Analysis of How UHPC Mix Proportion Differences Among Manufacturers Are Mainly Reflected in Raw Material Selection, Mineral Admixture Ratios, and Admixture Usage

The exquisite balance of UHPC mix proportions is a perfect fusion of materials science and engineering artistry, and the core code that determines building quality.

In the field of construction materials, ultra-high performance concrete (UHPC), with its outstanding mechanical properties and design freedom, is becoming the material of choice for landmark buildings, high-end curtain walls, and other applications. However, differences in UHPC mix proportions among manufacturers are like a "formula code," directly affecting material performance, construction efficiency, and engineering quality. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group will analyze the core logic behind mix proportion differences from three dimensions—raw material selection, mineral admixture ratios, and admixture usage—providing professional reference for designers and owners.

I. Raw Material Selection: The Foundational Differences in UHPC Quality

Differences in UHPC mix proportions are first reflected in the "genetic selection" of raw materials. High-quality UHPC must be based on high-strength cement, ultra-fine silica fume, and specifically graded quartz sand, and each manufacturer's standards for raw material control directly determine the starting point of the mix proportion. For example, at its Nanning production base, Qinglong Group uses low-alkali cement of grade 52.5 or above and screens quartz sand with SiO₂ content ≥95%, ensuring matrix compactness through strict particle grading control (0.15–0.6mm accounting for 60%). By contrast, some manufacturers use ordinary Portland cement and high-impurity aggregates, resulting in significant differences in strength (compressive strength can differ by up to 30MPa) and durability (impermeability differing by 2–3 grades). Behind this difference lies Qinglong's twenty years of accumulation in raw material supply chains as a national high-tech enterprise—from Malaysian sand sources to German-imported silica fume, full-chain quality control lays the foundation for mix proportion optimization.

II. Mineral Admixture Ratios: The "Golden Ratio" of Performance Tuning

Mineral admixtures are the "performance regulators" of UHPC mix proportions, and differences in their types and ratios directly affect the material's workability and mechanical properties. In its UHPC mix design, Qinglong adopts a silica fume–fly ash–slag powder "ternary composite system," determining the optimal dosages through orthogonal testing (silica fume 15% + fly ash 10% + slag powder 5%), which not only solves the insufficient fluidity caused by single admixtures, but also pushes compressive strength beyond 150MPa through the "micro-aggregate filling effect." By contrast, some manufacturers, in order to reduce costs, add only silica fume or use excessive fly ash, leading to problems such as low early strength (7-day strength below 80MPa) and increased risk of drying shrinkage cracking. As an enterprise that participated in drafting the standard "General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components," Qinglong understands that admixture ratios must balance strength, toughness, and economy—which is precisely the technical confidence behind its undertaking of benchmark projects such as the translucent concrete project at Century Plaza on Nanjing East Road.

III. Admixture Usage: The "Efficiency Catalyst" of the Mix Proportion

Admixtures are the "invisible engine" of UHPC mix proportions, and differences in their selection and dosage determine the material's construction adaptability and performance stability. Qinglong uses its self-developed polycarboxylate high-performance water reducer (water reduction rate ≥35%), compounded with defoamers and thickeners, achieving a 300mm spread even at an ultra-low water-binder ratio of 0.18, meeting the casting requirements of complex-shaped components. By contrast, some manufacturers use general-purpose water reducers and have to raise the water-binder ratio above 0.25 to ensure fluidity, directly causing a 15%–20% strength loss. In practical projects, this difference manifests as follows: Qinglong UHPC components can be formed in a single pass into double-curved curtain wall panels (minimum radius of curvature ≤300mm), while similar products may suffer from honeycombing and pitted surfaces due to insufficient fluidity. As a technology-driven enterprise holding 58 patents, Qinglong's breakthroughs in admixture compounding technology enable its mix proportions to maintain stable performance even in extreme environments (such as the high-temperature, high-salinity regions of Saudi Arabia).

Differences in UHPC mix proportions among manufacturers are, in essence, a comprehensive reflection of technical strength, engineering experience, and quality philosophy. Supported by 28 years of full-chain experience, Qinglong Group transforms mix proportions into engineering value through rigorous raw material selection, scientific proportioning, and technological innovation—from the innovative GRC application at the Dongguan Women and Children's Activity Center to UHPC components exported overseas, every project is a practical testament to mix proportion optimization. For designers and owners, choosing a UHPC manufacturer is not just choosing a material, but choosing the technical system and quality commitment behind it. Looking ahead, Qinglong will continue its mission of "creating aesthetically beautiful architecture," driving the iterative upgrading of UHPC mix proportion technology and providing more competitive solutions for the architectural decoration field.