Method for measuring chloride ion permeability resistance of concrete

A technology of chloride ion penetration and measurement method, which is applied in the field of concrete chloride ion permeability measurement, which can solve the problems of temperature rise, inaccurate and reliable detection results, and many defects, so as to achieve high detection accuracy and solve the problem of inaccurate detection results Reliable, Believable Results

Inactive Publication Date: 2018-10-19
WEST ANHUI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing chloride ion permeability test methods generally use the electric flux method, although the electric flux method is simple and fast, but there are many defects
First of all, the accuracy of the test results is poor, especially for concrete with poor resistance to chloride diffusion. Due to the high voltage applied, the temperature of the solution and the specimen will both rise, and the concrete will be deteriorated, resulting in distortion of the test results.
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Method used

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  • Method for measuring chloride ion permeability resistance of concrete
  • Method for measuring chloride ion permeability resistance of concrete
  • Method for measuring chloride ion permeability resistance of concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0014] First, soak the specimen in the standard curing water pool for 4 days, then put the specimen into the rubber cylinder, and inject about 300mL of 0.2mol / L KOH solution into the rubber cylinder, so that both the anode plate and the surface of the specimen are immersed in the solution. Inject 0.2mol / L KOH solution containing 5% NaCl into the test tank until it is flush with the liquid level of the KOH solution in the rubber cylinder, turn on the power, record the time and immediately measure the parallel voltage, series current and initial temperature of the electrolyte (accurate to 0.2°C), take out the test piece after electrification, split it in half, use 0.1mol / L silver nitrate to titrate the diffusion depth of chloride ions, and finally calculate the chloride ion diffusion coefficient of concrete according to the formula, where the formula is

Embodiment 2

[0016] In Embodiment 1, add the following content:

[0017] The standard size of the test piece is (100±1)mm in diameter and (50±2)mm in height. The test piece is cored from the laboratory or the actual concrete structure and cut into standard sizes.

[0018] First soak the test piece in the standard curing water pool for 4 days, and then put the test piece into the rubber tube. The standard size of the test piece is (100±1) mm in diameter and (50±2) mm in height. Take the core from the concrete structure and cut it into a standard size. Inject about 300mL of 0.2mol / L KOH solution into the rubber cylinder, so that the anode plate and the surface of the test piece are immersed in the solution, and inject 5% NaCl into the test tank. 0.2mol / L KOH solution until it is flush with the liquid level of the KOH solution in the rubber cylinder, turn on the power, record the time and immediately measure the parallel voltage, series current and initial temperature of the electrolyte (accu...

Embodiment 3

[0021] In embodiment two, add the following content:

[0022] D. RCM，0 Indicates the chloride ion diffusion coefficient of concrete determined by the RCM method, in m 2 / s; T is the average value of the initial and final temperature of the anolyte in K.

[0023] First soak the test piece in the standard curing water pool for 4 days, and then put the test piece into the rubber tube. The standard size of the test piece is (100±1) mm in diameter and (50±2) mm in height. Take the core from the concrete structure and cut it into a standard size. Inject about 300mL of 0.2mol / L KOH solution into the rubber cylinder, so that the anode plate and the surface of the test piece are immersed in the solution, and inject 5% NaCl into the test tank. 0.2mol / L KOH solution until it is flush with the liquid level of the KOH solution in the rubber cylinder, turn on the power, record the time and immediately measure the parallel voltage, series current and initial temperature of the electrolyte ...

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Abstract

The invention discloses a method for measuring chloride ion permeability resistance of concrete. The method comprises the following steps: firstly, soaking a test piece in a standard curing water tankfor 4 days, then putting the test piece into a rubber barrel, injecting about 300mL of a KOH solution with the concentration of 0.2mol/L into the rubber barrel so as to immerse an anode plate and thesurface of the test piece in the solution, injecting a KOH solution having the concentration of 0.2mol/L and containing NaCl with the concentration of 5%, into a test tank until the liquid level is flush with that of the KOH solution in the rubber barrel, turning on power, recording time, immediately and simultaneously measuring the parallel voltage, the serial current, and the initial temperature of an electrolyte (accurate to 0.2 DEG C), taking out the test piece after power off, splitting the test piece into two halves, titrating the diffusion depth of chloride ions by utilizing silver nitrate with the concentration of 0.1mol/L, and finally calculating a chloride ion diffusion coefficient of the concrete according to a formula. With the method, the actual transfer process of the chloride ions can be reflected, measurement can also be carried out in a constant-temperature environment and is not affected by the conductivity of the concrete, and the problem that a detection result byan electric flux method is inaccurate and unreliable is solved.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a method for measuring the chloride ion permeability resistance of concrete. Background technique [0002] my country has a vast sea area, and large-scale infrastructure construction is mostly concentrated in coastal areas. Due to the severe chloride ion corrosion of coastal buildings, the corrosion of steel bars is very serious, which is one of the main reasons for durability failure. In recent years, the industry has made a lot of progress in the research on the mechanism of chloride ion erosion damage, model prediction, test detection, preventive repair, etc. The chloride ion permeability test method is used as the detection and evaluation method and objective basis for the main indicator of durability, so it is particularly important to determine an objective, accurate and practical test method. The chloride ion permeability resistance of concrete is one of the important i...

Claims

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Application Information

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IPC IPC(8): G01N13/04
CPCG01N13/04G01N2013/003
Inventor 葛清蕴杨富莲秦凤艳卞祝
Owner WEST ANHUI UNIV
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