Why UHPC's Shear Performance Advantages Are Difficult to Reflect in Design: Cause Analysis and Solution Approaches

Amid the wave of innovation in building materials, ultra-high performance concrete (UHPC) has been hailed as the "rising star of the building materials world" for its outstanding mechanical properties. Its shear strength in particular can reach 5-8 times that of ordinary concrete. However, this technical advantage often receives critical acclaim but fails to gain traction in actual engineering design, becoming an industry pain point. As an industry player with 28 years of deep engagement in UHPC/GRC/GRG/GRP materials, Qinglong Group will analyze the underlying causes of this contradiction from three dimensions—technical bottlenecks, standards systems, and application scenarios—and propose pathways to break the deadlock based on its full-chain service experience.

**The "On-Paper Advantages" of UHPC Shear Performance: Three Real-World Obstacles**

The cognitive gap on the design side regarding UHPC material characteristics constitutes the first obstacle. Most building designs still follow the design mindset of traditional concrete and fail to fully leverage UHPC's high-toughness characteristics. In one landmark project, although the designers selected UHPC curtain wall panels, they still calculated anchoring spacing using shear formulas for ordinary concrete, resulting in material performance utilization below 60%. This "using an old map to find new roads" design approach has led to a serious underestimation of UHPC's shear potential.

The lag of the standards system further constrains technology transformation. The industry currently lacks specialized specifications for UHPC shear design; in the current Code for Design of Concrete Structures, provisions on UHPC shear calculation remain at the trial stage. The industry standard General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC) (Plan No. 2024-0232T-JC), drafted with the participation of Qinglong Group, is filling this gap, but implementation of the standard and designers' acceptance still need time to mature.

Misjudgment of economics has become an invisible barrier to market promotion. Although the unit price of UHPC material is higher than that of ordinary concrete, optimized cross-section design can reduce material usage by more than 30%. Take the cantilevered eave components of a commercial complex as an example: although the UHPC solution increased material costs by 15%, the 40% reduction in self-weight saved 22% on foundation costs, so full-cycle costs actually fell by 7%. This cognitive bias of "visible costs masking hidden benefits" makes many owners hesitate at the decision-making stage.

**From Laboratory to Construction Site: Qinglong's Full-Chain Practices for Breaking the Deadlock**

Solving the application dilemma of UHPC shear performance requires coordinated efforts at three levels: design optimization, technology integration, and case verification. During the detailed design stage, Qinglong Group used parametric design tools (Rhino+Grasshopper) to build digital models of shear performance and verified joint details through 1:1 physical testing. In the Nanjing East Road Century Plaza renovation project, light-transmitting UHPC components achieved a shear load-bearing capacity of 1.3 times the design value through optimized reinforcement, while meeting a 30% weight reduction target; the project won the Silver Award at the first AALBORG WHITE Cup UHPC Construction Engineering Innovation Awards.

Process innovation in manufacturing is equally critical. The fully automatic material distribution system introduced at Qinglong's Guangxi production base enables directional fiber distribution, keeping the standard deviation of the shear strength of UHPC components within 5%. For complex curved components, 3D scanning and compression molding technologies are used to ensure that the dispersion of shear performance in each batch is 60% lower than the industry average. This "digital design + precision manufacturing" model provides process assurance for stable shear performance.

**Building a New Ecosystem for UHPC Applications: Joint Standards Development and Value Reconstruction**

Advancing the engineering application of UHPC shear performance also requires industry-wide collaboration to build a new value evaluation system. As Vice Chairman Unit of the China GRC Association and Chairman Unit of the Guangdong Fiber Composite Materials Industry Association, Qinglong is joining forces with universities and design institutes to build an "UHPC Shear Performance Database," which has already collected 120 sets of measured data covering different mix proportions and processes. Meanwhile, through formats such as "designer salons," Qinglong shares the collaborative shear design experience of GRC and UHPC composite components from the Dongguan Women and Children's Activity Center (new campus site) project, which won the Silver Award at the first GRC Construction Engineering Innovation Awards.

Only when the industry shifts from "material performance worship" to "systematic value creation" can UHPC's shear advantages truly take root. As advocated by Qinglong Group's mission of "Creating Beautiful Architecture," the value of new building materials lies not only in breakthroughs in laboratory data, but also in converting technical advantages into the dual empowerment of building safety and aesthetics through full-chain service capabilities. As the standards system improves and application experience accumulates, UHPC will ultimately achieve the leap from "technical advantage" to "engineering value" in the field of shear design, injecting more possibilities into architectural creation.