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 nature and rich variety of shapes. However, honeycomb and pitted surface problems that appear after installation not only affect the building's aesthetics but may also pose hidden structural safety risks. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group takes a whole-process perspective—from detailed design and manufacturing to installation—to deeply analyze the root causes of this common quality defect and its systematic solutions.

Tracing the Causes of Honeycomb and Pitted Surfaces on GRC Components: A Full-Chain Inspection from Materials to Processes

The formation of honeycomb and pitted surfaces is by no means the fault of a single step; it is the result of the interplay between material properties and construction techniques. At the material preparation stage, an imbalanced ratio of glass fiber to cement matrix or insufficient fluidity of the mix makes it difficult for air bubbles to escape during pouring; in production, improper mold surface treatment and insufficient vibration can easily cause pores to form on component surfaces; and during installation, uneven substrate preparation or inadequate joint sealing can likewise lead to later surface defects. Through reviews of more than a thousand GRC projects, Qinglong Group has found that over 60% of honeycomb and pitting problems can be traced to detail oversights in the early detailed design stage.

Quality Control at the Source: Qinglong's GRC Component Quality Control System

As a National High-Tech Enterprise, Qinglong Group has established a three-tier quality control system covering "material R&D—manufacturing—installation." On the materials side, self-developed low-alkali cement and alkali-resistant glass fiber are used to ensure the mix offers excellent workability and interfacial bond strength; in production, BIM technology is introduced for mold precision control, combined with high-frequency vibrating tables and vacuum degassing processes to raise component density by more than 30%; before construction, the substrate is pre-treated using 3D laser scanning to keep installation surface deviations within ±2mm. This system has been successfully applied to benchmark projects such as the Nanjing East Road Century Plaza renovation project, achieving a 99.8% pass rate for GRC component surface flatness.

Systematic Solutions: From Repair Techniques to Prevention Mechanisms

For honeycomb and pitted surfaces that have already appeared, Qinglong Group offers a tiered repair solution: minor defects under 5mm in diameter are filled and ground with specialized repair mortar; for larger pitted areas, a three-step method of "interface treatment—layered repair—texture restoration" is applied to ensure the repaired surface matches the original component in color and texture. More importantly, a prevention mechanism has been established: a digital production management system records the production parameters of every batch of GRC components for quality traceability, and drawing on 28 years of accumulated construction experience, the "GRC Installation Quality Pre-Control Manual" has been compiled to fundamentally reduce the defect occurrence rate.

Industry Value: Driving GRC Quality Upgrades Through Technological Innovation

As a contributing editor of the Technical Standard for Glass Fiber Reinforced Cement (GRC) Architectural Applications, Qinglong Group has always been committed to advancing industry technology. By combining the high-performance properties of UHPC materials with the shaping advantages of GRC, it has developed a new generation of composite decorative components that enhance structural strength while significantly improving surface fineness. This innovative practice not only gives designers broader creative freedom but also lowers owners' later maintenance costs. In keeping with Qinglong Group's service philosophy of "meticulous attention to detail and the pursuit of excellence," the flawless presentation of every GRC component reflects a dual commitment to architectural aesthetics and engineering quality.