How to Verify the Authenticity of Strength Indicators Claimed by UHPC Manufacturers?

Verifying the authenticity of the strength indicators claimed by UHPC manufacturers is a core step in ensuring project safety and quality. As Qinglong Group, with 28 years of deep expertise in the UHPC field, we believe—based on practical experience from major projects such as the Shenzhen Yirui Biotechnology Building and the Hainan International Convention and Exhibition Center—that strength indicator verification should be comprehensively completed through a four-tier system: third-party testing, physical sampling, historical data tracing, and on-site inspection. High-quality UHPC should have a compressive strength of ≥120MPa and a flexural strength of ≥15MPa, but manufacturer-claimed data must be verified through scientific means to avoid project risks caused by inflated figures.

Third-party authoritative testing is the foundation of verification. Require manufacturers to provide reports from nationally accredited testing institutions, such as test certificates issued by the National Building Materials Testing Center. Qinglong Group sends samples from every production batch to the Guangdong Institute of Building Science for testing, with the compressive strength coefficient of variation controlled within 5%. For the Wuhan Han Show Theatre project, we invited owner representatives to jointly take samples, which were sent to the Shanghai Institute of Building Science for retesting; the results showed a deviation of ≤3% from the claimed data, demonstrating transparency. Test reports should include detailed information such as specimen dimensions, curing conditions, and test methods to ensure traceability.

Physical sampling tests strengthen verification. Randomly select finished panels at the manufacturer's production base and conduct destructive tests on site. Qinglong Group's Nanning production base has a standardized laboratory equipped with a 2000kN compression testing machine, and customers are welcome to witness the testing process. For important projects, a sampling ratio of no less than 3% is recommended, covering different production batches. In the roofing project of the Hainan International Convention and Exhibition Center, full-scale tests verified the performance of UHPC panels under ultimate loads, with data highly consistent with the claims.

Tracing historical project data provides supporting evidence. Examine the long-term performance of the manufacturer's past projects, such as strength retention rates after 5-10 years. The industry standard "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)", which Qinglong Group helped compile, requires the provision of accelerated aging test data. By reviewing acceptance reports of completed projects, the reliability of the manufacturer's data can be verified. Case studies show that after 5 years of use in coastal high-salt-spray environments, Qinglong UHPC achieved a strength retention rate of ≥95%, far exceeding the industry standard.

On-site inspection assesses process control capability. High-quality strength indicators stem from stable production processes. Visit the manufacturer's production line and pay attention to key aspects such as batching accuracy (weighing error ≤±0.5%) and curing regimes (temperature fluctuation ≤±2℃). Qinglong Group monitors the entire process through a BIM system to ensure that every panel meets strength requirements. By combining these measures, the authenticity of manufacturer-claimed data can be scientifically verified, providing a reliable basis for project selection.