6 results about "Tricalcium aluminate" patented technology

The invention discloses a fiber concrete preparation for a pavement, a preparation method thereof and a pavement construction method, relates to the technical field of road construction, and solves the problems of poor elasticity, durability and other performances of the existing pavement. Comprising a binding material composed of Portland cement, granulated blast furnace slag powder and silica fume, aggregate composed of continuous graded broken stone and machine-made sand, composite fiber composed of basalt fiber and polyvinyl alcohol fiber, a functional additive composed of a water reducing agent, a water-retaining agent and a defoaming agent, a catalyst composed of nano-silica and tricalcium aluminate, and water. The pavement construction method comprises the following steps: paving the preparation within 30 minutes, vibrating by adopting a high-frequency vibrator, leveling by adopting a laser leveling machine, covering with geotechnical cloth, and maintaining under standard conditions. The method can be applied to pavement construction, and is particularly suitable for severe pavement scenes such as severe cold and heavy load.

This invention discloses an additive with chloride-fixing and toughening functions, its preparation method, and its application. The additive uses tricalcium aluminate and sodium acrylate as main raw materials. Under alkaline conditions, a wet grinding process hydrates tricalcium aluminate to form a calcium-aluminum layered bimetallic hydroxide structure, allowing acrylate atoms to intercalate into the interlayer, forming a stable organic-inorganic composite structure. When applied to cement-based materials, the layered structure reacts with chloride ions to generate chloride-containing hydration products, achieving chloride ion solidification. Simultaneously, the organic components in the composite structure undergo polymerization under the action of an initiator, forming a polymer network in the cement matrix, thereby improving the material's toughness. When added to cement-based materials at 1-5% of the cementitious material mass, the 28-day flexural strength can be increased by 38%-113%, and the 28-day chloride ion solidification rate can be increased by 17%-23%, while maintaining good workability. This invention achieves the simultaneous introduction of chloride ion solidification and material toughening functions through a single additive, simplifying the material system. It is suitable for cement-based materials containing endogenous chloride ions and has good engineering application prospects.

The invention relates to the technical field of cracking catalysts, in particular to a high-activity coal gangue cracking catalyst modification process which comprises the following steps: crushing coal gangue, spraying an alkaline pretreatment solution on the surface, and roasting to obtain thermally activated coal gangue powder; soaking the thermally activated coal gangue powder in an acidic treatment solution, heating in a constant-temperature water bath, washing, and drying to obtain acid modified coal gangue powder; soaking the acid-modified coal gangue powder in a metal salt solution, fully dipping through ultrasonic treatment, and drying to obtain high-activity coal gangue powder; and mixing the high-activity coal gangue powder with tricalcium aluminate hexahydrate and water, performing spray drying to generate microspheres, and calcining the microspheres in a kiln to obtain the high-activity coal gangue cracking catalyst. According to the high-activity coal gangue cracking catalyst, through matching and combination of the raw materials and the preparation steps, the catalytic activity of the catalyst can be improved, the internal structure of coal gangue is improved, the mechanical strength is enhanced, and the service life is prolonged.

This invention discloses a method for designing the composition of a limestone powder-containing TSA-resistant cementitious material for tunnel concrete, comprising the following steps: Step 1, determining the TSA erosion environment level of the tunnel structure concrete; Step 2, determining the mass dosage W of highly active cementitious material per cubic meter of concrete. CM Step 3: Determine the mass percentage R of tricalcium aluminate in the highly active cementitious material. C3A Step 4: Determine the type and composition of the high-activity cementitious material; Step 5: Determine the mass quantity (W) of stone powder used as a low-activity cementitious material per cubic meter of concrete. LS Step 6: Determine the composition and mass percentage of cementitious materials in a single cubic meter of concrete. Since all materials involved in this method are mature and widely used, they are readily available, their quality is controllable, and their indicators are easy to obtain. Furthermore, this method can provide corresponding material composition designs for different low-temperature sulfate attack environments, making it highly targeted, covering most low-temperature sulfate environments, and has broad prospects for widespread application.

The invention relates to the technical field of solid waste resource utilization, in particular to a high-value utilization method of calcium carbide slag and secondary aluminum ash. The method comprises the following steps: S1, mixing carbide slag and secondary aluminum ash in a mass ratio of (50-80): 100, then adding into water for hydrolysis, and after hydrolysis is finished, carrying out vacuum filtration and drying on slurry; s2, doping the fully dried hydrolyzed aluminum ash with 5-15 wt% of carbide slag, and calcining at 900-1100 DEG C to obtain a calcium aluminate clinker; and S3, leaching the calcium aluminate clinker in a sodium carbonate solution. The added carbide slag reacts with aluminum hydroxide generated by hydrolysis of metal aluminum and aluminum nitride to generate tricalcium aluminate hexahydrate, soluble villiaumite is fixed in hydrolyzed aluminum ash in the form of calcium fluoride, the calcination temperature of calcium aluminate clinker is reduced to 900-1100 DEG C, dodecacalcium heptaaluminate is generated through calcination, and the aluminum extraction rate can reach 93.2%.

The application discloses a high-crack-resistance low-heat Portland cement and a preparation method thereof. The application belongs to the technical field of building materials and comprises, by weight, 81-92 parts of cement clinker, 2-7 parts of gypsum, 1-4 parts of an activator, and 5-17 parts of an adjusting material. Mineral components in the cement clinker comprise, by weight percentage, 30-40% of tricalcium silicate, 35-45% of dicalcium silicate, 3-8% of tricalcium aluminate and 14-17% of tetracalcium aluminoferrite. The adjusting material comprises, by weight percentage, 35-46% of bentonite, 31-40% of superabsorbent resin, 10-23% of hollow glass microbeads and 6-18% of alcohol amine auxiliary agent. The application can significantly improve the comprehensive performance of the low-heat Portland cement, so as to reduce the cracking risk of concrete in a severe and complex environment.