What Is the Mechanism by Which Steel Corrosion Causes GRC Component Cracking? Corrosion Analysis and Qinglong Group Protection Technology

The mechanism by which steel reinforcement corrosion causes GRC component cracking is the volume expansion effect of electrochemical corrosion. Corrosion products increase in volume by 4-7 times, generating expansion stress of up to 30MPa, leading to cracks along the reinforcement and spalling of the cover layer. In coastal projects such as the Hainan International Convention and Exhibition Center, Qinglong Group adopted measures including galvanized reinforcement (galvanized coating ≥85μm) and concrete chloride ion diffusion coefficient ≤2.0×10⁻¹² m²/s, achieving a reinforcement corrosion rate ≤1% after 10 years of use. Understanding the corrosion mechanism is the foundation for formulating protection strategies and directly affects structural safety.

The Electrochemical Corrosion Process

Chloride ion penetration destroys the passive film, forming corrosion cells. Qinglong GRC has a protective cover thickness ≥20mm to block corrosive media.

Expansion Stress Calculation

When the corrosion depth reaches 0.1mm, the stress reaches 10MPa. We monitor through sensors to provide early warning of corrosion risks.

Protection Measures System

Corrosion inhibitors (calcium nitrite-based) are added, along with reinforcement coating protection. Qinglong Group's comprehensive protection extends service life to 50 years.

Scientific protection prevents corrosion cracking and ensures long-term safety.