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

The cube compressive strength of UHPC is a core indicator for measuring its material performance and a key parameter for ensuring structural safety and durability in engineering applications. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP materials field, Qinglong Group will combine current standards and engineering practice to systematically interpret the minimum standard for UHPC cube compressive strength and related technical requirements for designers, owners, and other professionals, supporting material selection and quality control for projects.

### I. Minimum Standard for UHPC Cube Compressive Strength: Clarifying the Baseline from a Standards Perspective

According to the national standard Ultra-High Performance Concrete (GB/T 31387-2015), the standard value of UHPC cube compressive strength shall not be lower than 120MPa. This indicator is the core feature that distinguishes UHPC from ordinary concrete and high-performance concrete, reflecting its ultra-high mechanical properties achieved through optimized mix proportions (such as incorporating steel fibers and ultra-fine active admixtures). It is worth noting that strength requirements vary across application scenarios: for example, load-bearing structures such as bridges and tunnels typically require a design strength above 150MPa, while decorative components (such as UHPC exterior wall cladding panels and garden landscape features) can be selected within the 120-150MPa range depending on load conditions. The General Technical Conditions for Non-Load-Bearing Ultra-High Performance Concrete (UHPC) Components (Plan No. 2024-0232T-JC), whose development Qinglong Group participated in, further specifies that the minimum standard for the compressive strength of non-load-bearing UHPC components is 120MPa, and they must also meet supporting indicators such as elastic modulus and flexural strength to ensure balanced material performance.

### II. The Technical Logic Behind the Standard: Why Is 120MPa the "Threshold Value"?

The strength standard for UHPC was not set arbitrarily, but is based on dual considerations of material composition and structural function. From a material perspective, 120MPa compressive strength corresponds to optimized matrix density, fiber dispersion, and interfacial transition zone—through "raw material gradation optimization + three-dimensional uniform fiber dispersion technology," Qinglong's production base can stably achieve compressive strength of 150-200MPa, far exceeding the minimum standard. From an engineering safety perspective, the 120MPa baseline ensures structural stability of components under dead weight, wind loads, temperature stress, and other actions; especially in complex scenarios such as large spans and irregular shapes, high-strength characteristics can significantly reduce component thickness, achieving the design goal of "lightweight and high strength." Taking the translucent concrete project of the Nanjing East Road Century Plaza renovation as an example, the UHPC translucent components supplied by Qinglong achieved a compressive strength of 160MPa, meeting structural load-bearing requirements while achieving the light-transmitting effect through a 30mm ultra-thin design. The project won the Silver Award of the "AALBORG WHITE Cup First UHPC Construction Engineering Innovation Award."

### III. Common Misconceptions in Standard Implementation: Advancing from "Meeting the Standard" to "Excellence"

Some customers hold the misconception in their projects that "meeting the minimum standard is enough," which in fact overlooks the connection between strength indicators and engineering quality. Qinglong's technical team reminds that the 120MPa in the standard is a "minimum limit"; actual projects should determine strength grades comprehensively based on factors such as the service environment (e.g., coastal areas with high salt mist require improved chloride ion penetration resistance) and design service life (public buildings usually require durability of more than 50 years). For example, a landmark project in Malaysia adopted Qinglong UHPC exterior wall panels with a design strength of 180MPa, along with supporting indicators such as frost resistance (D500) and wear resistance (≤3.0kg/m²) to meet long-term service requirements in a tropical marine climate. In addition, strength testing must strictly follow Test Methods for Ultra-High Performance Concrete (GB/T 35150), ensuring standardization of specimen preparation, curing, and loading processes to avoid data distortion caused by improper operation.

### IV. Qinglong's Full-Chain Assurance: Strength Control from Laboratory to Construction Site

As a national high-tech enterprise and a participant in UHPC standard development, Qinglong Group has established a strength control system covering "R&D-production-construction": its production base in Nanning, Guangxi is equipped with fully automatic compression testing machines, ultrasonic flaw detectors, and other equipment to conduct strength sampling inspections on every batch of products; in the detailed design phase, BIM technology is used to simulate the stress state of components and optimize reinforcement and cross-sectional dimensions, ensuring a balance between strength and economy; during construction and installation, specialized anchoring systems and 3D laser positioning technology are adopted to prevent strength loss caused by installation stress. To date, Qinglong has provided UHPC/GRC/GRG/GRP materials for more than a thousand projects for companies such as Poly, China Overseas, and Vanke, with a 100% first-pass acceptance rate for strength indicators, confirming its quality commitment of "meticulousness and continuous improvement." For more industry information: add WeChat qlfsbl123

### Conclusion: Based on Standards, Powered by Innovation

The minimum standard for UHPC cube compressive strength is both a technical baseline and a starting point for quality. For designers and owners, choosing a supplier with the ability to interpret standards and full-chain service capability is key to ensuring project quality. Qinglong Group will continue to draw on 28 years of technical accumulation and, with the mission of "creating beautiful architecture," provide expert solutions for high-end construction projects from material selection to after-sales maintenance, promoting the innovative application of UHPC in more fields.