76results about How to "Improve resistance to chloride ion penetration" patented technology

The invention particularly relates to nano recycled concrete, a processing technology and an application thereof. The existing nano recycled concrete also has the following defects that the corrosion prevention effect is not ideal when a conventional marine corrosion prevention technology is applied to a coastal assembly structure for 3D printing, and in addition, interlayer interface bonding and thixotropy of a conventional 3D printing material are insufficient. The invention provides nano recycled concrete. The nano recycled concrete is prepared from the following raw materials: compound cement, recycled sand, fly ash, polyvinyl alcohol, graphene oxide, steel fibers, organic fibers, a water reducing agent, a thickening time control agent, a mineral admixture and water. The 3D printing concrete has good cohesive water-retaining property and adjacent thin layer interface cohesiveness, a micro-capacitor is formed through combination of GO and PVA electrolyte to avoid formation of a corrosion battery in a concrete thin layer, and the 3D printing concrete has good marine durability and has good application prospects when being applied to coastal assembly structure engineering.

The invention discloses a chloride ion immobilizing agent and an application method thereof, and belongs to the field of civil engineering materials. The chloride ion immobilizing agent is obtained by thoroughly mixing a layered double hydroxide (LDH) and a substance which can be hydrated to generate the LDH in certain parts by mass; chloride ion immobilization is realized by virtue of a chemical reaction between Ca-Al-LDH and a water reducing agent intercalation product (Ca-Al-SP-LDH) thereof, and a chlorine salt and meanwhile by use of the ion exchange characteristic of Ca-Al-Si-LDH and Mg-Al-LDH; as a result, the adverse effect of internal chloride ions on the properties of a cement-based material is reduced, the erosion action of the chloride ions to a reinforcement is relieved, and the chloride ions in the service environment are prevented from permeation and diffusion into the reinforced concrete. When the dosage of the chloride ion immobilizing agent accounts for 2%-5% of the weight parts of a cementing material, the immobilization rate of chloride ions inside the concrete is greater than 90%; internal doping or surface coating protection is capable of enabling the reinforced concrete impermeability to the chloride ions to be improved by I to II levels; the chloride ion immobilizing agent is suitable for sea sand concrete, marine concrete and mortar, magnesium oxychloride cement products, steel structures and reinforcements as well as concrete anticorrosive paints.