GB/T 21371-2019 PDF English
US$100.00 · In stock · Download in 9 secondsGB/T 21371-2019: By-product gypsum used in cement Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 21371: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 21371-2019 | English | 100 |
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By-product gypsum used in cement
| Valid |
| GB/T 21371-2008 | English | 279 |
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By-product gypsum used in cement
| Obsolete |
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GB/T 21371-2019: By-product gypsum used in 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/GBT21371-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.10
Q 11
Replacing GB/T 21371-2008
By-Product Gypsum Used in Cement
ISSUED ON: OCTOBER 18, 2019
IMPLEMENTED ON: SEPTEMBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Technical Requirements ... 6
5 Test Methods ... 7
6 Judgment Rules ... 8
7 Transportation and Storage ... 9
By-Product Gypsum Used in Cement
1 Scope
This Standard specifies the terms and definitions, technical requirements, test methods and
judgment rules, transportation and storage of industrial by-product gypsum used in cement.
This Standard is applicable to the acceptance and use of industrial by-product gypsum for
adjusting the setting time of cement.
2 Normative References
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document; for the
undated documents, only the latest version (including all the amendments) is applicable to this
document.
GB/T 1346 Standard Test Method for Water Requirement for Normal Consistency Setting
Time and Soundness of the Portland Cement
GB/T 2419 Test Method for Fluidity of Cement Mortar
GB/T 5483 Natural Gypsum
GB/T 5484 Methods for Chemical Analysis of Gypsum
GB 6566 Limit for Radionuclides in Building Materials
GB/T 17671 Test Method of Cement Mortar Strength (ISO Method)
JC/T 1083 Test Method for Compatibility of Cement and Water-Reducing Agent
3 Terms and Definitions
For the purposes of this Document, the following terms and definitions apply.
3.1 By-product gypsum
The general term for by-products with calcium sulfate as the main component that are
discharged from industrial manufacturing.
NOTE 1: Also known as chemical gypsum, synthetic gypsum.
S – mass fraction of SO3, expressed by percentage (%);
w – mass fraction of crystal water, expressed by percentage (%).
5.3 Radioactive material limits
It shall be tested according to GB 6566.
5.4 Influence of industrial by-product gypsum on cement properties
5.4.1 Preparation of contrast cement
It is the P·I Portland cement, which is prepared by the Category-G and Class-2 above (including
Class-2) gypsum specified in GB/T 5483, with SO3 content of 2.0%~2.5%, 80μm sieve residue
of less than 4%, and specific surface area of 350m2/kg±10m2/kg.
5.4.2 Preparation of test cement
It is P·I Portland cement that is prepared by using Portland cement clinker for preparing contrast
cement and by replacing natural gypsum with 30%~100% of the assessed industrial by-product
gypsum. During the preparation, the 80μm sieve residue of the cement shall be controlled to
less than 4%, the specific surface area shall be within the range of 350m2/kg ± 10m2/kg, and
the difference between the SO3 content and the contrast cement SO3 content shall be within
0.2%.
5.4.3 Standard consistency water consumption, setting time and stability of cement
It shall be tested according to GB/T 1346.
5.4.4 Fluidity of cement mortar
The preparation of cement mortar is carried out according to GB/T 17671; and the fluidity test
operation of cement mortar is carried out according to GB/T 2419.
5.4.5 Strength of cement mortar
It shall be tested according to GB/T 17671.
5.4.6 Compatibility of cement and water-reducing agent
It shall be tested according to JC/T 1083.
6 Judgment Rules
When any one of 4.1, 4.3, 4.4, 4.5 and 4.6 does not meet the requirements of this Standard, it
cannot be used in the manufacturing of cement.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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