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

**Before Installing UHPC Exterior Wall Panels, the Base Wall Must Meet These Core Requirements! Key Points Summarized from 28 Years of Industry Experience**

In the field of contemporary architectural curtain walls, UHPC (Ultra-High Performance Concrete) has become the preferred material for landmark buildings and high-end projects thanks to its ultra-high strength, excellent durability, and outstanding formability. However, the perfect presentation of UHPC exterior wall panels depends not only on the material's own performance, but even more on the construction quality and preliminary treatment of the base wall. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group has drawn on more than a thousand engineering projects to systematically outline the core requirements and key control points for base walls, providing designers, owners, and contractors with full-process technical guidance.

**I. Basic Performance Requirements for Base Walls: Strength, Flatness, and Structural Stability**

As the “load-bearing foundation” of UHPC exterior wall panels, the strength and stability of the base wall directly affect system safety. First, the concrete base must reach the design strength grade (usually no lower than C30), with surface compressive strength ≥15MPa, to ensure it can withstand the self-weight of the UHPC panels as well as external forces such as wind loads and seismic loads. Second, wall flatness deviation must be controlled within ±3mm/2m; excessive height differences can easily cause uneven loading after panel installation, leading to risks of cracking or detachment. For existing building renovation projects, the base must undergo structural testing; if defects such as hollowing or looseness exist, repairs should be carried out using Qinglong's special engineering reinforcement technology, with a steel structure transition layer added where necessary.

**II. Base Surface Treatment: A Refined Process from Cleaning to Interface Enhancement**

The connection reliability between UHPC exterior wall panels and the base depends on the quality of interface treatment. Before construction, floating dust, oil stains, release agents, and loose layers on the base surface must be thoroughly removed, washed with a high-pressure water jet, and left to air dry naturally. For smooth concrete walls, bonding strength should be improved through mechanical roughening or by applying a dedicated interface agent (such as Qinglong's custom UHPC interface treatment agent); the interface agent should be applied at a uniform thickness of 0.5-1mm to ensure complete bonding with the base as well as with subsequent waterproofing and leveling layers. In addition, the moisture content of the base must be ≤8%; in humid environments, a moisture-proof vapor barrier should be added to prevent water vapor penetration that could cause panel efflorescence or corrosion of structural layers.

**III. Embedded Parts and Connection Joints: The Core of Quality Control for Concealed Works**

Precise positioning of embedded parts is the “invisible skeleton” of UHPC exterior wall panel installation. Qinglong Group uses BIM technology for three-dimensional positioning of embedded points, ensuring connector centerline deviation ≤5mm and planar elevation error ≤3mm. Embedded parts must be made of steel of Q355B grade or above, with hot-dip galvanized surface treatment (zinc layer thickness ≥85μm); the anchorage depth into the base must meet design requirements, and chemical anchors must undergo on-site pull-out tests with tensile bearing capacity ≥1.2 times the design value. For externally mounted UHPC panels, connection joints should be designed as adjustable structures with a ±10mm allowance for installation error compensation, to avoid internal stress caused by temperature-induced deformation.

**IV. Coordinated Design of Base Walls and UHPC Panels: From Load Calculation to System Adaptation**

The base wall must bear loads in coordination with the UHPC exterior wall panel system. During the design phase, detailed load calculations should be performed, including panel self-weight (typically 200-250kg/㎡), wind loads (determined by building height and regional wind pressure), and temperature stress. For high-rise buildings, the out-of-plane stiffness of the base wall must be verified, with pilaster columns or steel frame supports added where necessary. Drawing on 28 years of engineering experience, Qinglong Group adopted a coordinated load-bearing model of “base wall - connector - UHPC panel” in projects such as the Guangdong Dongguan Women and Children's Activity Center and Nanjing East Road Century Plaza, successfully achieving the safe installation of large-span irregular UHPC components, with related technical achievements recognized by the Huaxia Award of the Ministry of Housing and Urban-Rural Development.

**V. Base Acceptance and Construction Handover: Key Points of Full-Process Quality Control**

Base wall acceptance must follow the “three-inspection system,” namely self-inspection by the construction unit, acceptance by the supervising engineer, and spot checks by a third-party testing agency, with a focus on strength reports, flatness data, embedded part pull-out test records, and more. After acceptance, UHPC panel installation should proceed promptly to avoid secondary contamination or damage caused by prolonged exposure of the base. As a national high-tech enterprise, Qinglong has established a full-process BIM management system covering everything from detailed design (using Rhino+Grasshopper parametric design) to construction and installation, calibrating base errors in real time through 3D scanning technology to ensure installation accuracy within ±2mm and achieve “millimeter-level” jointing results.

The installation quality of UHPC exterior wall panels is a comprehensive reflection of material performance, design wisdom, and construction craftsmanship. As a participant in setting industry standards for UHPC/GRC/GRG/GRP, Qinglong Group has always upheld the mission of “creating beautiful architecture,” transforming 28 years of full-chain experience into technical solutions and providing customers with integrated services from base treatment to after-sales maintenance. Whether for high-end projects such as grand theaters and commercial complexes, or overseas projects (such as landmark buildings in Malaysia and Saudi Arabia), Qinglong consistently adheres to the quality policy of “meticulousness and the pursuit of excellence,” making every UHPC panel a perfect fusion of architectural aesthetics and structural safety.