What Protective Measures Should Be Strengthened for GRC Curtain Walls in Coastal Areas: Analysis of Key Protection Points and Implementation Strategies

**The Protection Code for GRC Curtain Walls in Coastal Areas: All-Round Safeguards from Materials to Craftsmanship**

In the harsh environment where sea breeze and salt intertwine, GRC curtain walls are not only a carrier of architectural aesthetics but also the first line of defense against natural erosion. As an industry player with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the extreme requirements coastal projects place on material performance and construction techniques. Drawing on engineering practice, this article systematically analyzes the six key protection points for coastal GRC curtain walls, providing designers and owners with solutions that combine safety and durability.

**I. Material Selection: Building the First Barrier Against Corrosion**

The high humidity and chloride ion erosion of coastal environments place special demands on the formulation design of GRC materials. In production, Qinglong uses an alkali-resistant glass fiber (AR glass fiber) and low-alkalinity cement composite system, raising the material's flexural strength to over 20MPa, while optimizing density through the incorporation of silica fume and mineral powder to keep the chloride ion penetration coefficient below 1.0×10⁻¹²m/s. Compared with conventional GRC products, Qinglong's customized coastal-specific formulation demonstrates superior crack resistance and carbonation resistance in accelerated aging tests, laying the foundation for long-term curtain wall stability.

**II. Structural Design: Dual Considerations of Mechanics and Waterproofing**

Curtain wall structures must withstand both wind pressure loads and rainwater penetration. Qinglong's technical team innovatively adopted a "double sealing + pressure-equalized cavity" design: the primary seal uses weather-resistant silicone sealant, while the secondary seal is fitted with EPDM waterproof gaskets. Combined with optimized drainage slopes, water tightness reaches Grade 5 of the GB/T 21086-2007 standard. For the anchoring system, 316 stainless steel connectors are selected, offering 3 times the salt spray resistance of conventional 304 stainless steel, ensuring no corrosion failure over 25 years in marine climates.

**III. Surface Treatment: Building Long-Lasting Protective Coatings**

Addressing the strong UV radiation and high salt mist concentration of coastal areas, Qinglong developed a three-layer surface protection system: the base layer uses penetrating inorganic silane treatment to form an anti-corrosion layer 5-8mm deep; the middle layer is sprayed with fluorocarbon primer with adhesion reaching over 10MPa; the top layer uses PVDF fluorocarbon paint with gloss controlled at 30-50 degrees, ensuring both weather resistance (artificial aging resistance ≥3000 hours) and a naturally warm, smooth finish. This process withstood a Force 12 typhoon at a seaside hotel project in Zhuhai, showing no obvious discoloration or chalking after 5 years.

**IV. Construction Techniques: Precise Control Ensures Quality**

The precision of on-site installation directly affects protection performance. Qinglong uses BIM technology for pre-assembly simulation, keeping installation errors within ±2mm; three-dimensional laser scanning positioning ensures the verticality and flatness of keel installation. For joint treatment, the innovative "stepped staggered joints + elastic rubber strips" process absorbs thermal deformation while preventing rainwater backflow. At a cultural tourism project in Xiamen, this process achieved curtain wall air tightness of 1.5m³/(m²·h)@10Pa, far exceeding national standard requirements.

**V. Drainage System: Dynamic Channeling to Prevent Water Accumulation**

Heavy rainfall in coastal areas requires drainage systems with rapid response capability. Qinglong's concealed drainage channel uses a 0.5% slope, with drainage holes spaced 1.5m apart, achieving a drainage capacity of 10L/(m·min). In node construction, a "high inside, low outside" drip line design is adopted, combined with water guide plates to direct condensate orderly to the drainage system, effectively preventing water stain pollution and freeze-thaw damage to components.

**VI. Maintenance System: Full Life-Cycle Management**

Long-lasting protection depends on scientific maintenance plans. Qinglong has established a "three inspections and three maintenance" mechanism: quarterly checks of sealant aging, annual structural safety testing, and comprehensive performance evaluations every three years. For coastal projects, specialized maintenance packages are provided, including customized services such as surface coating repair and connector anti-corrosion treatment. Through a digital management platform, curtain wall displacement and stress changes can be monitored in real time, enabling preventive maintenance.

From material innovation to system integration, Qinglong has built an all-dimensional protection system for coastal GRC curtain walls with 28 years of professional experience. As a national high-tech enterprise and participant in GRC industry standard development, we always adhere to the values of "honesty, hard work, trust, and collaboration," providing designers with one-stop services from detailed design to after-sales maintenance. In benchmark projects such as the Haikou International Convention and Exhibition Center and the Qingdao Marine Science and Technology Museum, Qinglong GRC curtain walls have not only achieved precise expression of architectural aesthetics but also proven their technical strength through outstanding durability. In the future, Qinglong will continue to focus on the innovative application of UHPC/GRC/GRG/GRP materials, creating "urban armor" for coastal buildings that combines safety and beauty.