Method of using ground penetrating radar to detect corrosion of steel bars in ferroconcrete components

Abstract

The present invention discloses a method of using ground penetrating radar to detect corrosion of steel bars in ferroconcrete components. The method comprises the following steps. Firstly, a ground penetrating radar is used to emit an electromagnetic wave toward a ferroconcrete component. Then, a reflected electromagnetic wave is received. The reflected electromagnetic wave is calculated to obtain characteristic parameters from the interface of the steel bar and the concrete, wherein the characteristic parameters includes reflection electric potential, specific resistance and corresponding specific electric current from the interface. Reference characteristic data which include reference thicknesses of the concrete versus reference reflected electric potential, specific resistance and corresponding specific electric current from the interface are provided. The obtained interface characteristic parameters and the thickness of the concrete are compared with the reference characteristic data to derive the corrosion condition of steel bars in the ferroconcrete component.

Description

technical field [0001] The invention relates to a detection method using ground-penetrating radar, in particular to a non-destructive detection method using ground-penetrating radar. Background technique [0002] Reinforced concrete is a component commonly used in buildings, bridges, water conservancy facilities, etc. It is completed by pouring concrete and steel bars in one piece. However, the subtropical maritime climate makes Taiwan an environment with extremely high humidity, forming corrosion of reinforced concrete. One of the culprits. [0003] Although reinforced concrete has a layer of passivation mode on the surface of the steel bar in the early stage, which can protect the surface of the steel bar from corrosion, but if the reinforced concrete is placed in an environment with high humidity for a long time, the passivation mode on the surface of the steel bar will be gradually destroyed. Corrosion of steel bars also occurs. Once the steel bars produce corrosion pr...

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Problems solved by technology

[0005] Taiwan patent I265287 discloses a method for detecting steel bar corrosion. In this method, a sensor with a Bragg grating must be placed at an appropriate place of the steel bar. However, for reinforced concrete that has been formed, unless the concrete is destroyed, the sensor cannot be placed on the steel bar. Appropriate place

Otherwise, the sensor should be pre-placed before the reinforced concrete is formed, but the aforementioned pre-placed sensor will be affected by the thermal expansion and contraction of the environment, which will affect the change of the reflected wave, resulting in misjudgment

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