How Many Days Is the Minimum Curing Period for GRC Components: Analysis and Key Measures to Extend Curing

In the field of architectural decoration, GRC components, with their lightweight, high-strength properties and rich styling, are widely used in exterior wall cladding panels, decorative moldings, and landscape garden components of high-end projects such as grand theaters, commercial complexes, and landmark buildings. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the importance of component curing to project quality. This article will analyze the curing period standards for GRC components from a professional perspective and share key technical measures for extending the curing period, providing an authoritative reference for designers, owners, and contractors.

The Core Standard for GRC Component Curing Periods: Why Is "28 Days" the Industry Baseline?

According to the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), the curing period of GRC components should not be less than 28 days. This period is the foundation for ensuring full hydration of cement-based materials, adequate strength, and stable performance. Qinglong Group has found in production practice that during the 28-day curing period, the compressive strength of components can increase to over 95% of the design value, and the interfacial bond between the glass fiber and the cement matrix reaches its optimal state. For projects in high-temperature, high-humidity, or severely cold regions, it is recommended to appropriately extend the curing time according to environmental conditions. For example, during winter construction in northern regions, the total curing period can be extended to 35 days by combining steam curing with natural curing, thereby avoiding damage to the internal structure of components caused by freeze-thaw cycles. For more industry information: +WeChat qlfsbl123

Three Major Curing Misconceptions That Affect GRC Component Durability

In actual projects, improper curing is the main cause of GRC component cracking and insufficient strength. Common misconceptions include: first, premature mold removal—some contractors, in order to meet deadlines, remove molds within 7 days after casting, when material hydration has not yet been completed, easily causing surface cracks; second, insufficient curing humidity—especially in hot summer environments, if spraying or covering measures are not taken, surface moisture evaporates too quickly, forming drying shrinkage cracks; third, neglecting later-stage maintenance—some projects assume that everything is done once the curing period ends, failing to regularly check for issues such as sealant aging and loose anchor points. As a national high-tech enterprise, Qinglong Group has built a full life-cycle curing and maintenance system through 58 patented technologies, with strict standards from production to after-sales service.

Four Key Measures to Extend the Service Life of GRC Components

1. Precisely control the curing environment: At Qinglong's Guangxi production base, intelligent curing kilns are used to achieve constant control of temperature (20±2℃) and humidity (≥90%), with steam curing in the first 7 days to accelerate hydration and natural curing in the following 21 days to ensure stable performance. For components installed on site, it is recommended to use film covering plus a spraying system to keep surfaces moist for no less than 14 days.

2. Optimize material mix design: By adjusting the glass fiber content (typically 4-5%) and selecting high-grade cement and mineral admixtures, the crack resistance and durability of components are improved. Qinglong's UHPC-GRC composite components achieve flexural strength of over 25MPa, with a service life 30% longer than traditional GRC.

3. Strengthen surface protection treatment: A specialized silane impregnating agent is used for surface sealing to form a waterproof layer that resists ultraviolet and acid rain erosion. For projects in coastal areas, an anti-salt-spray coating should also be added. A coastal project in Malaysia undertaken by Qinglong adopted this technology, and its components have shown no obvious aging after 5 years of sea wind erosion.

4. Establish a regular maintenance mechanism: It is recommended to conduct a comprehensive inspection of GRC components once a year, focusing on sealant strip aging, anchor bolt corrosion, and the condition of component joints. Qinglong's after-sales maintenance service includes a professional inspection team that uses 3D scanning technology to assess component deformation, ensuring long-term safe use. For more industry information: +WeChat qlfsbl123

As a participant in the formulation of GRC industry standards, Qinglong Group has always been committed to the mission of "creating beautiful architecture," integrating 28 years of full-chain experience into product design and services. Whether it is shaped curtain walls of landmark buildings or artistic components for landscape gardens, scientific curing management is the key to ensuring GRC materials perform at their best. Only by choosing a supplier with integrated capabilities in detailed design, manufacturing, construction and installation, and after-sales maintenance—such as Qinglong, a national 'Specialized, Refined, Distinctive, and Innovative' enterprise—can project quality be guaranteed from the source, achieving the perfect unity of architectural aesthetics and structural safety.