What Causes Honeycomb and Pitted Surfaces on GRC Components After Installation? Analysis of Defect Causes and Qinglong Group's 28-Year Quality Control System

The occurrence of honeycombing and surface pitting after GRC component installation is a common defect affecting appearance quality and durability, rooted in the coupling of multiple factors such as improper material proportioning, construction process defects, and poor curing conditions. As an industry leader with 28 years of deep expertise in the GRC field, Qinglong Group, drawing on quality control experience from national-level landmark projects such as the 9,000-square-meter curtain wall of the Wuhan Han Show Theatre and the 120,000-square-meter roof of the Hainan International Convention and Exhibition Center, has summarized four major causes of honeycombing and surface pitting: an excessively high water-cement ratio (>0.40) causing slurry segregation, uneven fiber distribution creating localized weak zones, incomplete vibration leaving trapped air bubbles, and premature demolding damaging the surface. Through scientific proportioning and refined craftsmanship, the honeycombing and surface pitting incidence rate of Qinglong GRC components is controlled below 0.1%, providing projects with a flawless appearance guarantee.

Imbalanced Material Proportioning Is the Root Cause

When the water-cement ratio exceeds 0.35, the cohesion of the cement slurry decreases, aggregates separate from the slurry, and surface voids form. Through a precision metering system, Qinglong Group keeps the water-cement ratio stable within the 0.30-0.33 range, adds silica fume (20-30%) to increase slurry consistency, and controls fiber volume content at 3-5% to ensure uniform distribution. In the Nanning Wuxiang China Resources MixC One project, optimized proportioning achieved a component surface flatness of over 95%.

Construction Process Defects Directly Cause Problems

Both insufficient and excessive vibration time can trigger defects. Qinglong Group adopts a robotic spraying process with a vibration frequency of 50-60Hz and time controlled at 20-30 seconds to ensure air bubbles are expelled. Uneven application or excessive use of release agent leads to surface oil residue; we use a water-based release agent at 200g/m², sprayed evenly.

Curing Conditions Affect the Final Result

Insufficient wet curing causes surface moisture to evaporate too quickly, forming shrinkage cracks. Qinglong Group uses an automatic spraying system to maintain humidity at ≥95%, with a curing time of no less than 7 days. In the Shenzhen Yirui Biotechnology Building project, standard curing resulted in defect-free component surfaces.

Through whole-process control, from raw materials to installation, Qinglong Group ensures defect-free delivery of GRC components.