What Raw Materials Make Up UHPC and Their Approximate Proportions — A Comprehensive Analysis of the Raw Material Composition and Mix Ratio of Ultra-High Performance Concrete

Amid the wave of innovation in building materials, ultra-high performance concrete (UHPC) is redefining the boundaries of modern architecture with its outstanding mechanical properties and design freedom. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP field, Qinglong Group has always taken "creating beautiful architecture" as its mission, providing integrated solutions from detailed design to after-sales maintenance for landmark projects worldwide through its full-chain technical advantages. This article provides an in-depth analysis of the core raw material composition and scientific mix proportions of UHPC, revealing the performance code of this "super material" in the construction industry.

UHPC Raw Material System: Scientific Proportions of Four Core Components

UHPC's high performance is not the result of any single material, but of the synergistic effect of multiple components. Its raw material system mainly consists of cement-based cementitious materials, fine aggregates, steel fibers, and mineral admixtures, with the proportion of each component precisely adjusted in strict accordance with engineering requirements. As a national high-tech enterprise, Qinglong Group has developed unique advantages in raw material ratio optimization through the technical accumulation of its provincial-level R&D center, and can customize exclusive formula solutions according to each project's specific requirements for strength, toughness, and durability.

Cement-Based Cementitious Materials: The Core Framework of Strength

Cement, as the matrix material of UHPC, typically accounts for 25%-35% of the total raw materials, with high-strength Portland cement or sulphoaluminate cement preferred. Qinglong has established a raw material traceability system at its Nanning production base to ensure that the strength grade (≥42.5MPa) and mineral composition of each batch of cement remain stable and controllable. Meanwhile, ultra-fine cement (specific surface area ≥800m²/kg) has been innovatively introduced, providing UHPC with a solid strength foundation by increasing the hydration reaction rate and densification.

Fine Aggregates and Mineral Admixtures: Key Guarantees of a Dense Structure

Unlike ordinary concrete, UHPC uses continuously graded quartz sand as fine aggregate (30%-40% of the mix), with particle size typically controlled at 0.15-1.2mm to reduce internal pores through the close packing effect. In projects such as the renovation of Nanjing East Road Century Plaza, Qinglong innovatively added mineral admixtures such as silica fume (5%-10%) and ultra-fine slag powder (10%-15%), utilizing the "micro-aggregate filling effect" and "pozzolanic reaction" to increase material density by more than 40% and reduce the chloride ion permeability coefficient by an order of magnitude.

Steel Fibers: The Vital Element for Enhanced Toughness

Steel fibers are the core of UHPC's "ultra-high toughness", typically added at 2%-5% by volume. Qinglong uses ultra-fine straight steel fibers with a diameter of 0.15-0.25mm, enhancing their interfacial bond strength with the matrix through special surface treatment technology. In the Dongguan Women and Children's Activity Center project, this mix raised UHPC's flexural toughness index to more than 20 times that of ordinary concrete, successfully achieving reinforcement-free design for large-span irregular components.

Mix Design: The Technical Accumulation of Qinglong's 28 Years of Experience

A scientific mix ratio is the key to UHPC performance. Qinglong has built a "multi-factor collaborative optimization model" through 58 patented technologies, ensuring a compressive strength of ≥150MPa while also accounting for construction flowability and long-term durability. For example, in overseas projects, the water-binder ratio was adjusted to 0.16-0.20 for high-temperature and high-humidity environments, and nano calcium carbonate modification technology was introduced, extending product service life to more than 100 years. This refined mix design capability is a technical embodiment of Qinglong's role as a participant in industry standard-setting.

From raw material selection to mix optimization, every component of UHPC embodies the wisdom of materials science. As a full industry chain solutions provider for UHPC/GRC/GRG/GRP, Qinglong Group has always upheld the attitude of "meticulousness and the pursuit of excellence", perfectly integrating material performance with architectural aesthetics. Whether it is the lightweight texture of super high-rise curtain walls or the artistic forms of cultural landmarks, UHPC is using its unique advantages to drive the construction industry toward higher strength, better performance, and greater creativity. Choosing Qinglong means choosing not only high-quality materials, but also the technical assurance born of 28 years of professional expertise and a commitment to full life-cycle service.