GB/T 8077-2012 in English

《GB/T 8077-2012混凝土外加剂匀质性试验方法》由TC197（全国水泥制品标准化技术委员会）归口，主管部门为中国建筑材料联合会。

1 Scope
This standard specifies the methods for testing uniformity of admixtures in cement concrete.
This standard is applicable to 11 categories of concrete admixtures including high performance water reducer (accelerating, standard, retarding), high range water reducer (standard, retarding), water reducer (accelerating, standard, retarding), air entraining and water reducing admixture, pumping aid, hardening accelerating admixture, retarder, air entraining admixture, waterproofing agent, antifreezing agent and accelerating agent.
2 Normative References
The following documents are indispensable for the application of this standard. For dated references, only the dated edition is applicable to this document. For undated references, the latest editions of the normative documents (including all the amendments) are applicable to this document.
GB/T 176 Methods for Chemical Analysis of Cement
GB/T 2419 Test Method for Fluidity of Cement Mortar
JC/T 681 Mixer for Mixing Mortars
JC/T 729 Mixer for Cement Paste
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
Repeatability conditions
Testing conditions that the same measured object is independently tested by the same operator using the same equipment in the same laboratory according to the same method in a short time.
3.2
Reproducibility conditions
Testing conditions that the same measured object is independently tested by different operators using different equipment in different laboratories according to the same method.
3.3
Repeatability limit
A value, under the repeatability conditions (3.1), that the absolute difference of two test results is less than or equal to this value in a probability of 95%.
3.4
Reproducibility limit
A value, under the reproducibility conditions (3.2), that the absolute difference of two test results is less than or equal to this value in a probability of 95%.
4 Basic Test Requirements

Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Basic Test Requirements
5 Solid Content
6 Moisture Content
7 Density
8 Fineness
9 pH Value
10 Surface Tension
11 Chloride Ion Content
12 Sodium Sulfate Content
13 Cement Paste Fluidity
14 Water Reduction Rate of Cement Mortar
15 Total Alkali Content
Appendix A (Informative) Examples for Calculating Chloride Ion Content (in Percentage) in Concrete Admixture by Potentiometric Titration