Method for Quantitative Determination of Perclase Mass Percentage in Cement by Subtraction Method
A mass percentage, quantitative determination technology, applied in the field of building materials, can solve the problems of large error in the measurement value of electrical conductivity, large deviation of the mass percentage of periclase from the true value, and low reliability of the measurement results. High accuracy, accurate expansion characteristics, avoidance of interference effects
Active Publication Date: 2019-04-02
CHINA BUILDING MATERIALS ACAD
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1-4
[0048] Embodiment 1-4, high magnesium cement quantitative determination important parameter
[0049] Examples 1-4 of the present invention use 4 kinds of low-heat Portland cements with different MgO mass percentages (4.04%, 4.87%, 5.92%, and 7.05%) 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.
[0050] Table 1 Important parameters of quantitative determination of high magnesium cement
[0051]
[0052]
[0053] Compared with the prior art, the present invention has the advantages that: the method for quantitatively determining the mass percentage of periclase in cement of the present invention can avoid the interference of solid-dissolved magnesium oxide in cement, and simultaneously eliminate the presence of magnesium hydroxide in the thermogravi...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for quantitatively measuring mass percentage content of periclase in cement by minusing, comprising the steps of (1) preparing a mixed cement paste under-measurement sample and under-measurement cement paste under-measurement sample; (2) acquiring mass percentage contents of free calcium oxide in the under-measurement samples, and calculating mass percentage contents of Ca(OH)2 in the under-measurement samples; (3) measuring weight-loss percentage of each under-measurement sample by means of thermogravimetric analysis, and calculating mass percentage content of periclase in under-measurement cement. The method allows mass percentage content of periclase in cement to be measured precisely, effectively and quantitatively, expansion features of high-magnesium cement can be evaluated more accurately, and the cement may meet the requirements of different projects upon its expansion.
Description
technical field [0001] The invention relates to the technical field of building materials, in particular to a method for quantitatively determining the mass percentage of periclase in cement by a subtraction method. 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 agg...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 马忠诚王晶文寨军刘云魏丽颖王显斌
Owner CHINA BUILDING MATERIALS ACAD