Can UHPC Curtain Wall Panels Achieve a Class A Fire Rating?

UHPC curtain wall panels can stably achieve the Class A non-combustible fire rating, primarily based on the Classification for Burning Behavior of Building Materials and Products (GB 8624-2012). Their main components (cement, quartz sand, steel fibers) are all non-combustible materials. Qinglong UHPC curtain wall panels have passed authoritative testing with a combustion performance classification of Class A1 and a fire resistance limit of ≥1.5 hours, fully meeting the fire protection requirements of all types of buildings.

I. Core Basis for Meeting the Fire Rating: Materials and Composition

Material composition provides the inherent advantage in fire performance. Core components: UHPC mainly consists of low-alkali cement (non-combustible Class A1), quartz sand (non-combustible Class A1), steel fibers (non-combustible Class A1), and mineral admixtures (non-combustible Class A1), containing no combustible ingredients. All Qinglong UHPC ingredients have passed fire testing, with each individual combustion performance rated Class A1. Combustion performance testing: According to the GB 8624-2012 standard, UHPC panels show no flame spread and release no toxic smoke when burning, with a smoke toxicity rating of Class t0 (non-toxic). Qinglong's test reports show no dripping after combustion and smoke production ≤5m², far below the Class A standard limits. Fire resistance limit: 25mm thick UHPC panels have a fire resistance limit of ≥1.0 hours, 30mm thick ≥1.5 hours, and 40mm thick ≥2.0 hours. Qinglong's standard curtain wall panels are ≥30mm thick with a fire resistance limit of ≥1.5 hours.

II. Fire-Resistant Structural Design: Enhancing Overall Fire Performance

Rational structural design improves the overall fire resistance of the curtain wall. Fire compartmentation: The gaps between the curtain wall and the main structure are filled with fire-resistant rock wool (thickness ≥100mm, density ≥100kg/m³). Qinglong's fire-resistant rock wool has a Class A1 combustion performance and thermal conductivity ≤0.04W/(m·K), balancing fire protection with thermal insulation. Joint fire protection: Metal connections such as hangers and bolts are coated with fire-retardant coatings (thickness ≥5mm, fire resistance limit ≥1.5 hours) to prevent metal components from softening at high temperatures. Qinglong's joint fire-retardant coatings have passed fire resistance tests with no deformation within 1.5 hours. Seam fire protection: Fire-rated sealants (fire resistance limit ≥1.0 hours) are selected for joint sealing. Qinglong's fire-resistant sealant is highly compatible with UHPC, with no cracking after combustion.

III. Qinglong's Fire Protection Assurance and Project Practice

Fire reliability is verified through both technology and practice. Production control: The combustible impurity content of raw materials is strictly controlled (≤0.1%), and dense, pore-free casting is ensured during pouring to prevent flame penetration. Qinglong's raw materials have a combustible impurity content ≤0.08% and density ≥2.4g/cm³. Testing and certification: Every batch of products is submitted for third-party testing with Class A fire resistance test reports issued. Qinglong's testing coverage reaches 100% with no non-conforming batches. Project cases: The UHPC interior wall panels for the Huawei Songshan Lake Terminal project achieved a Class A1 fire rating and a fire resistance limit of 1.5 hours, passing special fire protection acceptance; the light-transmitting panels at Shanghai New World Plaza achieved an overall fire resistance limit ≥1.5 hours after fire-resistant structural design, meeting the fire protection requirements for commercial buildings.