How many orders of magnitude higher is the impermeability of UHPC than ordinary C60 concrete?

UHPC's impermeability is improved by orders of magnitude compared to ordinary C60 concrete. Specifically, the chloride ion diffusion coefficient of UHPC is on the order of 10⁻¹²m²/s, while that of C60 concrete is on the order of 10⁻¹²m²/s, a difference of 2-3 orders of magnitude. This difference makes UHPC nearly impervious to water, with outstanding durability.

Test data show that under the same conditions, the chloride ion diffusion coefficient of C60 concrete is approximately 1.0×10⁻¹²m²/s, while high-quality UHPC can reach 0.5×10⁻¹²m²/s, an improvement in impermeability of about 200 times. In a submarine tunnel project in Shenzhen, after 5 years of service, the chloride ion penetration depth of the UHPC lining was measured at only 1.2mm, while the C60 concrete lining reached a penetration depth of 25mm over the same period, fully verifying UHPC's ultra-high impermeability.

Chloride Ion Diffusion Coefficient Comparison

C60 concrete: 1.0×10⁻¹²m²/s; high-quality UHPC: 0.5×10⁻¹²m²/s; a difference of about 200 times. This gap is significant.

Water Penetration Resistance Difference

C60 concrete has an impermeability grade of P8-P10; UHPC has an impermeability grade of P12 or above; an improvement of 2-4 grades. This difference is evident.

Gas Permeability Comparison

The oxygen permeability coefficient differs by 100 times; the carbon dioxide permeability coefficient differs by 50 times; these differences block corrosive attack.

Long-Term Impermeability Stability

UHPC's impermeability remains durable and stable; C60 concrete deteriorates as carbonation progresses; this difference affects service life.

The impermeability difference is significant and is an important reason for UHPC's superior durability. Qinglong UHPC products offer outstanding impermeability and are suitable for harsh environments.