GB/T 1345-2005 English PDF (GB/T1345-2005)

GB/T 1345-2005: The test sieving method for fineness of cement
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GB/T 1345-2005
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.10
Q 11
Replacing GB/T 1345-1991
The test sieving method for fineness of cement
ISSUED ON: JANUARY 19, 2005
IMPLEMENTED ON: AUGUST 01, 2005
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 ... 5
2 Normative references ... 5
3 Method principle ... 5
4 Terms and definitions ... 6
5 Instruments ... 6
6 Sample requirements ... 9
7 Operating procedures ... 9
8 Results calculation and processing ... 11
Annex A (normative) Calibration method for cement test sieves ... 13
The test sieving method for fineness of cement
1 Scope
This Standard specifies the sieving method for fineness of cement by 45 μm
square-aperture standard sieves and 80 μm square-aperture standard sieves.
This Standard applies to Portland cement, ordinary Portland cement, slag
Portland cement, pozzolanic Portland cement, fly ash Portland cement,
composite Portland cement, and other types of cement and powdery materials
designated to use this Standard.
2 Normative references
The following documents contain the provisions which, through reference in this
Standard, become the provisions of this Standard. For dated references, their
subsequent amendments (excluding corrigendum) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest versions of these
documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 5329 Test sieves and test sieving - Vocabulary
GB/T 6003.1 Test sieves of metal wire cloth
GB/T 6005 Test sieves - Metal wire cloth, perforated metal plate and
electroformed sheet - Nominal sizes of opening
GB 12573-1990 Sampling method of cement
GSB 14-1511 Standard for cement fineness and specific surface area
JC/T 728 Cement standard sieves and sieving apparatus
3 Method principle
This Standard uses 45 µm square-aperture sieves and 80 µm square-aperture
sieves to perform the sieving test on cement samples. The mass percentage of
the sieve residue on the sieve is used to represent the fineness of the cement
sample.
7.2 Vacuum sieving
7.2.1 Before the sieving test, PLACE the vacuum sieve on the sieve base,
COVER the sieve cover, CONNECT to the power supply, CHECK the control
system, and ADJUST the negative pressure to the range of 4000 Pa to 6000
Pa.
7.2.2 WEIGH the sample to the nearest 0.01 g, PLACE it in a clean vacuum
sieve, PLACE the sieve on the sieve base, COVER the sieve cover, CONNECT
to the power supply, and START the sieving analyzer to sieving continuously
for 2 min. During this period, if the sample is attached to the sieve cover, it can
lightly tap the sieve cover to drop the sample. After sieving, use a balance to
weigh all the sieve residue.
7.3 Wet sieving
7.3.1 Before the sieving test, CHECK that there is no mud or sand in the water,
ADJUST the water pressure and position of the wet sieve holder so that it can
operate normally, and CONTROL the distance between the bottom surface of
the nozzle and the sieving medium to 35 mm ~ 75 mm.
7.3.2 WEIGH the sample to the nearest 0.01 g, PLACE it in a clean wet sieve,
immediately FLUSH with fresh water until most of the fine powder passes;
PLACE the sieve on the wet sieve holder and continuously FLUSH using a
nozzle with a water pressure of 0.05 MPa ± 0.02 MPa for 3 min. After sieving,
flush the sieve residue into the evaporation dish with a small amount of water.
After all the cement particles have precipitated, carefully pour out the water, dry
and weigh all the sieve residue with a balance.
7.4 Manual sieving
7.4.1 WEIGH the cement sample to the nearest 0.01 g and POUR it into a
manual sieve.
7.4.2 USE one hand to hold the sieve and shake back and forth, and gently tap
with the other hand. The reciprocating shaking and tapping process shall be
kept close to horizontal. TAP at a speed of about 120 times per minute and
ROTATE 60° in the same direction every 40 times, so that the sample is evenly
distributed on the sieving medium, until the amount of sample passed per
minute does not exceed 0.03 g. Weigh all the sieve residue.
7.5 For other powdery materials or sieving tests using square-aperture sieves
other than 45 µm to 80 µm, the relevant parameters such as the size of the
sieve, the sample amount and the sieving time shall be specified.
7.6 Cleaning of test sieve
Annex A
(normative)
Calibration method for cement test sieves
A.1 Scope
The method specified in this annex is applicable to the calibration of cement
test sieves.
A.2 Principle
The ratio of the determined value of the standard sample on the test sieve to
the standard value of the standard sample is used to reflect the accuracy of the
aperture of the test sieve.
A.3 Test conditions
A.3.1 Standard sample of cement fineness
A standard sample that meets the requirements of GSB 14-1511, or of the same
grade. In case of dispute, the GSB 14-1511 standard sample shall prevail.
A.3.2 Instruments and equipment
Corresponding equipment that meets the requirements of Clause 5 of this
Standard.
A.4 Test sieve to be calibrated
The test sieve to be calibrated shall be cleaned, decontaminated, dried (except
wet sieve) in advance. Its temperature shall be the same as that of the
calibration test room.
A.5 Calibration
A.5.1 Calibration operation
PUT the standard sample in a dry and clean sealed jar, COVER with the lid and
SHAKE for 2 min to eliminate agglomeration. After standing for 2 min, STIR the
sample with a dry and clean stir bar. WEIGH the standard sample to the nearest
0.01 g in accordance with 7.1, and POUR the standard sample into the test
sieve to be calibrated without any loss in the middle. Then CARRY OUT the
sieving test operation according to 7.2 or 7.3 or 7.4. Each test sieve shall be
calibrated continuously by taking two standard samples, and no other tests to
GB/T 1345-2005
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.10
Q 11
Replacing GB/T 1345-1991
The test sieving method for fineness of cement
ISSUED ON: JANUARY 19, 2005
IMPLEMENTED ON: AUGUST 01, 2005
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 ... 5
2 Normative references ... 5
3 Method principle ... 5
4 Terms and definitions ... 6
5 Instruments ... 6
6 Sample requirements ... 9
7 Operating procedures ... 9
8 Results calculation and processing ... 11
Annex A (normative) Calibration method for cement test sieves ... 13
The test sieving method for fineness of cement
1 Scope
This Standard specifies the sieving method for fineness of cement by 45 μm
square-aperture standard sieves and 80 μm square-aperture standard sieves.
This Standard applies to Portland cement, ordinary Portland cement, slag
Portland cement, pozzolanic Portland cement, fly ash Portland cement,
composite Portland cement, and other types of cement and powdery materials
designated to use this Standard.
2 Normative references
The following documents contain the provisions which, through reference in this
Standard, become the provisions of this Standard. For dated references, their
subsequent amendments (excluding corrigendum) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest versions of these
documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 5329 Test sieves and test sieving - Vocabulary
GB/T 6003.1 Test sieves of metal wire cloth
GB/T 6005 Test sieves - Metal wire cloth, perforated metal plate and
electroformed sheet - Nominal sizes of opening
GB 12573-1990 Sampling method of cement
GSB 14-1511 Standard for cement fineness and specific surface area
JC/T 728 Cement standard sieves and sieving apparatus
3 Method principle
This Standard uses 45 µm square-aperture sieves and 80 µm square-aperture
sieves to perform the sieving test on cement samples. The mass percentage of
the sieve residue on the sieve is used to represent the fineness of the cement
sample.
7.2 Vacuum sieving
7.2.1 Before the sieving test, PLACE the vacuum sieve on the sieve base,
COVER the sieve cover, CONNECT to the power supply, CHECK the control
system, and ADJUST the negative pressure to the range of 4000 Pa to 6000
Pa.
7.2.2 WEIGH the sample to the nearest 0.01 g, PLACE it in a clean vacuum
sieve, PLACE the sieve on the sieve base, COVER the sieve cover, CONNECT
to the power supply, and START the sieving analyzer to sieving continuously
for 2 min. During this period, if the sample is attached to the sieve cover, it can
lightly tap the sieve cover to drop the sample. After sieving, use a balance to
weigh all the sieve residue.
7.3 Wet sieving
7.3.1 Before the sieving test, CHECK that there is no mud or sand in the water,
ADJUST the water pressure and position of the wet sieve holder so that it can
operate normally, and CONTROL the distance between the bottom surface of
the nozzle and the sieving medium to 35 mm ~ 75 mm.
7.3.2 WEIGH the sample to the nearest 0.01 g, PLACE it in a clean wet sieve,
immediately FLUSH with fresh water until most of the fine powder passes;
PLACE the sieve on the wet sieve holder and continuously FLUSH using a
nozzle with a water pressure of 0.05 MPa ± 0.02 MPa for 3 min. After sieving,
flush the sieve residue into the evaporation dish with a small amount of water.
After all the cement particles have precipitated, carefully pour out the water, dry
and weigh all the sieve residue with a balance.
7.4 Manual sieving
7.4.1 WEIGH the cement sample to the nearest 0.01 g and POUR it into a
manual sieve.
7.4.2 USE one hand to hold the sieve and shake back and forth, and gently tap
with the other hand. The reciprocating shaking and tapping process shall be
kept close to horizontal. TAP at a speed of about 120 times per minute and
ROTATE 60° in the same direction every 40 times, so that the sample is evenly
distributed on the sieving medium, until the amount of sample passed per
minute does not exceed 0.03 g. Weigh all the sieve residue.
7.5 For other powdery materials or sieving tests using square-aperture sieves
other than 45 µm to 80 µm, the relevant parameters such as the size of the
sieve, the sample amount and the sieving time shall be specified.
7.6 Cleaning of test sieve
Annex A
(normative)
Calibration method for cement test sieves
A.1 Scope
The method specified in this annex is applicable to the calibration of cement
test sieves.
A.2 Principle
The ratio of the determined value of the standard sample on the test sieve to
the standard value of the standard sample is used to reflect the accuracy of the
aperture of the test sieve.
A.3 Test conditions
A.3.1 Standard sample of cement fineness
A standard sample that meets the requirements of GSB 14-1511, or of the same
grade. In case of dispute, the GSB 14-1511 standard sample shall prevail.
A.3.2 Instruments and equipment
Corresponding equipment that meets the requirements of Clause 5 of this
Standard.
A.4 Test sieve to be calibrated
The test sieve to be calibrated shall be cleaned, decontaminated, dried (except
wet sieve) in advance. Its temperature shall be the same as that of the
calibration test room.
A.5 Calibration
A.5.1 Calibration operation
PUT the standard sample in a dry and clean sealed jar, COVER with the lid and
SHAKE for 2 min to eliminate agglomeration. After standing for 2 min, STIR the
sample with a dry and clean stir bar. WEIGH the standard sample to the nearest
0.01 g in accordance with 7.1, and POUR the standard sample into the test
sieve to be calibrated without any loss in the middle. Then CARRY OUT the
sieving test operation according to 7.2 or 7.3 or 7.4. Each test sieve shall be
calibrated continuously by taking two standard samples, and no other tests to