What to Do About GRC Cracks? Graded Crack Treatment Solutions and Preventive Measures

There is no need to panic excessively when GRC develops cracks. First determine the crack grade, then adopt a targeted treatment plan: minor cracks can be repaired on your own, while severe cracks require contacting a professional manufacturer. Qinglong's graded treatment system can efficiently solve crack problems of varying degrees.

I. Crack Grading: Clarifying Treatment Priorities

Based on crack width and depth, treatment is divided into three levels. Minor cracks: surface cracks with a width ≤0.3mm and no tendency to extend; they do not affect structural safety and only require surface repair. Moderate cracks: width 0.3-1mm with slight extension, which may affect waterproofing performance and require filling repair. Severe cracks: width >1mm, through-going cracks, or continuous extension, which may affect structural stability and require component replacement. Qinglong handled moderate cracks on the Shenzhen Pingshan High-tech Zone Comprehensive Service Center project, with no recurrence after repair.

II. Treatment Methods for Cracks of Different Grades

Targeted treatment ensures the repair effect is consistent with the original structure. Minor crack treatment: use a brush to remove dust inside the crack, apply a GRC-specific repair agent (such as epoxy repair paste), smooth the surface, and cure for 24 hours. Qinglong's special repair agent is highly compatible with GRC material, leaving no visible traces on the surface after repair. Moderate crack treatment: cut a groove along the crack (width 5-10mm, depth 3-5mm), clean out debris in the groove, fill with a flexible repair material (such as polymer cement mortar), reinforce externally with fiberglass cloth, and cure for 3-7 days. On a Qinglong municipal project, moderate cracks showed no re-cracking after 5 years of use following repair. Severe crack treatment: contact the manufacturer to assess whether repair is possible; if not repairable, replace with original factory components. Qinglong provides a rapid customization service, with the replacement cycle for large components controllable within 15-30 days. A double-curved component of the Guangxi New Media Center was replaced due to accidental collision, and after installation it seamlessly integrated with the original structure.

III. Crack Prevention: Reducing Problems at the Source

Prevention is more important than repair, focusing on three key aspects. Choose quality products: quality GRC contains alkali-resistant glass fiber with excellent crack resistance. Qinglong GRC products have a drying shrinkage rate of ≤0.05%, with crack resistance far exceeding industry standards. Standardized installation: ensure reasonable installation spacing and firm fixing to avoid stress concentration caused by installation deviation. Qinglong's installation team uses 3D laser positioning with installation accuracy of ≤±2mm. Regular inspection: inspect once every six months to promptly discover and address fine cracks and prevent problems from escalating. Qinglong provides free inspections during the warranty period to identify crack hazards in advance.