Corrosion test device and method for steel-concrete composite beam shear connectors

Abstract

The invention discloses a corrosion test device and method for a steel-concrete composite beam shear connector. The device includes a corrosion pool for containing electrolyte and soaking the concrete wing; the steel-concrete composite beam is used as an anode for electrolysis, It is mainly composed of steel beams, shear connectors and concrete, the shear connectors are welded on the steel beams, and the concrete is poured outside the shear connectors; the electrolytic circuit includes an ammeter connected to the anode, a DC power supply and a cathode . The method is to buckle the steel-concrete composite beam upside down in the corrosion pool, so that the electrolyte just soaks the concrete wing, turn on the power and record the current. The invention has a wider scope of application, is applicable to various shear connectors such as stud connectors and PBL connectors, and is more consistent with the actual situation, and can simulate the real corrosion situation of the shear connectors in steel-concrete composite beams.

Description

technical field [0001] The invention relates to a device and method for testing the corrosion resistance of materials, in particular to a corrosion test device and method for steel-concrete composite beam shear connectors. Background technique [0002] The mechanical properties of steel-concrete composite bridges are affected by environmental erosion. With the rapid development of my country's economic construction, energy consumption and industrial pollution are becoming more and more serious, and the acid rain area has reached more than 30% of the country's land area. In addition, a large number of deserts carried by sand and dust weather in the northern region, harmful ions in saline soil areas, and a large amount of chloride ions in salt fog in coastal areas all affect and threaten the durability of composite structures. During the construction of steel-concrete composite bridges, the steel in contact with the air is generally treated with anti-corrosion treatment, but ...

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Problems solved by technology

[0004] (1) The scope of application is relatively narrow, this method is only suitable for stud connectors, not for PBL connectors

[0005] (2) The current corrosion test method is to corrode the shear connectors first, and then pour concrete, which is inconsistent with the fact that the shear connectors in the actual bridge are corroded after pouring

[0006] (3) Under the current corrosion test method, the concrete is not affected in any way. However, in fact, the volume of the corrosion products of the shear connectors can expand to four times the original volume, which will generate pressure on the surrounding concrete, which will further crack and destroy the concrete.

[0007] (4) In the current corrosion test, the corrosion protection of steel beams is neglected

[0010] (2) There are relatively few studies on the corrosion of PBL connectors, so there is no specific test method at present

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