Three-dimensional tensile pressure-high hydraulic gradient action concrete dissolution test device and method

Abstract

The invention discloses a three-way tensile pressure-high hydraulic gradient action concrete corrosion test device and method. The method comprises applying constant compressive stress to a specimen through forward preload, applying reverse preload to a tensile steel plate bonded to the surface of the specimen and tensile bolts through a seal chamber steel plate in the tension side as a reverse force structure to realize constant tensile stress loading, applying axial compressive stress to a loading bar with a protection shell along a longitudinal direction, monitoring the stress state of the specimen in the corrosion process through tension and pressure sensors and supplying preload and axial pressure in good time. Through combination of sealing of the specimen tension side with the structure glue and a high elastic rubber tube, the pressure solution flows into the specimen from the top and flows out of the specimen from the bottom so that hydraulic gradient action is formed, and a water pressure sensor monitors corrosion solution pressure in the solution chamber in the corrosion process and supplies the solution in good time to keep stable pressure. In the solution chamber, one or more osmotic corrosion environments such as sulfate and chloride environments are provided. The device has a string structure and can carry out three groups of tests simultaneously.

Description

technical field [0001] The invention belongs to the technical field of simulation tests, and in particular relates to a concrete corrosion test device and method under the action of three-way tension pressure and high hydraulic gradient. Background technique [0002] The stress state of hydraulic concrete structures is complex, generally in a three-dimensional stress state, and there are tensile and compressive stresses. The stress state is closely related to the porosity. When the compressive stress is small, the concrete pores are closed and the dissolution is inhibited. When the compressive stress is large or there is tensile stress, the pores open and the dissolution is accelerated. Hydraulic concrete interacts with environmental water for a long time, and the stress state is complex. The corrosion effect and the deterioration of the structure by aggressive ions (sulfate and chloride ions) cannot be ignored. Under the simultaneous action of complex stress conditions and...

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Problems solved by technology

[0004] In order to solve the problem in the prior art that the chemical erosion characteristics of hydraulic concrete cannot be studied simultaneously in the state of continuous three-dimensional tensile and compressive stress and high hydraulic gradient state, the present invention provides a three-dimensional tensile pressure-high hydraulic gradient effect concrete dissolution Test device and method, which can test the effect of erosion on the performance of hydraulic concrete under the action of long-term constant three-dimensional tensile and compressive stress and high hydraulic gradient

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