How Many Days Is the Minimum Curing Period for GRC Components? Detailed Explanation of Curing Points and Time Specifications

The maintenance of GRC components is the invisible cornerstone that determines the quality and lifespan of architectural decoration—only scientific curing can keep every detail enduringly beautiful.

In the field of architectural decoration, GRC (Glass Fiber Reinforced Concrete), with its lightweight, high-strength, and flexible shaping properties, has become an ideal choice for high-end projects such as grand theaters, commercial complexes, and landmark buildings. However, while many project owners focus on the design and installation of GRC components, they tend to overlook later-stage maintenance—a critical step. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the decisive role of scientific curing in the durability of GRC components. This article provides professional guidance for designers and owners from three aspects: curing period, key points, and standard specifications.

GRC Component Curing Period: Why at Least 28 Days?

According to the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018) and verified by Qinglong Group's more than 20 years of engineering practice, the basic curing period of GRC components should be no less than 28 days. This period stems from the hydration characteristics of cement-based materials: the first 7 days are a period of rapid strength growth, requiring sufficient moisture to promote the reaction of cementitious materials; days 14-28 are a strength stabilization period, during which the internal structure of components gradually becomes denser, with significantly improved crack resistance and durability. Insufficient curing time can easily lead to problems such as surface cracking and inadequate strength, directly affecting project lifespan—a commercial complex once shortened its curing period to 15 days, resulting in fine cracks appearing on facade components six months later and a 30% increase in later repair costs.

Staged Curing Key Points: Full-Process Protection from Production to Installation

1. Production Stage Curing (Days 1-7): Laying the Foundation for Strength
At Qinglong Group's Guangxi production base, GRC components must enter temperature- and humidity-controlled curing chambers immediately after demolding. Using a combination of steam curing and spray curing, the ambient temperature is maintained at 20-25°C and relative humidity at ≥90% to avoid early dehydration cracking. During this stage, temperature and humidity data must be recorded every 2 hours to ensure the curing curve complies with Qinglong's enterprise standard—which improves humidity control precision by 15% over industry average requirements and effectively reduces the shrinkage rate of components.

2. Post-Installation Curing (Days 8-28): Adapting to Site Conditions
After on-site installation is completed, GRC components require “secondary curing.” Differentiated measures should be taken according to different climate conditions: in high-temperature regions, spray 3 times daily, keeping the surface moist for 30 minutes each time; in cold regions, cover with thermal insulation blankets and prohibit freezing; in rainy regions, ensure proper drainage to prevent components from being soaked for extended periods. Qinglong project teams are equipped with dedicated curing logs to record daily curing conditions in detail, ensuring compliance with the stringent later-stage curing requirements of the General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC).

3. Special Scenario Curing: Meeting Extreme Environment Challenges
For GRC components in coastal high-salt-mist areas or cold regions, Qinglong recommends extending curing to 42 days and applying silane impregnation treatment in the later curing stage to enhance impermeability and frost resistance. For example, in a coastal project in Malaysia, this process raised the salt spray resistance of GRC components to over 5,000 hours, far exceeding conventional industry standards.

Long-Term Value of Scientific Curing: From Cost Control to Brand Assurance

Standardized GRC curing not only extends component lifespan (Qinglong project data shows that scientific curing can extend the service life of GRC components to more than 50 years) but also reduces full life-cycle costs. Take a landmark project as an example: through 28 days of standard curing, maintenance costs over the following 10 years were reduced by 65% compared with projects without standardized curing. As a National High-Tech Enterprise and a participant in GRC industry standard setting, Qinglong Group has always incorporated the curing process into its full-chain quality management system, considering curing feasibility as early as the detailed design stage, and providing customers with integrated “design-production-installation-curing” solutions.

[Summary] The 28-day curing period for GRC components is a scientific crystallization of material properties and engineering practice. Neglect curing, and even the finest designs and materials cannot deliver their due value. Drawing on 28 years of professional experience, Qinglong Group reminds you: when choosing a GRC supplier, focus not only on product quality but also on its curing technology and service capabilities—only by implementing scientific curing throughout can architectural beauty withstand the test of time.