Analysis of Causes and Solutions for Honeycomb and Pitted Surfaces on GRC Components After Installation

In the field of architectural decoration, GRC components have become the visual centerpiece of numerous landmark buildings thanks to their lightweight, high-strength properties and rich variety of forms. However, honeycomb and pitted surface issues appearing after installation not only affect the building's aesthetics but may also plant hidden structural safety hazards. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide an in-depth analysis of the causes and systematic solutions to this industry pain point from a full-process perspective covering detailed design, manufacturing, and construction installation.

Analysis of the Three Core Causes of Honeycomb and Pitted Surfaces on GRC Components

The formation of honeycomb and pitted surfaces is often the result of problems accumulating across multiple stages. At the material proportioning stage, an imbalanced ratio of cement to glass fiber, or unreasonable sand aggregate gradation, can easily lead to poor concrete flowability and air bubbles that are difficult to expel. Laboratory data from Qinglong Group show that when the glass fiber content exceeds 6% and is unevenly dispersed, the probability of pitted surfaces appearing on component surfaces increases by 40%. During production, inadequate mold surface treatment, uneven application of release agent, or improperly set vibration process parameters all directly affect concrete compactness. In a provincial capital cultural center project, large-area honeycombing appeared on component surfaces because the vibration frequency was below 30Hz; the issue was later resolved after Qinglong's technical team re-optimized the vibration plan.

Full-Chain Control: Eliminating GRC Quality Defects at the Source

As a national high-tech enterprise integrating detailed design, manufacturing, and construction installation, Qinglong has established a three-level quality control system covering “materials-production-installation.” On the material side, imported alkali-resistant glass fiber is compounded with special cement, and a patented proportioning technology (Patent No. ZL2021XXXXXXXXX) ensures a balance between concrete flowability and strength; in the production stage, BIM technology is introduced for mold precision control, combined with an automated vibration platform to achieve 360° compactness with no dead zones; during installation, 3D laser scanning positioning is applied, keeping errors within ±2mm. This full-process control model keeps the first-pass qualification rate of Qinglong GRC components consistently above 98%.

Targeted Solutions: Closed-Loop Management from Repair to Prevention

For honeycomb and pitted surface problems that have already appeared, Qinglong has pioneered a “layered repair process”: shallow defects are filled with a dedicated repair mortar (compressive strength ≥40MPa), while deep honeycombing requires implanting glass fiber mesh sheets before repair, ensuring that the strength of the repaired area is no lower than that of the original component. Even more important is the establishment of a prevention mechanism—through a digital production management system, 12 key parameters for each batch of components, including material proportioning, vibration time, and curing temperature and humidity, are monitored in real time, and 58 patented technologies are combined to form a quality traceability system. In a commercial complex project in Guangzhou, this system successfully kept the surface defect rate of GRC components below 0.5%, far below the industry average.

As a vice-chairman unit of the China GRC Association, Qinglong Group has always taken “creating beautiful architecture” as its mission, transforming 28 years of engineering experience into standardized solutions. From participating in the formulation of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018) to undertaking more than a thousand key projects at home and abroad, Qinglong has proven with professional strength that quality control of GRC components is not merely a technical issue, but a systematic project. Choosing Qinglong, a GRC manufacturer with full-chain service capability, means avoiding risks at the design stage and ensuring that every architectural detail stands the test of time.