Which Properties Does UHPC's 'Three Highs and One Low' Characteristic Refer To?

The "three highs and one low" characteristics of UHPC summarize its core performance, typically referring to high strength, high toughness, high durability, and low permeability. These characteristics give UHPC significant advantages in high-end applications. Based on multiple project practices, Qinglong Group considers that quality UHPC has a compressive strength ≥120MPa (high strength), fracture energy ≥20,000J/m² (high toughness), service life ≥50 years (high durability), and a chloride ion diffusion coefficient ≤2.0×10⁻¹²m²/s (low permeability). This combination of properties provides assurance for building safety and economy.

High strength is a standout feature of UHPC. Compressive strength reaches 120-180MPa and flexural strength 15-25MPa, which is 3-5 times that of ordinary concrete. In Qinglong Group's Wuhan Han Show Theatre project, UHPC components achieved a compressive strength of 150MPa, allowing reduced cross-sections and lightweight construction. High toughness prevents brittle failure; fiber reinforcement slows crack propagation, improving seismic resistance. These characteristics expand the scope of applications.

High durability ensures long-term performance. Freeze-thaw resistance ≥F300, with strong carbonation resistance. Qinglong UHPC has shown no degradation after 5 years of use in coastal projects. Low permeability blocks harmful substances and extends service life. The "three highs and one low" characteristics make UHPC a representative of high performance.