4results about How to "Good retarding effect" patented technology

The invention discloses self-compacting concrete and a preparation method thereof, and relates to the technical field of concrete, and the concrete comprises cement, fly ash, mineral powder, water, sand, stone and a modified water reducer. The modified water reducing agent is a polymer prepared from a hydroxyl-containing monomer I, a double-bond-containing acyl chloride monomer II, an unsaturated polyether monomer III and a double-bond-containing monomer IV in a mass ratio of (0.5-1.5): 1: (9-12): 1 through esterification reaction and double-bond addition polymerization, and hydroxyl, carboxyl and a polyether side chain are introduced into a molecular chain of the polymer at the same time. According to the water reducer, through the synergistic effect of hydrogen bond stable adsorption, steric hindrance and electrostatic repulsion, the compressive strength of concrete is improved, the slump is reduced, the balance of super-long retarding and high-strength development is achieved, and the comprehensive performance is excellent.

This invention belongs to the field of high-efficiency concrete water-reducing agents, specifically relating to a composite polycarboxylate anti-mud water-reducing agent, its preparation method, and its application. The composite polycarboxylate anti-mud water-reducing agent comprises the following raw materials: 30-40 parts by weight of anti-mud polycarboxylate water-reducing agent and 1-3 parts by weight of anti-mud sacrificial agent. The anti-mud polycarboxylate water-reducing agent is polymerized from methyl allyl polyoxyethylene ether and unsaturated carboxylic acid under the initiator and chain transfer agent. The anti-mud sacrificial agent is obtained by adding 4-5 parts by weight of hydrogen peroxide to 20-30 parts by weight of papermaking black liquor. The anti-mud sacrificial agent effectively resists the interference of soil on the polycarboxylate water-reducing agent and is simple to prepare, environmentally friendly, and pollution-free. The composite polycarboxylate anti-mud water-reducing agent prepared by this invention has good anti-mud properties, exhibits good dispersibility in mud-containing concrete, and also has good slump retention properties.

The application discloses a preparation method and application of manganese gypsum, and the method is characterized by the following steps: uniformly mixing manganese sulfate residue, red mud, desulfurization ash and water, stirring into slurry, and aging for a period of time to obtain the product manganese gypsum which can be used as a cement retarder. In the application, the alkaline solid waste red mud and desulfurization ash are added to the manganese residue, and the calcium sulfite in the desulfurization ash is oxidized in the mixing process, thereby modifying the manganese residue and improving the sulfur content in the manganese gypsum and the retarding effect. The preparation method is simple, the manganese residue disposal amount is large, the manganese residue is innovatively prepared into the retarder required by cement production, and the preparation method does not need high-temperature treatment and does not consume electric energy, so that the energy consumption is reduced. Finally, the difficult-to-handle manganese residue, red mud and desulfurization ash are solidified and treated to prepare the retarder required by cement production, the manganese residue is converted into a resource which can be directly used in the building material industry, the resource utilization of the waste is realized, the application is simple and practical, and the purpose of reducing cost and increasing efficiency is achieved.

The application discloses a kind of quick repair mortar and preparation method thereof, according to weight fraction, quick repair mortar raw materials include coating modified magnesium oxide 300-500 parts, phosphate 100-150 parts, setting regulator 0-50 parts, quartz sand 300-600 parts, finely ground admixture 60-100 parts, rheological agent 5-20 parts.Each powder is mixed uniformly, and a proper amount of mixing water is added to stir uniformly and can be used.The application can reduce the reactivity of magnesium oxide at a lower calcination temperature by surface coating modification of magnesium oxide particles, thereby prolonging the operable time of magnesium phosphate cement-based repair material, and forming an in-situ polymer modified layer on the surface of magnesium oxide particles, enhancing the bonding performance of magnesium phosphate gel with other powders and aggregates.In addition, the application can utilize red mud, nickel slag and other harmful solid waste as resources, and the aluminum phase and iron phase can react with phosphate to form new mineral phases, improving the mechanical and durability properties of magnesium phosphate materials.