What Are the Main Factors Affecting GRC Strength Degradation? Core Technologies for GRC Strength Assurance Explained

GRC strength degradation directly affects the service life of components and building safety. The degradation process is jointly influenced by multiple factors, including materials, environment, and workmanship. Understanding the core influencing factors and applying scientific control measures can effectively slow down strength degradation—this is also a core technical focus for Qinglong, an industry leader with 28 years of experience, in GRC production and application.

1. Raw Material Quality Is the Fundamental Factor in Strength Degradation

Raw material quality directly determines the strength foundation and durability of GRC, while inferior materials easily lead to rapid degradation. Alkali-resistant glass fibers that fail to meet quality standards, such as those with alkali resistance retention below 75%, are prone to erosion by the cement matrix during long-term use, causing the reinforcement function to fail. The imported alkali-resistant fibers used by Qinglong achieve alkali resistance retention above 85%, reducing degradation risk at the source. Insufficient cement grade or excessive mud content in aggregates lowers matrix density, forms pore channels, and accelerates the penetration of moisture and harmful media. Qinglong strictly controls aggregate mud content at ≤1% and uses high-grade cement of 42.5 or above to ensure matrix strength. In addition, improper admixture selection, such as the use of chlorine-containing admixtures, can trigger internal corrosion and aggravate strength decline. Qinglong firmly prohibits harmful admixtures to ensure material compatibility.

2. The Accelerating Effect of Environmental Factors on GRC Strength Degradation

Harsh environments are the main external causes of GRC strength degradation, and different environmental factors act through different mechanisms. In coastal environments with high salt spray, chloride ions easily penetrate into the material and corrode fibers and steel reinforcement (if present). In the Hainan Poly Bandao No. 1 project, Qinglong effectively resisted salt spray corrosion through a specialized anti-corrosion formula and surface protective treatment. In cold regions, repeated freeze-thaw cycles cause water in internal pores to freeze and expand, producing micro-cracks. Qinglong optimized density so that its GRC withstands more than 300 freeze-thaw cycles, reducing freeze-thaw damage. Acidic media in industrially polluted environments erode the cement matrix and cause strength loss, requiring anti-corrosion admixtures and surface coating protection. Qinglong's GRC products customized for industrial projects can withstand medium-concentration acidic environments.

3. The Critical Impact of Production and Construction Workmanship

Non-standardized production and construction practices can plant hidden risks of strength degradation, or even directly cause early strength decline. Uneven mixing during production causes fiber agglomeration or uneven distribution, resulting in locally weak strength. Qinglong uses fully automated mixing equipment to ensure uniform fiber dispersion. Insufficient curing leads to inadequate cement hydration and incomplete strength development, making later degradation more likely. Qinglong applies constant temperature and humidity curing for more than 28 days to ensure stable strength development. Insecure anchoring during installation keeps components in a prolonged state of stress concentration, accelerating cracking and strength loss. Qinglong uses 3D laser scanning for positioning and installation to ensure precise and reliable anchoring. In addition, insufficient component thickness or unreasonable shape design leads to uneven loading and aggravates local strength degradation.

4. Qinglong's Practical Solutions for GRC Strength Degradation Prevention and Control

Qinglong has established a full life-cycle strength prevention and control system, providing safeguards throughout the entire process from raw materials to after-sales service. At the raw material stage, strict testing is enforced—every batch of fiber, cement, and aggregate must pass strength-related index tests. During production, mix proportion design is optimized, active admixtures are added to improve density, and specialized curing techniques are used to promote strength development. Protective solutions are customized for projects in different environments, such as adding anti-corrosion coatings for coastal projects and strengthening freeze resistance for cold-region projects. The after-sales stage provides regular inspection and maintenance services to promptly detect and address signs of strength degradation. With this system, Qinglong GRC products in projects such as the Shenzhen Pingshan High-tech Zone Comprehensive Service Center have maintained a strength degradation rate within 5% after years of use, far exceeding the industry average.