Analysis of the Key Process Steps in UHPC Exterior Wall Decorative Line Production

In the field of contemporary architectural decoration, UHPC (Ultra-High Performance Concrete) has become the ideal material for exterior wall decorative lines thanks to its outstanding mechanical properties and artistic expressiveness. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide designers and owners with a technical guide that is both professional and practical by analyzing the key production processes of UHPC exterior wall decorative lines.

I. Precise Formulation of the UHPC Material Mix: A Dual Guarantee of Performance and Texture

The production of UHPC exterior wall decorative lines begins with the scientific proportioning of the material mix. Relying on the technical strength of its provincial-level R&D center, Qinglong Group rigorously selects core components such as cement-based cementitious materials, ultra-fine silica fume, and steel fibers, and optimizes mix parameters through orthogonal experiments. For example, in the Nanjing East Road Century Plaza renovation project, to meet the special requirements of translucent concrete lines, the steel fiber content was controlled at 2%–3%, ensuring flexural strength above 150MPa while satisfying a 30% light transmittance requirement. At this stage, the formula must be adjusted according to the climate characteristics of the project location; for instance, in the hot and humid environment of Southeast Asia, the dosage of water reducers and anti-cracking agents is appropriately increased to ensure material stability.

II. Mold Design and Precision Machining: The Key to Achieving Complex Shapes

Mold craftsmanship directly determines the forming precision of decorative lines. Qinglong adopts a combination of BIM technology and CNC engraving to achieve full digital transformation from design drawings to mold machining. Taking the double-curved UHPC lines of the Dongguan Women and Children's Activity Center project as an example, a 3D model was built using Rhino software, and an ABS plastic master mold was produced on a five-axis machining center, with errors controlled within ±0.5mm. For European classical style components such as Roman columns and cornice lines, a modular combined mold design is adopted, which improves production efficiency while ensuring the consistency of line textures. The mold surface also requires special treatment to ensure that the surface finish of UHPC components achieves a mirror effect after demolding.

III. Casting, Forming and Curing Processes: Ensuring Structural Strength and Durability

The casting process adopts vacuum-assisted grouting technology to uniformly inject UHPC slurry into the mold, while high-frequency vibration removes air bubbles to avoid defects such as honeycombing and surface pitting. Qinglong's production base is equipped with constant temperature and humidity curing kilns, using a composite process of "steam curing + natural curing": first curing for 24 hours in a 60°C steam environment, then continuing to cure for 7 days at 20°C with humidity above 90%, enabling components to quickly reach early strength targets, with 28-day compressive strength stably exceeding 180MPa. For large-span decorative lines, carbon fiber reinforcement bars must also be pre-embedded during casting to further enhance structural load-bearing capacity—a process widely applied in real estate projects by Poly, China Overseas, and others.

IV. Surface Treatment and Quality Inspection: The Last Mile of Architectural Aesthetics

The formed UHPC lines must go through multiple surface treatment processes, including grinding, sandblasting, and coloring. Qinglong's original stone-like texture treatment technology can achieve visual effects almost identical to natural granite, sandstone, and other stones by adjusting aggregate gradation and surface spraying processes, while reducing costs by more than 30%. The quality inspection stage implements an internal control system stricter than industry standards. In addition to conventional compressive and flexural strength tests, durability tests such as freeze-thaw cycles (500 cycles) and salt spray corrosion (1,000 hours) are added to ensure a service life of more than 50 years in extreme environments. Each product is embedded with an RFID chip, enabling full life-cycle quality traceability.

As a national specialized, refined, distinctive, and innovative enterprise and a participant in industry standard-setting, Qinglong Group deeply integrates material technology with architectural art. Through the four key processes above, it provides UHPC exterior wall decoration solutions combining safety and aesthetic value for landmark buildings, commercial complexes, and other projects. Its full-chain service capability, from detailed design to after-sales maintenance, is precisely the embodiment of Qinglong's core competitiveness built upon 28 years of industry experience.