Key Points and Technical Specifications for UHPC Construction: An Analysis

In the field of architectural decorative materials, UHPC (Ultra-High Performance Concrete) is becoming the material of choice for high-end construction projects thanks to its outstanding mechanical properties and design expressiveness. However, the complexity of its construction process places extremely high demands on technical specifications and attention to detail. 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 benchmark projects to provide an in-depth analysis of the key points and technical specifications of UHPC construction, offering professional guidance for designers and project contractors.

I. Material Properties and Pre-Construction Preparation: The Foundation of UHPC Construction

The unique characteristics of UHPC material require systematic preparation before construction. Its ultra-high strength (compressive strength up to 150-200MPa) and low water-binder ratio demand strict control of temperature and humidity in the raw material storage environment, as well as the use of specialized mixing equipment to ensure uniformity. The fully automated proportioning system at Qinglong Group's Nanning production base enables precise metering of aggregates, steel fibers, and cement-based materials, with errors controlled within ±1%, guaranteeing stable material performance at the source. Meanwhile, before construction, a 3D laser scan of the substrate must be carried out, and BIM technology used to rehearse the installation process, ensuring a perfect fit between components and the structural substrate. This technology was successfully applied in the renovation of Century Plaza on Nanjing East Road, achieving zero-error joining of translucent UHPC components.

II. Key Construction Techniques: Full-Process Control from Mixing to Curing

The core of UHPC construction lies in the refined management of process parameters. During the mixing stage, the water-powder ratio must be strictly controlled (typically 0.16-0.22), using a two-stage process of 3 minutes of low-speed mixing followed by 5 minutes of high-speed mixing to ensure steel fibers are evenly dispersed without clumping. During pouring, vacuum-assisted casting technology should be adopted to reduce bubble formation; especially for components with complex shapes (such as hyperbolic exterior wall panels), Qinglong Group's proprietary "layered pouring + high-frequency vibration" process can effectively prevent honeycombing and surface pitting. The curing stage requires 7 days of steam curing in a constant-temperature environment of 20-25°C, followed by 28 days of natural curing to ensure the strength reaches the required standard. Taking the Dongguan Women and Children's Activity Center project as an example, through this process control, the 28-day compressive strength of the UHPC components reached 180MPa, far exceeding the design requirements.

III. Installation Technical Specifications: Dual Assurance of Safety and Precision

UHPC component installation must balance structural safety and decorative precision. Qinglong Group adopts a "3D positioning + modular installation" system, in which pre-embedded connectors provide rigid connections to the main structure; connector load capacity must be verified through pull-out tests (single-anchor pull-out force ≥50kN). For large-span components (such as cantilevered sunshades), wind load and seismic calculations are required, and finite element analysis software should be used to simulate stress conditions when necessary. Installation tolerances must be controlled within ±2mm, and joints filled with specialized sealant to ensure watertightness and durability. In addition, RFID chips are embedded in all installation nodes to enable full life-cycle quality traceability—a technology already validated in multiple landmark projects.

IV. Quality Control and Acceptance Standards: The Rigorous Requirements of an Industry Benchmark

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 has established enterprise standards that exceed national standards. During construction, each batch of components must be tested for indicators such as flexural strength (≥25MPa), elastic modulus (≥40GPa), and frost resistance (strength loss ≤5% after 300 freeze-thaw cycles). Surface flatness deviation must be ≤3mm/2m, and color uniformity ΔE≤3. Upon acceptance, complete material test reports, construction records, and third-party inspection certificates must be provided to ensure project quality meets design requirements.

UHPC construction represents a deep integration of technology and experience—every step from material preparation to installation acceptance requires meticulous control by a professional team. With 28 years of full-chain experience, Qinglong Group has developed integrated solutions from detailed design to after-sales maintenance. Its Malaysia Twin Towers UHPC curtain wall project and multiple GRG ceiling projects for cultural venues across China have all become industry exemplars. Going forward, as UHPC sees wider application in the construction field, standardized construction will become key to project success, and Qinglong Group will continue to drive industry development through technological innovation, helping realize its mission of "Creating Beautiful Architecture."