A device and method for evaluating the durability of concrete under the action of wick effect

Abstract

A device and method for evaluating the durability of concrete under the action of a wick effect. The device includes a frame, a workbench mounted on the frame, and a plurality of independent specimen clamping devices fixed on the workbench. The specimen clamps The device includes a solution box and a vacuum box arranged side by side at both ends of the test piece, and a fixture for clamping the test piece between the solution box and the vacuum box. The opening of the projected size of the end surface of the piece, the inside of the solution box and the vacuum box communicate with the test piece through the opening, and the solution box and the vacuum box are provided with a seal that makes the contact surface of the test piece and the opening sealed. The top of the tank is provided with a liquid injection port connected with the solution tank, and a vertically arranged scale tube with a sealing plug can be placed at the liquid injection port. The vacuum box is provided with a vacuum port connected with a vacuum pump. The invention has simple and reasonable structure, simple operation steps, convenient installation and debugging, and is suitable for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of water or salt permeability erosion resistance in the research of concrete durability, and in particular relates to a device and method for evaluating the durability of concrete under the action of a wick effect. Background technique [0002] When concrete is located in soil or groundwater with dissolved sulfate or chloride salts, it will be damaged by salt erosion, and the degree of damage to concrete depends on the content of salt that has penetrated into the concrete. Existing studies have shown that the degree of half-immersion damage in concrete salt erosion damage is much greater than that of full immersion damage. In fact, under the condition of half-immersion, salt also enters the interior of the concrete in the form of the wick effect. The groundwater in western my country is rich in a large amount of sulfate and chloride salts, and the lining concrete of the railway tunnel in it will be corroded,...

AI Technical Summary

Problems solved by technology

[0003] The current concrete durability codes usually use the "gradual pressurization method" or "water seepage height method" to evaluate the impermeability of concrete. First, in the "gradual pressurization method" or "water seepage height method", the maximum pressure of the specimen Near 1.0MPa, it is far greater than the maximum negative pressure value in the actual working environment of tunnel lining concrete and concrete in a semi-immersed state, which is quite different from the actual engineering environment; secondly, with the development of high-performance concrete, high-performance concrete The impermeability of the impermeability is generally relatively low, and the traditional test method specimen size thickness is 150mm, resulting in a long test cycle, and even impermeability

The current test method of concrete impermeability performance can not really reflect the characteristics of concrete anti-water or salt solution penetration erosion under the action of wick effect. And devices to evaluate the performance of concrete against water or salt solution erosion

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