5results about How to "Improve structural compactness" patented technology

The application discloses a method for improving the surface quality and performance of a laser cladding NiCrSiBC-WC composite coating, relates to the field of composite coating surface processing technology, and aims at solving the problem that the coating prepared through single laser cladding is prone to cracks. The method comprises the following steps: S1, pretreatment of a base material; S2, preparation of laser cladding powder; S3, laser cladding treatment; S4, temperature field auxiliary treatment; and S5, laser remelting composite temperature field auxiliary treatment. The laser remelting composite temperature field auxiliary technology can break the limitation of the WC material addition amount on the performance of the coating, and a low-WC-mass-fraction high-hardness crack-free NiCrSiBC-WC composite coating can be obtained through the technology. The structure compactness of the NiCrSiBC-WC coating is improved, and the surface hardness and bonding force of the coating are improved.

The application relates to the technical field of solid waste treatment and building materials, and discloses a modified sludge solidifying agent and a preparation method thereof, the solidifying agent contains modified aggregates 15-28 parts, a composite cementing agent 55-70 parts, an efficient water absorption modifier 6-12 parts, an organic polymer modifier 2-5 parts and early strength additives 1-3 parts in terms of weight fractions, and the components are mixed through proportioning and a segmented preparation process. The modified aggregates construct a framework support, the composite cementing agent provides hydration cementing action, the efficient water absorption modifier realizes rapid dehydration and heavy metal adsorption, the organic polymer modifier optimizes interface combination, and the early strength additives improve early strength. The application takes industrial solid waste as a main raw material, has high solid waste utilization rate, is low-carbon and environment-friendly, can quickly reduce the water content of sludge, significantly improves the mechanical properties and durability of a solidified body, effectively stabilizes heavy metals, and has a wide application prospect.

This invention discloses a composite coating for concrete structures, comprising a sealing primer, an intermediate coat, and a topcoat. The sealing primer is a polyurea coating with modified concrete added, the amount of modified concrete being 3%–6% of the coating weight, and the thickness of the sealing primer being 20–100 μm. The intermediate coat is a polyurethane coating with steel powder added, the amount of steel powder being 3%–6% of the coating weight, and the thickness of the intermediate coat being 80–200 μm. The topcoat is an epoxy resin coating with molybdenum disulfide powder added, the amount of molybdenum disulfide powder being 1%–4% of the coating weight, and the thickness of the topcoat being 50–100 μm. The sealing primer of this composite coating fills concrete pores and cracks, improving structural density and providing a good foundation for subsequent coatings. The intermediate coat enhances overall strength and impact resistance, while the topcoat provides excellent anti-friction properties and chemical stability, blocking external erosion. The synergistic effect of these three components significantly extends the service life of concrete structures in harsh environments.

This invention relates to a supersulfate cement concrete based on construction waste aggregate and minerals, and its preparation method. The concrete, by mass, comprises 380-460 parts supersulfate cement; 950-1250 parts modified mixed aggregate; 0-150 parts natural sand; 135-165 parts water; and a water-reducing agent at 0.7-1.2% of the total mass of the cementitious materials. The modified mixed aggregate is obtained by mixing construction waste and calcium vanadium stone enrichment at a mass ratio of (85-92):(8-15), followed by sequential modification with alkali solution, silane coupling agent, and slag. The present invention achieves a construction waste aggregate replacement rate of 70-100%, requires no complex modification equipment or processes, is easy to scale up for industrial production, and is highly practical.

The present application relates to a kind of carbonization 3D printing concrete mix design method and carbonization 3D printing concrete.The present application is introduced into carbon dioxide to cement-based printing slurry, controls its amount of introduction, while introducing carbon dioxide into cement-based printing slurry, according to the content of carbonation reaction product CaCO3, and the ratio of calcite and aragonite in the required concrete mixture, the amount of magnesium chloride is calculated, magnesium chloride and carbon dioxide are added into cement-based printing slurry at the same time, fully react, finally 3D printing concrete material is prepared.The present application improves the thixotropy of material by the addition of magnesium chloride, the generation of aragonite type calcium carbonate, the constructability of cement slurry is stronger, at the same time, the orientation of nanoscale aragonite fiber is arranged according to the printing direction, has excellent reinforcing and toughening effect, and the bending strength, bending strength and compressive strength are improved.