Research on Surface Repair Methods and Application Technology for UHPC Shaped Components

The beauty of architecture begins with the restoration of details; the surface treatment technology of UHPC shaped components is the key to achieving ultimate aesthetics and structural safety.

In the field of contemporary architectural decoration, UHPC (Ultra-High Performance Concrete), with its outstanding mechanical properties and freedom of shaping, has become the material of choice for high-end projects such as landmark buildings and commercial complexes. However, UHPC shaped components are prone to surface defects during production, transportation, and installation. How to restore their decorative effect and structural integrity through scientific repair technology is a topic of common concern across the industry. Qinglong Group, with 28 years of full-chain experience in UHPC/GRC/GRG/GRP, will provide an in-depth analysis of the surface repair methods for UHPC shaped components and their application value from three dimensions: technical principles, process innovation, and engineering practice.

I. Causes of UHPC Surface Defects and the Repair Technology System

Surface defects of UHPC shaped components mainly fall into four categories: air bubbles, cracks, color difference, and mechanical damage, and their repair must follow the systematic process of "assessment-treatment-reinforcement". Drawing on 28 years of engineering experience, Qinglong Group has established graded repair standards: for bubble defects with a diameter of ≤2mm, a special repair mortar (compressive strength ≥120MPa) is used for filling and leveling; for hairline cracks shorter than 50mm, structural reinforcement is achieved through epoxy resin injection combined with carbon fiber fabric; for large-area color difference problems, an innovative nano-level color-matching technology is applied to ensure that the surface gloss deviation after repair is ≤3%. This technology system has been successfully applied in benchmark projects such as the East Nanjing Road Century Plaza renovation project, achieving seamless repair of light-transmitting concrete components.

II. Innovative Practice of the Full-Chain Repair Process

As a national high-tech enterprise, Qinglong Group has deeply integrated detailed design with repair technology, forming a full-cycle solution of "prevention-repair-maintenance". At the detailed design stage, BIM technology is used to simulate the stress state of components and optimize reinforcement schemes to reduce stress cracks; in production, vacuum casting technology is adopted to reduce the bubble formation rate; during on-site installation, 3D laser scanning positioning is applied to avoid mechanical damage caused by installation deviations. To meet the special climate requirements of overseas projects, a salt-spray corrosion-resistant repair system has been developed and has passed the 10,000-hour weather resistance test for a landmark project in Penang, Malaysia. This technological breakthrough has increased the market share of Qinglong UHPC products in Southeast Asia by 20%.

III. The Path to Enhancing Building Value with Repair Technology

High-quality surface repair not only solves appearance problems, but also extends the service life of components and reduces whole life-cycle costs. Take a provincial cultural center project as an example: Qinglong Group adopted a composite repair technology of "surface sealing + penetrating crystallization", raising the impermeability grade of UHPC curtain wall panels to P12 and reducing later maintenance costs by 30% compared with traditional processes. As for the shaping fidelity that designers care about, the company uses digital repair methods to control the surface precision of complex double-curved components within ±0.5mm, perfectly presenting the original design intent. This dual guarantee of "technology + aesthetics" has made Qinglong a strategic partner of well-known real estate groups such as Poly and China Overseas.

From material R&D to project implementation, the surface repair technology of UHPC shaped components reflects the architectural decoration industry's ultimate pursuit of "precision craftsmanship". Qinglong Group will continue to leverage its technological strength as a national "specialized, refined, distinctive, and innovative" enterprise to promote the standardization and intelligent development of UHPC repair processes, providing designers with broader creative space and creating enduring architectural works for owners. As advocated by Qinglong's mission of "creating beautiful architecture", every precise repair is a continuation and elevation of the artistic vitality of architecture.