5results about How to "Increase slump" patented technology

The application discloses a preparation method of low-shrinkage low-heat low-carbon concrete, and has the technical characteristics that high-water-absorption autoclaved silicate functional aggregate is used to replace gravel and yellow sand, and the mass sum of fly ash and mineral powder in the cementing material can be up to 60% at most. The high-water-absorption water-saturated autoclaved silicate functional aggregate and the expanding agent are added into the concrete, the humidity is released through the functional aggregate, the internal curing and the expansion of the expanding agent are cooperated, the self-shrinkage, the drying shrinkage and the hydration heat shrinkage of the concrete are reduced, and the strength of the concrete is improved; the grading of the fine aggregate of the superfine yellow sand is improved through the addition of the fine functional aggregate, the working performance of the concrete is improved, and the low-carbon environmental protection of the concrete is realized through the large amount of mineral admixtures.

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 provides a preparation process of concrete with tunnel hole slag as raw material. The preparation process of concrete with tunnel hole slag as raw material comprises the following steps: crushing the tunnel hole slag and performing primary screening; finely crushing and preparing machine-made sand through a single production process; dry mixing main materials such as cement; mixing basalt fibers and polypropylene fibers; and preparing a mixed solution and stirring and mixing. The application can improve the impermeability and frost resistance of the prepared concrete by mixing and doping basalt fibers and polypropylene fibers which have acid and alkali resistance.

The application discloses a kind of low additional water full recycled concrete based on recycled fine aggregate wet packing gradation optimization and preparation method thereof, belong to building material technical field.The application is classified into three intervals by natural gradation recycled fine aggregate, after pre-wetting to saturated surface dry state, the wet loose bulk density under each mass proportion combination is determined, and the highest density is selected as the optimal artificial gradation;60% of the saturated surface dry water absorption of all recycled aggregates is determined as additional water;cement, recycled fine aggregate, recycled coarse aggregate, initial water and water reducing agent are used to prepare by using the layered feeding process of "cement pre-mixing→ neat paste preparation→ coarse aggregate→ fine aggregate".The obtained concrete has a slump of 160-190mm, a 28-day compressive strength of 25-40MPa, good fluidity, can meet the construction requirements of conventional concrete structure, and does not need chemical modification, low cost, suitable for building solid waste large-scale utilization.

The application relates to a graphene oxide strong agent and a preparation method and application thereof, and raw materials for preparing the graphene oxide strong agent include a graphene oxide dispersion liquid, modified starch, polyethylene glycol, hydroxypropyl methyl cellulose, a polycarboxylic acid water reducing agent and water. Graphene has excellent mechanical properties and can be used as a filler to increase the compactness of concrete, but is limited in the application in concrete due to dispersion problems. A special dispersant is selected in the application, which can fully disperse graphene oxide to form a stable solution, prevent adsorption of graphene on a water reducing agent, and even maintain the stability of the solution after being compounded with other materials, so that the workability of concrete is improved and the strength of the concrete is improved.