GB8076-2008

Concrete admixtures

混凝土外加剂

GB 8076-2008 は現行の中国強制国家規格です：Concrete admixtures。業界：電子。テーマ：製品安全。施行日：2009年12月30日。

適用可否は製品範囲、認証ルート、所管当局の通知、移行規定によって異なります。コンプライアンス判断に使う前に、翻訳をご依頼いただくか公式情報源をご確認ください。

コンプライアンス概要

この概要は現在英語のみで提供しています。

適用範囲

This standard applies to eight categories of concrete admixtures used in cement concrete, including high-performance water reducers (early-strength, standard, retarding), high-efficiency water reducers, normal water reducers, air-entraining water reducers, pumping agents, early-strength agents, retarders, and air-entraining agents. It is mandatory for manufacturers producing these admixtures for the Chinese construction market. It does not cover specialty admixtures outside these eight categories or non-cementitious binder systems.

技術要求

The standard specifies performance indicators for concrete containing admixtures compared to reference concrete. Mandatory requirements include compressive strength ratio, shrinkage ratio, and relative durability. Other recommended indicators cover water-reducing rate, bleeding rate ratio, air content, and setting time differences. It also defines homogeneity indicators for the admixtures themselves, such as chloride ion content, total alkali content, solid content, moisture content, and density, which must not exceed the manufacturer's declared control values. Manufacturers must ensure their products meet both the mandatory concrete performance ratios and the homogeneity limits. The standard references GB/T 8077 for homogeneity testing and introduces an ion chromatography method (Appendix B) for precise chloride ion determination.

試験方法

Testing involves preparing reference and test concrete under controlled conditions using specified materials like reference cement (per Appendix A), standard sand, and gravel. Key tests include measuring slump and slump loss over 1 hour, water-reducing rate, bleeding rate ratio, air content, and setting time differences using penetration resistance. Hardened concrete tests evaluate compressive strength ratio at various ages (1d, 3d, 7d, 28d), shrinkage ratio at 28 days, and relative durability through rapid freeze-thaw cycling. Homogeneity tests determine chemical and physical properties like chloride content and pH.

よくある質問

What products are regulated under GB 8076-2008?

It regulates eight types of concrete admixtures: high-performance water reducers, high-efficiency water reducers, normal water reducers, air-entraining water reducers, pumping agents, early-strength agents, retarders, and air-entraining agents.

Are there any updates from the previous version of GB 8076?

Yes, GB 8076-2008 replaced the 1997 version by adding high-performance water reducers and pumping agents, introducing product codes, classifying water reducers into early-strength, standard, and retarding types, and updating technical indicators by referencing EN 934-2 and JIS A 6204.

Which technical requirements are mandatory in GB 8076-2008?

The mandatory requirements in Table 1 are the compressive strength ratio, shrinkage ratio, and relative durability. All other performance indicators are recommended.

The summary above provides a high-level overview of GB 8076-2008. To ensure complete compliance for your products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 8076-2008 today to access all detailed parameters, tables, and testing procedures.

適用のヒント

種別: 製品
CCS: Q12
ICS: 91.100.30
所管部門: Ministry of Industry and Information Technology
技術委員会: Ministry of Industry and Information Technology