How Many Days Is the Minimum Curing Period for GRC Components and Analysis of Key Scientific Curing Points

Scientific maintenance of GRC components provides dual protection for architectural aesthetics and structural safety. With 28 years of industry experience, we can tell you: proper curing not only extends service life, but also keeps architectural art enduring and ever new.

In the field of modern architectural decoration, GRC (glass fiber reinforced concrete), with its advantages of light weight, high strength and rich styling, has become the preferred material for high-end projects such as grand theatres, commercial complexes and landmark buildings. However, many projects suffer from component cracking, surface weathering and other problems after being put into use due to improper curing, which not only affects aesthetics but also poses safety hazards. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on its full-chain service experience to provide an in-depth analysis of the curing cycle and scientific maintenance essentials for GRC components, helping you achieve long-term value in architectural decoration.

GRC Component Curing Period: Why at Least 28 Days?

The curing period of GRC components is not arbitrarily set, but is a scientific conclusion based on material properties and the laws of concrete hydration. According to the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), the standard curing period for GRC components should be no less than 28 days. This is because the cement in GRC materials needs to undergo a complete hydration process—the first 7 days are a period of rapid strength growth, 80% of design strength is reached at 14 days, and the optimal balance between strength and durability is achieved at 28 days. If the curing time is insufficient, the internal structure of the component is not fully stabilized, leading to problems such as drying shrinkage cracks and surface chalking, which directly affect service life. Practice at Qinglong Group's Nanning production base shows that GRC components cured strictly in accordance with the 28-day standard achieve an improvement of more than 30% in impermeability and frost resistance.

Four Essentials of Scientific Maintenance: Full-Cycle Protection from Production to Installation

1. Production Stage: Dual Temperature and Humidity Controlled Curing After GRC components are demolded, they must immediately enter a constant temperature and humidity curing room, maintaining a temperature of 20±2°C and a relative humidity of ≥90%. Qinglong adopts a process combining steam curing and spray curing, with intelligent sensors monitoring environmental parameters in real time to ensure complete cement hydration. At this stage, the focus is on preventing rapid moisture loss from the component surface and avoiding plastic shrinkage cracks.

2. Before Delivery: Natural Curing and Strength Testing At 14 days of curing, components must be transferred to an outdoor natural curing area, away from direct sunlight and strong winds. Qinglong controls light intensity through dedicated curing sheds and sprays water at regular intervals to maintain moisture. Before leaving the factory, flexural strength testing is mandatory (requirement ≥15MPa), and components that fail to meet the standard are strictly prohibited from leaving the factory. This step is key to ensuring engineering quality, as emphasized in the industry standard Qinglong helped formulate: "GRC components that fail curing requirements must not enter construction sites".

3. After Installation: The Critical 7-Day Initial Curing Period The first 7 days after installation is a critical stage for components to adapt to their environment. Daily water spraying is required for weak points such as joints and anchoring points to maintain moisture; in winter, thermal insulation measures are needed (such as covering with insulation cotton), while in summer, high-temperature exposure causing surface cracking must be avoided. Qinglong's construction team develops customized curing plans based on the climate conditions of the project location—for example, extending thermal insulation curing to 10 days in severe cold northern regions.

4. Long-Term Maintenance: Regular Inspection and Professional Servicing GRC components have a life cycle of more than 50 years, so daily maintenance cannot be neglected. A comprehensive inspection once a year is recommended, focusing on surface phenomena such as cracks, weathering and efflorescence. Qinglong's after-sales maintenance services include professional testing and repair solutions—for example, treating fine cracks with special repair mortar and improving impermeability through hydrophobic agent spraying. For landmark building projects, Qinglong can also provide intelligent maintenance services combining BIM models with drone inspections, enabling early detection and early resolution of problems.

As a national high-tech enterprise and a participant in GRC industry standard-setting, Qinglong Group has always upheld the philosophy of "meticulous attention to detail and constant pursuit of excellence", integrating scientific curing throughout its full-chain services from detailed design to after-sales maintenance. Whether it is the GRC curtain wall of a commercial complex in Guangzhou or the special-shaped components of a landmark project in Malaysia, Qinglong ensures through strict curing management that its products remain intact after more than a decade of wind and rain. Choosing Qinglong means not only choosing quality GRC products, but also choosing a long-term commitment to architectural aesthetics and structural safety. Let us join hands to safeguard every architectural detail with professional maintenance and together create an urban landscape that stands the test of time.