What Work Is Required for the Ongoing Maintenance of UHPC Components?

The core long-term maintenance of UHPC components consists of four main categories: regular inspection, cleaning and care, defect repair, and connector maintenance. Due to its high density and high durability, its maintenance frequency is far lower than that of traditional building materials. Qinglong recommends a maintenance cycle of "annual routine inspection, in-depth testing every 5 years, and free maintenance during the warranty period" to ensure long-term stable use of components.

1. Regular Inspection: Timely Detection of Potential Risks

Inspection is the foundation of maintenance and should focus on key areas and environmental impacts. Routine inspection (once a year): check component surfaces for cracks (width ≥0.1mm), powdering, fading, and edge chipping, with particular attention to vulnerable areas such as cornices, corners, and joints. Qinglong inspections use laser crack detectors to precisely identify fine cracks. In-depth testing (once every 5 years): commission third-party testing agencies to test component strength (rebound method or core drilling method), carbonation depth, and connector corrosion. Qinglong's in-depth testing pass rate reaches 99%, and components over 20 years old retain ≥90% of their original strength. Environment-specific inspection: coastal, industrially polluted, and cold regions should increase inspection frequency (once every 6 months), focusing on corrosion resistance and freeze-thaw resistance. Qinglong's coastal projects are inspected every 6 months to promptly address salt spray corrosion risks.

2. Cleaning and Care: Maintaining Stable Appearance and Performance

Cleaning and care must avoid damaging component surfaces while balancing aesthetics and durability. Routine cleaning: 1-2 times per year, use a high-pressure water gun (pressure ≤0.3MPa) to rinse away surface dust and oil stains; avoid strong acid or strong alkaline cleaners. Qinglong recommends neutral cleaners (pH 6-8), followed by thorough rinsing with clean water. Surface protection: outdoor components should be coated with a weather-resistant protective agent (such as fluorocarbon paint or silane impregnation agent) every 5-8 years to enhance UV and weathering resistance. Qinglong's maintenance service includes professional protective agent application to extend surface service life. Special stain treatment: promptly remove stubborn stains such as chewing gum and paint to prevent long-term adhesion from damaging the surface. Qinglong provides specialized stain removal solutions that do not damage the UHPC surface texture.

3. Defect Repair and Connector Maintenance: Ensuring Structural Safety

Defects should be repaired promptly, with priority given to key load-bearing areas. Crack repair: cracks 0.1-0.3mm wide are repaired with epoxy resin grouting; cracks wider than 0.3mm require removal of the damaged section and filling with UHPC repair material. Qinglong's crack repairs achieve over 95% of the original component's strength. Surface defect repair: small-area edge chipping and honeycombing are repaired with UHPC repair mortar, then ground smooth to ensure appearance consistency. Qinglong's repair materials are 100% material-matched to the original components with no obvious color difference. Connector maintenance: check bolts, hangers, welds, and other connectors for looseness or corrosion; promptly tighten loose connectors and replace corroded connectors (especially outdoors) with stainless steel. Qinglong connector maintenance uses anti-rust grease treatment to extend service life. Joint maintenance: check sealant for aging, cracking, or peeling, and promptly replace aged sealant. Qinglong uses weather-resistant silicone sealant with a service life of ≥10 years.

4. Qinglong's Maintenance Service Guarantee

Professional maintenance services can reduce maintenance costs and improve maintenance results. Warranty period service: warranty period of ≥5 years; defects not caused by human damage during the warranty period (cracks, edge chipping, connector corrosion, etc.) are repaired free of charge. Qinglong provides one free inspection annually to promptly identify and address issues. Customized maintenance plans: specialized maintenance plans are developed based on project environment and component type—for example, coastal projects receive additional corrosion-resistant maintenance, and cold regions receive additional freeze-thaw checks. Qinglong establishes maintenance records for each project, tracking maintenance conditions throughout the process. Emergency response service: on-site within 48 hours of receiving a repair request, and within 24 hours for emergencies (such as loose components or large-area cracks). Qinglong's nationwide office coverage ensures timely maintenance.