Electrified accelerated corrosion reinforced concrete test device and method

Abstract

The invention relates to an electrified accelerated corrosion reinforced concrete test device and method. An electrolyte (2) in the device is placed in a box (1); a cathode (3) is placed in the electrolyte (2) and connected with the negative pole of a direct-current power supply (9) through a wire (6); a reinforced concrete test piece (4) is composed of concrete (10) and a steel bar (11) and placed in the wooden box (1); the steel bar (11) is connected with the positive pole of the direct-current power supply (9) through a wire (6) and serves as an electrified anode; a probe of a humidity monitor (5) is placed in the electrolyte (2); a resistor (7) is connected with wire (6) in a welded mode and connected with the steel bar (11) and the direct-current power supply (9) in series; a data recorder (8) is connected with the two ends of the resistor (7) through a wire (6). The method comprises the following steps that the reinforced concrete test piece is prepared and subjected to an electrified accelerated corrosion test. The feasibility and practicability of the test device and method are comprehensively evaluated through electrified corrosion efficiency calculation and steel bar corrosion product determination.

Description

technical field [0001] The invention relates to the test technology of reinforced concrete, in particular to the test technology of accelerated corrosion of reinforced concrete through electricity. Background technique [0002] Corrosion of steel bars can lead to cracking and spalling of the concrete cover, and even failure of structural members due to insufficient bearing capacity, which is one of the main reasons for the deterioration of the performance of reinforced concrete structures in service. Therefore, the study of steel corrosion is of great significance for the bearing capacity evaluation and service life prediction of reinforced concrete structures in service. However, the period of obtaining corroded steel members for research by natural exposure to corrosion is too long, which is not conducive to research. [0003] In order to obtain the corroded steel members in the laboratory for research as soon as possible, there are some rapid corrosion test methods, incl...

AI Technical Summary

Problems solved by technology

The immersion method, semi-immersion method or veneer method using salt solution as the electrolyte in the traditional electrification accelerated corrosion process has the characteristics of saving time and controlling the corrosion rate, but there are still some shortcomings: using salt solution as the electrolyte, when the crack develops to When the surface of the concrete and the steel bar is penetrated, the salt solution is easy to reach the surface of the steel bar, and the corrosion products are easy to seep out with the solution, thereby reducing the stress effect of the corrosion product on the concrete around the steel bar, which is not conducive to the development of cracks on the concrete surface; Oxygen deficiency, rust products are mainly black or dark green

Therefore, the traditional method of passing direct current to accelerate the corrosion of steel bars in concrete cannot simulate the natural corrosion of steel bars well.

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