Analysis of Specific Base Wall Requirements and Technical Key Points for UHPC Exterior Wall Panel Installation

In the field of contemporary architectural decoration, UHPC exterior wall panels, with their outstanding mechanical performance and aesthetic expressiveness, are becoming the preferred material for high-end building envelopes. However, the quality of their installation depends directly on the pre-treatment level of the base wall. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the decisive role of base wall treatment in system safety and durability. This article systematically analyzes the technical requirements of UHPC exterior wall panel installation for the base wall, providing professional guidance for designers and contractors.

1. Structural Strength and Flatness Control of the Base Wall

UHPC exterior wall panel installation first requires the base wall to have sufficient load-bearing capacity. According to the T/CBMF171-2022 standard “Ultra-High Performance Concrete (UHPC) Exterior Wall Panels”, the compressive strength of the base wall should be no less than 15MPa, and the surface flatness deviation must be controlled within 3mm/2m. Laboratory data from Qinglong Group's Nanning production base show that when using a laser leveler for base inspection, no fewer than 5 test points must be set per 200 square meters to ensure that the actual concrete strength at anchorage points meets the standard. For existing building renovation projects, core drilling sampling is recommended to test the base strength, with rebar planting reinforcement applied when necessary.

2. Key Technical Points of Base Surface Treatment

The cleanliness of the base wall directly affects the bonding performance of UHPC panels. Before construction, surface dust, oil stains, and loose layers must be thoroughly removed, and the surface should be washed with a high-pressure water gun and left to air dry naturally. The Qinglong technical team especially emphasizes that for moisture-sensitive areas (such as basements or rainy regions), the moisture content of the base must be controlled below 8%, which can be checked at multiple points with an infrared moisture meter. When defects such as honeycombing and pitted surfaces exist on the base, special repair mortar should be used for leveling; when the repair thickness exceeds 10mm, layered application is required, with each layer cured for no less than 72 hours.

3. Precise Positioning of Embedded Parts and Connection Joints

As a manufacturer of customized UHPC products, Qinglong Group adopts BIM technology for embedded part positioning from the detailed design stage. The positional deviation of embedded parts in the base wall should be ≤5mm, and the planar elevation error should be controlled within ±3mm. For steel structure bases, hot-dip galvanizing treatment and anti-rust primer coating are required; for concrete bases, post-installed undercut mechanical anchors should be used with an anchorage depth of no less than 10d (d being the bolt diameter). In a commercial complex project in Guangzhou, Qinglong achieved embedded part positioning errors of ≤2mm through 3D scanning technology, ensuring the perfect splicing of the UHPC curtain wall.

4. Coordinated Waterproofing and Insulation Treatment of the Base Wall

The UHPC exterior wall panel system needs to work effectively in coordination with base waterproofing. Qinglong recommends applying polymer cement-based waterproof coating on the base surface with a dry film thickness of ≥1.5mm, with particular reinforcement at leak-prone areas such as window sills and overhanging eaves. When integrated insulation design is adopted, the bonding strength between the base and the insulation layer should be ≥0.3MPa, and a breathable structural layer must be provided to prevent condensation accumulation. In the weathering laboratory of the Nanning production base, the composite wall system tested through 1000 freeze-thaw cycles showed an insulation performance decay rate below 5%, verifying the critical role of base treatment.

As the foundational work of UHPC exterior wall panel installation, base wall treatment embodies the industry rule of “70% preparation, 30% installation”. With 28 years of detailed design and construction experience, Qinglong Group has established a full-process standard system from base inspection and treatment to acceptance. The industry standard “General Technical Conditions for Non-Load-Bearing Ultra-High Performance Concrete (UHPC) Components”, which it helped formulate, has become an important basis for regulating base treatment. For owners and designers pursuing building quality, choosing a UHPC manufacturer with full-chain service capability is the key to ensuring project success.