What Are the Raw Materials of UHPC? Qinglong's UHPC Raw Material Selection and Quality Control Explained

The raw material composition of UHPC is highly specialized, mainly including cementitious materials, aggregates, fibers, admixtures, and water. Precise proportioning of each component is required to achieve ultra-high strength and excellent durability. As an industry benchmark with 28 years of deep expertise in the UHPC field, Qinglong Group has established strict raw material selection standards and a quality control system, ensuring stable product performance from the source.

I. Core Cementitious Materials: Foundation for Strength

High-grade cement: P.O 52.5 or above pure white cement is preferred, which must meet requirements such as high strength, low hydration heat, and good stability. Qinglong uses imported high-grade white cement to ensure UHPC matrix strength meets standards. Active mineral admixtures: mainly including silica fume, ultra-fine mineral powder, and fly ash. Silica fume must have a purity ≥92% and a specific surface area ≥15000m²/kg; it can fill cement hydration voids and improve compactness. Qinglong controls the silica fume content in UHPC at 10%-15% to optimize the matrix microstructure. Composite cementitious system: through the coordinated proportioning of cement and admixtures, a balance between strength and workability is achieved. Qinglong's patented composite cementitious formula enables UHPC compressive strength to stably exceed 120MPa, far above the industry average.

II. Key Aggregate Components: Core of Compactness Optimization

Ultra-fine quartz sand: high-purity quartz sand with a particle size of 0.1-1.2mm is selected, with SiO₂ content ≥99% and continuous, uniform particle gradation. Qinglong uses three-graded quartz sand with excellent filling effect to enhance UHPC compactness. Special aggregates: for functional requirements such as faux stone and faux wood finishes, natural colored sand, wood fiber, and similar materials can be added. In Qinglong's UHPC faux-wood translucent panel project for Shanghai New World, natural wood-grain aggregates were added to achieve realistic textured effects. Aggregate pretreatment: aggregates must undergo drying (moisture content ≤0.5%), sieving, and other treatments to prevent impurities and moisture from affecting performance. Qinglong's raw material pretreatment pass rate reaches 100%.

III. Reinforcing Fiber Materials: Key to Enhancing Mechanical Performance

Stainless steel fibers: straight-type stainless steel fibers with a diameter of 0.15-0.25mm and a length of 12-18mm are the mainstream choice, with tensile strength ≥2000MPa and a content of 2.0%-3.0%. Qinglong uses imported stainless steel fibers with good dispersibility, significantly improving UHPC flexural and impact resistance. Alkali-resistant glass fibers: alkali-resistant glass fibers can be selected for certain applications, which must meet an alkali resistance retention rate ≥85%. For decorative UHPC products, Qinglong optimizes the glass fiber blending scheme to balance strength and shaping flexibility. Fiber dispersion technology: dedicated dispersants and mixing processes are used to prevent fiber agglomeration. Qinglong adopts a step-by-step mixing method, achieving fiber dispersion uniformity of over 98%.

IV. Functional Admixtures and Water: Core of Workability Adjustment

High-range water reducer: polycarboxylate-based high-performance water reducer is selected, with a water reduction rate ≥35%, which can lower the water-binder ratio to 0.18-0.22. Qinglong customizes water reducer formulas to match its own cementitious system and improve mix fluidity. Other admixtures: defoamers, retarders, expansion agents, and more are added as needed. Defoamers reduce bubble defects, and retarders suit high-temperature construction. Qinglong precisely controls admixture content at 0.5%-2.0%. Mixing water: purified water or standard-compliant tap water is used, with Cl⁻ content ≤50mg/L, to prevent impurities from affecting the hydration reaction. All of Qinglong's production water is purified, with a water quality compliance rate of 100%.

Precise selection and proportioning of UHPC raw materials are the core guarantee of its high performance. Through strict raw material admission standards, precise proportioning, and pretreatment processes, Qinglong Group controls product quality at the source. Choosing a manufacturer with comprehensive raw material control capabilities is a key prerequisite for ensuring UHPC project performance meets standards.