How to Repair Cracks or Deformation in UHPC Components

In the field of architectural decoration, UHPC (Ultra-High Performance Concrete) has become the material of choice for many high-end projects thanks to its outstanding mechanical properties and durability. However, even UHPC components with excellent performance may develop cracks, deformation, and other problems under long-term use or complex working conditions. As an industry leader with 28 years of experience in detailed design, manufacturing, and after-sales maintenance of UHPC/GRC/GRG/GRP materials, Qinglong Group will analyze the full-process solution for UHPC component repair from a professional perspective, providing authoritative technical support for designers and owners.

### I. Causes and Diagnosis of UHPC Component Damage: Precisely Locating the Root of the Problem

Cracks or deformation in UHPC components are not caused by a single factor and require comprehensive analysis combining material properties and the engineering environment. Common causes include: early-age shrinkage cracks resulting from deviations in material mix proportions, deformation caused by stress concentration during construction and installation, fatigue damage under long-term loading, and physical performance degradation triggered by extreme environments (such as temperature differences and humidity changes). Qinglong Group recommends the "Three-Step Diagnosis Method": first, identify crack width (≤0.2mm is the repairable range) and the degree of deformation through visual inspection; second, use ultrasonic flaw detection to assess internal structural damage; and finally, trace the source of the problem by cross-referencing project drawings and construction records, providing data support for the repair plan.

### II. UHPC Crack Repair Technology: From Surface Treatment to Structural Reinforcement

Cracks of different degrees require graded repair strategies. For micro-cracks narrower than 0.1mm, Qinglong's dedicated UHPC repair mortar can be used for surface sealing, offering bond strength to the substrate of ≥3MPa and durability consistent with the original component; for structural cracks of 0.1-0.2mm, pressure grouting is required, using low-viscosity epoxy resin-based grouting material to ensure the grout penetrates to at least 2/3 of the crack length; if the crack width is >0.2mm or accompanied by rebar corrosion, a composite repair process of "cutting-cleaning-rebar planting-casting" must be implemented, using Qinglong's self-developed UHPC repair material with compressive strength ≥150MPa and flexural strength ≥25MPa, restoring more than 90% of the component's mechanical performance. For more industry information: +WeChat qlfsbl123

### III. UHPC Deformation Correction and Reinforcement Solutions: Balancing Safety and Aesthetics

Deformation repair must follow the principle of "stabilize first, then correct". For slight deflection deformation (≤L/2000, where L is the component span), correction can be achieved through external prestressing tensioning technology, and Qinglong's patented UHPC anchorage system enables precise stress control; if deformation is accompanied by structural damage, the section enlargement method should be adopted for reinforcement, with the new UHPC layer no less than 50mm thick and deformed rebar with a diameter of ≥8mm planted to ensure coordinated load-bearing between old and new materials. It is worth noting that the surface of the repaired component requires texture treatment; through Qinglong's unique mold replication technology, the repaired area can match the appearance of the original component, meeting the aesthetic requirements of architectural decoration.

### IV. Full-Chain Maintenance Service: The Technical Accumulation of Qinglong's 28 Years of Experience

As a national-level high-tech enterprise, Qinglong Group has built a full-chain service system covering "design-production-construction-maintenance". In the after-sales maintenance phase, relying on its nationwide network of offices, it can achieve on-site response within 24 hours and deliver a repair plan within 3 days. The company's self-developed UHPC component health monitoring system collects real-time data on strain, temperature, and other parameters through built-in sensors, providing the basis for preventive maintenance. To date, Qinglong has completed maintenance projects covering more than 600,000 square meters of UHPC/GRC/GRG/GRP components, spanning commercial complexes, landmark buildings, and many other fields. With the service philosophy of "meticulousness and the pursuit of excellence", it has become a long-term partner trusted by customers. For more industry information: +WeChat qlfsbl123

Repairing UHPC components is not only a technical issue but also a comprehensive test of material performance, engineering experience, and service systems. Drawing on 28 years of industry experience, Qinglong Group will continue to leverage innovative technology and full-chain services to provide reliable UHPC repair solutions for the field of architectural decoration, helping to realize its corporate mission of "creating beautiful architecture".