GB/T 8076-2025 Concrete admixtures English, Anglais, Englisch, Inglés, えいご
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ICS 13.220.10
CCS H 57
National Standard of the People's Republic of China
GB/T 8706-2025
Replaces GB/T 8706-2008
Concrete admixtures
混凝土外加剂
Issue date: 2025-10-31 Implementation date: 2026-05-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Classification, designation and marking
4.1 Classification and designation
4.2 Marking
5 Technical requirements
5.1 Physical and chemical properties
5.2 Properties of test concrete
6 Test methods
6.1 Test conditions
6.2 Test materials and samples
6.3 Concrete mix proportion
6.4 Concrete mixing
6.5 Specimen preparation, curing and number of samples
6.6 Chloride ion content
6.7 Emitted ammonia content
6.8 Residual formaldehyde content
6.9 Solid content, density, water content, fineness, alkali content, sodium sulfate content, pH value
6.10 Water reduction rate
6.11 Bleeding rate ratio
6.12 Air content and 1-hour air content change
6.13 Setting time difference
6.14 Slump and 1-hour slump change
6.15 Compressive strength ratio
6.16 Shrinkage ratio
6.17 Frost resistance index
6.18 Pressure bleeding rate ratio
6.19 Soundness
6.20 Penetration height ratio
6.21 Water absorption ratio (48h)
6.22 Compressive strength ratio at subzero temperature
6.23 Shrinkage ratio at subzero temperature
6.24 Penetration height ratio at subzero temperature
6.25 Strength loss ratio after 50 freeze-thaw cycles
7 Inspection rules
7.1 Batch number
7.2 Sampling
7.3 Inspection classification
7.4 Judgment rules
8 Product instructions, packaging, delivery, transportation and storage
8.1 Product instructions
8.2 Packaging
8.3 Delivery
8.4 Transportation and storage
Appendix A (Normative) Technical conditions for reference cement used in testing concrete admixtures
A.1 General provisions
A.2 Quality indicators
A.3 Test methods
A.4 Inspection rules
A.5 Packaging, storage and transportation
Appendix B (Normative) Technical conditions for special manufactured sand used in testing concrete admixtures
B.1 General provisions
B.2 Quality indicators
B.3 Test methods
B.4 Inspection rules
B.5 Packaging, storage and transportation
Appendix C (Informative) Information on concrete admixtures
C.1 Types and characteristics of admixtures
C.2 Main functions of admixtures
C.3 Main factors affecting the compatibility of cement and admixtures
C.4 Dosage of admixtures
C.5 Precautions for the application of admixtures
1 Scope
This document specifies the classification, designations, marking, technical requirements, test methods, inspection rules, product instruction, packaging, ex-factory delivery, transportation and storage of concrete admixtures (hereinafter referred to as "admixtures").
This document applies to the production and inspection of high-performance water reducers, high-range water reducers, normal water reducers, air-entraining water reducers, pumping aids, hardening accelerators, set retarders, air-entraining agents, concrete water repellent admixtures (hereinafter referred to as "water repellents") and concrete antifreeze admixtures (hereinafter referred to as "antifreeze admixtures") used in cement concrete.
2 Normative references
The contents of the following documents, through normative references in this text, constitute indispensable clauses of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including all amendments) applies.
GB/T 176 - Methods for chemical analysis of cement
GB/T 750 - Autoclave method for soundness of cement
GB/T 1346 - Test methods for water requirement of normal consistency, setting time and soundness of cement
GB/T 6679 - General rules for sampling solid chemical products
GB/T 6680 - General rules for sampling liquid chemical products
GB/T 8074 - Method of testing cement - Determination of specific surface area - Blaine method
GB/T 8075 - Terminology for concrete admixtures
GB/T 8077 - Test method for uniformity of concrete admixtures
GB/T 14684 - Sand for construction
GB/T 14685 - Pebble and crushed stone for construction
GB/T 31040 - Test method for released ammonia in concrete admixtures
GB/T 50080 - Standard for test method of performance on ordinary fresh concrete
GB/T 50081 - Standard for test method of mechanical properties on ordinary concrete
GB/T 50082 - Standard for test methods of long-term performance and durability of ordinary concrete
JC/T 729 - Cement paste mixer
JG/T 244 - Mixer for concrete test
JGJ 55 - Specification for mix proportion design of ordinary concrete
JGJ 63 - Standard of water for concrete
3 Terms and definitions
The terms and definitions defined in GB/T 8075 and the following apply to this document.
3.1
Emitted ammonia
Ammonia released from admixtures in alkaline environments.
3.2
Residual formaldehyde
Formaldehyde existing in admixtures in a free state and depolymerized from paraformaldehyde.
[SOURCE: GB/T 31040-2014, 3.2, modified]
3.3
Air-entraining and water-reducing admixture
An admixture whose primary function is water reduction and secondary function is air-entrainment.
3.4
Reference concrete
Concrete conforming to the test conditions specified in this document, without admixtures.
[SOURCE: GB/T 8075-2017, 6.13]
Note: Depending on its mix proportions, it includes Reference Concrete I and Reference Concrete II.
3.5
Test concrete
Concrete conforming to the test conditions specified in this document, containing admixtures.
[SOURCE: GB/T 8075-2017, 6.14, modified]
3.6
Ratio of bleeding rate at pressure
The ratio of the pressure bleeding rate of the test concrete with pumping aids to the pressure bleeding rate of the reference concrete.
[SOURCE: GB/T 8075-2017, 5.12.2, modified]
3.7
Ratio of water absorption
The ratio of the water absorption of the test concrete with water repellents to the water absorption of the reference concrete.
[SOURCE: GB/T 8075-2017, 5.39, modified]
3.8
Ratio of compressive strength at subzero temperature
The ratio of the compressive strength of the test concrete with antifreeze admixtures cured at subzero temperatures to the compressive strength of the standard-cured 28d reference concrete.
3.9
Ratio of shrinkage at subzero temperature
The ratio of the shrinkage rate of the test concrete with antifreeze admixtures cured at subzero temperatures to the shrinkage rate of the reference concrete.
3.10
Ratio of penetration height at subzero temperature
The ratio of the water penetration depth of the test concrete with antifreeze admixtures cured at subzero temperatures to the water penetration depth of the reference concrete.
3.11
Index of frost resistance
The relative dynamic elastic modulus of the test concrete with air-entraining agents or air-entraining water reducers after undergoing freeze-thaw cycle tests.
Note: The frost resistance test employs the rapid freeze-thaw method for 200 cycles.
3.12
Reference cement
Cement complying with the provisions in Appendix A of this document, specially used to inspect the performance of admixtures.
[SOURCE: GB/T 8075-2017, 6.10, modified]
3.13
Specialized manufactured sand
Manufactured sand complying with the provisions in Appendix B of this document, specially used to inspect the performance of admixtures.
4 Classification, designation and marking
4.1 Classification and designation
4.1.1 Admixtures are classified by state into liquid admixtures (designated as L) and solid admixtures (designated as S).
