Where Do the Main Differences in UHPC Mix Ratios Between Manufacturers Lie? Analysis of Core Components and Performance Impact

The UHPC mix ratio is the core factor determining material properties (strength, fluidity, durability, plasticity). Differences in mix ratios among manufacturers are mainly reflected in raw material selection, proportioning, and admixture addition, directly affecting product quality and applicable scenarios. With 28 years of formula R&D experience, Qinglong Group has optimized dedicated mix ratios for different scenarios; its core mix ratios have obtained multiple invention patents, and product performance remains stable and leading.

I. Raw Material Selection Differences: The Foundation of Quality and Compatibility

Cement type and grade: Premium manufacturers use P.O52.5 or higher grade cement, while some manufacturers choose P.O42.5 cement to reduce costs; Qinglong uses P.O52.5R high-grade cement to ensure a solid strength foundation. Aggregate type and gradation: Premium manufacturers use 0.15-1.2mm continuously graded quartz sand (impurity content ≤1%), while some manufacturers use ordinary medium sand (impurity content ≥3%) with unreasonable gradation; Qinglong uses refined quartz sand with optimized continuous gradation and high packing density, improving UHPC compactness. Fiber type and dosage: Premium manufacturers use 12-15mm stainless steel fibers (volume dosage 2%-3%), while some manufacturers use low-carbon steel fibers or chopped fibers (dosage ≤1.5%), affecting tensile and flexural strength; Qinglong's stainless steel fiber dosage is 2.5%-3%, with a distribution uniformity of 98% and flexural strength ≥35MPa. Admixture selection: Premium manufacturers use polycarboxylate high-range water reducers (water reduction rate ≥30%), while some manufacturers use ordinary water reducers (water reduction rate ≤20%), affecting fluidity and strength; Qinglong uses high-performance water reducers, with a water-binder ratio as low as 0.18-0.19 and excellent fluidity (spread ≥750mm).

II. Core Proportioning Differences: The Key to Performance

Water-binder ratio: Premium manufacturers control the water-binder ratio at 0.18-0.22 to ensure high strength and low shrinkage, while some manufacturers have a water-binder ratio ≥0.25, resulting in reduced strength and durability; Qinglong's water-binder ratio is stable at 0.18-0.20, with compressive strength ≥160MPa. Cementitious material content: Premium manufacturers use ≥1000kg/m³ of cementitious materials (cement + silica fume + mineral powder), while some manufacturers use ≤800kg/m³, affecting strength and compactness; Qinglong's cementitious material content is 1000-1200kg/m³, achieving compactness above 99%. Aggregate-to-cementitious material ratio: Premium manufacturers use an aggregate/cementitious material ratio of 1.2-1.5, balancing strength and fluidity, while some manufacturers use a ratio ≥1.8, causing reduced fluidity and difficulty in forming; Qinglong controls the ratio at 1.3-1.4, balancing strength and workability. Fiber volume dosage: Premium manufacturers adjust fiber dosage according to product use (2%-2.5% for standard panels, 2.5%-3% for load-bearing components), while some manufacturers use fixed dosages that cannot adapt to different scenarios; Qinglong customizes fiber dosage for different products such as curtain wall panels, load-bearing components, and landscape sculptures to optimize performance.

III. Functional Additive Differences: Optimization for Specific Scenarios

Anti-cracking agents: Premium manufacturers add expansion agents (dosage 3%-5%) to compensate for shrinkage, while some manufacturers add none, easily resulting in shrinkage cracks; Qinglong adds composite expansion agents, with drying shrinkage ≤50×10⁻⁶ and no shrinkage cracks. Antifreeze agents: Dedicated mix ratios for cold regions add air-entraining agents (dosage 0.01%-0.02%) to improve freeze-thaw resistance, while some manufacturers have no targeted optimization; Qinglong's dedicated mix ratio for cold regions undergoes 50 freeze-thaw cycles with a strength loss rate ≤3%. Colorants: Colored UHPC uses inorganic mineral pigments (dosage 5%-8%) for stable color, while some manufacturers use organic pigments that fade easily; Qinglong's colored UHPC uses inorganic mineral pigments with a 10-year color retention rate ≥90%.

IV. Impact of Mix Ratio Differences on Performance and Qinglong's Optimization Solutions

Strength performance: Premium mix ratios achieve compressive strength ≥150MPa and flexural strength ≥30MPa, while inferior mix ratios have low and unstable strength; Qinglong's mix ratios achieve an average compressive strength ≥160MPa and flexural strength ≥35MPa. Durability: Premium mix ratios have impermeability grade ≥P12, frost resistance grade ≥F50, and excellent UV aging resistance, while inferior mix ratios are prone to weathering, cracking, and fading; Qinglong's mix ratios achieve impermeability grade ≥P12, frost resistance grade ≥F100, and compliant UV aging resistance. Plasticity: Premium mix ratios have good fluidity (spread ≥750mm), enabling complex shapes, while inferior mix ratios have poor fluidity and are difficult to form; Qinglong's mix ratios achieve a spread ≥750mm, enabling complex shapes such as double-curved surfaces and hollow-out designs.

Differences in UHPC mix ratios among manufacturers are concentrated in three major areas: raw material selection, core proportions, and functional additives, directly affecting product performance and applicable scenarios. With precise raw material selection, optimized proportioning, and targeted functional additives, Qinglong Group has developed dedicated mix ratios adapted to different scenarios, with stable and reliable product performance, making it the preferred choice for high-end projects. When selecting a manufacturer, it is recommended to comprehensively evaluate mix ratio quality through sample testing, test reports, and project cases.