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GB/T 12573-2008 English PDF (GBT12573-2008)

GB/T 12573-2008 English PDF (GBT12573-2008)

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GB/T 12573-2008: Sampling method for cement

This standard specifies the terms and definitions, sampling tools, sampling locations, sampling procedures, sampling amount and sample preparation and testing of exit-factory cement.
GB/T 12573-2008
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 91.100.10
Q 11
Replacing GB/T 12573-1990
Sampling method for cement
ISSUED ON. JUNE 30, 2008
IMPLEMENTED ON. APRIL 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Sampling tools ... 6
5 Sampling locations ... 6
6 Sampling procedures ... 6
7 Sampling volume ... 7
8 Sample preparation and testing ... 7
9 Packaging and storage ... 8
10 Sampling list ... 8
Appendix A (Informative) Cement sampler ... 9
Appendix B (Normative) 28d compressive strength homogeneity test ... 12 Foreword
This standard replaces GB 12573-1990 ?€?Sampling method for cement?€?.
As compared with GB 12573-1990, main changes of this standard are as
follows.
- MODIFY the standard from mandatory standard into recommended
standard;
- ADD the normative references (Chapter 2 of this version);
- DELETE the material requirements of the vessels used to store sample
(3.6.1 of 1990 version; 9.1 of this version);
- MODIFY the Appendix A ?€?Division sample physical and chemical
properties test?€? of 1990 version into the Appendix B ?€?28d compressive
strength homogeneity test?€? of this version, and USE the cement 28d
compressive strength homogeneity for indication;
- INCREASE the frequency of homogeneity test from cement 28d
compressive strength variation factor greater than 6% to greater than
3.0% (A.2.4 of 1990 version; B.2.3 of this version).
Appendix A of this standard is informative, AND Appendix B is normative. This standard was proposed by the China Building Materials Federation.
This standard shall be under the jurisdiction of the National Cement
Standardization Technical Committee (SAC/TC 184).
The drafting organizations of this standard. Building Materials Industry Technical Supervision Research Center, China Building Materials Science Research Institute, Yunnan State-Owned Cement Honghe Co., Ltd.
The main drafters of this standard. Gan Xiangchen, Jin Fujin, Zhao Tingting, Chen Bin, Jiang Lizhen, Liu Chen, Wu Xu.
This standard was first released in December 1990, AND this is the first revision.
Sampling method for cement
1 Scope
This standard specifies the terms and definitions, sampling tools, sampling locations, sampling procedures, sampling amount and sample preparation and testing of exit-factory cement.
This standard applies to the sampling of the exit-factory cement.
2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB 175 Ordinary Portland cement
GB/T 4131 Nomenclature and terminology of cement
3 Terms and definitions
The terms and definitions as defined in GB 175 and GB/T 4131 AND the
following terms and definitions apply to this standard.
3.1
Manual sampling
It refers to use of manual sampler to collect the cement sample.
3.2
Automatic sampling
It refers to use of automatic sampler to collect the cement sample.
3.3
Lot
It refers to a batch of unit products which are produced under the same conditions AND collected for the purposes of sampling inspection.
3.4
Lot number
It refers to the code representative of the lot.
3.5
Unit sample
It refers to the appropriate amount of cement sample which is taken from the same location.
3.6
Composite sample
It refers to sample which is formed by mixing thoroughly all the unit samples which are taken from different locations from the same lot number.
3.7
Laboratory sample
It refers to the sample which is taken from the composite sample AND used for the purposes of exit-factory cement quality testing.
3.8
Retained sample
It refers to the sample which is taken from the composite sample AND used for the purposes of re-testing arbitration.
3.9
Division sample
It refers to the unit sample taken from one lot number in the order of 1/10 which is used for homogeneity test.
3.10
Common cement
It refers to the cement which is used for general civil engineering.
4 Sampling tools
4.1 Manual sampler
Manual sampler can be designed and manufactured accordingly, AND the
common manual sampler is as shown in Appendix A.
4.2 Automatic sampler
Automatic sampler can be designed and manufactured accordingly, as shown in Appendix A.
5 Sampling locations
Sampling shall be carried out at a representative location AND shall not be sampled in a polluted environment. Generally it is sampled in the following locations.
a) In cement delivery pipelines;
b) Bagged cement yard;
c) Bulk cement unloading yard or cement transport equipment.
6 Sampling procedures
6.1 Manual sampling
6.1.1 Bulk cement
When the depth of the obtained cement does not exceed 2 m, USE the bulk cement sampler to take sample from each lot number. By rotating the sampler inner tube control switch, INSERT it to a certain depth of the cement at an appropriate location; CLOSE it and PULL it out carefully; PLACE the sample taken into the vessel which complies with the requirements of 9.1. AND the unit sample taken for each time shall be as consistent with each other as possible. 6.1.2 Bagged cement
From each lot number, randomly TAKE not less than 20 bags of cement; USE the bagged cement sampler to take sample; INSERT the sampler into the
cement bag along the diagonal line direction; USE the thumb to press the air hole and carefully PULL out the sampling tube; PLACE the sample taken into the vessel which complies with the requirements of 9.1. AND the unit sample taken for each time shall be as consistent with each other as possible. 6.2 Automatic sampling
USE the automatic sampler to take sample. This device is generally installed as close to the cement packing machine as possible OR in the pipeline of the bulk vessel, to take sample from the cement flow, AND place the sample taken into the vessel which complies with the requirements of 9.1.
7 Sampling volume
7.1 The sampling volume of the composite sample shall comply with the
relevant cement standards.
7.2 The sampling volume of the division sample shall comply with the following requirements.
a) Bagged cement. TAKE at least 6 kg from one bag for every 1/10 number; b) Bulk cement. TAKE at least 6 kg within 5 minutes for every 1/10 number. 8 Sample preparation and testing
8.1 Composite sample
MAKE the unit sample of cement which is taken from each lot number pass the 0.9 mm square hole sieve; MIX it thoroughly; DIVIDE the sample to the fixed volume as required by the relevant standards in one time or several times; equally DIVIDE it into the laboratory sample and retained sample. The
laboratory sample is tested in accordance with the requirements of the relevant standards. AND the retained sample is stored as specified in Chapter 9 for the purpose of arbitration. AND it is not allowed for the sample to be mixed with debris or caking.
8.2 Division sample
The 10 divisions taken from each lot number shall pass through a 0.9 mm square hole sieve, respectively, AND they shall not be mixed. It shall be subject to the 28d compressive strength homogeneity test in accordance with the requirements of appendix B. AND it is not allowed for the sample to be mixed with debris or caking.
9 Packaging and storage
9.1 Samples obtained shall be stored in airtight containers, AND the retained sample shall be attached with seal. The vessel shall be clean, dry,
moisture-proof, closed, not easy to damage AND not affect the performance of cement.
9.2 As for the vessel storing the retained sample, it shall add a clear and hard to be erased sealing chop for at least one position, indicating the number, sampling time, sampling location, and sampling person. AND if there is only one marking, it shall be located at the outer wall of the vessel.
9.3 The retained samples shall be sealed for storage, AND the storage period shall comply with the provisions of the corresponding cement standards. The laboratory sample and the division sample shall also be properly stored. 9.4 The retained samples shall be stored in a dry and ventilated environment. 10 Sampling list
After the sample is obtained, the sampling staff shall be responsible for completing the sampling list which shall in...

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