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

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GB/T 12573-2008: Sampling method for cement
GB/T 12573-2008
GB
NATIONAL STANDARD
OF THE PEOPLE’S 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 fo...