GRC Production Process Explained: A Refined Manufacturing Flow from Raw Materials to Finished Products

Exquisite craftsmanship creates premium GRC, with the quality code hidden in every process. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP field, Qinglong Group knows well that the production process is the core factor determining the performance and aesthetics of GRC products. From the “Chinese Red Lantern” shape of the Wuhan Hanxiu Theater to the 120,000 m² wave-shaped roof of the Hainan International Convention and Exhibition Center, the birth of premium GRC is inseparable from standardized, refined manufacturing processes.

#Raw Material Pre-treatment: Laying the Foundation for Quality GRC production begins with the precise proportioning of premium raw materials. Core materials include sulphoaluminate cement, quartz sand, alkali-resistant glass fiber and special admixtures. Qinglong Group adopts a high-standard raw material screening system: cement must comply with the GB/T 20472-2006 standard, quartz sand particle gradation is controlled within 0.15-0.6mm, and the alkali-resistant glass fiber uses imported alkali-free roving treated with an alkali-resistant coating to ensure stable raw material performance. All raw materials must undergo pre-treatment such as drying, screening and metering upon arrival, with moisture content strictly controlled within 3% to avoid affecting subsequent forming quality.

#Mold Making: Replicating Design Details Molds are the key to realizing GRC shapes; steel molds, GRP molds or silicone molds can be selected according to project requirements. For complex double-curved shapes, such as the irregular curved facade of the Guangxi New Media Center, Qinglong uses BIM technology for parametric mold design, creating master molds through 3D scanning and 3D printing to ensure mold precision error ≤2mm. Mold surfaces must be polished and coated with release agent to ensure a smooth surface for GRC components after demolding and reduce later repair work.

#Forming Process: Selecting Suitable Solutions as Needed GRC forming processes are mainly divided into the spraying method, the premix casting method and the spray-suction method. Qinglong flexibly selects among them according to different project characteristics: large flat components use the premix casting method, with mechanical mixing ensuring uniform fiber distribution; complex special-shaped components, such as the “Dongguan Grass” weaving shape of the Dongguan Women and Children's Activity Center, use the spraying method with fiber content controlled at 3%-5% to ensure the flexural strength of components; extra-large components combine the spray-suction method, reducing self-weight while improving density. Temperature and humidity must be monitored in real time during forming, with ambient temperature maintained at 5-35℃.

#Curing and Post-treatment: Ensuring Stable Performance Curing is the core stage in GRC strength development. Qinglong adopts a combined “steam curing + natural curing” mode. After forming, components first undergo 24-hour steam curing with temperature controlled at 45-55℃ and humidity ≥90% to accelerate strength gain; they are then transferred to natural curing for no less than 7 days to ensure stable strength development. The post-treatment stage includes surface grinding, edge trimming and hole repair. For stone-imitation and carved components, such as the chiseled-surface GRC of the Panzhihua Third-Front Construction Museum, five-axis engraving machines are used for fine processing, achieving a simulation fidelity of over 95%.

#Quality Inspection: Layer-by-Layer Checks Before Qualified Shipment Every batch of GRC products must undergo multiple tests, including flexural strength, tensile strength and water absorption. Premium products achieve flexural strength ≥20MPa, complying with the Technical Standard for Building Applications of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018). Qinglong has established a full-process quality traceability system, recording production information via RFID chips, and any product failing inspection is reworked without exception. Over the years, thanks to rigorous production processes, Qinglong GRC products have been successfully applied in multiple landmark projects worldwide and exported to overseas markets such as Australia and Saudi Arabia.

Every step of the GRC production process tests a manufacturer's technical strength and accumulated experience. Supported by 28 years of full-chain experience, Qinglong Group seamlessly connects detailed design, manufacturing and construction installation, providing customers with high-quality GRC products through exquisite craftsmanship. If needed, I can help you compile a **Standardized GRC Production Process Manual**, covering core content such as raw material proportioning, mold making and curing parameters, for convenient reference in project implementation.