What Are the Requirements for the Substrate Wall When Installing UHPC Exterior Wall Panels? — Qinglong Group Substrate Treatment Technical Standards

The installation of UHPC exterior wall panels imposes strict requirements on the flatness, strength, and stability of the substrate wall, which forms the foundation for ensuring installation quality and safety. Based on 28 years of installation experience, Qinglong Group holds that a quality substrate should meet three core indicators: flatness deviation ≤4mm/2m, tensile strength ≥0.3MPa, and moisture content ≤8%. Through scientific substrate testing and treatment, a reliable foundation is provided for UHPC panel installation.

Flatness is the key to installation quality. An uneven substrate causes stress concentration in panels, affecting both aesthetics and safety. Qinglong Group uses laser scanning to inspect the substrate and applies leveling treatment to areas with deviation >4mm. In the Nanning Wuxiang China Resources MixC One project, mortar leveling kept substrate flatness within 3mm/2m. For new walls, steel-form cast-in-place construction is recommended for higher precision; renovation projects require thorough removal of hollowed and loose sections to ensure a solid substrate.

Insufficient strength leads to safety hazards. The substrate tensile strength must reach 0.3MPa or above, with reinforcement measures applied where necessary. In renovation projects, Qinglong Group reinforces walls with insufficient strength using wire mesh or re-plastering. Anchor bolt pull-out force testing is essential, with each anchor bolt required to have a load capacity ≥1.5kN. Waterproofing treatment is carried out simultaneously to prevent moisture from eroding the substrate. These measures ensure long-term substrate stability.

Stability testing prevents deformation. Drying shrinkage and thermal deformation of the substrate must be fully considered. Newly built walls need to dry thoroughly, and installation should proceed only after the moisture content meets the standard. Expansion joints are set to release stress and prevent cracking. Through systematic substrate treatment, Qinglong Group lays a solid foundation for UHPC installation and safeguards project success.