Typical Compressive Strength of 30mm Thick UHPC Panels and Analysis of Influencing Factors

Technology-empowered material innovation: the breakthrough compressive strength of 30mm UHPC panels redefines the boundaries of building safety and aesthetics.

In the field of contemporary architectural decorative materials, Ultra-High Performance Concrete (UHPC) is becoming the material of choice for high-end construction projects thanks to its outstanding mechanical properties and design plasticity. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group has witnessed and driven the entire journey of UHPC materials from the laboratory to practical engineering applications. This article focuses on the compressive strength performance of 30mm thick UHPC panels and their core influencing factors, providing professional reference for designers, owners, and industry peers.

### I. Compressive Strength Benchmarks and Engineering Value of 30mm UHPC Panels

As a common specification among non-load-bearing components, 30mm thick UHPC panels typically achieve a compressive strength of 150-200MPa, far exceeding the 30-50MPa performance level of ordinary concrete. This data comes from continuous testing of C120 grade UHPC materials in Qinglong Group's laboratory. Under standard curing conditions, the panels not only meet the mechanical requirements of exterior wall cladding for commercial complexes and shading components for landmark buildings, but also achieve a building weight reduction of over 30% through thin-profile design, making complex architectural forms feasible. For example, in the Nanjing East Road Century Plaza renovation project, the translucent UHPC panels (30mm thick) supplied by Qinglong met the design standard of 180MPa compressive strength while achieving an artistic expression of the building envelope through light and shadow effects.

### II. Analysis of the Four Core Factors Affecting UHPC Compressive Strength

**1. Raw Material Proportions: The Foundation of Strength**
The compressive strength of UHPC depends first on the optimized proportions of cementitious materials such as cement, silica fume, and ultra-fine quartz sand. The "dual admixture technology" (silica fume + nano calcium carbonate) adopted by Qinglong Group significantly improves matrix density. Combined with Grade 52.5 low-alkali cement and specially made steel fibers (aspect ratio 200), the internal porosity of 30mm panels is controlled below 3%. Compared with conventional industry formulations, Qinglong's patented formula (Patent No.: ZL2023XXXXXX) can increase compressive strength by 15%-20%.

**2. Forming Process: Quality Assurance of Industrialized Production**
In the production of 30mm thin panels, Qinglong uses a fully automated production line featuring "vacuum casting + high-frequency vibration + steam curing" to ensure material uniformity and interfacial bond strength. In particular, to address the air bubbles and surface pitting that easily occur in thin-walled components, vacuum equipment imported from Germany controls the casting pressure at 0.08MPa, keeping the steel fiber distribution deviation rate ≤5%. This process standard has been incorporated as a reference in the compilation of the "General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components" (Plan No. 2024-0232T-JC).

**3. Fiber Content and Distribution: The Key Strength Enhancer**
The dosage of steel fibers (typically 2%-5% by volume) and their dispersion directly affect the compressive toughness of UHPC. Qinglong achieves three-dimensional oriented fiber distribution through a 3D mixing system, forming a uniform "skeletal network" within the 30mm panel thickness. When the material is under compression, the fiber bridging effect effectively suppresses crack propagation, shifting the failure mode from brittle fracture to ductile failure, with the coefficient of variation in compressive strength controlled within 8%.

**4. Curing Regime: The "Last Mile" of Performance Enhancement**
Standard curing (constant 20°C + 95% humidity) for 28 days is the baseline, but Qinglong innovatively adopts a composite regime of "72 hours of steam curing (80°C) + 21 days of natural curing" to accelerate the hydration reaction of cementitious materials, enabling the early strength (7 days) of 30mm panels to reach 85% of the design value and meeting the delivery needs of projects with tight schedules.

### III. Qinglong UHPC Full-Chain Service: From Strength Assurance to Value Realization

As a National High-Tech Enterprise, Qinglong Group not only provides high-performance UHPC materials but also converts material performance into engineering value through full-chain services covering detailed design, manufacturing, construction and installation, and after-sales maintenance. For example, in the Dongguan Women and Children's Activity Center project, for the 30mm thick UHPC decorative cladding panels, the Qinglong team optimized anchor joint design through BIM technology and, combined with on-site 3D scanning positioning, achieved zero-error jointing in the installation of 10000㎡ of panels. Their compressive strength and installation safety were recognized with the "GRC Construction Engineering Innovation Award."

In the future, with the widespread application of UHPC materials in municipal, real estate, and overseas projects, 30mm thin panels will leverage their advantages of "high strength + lightweight + high durability" to become an ideal alternative to traditional stone and metal curtain walls. Qinglong Group will continue to build on its 28 years of technical expertise to provide the industry with expert-level solutions from material R&D to engineering implementation, driving the technological upgrade of architectural decorative materials.