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

Realizing architectural aesthetics depends on millimeter-level precision control. In the application of UHPC components, dimensional deviation control is the core factor determining project quality and an important reflection of the industry's technical strength. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group has always regarded dimensional precision as its product lifeline, providing millimeter-level quality assurance for global landmark projects through full-chain technological innovation.

### Industry Challenges and Standards for UHPC Component Dimensional Deviation

Ultra-high performance concrete (UHPC) has become the ideal choice for modern building envelopes thanks to its ultra-high strength, excellent durability, and design freedom. However, its material properties and complex shape requirements impose stringent demands on dimensional control. According to the industry standard "General Technical Conditions for Non-Load-Bearing UHPC Components" (Plan No. 2024-0232T-JC), the length deviation of UHPC components must be controlled within ±3mm, thickness deviation must not exceed ±2mm, and flatness error must be ≤2mm/m. This standard is not only stricter than that for traditional concrete products, but also tests manufacturers' full-process control capabilities from material formulation to construction and installation.

### Full-Chain Key Technologies: A Precision Revolution from Laboratory to Construction Site

Relying on the technical accumulation of its national-level R&D center and provincial engineering technology center, Qinglong Group has built a four-dimensional control system covering "materials–molds–production–installation." At the material level, by optimizing steel fiber content and gradation design, the early shrinkage rate of UHPC has been reduced to 0.03%, minimizing deformation errors at the source. In mold craftsmanship, aviation-grade aluminum alloy and CNC precision machining ensure mold dimensional accuracy error of ≤0.1mm/m, more than 10 times better than traditional wooden molds.

The production stage introduces Industry 4.0 intelligent production lines equipped with online laser diameter gauges and 3D scanning inspection systems, achieving 100% full-dimension inspection of every component. For large special-shaped components, BIM parametric design and Rhino-Grasshopper parametric modeling are innovatively applied, converting design drawings directly into production-ready digital models and avoiding the cumulative errors of traditional 2D drawing conversion. In the Nanjing East Road Century Plaza renovation project, the Qinglong team used this technology to achieve millimeter-level jointing of light-transmitting UHPC components, winning the Silver Award of the first AALBORG WHITE Cup UHPC Architectural Engineering Innovation Award.

### Precision Assurance in Engineering Practice: A Case Study of the Dongguan Women and Children's Activity Center

In the Dongguan Women and Children's Activity Center (new campus site) project, the GRC/UHPC composite curtain wall system undertaken by Qinglong faced the challenges of numerous double-curved shapes and high installation precision requirements. By adopting the industrialized construction model of "precast components + on-site assembly" combined with 3D laser scanning positioning technology, on-site installation errors were controlled within ±1.5mm, perfectly presenting the flowing curve aesthetics of the design scheme. The project not only won the Silver Award of the AALBORG WHITE Cup GRC Architectural Engineering Innovation Award, but also became a benchmark case in the industry for dimensional control of complex-shaped components.

### Qinglong's 28 Years of Experience: Building an Industrial Ecosystem for Dimensional Control

As a national "Specialized, Refined, Distinctive, and Innovative" enterprise and a drafter of multiple industry standards, Qinglong understands that dimensional deviation control is not merely a technical issue but a systematic project. The company has established a full-chain quality traceability system covering detailed design, manufacturing, construction and installation, and after-sales maintenance, achieving full lifecycle management of components through embedded RFID chip technology. Today, Qinglong's production base, with an annual output of 600,000 square meters of UHPC/GRC/GRG/GRP products, has established 18 quality control points from raw material inspection to finished product delivery, ensuring that every product meets the quality commitment of "meticulous workmanship and constant pursuit of excellence."

From domestic landmark buildings to overseas projects in Southeast Asia, Qinglong has redefined the quality standards of new architectural decorative materials with its millimeter-level precision control capabilities. In the future, with the implementation of standards such as "General Technical Conditions for Non-Load-Bearing UHPC Components," the industry will enter a more standardized stage of development, and Qinglong will continue to drive industrial upgrading through technological innovation, injecting more technological strength into its mission of "creating beautiful architecture."