Detailed Construction Process for Retrofitting Existing Building Exterior Walls with UHPC Panels

A Detailed Guide to the Construction Process for Retrofitting Existing Building Facades with UHPC Panels: 28 Years of Industry Experience on How to Efficiently Renew Building Facades

Amid the wave of existing building renewal and urban landscape enhancement, ultra-high performance concrete (UHPC) is becoming the material of choice in the field of facade renovation thanks to its outstanding mechanical properties and design expressiveness. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group leverages full-chain service capabilities to provide integrated solutions for building renewal, from detailed design to after-sales maintenance. Drawing on engineering practice, this article systematically breaks down the standardized construction process for using UHPC panels in existing building facade renovation, offering professional technical reference for designers, owners, and engineering parties.

I. Preliminary Assessment and Scheme Design: The Scientific Prerequisites for UHPC Panel Application

The core of existing building facade renovation lies in balancing safety and aesthetic requirements. Three key steps must be completed before construction begins: structural safety inspection, where professional institutions assess the strength of the original wall substrate and the load-bearing capacity of anchoring points to ensure they meet the load requirements of UHPC panels (surface density of approximately 150-200kg/㎡); on-site 3D scanning and modeling, using BIM technology to obtain precise data on the building facade, providing the basis for parametric cutting and installation positioning of UHPC panels; and detailed design optimization, selecting UHPC panel thickness (typically 8-20mm), surface treatment processes (stone-imitation, textured, or fair-faced effects), and integrated insulation solutions according to the building's functional needs. Qinglong Group can provide full-process technical support at this stage, from material selection to joint detailing.

II. Customized UHPC Panel Production: Industrial Manufacturing Ensures Stable Quality

As a national high-tech enterprise, Qinglong Group operates modern production lines with an annual capacity of 600,000 square meters. Its UHPC panel production employs automated material distribution, vacuum vibration, and steam curing processes, ensuring product flexural strength ≥120MPa and elastic modulus ≥40GPa. To meet the customized needs of renovation projects, complex shapes can be achieved through custom molds (with a minimum curvature radius of 300mm), while insulation and fireproof layers can be integrated to form composite panels, effectively reducing on-site construction complexity. Production strictly complies with the T/CBMF171-2022 standard for Ultra-High Performance Concrete (UHPC) Exterior Wall Panels, and every batch of products undergoes third-party testing to guarantee stable material performance.

III. Key On-Site Construction Procedures: Refined Installation Ensures Engineering Quality

The construction phase must strictly follow four major procedures: substrate treatment, removing attachments from the original wall and applying a bonding agent, with carbon fiber cloth or angle steel reinforcement for aged walls; measurement and layout, using 3D laser positioning technology to ensure installation errors ≤2mm; dry-hanging system installation, fixed with a combination of stainless steel connectors and expansion bolts, with Qinglong's proprietary seismic joint design accommodating ±30mm displacement deformation; and UHPC panel installation and sealing, with panels precisely positioned by lifting equipment and then jointed with specialized weather-resistant sealant to form a closed-loop system that is waterproof yet breathable. Special attention must be paid to balancing load transfer between new and old structures during this process. Qinglong's team holding a Grade II Building Engineering Professional Contracting qualification can provide full-process construction management.

IV. Acceptance and Maintenance: A Quality Commitment for Long-Term Operation

Project acceptance must cover appearance quality (surface flatness ≤3mm/2m), mechanical properties (anchoring force ≥15kN), and durability indicators (frost resistance ≥300 cycles), with acceptance standards referencing industry specifications developed with Qinglong's participation. As a practitioner of the mission of "creating beautiful buildings," Qinglong provides a 5-year after-sales maintenance service, using regular inspections (twice a year) and a digital management system to monitor UHPC panel displacement, cracking, and other conditions in real time, ensuring the long-term stability of the building facade.

From the 3,000㎡ UHPC curtain wall renovation of a commercial complex redevelopment project in Guangzhou, to the texture replication project of a historic building in Shanghai, Qinglong Group's 28 years of full-chain experience proves that UHPC panels are not only an ideal material for enhancing architectural aesthetics, but also a technical foundation for the sustainable renewal of existing buildings. Choosing a professional manufacturer with integrated capabilities in detailed design, production, and installation is key to ensuring the quality and efficiency of renovation projects. As embodied in Qinglong's commitment of "meticulous attention to detail and relentless pursuit of excellence," the installation of every UHPC panel represents a re-empowerment of the building's life.