Causes and Solutions for Honeycomb Surface Defects on Installed GRC Components

The refined presentation of architectural decoration depends on perfect control of every detail. As an industry leader with 28 years of full-chain experience in the UHPC/GRC/GRG/GRP materials field, Qinglong Group deeply understands the impact of honeycombing and surface pitting issues in GRC components on project quality. This article provides an in-depth analysis of the causes of this industry pain point and systematic solutions, from material properties and construction techniques to quality control.

Analysis of the Core Causes of Honeycombing and Surface Pitting in GRC Components

GRC (Glass Fiber Reinforced Concrete), as a new decorative material combining strength and shaping advantages, has honeycombing and surface pitting defects that mainly stem from the coordinated failure of material proportioning, production processes, and construction management. At the material stage, insufficient fluidity of the cement paste or uneven dispersion of glass fibers can easily prevent air bubbles from being expelled during vibration; during the production stage, improper mold surface treatment or incorrect selection of release agents directly affects the surface forming quality of components; and deviations in vibration process parameters during construction and installation are key factors causing insufficient local compactness. Qinglong Group's laboratory data shows that more than 68% of surface defects can be traced back to proportioning precision issues during the material mixing stage.

Material Optimization: Controlling GRC Component Quality at the Source

To solve the honeycombing and surface pitting problem, the first step is to establish a scientific material control system. Qinglong Group uses a fully automatic proportioning system to ensure the mixing precision of cement, glass fibers, and admixtures is controlled within ±1%. By adjusting the combined dosage of silica fume and ultrafine mineral powder, the paste fluidity is increased to above 260mm. For components with different shapes, Qinglong has innovatively developed special fiber dispersants, enabling 5-15mm chopped glass fibers to be evenly distributed in the paste and avoiding local fiber agglomeration that forms weak zones. As a national high-tech enterprise, Qinglong participated in formulating the "Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)" (JGJ/T423-2018), which clearly specifies testing methods for material homogeneity, providing a quality benchmark for the industry.

Process Innovation: Digital Production Solves Forming Challenges

In production and manufacturing, Qinglong has introduced BIM technology and 3D scanning technology to achieve parametric control of mold design, ensuring cavity surface flatness errors of ≤0.5mm/m. Vacuum-assisted forming technology is adopted, combined with high-frequency vibration tables (vibration frequency 50-60Hz), so that the concrete is fully compacted in a negative pressure environment and air bubble expulsion efficiency is improved by 40%. For complex curved components, flexible airbag inner mold technology has been innovatively applied, achieving uniform vibration of irregularly shaped parts through step-by-step pressurization. This series of process innovations keeps the first-pass qualification rate of Qinglong GRC components stably above 98%, far exceeding the industry average.

Construction Management: Full-Process Quality Assurance System

The final presentation of high-quality GRC components depends on standardized construction and installation processes. Qinglong has established a full-chain service system from detailed design to after-sales maintenance: 3D laser positioning is performed before installation, with errors controlled within 2mm; special anchoring systems ensure reliable connections between components and the main structure; for on-site jointing areas, special repair mortar has been developed with a 28-day compressive strength of over 60MPa, forming a homogeneous bond with the base material. As an enterprise with Grade II professional contracting qualification for building decoration engineering, Qinglong's construction team strictly implements the "three-inspection system" to ensure every process step meets quality standards.

From material research and development to engineering applications, Qinglong Group always approaches every project with an attitude of "meticulousness and constant improvement." As a vice-chairman unit of the China GRC Association, we not only provide high-quality UHPC/GRC/GRG/GRP products, but are also committed to advancing the industry through technological innovation and standard formulation. Whether it is the complex curved decoration of a grand theater or the shaped curtain wall of a commercial complex, Qinglong can draw on 28 years of professional experience to provide designers and owners with full-process solutions from concept to implementation, ensuring that every architectural detail stands the test of time.