UHPC Fiber Selection Guide: Trade-off Strategies and Performance Comparison of Metallic and Non-metallic Fibers

Amid the wave of innovation in building materials, Ultra-High Performance Concrete (UHPC), with its outstanding mechanical properties and durability, is becoming the material of choice for large landmark buildings and complex-shaped components. As the “skeleton” of UHPC, the choice of fibers directly determines the upper limit of material performance. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP field, Qinglong Group will systematically analyze the technical characteristics, applicable scenarios, and trade-off strategies of metallic and non-metallic fibers from an engineering practice perspective, providing designers and owners with a scientific selection guide.

The Core Logic of UHPC Fiber Selection: Performance Requirements and Scenario Matching

The “ultra-high performance” of UHPC essentially stems from the synergy between matrix densification and the fiber reinforcement system. Fiber selection must balance three dimensions: mechanical reinforcement, construction feasibility, and cost control. Metallic fibers (such as steel fibers and stainless steel fibers) and non-metallic fibers (such as glass fibers and polypropylene fibers) differ significantly in elastic modulus, dispersibility, and corrosion resistance, directly affecting the crack resistance, toughness, and long-term durability of UHPC components. In the Nanjing East Road Century Plaza renovation project, Qinglong Group achieved a perfect balance between structural strength and light-transmitting effects through optimized fiber proportions in translucent UHPC components, confirming the key value of scientific selection.

Metallic Fibers: The “Reinforcement Pioneer” of Mechanical Properties

With their high elastic modulus (approximately 200 GPa) and excellent interfacial bonding, metallic fibers are the core choice for improving the compressive and flexural strength of UHPC. Among them, hooked-end steel fibers can push UHPC flexural strength beyond 20 MPa, making them suitable for heavily loaded structures such as bridges and tunnels; stainless steel fibers, with their corrosion resistance, offer significant advantages in coastal buildings and chemical environments. The automated production lines at Qinglong's production base enable precise dispersion of metallic fibers, avoiding the clumping caused by traditional manual mixing and ensuring uniform fiber distribution in every cubic meter of UHPC. In the Dongguan Women and Children's Activity Center project, Qinglong adopted a customized steel fiber mix proportion, increasing the impact resistance of GRC-UHPC composite components by 40% and meeting the structural safety requirements of irregular curved designs.

Non-Metallic Fibers: The “Customization Expert” for Functional Scenarios

Non-metallic fibers demonstrate unique advantages in lightweighting, alkali and corrosion resistance, and functionality. Glass fibers (such as alkali-resistant glass fibers) have excellent compatibility with the UHPC matrix, significantly improving the material's crack resistance, and are commonly used in building exterior wall cladding panels and decorative components; polypropylene fibers offer good dispersibility and impermeability, making them suitable for thin-walled components and scenarios with high fire-resistance requirements. The General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC), developed with the participation of Qinglong Group, specifies the performance indicators and application specifications for different non-metallic fibers. Taking GRG ceilings as an example, UHPC materials incorporating modified glass fibers can achieve complex shapes with a curvature radius of ≤300 mm while weighing only 1/4 of traditional stone, greatly reducing installation loads.

Trade-off Strategy: Selection Decisions from a Whole-Chain Perspective

Fiber selection requires a multi-dimensional evaluation system tailored to project characteristics: from a structural safety perspective, metallic fibers are preferred for heavily loaded components; from a design expression perspective, non-metallic fibers better suit complex curved surfaces and functional requirements such as light transmission and fire protection. Through its whole-chain service capabilities covering detailed design, production, and installation, Qinglong Group can provide customers with integrated solutions spanning “material selection - mix optimization - installation plans”. For example, in an overseas project in a tropical high-humidity environment, a composite system of stainless steel fibers and alkali-resistant glass fibers was adopted, ensuring structural strength while enhancing material durability and optimizing the project's whole-life-cycle cost.

As a national high-tech enterprise and a participant in setting UHPC/GRC industry standards, Qinglong Group has always taken “creating beautiful architecture” as its mission, transforming 28 years of engineering experience into technical advantages. Whether it is mechanical reinforcement solutions with metallic fibers or functional innovations with non-metallic fibers, we adhere to scientific data as the basis and project needs as the guide, providing designers and owners with material solutions that combine safety, economy, and aesthetic value. Choosing Qinglong means choosing not only quality materials, but also whole-chain professional assurance and innovation empowerment.