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GB/T 8074-2008 English PDF (GBT8074-2008)

GB/T 8074-2008 English PDF (GBT8074-2008)

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GB/T 8074-2008: Testing method for specific surface of cement -- Blaine method

This Standard specifies the method of determination for cement fineness with Blaine air permeability apparatus.
GB/T 8074-2008
GB
NATIONAL STANDARD OF
THE PEOPLE REPUBLIC OF CHINA
ICS 91.100.10
Q 11
Replacing GB/T 8074-1987
Testing method for specific surface of cement
- Blaine method
ISSUED ON. JANUARY 9, 2008
IMPLEMENTED ON. AUGUST 1, 2008
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Principle... 5
4 Terms and definitions ... 6
5 Testing equipment and conditions ... 6
6 Instrument calibration ... 7
7 Operating procedures ... 8
8 Calculation ... 9
Annex A (Informative) Cement layer area ratio value ... 12
Annex B (Informative) Mercury density, air viscosity ?? and ??? at different temperatures ... 13
Foreword
This Standard is revised by reference to ASTM C204 "Standard Test Methods for Fineness of Hydraulic Cement by Air-permeability Apparatus", JIS R5201 "Physical Testing Methods for Cement", and EN 196-6 "Methods of Testing Cement - Determination of Fineness".
This Standard replaces GB/T 8074-1987 "Method of Determination for
Specific Surface of Cement - Blaine Method".
Compared with GB/T 8074-1987, the main changes in this Standard are as
follows.
- added GB/T 208 "Standard Test Method for Cement Density" in
Normative References (Chapter 2 in this edition);
- added GB/T 1914 "Chemical Analytical Filter Paper" in Normative
References (Chapter 2 in this edition);
- added GB 12573 "Test Method for Sampling of Cement" in Normative
References (Chapter 2 in this edition);
- added automatic specific surface area analyzer on the basis of original Blaine Method specific surface area analyzer (Article 5.1 in this edition); - specified the area ratio of PI and PII cement 0.500, and the one of other cements 0.530 (Article 5.2 in Edition 1987, Article 7.3 in this edition); - specified that a 2000g balance weight is used to press the temp when
changing the area ratio (Article 7.3 in this edition);
- deleted Table 3 in Appendix A in the previous edition.
Appendix A and Appendix B in this Standard are informative.
This Standard was proposed by the China Building Materials Federation.
This Standard is under the jurisdiction of the National Technical Committee on Cements of Standardization Administration of China (SAC/TC 184).
Main drafting organization of this Standard. China Building Materials
Academy
The drafting organizations of this Standard. Wuxi Jianyi Instrument and
Machinery Co., Ltd., Shaoxing Kente Mechanical and Electrical Co., Ltd., Hebei Kexi Instrument and Equipment Co., Ltd.
The coordinating organizations of this Standard. Lafarge (Beijing) Cement Co., Ltd., Shandong Huayin Special Cement Co., Ltd., Physicochemical
Testing institute of China Cement Development Center, Benxi Cement Plant, Xidong Cement Limited Company, Fushun Cement Limited Company,
Building Material Quality Detection Center of the Zhejiang Building Material Technology Co., Ltd., Huizhou Building Materials Quality Supervision Testing Station, National Building Engineering Quality Supervision and Testing
Center
Main drafters of this Standard. Chen Ping, Yan Bilan, Song Lichun, Zhang Xuecui, Li Diaohai, Wang Wenru.
The standard replaced by this Standard is.
- GB/T 8074-1987.
Testing method for specific surface of cement
- Blaine method
1 Scope
This Standard specifies the method of determination for cement fineness with Blaine air permeability apparatus.
This Standard is applicable to the determination of specific surface area of cements and other powdery materials that this Standard applies whose
specific surface is 2000 cm2/g~ 6000 cm2/g, and it is not applicable to the determination for cellular or micro-powdery material.
2 Normative references
The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. At the time of publication, the editions indicated are valid. All standards are subject to revision. The parties who are using this Standard shall explore the possibility of using the latest version of the following standards.
GB/T 208, Standard Test Method for Cement Density
GB/T 1914, Chemical Analytical Filter Paper
GB 12573, Test Method for Sampling of Cement
GSB 14-1511, Standard Samples for Determination of Cement Fineness
and Specific Surface
JC/T 956, Apparatus for Blaine method
3 Principle
This method is to test specific surface area of cement based on the theory that the resistance of a specific amount of air, passing through the cement layer with specific area ratio and set thickness, results in the variance in flow rate.in a cement layer with a specific area ratio, the size and quantity of cavity is the function of particle size, and also decides the flow rate of the air through the material layer.
4 Terms and definitions
For the purposes of this Standard, the following definitions and terms apply. 4.1 Specific surface (cement)
Total surface area of cement powder in unit mass, expressed in (cm2/g) or (m2/kg).
4.2 Area ratio
Ratio of the volume of the cavity among the particles in the sample material layer to the total volume of the sample material layer, expressed by (??). 5 Testing equipment and conditions
5.1 Air permeability apparatus
In this method, Blaine specific surface air permeability apparatus adopted, coming with two types - manual and automatic, shall meet the requirements of JC/T 956.
5.2 Drying box
Temperature control sensitivity. ??1??C
5.3 Analytic balance
Division value. 0.001 g
5.4 Second Counter
Accurate to 0.5s.
5.5 Cement sample
In accordance with the requirements of GB 12573, firstly sieve the cement sample with a 0.9 mm square-mesh sieve, dry it at 110??C??5??C for 1h, and cool it in a desiccator to the ambient temperature.
5.6 Reference material
GSB 14-1511 reference material or ones with same level; where there is
dispute about it, the one specified by GSB 14-1511 shall apply.
5.7 Pressure gauge liquid
Colored distilled water or colorless distilled water.
5.8 Filter paper
Intermediate speed ash-free filter specified in GB/T 1914.
5.9 Hydrargyrum
Hydrargyrum (analytically pure)
5.10 Conditions of laboratory
Relative humidity. not higher than 50%.
Figure 1 -- U-shaped pressure gauge for specific surface determination
6 Instrument calibration
6.1 The reference material specified in GSB 14-1511 or ones with same
mm
Temp U shaped pressure gauge
19/38 standard female
cone, solidly connected
with cylinder bottom
Valve
The height makes the material
layer thickness 15.0??0.5
The clearance between the temp
and the cylinder is less than 0.1
Permeability cylinder
caves
Filter paper
Perforated
plate
19/38 standard male cone is connected closely
with the top of the pressure gauge
level shall be used for instrument calibration. Where there is dispute about it, the former shall apply.
6.2 The calibration for instruments shall comply with the requirements of JC/T 956.
6.3 Calibration cycle
The calibration shall be conducted at least once yearly; where instruments and equipment are used frequently, they shall be calibrated one every half a year; the instruments after being repaired, shall be re-calibrated.
7 Operating procedures
7.1 Determination of cement density
The cement density determination shall comply with the requirements of GB/T 208.
7.2 Air leak detection
Chock the upper opening of the permeability cylinder with a rubber stopper, and connect the permeability cylinder to the pressure gauge; with the
exhauster, drawn part of air out from a limb of the pressure gauge, close the valve, and observe the air-leak condition. In case of air leak, seal the air-leak position with piston oil.
7.3 Determination of area ratio (??)
The area ratio of PI and PII cement shall be 0.500, and the one of other cements or fine materials shall be 0.530??0.005.
Where the test sample cannot be pressed to the position required in Article 7.5 by the above area ratio, the area ratio may be allowable to change. The adjustment of the area ratio shall be subject to that the test sample is compacted (pressed) with a 2000 g balance weight (Level 5 balance weight) to the position specified in Article 7.5.
7.4 Determining the sample required amount
The amount of the sample required is calculated according to formula (1). where,
m - Amount of the sample required, (g);
?? - Density of sample, g/cm3;
V - Volume of sample material layer, tested according to the requirements of JC/T 956, and expressed in (cm3);
?? - Area ratio of sample material layer.
7.5 Preparation of sample material layer
7.5.1 Place the perforated plate on the flange of the permeability cylinder, place a filter papers with a tamping bar on the perforated plate, setting the edge hereof level and pressing solid...

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