UHPC Component Dimensional Deviation Control Standards: Industry Norms and Practices in Precision Control

Dimensional deviation is a core indicator for measuring the quality of UHPC components, and precise dimensional control directly affects installation and jointing results as well as the overall aesthetics of a building. Qinglong Group, a national high-tech enterprise with 28 years of deep industry experience, has drawn on the industry standards it helped formulate and over a thousand engineering projects to summarize the core standards and implementation paths for dimensional deviation control of UHPC components.

I. Core Dimensional Deviation Control Standards????

Dimensional deviation control of UHPC components follows industry specifications such as the General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC), with clearly defined core indicators. For flat panel components, the allowable deviation for length and width ranges from ±2mm to ±5mm, and thickness deviation from ±1mm to ±3mm; for special-shaped components (such as L-shaped and U-shaped panels), angular deviation must not exceed ±0.5°, and curvature deviation must not exceed 2mm per meter. Qinglong Group implements even stricter internal control standards, keeping the dimensional deviation of flat panel components within ±2mm. In the Shanghai New World Nanjing East Road Century Plaza project, the dimensional deviation of a 12-square-meter extra-large UHPC component was precisely controlled within ±1.5mm, ensuring seamless jointing. In addition, flatness deviation of components must not exceed 1mm per meter, verticality deviation must not exceed 2mm per meter, and surface verticality deviation must not exceed 3mm.

II. Key Stages and Measures for Dimensional Deviation Control

Dimensional deviation control runs through the entire production process and must start from three core stages: molds, production, and curing. For molds, high-precision steel molds or polyurethane molds are used, with mold dimensional deviation controlled within ±0.5mm; Qinglong manufactures molds using CNC machining technology to ensure mold precision. In the production stage, automated material distribution equipment is used to keep slurry pouring thickness uniform, mold displacement is prevented during vibration, and 3D laser positioning technology is applied to monitor component forming dimensions in real time. In the curing stage, constant temperature and humidity steam curing is adopted to prevent component shrinkage deformation caused by uneven temperature and humidity. In the Yangshengtang Pharmaceutical Hangzhou Industrial Park project, Qinglong reduced component shrinkage deformation to a minimum through precise curing control. In addition, every component undergoes full-dimensional inspection before leaving the factory, and any non-conforming product is reworked without exception.

III. Deviation Control Priorities for Different Types of Components

Different types of UHPC components have different priorities in dimensional deviation control. For flat panel components, the focus is on controlling length, width, and flatness to ensure jointing precision; for special-shaped components (such as double-curved panels and hollow-out components), the focus should be on controlling curvature radius and angular deviation. In the Guangxi New Media Center double-curved UHPC exterior wall panel project, Qinglong used BIM technology to simulate the forming process and precisely control the dimensional deviation of each panel; for large components, the focus should be on controlling overall dimensions and joint interface deviations, ensuring installation fit through segmented production and overall assembly inspection. For decorative line components, additional control of cross-section dimensional deviation is required to ensure smooth and attractive lines. In the Nanjing Agile Riverside Garden project, Qinglong controlled the cross-section dimensional deviation of decorative lines within ±1mm.

As a national 'Specialized, Refined, Distinctive, and Innovative' enterprise, Qinglong Group has a well-established dimensional deviation control system, with clear standards and procedures for every stage from mold design to factory inspection. Leveraging 58 patented technologies and advanced production equipment, Qinglong has achieved precise control over the dimensional deviation of UHPC components, supplying high-precision components for major projects such as the Wuhan Han Show Theatre and the Shenzhen Yirui Biotechnology Building.