What Performance Indicators Should Be Tested Before UHPC Components Leave the Factory?

Pre-delivery performance testing of UHPC components is a critical step in ensuring engineering quality. Qinglong Group has established a complete testing system covering four major categories: "mechanical performance, durability, dimensional deviation, and appearance quality." In accordance with national standards and internal enterprise control standards, every batch of UHPC components must undergo rigorous testing on 12 core indicators, including compressive strength, flexural strength, and chloride ion diffusion coefficient, and can only be delivered after passing. In the Hainan International Convention and Exhibition Center project, we carried out 100% dimensional inspection and sampled performance testing on all 12,000 roof panels, ensuring the thickness deviation of each panel was controlled within ±1mm and the strength dispersion coefficient was less than 5%. This stringent quality control system is the fundamental guarantee of the outstanding quality of Qinglong UHPC products.

Mechanical Performance Testing Is the Foundation of Safety

For every batch of UHPC components, Qinglong produces specimens cured under identical conditions to test three core indicators: compressive strength (≥150MPa), flexural strength (≥15MPa), and elastic modulus (≥45GPa). Compressive tests are conducted using 100mm×100mm×100mm cube specimens, while flexural tests use 100mm×100mm×400mm prism specimens, ensuring the material strength meets design requirements. In the Wuhan Han Show Theater project, we also sent specimens to a third-party testing agency for notarized testing, providing dual quality assurance.

Durability Testing Determines Service Life

UHPC durability testing covers multiple items, including resistance to chloride ion penetration (electric flux method ≤1000 coulombs), frost resistance (strength loss after 300 freeze-thaw cycles ≤10%), and impermeability. Qinglong's laboratory is equipped with advanced chloride ion diffusion coefficient testers capable of accurately evaluating the material's resistance to corrosion. For seaside projects, we also add salt spray tests to simulate performance changes under long-term marine environments.

Precise Inspection of Dimensions and Appearance

Before leaving the factory, every UHPC component must undergo full dimensional inspection covering indicators such as length, width, thickness, flatness, and diagonal difference, with deviations strictly controlled within the range allowed by specifications. Appearance inspection focuses on defects such as surface color difference, air bubbles, and cracks. Qinglong uses a standard light source box for color difference comparison to ensure color consistency between batches. In the Shenzhen Yirui Biotechnology Building project, we even used 3D scanning technology to perform full-size digital inspection of complex shaped panels, elevating quality control to a new level.

Application of Non-Destructive Testing Technology

For critical components, Qinglong uses non-destructive testing equipment such as rebound hammers and ultrasonic instruments for on-site testing, avoiding destructive sampling. Meanwhile, we are developing a quality traceability system that embeds RFID chips into components, achieving full lifecycle quality management from production to installation. This comprehensive testing system ensures that every UHPC component leaving the factory meets the highest quality standards.