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GB 175-2023: Common Portland cement 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 175: Historical versions
GB 175-2023: Common Portland cement---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/GB175-2023GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 91.100.10 CCS Q 11 Replacing GB 175-2007 Common portland cement Issued on. NOVEMBER 27, 2023 Implemented on. JUNE 01, 2024 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Classification... 6 5 Components and materials... 6 6 Strength grade... 9 7 Technical requirements... 9 8 Test methods... 11 9 Inspection rules... 12 10 Packaging, marking, transportation and storage... 15ForewordThis document is drafted in accordance with the rules provided in GB/T 1.1-2020 Directives for standardization - Part 1.Rules for the structure and drafting of standardizing documents. This document replaces GB 175-2007 Common portland cements; compared with GB 175-2007, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) Change the provisions on cement components (see 5.1; 5.1 of the 2007 edition); b) Delete the provisions on natural gypsum of “grade II and above” (see 5.2.2.1 of the 2007 edition); c) Change the technical requirements for granulated blastfurnace slag or granulated blastfurnace slag powder, fly ash, and pozzolanic materials (see 5.2.3, 5.2.4 and 5.2.5; 5.2.3 of the 2007 edition); d) Delete the provisions on “active mixed materials” and “inactive mixed materials” (see 5.2.3 and 5.2.4 of the 2007 edition); e) Change the requirements for limestone and sandstone, and add the inspection method for methylene blue value (see 5.2.6; 5.2.4 of the 2007 edition); f) Delete the “kiln dust” material (see 5.2.5 of the 2007 edition); g) Delete the strength grades of 32.5 and 32.5R for composite portland cement (see 6.3 of the 2007 edition); h) Add the limit and determination method of water-soluble chromium (VI) (see 7.2 and 8.3); i) Change the regulations on alkali content (see 7.3; 7.2 of the 2007 edition); j) Add the requirements for qualified autoclave for soundness and list it as a type inspection item (see 7.4.2.2 and 9.2.2); k) Change the 3-day compression strength index of cement of each strength grade (see 7.4.3; 7.3.3 of the 2007 edition); l) Change the fineness requirements (see 7.4.4; 7.3.4 of the 2007 edition); m) Add limits and determination method of cement radionuclides (see 7.5 and 8.9); n) Change the requirements for component determination (see 8.1; 8.1 of the 2007 edition); o) Delete the provisions on production capacity below 10×104 t in “Numbering and sampling” (see 9.1 of the 2007 edition); p) Change the ex-factory inspection items (see 9.2.1; 9.3 of the 2007 edition); q) Add type inspection, as well as requirements for inspection frequency and determination rules (see 9.2.2, 9.3.2); r) Add requirements for product quality certification materials (see 9.4); s) Change the regulations on inspection report (see 9.5; 9.5 of the 2007 edition); t) Change the regulations on acceptance basis (see 9.6.1; 9.6.1 of the 2007 edition); u) Change the regulations on the inspection agency when quality disputes occur (see 9.6.2, 9.6.3; 9.6.2, 9.6.3 of the 2007 edition); v) Change the regulations on packaging (see 10.1; 10.1 of the 2007 edition). Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying patents. This document is proposed and managed by the Ministry of Industry and Information Technology of the People’s Republic of China. The previous versions of this document and the documents which are replaced by this document are as follows. -- First published as GB 175-1956 in 1956, first revised in 1962, second revised in 1977, third revised in 1985, fourth revised in 1992, and fifth revised in 1999; -- In the sixth revision in 2007, it incorporated the contents of GB 1344-1999 Portland blastfurnace-slag cement, portland pozzolana cement and portland fly- ash cement and GB 12958-1999 Composite portland cement (The previous versions of GB 1344-1999 are. GB 1344-1956, GB 1344-1962, GB 1344-1977, GB 1344-1985, GB 1344-1992; the previous versions of GB 12958-1999 are. GB 12958-1981, GB 12958-1991); -- This is the seventh revision. Common portland cement1 ScopeThis document specifies the classification, components and materials, strength grades, technical requirements, test methods, inspection rules and packaging, marking, transportation and storage of common portland cement. This document applies to common portland cement.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document. GB/T 176, Methods for chemical analysis of cement GB/T 203, Granulated blastfurnace slag used for cement production GB/T 750, Autoclave method for soundness of portland cement GB/T 1345, The test sieving method for fineness of cement GB/T 1346, Test methods for water requirement of normal consistency, setting time and soundness of the portland cement GB/T 1596, Fly ash used for cement and concrete GB/T 2419, Test method for fluidity of cement mortar GB/T 2847, Pozzolanic materials used for cement production3 Terms and definitionsNo terms and definitions need to be defined in this document.4 ClassificationCommon portland cement is divided into portland cement, ordinary portland cement, blastfurnace-slag portland cement, fly ash portland cement, pozzolana portland cement and composite portland cement according to the type and dosage of mixed materials. The components and codes of each type shall comply with the provisions of 5.1.5 Components and materials5.1 Components The components of common portland cement shall comply with the provisions of Table 1, Table 2 and Table 3, respectively. 5.2 Materials 5.2.1 Portland cement clinker The hydraulic cementitious material with calcium silicate as the main mineral component, which is obtained by grinding raw materials mainly containing CaO, SiO2, Al2O3, and Fe2O3 into fine powder in appropriate proportions, and burning them until they are partially melted. 5.2.2 Gypsum 5.2.4 Fly ash Fly ash shall comply with the technical requirements (except for strength activity index and alkali content) specified in GB/T 1596.The ammonium ion content in fly ash shall not exceed 210 mg/kg. 5.2.5 Pozzolanic materials Pozzolanic materials shall comply with the technical requirements (except for the 28- day compression strength ratio of cement mortar) specified in GB/T 2847. 5.2.7 Cement grinding aids Grinding aids are allowed to be added during cement grinding, where the amount added shall not exceed 0.5% of the cement mass. The grinding aids shall comply with the technical requirements specified in GB/T 26748.6 Strength grade6.1 The strength of portland cement and ordinary portland cement is divided into six grades. 42.5, 42.5R, 52.5, 52.5R, 62.5 and 62.5R. 6.2 The strength of blastfurnace-slag portland cement, fly ash portland cement and pozzolana portland cement is divided into six grades. 32.5, 32.5R, 42.5, 42.5R, 52.5 and 52.5R.7 Technical requirements7.1 Chemical requirements Chemical requirements shall comply with Table 4. 7.2 Water-soluble chromium (VI) in cement Water-soluble chromium (VI) in cement shall comply with the requirements of GB 31893. 7.3 Alkali content The alkali content in cement shall be expressed as the calculated value of w(Na2O) + 0.658w(K2O). When the buyer requires low-alkali cement, it shall be determined through negotiation between the buyer and the seller. 7.4 Physical requirements 7.4.1 Setting time The initial setting time of portland cement shall be no less than 45 minutes, and the final setting time shall be no more than 390 minutes. The initial setting time of ordinary portland cement, blastfurnace-slag portland cement, fly ash portland cement, pozzolana portland cement and composite portland cement shall be no less than 45 minutes, and the final setting time shall be no more than 600 minutes. 7.4.2 Soundness 7.4.3 Strength The strength of common portland cement at different ages shall comply with the requirements in Table 5. 7.4.4 Fineness The fineness of portland cement is expressed in terms of specific surface area, which shall be no less than 300 m2/kg and no more than 400 m2/kg. 7.5 Limits of radionuclides The internal exposure index IRa shall not be greater than 1.0, and the external exposure index Ir shall not be greater than 1.0.8 Test methods8.1 Components Test according to GB/T 12960.During the determination, the measured data shall be rounded off. 8.2 Insoluble, loss on ignition, magnesium oxide, sulfur trioxide, chloride ion and alkali content Perform according to GB/T 176. 8.3 Water-soluble chromium (VI) in cement Follow the provisions in GB 31893. 8.4 Setting time Follow the provisions in GB 1346. 8.5 Soundness 8.6 Strength Perform the strength test method according to GB/T 17671.When testing the mortar strength of pozzolana portland cement, fly ash portland cement, composite portland cement and ordinary portland cement mixed with pozzolanic materials, the water consumption is determined such that the fluidity of mortar is not less than 180 mm on the basis of 0.50 water-cement ratio. 8.7 Specific surface area Follow the provisions in GB/T 8074. 8.8 45 μm sieve residue Follow the provisions in GB/T 1345. 8.9 Radioactivity Follow the provisions in GB 6566.9 Inspection rules9.1 Numbering and sampling When (or before) cement leaves the factory, it shall be numbered and sampled according to the same type and strength grade. Bagged cement and bulk cement shall be numbered and sampled separately. Each number is a sampling unit. The cement factory number is stipulated as follows according to the annual designed production capacity. 9.2 Cement inspection 9.2.1 Ex-factory inspection The ex-factory inspection items are 5.1, 7.1, 7.4.1, 7.4.2.1, 7.4.3, and 7.4.4. 9.2.2 Type inspection The type inspection includes 5.1 and all the content of Chapter 7.In any of the following cases, type inspection shall be carried out. 9.3 Determination rules 9.3.1 Ex-factory inspection 9.3.2 Type inspection 9.4 Ex-factory of cement The cement can only leave the factory after it is confirmed that the technical indicators and packaging quality meet the requirements. 9.5 Inspection report The content of the inspection report shall include the ex-factory inspection items such as the document number, cement type, code, factory number, mixed material type and dosage, as well as density (only for portland cement), water requirement of normal consistency, type and dosage of gypsum and grinding aids, and other technical requirements stipulated in the contract, etc. 9.6 Delivery and acceptance ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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