UHPC Casting Methods and Key Construction Points Explained

UHPC Casting Methods and Key Construction Points Explained

In the field of contemporary architecture, Ultra-High Performance Concrete (UHPC), with its outstanding mechanical properties and shaping potential, is becoming a core material for shaping architectural aesthetics and structural safety. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group has always taken "Creating Beautiful Architecture" as its mission, providing expert-level solutions for designers and owners through full-chain service capabilities. This article systematically analyzes the mainstream casting methods of UHPC and key construction points, helping industry peers precisely master the essence of applying this high-performance material.

**UHPC Casting Process System: From Material Characteristics to Construction Logic**

The casting process of UHPC must fully adapt to its material characteristics of low water-binder ratio and high fiber content; currently, mainstream methods can be divided into three categories. Precast casting, with the advantage of standardized molds, is suitable for mass production of shaped products such as curtain wall panels and landscape components. Qinglong's Guangxi production base has achieved an annual capacity of 600,000 square meters, ensuring component strength above 150MPa through automated vibration and steam curing. On-site casting is mostly used for irregular structural joints, such as bridge piers and complex curved shapes, requiring self-compacting casting technology to reduce air bubbles, combined with vacuum-assisted forming to improve density. Sprayed casting shows advantages in scenarios such as tunnel lining and structural reinforcement, uniformly mixing UHPC with steel fibers through high-pressure spray guns to achieve rapid construction and tight bonding with complex substrates.

**Precast Casting Construction Points: Quality Control in Industrialized Production**

The quality of precast UHPC components depends on the coordination of material proportions, mold precision, and curing regimes. Qinglong adopts BIM technology for parametric mold design at the detailed design stage to ensure accurate reproduction of complex shapes. During material mixing, steel fiber dispersion must be strictly controlled, using a planetary mixer for 30 minutes of high-speed mixing to avoid fiber clumping. During casting, material should be placed in layers, each layer no thicker than 50mm, combined with high-frequency vibration (200Hz) to ensure air bubbles escape. The curing stage adopts a dual-stage process of "steam curing + natural curing": after 24 hours in a 60°C steam environment, components are transferred to 28 days of standard curing, achieving the optimal balance between early strength and durability.

**Key Technologies for On-Site Casting: Process Breakthroughs in Complex Scenarios**

On-site casting faces challenges such as numerous environmental variables and limited construction space, requiring control across three dimensions. The formwork system should use steel molds or high-strength composite formwork, ensuring stiffness meets the UHPC casting pressure (usually not less than 50kPa), with double sealing at joints to prevent slurry leakage. During casting, concrete flowability must be monitored, adjusting admixture dosage to control the spread at 750±50mm to achieve self-compacting filling. For mass UHPC components, segmented casting and embedded temperature monitoring systems should be used to keep internal temperature rise within 25°C to avoid thermal cracks. In the Century Plaza renovation project on Nanjing East Road, Qinglong successfully achieved seamless splicing of translucent concrete curtain walls through this process, winning the first UHPC Construction Engineering Innovation Award.

**Full-Process Quality Assurance: Technical Accumulation from Qinglong's 28 Years of Experience**

As a national high-tech enterprise and participant in industry standard formulation, Qinglong has established a full-chain quality system covering "design - production - construction - maintenance." On the material side, imported silica fume and ultra-fine quartz sand are used to optimize gradation, ensuring active mineral admixtures account for over 40%; the construction side is equipped with professional installation teams, using 3D laser scanning technology to achieve millimeter-level positioning; the after-sales stage provides a 5-year warranty and regular testing services. This philosophy of "meticulousness and striving for excellence" has made Qinglong a strategic partner of renowned real estate groups such as Poly and China Overseas, with products exported to overseas markets including Southeast Asia and Australia.

The UHPC casting process is a perfect combination of material characteristics and engineering needs, requiring both rigorous technical control and rich project experience. Qinglong Group will continue to leverage its 28-year full-chain service advantages, promoting the wide application of UHPC in the field of architectural decoration through technological innovation and standard leadership, forging ahead toward the vision of "becoming a world-class leading enterprise in UHPC/GRC/GRG/GRP manufacturing."