Construction Process and Key Technical Points for Retrofitting Existing Building Exterior Walls with UHPC Panels

Exterior wall renovation of existing buildings is a key topic in urban renewal, and UHPC panels are becoming the preferred solution thanks to their outstanding performance. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group provides an in-depth analysis of the application of UHPC panels in exterior wall renovation, from construction procedures to key technologies.

**I. Complete Construction Process of UHPC Panel Exterior Wall Renovation**

Exterior wall renovation of existing buildings with UHPC panels must follow a rigorous construction logic to ensure project quality and safety. The first step is preliminary survey and design deepening: the original building structure must be comprehensively inspected, and customized UHPC panel designs completed in line with the architectural style requirements. This step directly determines the precision of subsequent installation. Leveraging the technical strength of its national-level R&D center, Qinglong Group provides full-process support from structural assessment to parametric design, ensuring solutions that meet both safety codes and design aesthetics.

Next comes substrate treatment and embedded parts installation: the original wall's surface attachments must be cleaned and substrate defects repaired, while dedicated connectors are fixed according to the design drawings. Position deviations of embedded parts must be strictly controlled at this stage; Qinglong combines BIM technology with 3D scanning to keep errors within ±2mm, laying a solid foundation for the stable installation of UHPC panels. The process then moves to factory prefabrication of UHPC panels and on-site hoisting. Qinglong's Guangxi production base has an annual capacity of 600,000 square meters and uses automated production lines to ensure panel precision, while dedicated hoisting equipment enables efficient on-site installation, greatly shortening the construction period.

**II. Key Technical Points of UHPC Panel Construction**

The technical core of UHPC panel exterior wall renovation lies in resolving the contradiction between the load limits of old buildings and the performance requirements of the new decorative layer. Through optimized material formulations, Qinglong Group controls UHPC panel thickness to 20–30mm, with a weight only 1/4 that of traditional stone, perfectly matching the load-bearing needs of existing buildings. Meanwhile, the panel surface adopts a special texture treatment process that can realistically reproduce the look of stone, metal and other materials, meeting the renovation needs of different architectural styles.

Joint treatment and waterproof sealing are another major technical challenge. Qinglong's original elastic sealing technology, using dedicated weather-resistant sealant and a backing system, effectively copes with building settlement and temperature deformation, avoiding leakage risks. In addition, to address the uneven substrates of old buildings, Qinglong has developed an adjustable connector system offering ±50mm three-dimensional adjustment, ensuring the flatness and verticality of UHPC panel installation. This technology has been successfully applied in projects such as the Century Plaza renovation on Nanjing East Road.

**III. Qinglong Group's Full-Chain Service Assurance System**

As a national high-tech enterprise, Qinglong Group's full-chain service capability—from deepened design to after-sales maintenance—provides solid assurance for UHPC panel exterior wall renovation projects. The company has participated in formulating multiple industry standards, including "General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components," and its technical strength has received authoritative recognition. During project implementation, Qinglong deploys professional construction teams and applies construction management experience backed by its Grade II professional contracting qualification for building curtain walls, ensuring that every step complies with standards.

From the innovative GRC application at the Dongguan Women and Children's Activity Center to UHPC exports for overseas projects, Qinglong Group's 28 years of industry experience have formed mature solution capabilities. Choosing Qinglong means not only choosing high-quality UHPC products, but also worry-free service from design to delivery. Moving forward, Qinglong will continue to uphold its mission of "Creating Beautiful Architecture," providing more innovative materials and technical support for existing building renovation and contributing to the high-quality development of urban renewal.