2021年10月31日 · 内容提示： This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. Designation: C494/C494M − 17 Standard Specif i cation for ...

2024年8月6日 · This specification covers the materials and the test methods for use in chemical admixtures to be added to hydraulic-cement concrete mixtures in the field.

ASTM C494 outlines the requirements and test methods for chemical admixtures used in hydraulic-cement concrete mixtures. It classifies admixtures into eight types based on their primary function: Type S – Specific performance admixtures (e.g., corrosion inhibitors, shrinkage-reducing admixtures).

This standard is issued under the fixed designation C494/C494M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.

2025年3月13日 · astm c494/c494m-17的标准全文信息,1.1 本规范涵盖了用作化学外加剂的材料，在现场添加到水硬性水泥混凝土混合物中，用于以下八种类型所示的目的： 1.1.1“a 型”；减水剂、1.1.2b型缓凝剂、1.1.3c型速凝剂、1.1.4d型减水缓凝剂, 1.1.5e 型减水速凝外加剂，1.1.6f 型减 …

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2019年12月15日 · This specification covers materials for use as chemical admixtures to be added to hydraulic-cement concrete mixtures for the purpose or purposes indicated for the eight types as follows: Type A -Water-reducing admixtures, Type B -Retarding admixtures, Type C -Accelerating admixtures, Type D -Water-reducing and retarding admixtures,