7results about How to "Improve early compressive strength" patented technology

According to the modified fiber mining filling material and the preparation method thereof provided by the invention, through a dual modification technology of plasma treatment and a silane coupling agent, the uniform dispersity of fibers in a cementing agent is enhanced, and the properties such as rapid hardening, early strength and compressive strength retention rate of the filling material are remarkably improved. The filling material comprises cement clinker, solid waste, a retarder, an early strength agent, modified fibers, an accelerator, gypsum, a water reducing agent, a suspending agent and other raw materials, the modified fibers are treated through specific steps, surface functional groups are increased, and the compatibility and binding power of the modified fibers and a cementing agent are improved. The filling material disclosed by the invention has the advantages of good transportability, simplicity and convenience in construction, low cost and environmental protection characteristic, conforms to the development trend of green mining industry, is particularly suitable for being applied to mine filling and supporting, and has wide application prospects and social and economic values.

The invention relates to the technical field of concrete ground repairing materials, in particular to a rapid repairing agent for a high-freeze-thaw-resistant concrete pavement. Comprising the following raw materials in parts by weight: 350-450 parts of quick-setting and quick-hardening high belite sulphoaluminate cement, 50-150 parts of Portland cement, 0-30 parts of silica fume, 45-600 parts of river sand, 0-5 parts of a cement plasticizer, 0.3-5 parts of a defoaming agent, 1-5 parts of a retarder, 1-10 parts of a coagulant, 5-35 parts of a crystallizing agent, 1.5-10 parts of a nano nucleating agent and 15-60 parts of a binder. The compactness and crack resistance of the repairing material are improved; meanwhile, the coagulant and the nano nucleating agent are added, so that the early strength of the cement repairing material can be remarkably improved, the initial setting time of the cement repairing material is shortened, and the early compressive strength of mortar is improved, so that rapid repairing of a concrete pavement is realized, and compared with base concrete which is high in bonding strength, low in shrinkage and high in impermeability, and the freeze-thaw resistance is doubled compared with the standard requirement of the freeze-thaw resistance.

The invention belongs to the technical field of building materials, and provides a waste incineration fly ash-based high belite sulphoaluminate cement clinker and a preparation method thereof. The clinker is prepared from the following raw materials in parts by mass: 32.25 to 34.25 parts of waste incineration fly ash, 41.34 to 43.34 parts of carbide slag, 0.36 to 2.36 parts of ferric oxide and 22.05 to 24.05 parts of bauxite tailings. According to the method, the waste incineration fly ash serves as a preparation raw material, the fly ash contains high-content calcium sulfate and heavy metal ions, the components enter C2S mineral lattices in the calcination process, lattice distortion is caused, and the activity of C2S is improved. Meanwhile, heavy metal ions in the fly ash are effectively solidified in a clinker mineral structure, the leaching risk of heavy metal and environmental pollution are reduced, and harmless treatment of the fly ash is achieved. The waste incineration fly ash based high belite sulphoaluminate cement clinker prepared by the preparation method disclosed by the invention has excellent early compressive strength.

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.