Method for detecting activity of metakaolin by using spectrophotometer

A spectrophotometer, metakaolin technology, applied in the measurement of color/spectral properties, etc., can solve the problems of inconvenient detection, inconspicuous color change, and difficulty in judging the titration end point, achieving less sample volume, fast analysis speed, and low equipment cost. Effect

Inactive Publication Date: 2010-10-06
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since it needs to be heated and boiled, the indicator can only be added dropwise after cooling, which brings inconvenience to the detection
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  • Method for detecting activity of metakaolin by using spectrophotometer
  • Method for detecting activity of metakaolin by using spectrophotometer
  • Method for detecting activity of metakaolin by using spectrophotometer

Examples

Experimental program
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Example Embodiment

[0041] Example 1

[0042] 1) Using Zhangzhou iron dyed kaolin as raw material. Where Al 2 O 3 The content is 38.24%, Fe 2 O 3 The content is 0.94%. The main mineral composition is kaolinite and a small amount of quartz, and the mineral structure is flake-like and a lot of tubular.

[0043] 2) Put Zhangzhou iron-dyed kaolin in a high-temperature energy-saving electric furnace for calcination. The kaolin is ground and passed through a 100-mesh sieve. The heating rate is 7.5℃ / min, the calcination temperature is 500℃, 600℃, 700℃, 800℃, 900℃, 1000℃, and the calcination time is 2h. After the calcination, the kaolin was cooled to room temperature with the furnace, and a metakaolin sample was obtained.

[0044] 3) Weigh about 1g of metakaolin sample and pour it into a 250mL three-necked flask. Then pour 20mL of 15% hydrochloric acid, heat to 80°C in a constant temperature water bath, and stir to react for 2h. The liquid-solid mixture in the three-necked flask is cooled, filtered, and w...

Example Embodiment

[0049] Example 2

[0050] The raw materials and the analysis and testing process are the same as in Example 1. The kaolin is passed through a 100 mesh sieve. When calcining kaolin, the heating rate is 7.5°C / min, the calcination temperature is 700°C, and the calcination time is 2h, 4h, 6h, 8h, 10h, respectively. The measured activated alumina content is: 17.84%, 18.72%, 19.02%, 19.56%, and 19.86%. The compressive strengths of the prepared geopolymer cementing materials are 55.26MPa, 57.59MPa, 58.02MPa, 58.96MPa, and 59.46MPa, respectively. It has a good corresponding relationship with the measured activated alumina content.

Example Embodiment

[0051] Example 3

[0052] The raw materials and the analysis and testing process are the same as in Example 1. The kaolin is passed through a 100 mesh sieve. When calcining kaolin, the heating rate is 2.5℃ / min, 5℃ / min, 7.5℃ / min, and 10℃ / min. The calcination temperature is 700°C, and the calcination time is 2h. The measured activated alumina contents are: 16.32%, 17.13%, 17.84%, 18.26%. The compressive strengths of the prepared geopolymer cementing materials are 54.78MPa, 54.92MPa, 55.26MPa, 55.56MPa, respectively. It has a good corresponding relationship with the measured activated alumina content.

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Abstract

The invention discloses a method for detecting activity of metakaolin by using a spectrophotometer, and relates to metakaolin. The invention provides the method for detecting the activity of the metakaolin by using the spectrophotometer, with the advantages of simple and convenient operation, quick measurement and reliable result. The method comprises the following steps of: pouring a sample into a container, adding hydrochloric acid into the container, performing heating reaction on the mixture, and adding water into the filtrate to fix the volume; placing an aluminum sheet into the container, infiltrating the aluminum sheet by using the hydrochloric acid till a surface oxidation layer is dissolved, pouring out the hydrochloric acid solution, placing the aluminum sheet into the container, adding aqua regia into the container, heating and dissolving the aluminum sheet, transferring the solution into a volumetric flask, diluting the solution by using water, transferring the solution into the volumetric flask, diluting the solution by using water, injecting 1mu g/mL aluminum standard solution into the volumetric flasks respectively, adding ascorbic acid solution, chromazurine-S ethanol solution and hexamethylenetetramine solution into the volumetric flask, adding water into the volumetric flask to fix the volume, then transferring the mixture to an absorption vessel, measuring the absorbance at the 545nm wavelength of the spectrophotometer, and solving the slope of an aluminum working standard curve; and measuring the aluminum content of the acid extract, and then calculating the active aluminum oxide content of the metakaolin.

Description

technical field [0001] The invention relates to metakaolin, in particular to a method for detecting the activity of metakaolin by using a spectrophotometer. Background technique [0002] Metakaolin is a metastable substance with certain chemical activity obtained after calcining kaolin at an appropriate temperature. The atomic arrangement in metakaolin is irregular, showing a thermodynamic metastable state, and has high pozzolanic activity. Therefore, metakaolin is a highly active artificial pozzolanic material. Due to its unique mineral properties, metakaolin can be used not only as a new type of mineral admixture, but also in the research and application of new cementitious materials. [0003] Metakaolin energy and cement hydration product Ca(OH) 2 The reaction produces calcium aluminate hydrate, C-S-H gel and other gelling substances, which have high hydration activity and can be used as concrete mineral admixtures. It can improve the workability and durability of hard...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 罗学涛傅翠梨李锦堂陈文辉
Owner XIAMEN UNIV
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