Analysis of UHPC's Main Raw Materials and the Approximate Proportion of Each Component

**Decoding UHPC Material Composition: The Core Components and Mix Proportioning Art of Ultra-High Performance Concrete**

Amid the wave of innovation in building materials, ultra-high performance concrete (UHPC), with its characteristics of being “as solid as rock and as thin as cicada wings,” has become the “ideal partner” for landmark buildings, high-end curtain walls, and complex designs. As an industry leader with 28 years of deep expertise in the UHPC/GRC/GRG/GRP field, Qinglong Group has always upheld the mission of “creating beautiful architecture.” Today, we take you through an in-depth analysis of UHPC’s raw material composition and scientific mix proportions, revealing the secrets behind its high performance.

**I. UHPC’s “Golden Combination”: An Analysis of the Four Core Raw Materials**

UHPC’s exceptional performance—compressive strength exceeding 150MPa and flexural strength exceeding 20MPa—stems from its precise material formulation. The core raw materials mainly include the following four categories:

**1. Cement-Based Cementitious Materials: The Cornerstone of Strength**
As the matrix of UHPC, cement-based materials are typically dominated by **high-strength Portland cement**, accounting for approximately 30%-40%. Some formulations incorporate **silica fume** (5%-10%) and **fly ash** (5%-15%), enhancing density and durability through a “synergistic hydration” effect. Qinglong Group adopts customized cement systems in production to ensure the activity and stability of the cementitious materials, providing components with a solid strength foundation.

**2. Fine Aggregates: The Code to Density**
UHPC abandons the coarse aggregates of traditional concrete and uses **quartz sand** or **emery** as the sole fine aggregate, accounting for approximately 25%-35%. Particle size is strictly controlled within 0.15-1.2mm, and through optimized gradation the particles fill the gaps between cementitious materials, forming a “pore-free” structure. For example, in the Nanjing East Road Century Plaza renovation project, Qinglong used quartz sand of a specific gradation, giving light-transmitting UHPC components both strength and light transmittance—an achievement that won an industry innovation award.

**3. Fiber Reinforcement: The Skeleton of Toughness**
**Steel fiber** is the “soul ingredient” of UHPC, accounting for approximately 2%-5% (by volume), with a typical length of 13-20mm. The fibers form a three-dimensional network within the material, effectively suppressing crack propagation and transforming UHPC from a “brittle material” into a “tough material.” Through its independently developed fiber dispersion process, Qinglong ensures uniform distribution of steel fibers and prevents agglomeration, further enhancing the impact resistance of components.

**4. Admixtures: The Performance Regulators**
Although admixtures account for less than 2%, they are vital to UHPC’s workability. **High-range water reducers** lower the water-binder ratio to 0.18-0.25, ensuring fluidity; **retarders** control the hydration rate to accommodate the casting of complex shapes; **defoamers** reduce air bubbles and improve density. Qinglong customizes admixture formulas according to different project requirements (such as long-span components and irregular curved surfaces), achieving a perfect balance between “fluidity and strength.”

**II. The Art of Scientific Mix Proportioning: From Laboratory to Engineering Practice**

UHPC mix proportions are not a simple piling up of materials but a precise calculation based on the “optimum packing density theory.” Take Qinglong’s standard formula as an example: 35% cement, 8% silica fume, 30% quartz sand, 3% steel fiber, 1.5% admixtures, with the remainder being water. This mix ratio requires hundreds of laboratory tests, adjusting aggregate gradation, fiber content, and admixture types, to ultimately meet the multiple engineering requirements for strength, toughness, and durability.

Notably, mix proportions must be dynamically adjusted for different application scenarios. For example, for **landscape components** (such as benches and sculptures), the steel fiber content can be appropriately reduced to optimize costs, while **high-rise building exterior wall panels** require a higher fiber proportion to ensure wind pressure and seismic resistance. As a national-level high-tech enterprise with a provincial R&D center, Qinglong can quickly customize formulas according to project requirements, achieving “customized performance.”

**III. Full-Chain Assurance: Quality Commitment from Raw Materials to Finished Products**

High-quality UHPC depends not only on scientific mix proportions but also on rigorous whole-process control. From raw material procurement (such as quartz sand with a purity above 99%), to mixing processes (planetary mixers ensuring uniform blending), to curing regimes (steam curing combined with natural curing), Qinglong has established a comprehensive quality control system. The company’s 600,000-square-meter production base is equipped with advanced testing equipment, and every batch of products must pass more than 20 indicator tests, including compressive strength, flexural strength, and freeze-thaw cycling, ensuring that only “premium components” are delivered to customers.

From domestic landmark projects to overseas projects in Southeast Asia, Qinglong UHPC, guided by the philosophy of “meticulousness and the pursuit of excellence,” has become a strategic partner of renowned enterprises such as Vanke and Poly. Looking ahead, Qinglong will continue to focus on innovation in UHPC/GRC/GRG/GRP materials, leveraging 28 years of full-chain experience to provide designers and owners with expert-level solutions, turning more “beautiful buildings” from drawings into reality.