Device and method for measuring corrosion rate of steel bar

Abstract

The invention discloses a device and method for measuring the corrosion rate of a steel bar. The device for measuring the corrosion rate of the steel bar comprises a steel bar fixing system, a liquid filling and discharging system and a measurement and control system. The underwater penetration of the steel bar to be measured is changed by continuously injecting water into a liquid container of the liquid filling and discharging system, the water level and force are acquired in time, and a curve chart of the local corrosion rate, in the length direction, of the steel bar is obtained by processing the water level and the force in a unified mode through a single-chip microcomputer. According to the device and method for measuring the corrosion rate of the steel bar, the measurement precision is high, the measurement efficiency is high, the method and device are suitable for long steel bars, automatic control can be achieved, the local corrosion rate of the steel bar can be measured accurately, and the curve chart of the corrosion rate, in the length direction, of the steel bar can be drawn.

Description

technical field [0001] The invention relates to the measurement of steel bar corrosion rate, in particular to a steel bar corrosion rate test device and a test method, which belong to the technical test device in the field of concrete construction. Background technique [0002] In the field of civil engineering, steel bars and concrete are currently the most widely used building materials in the world. A large number of building structures are made of reinforced concrete, but due to concrete carbonation and chloride corrosion, steel bars will be corroded. Corrosion of steel bars in concrete is one of the main causes of premature failure of concrete structures. Corrosion of steel bars reduces the safety and durability of structures, leading to different degrees of durability problems in concrete structures: such as cracking of concrete structures, internal Corrosion of steel bars, freeze-thaw cycles, and alkali-aggregate reactions reduce the bearing capacity and service life ...

AI Technical Summary

Problems solved by technology

[0002] In the field of civil engineering, steel bars and concrete are currently the most widely used building materials in the world. A large number of building structures are made of reinforced concrete, but due to concrete carbonation and chloride corrosion, etc., steel bars will be corroded.

Corrosion of steel bars in concrete is one of the main causes of premature failure of concrete structures. Corrosion of steel bars reduces the safety and durability of structures, leading to different degrees of durability problems in concrete structures: such as cracking of concrete structures, internal Corrosion of steel bars, freeze-thaw cycles, alkali-aggregate reaction, etc. reduce the bearing capacity and service life of the building, causing structural durability failure

Although the test device of this invention can measure the corrosion rate of steel bars along the length direction, there are many problems as follows: the amount of corrosion of steel bars itself is a very small value, which requires very accurate measurement; It will bring measurement errors; adopting the manual adjustment and visual inspection of steel bars in the present invention to measure corrosion, not only the operation process is cumbersome, the detection efficiency is low, but also a large error will occur; the fixed frame adopts a cantilever structure, resulting in A certain eccentricity may lead to a certain measurement error; the quality weighed by the weighing instrument includes the mass of the steel bar and the fixed frame, so the measuring range of the weighing instrument needs to be large enough; the force change caused by each drop h of the steel bar is small, Therefore, the accuracy of the weighing instrument needs to be high enough, and the manufacture of a weighing instrument with a large range and high precision requires high technical requirements.

The weighing instrument that this invention adopts measures the total mass of the water in the liquid container and the overflow container, and cannot reflect the change of force; Small, the height of each drop is small, so there is very little spilled liquid, a small amount of liquid will adhere to the outer wall of the liquid container and not directly flow into the overflow container, resulting in a large error in the final measurement; one end of the steel bar is clamped Under the steel clamp, the other end is immersed in the liquid, which is not conducive to measuring long steel bars. For example, when the measured steel bar length is 2m, the height of the device must be at least 4m, and the height of the device is too high, which is not conducive to the stability of the device. , It is also not conducive to human operation; the lifting system adopts pure electric control, which is not conducive to the micro-adjustment of displacement, that is, it cannot guarantee that the displacement has sufficient accuracy

[0008] In summary, there is no satisfactory measuring device and method for steel corrosion rate in the prior art

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