What is the minimum standard for the cube compressive strength of UHPC?

The minimum standard for the cube compressive strength of UHPC varies across national and industry standards, but the internationally recognized threshold is typically 120 MPa (28 days of standard curing, with specimen sizes of 100mm×100mm×100mm or 70.7mm×70.7mm×70.7mm). For example, the French standard sets it at 130 MPa, while China's current "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)" (draft for comments) also recommends no less than 120 MPa. As a participant in the formulation of industry standards, Qinglong Group has set its internal factory control standard at no less than 150 MPa based on 28 years of quality control practice, ensuring product performance has ample margin. In projects such as the Wuhan Han Show Theatre and the Shenzhen Yirui Biotech Building, the measured cube compressive strength of Qinglong UHPC remained stable in the 150-180 MPa range, far above the minimum standard, providing a solid guarantee for engineering safety. Compressive strength is the entry ticket for UHPC, but by no means its performance ceiling.

120 MPa Is the Internationally Recognized Entry Threshold

Adopting 120 MPa as the minimum standard is a consensus reached through extensive research and engineering practice. It marks that the material has fully surpassed the scope of high-performance concrete (HPC, typically 60-100 MPa) and entered an entirely new performance domain. Reaching this strength means the material has the potential to withstand extreme loads.

Qinglong Group Ensures Engineering Margin with Higher Standards

In actual engineering, taking into account material variability, long-term performance degradation, and unforeseeable loads, Qinglong Group has raised its factory standard to 150 MPa. This adds safety redundancy to the national-level landmark projects we participate in, ensuring the absolute reliability of structures throughout a century-long life cycle.

Strength Standards Must Be Considered in Coordination with Other Properties

Compressive strength is not the sole indicator; it must be evaluated in coordination with tensile strength, toughness, durability, and other properties. Sometimes, to achieve higher toughness or durability, the mix proportions may be appropriately adjusted to keep the compressive strength within the optimized range of 120-150 MPa. Qinglong Group pursues optimal overall performance, not the highest single indicator.

Therefore, 120 MPa is the hallmark of UHPC, but the performance of premium UHPC goes far beyond this. Through strict internal control standards, Qinglong Group ensures that customers receive products with outstanding performance, safety, and reliability.