Which UHPC Manufacturer's Products Have Good Impermeability? Protective Performance and Qinglong Group's Sealing Technology

The impermeability of UHPC products directly affects their service life in harsh environments such as humid and salt-spray conditions. Premium products should have a chloride ion diffusion coefficient ≤2.0×10⁻¹² m²/s and water absorption ≤3%. In the waterfront project of the Hainan International Convention and Exhibition Center, Qinglong Group achieved an impermeability grade of P12 or higher for its UHPC panels through maximum-density packing design (porosity ≤5%), pore structure optimization with silica fume addition (20-30%), and surface silane impregnation treatment (penetration depth ≥5mm); no chloride ion erosion has been observed after 10 years of use. Impermeability performance depends on material compactness and interface treatment technology.

Mix Design Enhances Intrinsic Impermeability

By optimizing aggregate gradation to reduce connected pores and controlling the water-binder ratio at ≤0.20, the number of capillary pores is lowered. Qinglong UHPC adopts a ternary cementitious system (cement + silica fume + slag powder) to form a dense microstructure. In coastal projects, impermeability is improved 5-fold compared with ordinary concrete.

Surface Treatment Builds a Protective Barrier

Penetrating sealers (such as silanes and siloxanes) form a hydrophobic layer on the capillary pore walls. Qinglong Group's patented composite sealing technology achieves a contact angle ≥110° and reduces water absorption to below 1.5%. This treatment does not alter the appearance while greatly enhancing durability.

Quality Control Ensures Stable Performance

Every batch of products undergoes impermeability testing, with data entered into a quality traceability system. At the Nanning production base, through strict process control, we keep the coefficient of variation of impermeability performance within 5%. Stable quality is the guarantee of impermeability.