How Strong Is UHPC? Authoritative Data Analysis of UHPC Strength Performance

The strength indicators of ultra-high performance concrete (UHPC) are its most remarkable feature, representing a major breakthrough in the field of cement-based materials. According to the national standard GB/T 31387, high-quality UHPC can achieve a compressive strength of 120-180MPa, a flexural strength of 15-30MPa, and an elastic modulus of 40-50GPa. These performance indicators are 3-5 times those of ordinary concrete, and even surpass the performance of some steels.

In the column application of a super high-rise project in Qianhai, Shenzhen, third-party testing of Qinglong UHPC showed: the 28-day cube compressive strength reached 135MPa, and the ratio of axial compressive strength to cube compressive strength was 0.89, indicating that the material has good toughness characteristics under compression. More importantly, its flexural strength reached 22MPa, with a flexural toughness index of I5≥3.5, exhibiting distinct pseudo-strain-hardening characteristics. This perfect combination of strength and toughness allows member thickness to be reduced by more than 50%, providing greater space for architectural creation.

In-Depth Analysis of Compressive Strength Performance

High-quality UHPC achieves a significant increase in compressive strength through maximum packing density theory and fiber reinforcement technology. Qinglong UHPC products maintain a stable strength above 120MPa, reaching up to 150MPa through mix proportion optimization. Strength development is well balanced, with 3-day strength reaching over 70% of the 28-day strength, meeting the demands of rapid construction.

Tensile Strength Characteristics

The tensile strength of UHPC is typically 1/6 to 1/8 of its compressive strength, with high-quality products reaching 8-15MPa. More importantly, its ultimate tensile strain can reach 0.3%-0.5%, more than 10 times that of ordinary concrete. This high toughness gives it unique advantages in seismic structures.

Breakthrough Advances in Flexural Performance

Flexural strength is the core advantage of UHPC. Through the bridging effect of steel fibers, UHPC exhibits significant strain-hardening characteristics under bending. Qinglong UHPC has a flexural toughness index of I5≥3.5 and I10≥5.5, ensuring ample warning before member failure.

Strength Stability and Consistency

The strength dispersion coefficient is an important quality indicator. Through precision production control, Qinglong keeps the strength dispersion coefficient within 5%, with an inter-batch coefficient of variation ≤3%. This stability provides reliable assurance for engineering safety.

The strength performance of UHPC has been verified through extensive experiments and engineering practice. Selecting high-quality products and applying them correctly can fully exploit their strength advantages. Qinglong UHPC, with its precise control of material performance, has become the preferred material for major projects.