Key Considerations and Technical Standards for UHPC Construction

In the field of contemporary architecture, ultra-high performance concrete (UHPC) is becoming the preferred material for landmark buildings, high-end commercial complexes, and other projects thanks to its outstanding mechanical properties and design flexibility. However, UHPC construction involves multiple dimensions including material characteristics, process precision, and specification standards—an oversight at any stage can affect the final result. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on the practice of hundreds of large-scale projects to analyze the key points and technical specifications of UHPC construction for you.

I. Material Characteristic Control: The Fundamental Prerequisite of UHPC Construction
UHPC differs fundamentally from traditional concrete in mix proportions, curing, and other aspects, so material performance parameters require close attention before construction. According to the industry standard General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC) (Plan No. 2024-0232T-JC), the compressive strength must be ≥120MPa and the elastic modulus should be controlled within the 30-45GPa range. In production, Qinglong Group ensures material homogeneity by precisely controlling steel fiber content (typically 2-5% by volume) and the water-binder ratio (≤0.2), avoiding strength dispersion caused by uneven fiber distribution. During construction, note: secondary water addition is strictly prohibited during material transport, and slump loss must be tested before pouring to ensure workability meets design requirements. For more industry information: +WeChat qlfsbl123

II. Formwork Engineering: The Core Guarantee of UHPC Molding Quality
UHPC components often involve complex curved surfaces and hollowed-out shapes, and the stability and precision of the formwork system directly determine the molding quality. Qinglong Group recommends steel formwork or high-strength composite formwork, with sealing rubber strips at formwork joints to prevent slurry leakage. For double-curved components, BIM technology can be combined with parametric modeling, and 3D scanning technology can ensure formwork errors of ≤2mm. Taking the translucent concrete project of the Nanjing East Road Century Plaza renovation as an example, custom steel formwork and vacuum casting technology achieved precise molding of UHPC components with 25% light transmittance, and the project won the Silver Award at the AALBORG WHITE Cup First UHPC Construction Engineering Innovation Awards.

III. Key Construction Process Points: Full-Process Control from Casting to Curing
UHPC casting requires mechanical vibration; the vibration time should be until slurry bleeds on the surface with no air bubbles, avoiding over-vibration that breaks steel fibers. For large-volume components, layered casting (each layer ≤500mm thick) should be applied and temperature measurement points set to ensure the temperature difference between interior and exterior is ≤25℃. The curing stage is especially critical: standard curing conditions are a temperature of 20±2℃ and relative humidity ≥95%, with a curing period of no less than 7 days. Qinglong Group's production base in Nanning, Guangxi is equipped with fully automatic curing kilns; through steam curing and constant temperature and humidity control, the early strength of UHPC is increased by 30%, effectively reducing shrinkage cracks. For more industry information: +WeChat qlfsbl123

IV. Installation and Acceptance: Ensuring the Unity of Structural Safety and Decorative Effect
UHPC component installation should follow the principle of “primary first, secondary later; layered installation”, using embedded bolts or welded connections, with the load-bearing capacity of connectors verified by pull-out tests. Qinglong Group's original “3D laser positioning + modular installation” process achieves component jointing errors of ≤1mm; for example, in the Dongguan Women and Children's Activity Center project, the installation precision of GRC/UHPC composite exterior wall panels reached an industry-leading level and won the Silver Award of the GRC Construction Engineering Innovation Award. Acceptance should follow specifications such as the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), with key checks on surface flatness, joint treatment, and structural load-bearing capacity.

As a national high-tech enterprise and a participant in the formulation of UHPC/GRC industry standards, Qinglong Group has always upheld an attitude of “meticulousness and striving for perfection”, providing global customers with full-chain services from detailed design to after-sales maintenance. Whether for real estate, municipal, or overseas projects, choosing an experienced UHPC manufacturer is the key to ensuring project quality. Looking ahead, Qinglong will continue to advance UHPC technological innovation to help realize its mission of “creating aesthetically beautiful architecture”.