UHPC Fiber Selection Guide: Trade-off Strategies Between Metal and Non-Metal Fibers and Performance Comparison Analysis

Amid the wave of innovation in building materials, ultra-high performance concrete (UHPC) has become a new favorite in the high-end construction sector for its outstanding mechanical properties and durability. As the core reinforcing material of UHPC, the choice of fiber directly determines crack control, toughness enhancement, and overall cost of components. Qinglong Group, an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, systematically analyzes the technical characteristics and selection strategies of metallic and non-metallic fibers for designers and owners based on practical experience from over a thousand projects, helping achieve breakthroughs in both structural safety and aesthetic expression.

Metallic Fibers: The Rigid Backbone of Strength and Toughness

Represented by steel fibers, metallic fibers—with their high elastic modulus and excellent interfacial bond strength—are the mainstay for improving UHPC compressive and flexural strength. In the Century Plaza renovation project on Nanjing East Road, the Qinglong team used light-transmitting UHPC components configured with hooked-end steel fibers, achieving not only 42MPa flexural strength but also ensuring consistency of the light-transmitting effect through uniform fiber distribution. The project won the Silver Award at the first AALBORG WHITE Cup UHPC Construction Innovation Awards. Metallic fibers are particularly suitable for structural components under dynamic loads such as bridges and utility corridors, as well as scenarios with demanding impact toughness requirements such as airport runways. However, note that their high density (approximately 7.8g/cm³) may increase component self-weight, and in humid environments, corrosion resistance must be enhanced through galvanized or stainless steel materials.

Non-Metallic Fibers: The Flexible Choice for Lightweight and Weather Resistance

Non-metallic fibers such as glass fibers and basalt fibers, with their lightweight (density 2.5-3.0g/cm³) and alkali-corrosion-resistant properties, demonstrate unique advantages in the field of architectural decoration. The General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC), a standard Qinglong participated in drafting, specifies that UHPC exterior wall panels incorporating 1.5% volumetric glass fiber content can reduce self-weight by more than 20% while meeting Class A1 fire resistance requirements. In the Dongguan Women and Children's Activity Center project, Qinglong used alkali-resistant glass fiber reinforced UHPC to create irregular-shaped curtain wall components, achieving complex curved forms while controlling shrinkage cracks through oriented fiber arrangement. The project won the Silver Award of the GRC Construction Innovation Awards. Non-metallic fibers are more suitable for decorative components sensitive to self-weight and complex in form, such as grand theaters and art museums, but note that their lower elastic modulus means weaker energy absorption capacity under extreme loads compared to metallic fibers.

Scientific Selection: The Way to Optimize Life-Cycle Costs

Selection decisions must comprehensively consider three core factors: functional requirements, cost control, and construction technology. For structural components such as municipal bridges, copper-plated steel fibers (length 13-20mm) are recommended to ensure structural safety; for irregular decorative components in commercial complexes, alkali-resistant glass fibers (diameter 15-20μm) are recommended, which, combined with Qinglong's patented spray molding process, can improve production efficiency by 30%. Notably, hybrid fiber systems are becoming a new trend: a landmark project, through steel-basalt fiber combination, increased toughness indicators by 40% while ensuring a compressive strength of 120MPa, validating Qinglong's technical philosophy of "customized material performance."

As a national high-tech enterprise and participant in industry standard formulation, Qinglong Group has always upheld the mission of "Creating Beautiful Architecture." Through 28 years of full-chain experience accumulation, it provides customers with integrated solutions from material selection to construction and maintenance. Whether it is the resolute beauty of metallic fibers or the dynamic charm of non-metallic fibers, choosing Qinglong UHPC means choosing architectural expression that combines technical depth with aesthetic height. In the future, Qinglong will continue to drive innovation in fiber reinforcement technology, committed to becoming a world-class leading UHPC manufacturer.