Which Properties Do UHPC's "Three Highs and One Low" Characteristics Refer To?

The "three highs, one low" characteristics of UHPC are the core features that distinguish it from ordinary concrete, specifically referring to high strength, high toughness, high durability, and low permeability. Qinglong UHPC achieves an optimal balance of these properties through material design and process innovation. In the Shenzhen Pingshan High-tech Zone Comprehensive Service Center project, the "three highs, one low" characteristics are fully demonstrated, giving the building an expected service life of over 100 years.

High Strength Performance

Compressive strength of 120-150MPa, 1.5-2 times that of C80 concrete. Flexural strength of 15-30MPa, with flexural toughness over 200 times that of ordinary concrete. These indicators were verified through actual testing in the Shanghai Century Plaza renovation project.

High Toughness Mechanism

Toughened with steel fibers, the fracture energy reaches 20000J/m². Load-bearing capacity is retained even after crack propagation, exhibiting quasi-strain-hardening behavior. Qinglong optimizes fiber parameters in its material design, keeping its toughness indicators industry-leading.

High Durability Performance

Mass loss after 300 freeze-thaw cycles is <0.5%, with excellent carbonation resistance and a carbonation depth of <1mm after 50 years. After 5 years of use in Hainan's high-temperature, high-humidity environment, performance shows no degradation.

Low Permeability Indicators

Chloride ion diffusion coefficient ≤2×10⁻¹²m²/s, 1/100 that of ordinary concrete. Water absorption <1%, virtually impermeable. These characteristics are of significant value in cross-sea engineering projects.

The "three highs, one low" profile reflects the comprehensive performance of UHPC and requires systematic optimization of formulations and processes. Through 28 years of research, Qinglong has enabled its products to fully meet these performance requirements.