Discussion on Surface Repair Methods and Application Techniques for UHPC Shaped Components

Restoring details with craftsmanship, continuing aesthetics with technology — a full-cycle solution for the surface repair of UHPC shaped components

In the field of contemporary architectural decoration, UHPC (Ultra-High Performance Concrete), with its ultra-high strength, excellent durability, and exceptional shaping capability, has become the material of choice for high-end projects such as landmark buildings and commercial complexes. However, complex shaped components are prone to surface defects during production, transportation, and installation. How to restore their design aesthetics and structural performance through scientific repair technology is a topic of common concern across the industry. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group leverages its full-chain technical advantages to form a systematic surface repair solution, providing designers and owners with professional support from defect diagnosis to long-term maintenance.

I. Causes and Classification of Surface Defects in UHPC Shaped Components

The surface quality of UHPC components directly affects the final presentation of a building, and its defects mainly arise from three stages: bubbles, pitted surfaces, and color differences during production; bumps and cracks during transportation and installation; and weathering erosion during later use. Taking the translucent concrete project of the Nanjing East Road Century Plaza renovation (a Qinglong Group UHPC Innovation Award Silver Award project) as an example, oversized curved components are prone to honeycomb-like air pores during prefabrication due to uneven vibration, and minor collisions during on-site hoisting may also cause edge and corner damage. If these defects are not properly addressed, they not only affect aesthetics but may also weaken the durability and structural safety of the components.

II. Qinglong's Full-Process Repair Technology: From Material Matching to Process Innovation

For different types of defects, Qinglong has established a three-step technical system of "diagnosis – repair – protection". At the material level, its self-developed UHPC-specific repair mortar achieves over 95% compatibility with the substrate, ensuring no obvious color difference or interface delamination after repair; at the process level, 3D scanning and positioning technology enables precise defect identification, combined with manual scraping and mechanical grinding, keeping the flatness error of the repaired surface within 0.5mm/m. For example, in the GRC project of the Dongguan Women and Children's Activity Center, the Qinglong team used this technology to successfully repair the surface flaws of more than 200 shaped decorative panels, safeguarding the artistic expression of the overall building.

III. Engineering Application and Value Enhancement of Repair Technology

High-quality repair technology not only solves appearance problems but also extends the service life of components. In a coastal landmark project in which Qinglong participated, to address surface efflorescence caused by sea breeze erosion, an innovative composite solution of "penetrating silane protection + nano-scale coating" was adopted, improving the weather resistance of UHPC components by 30%. This integrated "repair + protection" service has become the reassuring choice of real estate developers and public project managers — it not only meets the ultimate pursuit of design effects but also reduces later maintenance costs, achieving dual enhancement of aesthetic and economic value.

As a national high-tech enterprise and a participant in industry standard formulation, Qinglong Group has always taken "creating beautiful architecture" as its mission, transforming 28 years of engineering experience into technical advantages. Whether it is repairing fine cracks in UHPC translucent curtain walls or adjusting the curved-surface flatness of GRG ceilings, Qinglong can provide customers with expert-level solutions through its full-chain capabilities in deepened design, manufacturing, construction and installation, and after-sales maintenance. In the future, Qinglong will continue to explore innovations in material repair technology, so that every UHPC/GRC/GRG/GRP component can retain its original stunning beauty through the test of time.