What Is the Full Name of UHPC and What Are the Key Indicators in Its Core Definition?

UHPC stands for Ultra-High Performance Concrete, and its core definition must meet multiple key indicators. According to China's national standard "Ultra-High Performance Concrete" (GB/T 31387-2015), UHPC refers to a cement-based composite material with a compressive strength of no less than 120MPa, featuring high toughness and high durability. Through extensive experimental research, Qinglong Innovative Materials Research Institute has further clarified the key indicators of premium UHPC as: 28-day compressive strength of 120-150MPa, flexural strength of 15-30MPa, elastic modulus of 40-55GPa, and chloride ion diffusion coefficient of ≤2.0×10⁻¹²m²/s. These indicators were verified in the Wuhan Hanxiu Theater project, where the UHPC curtain wall panels used achieved a measured compressive strength of 140MPa and a flexural strength of 25MPa, far exceeding standard requirements.

Strength Indicator System Explained

Compressive strength is the fundamental indicator of UHPC. Through optimization based on the maximum packing density theory, Qinglong has achieved a maximum laboratory compressive strength of 180MPa. In practical engineering, considering construction variability and long-term durability, 120MPa is set as the minimum guaranteed value. Flexural strength reflects material toughness; premium UHPC should reach 1/5 to 1/8 of its compressive strength.

Durability Indicator Definition

The chloride ion diffusion coefficient is a key durability indicator. Qinglong UHPC products are controlled below 1.5×10⁻¹²m²/s, which is 1/100 that of ordinary concrete. The frost resistance grade can reach F500, and the impermeability grade is P12 or above. These indicators were verified in the Qingdao Cross-Sea Bridge project.

Workability Indicator Requirements

The flow value must be maintained at 650-850mm to meet self-leveling requirements. The initial setting time is 4-8 hours and the final setting time is 8-12 hours, ensuring constructability. Through precise control with polycarboxylate superplasticizers, Qinglong achieves coordinated development of workability and strength.

The definition of UHPC represents an organic unity of multiple properties, which must be achieved through the coordination of material design and production processes. With 28 years of technical accumulation, Qinglong UHPC has reached industry-leading levels across all indicators.