GB28375-2025

Fireproof coating for concrete structure

混凝土结构防火涂料

GB 28375-2025 é uma norma nacional chinesa obrigatória vigente: Fireproof coating for concrete structure. Setor: Químicos. Foco: Segurança de produtos. Entrada em vigor: 1 de jun. de 2026.

A aplicabilidade depende do escopo do produto, da via de certificação, dos avisos da autoridade competente e das regras de transição. Solicite uma tradução ou verifique a fonte antes de usar este registro em uma decisão de conformidade.

Visão geral de conformidade

Esta visão geral está disponível por enquanto apenas em inglês.

Escopo e aplicabilidade

This standard applies to fireproof coatings used on the surfaces of fire dikes, tunnels, and other concrete structures. It categorizes products into coatings for fire dikes, tunnels, and other industrial/civil concrete structures (indoor and outdoor). Engineers must verify if their product falls under these specific concrete protection categories to ensure compliance. It replaces the previous GB 28375-2012 edition.

Requisitos técnicos

The standard specifies comprehensive physical and chemical requirements for different coating categories. For tunnel and other concrete structure coatings, it mandates parameters such as drying time, bond strength (before and after freeze-thaw), dry density, and compressive strength. Manufacturers must ensure these baseline mechanical properties are met before fire testing. Environmental durability requirements are strictly defined, including resistance to acid, alkali, heat exposure, humidity, freeze-thaw cycles, salt spray, and UV radiation. Notably, the 2025 revision introduces new requirements for vibration resistance and UV radiation resistance for specific applications. For fire resistance performance, the standard classifies coatings based on fire exposure curves (building fiber, hydrocarbon, petrochemical, and RABT) and duration times ranging from 0.50h to 5.50h. Compliance requires passing the specified fire curve test without exceeding critical temperature limits on the concrete substrate. Toxicity of smoke generation is also regulated for certain categories, referencing GB/T 20285-2006.

Métodos de ensaio

Testing methods include evaluating drying time using the finger-touch method, and measuring bond strength via tensile loading. Durability tests involve immersing samples in acid/alkali solutions, exposing them to heat and humidity chambers, and conducting freeze-thaw and salt spray cycles. The newly added vibration resistance test (detailed in Annex A) subjects the coating to specific frequencies and amplitudes before testing bond strength. Fire resistance tests utilize C30 concrete slabs coated with the product, exposing them to standard fire curves while monitoring substrate and reinforcement temperatures. Accurate preparation and curing of test specimens are critical for valid results.

Perguntas frequentes

What products are regulated under GB 28375-2025?

It regulates fireproof coatings applied to concrete structures, specifically categorized for fire dikes, tunnels, and other indoor/outdoor concrete buildings.

Are there any updates from the previous GB 28375-2012 version?

Yes, the 2025 version updates the scope and classification, removes certain requirements for fire dike coatings, and introduces new technical requirements and test methods for vibration resistance and UV radiation resistance.

How is fire resistance classified in this standard?

Fire resistance is classified by fire curve types (building fiber, hydrocarbon, petrochemical, RABT) and duration times, ranging from 0.50h up to 5.50h. Manufacturers must select the appropriate curve based on the intended application environment.

The summary above provides a high-level overview of GB 28375-2025. 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 28375-2025 today to access all detailed parameters, tables, and testing procedures.

Indicações de aplicabilidade

Tipo: Segurança
CCS: C84
ICS: 13.220.50
Órgão competente: National Fire and Rescue Administration
Comitê técnico: National Technical Committee on Fire Protection of Standardization Administration of China

Relações

Substitui:GB 28375-2012