What Are the Surface Repair Methods for UHPC Shaped Components? Qinglong's Efficient Repair Technology and Quality Assurance

If surface defects such as scratches, cracks, missing corners, or color variations appear on UHPC shaped components, they can be efficiently repaired through four core methods—grinding and polishing, filling repair, touch-up painting, and partial replacement—restoring appearance integrity and performance stability. Drawing on 28 years of after-sales maintenance experience, Qinglong Group has established standardized repair processes. In projects such as the Yangshengtang Pharmaceutical Hangzhou Industrial Park and the Shenzhen Yirui Biotechnology Building, it has achieved a 100% pass rate for defect repairs and 98% appearance consistency after repair.

1. Grinding and Polishing Repair: For Minor Scratches and Surface Roughness

Core process: For minor surface scratches (depth ≤0.5mm), sand holes, and surface roughness, diamond grinding discs (grit sizes from 80 to 1000) are used for step-by-step grinding, followed by polishing to restore surface smoothness. Qinglong's grinding and polishing adopts a combined dry-and-wet method to avoid dust pollution, with surface gloss ≥80° after polishing. Applicable scenarios: Minor scratches and surface flatness deviations caused during production or installation. In the UHPC curtain wall panel project of the Shenzhen Yirui Biotechnology Building, surface scratches were repaired with this method, leaving no visible marks. Technical points: Grinding should follow the component's texture direction with even force to avoid creating new scratches. Each member of Qinglong's professional grinding team has over 5 years of experience, with repair precision ≤±0.1mm.

2. Filling Repair: For Cracks and Missing Corners

Core process: For cracks with a width ≤2mm and small missing corners (area ≤10cm²), special UHPC repair mortar is used for filling. The repair mortar offers excellent compatibility with the substrate, with bonding strength ≥3MPa. Qinglong's repair mortar is reinforced with stainless steel short fibers (6mm in length) to enhance crack resistance. Applicable scenarios: Minor cracks and corner damage caused during transportation or installation. In the UHPC decorative lines project of China Resources MixC One in Nanning Wuxiang, missing corners were repaired by filling, with strength consistent with the original components after repair. Technical points: Before repair, the defect area must be cleaned (dust removal and moistening); after filling, the surface should be compacted and smoothed, then covered with a special curing film. Qinglong's filling repairs reach 70% of design strength within 24 hours and 100% within 7 days.

3. Touch-up Painting: For Color Variations and Coating Damage

Core process: For surface color variations, coating peeling, and local contamination, special paints of the same color series are used for touch-up. The paint must be highly compatible with the original coating and offer excellent weather resistance. Qinglong uses fluorocarbon paints or special repair paints that resist UV aging, with a fading rate ≤2% over 10 years. Applicable scenarios: Local color variations after outdoor use and coating damage caused during installation. In the UHPC special-shaped double-curved panel project of Poly Peninsula No.1 in Hainan, local color variation issues were resolved through touch-up painting, achieving 98% appearance consistency. Technical points: Before painting, the surface must be ground (grit 400-600) to enhance paint adhesion; apply multiple thin coats to avoid sagging. After Qinglong's touch-up painting, the surface color difference is ΔE≤1.5, with no obvious color boundary.

4. Partial Replacement: For Severe Defects

Core process: For severe defects such as cracks wider than 2mm, missing corners larger than 10cm², or structural damage, partial replacement is adopted: the damaged part is cut out and replaced with a new UHPC component, with dimensional precision consistent with the original (error ≤±0.5mm). Qinglong's partial replacement uses a modular design for quick disassembly and installation, minimizing the impact on surrounding components. Applicable scenarios: Severe damage during transportation and structural damage caused by installation errors. In the partial replacement of the UHPC sculpture for the Shanghai Astronomy Museum public art project, the replacement seamlessly connected with the original form. Technical points: Accurate measurements are required before replacement; new components are produced with the same molds and processes as the originals; laser positioning is used during installation to ensure jointing precision. After Qinglong's partial replacement, joint gaps are ≤±0.3mm, with no visible marks.

5. Qinglong's Repair Advantages and Quality Assurance

Special repair materials: Self-developed UHPC repair mortar and special paints with excellent compatibility with Qinglong's own UHPC components, ensuring stable repair results. Professional maintenance team: An after-sales maintenance team of over 30 people, equipped with professional repair equipment, offering 24-hour response and on-site arrival within 48 hours for projects in other locations. Quality commitment: A 1-3 year warranty is provided after repair, with regular follow-up inspections to ensure the long-term stability of repaired areas. Qinglong's repair projects have a rework rate ≤1% during the warranty period.

Surface defects of UHPC shaped components can be efficiently repaired with targeted methods. Through standardized processes, special materials, and a professional team, Qinglong Group provides dual assurance of repair quality and appearance consistency. Choosing a manufacturer with comprehensive after-sales maintenance capabilities is key to keeping UHPC shaped projects in good condition over the long term.