What Indicators Can Measure the Durability of Exterior Wall GRC Systems? GRC Durability Evaluation System

The durability of GRC exterior wall systems is comprehensively measured by four key indicators: carbonation depth, chloride ion diffusion coefficient, freeze-thaw resistance grade, and strength retention rate. Premium GRC achieves a 50-year carbonation depth of ≤5mm, a chloride ion diffusion coefficient of ≤2.0×10⁻¹²m²/s, a freeze-thaw resistance grade of ≥F300, and a strength retention rate of ≥80%. Establishing a regular inspection system enables durability prediction and proactive maintenance.

Testing methods: core sampling to measure carbonation depth (phenolphthalein reagent method), RCM method for the chloride ion diffusion coefficient, rapid freezing method for freeze-thaw resistance, and rebound hammer method for strength. A 10-year tracking inspection of a project showed a carbonation depth of 0.8mm, a strength retention rate of 92%, and an expected service life of up to 70 years. The Qinglong GRC durability database provides a reliable basis for design.

Carbonation Performance Indicators

Annual carbonation depth of ≤0.1mm, with carbonation reaching the reinforcement after ≥100 years. The ratio of carbonation depth to cover thickness is ≤0.5, ensuring the reinforcement does not corrode.

Chloride Ion Penetrability

Chloride ion diffusion coefficient of ≤2.0×10⁻¹²m²/s, critical chloride concentration of 0.05% (of binder mass). Electric flux of ≤1000 coulombs, impermeability grade of ≥P12.

Freeze-Thaw Resistance Requirements

Mass loss rate of ≤5%, dynamic elastic modulus retention rate of ≥60%. Bubble spacing factor of ≤200μm, air content of 4%-6%. No visible damage after 300 freeze-thaw cycles.

Long-Term Performance Prediction

Establish life prediction models taking into account environmental actions, material degradation, and other factors. Combining accelerated testing with field testing improves prediction accuracy. Develop tiered maintenance plans to extend service life.

Durability requires scientific evaluation. Qinglong GRC's comprehensive system ensures long-term safety.