Concrete strength detection method based on electromagnetic properties of material

Abstract

The invention discloses a concrete strength detection method based on the electromagnetic properties of a material. The concrete strength detection method comprises the following steps: preparing a concrete test piece with a mix ratio identical to the mix ratio of actual structural concrete and carrying out maintenance for 28 d under conditions identical to maintenance conditions of the actual structural concrete; carrying out nondestructive test on the concrete test piece by using a ground penetrating radar according to a reflection method or transmission method; calculating the relative dielectric constants of the concrete test piece according to the propagation time of electromagnetic waves in the concrete test piece, carrying out detection a plurality of times and taking an average value of the calculation results; and acquiring concrete strength according to a curve model of the correlation between the relative dielectric constant and strength of concrete established on the basis of experiments. The invention has the following characteristics: radar nondestructive testing technology is employed; original structure is not damaged; testing precision is high; the speed of testing is fast; the test piece is simple to prepare; since the mix ratio and maintenance conditions of the test piece and the actual structural concrete are identical, detection results are genuine and believable; and the method has wide applicability.

Description

technical field [0001] The invention belongs to the technical field of detection of concrete building materials, and relates to a method for detecting the strength of concrete materials, and more specifically, relates to a method for detecting the strength of concrete based on the electromagnetic properties of materials. [0002] The method of the invention is mainly used in the field of concrete structure engineering detection, such as the detection and identification of concrete strength in concrete mixing stations, building construction sites and other test sites. Background technique [0003] Concrete strength refers to the actual strength of concrete after pouring and curing. Strength is an important indicator of concrete material performance and a basic parameter for the design of reinforced concrete engineering structures. The design of concrete structures is based on the concrete design strength data provided by the "Code for Design of Concrete Structures" combined wi...

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Problems solved by technology

The pull-out method uses the tensile strength of the concrete to estimate the compressive strength of the concrete through the pull-out test, and its accuracy is higher than that of the rebound method and the ultrasonic rebound comprehensive method, but there is also a certain error (about 12%). The method is to use special coring equipment to drill concrete core samples on concrete components, and conduct compressive strength tests to directly measure the strength of concrete according to the prescribed methods. The actual strength of the concrete, but the drill core sampling will cause a certain degree of damage to the structure, especially in the key parts of the structure that are under a large force.

Drilling core sampling method needs to drill concrete core samples, the work efficiency is low, and it is not suitable to test the strength of concrete in large quantities

[0009] It can be seen from the above that none of the methods used for concrete strength testing in the prior art can truly reflect the actual strength of concrete, and may cause damage to the concrete structure

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