Multifunctional sensor for monitoring reinforced concrete structure erosion

Abstract

The invention discloses a multifunctional sensor that is used for monitoring the corrosion of a reinforced concrete structure, relating to a sensor, and provides a multifunctional sensor that is used for monitoring the corrosion of a reinforced concrete structure and can simultaneously monitor electrochemical corrosion parameters of carbonization of concretes, Cl<-> concentration, corrosion status and corrosion speed of reinforcement metals and the like on the spot, as well as a preparation method of the multifunctional sensor. The multifunctional sensor is provided with a metal shell, a Cl<-> probe, a pH probe, a reinforcement metal electrode, a MnO2 reference electrode and external guide lines. The Cl<-> probe, the pH probe, the reinforcement metal electrode and the MnO2 reference electrode are prepared separately, and then arranged in the shell. The external guide lines of each probe and each electrode are connected with and extend from the metal shell, each probe and each electrode are sealed and fixed with the metal shell, and insulating materials are exposed at the upper ends of each probe and each electrode and the ends exposing outside are covered by pervious materials; connecting parts between the external guide lines and the metal shell are sealed.

Description

technical field [0001] The invention relates to a sensor, in particular to a multifunctional sensor for monitoring the corrosion of reinforced concrete structures and a preparation method thereof. Background technique [0002] The corrosion of steel bars in concrete is one of the most important reasons affecting the durability and safety of concrete structures. Under the action of the environment, the carbonation of concrete and Cl - The erosion of corrosive species such as steel is an important factor causing corrosion of steel bars. The damage of engineering structures caused by corrosion of steel bars often causes heavy losses and even serious accidents. Due to carbonation of concrete and Cl - Once corrosion of reinforcement caused by intrusion has occurred, it is often difficult and costly to repair. If effective on-site real-time detection technology can be used to track and monitor the reinforced concrete engineering structure throughout the process, and to closely ...

AI Technical Summary

Problems solved by technology

However, this kind of on-site sampling analysis will inevitably cause certain man-made damage and damage to the concrete structure, the monitoring parts are very limited, the measurement is time-consuming, and it is difficult to realize real-time monitoring

At present, some patents and documents at home and abroad have proposed the use of corrosion sensors to monitor the corrosion of steel bars in concrete. The distance from the dangerous front of the intruding medium to the steel bar in the working environment, but this method is only a qualitative measurement of the corrosion state of the steel bar, and cannot obtain the Cl in the concrete - Important information such as concentration, pH and rebar corrosion rate

Zhao Yongtao (CN 1900691A) provided a steel bar corrosion detection device, which used the charge pulse polarization method to measure the corrosion parameters of the steel bar, which overcomes the problem that the polarization measurement is easily affected by the high resistance of concrete, and can simultaneously monitor Cl - concentration, M.F. Montemor et al. (Cement & Concrete Composites 28 (2006) 233-236) used Cl - Probe array detection of Cl under the influence of environment - Penetration Behavior in Concrete; M.Raupach et al. (NDT&E International 34(2001) 435-442) Detecting Corrosion State of Steel Reinforcement Using a Macrocell Sensor; H.S.Lee et al. (Materials and Corrosion 54, 299-234(2003)) Use resistance sensors to detect the corrosion state of steel bars and the transmission behavior of corrosive media; however, it is impossible to monitor concrete carbonation, Cl - More comprehensive information on corrosion electrochemical parameters such as concentration, steel corrosion state and corrosion rate

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