Method for measuring chloride ion content in high-performance concrete

A technology for high-performance concrete and chloride ion content, applied in the preparation of test samples, chemical analysis by titration, chemical analysis by precipitation, etc., can solve problems such as difficult accurate determination of chloride ion content, and achieve easy operation , The effect of improving the measurement accuracy

Active Publication Date: 2009-12-30
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for measuring the content of chloride ions in high-performance concrete, which is mainly aimed at the problems that it is difficult to extract chloride ions in high-performance concrete and the content of chlorid

Method used

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  • Method for measuring chloride ion content in high-performance concrete
  • Method for measuring chloride ion content in high-performance concrete
  • Method for measuring chloride ion content in high-performance concrete

Examples

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Embodiment 1

[0034] Present embodiment is the concrete example of the method for measuring chloride ion content in high-performance concrete, comprises the following steps:

[0035] 1. Extract free chloride ions and total chloride ions

[0036] Take 12g of mortar from the high-performance concrete containing chloride ions, and then grind it until it passes through a 0.315mm sieve, dry the powder in a drying oven at 105°C to constant weight, and then put it in a desiccator to cool to room temperature. Weigh 5.000g of powder sample, pour it into a wide-mouth conical flask filled with 100ml of distilled water, plug the bottle mouth with a rubber stopper, shake it with an oscillator for 24 hours, and then shake the liquid in the conical flask after 24 hours of shaking Suction filtration to obtain free chloride ion filtrate. In addition, 5.000g of powder samples were weighed and poured into a wide-mouthed conical flask filled with 100ml of nitric acid solution with a concentration of 15v / v%. ...

Embodiment 2

[0045] Present embodiment is another specific example of the method for measuring chloride ion content in high-performance concrete, comprising the following steps:

[0046] 1. Extract free chloride ions and total chloride ions

[0047] Take 72g of mortar from the high-performance concrete containing chloride ions, and then grind it until it passes through a 0.315mm sieve. The powder is dried in a drying oven at 105°C to constant weight, and then cooled to room temperature in a desiccator. Weigh 30.000g of powder sample, pour it into a wide-mouth conical flask filled with 100ml of distilled water, plug the bottle mouth with a rubber stopper, shake it with an oscillator for 24 hours, and then shake the liquid in the conical flask after 24 hours of shaking Suction filtration to obtain free chloride ion filtrate. In addition, weigh 30.000g powder sample, pour it into a wide-mouth conical flask with 100ml concentration of 15v / v% nitric acid solution, plug the bottle mouth with a ...

Embodiment 3

[0056] Present embodiment is another specific example of the method for measuring chloride ion content in high-performance concrete, comprising the following steps:

[0057] 1. Extract free chloride ions and total chloride ions

[0058] Take 150g of mortar from the high-performance concrete containing chloride ions, and then grind it until it passes through a 0.315mm sieve, dry the powder in a drying oven at 105°C to constant weight, and then put it in a desiccator to cool to room temperature. Weigh 60.000g of powder sample, pour it into a wide-mouth conical flask filled with 100ml of distilled water, plug the bottle mouth with a rubber stopper, shake it with an oscillator for 24 hours, and then shake the liquid in the conical flask after 24 hours of shaking Suction filtration to obtain free chloride ion filtrate. In addition, weigh 60.000g of powder sample, pour it into a wide-mouth conical flask with 100ml concentration of 15v / v% nitric acid solution, plug the mouth of the ...

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Abstract

The invention relates to a method for measuring chloride ion content in high-performance concrete, comprising the steps: (1) free chloride ions and total chloride ions in the high-performance concrete can be extracted by a normal temperature soaking and oscillating method; (2) an improved Volhard chemical titration method is utilized to respectively measure the chloride ion content in the filtrate of the free chloride ions and the total chloride ions obtained in the step (1). The method has the advantages of simple operation, complete extraction, stable result and convenient operation, so as to meet the content measuring requirements of the solution with low concentration chloride ion, and be widely applied to the durability analysis and service life study of the high-performance concrete structure in the chloride environments such as oceans, deicing salt, etc.

Description

1. Technical field [0001] The invention relates to a method for measuring the content of chloride ions in high-performance concrete, in particular to a method for extracting total chloride ions and free chloride ions from high-performance concrete and measuring the content of total chloride ions and free chloride ions by chemical titration method. The total chloride ions are also called acid-soluble chloride ions, and the free chloride ions are also called water-soluble chloride ions. 2. Background technology [0002] Chloride ions are rich in environments such as oceans and deicing salts. Concrete structures are often damaged due to the erosion of chloride ions, which greatly affects the service life of building structures. Concrete mixed with fly ash, slag, silica fume and other mineral admixtures is widely used in marine concrete structures because of its good resistance to chloride ion erosion and diffusion. How to effectively and accurately measure the chloride ion co...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N31/02G01N1/38
Inventor 杨绿峰陈正冯庆革王燚曾建聪高钦
Owner GUANGXI UNIV
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