System and method for testing diffusion performance of chloride ions in concrete under action of biaxial pressure

Abstract

The invention relates to a system for testing diffusion performance of chloride ions in concrete under the action of biaxial pressure. The system comprises a biaxial compression loading device and anelectric acceleration rapid chlorine ion migration device, wherein the biaxial compression loading device is mainly formed by a steel base plate, a hollow steel plate (8), a hydraulic jack I (1) and ahydraulic jack II (2); the electric acceleration rapid chlorine ion migration device is mainly formed by an anode experiment tank (26), a cathode experiment tank (24) and a round water storage tank.On this basis, an inventor researches relation models of the size of the hollow steel plate, the steel type, the thickness of the steel base plate, the heights of the jacks and the bearing capacity ofthe jacks, and provides a theoretical basis for the design of the biaxial compression loading device. Accordingly, the inventor establishes a corresponding testing method, and the testing system disclosed by the invention can be used for testing the diffusion performance of the chloride ions in the concrete under the action of continuous biaxial pressure, and a DIC image processing technology iscombined, so that the testing system can be used for the relation between the stress and a chlorine ion diffusion coefficient.

Description

technical field [0001] The invention belongs to the technical field of concrete chloride ion migration coefficient measurement, in particular to a concrete chloride ion diffusion performance test system and method thereof under the action of biaxial pressure. Background technique [0002] Steel bar corrosion is the main factor causing concrete structure damage, and chloride ion corrosion is the main factor causing steel bar corrosion. Therefore, chloride ion attack is an important basis for characterizing the durability of concrete structures. A lot of research has been done on the determination method of the chloride ion penetration resistance of concrete structures at home and abroad, and relevant experimental procedures have been formulated. At present, the electric flux method and the rapid chloride ion migration method (RCM method) are mainly used to express the performance of concrete against chloride ion penetration. The electric flux method is used to apply a 60V D...

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Problems solved by technology

However, these two experimental methods cannot realize the application of various loads at the same time as the test. In actual situations, concrete specimens are often subjected to coupling effects of loads and various environmental factors. After unloading, the cracks or gaps in the specimens become smaller or completely closed. , which affects the transmission and diffusion of chloride ions inside the concrete structure, that is, the permeability of chloride ions

[0003] Chinese patent "loading device and test method for concrete chloride ion permeability test" (patent number 200910212680.2 publication date 20100602) discloses a loading device and test method for concrete chloride ion permeability electrometry test under biaxial compression load, but the experiment The device uses the electric flux method to evaluate the permeability of concrete chloride ions, and the migration coefficient of concrete chloride ions cannot be obtained, only the electric flux that characterizes the permeability of concrete can be obtained

[0004] To sum up, the current test device and method for testing the chloride ion diffusion performance of concrete under the action of continuous biaxial pressure using the principle of rapid chloride ion migration are still blank in China.

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