Nondestructive testing method for mixing amount of steel fibers in concrete

Abstract

The invention relates to a nondestructive testing method for the mixing amount of steel fibers in concrete, which comprises the following steps of firstly, scanning and quantifying a steel fiber concrete standard test piece to obtain a relational graph of the mixing amount of the steel fibers and electromagnetic signal values, and determining electromagnetic signal value ranges corresponding to different mixing amounts of the steel fibers based on the relational graph of the mixing amount of the steel fibers and the electromagnetic signal values, and finally, detecting the actual electromagnetic signal of the concrete to obtain the internal steel fiber mixing amount. Compared with an existing concrete nondestructive testing method, the method has the advantages that the steel fiber mixing amount in the concrete can be quantitatively detected, and the construction quality is more effectively improved, guided and controlled.

Description

technical field [0001] The invention belongs to the field of nondestructive testing of concrete structures, and relates to a nondestructive testing technology for steel fiber content, in particular to a nondestructive testing method for steel fiber content inside concrete. Background technique [0002] Steel fiber reinforced concrete is obtained by adding short steel fibers into conventional concrete in an appropriate proportion and distributing them randomly. Strength is the design index of the structure. The role of steel fibers in reinforced concrete is similar to that of "small steel bars". By being evenly distributed in concrete, the strength and other physical properties of concrete are enhanced. The random distribution of steel fibers in concrete can effectively prevent micro-cracks inside the concrete. The expansion and the appearance of macroscopic cracks have significantly improved the tensile, bending, impact and fatigue properties of concrete, and have good duct...

AI Technical Summary

Problems solved by technology

If the construction control of the steel fiber content inside the concrete members with crack resistance requirements does not meet the standard requirements of the code design, it will seriously affect the service life and durability of the concrete structure

[0003] At present, the current method of non-destructive testing of steel fiber reinforced concrete structures cannot quantitatively detect the amount of steel fiber, which limits its practical application.

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