GB/T 205-2024 in English

《GB/T 205-2024铝酸盐水泥化学分析方法》由TC184（全国水泥标准化技术委员会）归口，主管部门为中国建筑材料联合会。

Methods for chemical analysis of aluminate cement

1 Scope

This document specifies the basic requirements, reagents and materials, instruments and apparatus, specimen preparation, reference method and alternative method for chemical analysis of aluminate cement.

This document is applicable to the chemical analysis of aluminate cement, sulphoaluminate cement and aluminum calibration materials used in cement production.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.

GB/T 176 Methods for chemical analysis of cement
GB/T 5762 Methods for chemical analysis of limestone, quicklime and hydrated lime for building materials industry
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 12573 Sampling method of cement

3 Terms and definitions

No terms and definitions are listed in this document.

4 General requirements for test

4.1 Number of tests and requirements

The number of tests for determination of each item shall be two. The absolute difference between two results shall be within the tolerance in the same laboratory (see Table 2). The mean of the two test results shall be used to express the determination result.

Unless otherwise stated, it is recommended that the determination of loss on ignition shall be carried out in parallel in chemical analysis; for other determinations, blank test shall be carried out in parallel, and the determination results shall be corrected.

4.2 Expression of masses, volumes, volume ratios, titers and results

Express masses in “grams (g)” to the nearest of 0.0001g and volumes from burettes in “milliliters (mL)” to the nearest of 0.01mL. Express the titers of solutions in “milligrams per milliliter (mg/mL)”. The results of titer and volume ratio are rounded off to four significant figures.

Unless otherwise stated, all analysis results shall be based on mass fraction. The analysis result of chloride ion shall be rounded off to three decimal places, and the analysis result of other items shall be rounded off to two decimal places.

The rounding off of numerical value shall comply with GB/T 8170.

4.3 Blank test

Unless otherwise stated, conduct the test following the same determination steps without adding the specimen but using an equal amount of reagent. Correct the obtained determination results accordingly.

Contents
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements for test
5 Reagents and materials
6 Instruments and apparatus
7 Specimen preparation
8 Determination of loss on ignition - ignition subtraction method
9 Determination of silicon dioxide - silicomolybdic blue spectrophotometric method (reference method)
10 Determination of ferric oxide - o-Phenanthroline spectrophotometric method (reference method)
11 Determination of titanium dioxide - diantipyrylmethane spectrophotometric method (reference method)
12 Determination of aluminum oxide - zinc sulfate back titration method (reference method)
13 Determination of calcium oxide - EDTA titration method (reference method)
14 Determination of magnesium oxide - EDTA titration subtraction method (alternative method)
15 Determination of magnesium oxide - atomic absorption spectrophotometric method (reference method)
16 Determination of insoluble matters - hydrochloric acid method
17 Determination of total sulfur in aluminate cement——Eschka method (reference method)
18 Determination of potassium oxide and sodium oxide - flame spectrophotometric method (reference method)
19 Determination of fluorine ion - ion selective electrode method
20 Determination of silicon dioxide - potassium fluosilicate volumetric method (alternative method)
21 Determination of ferric oxide - bismuth nitrate back titration method (alternative method)
22 Determination of titanium dioxide - bismuth nitrate back titration method (alternative method)
23 Determination of aluminum oxide - zinc sulfate back titration method (alternative method)
24 Determination of chloride ion - automatic potentiometric titration method (reference method)
25 Determination of sulfate and sulfur trioxide in sulphoaluminate cement - barium sulfate gravimatric method (reference method)
26 Determination of total sulfur in aluminate cement - coulometric titration method (alternative method)
27 X-ray fluorescence analysis method (alternative method)
28 Determination of ferric oxide, magnesium oxide, titanium dioxide, potassium oxide, sodium oxide and manganous oxide by inductively coupled plasma atomic emission spectrometry (alternative method)
29 Tolerances
Bibliography