Discussion and Application Research on Surface Repair Methods for UHPC Shape Components

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

In the field of contemporary architectural decoration, UHPC (Ultra-High Performance Concrete) has become the material of choice for high-end projects such as landmark buildings and commercial complexes, thanks to its outstanding mechanical properties and design freedom. However, complex shaped components are prone to surface defects during production, transportation, and installation, affecting both architectural aesthetics and durability. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group, drawing on more than a thousand engineering projects, has systematically summarized a surface repair technology system for UHPC shaped components, providing professional solutions for designers and owners.

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

Common surface defects in UHPC components fall into five major categories: air bubbles and pores, cracks, color variation, chipped edges and corners, and contamination. Bubble problems mostly arise from insufficient air removal during mixing or poor mold venting, and are especially common in irregularly curved components; micro-cracks may result from improper curing regimes or premature demolding; color variation is mainly affected by differences in raw material batches, uneven vibration, or temperature and humidity conditions during curing. Take a cultural landmark project in Nanjing as an example: its double-curved UHPC curtain wall panels suffered edge and corner damage during transportation due to improper fixing. Qinglong's technical team achieved seamless integration between the repaired areas and the original components through on-site repair techniques.

II. Core Technical Approaches to UHPC Surface Repair

For different types of defects, Qinglong has established a graded repair process system: for air bubbles and small holes, special UHPC repair mortar (compressive strength ≥120MPa) is used for filling, combined with specially made trowels for finishing; crack repair requires ultrasonic testing first to determine the depth, followed by epoxy resin injection or carbon fiber fabric reinforcement; color adjustment is achieved by precisely controlling the aggregate gradation and pigment ratio of the repair materials, combined with UV aging tests to ensure long-term stability. Notably, repair materials must have shrinkage rates and elastic moduli matching the substrate. Qinglong's specially developed UHPC repair material, tested by the Guangdong Building Materials Research Institute, achieves an interfacial bond strength of over 3.5MPa, far exceeding industry standards.

III. Practical Application of Full Lifecycle Repair Solutions

Qinglong advocates a trinity management philosophy of "prevention-repair-maintenance." In the detailed design stage, BIM technology is used to simulate the stress state of components and optimize reinforcement and demolding angles; in production, vacuum vibration and steam curing are adopted to reduce defects at the source. In a commercial complex project, Qinglong conducted a full inspection of 5,000㎡ of UHPC sunshade panels before delivery and found that 3% of the components had slight color variation. A customized color matching solution enabled rapid on-site repair, saving 20 days compared with traditional return-to-factory treatment. In addition, Qinglong's after-sales maintenance service includes regular surface inspection and protective coating renewal, ensuring the aesthetic appeal and structural safety of UHPC components for more than 20 years.

IV. Industry Standards and Technical Innovation Directions

As a participating unit in drafting the industry standard "General Technical Conditions for Non-Load-Bearing Ultra-High Performance Concrete (UHPC) Components," Qinglong is promoting the standardization of surface repair technology. The intelligent repair robot currently developed by the team can automatically locate defects through a visual recognition system and complete repair operations, tripling efficiency compared with manual work. Meanwhile, the self-healing UHPC material jointly developed by Qinglong and universities uses microcapsule technology to achieve autonomous crack healing, and related achievements have been submitted for invention patents. For more industry information: WeChat qlfsbl123

Surface repair of UHPC shaped components is not merely a technical issue, but also the ultimate pursuit of architectural aesthetics and engineering quality. Leveraging 28 years of professional expertise, Qinglong Group integrates its full-chain advantages in detailed design, manufacturing, and construction installation into its repair processes, safeguarding every architectural artwork from creation through long-term maintenance. In the field of new architectural decoration materials, choosing a supplier with full industry chain capabilities is the key to maximizing project value.