, and pyrophyllite as main materials, BaO as additives, and borosilicate glass powder and calcium phosphate as binders. Because the main materials of this repair material include high-alumina bauxite and calcium hexaaluminate, it has a high degree of compatibility with the original castable refractory, resulting in strong bonding. A single repair can extend the service life by more than one year, and it can be repeatedly repaired, thereby greatly improving the overall service life of the coke oven lining, reducing coke oven costs, and eliminating resource waste. This repair material can directly repair damaged parts of the coke oven without treating the lining, meeting the coke oven's usage conditions and enabling the reuse of the lining. Furthermore, the repair material's preparation method is simple, has a short construction cycle, and is easy to industrialize.