Concrete chloride ion permeation property quick rust testing method

Abstract

This invention introduces a concrete chloride ion permeability fast - corrosion testing method is: put the concrete specimen has a network-reinforced in the middle in the NaCl and 0.3 M NaOH, distilled water preparation and 3.0% in the chemical percentage of pure quality NaCl, and 0.3 M NaOH aqueous solution mixed, in the environmental temperature was 23 or so, with NaCl solution should be soaked every one week replacement once, in the testing process after inspection and test soaking solution of NaCl concentration of 60 +- 0.1 volts the plus DC, in the test cycle, not more than 24 hours in regular record current value, and growth of over 10% / 24 hours, the application of NT BUILD 208, AAHSTO T260 accurate determination of concrete powder samples of the acid chloride Cl-content, chlorine ion concentration measurement accuracy should reach 0.001%.

Description

technical field [0001] The invention relates to a quick-corrosion test method for chloride ion permeability of concrete, which belongs to the category of concrete performance test and evaluation technology. Background technique [0002] Concrete is the most commonly used building material in modern human production and life. As a multiphase heterogeneous material, it has a porous structure from a microscopic point of view, and media such as water, gas, and ions penetrate into the concrete through these pores. Although the durability of concrete includes many contents, and these contents are affected by many factors, and the mechanism of action is complex, but the common point is that they are all related to the mass transfer capacity of concrete. Most of the corrosion of concrete materials occurs under the condition of intrusion of water and harmful ions, and the durability of concrete is closely related to its permeability. It is generally believed that the lower the perm...

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Problems solved by technology

Among them, the natural migration method more realistically simulates the actual situation of chloride ion migration, but the test period is longer. The electrical / electrochemical method shortens the test period by accelerating the electric field, but it cannot fully reflect the natural migration of chloride ions in concrete. None of these aspects is directly related to the corrosion of steel bars; the constant voltage steel bar corrosion method reflects the performance of concrete to protect steel bars, but it can only be compared qualitatively and cannot quantitatively describe the migration of chloride ions in concrete and their aggregation on the surface of steel bars to cause corrosion the process of

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