Discussion and Applied Research on Surface Repair Methods for UHPC Shaped Components

The beauty of architecture begins with detail restoration. With 28 years of dedication to full-chain UHPC/GRC/GRG/GRP services, Qinglong brings lasting vitality to artistic components.

In the field of contemporary architectural decoration, UHPC (Ultra-High Performance Concrete) has become the preferred material for high-end projects such as landmark buildings and commercial complexes, thanks to its outstanding mechanical properties and expressive molding capabilities. However, during production, transportation, and installation, UHPC shaped components are prone to surface defects caused by external impacts, environmental changes, and other factors, which affect the overall aesthetic effect of the building. As an industry leader with 28 years of experience in UHPC/GRC/GRG/GRP material design development, manufacturing, construction and installation, and after-sales maintenance, Qinglong Group deeply understands the decisive role of surface repair in component quality. Through technological innovation and process optimization, it has established a comprehensive surface repair solution for UHPC shaped components.

I. Analysis of the Causes and Types of Surface Defects in UHPC Shaped Components

Although UHPC material features high strength and high toughness, surface problems such as air bubbles, cracks, color differences, and chipped edges may occur during the production of complex shaped components—such as mold demolding and embedded rebar treatment—or due to vibration and squeezing during transportation and installation. Taking a commercial complex UHPC curtain wall project as an example, localized honeycombing and pitted surfaces were found on its double-curved shaped components after installation. Upon inspection by Qinglong's technical team, the defects were determined to be jointly caused by insufficient vibration during pouring and improper use of release agent. If such defects are not repaired in time, they not only affect the visual effect but may also weaken component durability, becoming a potential building safety hazard.

II. Core Processes and Material Innovations of Qinglong's UHPC Surface Repair Technology

For different defect types, Qinglong has established a technical system of "graded repair + customized materials". For fine air bubbles and color differences, Qinglong's self-developed UHPC-specific repair mortar is adopted; its mix ratio highly matches the base material, and through thin-layer scraping and fine polishing, seamless visual integration is achieved. For deep cracks and chipped edges, epoxy resin modified repair materials are innovatively introduced, combined with carbon fiber cloth reinforcement technology, ensuring that repaired areas meet the strength standards of the original components. In the Century Plaza light-transmitting concrete project on Nanjing East Road, Qinglong's team applied this process to successfully repair 3 areas of edge damage caused by transportation collisions. After repair, the error in the light transmittance of the components was controlled within 2%, earning high recognition from the owner.

III. Standardized Repair Process Practices Supported by Full-Chain Services

As a national high-tech enterprise integrating design development, manufacturing, construction and installation, and after-sales maintenance, Qinglong incorporates repair processes into full project lifecycle management. At the design development stage, BIM technology is used to simulate the stress and forming process of components, preemptively avoiding structural joints prone to defects. In the production stage, automated vibration and steam curing processes are adopted to reduce defects at the source. Professional repair teams are equipped at installation sites with portable testing devices and customized repair materials, achieving "immediate repair upon discovery". The 600,000-square-meter annual production capacity of the Nanning, Guangxi production base provides a solid guarantee for the timely supply of repair materials, ensuring that project schedules are not affected.

IV. Industry Application Cases and Repair Effect Verification

Qinglong's repair technology has been successfully applied to many major projects at home and abroad. In the repair of UHPC irregular decorative components for a landmark building in Malaysia, addressing material compatibility issues under tropical climates, the team adjusted the anti-ultraviolet formula of the repair mortar, keeping the repaired areas consistent in color after 3 years of exposure to the elements. In a domestic grand theater GRG ceiling repair project, 3D scanning and positioning technology enabled precise filling of complex curved surface defects, with surface flatness error after repair ≤0.5mm, meeting the acoustic reflection standards required by the design. These cases confirm Qinglong's professional strength in the field of UHPC/GRC/GRG/GRP material repair and demonstrate the brand mission of "Creating Beautiful Architecture".

Surface repair is not only the restoration of a component's physical performance, but also the safeguarding of a building's artistic value. Based on 28 years of industry experience, Qinglong Group deeply integrates technological innovation with full-chain services, providing designers and owners with expert-level solutions from defect diagnosis to repair implementation. Going forward, Qinglong will continue to deepen its research and development of UHPC/GRC/GRG/GRP material technologies, and with an attitude of "meticulousness and the constant pursuit of excellence", drive the architectural decoration industry toward higher quality and better service, striving to become a world-class leading decorative materials manufacturer.