What Are UHPC Raw Materials? Analysis of UHPC Raw Material Composition and Characteristics

The exceptional performance of UHPC stems from the rigorous selection of raw materials and scientific proportioning. As a technology leader in the field of ultra-high performance concrete, Qinglong Group draws on 28 years of full industry chain experience to provide an in-depth analysis of the core composition and characteristic advantages of UHPC raw materials, delivering professional solutions for the architectural decoration industry.

In the field of contemporary architectural decoration, ultra-high performance concrete (UHPC) is becoming the material of choice for landmark buildings and high-end commercial complexes, thanks to its ultra-high strength, excellent durability, and outstanding shaping capabilities. As a national-level high-tech enterprise integrating detailed design, manufacturing, and construction installation, Qinglong Group has specialized in UHPC material applications for 28 years, producing a cumulative 600,000 square meters of various components and participating in the formulation of multiple national industry standards. From the perspective of raw material composition, this article reveals the core secret behind UHPC's "performance leap."

UHPC Raw Material System: Scientific Synergy of Four Core Components

The raw material composition of UHPC is not a simple upgrade of ordinary concrete, but the precise proportioning and synergistic action of multiple components. It mainly consists of four systems: high-performance cementitious materials, ultra-fine active admixtures, specially made fine aggregates, and high-efficiency chemical admixtures. Through more than 2,000 proportioning tests, the professional laboratory established by Qinglong Group at its production base in Nanning, Guangxi, has developed an optimized formula system adapted to different application scenarios.

High-Performance Cementitious Materials: Precise Control of the Strength Foundation

As the basic cementitious material of UHPC, cement must be Portland cement or ordinary Portland cement with a strength grade of no less than 42.5. Qinglong's production base adopts customized cement formulas to ensure a stable 28-day compressive strength of over 60MPa, while an appropriate amount of gypsum is added to regulate setting time and lay the foundation for subsequent strength development. This raw material selection standard is precisely the quality guarantee behind Qinglong's undertaking of key projects such as the Century Plaza renovation project on Nanjing East Road.

Ultra-Fine Active Admixtures: The Key to Microstructural Densification

Active admixtures such as silica fume and ultra-fine mineral powder are the core secret to UHPC achieving ultra-high performance. Guided by the "gradient filling" theory, Qinglong's technical team combines silica fume (specific surface area ≥15000m²/kg) with ultra-fine mineral powder in specific proportions to effectively fill the microscopic pores between cement hydration products, increasing material density by more than 40%. This technical solution successfully achieved a breakthrough of 200MPa compressive strength in components for the Dongguan Women and Children's Activity Center project.

Specially Made Fine Aggregates and Fiber Reinforcement: Dual Guarantee of Mechanical Performance

UHPC uses quartz sand with a maximum particle size of no more than 5mm as fine aggregate to ensure continuity of particle gradation. Qinglong Group's original "three-level graded sand" process increases the packing density of aggregates to 1.75g/cm³, significantly reducing defects in the interfacial transition zone. Combined with steel fibers or composite fibers at a volume dosage of 2-5%, the bridging effect effectively suppresses crack propagation, raising the material's flexural strength to over 20MPa and meeting the structural safety requirements of building curtain walls and special-shaped components.

High-Efficiency Chemical Admixtures: Precise Regulation of Workability

Polycarboxylate high-efficiency water reducers are the key to UHPC achieving high fluidity. The dedicated water reducer developed by Qinglong can reduce the water-binder ratio to below 0.2 while ensuring an initial slump flow of the concrete of over 700mm. Together with functional admixtures such as defoamers and retarders, workability can be precisely regulated for different construction scenarios. This technical advantage enables Qinglong UHPC products to meet the casting requirements of complex curved shapes and large-span components.

As a vice-chairman unit of the China GRC Association and a member of the International GRC Association, Qinglong Group has always upheld the mission of "creating beautiful architecture," deeply integrating scientific raw material proportioning with full industry chain services. From the special-shaped curtain walls of Canton Tower to the curved decoration of the Nanning Convention and Exhibition Center, and from landscape components for real estate projects to key overseas projects, Qinglong UHPC materials, backed by a stable raw material supply chain and 28 years of technical accumulation, provide the global architectural decoration industry with innovative solutions that combine aesthetic value and structural safety. Going forward, Qinglong will continue to drive application breakthroughs of UHPC materials in green building and intelligent construction, fulfilling its vision of "becoming a world-class leading UHPC manufacturing enterprise."