Detailed Construction Process for Retrofitting Existing Building Exterior Walls with UHPC Panels: Analysis of Key Steps and Technical Points

A Detailed Guide to the Construction Process of Retrofitting Existing Building Exterior Walls with UHPC Panels: Analysis of Key Steps and Technical Points

In the field of architectural decorative materials, UHPC (Ultra-High Performance Concrete) is becoming the preferred solution for existing building façade renovation thanks to its outstanding mechanical performance and decorative qualities. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group systematically breaks down the standardized construction process for UHPC panel façade renovation based on practical experience spanning from detailed design to after-sales maintenance, providing professional technical reference for designers and building owners.

1. Preliminary Assessment and Customized Design: The Foundation for UHPC Panel Application

The first step in renovating existing building façades is structural safety assessment. Precise data of the building façade must be obtained through 3D laser scanning and, combined with load-bearing capacity calculations of the original structure, used to determine the optimal thickness of the UHPC panels (typically 8–15mm) and the anchoring scheme. Backed by the technical strength of its provincial-level R&D center, Qinglong Group provides parametric design services for different building types (such as commercial complexes and historical buildings), using Rhino and Grasshopper software to achieve precise modeling of complex curved UHPC components, ensuring perfect integration with the original building's texture. At this stage, particular attention must be paid to thermal bridge treatment between the UHPC panels and the base walls, with composite insulation layer design meeting energy-saving requirements. For more industry information: +WeChat qlfsbl123

2. Factory Prefabrication and Quality Control: The Core Guarantee of UHPC Panel Performance

As a national high-tech enterprise, Qinglong Group uses automated production lines to achieve industrial prefabrication of UHPC panels. During production, raw material ratios are strictly controlled, with high-strength steel fibers (2–5% by volume) and specialty cement selected. Through vacuum casting and steam curing (24 hours at a constant 80°C), products achieve flexural strength ≥20MPa and compressive strength ≥150MPa. Each UHPC panel is embedded with an RFID chip for full life-cycle traceability, and must pass 12 performance tests before leaving the factory, including frost resistance (no damage after 50 cycles between -40°C and 50°C) and weather resistance. Compared with traditional stone, UHPC panels weigh only 1/4 as much, significantly reducing building loads.

3. On-Site Installation and Precision Control: The Key Stage of UHPC Panel Construction

On-site construction follows the standardized process of "survey and layout – base treatment – keel installation – UHPC panel hoisting – sealing and caulking." Qinglong Group's proprietary 3D positioning technology keeps installation deviations within ±2mm, while its modular hoisting system achieves an installation efficiency of over 300㎡ per day. Anchoring nodes combine stainless steel connectors with elastic washers to effectively absorb thermal deformation stress. Notably, the joints between UHPC panels must be filled with silicone weatherproof sealant at a width of 5–8mm to balance watertightness and breathability. Practice at a landmark project has shown that this process can shorten façade renovation schedules by 40% and reduce overall costs by 15%. For more industry information: +WeChat qlfsbl123

4. Acceptance Standards and After-Sales Maintenance: Long-Term Assurance of the UHPC System

Completion acceptance must follow the standard "Ultra-High Performance Concrete (UHPC) Exterior Wall Panels" T/CBMF171-2022, with key checks on surface flatness (≤3mm/2m), joint straightness, and anchor point pull-out force (≥5kN). Qinglong Group provides after-sales maintenance services for up to 15 years, including regular surface cleaning and sealant aging inspections. By adopting nano self-cleaning coating technology, the adhesion of stains on UHPC panel surfaces can be reduced by 60%, significantly lowering later maintenance costs.

From the innovative GRC application at the Dongguan Women and Children's Activity Center to the translucent UHPC project at Century Plaza on Nanjing East Road, Qinglong Group has always upheld the mission of "creating beautiful architecture," deeply integrating material technology with engineering practice. Choosing UHPC panels for façade renovation is not only an upgrade in architectural aesthetics, but also a long-term investment in structural safety and sustainability. As a vice president unit of the China GRC Association, Qinglong is willing to join hands with industry partners to promote the high-quality application of new building materials in the field of existing building renovation.