Improved method for determining free chlorine ions in cement paste or mortar

A technology of cement slurry and chloride ions, applied in the direction of material electrochemical variables, etc., can solve the problems of complicated experimental steps and harsh experimental conditions

Inactive Publication Date: 2014-07-16
BEIJING UNIV OF TECH
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This method has strict requirements on the experimental conditi

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  • Improved method for determining free chlorine ions in cement paste or mortar
  • Improved method for determining free chlorine ions in cement paste or mortar
  • Improved method for determining free chlorine ions in cement paste or mortar

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[0021] The present invention will be further described below in conjunction with the examples, but the present invention is not limited to the following examples.

[0022] The main reagents and instruments needed are: nitric acid (50wt%), silver nitrate (analytical pure), sodium chloride (analytical pure), Erlenmeyer flask (250ml), standard sieve (aperture 0.63mm), potentiometer, silver electrode (or Chlorine electrode), calomel electrode, electromagnetic stirrer, brown burette (50ml), pipette (20ml), balance (division value 0.0001g).

[0023] (1) Preparation of sodium chloride standard solution (0.1000mol / L): weigh about 10g of sodium chloride, put it in a weighing bottle, dry it at 130°C-150°C for 2 hours, and weigh it accurately after cooling in a desiccator 5.8443g, dissolved in water and diluted to 1L, stored in a volumetric flask for later use;

[0024] (2) Preparation of silver nitrate solution (17g / L): Weigh about 17g of silver nitrate, dissolve it in water, put it in...

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Abstract

The invention provides an improved method for determining free chlorine ions in cement paste or mortar and belongs to the technical field of determination of building materials. The improved method comprises the following steps: preparing a sodium chloride standard solution and a silver nitrate solution with the concentration of c; grinding the mortar in concrete until all the mortar passes through a square hole sieve with the hole diameter of 0.63mm; drying the mortar at 105+/-5 DEG C for 2 hours and recording the weight as G; adding de-ionized water; shaking and immersing; filtering and adding nitric acid into a filtering solution; inserting electrodes; connecting the two electrodes with a potentiometer; titrating by using the silver nitrate solution; recording potentials and readings of a corresponding burette; recording the volume V of silver nitrate corresponding to a titrating final point; calculating the content of the free chlorine ions in a cement slurry system according to a formula as shown in the specification; if the difference of titrating results of two times is less than 1%, finally obtaining an average value; if the difference of the titrating results of the two times is more than 1%, continuing to titrate until the difference of the titrating results of the two times is less than 1%. According to the method, the titrating final point is obvious and the accuracy is high; an experiment process is simple and convenient and is suitable for large-batch tests.

Description

technical field [0001] The invention belongs to the technical field of measuring building materials, and relates to an improved method for measuring free chloride ions in cement paste or mortar. Background technique [0002] Chloride ion problem is a well-known problem in the building materials industry, and it has attracted widespread attention due to its corrosion of steel bars and resulting structural damage. Therefore, how to suppress the harm of chloride ions in the cement slurry system has always been valued by the industry. With the increasing reduction of high-quality natural resources and the use of solid waste and its disposal derivatives, the problem of chloride ions in the cement slurry system has new connotations, such as the use of sea sand, disposal of alkali slag and waste incineration ash, etc. Comprehensive utilization in cement slurry system. Therefore, it is very important to accurately judge the ability of cement-based materials to cure chloride ions. ...

Claims

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Application Information

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IPC IPC(8): G01N27/42
Inventor 严建华张程浩崔素萍郝挺宇庞保雪周朋张东梅柏晓强
Owner BEIJING UNIV OF TECH
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