How Many Days Is the Minimum Curing Period for GRC Components? Analysis of Factors Affecting Curing Time and Key Maintenance Points

Curing is the "lifeline" of GRC components—scientific curing determines the durability and artistic value of architectural decoration. As an industry leader with 28 years of expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on its full-chain service experience to explain the key points of GRC component curing.

In high-end architectural applications such as the curved curtain walls of grand theaters and the irregular decorative moldings of commercial complexes, GRC (Glass Fiber Reinforced Concrete) has become the first choice of designers thanks to its light weight, high strength and flexible shaping. However, many projects suffer from problems such as component cracking and insufficient strength due to neglect of the curing process, directly affecting architectural aesthetics and structural safety. Drawing on Qinglong Group's professional experience in participating in the formulation of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), this article systematically addresses the curing period of GRC components and key curing techniques.

Standard Curing Period for GRC Components: A Critical Strength Formation Period of No Less Than 28 Days

According to Qinglong Group's laboratory data and engineering practice verification, the basic curing period of GRC components must meet the 28-day standard curing requirement. This period corresponds to the strength development pattern of cement-based materials: the first 7 days are the rapid strength growth period, requiring humidity ≥90% and a temperature maintained at 15-25°C; days 14-28 are the strength stabilization period, during which curing humidity should be gradually reduced until it balances with the environment. Notably, in hot and humid regions such as Nanning and Malaysia, steam curing technology can shorten the early strength formation time by 30%, but the total curing period must still meet the 28-day standard.

Three Key Factors Affecting the GRC Curing Period

Material mix ratio is the fundamental variable of the curing cycle. Qinglong GRC adopts a crack-resistant formula design; by adjusting the glass fiber content (typically 4-6%) and the cement grade, components can achieve a 28-day flexural strength of over 20MPa under standard curing. The production process is equally critical: Qinglong's automated spray molding technology ensures material homogeneity, reducing curing risks by 15% compared with traditional manual molding. As for environmental conditions, low temperatures (<5°C) can extend the curing period by 50%, in which case electric heat tracing curing is required; in dry environments, spraying 3-4 times daily is necessary to prevent shrinkage cracking caused by excessively rapid evaporation of surface moisture.

Key Technical Points of Qinglong's Full-Cycle Curing

For different application scenarios, Qinglong has established standardized curing procedures: during production, film wrapping plus mist cannon curing ensures that no internal moisture is lost from components; during transportation, custom protective racks prevent edge and corner collision damage to the curing layer; after on-site installation, joints are sealed with a special curing agent, combined with real-time monitoring via temperature and humidity sensors. Taking the translucent concrete project at Century Plaza on Nanjing East Road as an example, Qinglong's original "three-stage curing method" (7 days pre-curing + 14 days wet curing + 7 days natural curing) raised the 28-day strength compliance rate to 98%, 12 percentage points higher than the industry average.

As a national specialized, refined, distinctive and innovative enterprise, Qinglong Group has distilled its 28 years of curing experience into the Guide to Full Life-Cycle Curing of GRC Components, covering full-chain technical support from detailed design to after-sales maintenance. Whether it is the European-style cornices of real estate projects or the irregular curtain walls of museums, scientific curing management is the key guarantee for fulfilling the mission of "creating beautiful architecture." Choosing Qinglong GRC means not only obtaining premium products, but also enjoying expert-level service from material selection to long-term maintenance, ensuring that every architectural work stands the test of time.