What Raw Materials Make Up UHPC and What Are the Approximate Proportions of Each Component: Analysis of Ultra-High Performance Concrete Raw Material Composition and Mix Ratios

Ultra-High Performance Concrete (UHPC), as a revolutionary material in the field of new architectural decorative materials, owes its outstanding performance to the perfect combination of scientifically rigorous raw material proportions and advanced processes. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will analyze the composition of UHPC raw materials and the secrets of its mix proportions from a professional perspective, providing an authoritative reference for designers and owners.

I. UHPC Core Raw Material System: Four Components Build Ultra-High Performance

The UHPC raw material system mainly consists of four major parts: cementitious materials, aggregates, fibers, and admixtures, with each component working synergistically to form a dense microstructure. Among them, cementitious materials account for approximately 40%-50%, usually based on Portland cement, blended with active admixtures such as silica fume (10%-15%), fly ash, or slag (5%-10%), improving system compactness through the "synergistic hydration effect." The customized cementitious system adopted at Qinglong Group's Nanning production base, optimized through more than 2,000 tests, enables the material's compressive strength to stably exceed 150MPa.

II. Aggregate Gradation Technology: Micron-Level Control Achieves Dense Packing

Aggregates, serving as the skeletal component, account for 30%-40%. Unlike traditional concrete, UHPC uses continuously graded quartz sand (0.15-2.36mm), optimizing particle gradation through the Dinger-Funk equation to achieve a tight packing density of over 70%. Qinglong's R&D center innovatively introduced nano calcium carbonate (1%-3%) to fill microscopic pores, combined with a dedicated superplasticizer (0.8%-1.2%), bringing the spread of fresh concrete to over 750mm to meet the casting requirements of complex-shaped components.

III. Fiber Reinforcement System: The Key Reinforcing Phase Determines Mechanical Properties

Steel fibers or composite fibers are the core of UHPC's high toughness, typically accounting for 2%-5% (by volume fraction). Qinglong's flagship copper-plated micro steel fibers (length 13-20mm, diameter 0.2-0.3mm) feature a hooked-end design, increasing the fiber-matrix interfacial bond strength by 40%, giving the material a flexural strength exceeding 25MPa and a fracture toughness of over 30kJ/m². For special scenarios, PVA fibers or basalt fibers can also be combined to form a multi-component reinforcement system.

IV. Mix Proportion Optimization Principles: The Golden Rule of Balancing Performance and Economy

Scientific mix proportions must balance strength, workability, and cost control. Qinglong's technical team has summarized the "Three-High, Three-Low" mix proportion principle: high cementitious material content, high fiber dosage, and high proportion of active admixtures; low water-binder ratio (0.18-0.25), low fluctuation in sand ratio (38%-42%), and low content of harmful impurities. Taking Qinglong's UHPC exterior wall panels as an example, the typical mix proportion is: cement 35%, silica fume 12%, quartz sand 38%, steel fiber 3%, admixture 1%, and water 11%. After steam curing at 120°C, the 28-day strength can reach 180MPa.

As a national high-tech enterprise and a participant in setting UHPC industry standards, Qinglong Group has always regarded raw material R&D as its core competitiveness, establishing a full-process quality control system from mine material selection to finished product testing. Its intelligent production line with an annual capacity of 600,000 square meters can precisely control the component error of each cubic meter of UHPC material within ±1%, ensuring stable material performance for high-end projects such as grand theaters and commercial complexes. Choosing Qinglong UHPC means choosing quality assurance backed by 28 years of professional expertise.