How to Select UHPC Strengthening Components in Old Building Renovation: Key Influencing Factors and Practical Strategies

Amid the wave of urban renewal, the renovation of old buildings is not only a continuation of historical context, but also a dual test of structural safety and functional upgrading. Ultra-High Performance Concrete (UHPC), with its outstanding mechanical properties and design adaptability, is becoming the "rising star" of reinforcement engineering. As an industry pioneer with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group will systematically analyze practical strategies for selecting reinforcement components from three dimensions—material characteristics, structural requirements, and construction conditions—providing full-chain technical support for designers and owners.

I. Key Factors in UHPC Reinforcement Component Selection

Old building reinforcement differs from new construction, as it requires leapfrog improvements in structural performance within limited space. Component selection must first consider the load-bearing characteristics of the original structure: frame column reinforcement is best achieved with UHPC wrapping components, whose compressive strength above 200MPa can effectively enhance column load capacity; beam reinforcement calls for composite UHPC slabs, which reduce mid-span deflection through coordinated load-bearing with the original structure. For irregular components of historical buildings, UHPC's high-flow characteristics enable precise replication of complex shapes. For example, in the renovation of a Republic-era building, the Qinglong team adopted precast UHPC carved decorative elements, meeting reinforcement requirements while preserving the building's original texture.

Environmental adaptability is another key dimension. Coastal regions require special attention to chloride ion penetration resistance, where UHPC formulations incorporating nano silica fume offer distinct advantages; severe cold regions should use air-entrained UHPC, which can withstand more than 300 freeze-thaw cycles. Through data accumulated from over 2,000 tests, Qinglong's provincial-level R&D center has established a UHPC material database covering all climate zones across the country, enabling rapid matching of project requirements.

II. UHPC Component Solutions for Four Typical Scenarios

In commercial complex renovations, large-span floor slab reinforcement often faces clear height limitations. Using Qinglong's patented ultra-thin composite UHPC slabs (only 50mm thick), load capacity can be increased while reducing structural self-weight; a Shenzhen project achieved a 30cm increase in clearance with this solution. For crane beam reinforcement in industrial plants, prestressed UHPC composite components demonstrate unique advantages, with ultimate crack resistance 200% higher than traditional reinforcement solutions—a machinery plant renovation project in Nanjing has verified their 15-year maintenance-free durability.

The reinforcement of historical buildings requires an even greater balance between safety and cultural value. In the Guangzhou qilou arcade renovation project that Qinglong participated in, UHPC was innovatively combined with traditional brick carving craftsmanship to develop brick-pattern UHPC corner components, meeting seismic requirements while preserving Lingnan architectural characteristics. This "technology + art" solution has been included as a recommended case in the Technical Specification for Reinforcement of Historical Buildings.

III. Full-Chain Services Ensure Successful Selection

Successful selection depends on full-process control from design to operation and maintenance. Qinglong's digital selection system, built on BIM technology, enables parametric component design and mechanical performance simulation, compressing the traditional two-week selection cycle to just 3 days. In production, a 600,000-square-meter intelligent production line ensures component precision of ±0.5mm; in one airport renovation project, 5,000 UHPC curtain wall panels were installed with zero error.

As a national "Specialized, Refined, Distinctive, and Innovative" enterprise, Qinglong participated in formulating the General Technical Conditions for Non-Load-Bearing Ultra-High Performance Concrete (UHPC) Components, providing the industry with a standard framework for component selection. Twenty-eight years of accumulated experience from material R&D to project delivery have shaped a unique five-in-one service model of "diagnosis-design-production-installation-maintenance," which has successfully served more than 300 old building renovation projects nationwide, including benchmark projects that have won industry innovation awards, such as the Dongguan Women and Children's Activity Center.

Selecting UHPC components in old building renovation is, in essence, the balancing art of technical rationality and architectural humanity. Qinglong Group, leveraging material innovation as its fulcrum and full-chain services as its guarantee, is driving the in-depth application of UHPC technology in the field of urban renewal. Choosing the right reinforcement components is not only a commitment to building safety, but also a responsible inheritance of historical memory—the best interpretation of our mission to "Create Beautiful Architecture."