What to Do About GRC Cracks? Complete Analysis of Causes and Repair Solutions

The beauty of architecture lies in the enduring details. When GRC elements develop cracks, it not only compromises the visual integrity of a building but may also conceal safety hazards. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group will analyze the causes of GRC cracks and repair solutions from a professional perspective, providing designers and owners with a full-chain solution.

Common Causes of Cracks in GRC Materials

As a new type of architectural decorative material, GRC (glass fiber reinforced concrete) crack issues must be analyzed from two dimensions: material properties and construction processes. At the material level, insufficient glass fiber content or an unbalanced cement matrix mix ratio can easily result in inadequate flexural strength of elements (quality GRC should achieve a flexural strength of over 20 MPa); non-standardized curing procedures during production, such as excessively rapid early dehydration or improper temperature and humidity control, can cause shrinkage cracks. During construction, excessive anchor spacing, insufficient thermal deformation compensation, or lack of flexible treatment at joints with materials such as UHPC/GRG can also cause stress-concentration cracking. When participating in the formulation of the Technical Standard for Architectural Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group had already established systematic prevention mechanisms addressing these issues.

Professional Technical Approaches to Crack Repair

Different types of cracks require tiered treatment solutions. Hairline micro-cracks (width <0.1mm) can be surface-sealed with Qinglong's specially formulated penetrating epoxy resin, whose low viscosity allows it to penetrate deep into gaps and form an elastic adhesive film. Structural cracks of 0.1-0.5mm width require first cleaning impurities from the gap, inserting glass fiber reinforcement bars, and then injecting non-shrink repair mortar, ensuring that the post-repair strength is no less than 90% of the original element. For through cracks, Qinglong's proprietary "non-destructive reinforcement technology" uses BIM models to locate stress-weak zones and applies UHPC composite materials for local encapsulation. This technology was successfully applied in the renovation project of Century Plaza on Nanjing East Road, achieving the dual effects of crack repair and structural strengthening.

Building a Full-Chain Prevention System

The core of crack prevention and control lies in source control. Qinglong Group gets involved from the detailed design stage, using parametric design software to optimize the load-bearing models of elements. In the Dongguan Women and Children's Activity Center project, the Grasshopper plugin was used to simulate deformation curves under wind loads, avoiding stress concentration points in advance. The production process employs an automated proportioning system (error ≤±1%) and steam curing technology to ensure stable quality at an annual capacity of 600,000 square meters. The construction stage implements 3D laser scanning for positioning installation, combined with adjustable seismic bearings that allow ±30mm thermal deformation compensation. For after-sales maintenance, a health monitoring database for GRC elements has been established, with regular infrared inspections to predict crack risks, forming a closed-loop management of "design-production-construction-maintenance."

As a national "Specialized, Refined, Distinctive, and Innovative" enterprise and a member of the International GRC Association, Qinglong Group has always upheld its mission of "creating beautiful architecture," transforming 28 years of engineering experience into technical standards and solutions. Whether it is GRC exterior wall cladding panels for commercial complexes or GRG irregular ceilings for museums, we insist on using material science and engineering wisdom to safeguard the safety and beauty of buildings. Choosing Qinglong means choosing not only quality products but also professional assurance throughout the entire project life cycle.