Concrete raw material chlorine ion content determination method

A technology for chloride ion content and determination method is applied in the field of chloride ion content determination of concrete raw materials, and can solve the problems of low test efficiency of ion chromatography, manual operation error of potentiometric titration, etc.

Pending Publication Date: 2021-04-20
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for measuring the chloride ion content of concrete raw materials, so as to avoid the danger brought by the toxic chemicals in the indicator titration method, the error caused by the manual operation of the potentiometric titration method, and the test efficiency of the ion chromatography method. Low problems, improve the accuracy of the measurement results and measurement efficiency

Method used

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  • Concrete raw material chlorine ion content determination method

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Effect test

Embodiment 1

[0026] Accurately weigh 3.8991g of the concrete raw material Portland cement, put it in a 500mL beaker, add 50mL of water, stir to disperse the sample completely, add 50mL of 30vt% nitric acid solution under stirring, heat and slightly boil at 100°C for 2min, remove it, and use a pipette Accurately pipette 1.0mL of 5.0mg / mL silver nitrate solution into the liquid tube, stir and boil at 100°C for 2min, add a little filter paper, filter with fast filter paper washed with 2% nitric acid solution in advance, and collect the filtrate in a pre-weighed In a 250mL Erlenmeyer flask with a mass of 116.34g, wash the beaker, glass rod and filter paper until the total volume of the filtrate and washings reaches about 200mL to be tested, and weigh the total mass of the solution and the Erlenmeyer flask (with a mass of 316.87 g). The concentration of the solution to be tested is determined to be 15.392 μg / g by the established method of inductively coupled plasma emission spectrometry, and ca...

Embodiment 2

[0030] Accurately weigh 4.5335g of concrete raw material ore powder, put it in a 500mL beaker, add 50mL of water, stir to completely disperse the sample, add 50mL of 40vt% nitric acid solution under stirring, heat to a slight boil at 100°C for 2min, remove it, and use a pipette Accurately pipette 1.0mL of 5.0mg / mL silver nitrate solution into it, stir and boil at 100°C for 1min, add a little filter paper, filter with fast filter paper washed with 2% nitric acid solution in advance, and collect the filtrate in a pre-weighed In a 250mL Erlenmeyer flask (mass is 115.65g), wash the beaker, glass rod and filter paper until the total volume of the filtrate and washings reaches about 200mL to be tested, and weigh the total mass of the solution and the Erlenmeyer flask (mass is 316.03g ). The concentration of the solution to be tested is determined to be 14.741 μg / g by the established method of inductively coupled plasma emission spectroscopy, and calculated according to the formula, ...

Embodiment 3

[0032] Accurately weigh 4.1129g of concrete raw material fly ash, put it in a 500mL beaker, add 50mL of water, stir to disperse the sample completely, add 50mL of 40vt% nitric acid solution under stirring, heat to a slight boil at 100°C for 1min, remove it, and use a pipette Accurately pipette 1.0mL of 5.0mg / mL silver nitrate solution into the liquid tube, stir and boil at 100°C for 1min, add a little filter pulp paper, filter with fast filter paper washed with 2% nitric acid solution in advance, and collect the filtrate in a pre-weighed In a 250mL Erlenmeyer flask with a mass of 117.33g, wash the beaker, glass rod and filter paper until the total volume of the filtrate and washings reaches about 200mL to be tested, and weigh the total mass of the solution and the Erlenmeyer flask (with a mass of 317.81 g). The concentration of the solution to be tested is determined to be 19.514 μg / g by the established method of inductively coupled plasma emission spectrometry, and calculated...

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Abstract

The invention discloses a concrete raw material chlorine ion content determination method, which comprises the following steps: adding a to-be-determined concrete raw material into a nitric acid solution, and heating for 1-2 minutes; accurately adding excessive silver nitrate solution, stirring and heating to precipitate all chlorine ions in the raw material in the form of silver chloride; filtering to remove silver chloride precipitates and undissolved raw materials to obtain supernatant liquid; preparing silver ion standard solutions with different concentrations, and establishing a standard curve with the concentration as the horizontal coordinate and the electric signal value CPS as the vertical coordinate by using an inductively coupled plasma emission spectrum; and determining the concentration of silver ions in the clear liquid by using an inductively coupled plasma emission spectrum and the standard curve, and obtaining the content of chlorine ions in the concrete raw material through a calculation formula. The method is suitable for concrete cement, mineral admixtures, sand, stone, additives and other raw materials, and the testing method is simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, and in particular relates to a method for measuring the chloride ion content of concrete raw materials. Background technique [0002] Chloride ion content is an important factor affecting the durability of concrete. If the content of chloride ions in concrete is too high, it is easy to cause the electrochemical reaction of the steel bars inside the concrete and cause the steel bars to corrode, which will cause the volume of the concrete to expand, loosen, and destroy the concrete structure. Chloride ions in concrete mainly come from raw materials such as cement, water, sand and admixtures used in mixing, so to control the content of chloride ions in concrete must start with its raw materials. Selecting the appropriate test method for chloride ion content is an extremely important part of the entire quality control process. [0003] At present, there are different test methods for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N21/73
Inventor 郭睿王军赵日煦高飞吴媛媛王婵王淑
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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