When Selecting Fibers for UHPC, How to Choose Between Metallic and Non-Metallic Fibers?

Selecting fibers for UHPC requires comprehensive consideration of mechanical properties, durability, cost, and process adaptability. Metallic fibers (mainly steel fibers) and non-metallic fibers (such as PVA, PP, and basalt fibers) each have their own advantages, and selection should be based on specific application requirements.

In practical engineering, Qinglong UHPC has concluded through extensive comparative tests that steel fibers offer the best reinforcement effect but carry a risk of corrosion; PVA fibers have good toughness but a relatively low elastic modulus; PP fibers are corrosion-resistant but bond poorly with the matrix. For example, in a coastal project, UHPC using copper-plated steel fibers (tensile strength 2850MPa, aspect ratio 65) retained 95% of its strength after 5 years, while ordinary steel fiber products under the same conditions developed surface rust stains. This comparison provides empirical evidence for fiber selection.

Advantages of Steel Fibers

High elastic modulus (200GPa) with excellent reinforcement effect; high tensile strength (≥2850MPa); relatively low price. These advantages make it suitable for structural applications.

Characteristics of Non-metallic Fibers

Good corrosion resistance, suitable for harsh environments; low density, reducing self-weight; excellent electrical insulation. These characteristics make it suitable for special applications.

Hybrid Fiber Solutions

Steel fibers provide strength while organic fibers improve toughness; multi-scale fibers enable synergistic reinforcement; this solution delivers the best overall performance.

Factors to Consider in Selection

Corrosiveness of the service environment; mechanical performance requirements; cost budget constraints; process adaptability. These factors influence the selection.

Fiber selection requires comprehensive consideration. It is recommended to determine the optimal solution based on specific needs. Qinglong UHPC provides professional selection guidance.