What Are the Key Points of High-Strength GRC Panel Production?

In the field of modern architectural decoration, GRC materials have become an ideal choice for high-end buildings such as grand theaters and commercial complexes, thanks to their lightweight, high-strength, and richly formable characteristics. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the decisive role that the production process of high-strength GRC panels plays in product quality. This article provides an in-depth analysis of the core technical points in the production of high-strength GRC panels, offering a professional reference for designers and owners.

The outstanding performance of high-strength GRC panels stems first from scientific material proportions. The synergy between glass fiber and the cement matrix is key. Through 28 years of process refinement, Qinglong has developed optimized formulations for different application scenarios. Alkali-resistant glass fiber is typically used, with its content precisely controlled between 5% and 8%, which ensures a flexural strength above 20MPa while avoiding performance fluctuations caused by uneven fiber distribution. For the cement matrix, high-grade Portland cement is preferred, blended with mineral admixtures such as fly ash and silica fume to enhance strength while reducing hydration heat and minimizing the risk of shrinkage cracking.

Mold technology directly affects the forming precision and surface quality of GRC panels. The digital mold technology introduced by Qinglong enables precise replication of complex shapes, with the minimum radius of curvature controlled within 300mm. For high-strength GRC panels, mold surface treatment is particularly important, requiring imported release agents and mirror polishing processes to ensure that surface smoothness of components meets design requirements. During production, the mold temperature must be maintained at a constant 20-25℃ to prevent component deformation caused by temperature differences.

Spray forming is the core process in the production of high-strength GRC panels, and its process parameters determine the material's compactness and fiber orientation. The high-pressure spray system adopted by Qinglong thoroughly mixes glass fiber with cement slurry at the spray nozzle, spraying it onto the mold surface at a speed of 60-80m/s. The spray angle is controlled between 45° and 60°. Through layered spraying (5-8mm per layer) and directional compaction, the fibers form a three-dimensional random distribution within the matrix, significantly improving the panel's flexural performance. After spraying, vacuum degassing must be performed immediately to keep porosity below 3%.

The curing regime is key to ensuring the strength development of GRC panels. Qinglong has established a two-stage curing system of "steam curing + natural curing": after forming, panels first undergo 24 hours of low-temperature steam curing at 40℃ to accelerate the initial cement hydration reaction; they are then transferred to 28 days of natural curing, with ambient humidity maintained above 90% and temperature controlled at 20-25℃. This curing method enables GRC panels to stably achieve a 28-day compressive strength above 60MPa, with strength continuing to grow in the later stages. It is worth noting that drastic temperature changes must be avoided during curing to prevent thermal stress cracks in components.

Quality inspection is the final checkpoint before high-strength GRC panels leave the factory. In accordance with the Technical Standard for Glass Fiber Reinforced Cement (GRC) Building Applications (JGJ/T423-2018), Qinglong conducts rigorous testing on every batch of products, covering key indicators such as flexural strength, elastic modulus, and water absorption. RFID chip traceability technology has also been introduced to record full-process data from raw materials to production and curing, ensuring product quality traceability. For large-scale projects, 1:1 on-site trial installation is also carried out to verify the dimensional accuracy and connection reliability of components. For more industry information: add WeChat qlfsbl123

As a National High-Tech Enterprise, Qinglong has always regarded process innovation as its core competitiveness, and its high-strength GRC panel production technology has reached an internationally advanced level. The meticulous control of every detail, from material proportions to curing processes, embodies the corporate motto of "rigorous precision and constant pursuit of excellence". Whether for facade cladding panels of landmark buildings or complex garden landscape components, Qinglong can leverage its full-chain service capabilities to provide customers with high-quality GRC solutions, helping to realize the corporate mission of "creating aesthetically beautiful architecture".