GB175-2023

Common portland cement

通用硅酸盐水泥

GB 175-2023 ist eine gültige verbindliche chinesische Nationalnorm: Common portland cement. Branchencluster: Elektronik. Schwerpunkt: Produktsicherheit. Inkrafttreten: 1. Juni 2024.

Die Anwendbarkeit hängt vom Produktumfang, dem Zertifizierungsweg, Bekanntmachungen der Behörden und Übergangsregeln ab. Fordern Sie eine Übersetzung an oder prüfen Sie die Quelle, bevor Sie diesen Eintrag für Compliance-Entscheidungen nutzen.

Compliance-Überblick

Dieser Überblick ist derzeit nur auf Englisch verfügbar.

Geltungsbereich und Anwendbarkeit

This standard applies to the classification, components, strength grades, technical requirements, and testing of common portland cement. It covers various cement types, including ordinary portland cement, slag portland cement, pozzolana portland cement, and composite portland cement. It is mandatory for all manufacturers and suppliers involved in the production and distribution of these cement varieties in China.

Technische Anforderungen

GB 175-2023 specifies stringent chemical and physical requirements for cement. Chemically, it defines limits for insoluble substances, loss on ignition, sulfur trioxide, magnesium oxide, and chloride ion content. A major update in this version is the inclusion of water-soluble chromium (VI) limits and radionuclide limits to ensure environmental and human safety. Compliance with these chemical thresholds is mandatory for market access. Physically, the standard dictates specific parameters for setting time, soundness, and strength. It introduces the requirement for autoclave soundness as a formal inspection item. The standard classifies cement into various strength grades (e.g., 32.5, 42.5, 52.5, 62.5) and specifies the required compressive and flexural strength for 3-day and 28-day curing periods. Manufacturers must ensure their products meet these mechanical performance benchmarks. Furthermore, the standard regulates the permissible components and materials used in production, such as granulated blast furnace slag, fly ash, and limestone. It specifically mandates that the methylene blue value for limestone and sandstone must not exceed defined limits, referencing GB/T 35164-2017 for testing procedures.

Prüfverfahren

The standard outlines various testing methodologies to verify compliance. Chemical composition is tested according to GB/T 176, while component quantification follows GB/T 12960. Physical properties are evaluated using specific methods: the mortar strength test follows GB/T 17671 (ISO method), and autoclave soundness is tested per GB/T 750. Additionally, the standard references GB 31893 for measuring water-soluble chromium (VI) and GB 6566 for determining radionuclide limits.

Häufige Fragen

What products are regulated under GB 175-2023?

It applies to common portland cement for general construction applications, including portland cement, slag portland cement, pozzolana portland cement, and composite portland cement.

What are the key updates in GB 175-2023 compared to the 2007 version?

The 2023 version introduces mandatory limits for water-soluble chromium (VI) and radionuclides. It also adds autoclave soundness requirements, modifies component definitions, and removes the 32.5 strength grades for composite portland cement. Manufacturers must update their quality control processes accordingly.

How does GB 175-2023 differ from ISO standards?

The standard references several ISO methods, such as GB/T 17671 for cement mortar strength testing (ISO method). However, it incorporates specific Chinese regulatory limits, like radionuclide safety and chromium (VI) restrictions, which may differ from standard international requirements.

The summary above provides a high-level overview of GB 175-2023. To ensure complete compliance for your cement 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 175-2023 today to access all detailed parameter tables, component specifications, and testing procedures.

Hinweise zur Anwendbarkeit

Normtyp: Produkt
CCS: Q11
ICS: 91.100.10
Zuständige Behörde: Ministry of Industry and Information Technology
Technisches Komitee: Ministry of Industry and Information Technology

Normbeziehungen

Ersetzt:GB 175-2007