Performance Indicators to Be Tested for UHPC Components Before Shipment and Key Testing Points Analysis

In the field of architectural decoration materials, ultra-high performance concrete (UHPC) has become the preferred material for high-end buildings thanks to its outstanding mechanical properties and durability. As an industry leader with 28 years of dedicated experience in UHPC/GRC/GRG/GRP materials, Qinglong Group knows well that performance testing before components leave the factory is a core step in ensuring engineering quality. Starting from the nature of the material itself, this article systematically analyzes the key testing indicators and practical points for UHPC components before shipment, providing professional technical reference for designers, owners, and engineering parties.

The “ultra-high performance” of UHPC is not a single-dimension enhancement, but a precise match between materials science and engineering requirements. Factory testing must focus on four core indicators: **compressive strength**, the foundation of structural safety, must reach the standard value of 150MPa or above; testing requires 100mm×100mm×100mm standard specimens loaded under standard curing conditions; **flexural strength**, which directly relates to the load-bearing capacity of components, requires ≥20MPa, tested using the three-point bending method with a focus on the linear relationship between mid-span load and deflection curve; **elastic modulus** reflects material stiffness and must be controlled within the range of 40-50GPa to ensure that component deformation under load meets design expectations; **durability** testing covers impermeability (penetration height ≤50mm), frost resistance (strength loss rate ≤10% after 300 freeze-thaw cycles), and carbonation depth (≤5mm), which is the key guarantee for UHPC's long-term service.

Relying on its national-level R&D center and provincial engineering technology center, Qinglong Group has established a three-level “material-component-system” testing system. At the **raw material intake stage**, steel fiber content (2%-5% by volume), silica fume activity index (≥95%), and fine aggregate gradation are strictly screened to ensure stable performance of every batch of materials; **during production**, an automated mixing system controls the water-binder ratio (≤0.2) and mixing time (≥180 seconds), while embedded sensors monitor temperature field changes inside components in real time to prevent microcracks caused by hydration heat; **before shipment**, ultrasonic flaw detection is used to inspect internal defects, and three-dimensional scanning accuracy verification (error ≤2mm) is carried out for special-shaped components (such as double-curved curtain wall panels and openwork reliefs), along with static load tests simulating actual working conditions to verify structural safety.

As a participating drafting unit of the industry standard “General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC),” Qinglong Group deeply integrates standard requirements with engineering experience. For example, in **surface quality testing**, in addition to routine flatness (≤3mm/m) and color difference (△E≤3) checks, gloss meters (60° angle gloss ≥60GU) and chloride ion penetration coefficient tests (≤1×10⁻¹²m/s) have been innovatively introduced to ensure that components combine aesthetics with durability. For projects exported overseas (such as projects in Southeast Asia and Australia), additional ASTM C1856 impact resistance testing and EN 13501-1 fire rating certification are also required to fully meet international market requirements.

From material R&D to project implementation, quality control of UHPC components runs through the entire life cycle. Guided by the philosophy of “meticulousness and the constant pursuit of excellence,” Qinglong Group has transformed 28 years of full-chain experience into standardized testing processes, safeguarding the bottom line of building safety while providing technical support for designers to realize their creative visions. In the future, as UHPC sees wide application in municipal, transportation, cultural tourism, and other fields, a scientific and standardized testing system will become the core competitiveness for high-quality development of the industry.