Concrete permeability coefficient testing apparatus and method under actions of dry-wet cycle and tensile stress

Abstract

The present invention relates to a concrete permeability coefficient testing apparatus and method under actions of a dry-wet cycle and a tensile stress, characterized by that the concrete permeabilitycoefficient testing apparatus under actions of a dry-wet cycle and a tensile stress comprises a stretching apparatus applied to formed concrete blocks and a dry-wet cycle permeability apparatus applied to formed concrete blocks. The concrete permeability coefficient testing apparatus under actions of a dry-wet cycle and a tensile stress can be used to relatively authentically reflect a chloridionpermeability behavior under an actual dry-wet cycle action.

Description

Technical field: [0001] The invention relates to a device and method for testing the permeability coefficient of concrete under the action of dry-wet cycle and tensile stress. Background technique: [0002] Concrete structure is one of the most widely used structural forms in construction engineering structures, but some structures are prematurely damaged due to various reasons and cannot reach the predetermined design service life. In addition to insufficient structural design resistance, more The reason is due to the lack of durability of the structure. According to the summary and analysis of the durability failure cases of concrete structure engineering in the world, it is generally believed that chloride salt is the main reason affecting the corrosion of steel bars inside the concrete. Although there have been decades of research on the durability of concrete with chloride salts, the research work is more concerned with the durability under the action of a single chlor...

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Problems solved by technology

[0004] At home and abroad, there are certain studies on the durability of concrete under the action of tensile stress, which mainly focus on the research under the action of bending load. Stretch is a test at a high stress level, due to the stress relaxation characteristics of the spring, causing errors in the test

Some scholars also use a fast chloride ion permeation device to measure the chloride ion permeability coefficient under the action of stretching, but this does not truly reflect the chloride ion permeation behavior under the action of the actual dry-wet cycle. From the currently collected literature, there is no relevant Scholars proposed a similar device, but it is of great significance to evaluate the durability of concrete structures

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