Modified polypropylene fiber-steel fiber doping high-intensity concrete and preparation method thereof

Abstract

The invention discloses a preparation method of modified polypropylene fiber-steel fiber doping high-intensity concrete. The preparation method is characterized in that waste and old tires are mechanically crushed and sieved to obtain waste and old rubber powder; silane coupling agents are added into an alcohol solution; after the hydrolysis, the material is uniformly sprayed onto the surface of the rubber powder; the material is sufficiently mixed; after the treatment in microwaves, a sodium hydroxide solution is used for soaking; then, drying is performed in a baking oven; the modified rubber powder is obtained; polyvinyl alcohol and distilled water are mixed; water bath heating melting is performed; polypropylene fiber is added; uniform ultrasonic dispersion is performed; soaking treatment is performed; drying is performed to obtain the surface treatment polypropylene fiber; a gelling material is finely ground through machinery and is then mixed with Portland cement, steel fiber andnaphthalene-based efficient water reducing agents; the mixture is added into a stirring machine; the obtained material is added; then, sand and tap water are added; stirring is performed for uniformscattering; slurry is obtained; slurry is poured into a mold; scraping leveling is performed by a scraper; after the shaping, still standing is performed; then, mold stripping is performed; standard maintenance is performed; the drying is performed in the ventilation drying place; high-intensity concrete is obtained.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a method for preparing high-strength concrete doped with modified polypropylene fibers and steel fibers. Background technique [0002] High-strength concrete is an important development direction of concrete materials because of its high strength, elasticity [0003] Due to the advantages of large modulus and small deformation, it has been more and more widely used, but one of its more prominent shortcomings is that it is prone to bursting at high temperatures, which will lead to the shedding of concrete, the exposure of steel bars, and the decline in the bearing capacity of structural members. , There may even be serious consequences of structural collapse. In recent years, some studies have been done on improving the high-temperature burst performance of high-strength concrete at home and abroad. Contents of the invention [0004] The technical problem mainly solved by the inven...

AI Technical Summary

Problems solved by technology

[0003] Due to the advantages of large modulus and small deformation, it has been more and more widely used, but one of its more prominent shortcomings is that it is prone to bursting at high temperatures, which will lead to the shedding of concrete, the exposure of steel bars, and the decline in the bearing capacity of structural members. , there may even be serious consequences of structural collapse