Choosing Between Metallic and Non-Metallic Fibers for UHPC: Performance Comparison, Application Scenarios, and Selection Strategy Analysis

Amid the wave of innovation in building materials, Ultra-High Performance Concrete (UHPC) has become a new favorite in modern architecture thanks to its outstanding mechanical properties and durability. As the core reinforcing material of UHPC, the choice of fiber directly determines the performance and application results of the final product. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group leverages its full-chain service experience to provide an in-depth analysis of the technical characteristics of metallic and non-metallic fibers, offering scientific selection strategies for designers and owners.

The Performance Contest Between Metallic and Non-Metallic Fibers: Technical Choices Behind the Data

Metallic fibers (such as steel fibers), with their excellent tensile strength (up to over 2000MPa) and elastic modulus, have been the traditional choice for enhancing UHPC toughness. In impact load and fatigue performance tests, adding steel fibers at a 2% volume fraction can increase the flexural toughness of UHPC by 3-5 times, making them particularly suitable for structural scenarios subject to dynamic loads such as bridges and tunnels. However, their high density (7.8g/cm³) increases the self-weight of components, and they pose a risk of electrochemical corrosion in humid environments, requiring additional anti-rust treatment.

Among non-metallic fibers, basalt fiber and carbon fiber are gradually demonstrating their technical advantages. Basalt fiber has a density of only 2.8g/cm³ and excellent alkali resistance (retaining over 85% of its strength after 1,000 hours of immersion in a pH=13 solution), making it more suitable for harsh environments such as marine engineering and underground utility tunnels. Carbon fiber, with its ultra-high strength of 3000MPa and corrosion resistance, is an ideal choice for lightweight design of large-span structures, but its high cost (approximately 5-8 times that of steel fiber) limits its large-scale application. Through 28 years of engineering practice, Qinglong Group has found that in non-load-bearing components such as subway platform screen doors and landscape sculptures, adopting a composite blending technology of basalt fiber and steel fiber can extend the service life of components to over 50 years while keeping costs under control.

Scenario-Based Selection Strategy: Precise Matching Based on Project Needs

In the field of high-end public buildings, the aesthetic expressiveness and structural safety of UHPC must be considered simultaneously. Taking the renovation project of Century Plaza on Nanjing East Road as an example, when using translucent UHPC components, the Qinglong team selected ultra-fine glass fibers with a diameter of 0.15mm, ensuring a light transmittance of 30% while maintaining the flexural strength of components above 120MPa, perfectly achieving the light-and-shadow artistic effect of the building facade. In such scenarios, the lightweight and multifunctional composite advantages of non-metallic fibers stand out.

For heavy-load components in municipal engineering, such as bridge expansion joints and emergency repairs of airport runways, metallic fibers remain the first choice. In a river-crossing bridge project Qinglong participated in, UHPC formulated with hooked-end steel fibers (aspect ratio 60) achieved a 28-day compressive strength of 150MPa and flexural strength exceeding 30MPa, successfully solving the problem of cracking commonly seen in traditional concrete. Meanwhile, in breakwater construction in coastal areas, the salt spray resistance of basalt fiber (no obvious corrosion after 5,000 hours of testing) makes it an environmentally friendly alternative to traditional steel reinforcement.

Qinglong Full-Chain Services: Value Empowerment from Material Selection to Project Delivery

As a National High-Tech Enterprise and a participant in formulating UHPC industry standards, Qinglong Group has established a fiber selection database containing material performance parameters and application feedback from 200+ engineering cases. Customized solutions are provided for different customer needs: optimizing cost structures for real estate developers by recommending "metallic fiber + basalt fiber" composite formulations; providing BIM parametric design support for design institutes to ensure uniform fiber dispersion in irregularly shaped components; and providing full life-cycle assessments for government public projects, with 50-year maintenance plans developed based on durability data.

From fiber mix ratio simulation in the detailed design stage, to automated feeding control in production, and then to the quality traceability system during construction and installation, Qinglong transforms material performance into architectural value under the philosophy of "meticulousness and the pursuit of excellence". Whether it is the GRC curved curtain wall of the Dongguan Women and Children's Activity Center, or GRP landscape components exported to Australia, these all testify to the perfect combination of scientific selection and professional service. Choosing UHPC fibers is not merely a comparison of technical parameters, but a deep consideration of the project's full life-cycle value — and this is precisely the unique value that Qinglong, as an industry leader, creates for its clients.