GB/T 27975-2011Methods for the chemical analysis of granulated blastfurnace slag (English PDF)

粒化高炉矿渣的化学分析方法

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC

Level / Type

National · Recommended

Issue date

December 30, 2011

Implementation date

October 1, 2012

Scope

GB/T 27975-2011 is the English-translated version of 粒化高炉矿渣的化学分析方法.

China's national methods for the chemical analysis of granulated blastfurnace slag. It specifies the determination of silica, iron oxide, aluminium oxide, calcium oxide, magnesium oxide, manganese dioxide, titanium dioxide, fluoride, total sulphur, loss on ignition, chloride, water-soluble hexavalent chromium, alkali content, sulphur trioxide and moisture, and it applies to granulated blastfurnace slag and to other materials to which the methods are applicable. Blastfurnace slag is the molten waste that floats on the iron in an ironmaking furnace, and what happens to it in the next few seconds decides whether it is a road aggregate or a cementitious material worth several times as much. Cooled slowly it crystallises and is inert. Quenched in water it granulates into a glass, and that glass, ground to cement fineness, hydrates when activated by the alkali and the calcium hydroxide released by Portland cement. Ground granulated blastfurnace slag replaces up to seventy per cent of the clinker in some concretes, and it makes a concrete with lower heat of hydration, lower permeability and much better resistance to sulphate and to chloride ingress. The analysis this standard specifies is what qualifies a slag for that use. The major oxides determine the hydraulic activity through the ratios the product standards impose; the sulphur has to be measured in two forms because slag contains sulphide as well as sulphate, and only the sulphate counts against the concrete's limit; the loss on ignition can be negative, since sulphide oxidises on ignition and the sample gains mass; and the water-soluble hexavalent chromium is determined because it is the cause of cement eczema in construction workers. Issued on 30 December 2011 and in force since 1 October 2012.

Document preview — GB/T 27975-2011

National Standard of the People's Republic of China

ICS: 91.100.10
Classification: Q 11

Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC

ForewordIII
1 Scope1
2 Normative references1
Basic requirements 3 Test1
4 Reagents and materials2
Instruments and equipment 45
Sample Preparation 66
7 Determination of moisture content of6
8 Determination of loss on ignition - ignition subtraction6
9 Determination of potassium oxide and sodium oxide --- a flame photometric method (Reference method)7
10 Determination of potassium oxide and sodium oxide --- Atomic Absorption Spectrometry (generation of usage)8
Determination of total sulfur 911

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules.

The standard proposed by China Building Materials Federation.

This standard by the National Standardization Technical Committee cement (SAC/TC184) centralized.

This standard was drafted. China Building Materials Science Research Institute, China Building Material Test Certification Center Co., Ltd., Jiaxing Southern Water Limited mud.

The main drafters of this standard. Cui Jian, Liu Long, Wang Ruihai, Huang Qinglin, Nizhu Jun, wearing flat, in grams of filial piety, yellow small building, Wen Yugang.

Chemical analysis of the granulated blast furnace slag

1 Scope

This standard specifies the granulated blast furnace slag in silica, iron oxide, aluminum oxide, calcium oxide, magnesium oxide, manganese dioxide

Titanium, fluoride, total sulfur, loss on ignition, chloride, water-soluble hexavalent chromium, alkali content, sulfur trioxide, a chemical analysis of water content.

This standard applies to granulated blast furnace slag and chemical analysis specified in this standard to other materials.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein

Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 176 chemical analysis of cement

GB/T 2007.1 bulk minerals sampling and sample preparation General manual sampling methods Laboratory use specifications and test methods GB/T 6682 Analysis

GB/T 17671 cement mortar strength test method (ISO method) (GB/T 17671-1999, IDTISO 679. 1989) JC/T 681 planetary cement mortar mixer Basic requirements 3 trials 3.1 the number of trials Each number is measured twice, indicating that the measurement result by the average of the two test results. During chemical analysis, unless otherwise indicated, shall be measured at the same time the loss on ignition; the other blank test should be measured at the same time, And to correct the measurement results. It represents 3.2 mass, volume, titer and results Grams (g) represents the mass, accurate to 0.0001g. Burette volume in milliliters (mL) said accurate to 0.05mL. Single titer Indicates milligrams per milliliter (mg/mL). Unless otherwise indicated, the results of the analysis are mass fraction. The results expressed in% to two after the decimal point. Using the same quantities of reagents, no test, tested in accordance with the same measurement step, the measurement result is corrected.

3.4 Burning

The filter paper and the precipitate is fired and the constant has been previously placed in a crucible, in order to avoid generating a flame dried slowly in an oxidizing atmosphere, ashing,

Ashing to no black carbon particles, into the high-temperature furnace (5.6), and at a predetermined temperature burning. Cool to room temperature in a desiccator, and weigh.

After the first burning, cooling, weighing, by continuous burning for every 15min, then cooled, weighing method to check the constant quality

Amount, when the difference is less than two consecutive weighing 0.0005g, which reached constant.

Remaining clauses in the full document

4 Reagents and materials
7 Determination of moisture content of
8 Determination of loss on ignition - ignition subtraction
9 Determination of potassium oxide and sodium oxide --- a flame photometric method (Reference method)
10 Determination of potassium oxide and sodium oxide --- Atomic Absorption Spectrometry (generation of usage)

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 14 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 2007.1 · GB/T 17671-1999

Similar standards

GB/T 27974-2011|GB/T 176-2017|GB/T 203-2008|GB/T 18046-2017|GB/T 17671-2021|GB/T 2007.1-1987

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