Analysis of Technical Requirements and Design Specifications for Hanger Spacing and Load-Bearing Capacity in UHPC Curtain Wall Panel Installation

In the field of architectural decoration, details determine quality, and the polishing process of GRC decorative panels is a core step that affects the final presentation. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the importance of the polishing process to project quality. This article provides an in-depth analysis of the key steps and quality control points of the GRC decorative panel polishing process, offering professional technical reference for designers and owners.

### Core Value and Industry Standards of the GRC Decorative Panel Polishing Process GRC (glass fiber reinforced concrete), with its advantages of light weight, high strength and flexible shaping, is widely used in high-end projects such as grand theaters, commercial complexes and landmark buildings. The polishing process not only affects the surface flatness and aesthetics of decorative panels, but also directly relates to subsequent coating adhesion and durability. The Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), which Qinglong Group participated in formulating, clearly stipulates that the surface roughness of GRC decorative panels must be controlled within Ra2.5-Ra6.3μm, with no obvious sand holes, air bubbles or exposed fibers. This standard has become an important basis for industry quality control.

### Key Steps: Full-Process Control from Rough Grinding to Fine Finishing **1. Initial Grinding: Basic Contour Shaping** Demolded GRC components must first undergo initial grinding, using 80-120 grit sandpaper or grinding wheels, focusing on treating mold joint marks, flash and surface protrusions. At this stage, uniform pressure must be applied to avoid component thickness deviation caused by excessive local grinding. Qinglong's production base uses automated polishing equipment combined with manual calibration, increasing initial grinding efficiency by 30% while keeping errors within ±0.5mm. **2. Intermediate Grinding: Fine Leveling and Defect Repair** Use 180-240 grit sandpaper for a second round of surface polishing, focusing on eliminating initial grinding marks and repairing defects such as air holes and cracks. Qinglong's original "layered filling method" — using GRC repair mortar with the same mix ratio for layer-by-layer repair — ensures tight bonding between the repaired area and the base material, preventing later cracking. This step requires real-time monitoring of surface flatness through 3D scanning technology to ensure errors do not exceed 1mm/m. **3. Fine Grinding: Texture and Gloss Shaping** Select 320-600 grit sandpaper for fine grinding according to design requirements. Stone-imitation components need to retain natural texture, while mirror-finish components must achieve a mirror-like fineness. Qinglong has developed specialized polishing tools for different finish effects, such as flexible grinding heads for shaped components and mechanical track grinding for straight lines, ensuring polishing uniformity per square meter is increased to over 98%. **4. Dust Removal and Quality Inspection: Details Determine Success or Failure** After polishing, high-pressure dust removal is required to clear surface dust and avoid affecting coating adhesion. The quality inspection adopts a "double-check system": first inspecting surface flaws under strong light, then conducting quantitative testing with a roughness meter to ensure compliance with Qinglong's internal control standards (10% higher than industry standards).

### Quality Control Points: Comprehensive Assurance from Raw Materials to Process **1. Material Compatibility Control** The fiber content and cement grade of GRC base materials directly affect polishing results. Qinglong uses high-purity alkali-resistant glass fiber (content ≥5%) and rapid-hardening sulphoaluminate cement to ensure component strength reaches over 20MPa, avoiding "chipping" and "sand raising" phenomena during grinding. **2. Environmental Temperature and Humidity Management** The polishing environment must maintain a temperature of 15-25°C and humidity of 50%-70%. Excessive humidity easily causes sandpaper clogging, while low temperature affects the curing of repair materials. Qinglong's production workshops are equipped with intelligent environmental control systems, maintaining constant temperature and humidity year-round to ensure process stability. **3. Personnel Skill Standardization** All polishing workers must pass Qinglong's "three-level training system" (theoretical assessment + practical drills + project mentoring) and skillfully master polishing parameters for different components. For example, double-curved GRC components require a "from inside to outside, spiral progressive" polishing technique to avoid surface cracking caused by stress concentration.

### Qinglong's Process Advantages: Technical Empowerment from 28 Years of Experience As a national high-tech enterprise and GRC standard-setting organization, Qinglong integrates its full-chain advantages into the polishing process: BIM technology is used in the detailed design stage to optimize component shapes and reduce grinding difficulty; automated production lines are adopted in the production stage to ensure polishing precision; and integrated "polishing-coating" services are provided during construction and installation to avoid cross-operation contamination. From the GRC curtain wall of the Dongguan Women and Children's Activity Center to the translucent concrete project at Nanjing East Road Century Plaza, Qinglong's polishing process has always maintained a meticulous, excellence-pursuing attitude, endowing buildings with delicate texture and lasting vitality.

The polishing process is the key transformation of GRC decorative panels from "industrial products" to "works of art". Choosing a manufacturer with full-chain capabilities not only provides technical assurance but also achieves perfect unity of design creativity and engineering implementation. With 28 years of professional experience, Qinglong Group is willing to provide one-stop solutions for every project, from detailed design to after-sales maintenance, to jointly create beautiful architecture.