هل GRC متين؟ دراسة تطبيقية على متانة GRC

Durability is a key indicator for evaluating GRC quality and determining its engineering service life. Based on accelerated aging tests and 28 years of engineering tracking data, high-quality GRC is expected to achieve a service life of more than 50 years under normal service conditions. Qinglong GRC reaches an industry-leading level of product durability through systematic material optimization and process control.

In the Hainan International Convention and Exhibition Center project (a marine environment with high temperature, high humidity, and high salinity), Qinglong GRC roof panels have withstood 8 years of real-world environmental exposure. The latest test data show: a carbonation depth of only 0.3mm, a chloride ion diffusion coefficient below 2.0×10⁻¹²m²/s, and a flexural strength retention of 96%. This project has become a "natural laboratory" for testing GRC durability, confirming the material's outstanding performance in extreme environments. By comparison, some GRC products made from ordinary raw materials in the same period have already shown surface powdering and strength degradation under the same conditions. This significant difference highlights the decisive impact of raw material quality and process control on durability.

In-Depth Analysis of Carbonation Resistance

GRC's carbonation resistance depends mainly on matrix density and cement type. Qinglong uses grade 52.5 low-alkali cement (alkali content ≤0.6%) with maximum-density gradation design to significantly reduce the material's carbonation rate. Accelerated carbonation tests (20% CO₂ concentration) show that the 50-year equivalent carbonation depth is less than 1mm, while ordinary mortar can reach 20-30mm. This characteristic ensures that internal reinforcement remains protected from corrosion over the long term.

Freeze-Thaw Resistance Verification

After 300 rapid freeze-thaw cycles, the mass loss rate is <0.5% and the relative dynamic elastic modulus is >90%, far exceeding national standards (mass loss ≤5%, dynamic elastic modulus ≥60%). In projects in northern regions, this performance ensures components remain intact through harsh winters. Freeze-thaw resistance is especially critical in zones with fluctuating water levels.

Heat and Humidity Aging Resistance

In an accelerated aging environment with a temperature of 40℃ and relative humidity of 95%, after 1,000 hours of testing, the surface showed no cracking or powdering. This performance makes GRC particularly suitable for use in rainy southern regions. In a landmark building in Guangzhou, GRC components have maintained stable performance through 10 years of hot, humid climate.

Long-Term Performance Tracking Data

Tracking of GRC projects in service for more than 15 years shows that material performance remains stable. In a 12-year-old commercial complex in Shenzhen, GRC decorative components showed a tested strength retention of 98%, with a surface color change of ΔE≤3.2. These long-term data provide strong proof of GRC's durability.

GRC's durability advantages have been verified through both rigorous testing and engineering practice. Selecting high-quality GRC products and installing them correctly ensures the long-term safe use of the works.