Test method for quickly evaluating corrosion of reinforcement bars in chloride ion environment

A test method and corrosion test technology, applied in the direction of weather resistance/light resistance/corrosion resistance, weighing and measuring devices by removing certain components, can solve problems that cannot be well applied to actual needs, and achieve acceleration and reproducible effects

Inactive Publication Date: 2013-12-11
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above-mentioned test methods are all mechanistic studies and cannot be well applied to actual needs.

Method used

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  • Test method for quickly evaluating corrosion of reinforcement bars in chloride ion environment
  • Test method for quickly evaluating corrosion of reinforcement bars in chloride ion environment
  • Test method for quickly evaluating corrosion of reinforcement bars in chloride ion environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The test materials are the 5 kinds of steel bars in the above test examples (ie, 0#~4# steel bar samples), which are processed according to the sample size diagram. Perform pretreatment according to the method described in the above test example, and prepare test samples. Sodium chloride solutions with test solution concentrations of 0.01%, 0.10%, 0.30%, 0.50%, 0.60%, 0.75%, 1.25%, 1.50%, 20%, 2.50%, and 3.50% were prepared respectively, and the pH value was 7.0. Set the temperature of the bath solution in the peripheral immersion testing machine to 45°C±2°C, keep the humidity in the box at 70%RH±10%RH, and conduct cycle experiments in the order of "immersion→wetting→drying", the cycle period is 60min ±5min, of which, the infiltration time is 12min±2min, and the test period is 72h.

[0057] image 3 It is a graph showing the average corrosion rate of 0# to 4# steel bars in different mass fractions of sodium chloride solution environment according to Example 1. Depend...

Embodiment 2

[0059] The test material is the above-mentioned 0# steel bar, processed according to the sample size drawing, and pre-treated according to the method described in the test example. Prepare test samples, and prepare sodium chloride solutions with initial pH values ​​of 7.0, 10.2, 11.2, 11.37, 11.68, 11.80, 11.94, 12.04, and 12.46, with a mass fraction of 2.00%. Control the temperature of the bath solution in the weekly immersion testing machine at 45°C±2°C, keep the humidity in the box at 70%RH±10%RH, and conduct the cycle test in the order of "dipping→wetting→drying", the cycle period is 60min±5min, Among them, the infiltration time is 12min±2min, and the test period is 72h. The effect of steel corrosion on solution pH was regularly monitored for the initial pH values ​​of 11.94 and 12.46, respectively.

[0060] Figure 4 It shows the average corrosion rate of the 0# comparison steel bar of embodiment 2 in the sodium chloride solution environment of different pH values. Dep...

Embodiment 3

[0063]The test materials are the 5 kinds of steel bars in the above test example (ie, 0#~4# steel bar samples). According to the test result of embodiment 1 and embodiment 2, find suitable, stable accelerated test condition: sodium chloride solution mass fraction is 2.00%, and initial solution pH value is 6.5~7.5, and the solution temperature in the immersion testing machine is 45 ℃±2℃, the humidity in the box is 70%RH±10%RH, the cycle period is 60min±5min, in which the soaking time is 12min±2min, and the test period is 72h. Carry out repeated test to embodiment 1, and test result analysis, analysis acceleration and reproducibility.

[0064] The test results are shown in Tables 2 and 3 below and Image 6 with Figure 7 , where Table 2 and Image 6 The average corrosion rate of the five steel bars in Example 3 in a sodium chloride solution environment with a mass fraction of 2.00% is shown. Table 3 and Figure 7 The average corrosion depth of the five steel bars in Example...

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Abstract

The invention provides a test method for quickly evaluating corrosion of reinforcement bars in a chloride ion environment. The test method is suitable for evaluating the corrosion resistance of corrosion-resistant reinforcement bars and comprises the following steps: adding a sodium chloride solution prepared at room temperature into a box body of a submerged corrosion testing machine to serve as a sample solution, hanging a pre-processed reinforcement bar sample onto a sample rack of the submerged corrosion testing machine through an insulating material; through controlling the humidity in the box body of the submerged corrosion testing machine, the temperature of the sample solution and the circulation period, carrying out repeated circular experiments on the sample according to the sequence of impregnating, wetting and drying so as to enable the reinforcement bars to be corroded; derusting the corroded reinforcement bar sample, and then performing corrosion weight loss analysis to obtain the corrosion resistance of the reinforcement bar sample to chloride ions. According to the invention, quick detection and evaluation of the corrosion resistance of bare reinforcement bars to chloride ions are realized, and the test method has imitativeness, acceleration performance and reproducibility.

Description

technical field [0001] The invention relates to a method for corroding steel bars in a natural environment, in particular to a test method for quickly evaluating the corrosion of steel bars in a chloride ion environment. Background technique [0002] Reinforced concrete is the skeleton of modern buildings. Steel bars are in a highly alkaline environment in concrete. Concrete has both chemical and physical protection for steel bars. This strong alkaline environment can maintain the passivation of steel bars for a long time. However, steel bars will be corroded in practical applications. The intrusion of chlorides in concrete is one of the main causes of steel bar corrosion. Chloride ions can destroy the passivation film on the surface of steel bars and cause localized corrosion of steel bars, which can catalyze the corrosion process. effect. Especially in coastal buildings, cross-sea bridges and highways using deicing and snow salt, chloride ions inevitably penetrate into th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N5/04
Inventor 陈小平王向东米丰毅黄涛杨忠民陈颖王慧敏
Owner CENT IRON & STEEL RES INST
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