Test device and test method of chloride ion penetration in concrete beam

Abstract

The invention discloses a test device and a test method of chloride ion penetration in a concrete beam. The test device comprises a first loading unit, a first force measurement unit, a second loadingunit, a second force measurement unit, a drying and watering cycle device, a water tank and a bottom plate; a test piece is arranged on the bottom plate; the drying and watering cycle device comprises a plurality of spray nozzles connected with a water outlet valve of the water tank, and a plurality of exhaust fans opposite to the test piece; the first loading unit, the first force measurement unit, the second loading unit and the second force measurement unit are arranged around the test piece; and the first loading unit and the first force measurement unit are oppositely arranged on both sides of the test piece, the second loading unit and the second force measurement unit are oppositely arranged on the both sides of the test piece, and the first loading unit and the second loading unitare vertically arranged. The test device disclosed by the invention can perform multiple drying and watering cycles while applying a biaxial continuous load, the test result is accurate, and the chloride ion diffusion law of the concrete beam test piece under the coupling of the biaxial continuous load and the drying and watering cycle can be studied accurately.

Description

technical field [0001] The invention belongs to the technical field of engineering material structure durability, service life and mechanical test, and in particular relates to a test device and a test method for chloride ion penetration in concrete beams under the coupling action of biaxial continuous load and dry-wet cycle. Background technique [0002] It is a very important research method in construction engineering to study structural durability through concrete chloride ion diffusion model test or indoor test, such as simulating seawater environment, and studying the law of chloride ion diffusion in concrete under the action of dry-wet cycle. Changes in the concentration of chloride ions in concrete were tested by alternating wetting and drying. [0003] In practical applications, many experiments need to simulate the real marine environment to analyze the distribution of chloride ions in concrete structures. Many dry-wet cycle test devices currently used in China pl...

AI Technical Summary

Problems solved by technology

At present, many dry-wet cycle test devices used in China place concrete beams in a dry-wet cycle box, and then carry out continuous loading after the dry-wet cycle is completed, which is inconsistent with most engineering practices

In addition, most cheap biaxial continuous loading devices are connected by welding. Due to the welding stress and the inaccurate positioning of the steel plate, the resultant force in the biaxial loading direction and the respective reaction forces are not on the same straight line. The biaxial loading test The device has an eccentric loading effect, so that the test device exerts a torque on the specimen during the loading process, thereby generating shear stress, and the original simple axial stress state will be transformed into a complex stress state, while the general common specimen is more As a brittle material, it is more sensitive to shear stress and tensile stress. Therefore, due to the shear stress generated by the torque on the specimen, the failure strength of the specimen is lower than that under axial stress, resulting in the same load. The deformation of the specimen is greater than that under the axial stress state, and the overall mechanical properties of the specimen are reduced, which has a great influence on the test results

Furthermore, after the dry-wet cycle, the strength of the test piece will be affected to a certain extent, and then the continuous load will affect the penetration test of the continuous load and the coupling effect of the dry-wet cycle.

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