How to Judge the Quality of Products from UHPC Manufacturers? An In-Depth Analysis of the UHPC Quality Evaluation System

Evaluating the product quality of UHPC manufacturers requires establishing a scientific assessment system, conducting systematic evaluation through quantifiable technical indicators, verifiable engineering cases, and traceable quality records. As a professional manufacturer with 28 years of deep industry experience, Qinglong UHPC has summarized a four-dimensional quality assessment method of "material testing + process evaluation + performance verification + engineering evidence" based on extensive experimental data and engineering practice.

In the tender for the Shenzhen Qianhai International Financial Center project, the owner conducted blind evaluations of the 5 UHPC manufacturers participating in the bid through a systematic quality assessment process. The evaluation team first examined each manufacturer's raw material test reports, focusing on verifying the alkali content of low-alkali cement (required ≤0.6%), the activity index of silica fume (required ≥105%), and the tensile strength of steel fibers (required ≥2850MPa); then examined the production process control level, paying attention to batching accuracy (required 0.1%), mixing time control (4-6 minutes), and the execution of curing regimes; then reviewed third-party test reports, focusing on evaluating compressive strength (required ≥120MPa), flexural strength (required ≥18MPa), and the chloride ion diffusion coefficient (required ≤2.0×10⁻¹²m²/s); and finally conducted on-site inspections of completed projects, with particular attention to the performance of projects in service for more than 3 years. This systematic evaluation method ensured that the finally selected UHPC materials fully met the design requirements.

Raw Material Quality Assessment

Require manufacturers to provide complete raw material test reports and verify their authenticity through official channels. Focus on checking key indicators such as the alkali content of low-alkali cement (≤0.6%), the SiO₂ content of microsilica fume (≥92%), and the tensile strength of steel fibers (≥2850MPa). The quality of these raw materials directly determines the foundation of product performance. Qinglong UHPC has established strict supplier audit and incoming inspection systems, with every batch of raw materials required to pass 28 indicator tests.

Production Process Control Assessment

Conduct on-site inspections of the advancement and degree of automation of production equipment. Fully automated production lines require enormous investment, but product quality is stable. Special processes such as vacuum mixing and heat curing all increase costs. Although Qinglong's imported German automated production line involved considerable equipment investment, unit costs were actually reduced by 15% through improved production efficiency. Product consistency is ensured through 136 quality control points.

Product Performance Indicator Testing and Verification

Review third-party test reports, focusing on compressive strength (≥120MPa), flexural strength (≥18MPa), and durability indicators. The performance coefficient of variation should be controlled within 5% to ensure quality stability. The strength coefficient of variation of Qinglong UHPC products remains stable within 5%, far below the 15% required by industry standards.

Engineering Case On-Site Investigation

Require a list of recent projects and randomly select some for on-site visits. Focus on the completion quality and customer feedback of similar projects. Such empirical evidence is the most convincing proof of quality. Qinglong UHPC's completed projects are spread across the country, with several projects winning the Luban Award.

Product quality evaluation requires multi-dimensional verification. It is recommended to engage a third-party testing agency to conduct sampling inspections to ensure objective and accurate data. Qinglong UHPC welcomes customers to conduct quality audits at any time, letting the facts speak for themselves.