Determination method of mass percentage of periclase in cement
A technology of mass percentage content and determination method, which is applied in the field of building materials, can solve problems such as the large deviation of the mass percentage content of periclase from the true value, low reliability of measurement results, and large errors in conductivity measurement values. Accurate expansion characteristics, high precision, avoid interference effect
Active Publication Date: 2019-04-02
CHINA BUILDING MATERIALS ACAD
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Problems solved by technology
The conductivity method is easily affected by factors such as temperature, concentration, voltage, current, distance between two electrodes, and electrode insertion depth. There are also factors such as the systematic error of the X-ray diffractometer, the drawing of the standard curve, and the selection of pure phases, which also cause the measured mass percentage of periclase to deviate from the true value, and the reliability of the measurement results is low.
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Embodiment 1-4
[0038] Embodiment 1-4, high magnesium cement quantitative determination important parameter
[0039] Examples 1-4 of the present invention use 4 kinds of low-heat Portland cements with different MgO mass percentages (4.27%, 4.92%, 5.71%, and 7.23%) produced by Jiahua Special Cement Co., Ltd. to carry out the cement recipe respectively. Quantitative determination of magnesite. The important parameters of quantitative determination of high magnesium cement in Examples 1-4 of the present invention are shown in Table 1.
[0040] Table 1 Important parameters of quantitative determination of high magnesium cement
[0041]
[0042]
[0043] Compared with the prior art, the present invention has the advantages that: the determination method of periclase mass percentage content in cement of the present invention can avoid the interference of solid solution magnesium oxide in cement, has high accuracy, and is convenient for evaluating the quality of cement more accurately. Expan...
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The invention discloses a determination method for mass percentage of periclase in cement. The method comprises the following steps of: (1) preparing a mixed cement neat paste to-be-tested sample and a to-be-tested cement neat paste to-be-tested sample; and (2) separately determining the weight loss percentage of the mixed cement neat paste to-be-tested sample and the to-be-tested cement neat paste to-be-tested sample in a range of 300-390 DEG C by means of thermogravimetric analysis, and calculating the mass percentage of periclase in cement. The method disclosed by the invention can effectively avoid interference of magnesium oxide in a solid solution in cement, and can precisely and effectively quantify the mass percentage of periclase in cement.
Description
technical field [0001] The invention relates to the technical field of building materials, in particular to a method for determining the mass percentage of periclase in cement. Background technique [0002] The study found that the hydration of periclase calcined at high temperature is very slow, and the volume expansion caused by the formation of magnesium hydroxide occurs later. According to the characteristics of mass concrete, the majority of scientific and technological personnel have proposed the use of MgO concrete technology after more than 30 years of research, using the delayed micro-expansion characteristics of MgO concrete itself, so that the volume of concrete will expand during the temperature drop process, compensate for temperature drop shrinkage, and improve the performance of concrete. Crack resistance, in order to achieve all or most of the traditional temperature control measures such as mass concrete pre-cooling aggregate, ice mixing, pre-embedded coolin...
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IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 姚燕马忠诚文寨军刘云王显斌魏丽颖
Owner CHINA BUILDING MATERIALS ACAD