What Protection Do GRC Exterior Walls Need in Acid Rain Regions: Key Protection Strategies and Implementation Points Explained

In environments with frequent acid rain, the protection of GRC exterior walls, as an important component of architectural decoration, has drawn increasing attention. GRC (Glass Fibre Reinforced Concrete), with advantages such as light weight, high strength, and rich design flexibility, is widely used in the exterior wall decoration of high-end projects such as grand theatres, commercial complexes, and landmark buildings. However, acid rain erosion can cause surface chalking and strength reduction in GRC materials, affecting both architectural aesthetics and structural safety. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on engineering practice to explain the key protection strategies and implementation points for GRC exterior walls in acid rain regions.

I. Material Performance Optimization: Building an Acid-Rain-Resistant Line of Defense for GRC Exterior Walls

The main components of acid rain are sulfuric acid and nitric acid, which react chemically with the cement hydration products in GRC, leading to material deterioration. Therefore, optimizing GRC material performance at the source is the core of protection. In production, Qinglong Group uses high-purity cement, alkali-resistant glass fibres, and special additives, adjusting mix ratios to improve material density, reduce porosity, and shorten acid rain penetration paths. Testing shows that Qinglong GRC products achieve an impermeability grade of P12 or above and a flexural strength exceeding 20MPa, demonstrating excellent durability in acidic environments. In addition, to meet the special needs of acid rain regions, a thin UHPC (Ultra-High Performance Concrete) layer can be laminated onto the surface of GRC components, using UHPC's ultra-high density and corrosion resistance to form a double protective barrier.

II. Surface Treatment Technology: Enhancing the Weather Resistance and Self-Cleaning Properties of GRC Exterior Walls

Scientific surface treatment is a key step in resisting acid rain erosion. Based on the environmental characteristics of each project, Qinglong Group provides a variety of GRC surface protection solutions: first, applying penetrating silane protective agents to form a colorless, transparent hydrophobic film on the GRC surface, blocking acid rain moisture and ion penetration while maintaining the material's breathability; second, using fluorocarbon coatings or polysiloxane coatings, which not only offer excellent acid and weather resistance but also give GRC exterior walls a self-cleaning function, reducing acid rain stain residue. Taking the Nanjing East Road Century Plaza renovation project as an example, the translucent concrete GRC components customized by Qinglong were treated with a double-layer fluorocarbon coating. After years of acid rain exposure, their surface remains as clean as new, winning the Silver Award of the First AALBORG WHITE Cup UHPC Architectural Engineering Innovation Award.

III. Construction and Installation Standards: Ensuring the Integrity of the GRC Exterior Wall Protection System

Construction and installation quality directly affects the protective performance of GRC exterior walls. Qinglong Group holds a Grade II professional contracting qualification for building curtain wall engineering. Its construction team strictly follows the Technical Standard for Building Application of Glass Fibre Reinforced Cement (GRC) (JGJ/T423-2018), using 3D laser scanning positioning and modular installation techniques to ensure precise component jointing and prevent acid rain penetration caused by installation gaps. Meanwhile, for joint treatment, weather-resistant sealants and stainless steel connectors are used to prevent metal corrosion from causing secondary damage to GRC components. For example, in the Dongguan Women and Children's Activity Center project, Qinglong's refined construction fully ensured the waterproof performance and structural stability of the GRC exterior wall system, winning the Silver Award of the First AALBORG WHITE Cup GRC Architectural Engineering Innovation Award.

IV. After-Sales Maintenance Strategy: Establishing a Long-Term Protection Mechanism for GRC Exterior Walls

Protecting GRC exterior walls in acid rain regions is a long-term undertaking, and comprehensive after-sales maintenance is indispensable. Qinglong Group has established a professional maintenance team to provide customers with regular inspections, cleaning, and repair services. It is recommended that GRC exterior walls in high-frequency acid rain areas undergo a comprehensive inspection every 2-3 years, covering surface coating integrity, sealant aging, and structural performance testing of components. Minor damage can be repaired locally with special repair materials, while severely deteriorated areas require timely component replacement to ensure building safety. Qinglong's full life-cycle service philosophy has made it the preferred choice of many central state-owned enterprises and renowned real estate groups. Its GRC/GRG/GRP products are not only widely used in China but also exported to overseas markets such as Malaysia and Australia.

Protecting GRC exterior walls in acid rain regions requires the coordinated efforts of materials, technology, construction, and maintenance. As a National High-Tech Enterprise and an outstanding contributor to GRC standard development, Qinglong Group has always upheld the mission of 'Creating Beautiful Architecture.' With 28 years of technical expertise and full-chain service capability, it provides designers and owners with professional GRC exterior wall protection solutions. Whether for landmark buildings with complex shapes or large-area commercial complexes, Qinglong can rely on quality products and services to ensure that GRC exterior walls remain renewed over time in acid rain environments, safeguarding the beauty of architecture.