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GB/T 8074-2008: Testing method for specific surface of cement -- Blaine method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 8074: Historical versions
Similar standardsGB/T 8074-2008: Testing method for specific surface of cement -- Blaine method---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT8074-2008GB NATIONAL STANDARD OF THE PEOPLE’S 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 ContentsForeword ... 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 η and ࣁ at different temperatures ... 13ForewordThis 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 & Machinery Co., Ltd., Shaoxing Kente Mechanical & Electrical Co., Ltd., Hebei Kexi Instrument & 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 method1 ScopeThis 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 referencesThe 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 method3 PrincipleThis 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 definitionsFor 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 (ε).5 Testing equipment and conditions5.1 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 determination6 Instrument calibration6.1 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 procedures7.1 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 (ε) 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); ρ - Density of sample, g/cm3; V - Volume of sample material layer, tested according to the requirements of JC/T 956, and expressed in (cm3); Ε - 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... ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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