Long term monitoring sensor for steel bar corrosion in steel concrete member

Abstract

The long term monitoring sensor for corrosion of steel bar in steel concrete member consists of electrode rods in the same length, pedestal, wires and sacrificed anode. The electrode rods are fixed in the sensor pedestal in stepped form, and the wires are connected through leaf springs to the anode and cathode of the electrode rods. During construction, the monitoring sensor is embedded into the concrete for subsequent regular data acquisition. In the case of finding out corroded steel bar in some electrode rod, the steel bar is protected via the cathode protector. The present invention can perform non-destroying detection of the steel bars in different depth and determine the frontal surface distance of the invading corrosive medium.

Description

technical field [0001] The invention relates to a sensor for long-term monitoring of steel bar corrosion in reinforced concrete components, which can perform long-term detection of steel bar corrosion in reinforced concrete components in a chlorine-containing environment without damaging the concrete surface, and is applied to the durability of reinforced concrete structures in the field of structural engineering detection and evaluation. Background technique [0002] Corrosion of steel bars in reinforced concrete is one of the main factors affecting the durability of structures. Compared with the corrosion of steel bars caused by carbonation of the concrete cover, the corrosion rate of steel bars caused by chloride ion invasion is faster (about 10 times the corrosion rate of steel bars caused by carbonization), and the loss is greater, which has caused engineering and academia. extensive attention. [0003] At present, the control of the concentration of chloride ions in ...

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Problems solved by technology

Since general corrosion has the characteristics of a large cathode and a small anode, the same cathode and anode area does not conform to the actual situation

[0009] 3. After the steel bar in the sensor is corroded, since the corrosion product occupies a larger volume than the corroded steel, the expansion effect will damage the concrete protective layer, increase the permeability of the concrete at the test site, and have a greater impact on the monitoring results

[0010] 4. Without fixing device, it is difficult to locate the sensor when pouring concrete

[0011] 5. The volume is large, and it is not easy to insert and locate in the reinforcement mesh (especially when the reinforcement arrangement is dense)

[0012] 6. The sides of steel bars and stainless steel rods need to be sealed, the process is complex and easy to be damaged during construction, which will affect the monitoring results

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