GB/T 200-2025Moderate-heat portland cement, low-heat portland cement (English PDF)
中热硅酸盐水泥、低热硅酸盐水泥
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 31, 2025
Implementation date
November 1, 2026
Scope
GB/T 200-2025 is the English-translated version of 中热硅酸盐水泥、低热硅酸盐水泥.
GB/T 200-2025 is the Chinese national standard for moderate-heat Portland cement and low-heat Portland cement. It specifies their composition and materials, codes and strength grades, technical requirements, test methods, inspection rules, exit-factory, delivery and acceptance, and packaging, marking, transport and storage.
Moderate-heat cement carries the code P·MH with strength grade 42.5 and low-heat cement the code P·LH with grades 32.5 and 42.5, while the clinker is bounded by limits on tricalcium silicate, dicalcium silicate, tricalcium aluminate and free calcium oxide.
The technical requirements cover magnesium oxide, sulfur trioxide, loss on ignition, insoluble matter, chloride ions and water-soluble chromium (VI), with the alkali content and the silicate and aluminate contents as selective indicators.
It replaces GB/T 200-2017, was issued on 31 October 2025 and applies from 1 November 2026.
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Document preview — GB/T 200-2025
National Standard of the People's Republic of China
- ICS
- 91.100.10
- Classification
- Q 11
- Replacing
- GB/T 200-2017
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword3
- 1 Scope6
- 2 Normative References6
- 3 Terms and Definitions7
- 4 Composition and Materials7
- 5 Codes and Strength Grades7
- 6 Technical Requirements8
- 7 Test Methods10
- 8 Inspection Rules11
- 9 Exit-factory, Delivery and Acceptance12
- 10 Packaging, Marking, Transportation and Storage13
- Appendix A (normative) Calculation of Mineral Composition of Medium-heat Cement and Low-heat Cement15
1 Scope
This document specifies the composition and materials, codes and strength grades, technical requirements, test methods, inspection rules, exit-factory, delivery and acceptance, packaging, marking, transportation and storage of moderate-heat Portland cement (hereinafter referred to as "moderate-heat cement") and low-heat Portland cement (hereinafter referred to as "low-heat cement").
This document applies to both moderate-heat Portland cement and low-heat Portland cement.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 176 Method for Chemical Analysis of Cement
GB/T 750 Test Method for Autoclave Expansion of Cement
GB/T 1346 Test Methods for Water Requirement of Standard Consistency, Setting Time and Soundness of the Portland Cement
GB/T 5483 Natural Gypsum
GB 6566 Limits of Radionuclides in Building Materials
GB/T 8074 Testing Method for Specific Surface of Cement - Blaine Method
GB/T 9774 Sacks for Packing Cement
GB/T 12573 Sampling Method for Cement
GB/T 12959 Test Methods for Heat of Hydration of Cement
GB/T 17671 Test Method of Cement Mortar Strength (ISO method)
GB/T 21372 Portland Cement Clinker
GB/T 26748 Cement Grinding Aids
GB 31893 Limit and Determination of the Water-soluble Chromium (VI) Content for Cement
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Moderate-heat Portland cement
A hydraulic cementing material with moderate heat of hydration, made by grinding Portland cement clinker of appropriate composition, and the addition of an appropriate amount of gypsum.
3.2 Low-heat Portland cement
A hydraulic cementing material with low heat of hydration, made by grinding Portland cement clinker of appropriate composition, and the addition of an appropriate amount of gypsum.
4 Composition and Materials
4.1 Moderate-heat Cement Clinker
The content of tricalcium silicate (3CaO·SiO2, C3S) in moderate-heat cement clinker is not greater than 55.0%, the content of tricalcium aluminate (3CaO·Al2O3, C3A) is not greater than 6.0%, and the content of free calcium oxide (f-CaO) is not greater than 1.0%.
4.2 Low-heat Cement Clinker
The content of dicalcium silicate (2CaO·SiO2, C2S) in low-heat cement clinker is not less than 40.0%, the content of tricalcium aluminate is not greater than 6.0%, and the content of free calcium oxide is not greater than 1.0%.
4.3 Natural Gypsum
Natural gypsum shall conform to Class G or Class M Grade II (inclusive) or above as specified in GB/T 5483.
4.4 Cement Grinding Aids
Cement grinding aids may be added during the grinding of medium-heat cement and low-heat cement. The amount added shall not exceed 0.5% of the mass of medium-heat cement or low-heat cement, and the cement grinding aids shall conform to the provisions of GB/T 26748.
5 Codes and Strength Grades
Medium-heat cement, code P·MH, strength grade 42.5;
Low-heat cement, code P·LH, strength grades are divided into 32.5 and 42.5.
6 Technical Requirements
6.1 Chemical Composition
6.1.1 Magnesium oxide (MgO)
The content (mass fraction) of magnesium oxide in medium-heat cement and low-heat cement shall not exceed 5.0%.
If medium-heat cement and low-heat cement pass the autoclave soundness test, the content (mass fraction) of magnesium oxide in medium-heat cement and low-heat cement can be relaxed to 6.0%.
6.1.2 Sulfur trioxide (SO3)
The content (mass fraction) of sulfur trioxide shall not exceed 3.5%.
6.1.3 Loss on ignition (LOI)
The loss on ignition (mass fraction) shall not exceed 3.0%.
6.1.4 Insoluble matter (IR)
The content (mass fraction) of insoluble matter shall not exceed 0.75%.
6.1.5 Chloride ions (Cl-)
The content (mass fraction) of chloride ions shall not exceed 0.06%.
6.1.6 Water-soluble chromium (VI) in medium-heat cement and low-heat cement
The water-soluble chromium (VI) content shall comply with the requirements of GB 31893.
6.2 Alkali Content (selective indicator)
The alkali content is expressed as w(Na2O) + 0.658 w(K2O). When the user requests low-alkali medium-heat cement or low-heat cement, the alkali content (mass fraction) in the medium-heat or low-heat cement shall not exceed 0.60% or shall be determined through negotiation between the buyer and seller.
6.3 Tricalcium Silicate, Dicalcium Silicate, and Tricalcium Aluminate (selective indicator)
When requested by the user, the content of tricalcium silicate (C3S), dicalcium silicate (C2S) and tricalcium aluminate (C3A) in medium-heat cement and low-heat cement shall comply with the provisions of Table 1 or shall be determined through negotiation between the buyer and […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 176Methods for chemical analysis of cement
- GB/T 750Test method for autoclave expansion of cement
- GB/T 1346Test methods for water requirement of standard consistency, setting time and soundness of the Portland cement
- GB/T 5483Natural gypsum
- GB 6566Limits of radionuclides in building materials
- GB/T 8074Testing method for specific surface of cement - Blaine method
Editions of GB/T 200
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 200-2025 | Moderate-heat portland cement, low-heat portland cement | current edition | Current |
| GB/T 200-2017 | Moderate-heat Portland cement, low-heat Portland cement | previous edition | In force |
| GB 200-2003 | [GB/T 200-2003] Moderate heat Portland cement Low heat Portland cement Low heat Portland slag cement | previous edition | Obsolete |
| GB 200-1989 | Moderate heat portland cement--Low heat portland slag cement | previous edition | Obsolete |
This page sells the current edition, GB/T 200-2025. Earlier editions are listed for reference only.
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Related Standards
GB 31893-2015 — Limit and determination of the water-soluble Chromium (VI) content for cement
GB 6566-2010 — Limits of radionuclides in building materials
GB/T 12573-2008 — Sampling method for cement
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