GB 8076-2008 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 8076-2008 | English | 115 |
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Concrete Admixtures
| Valid |
| GB 8076-1997 | English | 679 |
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Concrete admixtures
| Obsolete |
| GB 8076-1987 | English | RFQ |
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Concrete admixtures
| Obsolete |
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GB 8076-2008: Concrete Admixtures---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/GB8076-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.30
Q 12
Replacing GB 8076-1997
Concrete Admixtures
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
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
3 Terms and Definitions
For the purpose of this standard, the following terms and definitions AND those
established in GB/T 8075 apply.
3.1 High performance water reducer
It is superior to high efficiency water reducer in the following aspects. higher water-
reducing rate, better slump keeping performance, less dry shrinkage and a certain
performance of air entraining.
3.2 Reference cement
The cement that meets the requirements in Appendix A of this Standard and is specially
used to inspected concrete admixture performance.
4 Codes
The following types of admixtures are represented by the following codes.
5 Requirements
5.1 Performance indexes of test concrete
Performance of concrete added with admixture shall meet the requirements listed in
Table 1.
5.2 Uniformity indexes
Uniformity index shall meet requirements of Table 2.
6 Test Methods
6.1 Materials
6.1.1 Cement
Cement specified in Appendix A of this Standard is adopted.
6.1.2 Sand
Medium sand which meets the requirements of Area II in GB/T 14684; but the fineness
modulus is 2.6 ~ 2.9 and silt content is less than 1 %.
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.
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.
6.4 Sample preparation and sample amount needed in test
6.4.1 Sample preparation
Concrete sample is prepared and cured according to GB/T 50080; however, concrete
pre-curing temperature is (20±3) °C.
6.4.2 Test items and sample amount
Test items and amount are listed in Table 3.
6.5 Performance test method of concrete mixtures
6.6 Performance test method of hardened concrete
6.6.1 Compressive strength ratio measurement
Compressive strength ratio is represented by the ratio of compressive strengths
BETWEEN concrete added with admixture AND same-duration of reference concrete.
It is calculated according to Formula (9), accurate to 1%.
6.7 Uniformity test methods
6.7.1 Chloride ion content measurement
Chloride ion content is measured according to GB/T 8077 or the method specified in
Appendix B of this Standard. For arbitration, the methods stated in Appendix B are
applied.
6.7.2 Measurement of solid content, total alkali amount, water content, density,
fineness, pH value and sodium sulfate content
It shall be measured according to GB/T 8077.
7 Inspection Rules
7.1 Sampling and lot number
7.1.1 Spot-sample and mixing-sample
Spot-sample refers to a sample obtained from the product in one-time production.
Mixing-sample refers to the sample that is obtained after three or more spot-samples
are mixed equivalently and evenly.
7.1.2 Lot number
Manufacturer shall number the products by lot according to output and manufacturing
equipment condition. Each lot number of admixture, with the same type and whose
mixing proportion is greater than 1% (including 1%), is 100t; and each lot number of
admixture, whose mixing proportion is less than 1%, is 50t.
7.2 Samples and reserved-sample
Samples taken from each lot shall be thoroughly and evenly mixed, which shall be
divided into two equal-portions. In which, one portion is tested according to the items
listed in Table 1 and Table 2, and the other is sealed and conserved for half a year.
authorities for retest or arbitration.
7.3 Inspection classification
7.3.1 Exit-factory inspection
Items of exit-factory inspection of each lot of admixtures are inspected according to the
items specified in Table 4 and based on different varieties.
7.3.2 Type inspection
Type inspection items include all performance indexes in Chapter 5.Under any of the
following conditions, type inspection shall be carried out.
7.5 Retest
Retest shall be carried out with sealed and reserved samples. If user-organization
requires for on-site sampling, then the requirements shall be specified in procurement
contract in advance, and mixing-sample shall be taken on-site when both personnel
from the manufacturer and user-organization are present.
8 Instructions, Package, Storage and Return of Products
8.1 Product instructions
When products leave the factory, product instructions shall be provided; it shall include
the following content at least.
8.2 Packages
Powder admixture may be packed with woven bag lined with plastic bag; liquid
admixture may be packed with plastic bucket or metal bucket. Error of net mass
package shall be not greater than 1%. Liquid admixture may also be packed in tank-
truck in bulk.
8.3 Product exit-factory
In case of any of the following conditions, the products shall not leave the factory.
incomplete technical documents (product instructions, certificate and inspection report
etc.), non-conformant package, insufficient mass, deteriorated product by moisture,
and expired products. Controlling value of product uniformity index shall be indicated
in related technical material clearly.
8.4 Storage
Admixture shall be stored in special warehouse or in fixed place for well-keeping; take
the principle of easy to identify, convenient to check and delivery. During handling
period, products shall be taken and placed gently to prevent damage. In addition,
damping shall be avoided during transportation.
8.5 Return of products
Under specified storage condition and in valid period, if user-organization discovers
that admixture performance is inconsistent with those specified in this Standard after
retest, it shall be allowed to return or replace.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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