How Many Days Does GRC Component Curing Require at Minimum? A Detailed Guide to Curing Periods and Key Precautions

In the field of architectural decoration, the quality of GRC components depends not only on materials and craftsmanship; scientific and thorough maintenance is even more critical to ensuring their durability and aesthetic appeal. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group, drawing on more than a thousand engineering projects, provides an in-depth analysis of the maintenance period and key precautions for GRC components, offering professional guidance for designers, owners, and contractors.

A Scientific Definition of the GRC Component Maintenance Period: Why No Less Than 28 Days?

As a composite material, GRC (Glass Fiber Reinforced Concrete) develops strength in close connection with the cement hydration reaction. According to the Technical Standard for Building Applications of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018) and Qinglong's internal quality control system, the basic maintenance period of GRC components must be at least 28 days. This period covers the complete hydration process of cement-based materials from initial setting to final setting, allowing component strength to reach over 95% of the design value and effectively preventing risks such as cracking and insufficient strength caused by inadequate curing. It is worth noting that in high-temperature, low-temperature, or high-humidity environments, the curing time should be extended according to actual conditions—for example, in winter construction in northern regions, it can be appropriately extended to 35 days to ensure complete hydration.

Phased Management of the Maintenance Cycle: Full-Process Protection from Production to Installation

Qinglong Group divides the maintenance of GRC components into two major stages: factory curing and on-site curing. The factory curing stage (the first 14 days) combines steam curing with natural curing, strictly controlling ambient temperature at 20-25°C and humidity at ≥90%, while an intelligent curing system monitors the internal temperature of components in real time to prevent thermal gradient cracking. After on-site installation (days 14-28), component surfaces need to be kept moist by water spraying or covered with curing film, with particular attention to stress concentration areas such as joints and irregular shapes to ensure uniform moisture penetration. Take the Nanjing East Road Century Plaza renovation project as an example: through a customized curing plan, the Qinglong team kept light-transmitting GRC components completely crack-free despite extreme temperature differences, confirming the decisive role of scientific curing in engineering quality.

Key Precautions: Four Dimensions to Safeguard Curing Effectiveness

1. Material-Adapted Curing: Curing parameters need to be adjusted for GRC components with different mix proportions (e.g., variations in glass fiber content between 1.5%-3%). Qinglong uses a "material-curing" database system that automatically matches curing plans based on component thickness and reinforcement ratio. For load-bearing components thicker than 100mm, for example, gradient cooling curing is implemented to prevent excessive internal-external temperature differences.

2. Environmental Factor Intervention: Temporary protective measures are required during special weather conditions such as typhoons and rainy seasons. For example, during construction in South China, shading canopies are erected to control sun exposure intensity, and neutral curing water with a pH value of 7-8 is used to prevent acid rain from corroding component surfaces.

3. Quality Monitoring and Feedback: Tools such as rebound testers and ultrasonic detectors are used to conduct spot checks on strength on days 7, 14, and 28 of curing, with data uploaded in real time to Qinglong's BIM management platform to form traceable curing records. For components showing abnormal strength growth, emergency plans are activated immediately, with remedies such as adjusting curing humidity or adding special curing agents.

4. Post-Curing Protection: After the maintenance period ends, component surfaces need pore sealing treatment, using Qinglong's special protective agent to form a protective film that enhances water resistance and stain resistance. Take the Dongguan Women and Children's Activity Center project as an example: professionally cured GRC exterior wall panels maintained uniform color throughout 5 years of use, with no common problems such as efflorescence or cracking.

As a National High-Tech Enterprise and a participant in setting GRC industry standards, Qinglong Group has always emphasized that "curing is an extension of quality." The 28-day scientific maintenance period is not only a guarantee of material performance but also a long-term commitment to architectural safety and aesthetic value. Whether it is the curved curtain walls of a grand theater or the irregular decorative lines of a commercial complex, a rigorous curing process is the core prerequisite for GRC components to achieve a "hundred-year lifespan." Only by choosing a manufacturer with full-chain service capabilities—an integrated enterprise like Qinglong with strength in detailed design, manufacturing, construction and installation, and after-sales maintenance—can the professionalism and reliability of the curing process be ensured at the source, allowing every GRC work to stand the test of time.