Discussion on Dimensional Deviation Control Standards and Key Technologies for UHPC Components

In the field of architectural decoration, millimeter-level precision deviations can significantly compromise the aesthetic appeal and structural safety of an entire project. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group fully understands the decisive role that dimensional deviation control plays in component quality. This article systematically explores the core essentials of dimensional deviation control for UHPC components from three dimensions—standard analysis, technical breakthroughs, and full-chain control—providing designers and owners with solutions that combine professionalism and practicality.

### Industry Standards and Technical Challenges for Dimensional Deviation of UHPC Components

With ultra-high strength and excellent durability, UHPC (Ultra-High Performance Concrete) has become the preferred material for high-end projects such as landmark buildings and commercial complexes. According to industry standards such as the General Technical Conditions for Non-Load-Bearing UHPC (Ultra-High Performance Concrete) Components (Plan No. 2024-0232T-JC), the dimensional deviation of UHPC components must be strictly controlled within ±2mm, with key areas such as joints and anchor points requiring errors of ≤1mm. This precision standard far exceeds that of traditional concrete components, placing extremely high demands on material mix proportions, forming processes, and testing technologies.

In actual production, the high fluidity and early shrinkage characteristics of UHPC materials tend to cause component deformation, while complex shapes (such as double-curved surfaces and openwork structures) further amplify the difficulty of dimensional control. Take a UHPC curtain wall project for a grand theater as an example: if the curvature deviation of its single-curvature panels exceeds 3mm, it will directly affect the smoothness of the overall facade. Based on 28 years of engineering practice, Qinglong Group has found that temperature fluctuations, mold precision, and curing processes are the three core factors causing dimensional deviations, requiring targeted solutions.

### Full-Chain Control: Key Technologies for Deviation Control from Design to Installation

**1. Digital Design and Precision Mold Technology** Qinglong Group adopts BIM parametric design and Rhino 3D modeling technology to control component dimensional errors at the 0.5mm level right from the design stage. Its self-developed steel molds and fiberglass composite molds, machined via CNC, ensure mold cavity precision of ≤0.1mm/m, with a lifespan more than 50 times that of traditional wooden molds. In the Century Plaza renovation project on Nanjing East Road, translucent UHPC components successfully achieved post-installation overall flatness errors within 1.2mm through mold pre-deformation compensation technology.

**2. Material Mix Proportion and Forming Process Optimization** Leveraging a provincial-level engineering technology center, Qinglong has developed a dedicated UHPC mix proportion scheme that reduces material shrinkage to below 0.03% through the synergistic effect of nano-scale silica fume and steel fibers. By adopting vacuum vibration and steam curing processes, the early strength of components is increased by 40%, effectively reducing deformation caused by uneven curing. Differentiated forming processes have been developed in parallel to suit the characteristics of GRG, GRC, and other materials, such as precision control technology for GRG spray molding, ensuring dimensional stability across multiple material systems.

**3. Intelligent Inspection and Installation Calibration System** By introducing 3D laser scanning and industrial CT inspection technology, every batch of components undergoes full-dimensional scanning, generating deviation heat maps for visualized control. On-site installation adopts a dual-track mode of "positioning datum + fine-tuning compensation," combined with a self-developed adjustable anchoring system to achieve millimeter-level precision calibration. In the Dongguan Women and Children's Activity Center project, this technology controlled the installation error of GRC/UHPC composite components within ±1.5mm, winning the AALBORG WHITE Cup Innovation Award.

### Qinglong's 28 Years of Experience: Full Industry Chain Advantages Behind Deviation Control

As a national "Specialized, Refined, Distinctive, and Innovative" enterprise and a participant in industry standard formulation, Qinglong Group has built a full-chain deviation control system spanning from detailed design to after-sales maintenance. Its intelligent production base with an annual capacity of 600,000 square meters and a team of 200+ technical professionals delivers integrated services from material R&D and custom mold making to on-site installation. Through long-term cooperation with leading real estate groups such as Poly and China Overseas, the company has established standard operating procedures for deviation control tailored to different application scenarios (such as municipal utility tunnels and airport curtain walls).

From UHPC sunshades for a commercial complex in Guangzhou to GRP special-shaped components for a landmark project in Malaysia, Qinglong has always practiced its mission of "creating aesthetic architecture" with "millimeter-level precision." In the future, as UHPC materials are widely applied in super high-rise and large-span buildings, dimensional deviation control will become a core indicator for measuring a company's technical strength. Choosing a supplier with full-chain service capabilities is the key to ensuring project quality and aesthetic results.