GB 8076-2008 (GB8076-2008) & related versions
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GB 8076-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.30
Q 12
Replacing GB 8076-1997
Concrete Admixtures
混凝土外加剂
ISSUED ON. DECEMBER 31, 2008
IMPLEMENTED ON. DECEMBER 30, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 7
4 Codes ... 7
5 Requirements ... 8
6 Test Methods ... 10
7 Inspection Rules ... 19
8 Instructions, Package, Storage and Return of Products ... 21
Appendix A (Normative) Technical Condition of Reference Cement Used for
Inspecting Concrete Admixture Performance ... 24
Appendix B (Normative) Test Method of Chloride Ion Content in Concrete
Admixture (Chromatography of Ions) ... 26
Appendix C (Informative) Information on Concrete Admixture ... 30
Table 1 -- Performance Indexes of Test Concrete ... 9
Table 2 -- Uniformity Indexes ... 10
Table 3 -- Test Items and Needed Amount ... 12
Table 4 -- Admixture Measurement Items ... 20
Foreword
The compressive strength ratio, shrinkage ratio and relative durability listed in
Table 1 of Chapter 5 are mandatory; while the rest are recommended.
This standard replaces GB 8076-1997 Concrete Admixture and it differs from GB 8076
- 1997 in the following aspects.
--- Add high performance water reducer and pumping admixture; formulate technical
requirements and test methods;
--- Add Chapter “Codes of product”;
--- Classify high performance water reducer, high efficiency water reducer and
ordinary water reducer; namely, a certain type of admixture may be divided into
accelerating reducer, standard reducer and retarding reducer;
--- Delete “qualified product”, adjust the product technical index based on the
performance index of former Class I product;
--- Adjust technical indexes (such as solid content, water content and density etc.)
of uniformity items by referring to EN 934-2.2001 and JIS A 6204. 2006; Add
concrete test items for some products (for instance. slump and air content
change in one-hour duration);
--- Delete testing method on reinforcing steel rust in the former standard; establish
test method – use chromatography of ions to measure chloride ion content in
concrete admixture;
--- Improve the specific area of reference cement being that is specially used in
concrete admixture performance inspection.
Appendix A and Appendix B in this Standard are normative; while Appendix C is
informative.
This Standard was proposed by China Building Materials Federation.
This Standard shall be under the jurisdiction of National Technical Committee on
Cement Products of Standardization Administration of China.
Drafting organization of this Standard. China Building Materials Academy.
Participating drafting organizations of this Standard. Jiangsu Research Institute of
Building Science, Zhejiang Wulong Chemical Industrial Stock Co. Ltd, Tongji University,
Shanghai Architectural Institute of Science and Technology, China Academy of
Building Research, China Academy of Railway Sciences, Nanjing Hydraulic Research
institute, China Building Material Test & Certification Center, Suzhou Concrete Cement
Concrete Admixtures
1 Scope
This Standard specifies the terms, definitions, requirements, test procedures,
inspection rules, package, exit-factory, storage and return of admixtures used in
concrete.
This Standard is applicable to high performance water reducer (accelerating, standard
and retarding reducers), high efficiency water reducer (standard and retarding
reducers), ordinary water reducer (accelerating, standard and retarding reducers), air-
entraining water reducer, pumping admixture, early strength admixture, retarder and
air-entraining admixture, eight in total.
2 Normative References
The following standard contains provisions which, through reference in the following
text, constitute provisions of this standard. For dated reference, subsequent
amendments (excluding correction) to, or revisions of, any of these publications do not
apply. However, parties to agreements based on this standard are encouraged to
investigate the possibility of applying the most recent editions of the standards
indicated below. For undated references, the latest edition of the normative document
referred to applies.
GB/T176 Method for Chemical Analysis of Cement
GB/T 8074 Method for Cement Surface Area Testing Blaine Method
GB/T 8075 Definition, Classification, Nomenclature and Terms of Concrete
Admixtures
GB/T 8077 Method for Concrete Admixture Uniformity Test
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and
Judgment of Limiting Values
GB/T 14684 Building Sand
GB/T 14685 Pebbles and Crackle for Construction
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
crushed-stone result shall prevail.
6.1.4 Water
It shall meet the technical requirements for water consumption of concrete mixing
specified in JGJ 63.
6.1.5 Admixtures
The admixtures that need to be inspected.
6.2 Mixing proportion
Reference concrete mixing proportion is designed according to JGJ 55. The proportion
of test concrete added with non-air-entraining admixture shall be the same with that of
cement, sand and crushed-stone of the corresponding reference concrete. Mixing
proportion design shall meet the following provisions.
a) Cement consumption. per unit cement consumption of reference concrete and
test concrete mixed with high performance water reducer or pumping admixture
is 360 kg/m3; and per unit cement consumption of reference concrete and test
concrete mixed with other admixtures is 330 kg/m3.
b) Sand ratio. sand ratio of both reference concrete and test concrete mixed with
high performance water reducer or pumping admixture is 43% ~ 47%; sand ratio
of reference concrete and test concrete mixed with other admixtures is 36% ~
40%; but the sand ratio of test concrete added with air-entraining water reducer
or air-entraining admixture shall be 1% ~ 3% less than that of reference concrete.
c) Admixture amount to be added. it is added according to manufacturer's
instructions.
d) Water consumption. slump of reference concrete and test concrete added with
high performance water reducer or pumping admixture is controlled to be
(210±10)mm; the water consumption is minimum when slump is (210±10)mm;
slump of reference concrete and test concrete mixed with other admixtures is
controlled to be (80±10) mm.
Water consumption includes the water content contained in liquid admixture, sand and
stone.
6.3 Concrete mixing
Adopt the single-lay-shaft forced blender with nominal capacity of 60L and that meets
the requirements stipulated in JG 3036. The mixing amount of blender shall neither be
less than 20L nor greater than 45L.
When admixture is in powder, then, put the cement, sand, crushed-stone and
6.5.1 Measurement of slump and slump change in one-hour duration
One sample is taken from each concrete lot. Both slump and slump change in one-
hour duration are represented by the mean value of three test results. Among the three
test results, if either the maximum value or minimum value exceeds 10mm from the
medium value, then both the maximum and minimum values shall be abolished, and
the medium value is taken as the test result of this lot; when both maximum value and
minimum value exceeds 10mm from the medium value, then test shall be carried out
again.
Measured value of slump and slump change in one-hour duration is represented by
mm, and the result is rounded-off to 5mm.
6.5.1.1 Slump measurement
Concrete slump is measured in accordance with GB/T 50080; w...
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| Standard ID | GB 8076-2008 (GB8076-2008) | | Description (Translated English) | Concrete admixtures | | Sector / Industry | National Standard | | Classification of Chinese Standard | Q12 | | Classification of International Standard | 91.100.30 | | Word Count Estimation | 23,210 | | Date of Issue | 2008-12-31 | | Date of Implementation | 2009-12-30 | | Older Standard (superseded by this standard) | GB 8076-1997 | | Quoted Standard | GB/T 176; GB/T 8074; GB/T 8075; GB/T 8077; GB/T 8170; GB/T 14684; GB/T 14685; GB/T 50080; GB/T 50081; GBJ 82; JG 3036; JGJ 55; JGJ 63 | | Drafting Organization | China Building Materials Academy | | Administrative Organization | National Standardization Technical Committee cement products | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 23 of 2008 (No. 136 overall) | | Proposing organization | China Building Materials Federation | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, China National Standardization Administration Committee | | Summary | This Chinese standard specifies the admixture for cement concrete terms and definitions, requirements, test methods, inspection rules, packaging, factory, storage and returns. This standard applies to superplasticizer (early strength, standard, retarding), superplasticizer (standard, retarding), ordinary water reducer (early strength, standard, retarding), air entraining superplasticizer, pumping agent, early strength agent, retarder and air-entraining agent of eight classes of concrete admixtures. |
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