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Articles of 7.1, 7.3.1, 7.3.2, 7.3.3 and 9.4 in this national standard are obligatory clauses and the rest are commendatory clauses.
This national standard is non-equifinal to European cement standard EN 197-1:2000.
This standard will replace the three Standards from the date of its implementation: GB175-1999 Portland Cements and Ordinary Portland Cement, GB1344-1999 Slag Portland Cement, Portland-pozzolana cement, Fly-ash Portland Cement, GB12958-1999 Composite Portland Cement.
Compared with GB175-1999, GB1344-1999 and GB12958-1999, this national standard has the following changes:
- Full-text obligatory clauses are changed to provisional obligatory clauses (Foreword of this edition).
- Add definition for common Portland cement (Chapter 3 in this Edition).
- Cancel cements' definition for all kinds (Chapter 3 in original editions of GB175-1999, GB1344-1999, GB12958-1999)
- Combine Composition and Materials into one chapter (Chapter 4 in original editions of GB175-1999, GB1344-1999, GB12958-1999)
- For ordinary Portland cement, “when active admixture was mixed in, the maximum mixed amount should not exceed 15% and it is permitted to use kiln ash no more than 5% of the cement's mass and non-active admixture no more than 10% of the cement’s mass instead” is changed into “mixed active admixture >5%, ≤20%, and it is permitted to use kiln ash(in compliance with Article 5.2.5) no more than 5% of the cement's mass and non-active admixture(in compliance with Article 5.2.4) no more than 8% of the cement’s mass instead”(Article 3.2 in Original edition of GB175-1999, Article 5.1 in this edition).
- Slag content in slag Portland cement is changed from “20%~70%” into “>20%, ≤70%”and is classified as Type A and Type B. Type A’s mixed slag >20%, ≤50%, code number is P.S.A; Type B’s mixed slag>50%, ≤70% (Article 3.1 in original edition GB1344-1999, Article 5.1 in this edition; )
- Volcanic ash content in Portland-Pozzolana cement is changed from “20%~50%” into “>20%, ≤40%” (Article 3.2 in original edition GB1344-1999, Article 5.1 in this edition; )
- Mixed substances in composite Portland cement change from “greater than 15% but no greater than 50%” into “>20%, ≤50%” (Chapter 3.3 in original edition GB12598-1999, Article 5.1 in this edition; )
- Add granulated blast-furnace slag powder in the materials (Article 5.2.3 and Article 5.2.4)
- Cancel granulated chrome iron slag, granulated-calcium enhanced liquid slag, granulated carbon chrome iron slag, granulated blast furnace slag bearing titania and other admixture, and newly developed mixed materials compliable with Annex A; cancel Annex A (Article 4.2 and Article 4.3 and Annex A in original edition of GB12958-1999)
- Add M-type mixed gypsum and cancel A-type hard gypsum (Chapter 3 in GB175-1999, GB1344-1999 and GB12958-1999, Article 5.2.1.1 in this edition).
- Mixed grinding aids change from “no greater than 1% of the mass of cement” into “no greater than 0.5% of the mass of cement” (Article 4.5 in original editions GB175-1999, GB1344-1999 and GB12958-1999, Article 5.2.6 in this edition);
- Cancel 32.5 and 32.5R for ordinary cement’s strength level (Chapter 5 in original edition GB175-1999 and Chapter 6 in this edition);
- Change “the magnesium oxide content in clinkers” of slag Portland cement, Portland-Pozzolana cement, Fly-ash Portland cement and composite Portland cement to “the magnesium content in cement”. For types P.S.A, P.P, P.F, and P.C, magnesium contents should be no greater than 6.0% and a note should be given that “if magnesium content in cement is greater than 6.0%, this kind of cement should pass the autoclave test and is proved be qualified”; no requirement for P.S.B. (Article 6.1 in the original editions GB1344-1999 and GB 12598-1999, Article 7.1 in this edition)
- Add the content limit of Chloride ion and Chloride ion’s content should be no greater than 0.06% (Article 7.1 in this edition);
- Change the strength indicators of ordinary Portland cement of all strength levels to make them identical to those of the Portland cement; change the strength indicators of composite Portland cements of all strength levels to make them identical to those of the slag Portland cement, Portland-Pozzolana cement, Fly-ash Portland cement (Article 6.6 in original edition GB12958-1999, 7.3.3 in this edition)
- 45 μm Square-hole sieve residue no greater than 30% will be taken as an indicator (Article 7.3.4 in this edition);
- Add rules and regular verification for cement composition test method.
- Expand the applicable scope of the regulation “decide the water amount according to 0.05 water-cement ratio and mortar mobility no less than 180 mm” from regulated cement types to Portland-Pozzolana cement, Fly-ash Portland cement, composite Portland cement and ordinary Portland cement mixed with volcanic ash content (Article 7.5 in original edition GB 1344-1999 and Article 8.5 in this edition)
- Add serial number and sample for annual capacity “over 200x104 t”, that is: greater than 200x104 t but no greater than 4000 t as a serial number; change “greater than 1200,000 tons no greater than 1200 tons as a serial number” to “120x104 t~ 200x104, no greater than 2400 t as a serial number” (Article 8.1 in original editions GB175-1999,GB1344-1999,GB12958-1999, Article 9.1 in this edition)
- Change “Finished cement’s strength level should be guaranteed, other technical specifications should comply with related specifications of this national standard” into “cement can be shipped only when all cement’s technical indicators and packaging quality comply with requirements” (Article 8.2 in original editions GB175-1999,GB1344-1999,GB12958-1999, Article 9.2 in this edition).
- Add factory inspection (Article 9.3 in this edition).
- Cancel the rejected product testing (Article 8.3.1 in original edition GB175-1999,GB1344-1999,GB12958-1999);
- Cancel the regulations for the fineness and mixed amount of admixture in unacceptable products. The test rule changes into “according to the test result, if the products comply with 7.1, 7.3,.1, 7.3.2, 7.3.3, then it is rated as acceptable products; if the products fail to comply with 7.1, 7.3.1, 7.3.2, 7.3.3, then it is rated as unacceptable products”. (Article 8.3.2 in original editions GB175-1999, GB1344-1999, GB12958-1999, Article 9.4.1 and 9.4.2 in this edition).
- In inspection report, add “other technical specifications by the contract” (Article 8.4 in original editions GB175-1999, GB1344-1999, GB12958-1999, Article 9.5 in this edition.)
- In delivery and acceptance report, add “soundness arbitration should be finished within ten days of its sampling.”(Article 9.6.2 in this edition)”
- As for the package marking, “Both sides of Portland-Pozzolana cement, Fly-ash Portland cement and composite Portland cement should be printed in black” changes into “Both sides of Portland-Pozzolana cement, Fly-ash Portland cement and composite Portland cement should be printed in black or blue (Article 9.2 in original editions GB175-1999, GB1344-1999, GB12958-1999, Article 10.2 in this edition).
This national standard is proposed by China Building Materials Industry Association.
This national standard is under the jurisdiction of Technological Standard Committee for Cement (SAC/TC184).
Primary unit drafting organization: China Building Materials Academy
Units that have taken part in the drafting: Tangshan Jidong cement holding co., Ltd., Fujian cement holding Co., ltd., Shandong Conglin Corporation, Dujiangyan Lafaji Co., Ltd., Yunan Guozi Cement Honghe Co., Ltd.,Yun’nan Guozi Cement Kunming Co., Ltd., Hefei Cement Designing Institute, Guangdong Architecture Science Institute, Shandong Cement Quality Supervision and Inspection Center, Shanghai Building Scicence Institute Co., ltd., Building Materials Industrial Technological Intelligence Rearch Center, GuanLu Corporation Shandong Wanli Cement Co., Ltd., and Tangshan Longfeng Cement Co., Ltd.
This national standard is drafted mainly by: Yan Bilan, Jiang Lizhen, Xiao Zhongming, Liu Chen, Zhang Qiuying, Chen Ping, Huo Chunming, Xi Jinsong, Song Lichun, Wang Xin and Guo Junping.
This national standard shall replace the following historical editions
- GB175-1956, GB175-1962, GB175-1977, GB175-1985, GB175-1992, GB175-1999;
- GB1344-1956, GB1344-1962, GB1344-1977, GB1344-1985, GB1344-1992, GB1344-1999;
- GB12958-1981, GB12958-1991, GB12958-1999.
Common Portland Cements
1 Scope
This national standard specifies that common Portland cements’ compositions, materials specifications, strength levels, technical specifications, test methods, test rules, packaging, marking, transportation, storage, and so on.
This national standard is applicable to common Portland cements.
2 Normative Reference
The following normative documents contain provisions which, through reference in this text, constitute provisions of this national standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the normative document referred to applies.
GB/T176 Chemical analysis method of cement (GB/T176-1996, eqv ISO680:1990)
GB/T203 Granulated slag ash used for cement
GB/T750 Autoclave method for soundness of cement
GB/T1345 Fineness test method for cement (sieve processing method)
GB/T1346 Water amount for standard testing consistency, setting time and test method for the soundness of cement (GB/T1346-2001, eqv ISO9597:1989)
GB/T1596 Fly-ash used for cement and concrete
GB/T2419 Test method for cement mortar mobility
GB/T2847 Volcanic ash admixture
GB/T5483 Gypsum and hard gypsum
GB/T8074 Cement’s specific surface area test method (Blaine)
GB9774 Package bag of cement
GB12573 Cement’s sampling
GB/T12960 Examination of cement’s composition of certain amount
GB/T17671 Test method for the cement mortar’s strength level (ISO method) (GB/T17671-1999, idt ISO679:1989)
GB/T18046 Granulated blast-furnace slag powder used in cement and concrete
JC/T420 Chemical analysis method of chloride in cement materials
JC/T667 Cement’s grinding aids
JC/T742 Rotary Kiln ash blended in cement
3 Terms and Definitions
The following terms and definitions are applicable to this national standard.
Common Portland cement:
It is a kind of cement matrix composed of Portland cement clinkers and appropriate gypsum, plus specified admixture.
4 Classifications
Common Portland cement specified in this national standard include Portland cement, ordinary Portland cement, slag Portland cement, Portland-Pozzolana cement, Fly-ash Portland cement and composite Portland cement. Compositions and codes of all kinds should comply with specifications in Article 5.1.
5 Composition and Material
5.1 Composition
Compositions of common Portland cement should comply with specifications of Table 1.
Table 1 %
Type Code number Composition (mass fraction)
Clinker + Gypsum Granulated blast-furnace slag Volcanic ash admixture fly ash Limestone
Portland Cement P.I 100 - - - -
P.II ≥95 ≤5 - - -
≥95 - - - ≤5
Ordinary Portland Cement P.O ≥80, <95 >5, ≤20a -
Slag Portland Cement P.S.A ≥50, <80 >20, ≤50b - - -
P.S.B ≥30, <50 >50, ≤70b - - -
Portland-Pozzolana Cement P.P ≥60, <80 - >20, ≤40c - -
Fly-ash Portland cement P.F ≥60, <80 - - >20, ≤40d -
Composite Portland Cement P.C ≥50, <80 >20, ≤50e
Materials of the composition refer to active admixture in compliance with Article 5.2.3 of this national standard. The materials are permitted to be replaced by non-active admixture in compliance with Article 5.2.4 of this national standard with its mass no greater than 8% of the cement’s or kiln ash in compliance with Article 5.2.5 of this national standard no greater than 5% of the cement’s mass.
Materials of the composition refer to active admixture in compliance with GB/T 203 or GB/T 18046.The materials are permitted to be replaced by active admixture in compliance with Article 5.2.3 of this national standard with its mass no greater than 8% of the cement’s or non-active admixture in compliance with Article 5.2.4 or kiln ash in compliance with Article 5.2.5 of this national standard no greater than 5% of the cement.
Materials of the composition refer to active admixture in compliance with GB/T 2847.
Materials of the composition refer to active admixture in compliance with GB/T 1596.
Materials of the composition are composed of two plus kinds of active admixture in compliance with Article 5.2.3 of this national standard or/and non-active admixture in compliance with Article 5.2.4 of this national standard. It is permitted to replace the admixture with kiln ash in compliance with Article 5.2.5 of this national standard no greater than 8% of the cement’s mass. If it is mixed with slag, the mixed admixture should not be identical with that of Slag Portland Cement.
5.2 Materials
5.2.1 Cement clinker of Portland cement
Materials are mainly composed of CaO, SiO2, Al2O3 and Fe2O3. According to a proper proportion, they are grinded into fine powders, burned until partially fused and the hydraulic refractory gelatinous substance is obtained with its main composition calcium silicate. Mineral substance of calcium silicate should be no less than 66%. Mass ratio of Calcium oxide and silicon oxide should be no less than 2.0.
5.2.2 Gypsum
Natural gypsum:
It should be gypsum or mixed gypsum higher than Class 2 (including Class 2) of Classification G, Classification M, and Classification A specified in GB/T 5483.
Industrial by-product Gypsum:
By-product from industrial production is mainly composed of calcium sulfate. Before the industrial by-product gypsum is put in use, it should be tested and proved to be harmless to the cement’s property.
5.2.3 Active admixture
The admixture should be granulated blast-furnace slag, granulated blast-furnace slag powder, fly-ash and volcanic ash content in compliance with GB/T203, GB/T18046, GB/T1596 and GB/T2847.
5.2.4 Non-active admixture
Admixture composed of granulated blast-furnace slag, granulated blast-furnace slag powder, fly-ash and volcanic ash content with its activity indicator lower than the standard specified in GB/T203, GB/T18046, GB/T1596 and GB/T2847; limestone, sandstone and limestone alumina content should be no greater than 2.5%.
5.2.5 Kiln ash
It should comply with specifications of JC/T742.
5.2.6 Grinding aids
Grinding aids are permitted to be added when the cement is powdered but the added amount should be no greater than 0.5% of the cement’s mass and the grinding aids should be in compliance with specifications in JC/T667.
6 Strength Level
6.1 Strength levels of Portland cement: 42.5, 42.5R, 52.5, 52.5R, 62.5, 62.5R six levels.
6.2 Strength levels of ordinary cement: 42.5, 42.5R, 52.5, 52.5R four levels
6.3 Strength levels for slag, volcanic ash, fly-ash and composite cement are classified as 32.5, 32.5R, 42.5, 42.5R, 52.5 and 52.5R six levels.
1 Scope
2 Standard reference
3 Terms and definitions
4 Classifications
5 Composition and material
5.1 Composition
5.2 Materials
5.2.1 Cement clinker of Portland cement
5.2.2 Gypsum
5.2.3 Active admixture
5.2.4 Non-active admixture
5.2.5 Kiln ash
5.2.6 Grinding aids
6 strength level
7 Technical specifications
7.1 Chemical Indicators
7.2 Alkali content
7.3 Physical requirement
7.3.1 Setting time
7.3.2 Soundness
7.3.3 Strength level
7.3.4 Fineness (selective indicator)
8 Test method
8.1 Composition
8.2 Insoluble substance, loss on ignition, magnesium oxide, sulfur trioxide and alkali content
8.3 Autoclave method for soundness
8.4 Chloride ion
8.5 Water requirement of normal consistency, setting time and soundness of the portland cements
8.6 Strength level
8.7 Specific surface
8.8 80 μm and 45 μm sieve residue
9. Test rules
9.1 Serial number and sampling
9.2 Cement’s being delivered out of factory
9.3 Factory inspection
9.4 Criterion rule
9.
9.
9.5 Inspection report
9.6 Delivery and acceptance
10. Package, marking, transportation and storage
10.1 Package
10.2 Marking
10.3 Transportation and storage
