What Is the Core Difference Between Standard and Economy UHPC in Performance Indicators? Performance Comparison and Selection Guide

Standard and economical UHPC are two product types developed for different project requirements. The core differences lie in performance indicators and raw material configuration. Accurately grasping the differences between the two and making selections based on project budget and performance requirements is the key to achieving optimal value for money. As an industry-leading manufacturer, Qinglong has summarized the core performance differences and applicable scenarios of the two product types based on extensive project practice.

I. Core Differences in Mechanical Performance Indicators

Compressive strength is the most significant point of difference. Standard UHPC has a characteristic cubic compressive strength ≥150MPa, with premium products reaching 180MPa, flexural strength ≥25MPa, and fracture energy ≥2500J/m², meeting high-end requirements such as complex shapes and load-bearing components; economical UHPC has a compressive strength ≥120MPa, flexural strength ≥20MPa, and fracture energy ≥2000J/m², meeting only basic performance requirements. Qinglong's test data shows that the impact resistance of standard UHPC is more than 30% higher than that of economical UHPC. In high-end projects such as the Century Plaza on Nanjing East Road in Shanghai, standard products support super-large special-shaped components, demonstrating excellent mechanical performance; economical products are suitable for low-load decorative components such as ordinary decorative lines and landscape benches.

II. Comparison of Durability Indicator Differences

The gap in durability indicators is significant. Standard UHPC withstands ≥300 freeze-thaw cycles, with mass loss rate ≤0.5%, chloride ion penetration coefficient ≤1×10⁻¹³m/s, and impermeability grade up to P30, making it suitable for harsh environments such as coastal and severely cold regions; economical UHPC withstands ≥200 freeze-thaw cycles, with mass loss rate ≤1%, chloride ion penetration coefficient ≤5×10⁻¹³m/s, and impermeability grade P20, suitable only for indoor or mild environments. In a coastal project in Hainan, standard UHPC components showed no obvious corrosion after 5 years of use, while economical components require regular maintenance; standard products also offer better carbonation resistance, with a 28-day carbonation depth ≤0.5mm compared to approximately 1.0mm for economical products, showing a significant difference in long-term stability.

III. Differences in Raw Material Configuration and Performance Support

The performance differences stem from different raw material configurations. Standard UHPC uses high-grade cement (Grade 52.5), high-purity quartz sand, imported steel fibers, and premium silica fume, with a fiber content of 2%-3% and optimized proportions of active admixtures to ensure high performance; economical products use Grade 42.5 cement, ordinary quartz sand, domestic steel fibers or polypropylene fibers, with a fiber content of 1%-2%, reduced silica fume usage, and increased proportions of low-cost admixtures such as fly ash. In production, Qinglong uses precise gradation and steam curing processes for standard products, while economical products can adopt steam-free curing processes to reduce costs. The differences in raw materials and processes directly lead to performance gaps, and also result in a 30%-50% price difference between the two.

IV. Selection Strategies and Practices Based on Performance Differences

For high-end landmark projects, bridge load-bearing components, and projects in coastal or severely cold environments, standard UHPC should be prioritized, as in projects such as Qinglong's Shanghai Astronomy Museum and the Shenzhen Pingshan High-tech Zone Comprehensive Service Center, to ensure long-term stability and safety; for ordinary commercial building decorative components, indoor low-load scenarios, and projects with limited budgets, economical UHPC can be selected, such as the UHPC decorative lines in a Qinglong municipal landscape project, where economical products met both aesthetic and basic performance requirements. For mixed-scenario projects, a "standard + economical" combined solution can be adopted, using standard UHPC for key load-bearing parts and economical UHPC for secondary decorative parts. Qinglong adopted this strategy in the Yangshengtang Pharmaceutical Hangzhou Industrial Park project to balance performance and cost. The core of selection is to match actual project needs, avoiding cost waste from excessively pursuing high performance, or sacrificing key performance due to cost control.