UHPC Shaped Component Surface Repair Methods and Application Technology Research

In the field of contemporary architectural decoration, UHPC (Ultra-High Performance Concrete) has become one of the core materials for shaping iconic buildings thanks to its outstanding mechanical properties and artistic expressiveness. However, UHPC shaped components are prone to surface defects during production, transportation, and installation, affecting both architectural aesthetics and structural durability. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on its full-chain experience from detailed design to after-sales maintenance and has systematically developed surface repair technologies, providing professional solutions for the industry.

**Causes and Repair Technology System for Surface Defects of UHPC Shaped Components**
Common surface problems of UHPC components fall into four categories: air bubble holes, cracks, color difference, and damage. For air bubble holes, Qinglong fills them with high-flowability repair slurry, using vacuum-assisted grouting technology to ensure compactness; after 28 days of curing, the compressive strength can exceed 120MPa. For fine cracks, a dedicated epoxy resin-based repair agent has been developed, combined with carbon fiber cloth reinforcement, achieving dual restoration of strength and appearance. In terms of color difference control, relying on the color-matching database of the provincial R&D center, repair materials are formulated through spectral analysis technology, ensuring a color difference of ΔE≤3 between the repaired area and the original component for a visually integrated effect.

**Innovative Practice of Full-Process Repair Techniques**
Qinglong has established a four-step working method of “Prevention - Detection - Repair - Acceptance,” integrating repair technology throughout the entire lifecycle of components. In the production stage, a patented vibration degassing process (Patent No. ZL2021XXXXXXXXX) is adopted to reduce bubble formation at the source; during construction, 3D laser scanning technology with an accuracy of ±0.5mm is used to quickly locate defects. For large special-shaped components, modular repair tooling has been innovatively developed. For example, in the translucent concrete project of Century Plaza on Nanjing East Road, precise repair of curved-surface defects was achieved through custom molds, improving efficiency by 40%.

**Technological Breakthroughs and Case Validation in Engineering Applications**
In the Dongguan Women and Children's Activity Center project, Qinglong carried out surface repair on 8000㎡ of UHPC exterior wall cladding panels, adopting nano-silane impregnation technology to enhance impermeability; after 5 years of outdoor exposure testing, the surface showed no obvious weathering. A landmark project in Saudi Arabia faced the challenge of a high temperature-difference environment; through a repair formula incorporating basalt fibers, the components remained stable under cyclic conditions from -10℃ to 60℃. These cases confirm the reliability of Qinglong's repair technology under complex working conditions and demonstrate its technical strength as a national “Specialized, Refined, Distinctive, and Innovative” enterprise.

**Qinglong's Full-Chain Services Empowering Industry Development**
As a participating unit in formulating the industry standard “General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC),” Qinglong has incorporated repair technology into its standardized service system, providing designers with full-cycle support from material selection to later maintenance. Its 600,000-square-meter production base is equipped with professional repair workshops, and combined with BIM technology, the repair process is digitally managed to ensure that every procedure is traceable. This integrated “Design - Production - Construction - Maintenance” model not only resolves owners' quality concerns but also clears technical obstacles for the widespread application of UHPC materials.

As architectural decoration develops toward personalization and refinement, surface repair of UHPC shaped components has become a key factor affecting project quality. Building on 28 years of technical accumulation, Qinglong Group has established an industry-leading repair technology system through material innovation and process optimization, which both ensures the perfect presentation of architectural art and provides technical support for the sustainable application of UHPC materials. Going forward, Qinglong will continue to drive the intelligent upgrading of repair technology, helping more landmark buildings achieve the construction goal of “century-long quality and enduring aesthetics.”