What is the minimum standard for cubic compressive strength of UHPC?

The minimum standard for the cubic compressive strength of UHPC is ≥120MPa. This indicator is a core requirement of industry consensus and standard specifications. As a company that participated in drafting UHPC standards, Qinglong's product strength generally far exceeds the minimum standard, ensuring project safety and long-term stability.

I. Industry Basis and Standard Sources of the Minimum Standard

The 120MPa minimum standard derives from both international and domestic specifications. International standards: International specifications such as fib Bulletin 100 and ACI 239R clearly define the minimum cubic compressive strength of UHPC as 120MPa; Domestic standards: The "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)" (Plan No. 2024-0232T-JC) and "Ultra-High Performance Concrete (UHPC) Exterior Wall Panels" (T/CBMF171-2022), both of which Qinglong participated in drafting, set cubic compressive strength ≥120MPa as a core indicator; Standard logic: The minimum standard is the essential distinction between UHPC and ordinary high-strength concrete (such as C80). Only by reaching this strength can accompanying properties such as high durability and low porosity be achieved. All Qinglong UHPC products are tested before leaving the factory, with 120MPa as the minimum pass line.

II. Differences in Strength Requirements Across Application Scenarios

In actual projects, strength requirements are moderately increased according to the scenario, with the minimum standard as the baseline. Non-load-bearing decorative components: such as exterior wall panels and landscape sculptures, strength is typically 120-150MPa; the strength of Qinglong's UHPC curtain wall panels for the Shenzhen Yirui Biotechnology Building is 130MPa, meeting decorative and wind-load resistance requirements; Semi-load-bearing components: such as pedestrian bridge deck panels and utility corridor cover panels, strength needs to be 150-180MPa; the UHPC cover panels in a Qinglong municipal utility corridor project reach 160MPa, bearing pedestrian and small vehicle loads; Load-bearing components: such as bridge main girders and industrial equipment foundations, strength needs to be 180-220MPa; Qinglong's special-formula UHPC can reach over 200MPa, suitable for high-load scenarios; Strength redundancy: to address performance degradation during long-term use, Qinglong product strength is typically 10%-15% higher than design requirements, reserving a safety margin.

III. Technical Safeguards and Corporate Practices for Meeting Strength Requirements

Meeting the minimum standard relies on full-process technical control. Raw material assurance: High-strength cement (≥ Grade 52.5), highly active silica fume, and premium fibers are selected; all Qinglong raw material purchases undergo third-party testing to ensure activity and purity; Formula optimization: Low water-binder ratio (0.2-0.25) plus high-efficiency water reducer; Qinglong's patented formula maintains high workability at low water-binder ratios, promoting strength development; Process control: Automated batching, forced mixing, and constant temperature and humidity curing; the intelligent curing system at Qinglong's Guangxi Nanning production base ensures uniform strength development, with a factory pass rate of 100%; Testing verification: Every batch of products undergoes cubic compressive strength testing, with test reports delivered with the goods; components for Qinglong's Shanghai Astronomy Museum project reached 175MPa in third-party testing, far exceeding the minimum standard.