13 results about "Micro aggregates" patented technology

The invention belongs to the field of solid waste resource utilization, and particularly discloses a method for preparing flow-state solidified soil through cooperation of construction waste recycled aggregate and steel slag micro powder. The fluidized solidified soil is prepared from the following components in parts by weight: 40 to 60 parts of steel slag micro powder, 10 to 30 parts of recycled micro powder, 20 to 40 parts of recycled coarse aggregate, 15 to 30 parts of recycled fine aggregate, 10 to 20 parts of recycled fine aggregate, 25 to 40 parts of water and 0.5 to 1.5 parts of polycarboxylate superplasticizer. A steel slag micro powder and regenerated micro powder self-activated gelling system is adopted to replace a traditional gelling material and is matched with regenerated coarse, fine and fine aggregate three-stage grading to construct a close packing structure, and then staged CO2 mineralization treatment is performed, so that the solid waste mixing amount is increased, carbon emission is reduced, the drying shrinkage rate of the prepared flow-state solidified soil is greatly reduced, and the quality of the prepared flow-state solidified soil is improved. Meanwhile, the fluidity is regulated and controlled through the polycarboxylic acid water reducing agent, the constructability is guaranteed, and a low-carbon and high-efficiency path is provided for large-scale utilization of the construction waste and the steel slag.

The application discloses a mine filling solidified material prepared from domestic waste incineration fly ash and a preparation method thereof, and relates to the technical field of waste recycling and reuse, and comprises the following raw materials in mass fractions: 25-35 parts of filling solidified agent, 18-24 parts of coarse tailings, 12-16 parts of fine tailings, 7-9 parts of deionized water and 0.3-0.6 parts of fly ash modifier. On the basis of fly ash harmless treatment, the performance and strength of the filling slurry are improved by adding the fly ash modifier, so that the fly ash can be effectively applied in mine filling, the fly ash landfill and secondary pollution problems are reduced, and under the complex solubilization effect, more calcium silicate hydrate is formed in the hydration process of the fly ash modifier in the filling solidified agent, and the hydration reaction of the mineral powder and the harmless fly ash is promoted. Through the volcanic ash activity excitation effect of nano silica ash and the micro aggregate filling effect of the floating beads, the compressive strength of the filling body is improved.

The invention discloses a preparation method of anti-corrosion concrete for a saline soil area based on lithium slag, and belongs to the technical field of building materials. According to the method, the lithium slag is used as an admixture to be applied to concrete preparation, and the impermeability, chloride ion permeability resistance and sulfate erosion resistance of the concrete are improved by utilizing active ingredients and a micro-aggregate effect of the lithium slag, so that the corrosion resistance of the concrete in a saline soil region is remarkably enhanced. According to the invention, the resource utilization of the industrial solid waste lithium slag is realized, the production cost of the concrete is reduced, the service life of the concrete structure in the saline soil region can be effectively prolonged, and the method has remarkable economic benefits and environmental benefits.

The application discloses a concrete track slab mixing material and a preparation method, relates to the technical field of high-speed railway component construction, and through the nucleation effect of a nanocrystalline core early strength agent, the cement hydration process is greatly accelerated, the compressive strength of sleeper concrete is significantly improved after 12h of steam curing, the 1d activity index far exceeds the standard requirement, the rapid demolding requirement of the sleeper is met, and defects such as corner drop and cracks are effectively reduced; the pozzolanic effect of superfine mineral powder and silica fume is continuously exerted, the micro aggregate filling effect of a high polymer viscosity reducer is used, the later strength of the concrete continuously grows, meanwhile, the dense filling effect of the high polymer viscosity reducer makes the internal structure of the concrete more compact, the chloride ion penetration resistance and the frost resistance are significantly improved, and the service life of the sleeper is prolonged.

The invention relates to the field of waste slurry treatment, in particular to a solid-waste-based soft soil curing agent and a preparation method thereof.The curing agent is prepared by mixing, by weight, 15-35 parts of cement, 25-50 parts of mineral powder, 15-35 parts of activated and regenerated micro powder, 10-20 parts of modified steel slag powder, 5-10 parts of desulfurized gypsum and 0.5-2 parts of alkali activator; the sum of the parts by weight of the components is 100 parts. The mineral powder and the power plant desulfurized gypsum are introduced into the curing agent, and the curing strength can be greatly improved under the synergistic effect of the mineral powder and the power plant desulfurized gypsum; the activated regenerated micro powder and the modified steel slag powder are doped, the active components participate in hydration to form strength, and the other components mainly play a role in filling micro aggregates, so that the porosity is reduced, the compactness is improved, the curing strength is improved, and the permeability coefficient is reduced; an alkaline environment provided by doping the alkali activator is beneficial to exciting the activity of the gelling component and quickly curing to form strength.

This invention discloses a multifunctional nano-loaded porous microaggregate, its preparation method, and its applications. The multifunctional nano-loaded porous microaggregate includes modified carbonate particles and nanofunctional materials loaded on the modified carbonate particles. The modified carbonate particles are obtained by surface roughening and / or porosification of a carbonate matrix material. This application uses widely available carbonate materials and employs a low-energy-consumption rapid calcination technology to porosilicate / roughen the surface of the carbonate materials, which is more conducive to the loading of nanofunctional materials. Further heat treatment further enhances the loading degree between the nanofunctional materials and the modified carbonate materials. This method is suitable for large-scale production, has low cost, and yields materials with good electrical conductivity and mechanical properties, making it suitable for various construction fields.

The invention relates to a river and lake sediment elution method capable of controlling aggregate pollutant release, which comprises the following steps: judging the crushing sensitivity under disturbance by measuring micro aggregate binding energy including electrostatic force and organic bonding strength in sediment; establishing an aggregate stress response relationship, and predicting a structural disintegration behavior at a disturbance shear rate; the aggregate is divided into a breakable type, a controllable breaking type and a stable type; performing response fitting on the disturbance parameters of the shear rate and the fluid kinetic energy and the pollutant release rate, and determining a nonlinear threshold interval; setting a disturbance threshold window to enable disturbance energy to be between an aggregate decomposition starting point and a pollutant overflow point; the disturbance rhythm is controlled to guide the aggregate to be disintegrated in order; according to the method, a response model between the disturbance shear rate and the aggregate disintegration behavior is established, a key structure fracture point and a pollutant release inflection point are identified, a disturbance-release nonlinear function relation is constructed, and instantaneous pollutant burst release caused by too strong disturbance in traditional elution is effectively avoided.

The invention relates to the technical field of building materials, in particular to a durable building material for resource utilization of solid waste barium slag and a preparation method of the durable building material. The material is composed of Portland cement, mineral powder, fly ash, stabilized barium slag, aggregate, a water reducing agent and the like. The barium slag modifier which is synthesized through three-step reaction and integrates the functions of chelation, permeation and oxidation has a synergistic effect with a sulfate radical slow-release agent and a trapping agent, soluble barium ions and sulfides in barium slag are converted into stable barium sulfate, and free sulfate radicals are removed. The stabilized barium slag serves as inert functional powder, and after the stabilized barium slag is compounded with other raw materials, the effects of micro aggregate filling and interface strengthening are achieved. According to the method, efficient detoxification and bulk digestion of the barium slag are achieved, the obtained material is low in leaching toxicity and good in mechanical property, has excellent sulfate corrosion resistance, volume stability and durability, is adaptive to existing production equipment, does not need to be greatly improved, conforms to the green and low-carbon development concept, and provides a reliable way for solid waste recycling.

The invention discloses hydrophobic recycled concrete and a preparation method thereof, and belongs to the technical field of building materials. The modified recycled aggregate is optimized and modified through the nanometer material, so that the modified recycled aggregate can be filled in aggregate microcracks and pores, interacts with a silane coupling agent, introduces active groups on the surface, reduces the adsorption of water molecules, has a better compatible interface with a cement matrix, and can significantly improve the mechanical strength and hydrophobicity of concrete; by compounding the hydrophobic reinforcing agent and combining the synergistic effect of the hydrophobic thixotropic agent, a uniform and stable hydrophobic network can be formed in the concrete, so that the probability that the concrete is eroded by the environment is reduced, and the service life of the concrete in different environments is prolonged. Besides, reinforced dry particles are added, so that the effect of a micro-aggregate reinforced phase can be achieved, the compactness and strength of the concrete are remarkably improved, the strength and hydrophobic performance are balanced on the whole, and market requirements are met.

The application relates to a heat-resistant concrete suitable for high-temperature tunnel secondary lining, which comprises the following components and contents (mass parts): low-heat portland cement 250-320, mineral admixture 60-120, coarse aggregate 950-1150, machine-made sand 650-850, micro aggregate 5-35, hydration heat inhibitor 0-2.0, high-temperature adaptive water reducing agent 3.6-4.4, defoaming agent 0-0.04, and water 145-160, wherein the mixing material has a mold content air content of less than or equal to 4%. Compared with the prior art, the product has the technical advantages of small working property loss, low later strength damage and good crack resistance in a high-temperature environment.

The application discloses a kind of marine engineering fair-faced concrete based on ecological material and preparation method thereof, it is related to marine engineering building material technical field, the concrete is composed of the following weight fraction components: alkali-activated slag 18~26 parts;Fly ash 6~12 parts;Marine urease-producing halophilic bacterial strain embedded type microbial mineralization precursor 0.8~2.5 parts;Classification calcined discarded oyster shell ecological active aggregate system 28~42 parts;Salt-tolerant exopolysaccharide thixotropic agent 0.03~0.12 parts;Nuclear shell structure recycled micro aggregate 5~15 parts;Alkaline activator, as Na2O equivalent, is 4.5%~7.5% of the total mass of alkali-activated slag and fly ash;Seawater 7~11 parts;Polycarboxylic acid water reducing agent 0.1~0.4 parts, the application is embedded carrier and alkali-activated system synergistically, with salt-tolerant exopolysaccharide thixotropic agent, classification calcined oyster shell aggregate and nuclear shell recycled micro aggregate, realizes crack self-repair, high resistance to chloride ion penetration and fair-faced surface homogenization.

The present application relates to a kind of high-strength geopolymer mortar containing low-quality silica fume and its preparation method, belong to geopolymer mortar technical field.To solve the problem of low compressive strength of geopolymer mortar containing low-quality silica fume, the present application provides a kind of high-strength geopolymer mortar containing low-quality silica fume, components include gel material, aggregate, micro aggregate and alkali activator, gel material includes low-calcium fly ash, calcium aluminate cement, low-quality silica fume and nanometer silicon dioxide, aggregate includes quartz sand, micro aggregate includes steel fiber, and alkali activator includes solid sodium hydroxide, water glass solution and tap water.The present application utilizes the synergistic effect of low-quality silica fume and nanometer silicon dioxide, increases the active silicon dioxide content of overall system, plays a good reinforcing effect on the compressive strength of fly ash geopolymer mortar, so that the compressive strength of geopolymer mortar containing low-quality silica fume reaches 80.4MPa.

The present application relates to the technical field of building materials, in particular to a kind of desulfurization gypsum-based desert sand composite material and its preparation method.Material with desulfurization gypsum, fly ash as main cementitious material, desert sand as fine aggregate, compound silica fume, quicklime, water reducing agent, latex powder and organic fiber, prepared by precise proportioning and multi-scale interface design.Through the regulation of water-binder ratio, sand and silica fume dosage, synergistic sulfate activation, pozzolanic effect and micro aggregate filling, form high-strength and high-toughness matrix;Using a variety of organic fiber single or mixed, realize strain hardening and multi-crack;Using a variety of curing system, especially steam curing or microwave curing, build bimodal pore structure.The ultimate tensile strain of the material is up to 9.61%, the 28-day compressive strength is more than 40MPa, which greatly absorbs desulfurization gypsum, fly ash and desert sand, reduces the dependence on cement and river sand, has high ductility, high strength and green low carbon characteristics, and is suitable for high-performance building and infrastructure engineering.