10results about How to "Improve early strength performance" patented technology

The present invention provides a modified fly ash, wherein the raw materials for its preparation include, by weight, 95-105 parts of fly ash, 5-25 parts of carbide slag, 0.2-3 parts of triisopropanolamine, 1-3 parts of sodium sulfate, 0.05-0.2 parts of modified graphene oxide, and 100-200 parts of water. The modified fly ash prepared by the present invention has excellent mechanical properties, high early strength and late strength, good fluidity, and meets the requirements of cement-based building materials. At the same time, the modified fly ash uses fly ash as raw material, saves costs and increases economic benefits, and realizes the resource utilization of solid waste.

The invention provides a nano-composite super-early-strength polycarboxylate superplasticizer and a preparation method and application thereof.The preparation method comprises the following steps that 1, a polyether macromonomer, a reducing agent, a functional monomer, an oxidizing agent and deionized water are added into a reaction container and stirred at the temperature of 25-45 DEG C till all the components are dissolved, and a reaction solution A is obtained; step 2, simultaneously dropwise adding an acrylic acid solution and a vitamin C aqueous solution into the reaction solution A in a stirring state at 25-45 DEG C, heating to 45-65 DEG C after dropwise adding is completed, carrying out a heat preservation reaction for a period of time, and adjusting a reaction system to be alkaline by using an alkaline compound and / or an aqueous solution of the alkaline compound to obtain a reaction solution B; and step 3, adding a calcium nitrate aqueous solution and a sodium silicate aqueous solution into the reaction solution B at 0-10 DEG C, and stirring to react for 30-60 minutes to obtain a finished product. The concrete early strength improver has the beneficial effects that the early strength of concrete is remarkably improved, the mixing amount is low, the water-reducing rate is high, the slump loss resistance is strong, the mud resistance is good, the preparation method is simple in process, the energy consumption is low, the production period is short, and industrial production is easy.

The invention provides a device and a method for improving the performance of cement concrete admixtures, and the device and the method for improving the performance of the cement concrete admixtures comprise a box body, stirring blades, ultrasonic vibration rods and ultrasonic vibrators. A stirring cavity is formed in the box body, the ultrasonic vibrator is arranged on the side wall of the stirring cavity, the stirring blade is installed in the stirring cavity, and the ultrasonic vibration rod is located at the bottom end of a center shaft of the stirring blade. A liquid inlet is formed in the upper part of the box body and is connected with an additive storage tank; a liquid outlet is formed in the lower part and is connected with a concrete mixer. The invention also provides a method which is used for carrying out ultrasonic treatment on the additive through the device and comprises the steps of uniformly stirring, carrying out ultrasonic vibration treatment for 20-120 seconds and the like. The water reducing rate of the treated water reducing agent is increased, the performance of the early strength agent in a low-temperature environment is improved, and the dispersity of an additive containing a nano material is remarkably enhanced. The performance of the concrete admixture can be effectively improved without changing the components of the admixture, and the concrete admixture is compact in structure, easy to operate and suitable for various admixture and concrete production conditions and has wide industrial application value.

The application discloses a preparation method of low-shrinkage low-heat low-carbon concrete, and has the technical characteristics that high-water-absorption autoclaved silicate functional aggregate is used to replace gravel and yellow sand, and the mass sum of fly ash and mineral powder in the cementing material can be up to 60% at most. The high-water-absorption water-saturated autoclaved silicate functional aggregate and the expanding agent are added into the concrete, the humidity is released through the functional aggregate, the internal curing and the expansion of the expanding agent are cooperated, the self-shrinkage, the drying shrinkage and the hydration heat shrinkage of the concrete are reduced, and the strength of the concrete is improved; the grading of the fine aggregate of the superfine yellow sand is improved through the addition of the fine functional aggregate, the working performance of the concrete is improved, and the low-carbon environmental protection of the concrete is realized through the large amount of mineral admixtures.

The invention provides a coal mine underground inorganic nanometer reinforcing material and application thereof, and belongs to the technical field of reinforcing materials. The coal mine underground inorganic nanometer reinforcing material provided by the invention comprises a component A, a component B and a component C, the mass ratio of the component A to the component B to the component C is 1: (0.1-0.5): (0.8-1.2); the component A comprises 60-90 parts of cement, 20-30 parts of fly ash, 1-5 parts of gypsum, 1-5 parts of a chain silicate nano material, 5-10 parts of a wetting agent and 0.5-2 parts of a retarder; the component B comprises 1-5 parts of a graphene oxide / carbon nanotube compound and 2-5 parts of a surfactant; and the component C comprises 10-30 parts of water glass and 5-10 parts of a water reducing agent. The coal mine underground inorganic nanometer reinforcing material provided by the invention has the characteristics of good permeability, high early strength and rapid curing.

The invention discloses a preparation method of a concrete crystal nucleus early strength agent. The preparation method of the concrete crystal nucleus early strength agent comprises the following steps: adding nano calcium silicate into a sodium alginate aqueous solution, carrying out ultrasonic dispersion to form an emulsion, dropwise adding the emulsion into an excessive soluble calcium salt solution through an atomizing nozzle to form a microsphere emulsion, filtering and centrifugally separating the microsphere emulsion to obtain calcium alginate-calcium silicate microspheres, and drying the calcium alginate-calcium silicate microspheres to obtain the concrete crystal nucleus early strength agent. Then pouring the microspheres into dihydrate gypsum micro powder to be fully mixed to form nano calcium silicate-gypsum microspheres, and finally blowing the nano calcium silicate-gypsum microspheres into a high-temperature furnace kiln through an air blower to react to obtain the powder concrete crystal nucleus early strength agent. The preparation method provided by the invention not only realizes resource utilization of industrial solid waste gypsum, but also realizes good dispersity of the calcium silicate crystal nucleus early strength agent in a powder state, avoids agglomeration of the crystal nucleus early strength agent, improves the early strength effect of the crystal nucleus early strength agent, and reduces the adverse effect on the performance of the existing product due to the use of a surfactant.

The invention relates to novel cement prepared by recycling waste residues and a preparation method thereof, and relates to the technical field of waste residue recycling, the novel cement comprises the following components by mass: 30-50 parts of composite modified waste residues, 3-5 parts of modified polyvinyl alcohol fiber, 30-50 parts of cement clinker, and 0.5-1.5 parts of a water reducer; the composite modified waste residue is prepared from the following raw materials: composite waste residue, an ion-doped mineralizer and a composite excitant. The preparation method comprises the following steps: mixing the composite modified waste residue and the water reducing agent, stirring, adding the cement clinker, carrying out dry mixing, adding the modified polyvinyl alcohol fiber, and stirring to obtain the novel cement prepared by recovering the waste residue. The cement has the effect of improving the early strength performance of the novel cement prepared by recycling the waste residues, and the cement has good compressive strength and stability.

The invention relates to a tobermorite concrete early strength agent prepared by a steam curing method. The tobermorite concrete early strength agent comprises water, solid powder and an air entraining agent, the mass ratio of the water to the solid powder is 0.5-0.8; the solid powder comprises carbide slag, fly ash and cement. According to the invention, industrial solid wastes are used and molded under the cementing action of a small amount of cement, and a porous structure is formed under the action of an air entraining agent, so that steam can fully permeate, and all reactants fully react under the condition of steam curing to generate tobermorite crystals.

The present invention relates to the technical field of building materials, and specifically to a dispersant for a crystal nucleus type early strength agent, a crystal nucleus type early strength agent and a preparation method. The dispersant for the crystal nucleus type early strength agent comprises the following raw materials in parts by weight: 1000-1600 parts of a polyether macromonomer, 30-60 parts of an unsaturated organic acid, 1000-1500 parts of water, 4-6 parts of a molecular weight regulator, 1-2 parts of a reducing agent, 5-15 parts of an oxidant, 5-27 parts of a cationic monomer, 20-55 parts of a complexing monomer, and 5-17 parts of an unsaturated phosphate ester. The dispersant of the present invention can improve the early strength performance of the crystal nucleus type early strength agent from the two aspects of reducing particle size and synergistic enhancement. Moreover, improving the early strength performance of the crystal nucleus type early strength agent can reduce the amount of the crystal nucleus type early strength agent used, thereby reducing the influence of the crystal nucleus type early strength agent on the later strength of the component, or even having no influence on the later strength of the component, so that the later strength of the component is stable.

The invention discloses a method for improving the dispersion performance of a hydrated calcium silicate seed crystal and application thereof. The method comprises the following steps: S1, adding silica fume, carbide slag, fly ash, water and grinding balls into a sealed grinding tank; s2, standing for 24 hours, and then carrying out wet grinding at the speed of 600 revolutions per minute; and S3, the step S2 is repeated, the final grinding time is determined according to the target particle size, and the raw material ratio is determined according to the target calcium-silicon ratio. The hydrated calcium silicate seed crystal is used as an early strength agent of Portland cement. The method is beneficial for improving the early strength and the later strength of the cement-based material doped with the C-S-H seed crystal.