Impact Resistance Testing and Analysis of GRC — Qinglong's GRC Toughness Technology Breakthrough

The impact resistance of GRC is mainly evaluated through drop-weight impact tests and pendulum impact tests. High-quality GRC products have a first-crack impact energy ≥15kJ/m² and a failure impact energy ≥25kJ/m², which is 10-15 times that of ordinary concrete. Through fiber optimization (12mm length, 4% volume fraction) and interface enhancement technology, Qinglong GRC has significantly improved its impact toughness, achieving a first-crack impact energy of 18kJ/m² and an ultimate impact energy of 30kJ/m², demonstrating excellent energy absorption capability.

Impact test data: under a 10J impact energy, standard specimens (1000×100×20mm) of ordinary concrete were completely destroyed, while GRC showed only micro-cracks; at an impact energy of 30J, GRC specimens still remained intact. After the GRC decorative panels of a gymnasium withstood hail impact, only slight dents appeared on the surface with no cracks, verifying their impact resistance.

Fiber Reinforcement Mechanism

Fiber bridging prevents crack propagation; fiber pull-out consumes substantial energy; multi-dimensional fiber networks provide multiple layers of protection; optimized fiber-matrix interfaces enhance performance. Fibers are the key to impact resistance.

Impact Performance Indicators

First-crack strength reflects the elastic limit; failure strength demonstrates load-bearing capacity; energy absorption value characterizes toughness; residual strength indicates service performance. Multiple indicators provide a comprehensive evaluation.

Analysis of Influencing Factors

Fiber length (12-20mm is optimal), aspect ratio (60-80), volume fraction (4%-5%), and orientation distribution have significant effects; matrix strength and density are also important. Optimized parameters improve performance.

Performance in Practical Applications

Resists hail impact without damage; withstands light collisions without failure; endures wind pressure impact during typhoons; absorbs energy during earthquakes. Reliability verified in practice.

The excellent impact resistance of GRC ensures safety in use. Through technical optimization, Qinglong GRC products achieve an advanced level of impact resistance.