5 results about "Micro aggregates" patented technology

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 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 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.