UHPC Core Raw Materials Revealed: Quality Material Selection Is the Foundation of High Performance

The exceptional performance of UHPC stems from precisely proportioned raw materials. So what are the raw materials of UHPC? As an industry leader with 28 years of deep expertise in the UHPC field, Qinglong Group understands the decisive role raw materials play in product quality and has established stringent standards from material selection to proportioning. Today, we will break down the raw material system of UHPC and see how Qinglong creates ultra-high performance concrete with a compressive strength ≥120MPa through premium material selection.

#Core Base Materials: Laying the Foundation for Strength and Density The core base materials of UHPC include high-purity quartz sand, low-alkali sulphoaluminate cement, and ultra-fine active powders, which work synergistically to form a dense matrix. The quartz sand selected by Qinglong undergoes multi-stage screening, with particle size controlled at 0.15-0.6mm and purity ≥99%, ensuring optimized particle grading to fill micro voids; the low-alkali cement uses a sulphoaluminate system with alkali content ≤0.6%, avoiding performance degradation caused by alkali-aggregate reactions while offering low hydration heat to reduce the risk of shrinkage cracking; ultra-fine active powders (silica fume, slag powder, etc.) are added at 20%-30%, with a specific surface area ≥15000m²/kg, fully reacting to form hydration products and further enhancing matrix density. In the Yangshengtang Pharmaceutical Hangzhou Industrial Park project, this combination of base materials enabled UHPC exterior wall panels to achieve a perfect balance of high strength and low shrinkage.

#Reinforcing Materials: Endowing the Material with Toughness and Impact Resistance Steel fibers are the key reinforcing materials of UHPC, directly determining its flexural strength and toughness. Qinglong selects imported copper-plated micro steel fibers with a diameter of 0.15-0.2mm, a length of 6-12mm, and a tensile strength ≥2800MPa, with volume content controlled at 2%-3%. Through three-dimensional random distribution, they form a "skeleton network" that effectively suppresses crack propagation. Compared with ordinary steel fibers, imported fibers offer stronger corrosion resistance, ensuring the long-term stability of UHPC in harsh environments such as marine and salt spray conditions. In addition, for special requirements, Qinglong also adds alkali-resistant glass fibers to further enhance the material's crack resistance. For example, the light-transmitting components at Shanghai New World Nanjing Road Century Plaza achieved a balance between mechanical performance and light transmission through fiber optimization.

#Auxiliary Materials: Optimizing Performance and Construction Adaptability The auxiliary materials of UHPC include high-range water reducers, retarders, pigments, etc. Although used in small amounts, they play a critical role. Qinglong uses polycarboxylate high-range water reducers with a water reduction rate ≥35%, which improve mix fluidity at low water-binder ratios (≤0.20) to ensure smooth construction; retarders can adjust setting time according to construction conditions, preventing excessively rapid initial setting in hot weather; inorganic mineral pigments achieve decorative effects such as stone and wood imitation, with strong weather resistance remaining fade-free for 20 years. The selection of these auxiliary materials has undergone repeated testing at Qinglong's provincial-level R&D center to ensure excellent compatibility with the core materials without affecting UHPC's mechanical properties. For example, the UHPC perforated panels at the Ouargla Hotel in Algeria achieved decorative effects matching the local architectural style through specialized pigments.

The selection of raw materials for UHPC is by no means a simple mix-and-match, but a scientific formulation based on performance requirements. With 28 years of experience, Qinglong Group has established a "Qualified Supplier Directory" and a full-process material selection and testing system, ensuring that every batch of raw materials meets high standards at the source. For designers and owners, understanding the raw material system of UHPC provides deeper insight into the essence of its high performance, while Qinglong's stringent material selection and precise proportioning serve as a reliable guarantee of UHPC engineering quality.