4results about How to "Improve early compressive strength" patented technology

The invention discloses a low-carbon concrete nano C-A-S-H seed crystal enhancer as well as a preparation method and application thereof. The reinforcing agent comprises the following raw materials in parts by weight: 150-200 parts of water, 20-25 parts of sodium silicate nonahydrate, 15-20 parts of calcium nitrate tetrahydrate, 5-8 parts of aluminum nitrate nonahydrate, 1-4 parts of a polycarboxylate superplasticizer, 1-4 parts of sodium hydroxide, 0.5-2 parts of a silane coupling agent and 0.5-2 parts of a sodium polyacrylate dispersing agent. The preparation method comprises the steps of dissolution, precipitation reaction, dispersion modification and pH adjustment. According to the invention, by optimizing the molar ratio of silicon to aluminum and constructing a composite dispersion system, the technical problems of easy agglomeration, poor stability and poor compatibility with a water reducing agent of the nano seed crystal are solved. When 0.5-2% of the additive is applied to concrete, the early strength can be remarkably improved, the workability maintenance can be improved, the activity of solid wastes such as fly ash and the like can be effectively excited, and a key technical support is provided for preparing high-performance low-carbon concrete.

This application relates to a composite grouting material, its preparation method, and its application, falling within the field of grouting material technology. The composite grouting material comprises an inorganic cementitious component, an organic modifying component, and water. By mass fraction, the inorganic cementitious component includes 30-50 parts of sulfoaluminate cement, 20-35 parts of silicate cement, and 5-15 parts of rapid-hardening mineral admixture. The organic modifying component includes 8-20 parts of polyimide prepolymer with anhydride and / or isocyanate end groups. The water-cement ratio is 0.28-0.38. By effectively synergistically employing the inorganic cementitious component and the organic modifying component, using a ternary cementitious system of "sulfoaluminate cement-silicate cement-rapid-hardening mineral admixture" as the inorganic framework, and introducing organic modification with polyimide prepolymer, the material exhibits high early compressive strength and high toughness, while simultaneously possessing high freeze-thaw resistance and high impermeability, effectively meeting the needs of tunnel leakage control and crack repair projects in high-altitude and cold regions.

This invention discloses a self-activated solid waste slurry and its preparation method, comprising waste slag, a solid waste cementitious material, and water. The components are expressed as follows by weight percentage or parts: 100 parts waste slag; 15-60 parts solid waste cementitious material, wherein the solid waste cementitious material consists of a silicon-aluminum rich precursor, a strongly alkaline activation source, and a rheology-modifying supplementary source, with a mass ratio of 1:(0.2-0.8):(0.1-0.4); and water. This invention eliminates the highly corrosive liquid chemical activator required in traditional alkaline activation materials, achieving self-activation through dry powder premixing of a strongly alkaline activation source, a silicon-aluminum rich precursor, and a rheology-modifying supplementary source.

The invention discloses a grouting material for offshore wind power engineering, and belongs to the technical field of building materials. The grouting material for offshore wind power engineering comprises the following raw materials in parts by weight: 10-60 parts of cement, 10-60 parts of a mineral admixture, 5-50 parts of fine aggregate, 0.5-5 parts of a hydrophobic functional material and 0.2-2 parts of an additive. Wherein the hydrophobic functional material is obtained by reacting modified silicon dioxide, perdecafluorooctyltriethoxysilane, hydrogen-containing silicone oil and tetraethyl silicate. The grouting material prepared by the invention has excellent corrosion resistance, impermeability, freeze-thaw resistance, durability and early and later strength, and is suitable for offshore wind power engineering construction.