8results about How to "Appropriate setting time" patented technology

The invention discloses a dechlorinated and detoxified fly ash-waste glass powder-slag composite alkali-activated cementing material and a preparation method thereof. The alkali-activated cementing material takes hydrated calcium aluminosilicate gel and hydrated sodium aluminosilicate gel as main components, and comprises the following raw materials: dechlorinated and detoxified fly ash, waste glass powder, slag and an alkali activator, and the alkali activator is prepared from a sodium silicate solution and a sodium hydroxide solid; the raw materials are scientifically proportioned, so that efficient resource utilization is realized, and the performance of the alkali-activated cementing material is improved. The selected precursor is rich in active mineral components such as calcium, silicon and aluminum, an alkali activator prepared by adding a sodium silicate solution and a sodium hydroxide solid provides an ideal alkaline environment for a system, and the system can generate C-A-S-H gel and N-A-S-H gel at the same time due to complementary and synergistic effects of chemical components of all the components. Therefore, the material properties of high compressive strength, moderate setting time and reaction heat balance are realized, and meanwhile, good working performance and long-term durability are realized.

This invention discloses an early-strength, high-stability road grouting repair material and its preparation, belonging to the field of solid waste utilization and road grouting reinforcement technology. The raw materials of the early-strength, high-stability road grouting repair material of this invention include multi-source solid waste aggregates and a water-reducing agent; the multi-source solid waste aggregates, by mass percentage, include: 6.6 wt% fly ash, 5-15 wt% rapid-hardening sulfoaluminate cement, 64-74 wt% mineral powder, 13.4 wt% desulfurized gypsum, and 1% carbide slag. This invention constructs a quaternary solid waste system of fly ash-desulfurized gypsum-mineral powder-carbide slag, synergistically forming a slurry composite system with rapid-hardening sulfoaluminate cement and a water-reducing agent, and precisely controls the concentration of raw materials. During hydration, this system can generate supporting crystals, which not only provide high early-stage stone strength for the road grouting material, but also, due to its good stability, ensure high stone strength stability in the later stages.

The invention relates to the technical field of concrete preparation, in particular to solid waste based 3D printing concrete which comprises the following raw materials: cement, mineral powder, modified tungsten tailings, water glass, steel slag, tungsten tailing sand, composite fibers, dispersible latex powder, a water reducing agent, an early strength agent, a retarder and water. The preparation method comprises the following steps: mixing the cement, the mineral powder and the modified tungsten tailing powder to obtain a cementing material component A; mixing steel slag, tungsten tailing sand, dispersible latex powder, an early strength agent, a retarder and composite fibers to obtain a solid component B; adding a water reducing agent and water glass into water, diluting and uniformly stirring to obtain a liquid component C; adding the solid component B and part of the cementing material component A, stirring, then adding part of the liquid component C, mixing, adding the rest of the cementing material component A, adding the rest of the liquid component C, and stirring again to obtain the 3D printing concrete. The prepared concrete is good in mechanical property, and solid waste cooperative treatment is achieved.

The invention discloses a composite activator, a titanium extraction tailing-based cementing material using the composite activator and a preparation method of the cementing material, and belongs to the technical field of constructional engineering materials. The composite exciting agent comprises the following components in percentage by mass: 19%-27% of calcium sulphoaluminate cement, 17%-38% of aluminum sulfate, 2%-16% of calcium formate, 0%-17% of sodium silicate and 16%-42% of copperas. The preparation method comprises the following steps: doping a composite activator into a standard gelling system consisting of titanium extraction tailings, titanium gypsum, cement and lime according to a proportion of 1-5%, and enabling the median particle diameter D50 of mixed powder to be less than 15 microns through a co-grinding process. In order to solve the problems of slow development of early strength and generally low performance of the titanium extraction tailing-based cementing material, the synergistic excitation effect among the components in the composite exciting agent is utilized to promote rapid formation of ettringite and acceleration of hydration reaction, so that efficient utilization of solid waste in the titanium extraction industry is realized, and the utilization rate of the titanium extraction tailing-based cementing material is improved. The technical bottleneck of low early strength of the existing titanium extraction tailing-based cementing material is effectively solved, and the titanium extraction tailing-based cementing material is suitable for occasions with higher requirements on early strength, such as mine filling, roadbed engineering and the like.

The invention discloses white surface layer gypsum as well as a preparation method and application thereof, and belongs to the field of building materials. The white surface layer gypsum comprises the following components in parts by weight: 500-570 parts of modified citric acid gypsum, 400-460 parts of heavy calcium carbonate, 2-4 parts of cellulose, 1-3 parts of a retarder and 20-30 parts of ash calcium, the modified citric acid gypsum is obtained by calcining citric acid gypsum powder at a high temperature, adding a surfactant, mixing and irradiating; the surfactant comprises at least one of sodium alginate and sodium abietate. The obtained white surface layer gypsum is high in whiteness, strength and fineness, the problems of yellowing, surface layer cracking, hollowing, frosting and the like cannot occur after the white surface layer gypsum is applied to a wall surface, the problems of color and surface roughness of traditional surface layer gypsum are solved, a putty layer process is omitted, the construction time is shortened, and the construction cost and the secondary maintenance cost are reduced.

The application belongs to the technical field of brick and stone cultural relics protection, and particularly discloses a metakaolin-based calcium phosphate chemical bonding mortar, a preparation method and application thereof. The mortar is composed of the following raw materials in percentage by mass: 11.0-14.0% of high-activity coarse metakaolin, 3.0-5.0% of high-activity superfine metakaolin, 13.0-17.0% of calcium dihydrogen phosphate-hydrate powder, 52.0-56.0% of mullite sand, and the balance of mixing water. Compared with the prior art, the repair material can have compatibility, safety and certain weather resistance with the brick and stone cultural relics, the molar ratio of phosphorus and aluminum of the reactant is controlled, the particle size grading of the metakaolin is adjusted, the proportion of the product crystal and amorphous structure is regulated, and then the metakaolin-based calcium phosphate chemical bonding material with a strength gradient is prepared. The setting time of the prepared material is appropriate, the shrinkage rate is low, and there is no soluble salt, so the material has high applicability for the repair and reinforcement of the brick and stone cultural relics.

The application provides a quick-setting magnesium oxychloride bone cement as well as a preparation method and application thereof. The raw material composition of the quick-setting magnesium oxychloride bone cement comprises a solid phase and a liquid phase; the solid phase comprises magnesium oxide, magnesium chloride, zinc chloride and strontium hydrogen phosphate; and the liquid phase is water. The mass ratio of zinc chloride to magnesium chloride is (1-2):(9-8); the mass of strontium hydrogen phosphate is 3-5 wt.% of the total weight of magnesium oxide, magnesium chloride and zinc chloride. The ratio of the total mass of zinc chloride and magnesium chloride to the mass of water is 1:11-17; and the ratio of the total mass of zinc chloride and magnesium chloride to the mass of magnesium oxide is 1:6-9. The composite magnesium oxychloride bone cement prepared by the application has a suitable setting time, is convenient for clinical operation, has a high compressive strength, meets the strength requirement of dense bone, and can be used for bone repair of load-bearing parts.

The present invention discloses an integrated system for screening and solidifying and stirring shield slag slurry, including a support frame, a screening and separation module, a collecting and stirring module and a curing agent adding and homogenizing module; the screening and separation module includes a square hole screen, a transverse vibration motor, a longitudinal vibration motor and one or more spray pipes; the collecting and stirring module includes a collecting box and a horizontal stirring device installed in the collecting box, and the collecting box is located below the square hole screen; the curing agent adding and homogenizing module includes a mud pump, a conveying pipe and a curing agent automatic metering and adding device. The present invention realizes the continuous flow operation of shield slag coarse particles-mud separation, homogenization, and solidifying and stirring. With the help of the turbulent flow formed by the internal spacers of the conveying pipe, the curing agent and the mud are mixed in the conveying pipe, and there is no need to set up a mud homogenizing tank and a solidifying and stirring tank. The equipment occupies a small space and has a high degree of automation, providing equipment support for efficient and environmentally friendly treatment of shield slag.