Concrete with large doped quantity of mixed steel fibers and preparing method

Abstract

The invention relates to a method for preparing concrete with a large doped quantity of mixed steel fibers. The concrete comprises a binding material, water, mixed steel fibers and a water reducing agent, wherein the binding material is prepared from cement and fly ash, and the mixed steel fibers contain more than two steel fibers in different sizes. The steel fiber concrete with high strength and the functions of crack resistance and the like can be produced, the volume doped quantity of the steel fibers can reach 6% and more, the problem that agglomeration easily occurs when the doped quantity of the steel fibers in the concrete is large is solved, and the compressive strength of the concrete can be improved by 50% above. The mixing ratio is reasonably designed, efficient and feasible. The method is particularly suitable for steel fiber concrete with strict strength and impact-resistant requirements.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to steel fiber concrete; the concrete can be widely used in bridge structure and bridge deck engineering, railway sleepers, underground cavern support and the like. Background technique [0002] Steel fiber concrete is a new type of concrete composite material formed by adding an appropriate amount of steel fiber to ordinary concrete. Compared with ordinary concrete, the mechanical properties of steel fiber concrete are significantly improved, and its tensile strength can generally be increased by about 2 times. , the improvement of impact strength is more obvious. At the beginning of the last century, American scholars improved the strength and stability of ordinary concrete by researching the addition of steel fibers. Since then, the United States, Britain, France, Germany and other countries have issued steel fiber concrete patents one after another. The research on...

AI Technical Summary

Problems solved by technology

In fact, a single change of fiber characteristics, such as increasing the aspect ratio and improving the shape of the fiber, has achieved some results, but it is not ideal, because increasing the aspect ratio makes it easier to agglomerate during stirring, thereby reducing the dosage

At present, in order to overcome the defects of the fiber spacing theory - ignoring factors such as the composite reinforcement effect of fibers and the coupling effect produced by multiple fibers, some scholars have mixed a single steel fiber with other fibers and achieved ideal results, but the steel fiber The dosage is still low due to its length-to-diameter ratio

These unfavorable factors have seriously restricted the development of steel fiber concrete, especially when the content of steel fiber is greater than 3%, the steel fiber concrete prepared by the current technology and process will appear serious agglomeration phenomenon