How Can Large UHPC Panels Achieve a Continuous Stone Vein Effect on Their Surface? Stone Texture Replication Process and Optimization Solutions

Continuous stone grain effects on the surface of large UHPC panels can enhance the visual quality of a building's exterior, but they are difficult to form and prone to problems such as grain breakage and poor transitions. Achieving a continuous, natural stone grain through precise mold fabrication and process optimization is central to the decorative effect of large UHPC panels. Drawing on its experience in stone-imitation projects such as the Dongting Lake Museum and Panzhihua, Sichuan, Qinglong analyzes the implementation path and practical solutions.

I. Core Principle for Achieving the Continuous Stone Grain Effect

The continuous stone grain effect is achieved through the coordinated use of mold replication and material color matching. The mold is the key to pattern transfer: 3D scanning technology for natural stone is used to replicate the stone grain at a 1:1 ratio, ensuring precise pattern details; mold splicing technology seamlessly joins the patterns of individual mold sections, forming the continuous stone grain of large UHPC panels. In terms of materials, natural quartz aggregates and mineral pigments are selected and proportioned according to the composition of the stone, making the UHPC panel material highly consistent with natural stone and enhancing the realism of the stone grain. In the Singapore National Defence Service Center project, Qinglong applied this principle to achieve continuous stone grain effects on thousands of square meters of large UHPC panels, with pattern transition errors ≤0.5mm.

II. Core Manufacturing Process for Continuous Stone Grain on Large UHPC Panels

Process optimization is a key step in ensuring grain continuity. Mold fabrication adopts a "segmented scanning + integrated splicing" technique: the natural stone is first 3D-scanned by zones, then the pattern data is spliced using BIM technology to produce segmented steel molds, with pattern errors at the splices ≤0.2mm; a dedicated release agent is applied to the mold surface to ensure the stone grain is fully transferred to the UHPC panel surface; casting adopts a "layered casting + high-pressure vibration" method, with each layer ≤50mm thick and vibration pressure ≥0.3MPa, ensuring the slurry fully fills the mold patterns and preventing grain voids caused by air bubbles; curing takes place in a constant-temperature, constant-humidity environment to avoid uneven surface shrinkage due to temperature changes that could affect grain continuity. In the Nanning Liyuan Hotel project, Qinglong used this process to achieve a perfect continuous stone grain on large UHPC panels.

III. Key Quality Control Measures for Grain Continuity

Full-process quality control ensures the stone grain is continuous and natural. Raw material control: aggregates and pigments with uniform color are selected, and color comparison tests are performed on every batch, with materials exceeding the deviation limit prohibited from use. Mold splice inspection: a laser rangefinder is used to check mold splicing gaps, which must be ≤0.2mm, and manual visual inspection is carried out to check pattern transitions and ensure no misalignment. Finished product testing: a 3D scanner is used to detect the surface stone grain of UHPC panels and compare it with the design pattern, with continuity required to be ≥99%; broken grain must be manually repaired using a dedicated stone grain repair agent to ensure the repaired area matches the original pattern. During mass production, raw materials and process parameters are kept uniform to avoid grain differences between batches. Through strict quality control, Qinglong achieves a pass rate of over 98% for continuous stone grain on large UHPC panels.

IV. Stone Grain Optimization Solutions for Special Scenarios

The stone grain implementation plan is adjusted for different scenarios. Extra-large UHPC panels (area >10㎡): multiple molds are spliced and pattern transition zones are set up to avoid conspicuous splicing marks. Curved UHPC panels: molds combine flexible materials with rigid frames to ensure natural, continuous grain on curved surfaces and prevent grain breakage caused by stretching deformation. Large UHPC panels installed at heights: the stone grain is treated for UV resistance and the surface is coated with fluorocarbon varnish, which both protects the grain from fading and enhances the visual effect of continuity. In the Shenzhen Pingshan High-tech Zone Comprehensive Service Center project, Qinglong implemented targeted solutions to achieve continuous stone grain effects on large UHPC panels in different scenarios, earning high recognition from both the designers and the owner.