Exploration and Application Analysis of Surface Repair Methods for UHPC Shaped Components

Expert Restoration: Bringing Eternal Beauty to UHPC Architectural Components — 28 Years of Industry Experience Safeguarding Architectural Art

In the field of contemporary architectural decoration, UHPC (Ultra-High Performance Concrete), with its outstanding mechanical properties and exceptional formability, has become the "artistic language" of landmark buildings, high-end commercial complexes, and other settings. However, as a new material pursuing refined texture, UHPC architectural components are prone to surface defects during production, transportation, and installation, affecting the aesthetic presentation of buildings. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group, drawing on its full-chain technical expertise, has thoroughly explored the core methods and application logic of UHPC component surface restoration, providing designers and owners with expert-level solutions from "problem diagnosis" to "perfect repair."

I. Causes of Surface Damage to UHPC Components and the Value of Restoration

The surface quality of UHPC components directly determines the visual effect of building facades. Damage typically arises from three scenarios: first, insufficient mold precision or deviations in casting processes during production, causing air bubbles, pitted surfaces, and color differences; second, bumping and squeezing during transportation and installation, resulting in chipped edges, broken corners, and micro-cracks; third, environmental erosion during long-term use, such as UV aging and acid-alkali corrosion. Take a UHPC curtain wall project for a grand theater as an example: millimeter-level surface flaws can significantly compromise the overall visual effect. Through 2,000+ project practices, Qinglong Group has found that scientific restoration can not only recover over 90% of component value but also extend service life beyond 50 years, making it a key link in safeguarding the integrity of architectural art.

II. Four Core Technical Methods for UHPC Surface Restoration

Based on material characteristics and engineering requirements, Qinglong Group has established a systematic restoration system of "diagnosis–restoration–maintenance":

1. Fine Grinding and Filling Technology: For micro-defects such as surface air holes and pinholes, a UHPC-specific repair mortar (compressive strength ≥120MPa) is used, combined with diamond grinding heads for gradient grinding, ensuring a post-restoration surface flatness error of ≤0.5mm. This method successfully resolved uneven light transmittance in the translucent concrete project at Century Plaza on Nanjing East Road.

2. Color Difference Adjustment and Texture Replication Technology: By matching the mineral composition of the original UHPC through spectral analysis, repair materials are formulated with nano-scale color powder and silane modifiers, combined with 3D scanning technology to replicate textures, achieving a color difference of ΔE≤2 between the restored area and the original component. This technology has been applied to shaped relief restoration in multiple landmark projects.

3. Crack Repair and Structural Reinforcement Technology: For micro-cracks with a depth of ≤3mm, low-viscosity epoxy resin penetration reinforcement is applied; for structural damage, carbon fiber cloth reinforcement combined with UHPC grouting technology restores the component's load-bearing capacity. The "General Technical Conditions for Non-Load-Bearing Ultra-High Performance Concrete (UHPC) Components," whose development Qinglong participated in, specifies the quality standards for this restoration process.

4. Protective Coating and Long-Term Maintenance Technology: After restoration is complete, fluorocarbon coatings or silane impregnation treatments are applied to form a protective layer, improving impermeability and UV resistance. Accelerated aging tests at the Nanning production base in Guangxi show that treated UHPC components achieve over 40% improvement in weather resistance.

III. Full-Chain Services Empowering the Implementation of Restoration Solutions

As a national high-tech enterprise integrating detailed design, manufacturing, construction and installation, and after-sales maintenance, Qinglong Group incorporates restoration technology into full lifecycle services: at the design stage, BIM models are used to predict vulnerable parts and optimize component structures; during production, automated casting and online quality monitoring reduce damage at the source; during construction, professional restoration teams are equipped to achieve "repair while installing"; and after-sales service provides 2 years of free maintenance and lifetime technical support. This "prevention–restoration–guarantee" model has helped multiple projects of real estate groups such as Poly and China Overseas achieve zero-rework delivery.

From the GRC artistic components at the Dongguan Women and Children's Activity Center to the UHPC curtain wall of an airport in Saudi Arabia, Qinglong Group has always upheld an attitude of "meticulous craftsmanship and constant pursuit of excellence," transforming material restoration technology into a guardian of architectural art. In the future, as UHPC finds wide application in shaped buildings, landscape sculptures, and other fields, scientific surface restoration will become a core competitiveness for enhancing project quality — this is not only the inheritance of technology, but also the fulfillment of the mission to "create aesthetically beautiful architecture."