Lightweight high-strength concrete and preparation method thereof

Abstract

The invention discloses a preparation method of a lightweight high-strength concrete. By using aluminum silicate ceramic fibers, concrete is prevented from cracking, the expansion of macroscopic cracks is prevented, the peeling and separating capacity of the concrete for resisting freeze-thaw cycle is improved, the compressive and flexural strength of the concrete is improved by using auxiliary agents, and the concrete has the characteristic of light weight by using prepared modified fly ash; according to the preparation method, a prepared concrete semi-finished product is crushed and refinedby using a crushing and refining device; according to the crushing and refining device, a concrete semi-finished product is crushed through a slitting knife, a first shearing blade and a second shearing blade, the particle size is reduced; the semi-finished concrete is sheared and dispersed by the stirring and shearing blades, and the part with a smaller particle size is extracted by wind power generated by an air blower, so that the prepared light high-strength concrete is small in particle size, the specific surface area is reduced, the void ratio is reduced, the bonding strength is improved, and the concrete quality is improved.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a preparation method of lightweight high-strength concrete. Background technique [0002] In recent years, driven by building energy-saving policies, building energy-saving technologies and energy-saving materials have developed rapidly. Concrete is the most widely used building material in the construction industry. With the development of the economy and the advancement of technology, people's requirements for building materials are also constantly increasing. Not only does the concrete require high strength and durability, but the concrete should also meet the requirements of light weight and environmental protection. requirements. At present, the most common concrete used in industrial and civil buildings, although its strength (generally 20-30MPa) can basically meet the requirements of building structures, is relatively heavy. However, ordinary concrete and air-entrained concrete a...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above-mentioned technical problems, the object of the present invention is to provide a preparation method of lightweight high-strength concrete: (1) prevent concrete from cracking by using aluminum silicate ceramic fibers, prevent the expansion of macroscopic cracks, and improve the strength of the concrete. Resistance to peeling and separation of freeze-thaw cycles, through the use of additives, the compressive and flexural strength of concrete is increased, the anti-rust performance, waterproof and anti-seepage performance of concrete are improved, and it also has good water reduction, workability and plasticity And pumpable effect, by using liquid nitrogen to pass into the reaction kettle filled with fly ash and water, pressurize the inside of the reaction kettle, release the pressure after maintaining the pressure, so that the material in the reaction kettle is sprayed into the barrel, and the liquid nitrogen is in the During the pressurization process, part of the liquid nitrogen can be allowed to enter the inside of the fly ash particles with fewer pores. Smaller and finer debris, this process can instantly increase the pores on the surface of fly ash particles. It is the effective retention of the hollow and porous fly ash microsphere structure, which can be dispersed inside the system as a hollow porous skeleton, solving the problem of The problem of low strength and heavy quality of the existing concrete is solved; (2) The semi-finished concrete product is crushed and refined by using the crushing and refining device, and the semi-finished concrete is put into the storage box from the feed port, and the rotating The mixing shaft stirs the semi-finished concrete and disperses it on the cutting knife. The rotating cutting knife cuts and crushes the semi-finished concrete. In the second conveying pipe, the semi-finished concrete is cut by the first shearing blade and transported forward to the feed box, and the semi-finished concrete falls into the inner cavity of the sorting box through the receiving hopper, and the stirring and shearing blade is driven to rotate by the operation of the stirring motor , start the blower, the blower runs to generate wind, and the rotating mixing and shearing blades further cut and disperse the semi-finished concrete, and the wind generated by the blower carries part of the semi-finished concrete out of the discharge pipe to obtain the lightweight high-strength concrete. The existing concrete is easy to form blocks during the production process. When used, the void ratio is large, the joint strength is low, and the quality is poor.

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