What Is the Minimum Cube Compressive Strength Standard for UHPC and an Interpretation of Related Codes

In the field of building materials, Ultra-High Performance Concrete (UHPC) is becoming the material of choice for high-end architectural decoration and structural engineering thanks to its outstanding mechanical properties and durability. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP field, Qinglong Group will interpret the core standards of UHPC cube compressive strength for designers and owners from the perspectives of standards, technical characteristics, and engineering practice, supporting project material selection decisions.

### I. Minimum Standards and Regulatory Basis for UHPC Cube Compressive Strength

According to industry standards such as the “General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components” (Plan No. 2024-0232T-JC), the minimum standard for UHPC cube compressive strength is 120MPa. This figure far exceeds that of ordinary concrete (C30-C50) and high-performance concrete (C80-C100), reflecting its core characteristic of “ultra-high performance.” The standard also specifies that UHPC used in load-bearing structures or special environments must be raised to 150MPa or above according to design requirements; for example, bridge engineering often uses 180MPa-grade UHPC materials.

As a participating developer of this standard, Qinglong Group strictly implements a “dual-control system for material performance” in production: on the one hand, precise proportioning of raw materials such as quartz sand, steel fibers, and ultra-fine mineral powder ensures that compressive strength consistently meets requirements; on the other hand, third-party testing institutions are engaged to conduct full inspections of every batch of products on 28 indicators including cube compressive strength, elastic modulus, and impermeability, maintaining a 100% data pass rate.

### II. The Technical Logic Behind the Standard: Why Is 120MPa the Performance Watershed?

UHPC's high strength stems from the optimization of its microstructure: incorporating steel fibers (typically at 2%-5% by volume) creates a three-dimensional randomly distributed reinforcement system, which, combined with a low water-binder ratio (0.18-0.25) and high-temperature curing processes, reduces the concrete's internal porosity to below 3%, achieving the synergistic improvement of “toughness and strength.” When cube compressive strength reaches 120MPa, UHPC's flexural strength can exceed 20MPa, with fracture toughness 20 times that of ordinary concrete, effectively resisting impact loads and fatigue damage.

Take the Nanjing East Road Century Plaza renovation project, in which Qinglong participated, as an example: its translucent UHPC components not only had to meet the 150MPa compressive strength requirement, but also had to pass 3 million cycles of fatigue testing to verify durability. The “gradient functional design” technology used in the project precisely matched the material properties of the high-strength zones and translucent zones, ensuring structural safety while achieving artistic light-and-shadow effects. The project won the “Silver Award of the First UHPC Building Engineering Innovation Award, AALBORG WHITE Cup.”

### III. Standard Application in Engineering Practice and Qinglong's Full-Chain Service Advantages

In actual projects, UHPC strength standards must be dynamically adjusted according to application scenarios: municipal landscape components (such as benches and planters) can use 120MPa basic-grade products, while facade cladding panels of landmark buildings or large-span shading systems require an increase to 150-200MPa. Backed by 28 years of full-chain experience, Qinglong Group provides “customized strength solutions”:

1. **Design development stage**: BIM technology is used to simulate the stress states of UHPC at different strength grades, combined with Rhino parametric design to optimize component cross-sections, reducing material usage while meeting strength requirements—for example, a commercial complex project reduced component weight by 18% through strength gradient design.

2. **Manufacturing stage**: Automated material distribution machines and steam curing kilns are used to ensure strength uniformity (strength standard deviation within the same batch ≤5MPa). The production base in Nanning, Guangxi has an annual capacity of 600,000 square meters, capable of meeting the continuous supply of high-strength UHPC components for large projects.

3. **Construction and installation stage**: Specialized lifting equipment and 3D laser positioning systems are deployed, and anchoring joint designs are optimized to address the brittle nature of high-strength UHPC—for example, a grand theater project used “flexible connection” technology to control installation error within ±2mm.

### IV. Industry Trends: From “Meeting Strength Requirements” to “Performance Customization”

As UHPC application scenarios expand, simply pursuing high strength can no longer meet demands. The “functional UHPC” series developed by Qinglong Group in collaboration with a provincial R&D center achieves composite functions such as light transmission, self-cleaning, and thermal insulation while guaranteeing a base strength of 120MPa. For example, UHPC facade panels used in a Saudi Arabian airport project achieve photocatalytic self-cleaning through the incorporation of nano titanium dioxide, reaching a compressive strength of 160MPa while improving surface dirt decomposition by 40%.

As a national “specialized, refined, distinctive, and innovative” enterprise, Qinglong has always taken “creating beautiful architecture” as its mission, providing professional and reliable UHPC solutions for designers and owners, from standard-setting to technological innovation. In the future, as standards such as “Ultra-High Performance Concrete (UHPC) Facade Panels” are refined, UHPC materials will bring their unique value of “high strength, high toughness, and high durability” to more high-end buildings.