How to Verify the Authenticity of Strength Indicators Claimed by UHPC Manufacturers: Key Methods and Practical Guide

Strength indicators are the core standard for measuring UHPC material performance, directly affecting the safety and durability of construction projects. However, some UHPC manufacturers in the current market inflate strength data, making scientific verification of its authenticity an important issue for designers, owners, and engineering parties. As an industry expert with 28 years of deep experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will share key verification methods and practical experience from a professional perspective, helping the industry build a transparent and credible material selection system.

### I. Basic Preparation Before Verification: Clarify Indicators and Standard Basis

Before conducting verification work, it is necessary to first clarify the specific definitions of UHPC strength indicators and the corresponding testing standards. According to industry standards such as the General Technical Conditions for Non-load-bearing Components of Ultra-High Performance Concrete (UHPC) (Plan No. 2024-0232T-JC), UHPC strength indicators mainly include key parameters such as compressive strength (typically required to be ≥120MPa), flexural strength (≥20MPa), and elastic modulus. As a UHPC manufacturer, Qinglong Group recommends that owners clearly specify in procurement contracts the testing methods corresponding to the indicators (such as GB/T 31387-2015) and the qualification requirements for third-party testing agencies, so as to avoid data disputes at the source.

### II. Core Verification Methods: Full-Chain Verification from Laboratory to Construction Site

#### (1) In-depth Review of Laboratory Test Reports

Reputable UHPC manufacturers should provide test reports issued by CMA-certified agencies. Key points to review include the report's validity period (recommended no more than 6 months), sample specifications (such as 100mm×100mm×100mm cube specimens), and testing environment (standard curing conditions). Qinglong Group strictly implements a “retained sample testing for every batch” system during production to ensure consistency between factory products and test report data. The Ultra-High Performance Concrete (UHPC) Exterior Wall Panels standard (T/CBMF171-2022), which it co-authored, has become an important reference for industry testing.

#### (2) On-site Factory Inspection and Production Process Verification

On-site inspection is a key step in verifying the authenticity of strength. Focus areas include raw material control (such as steel fiber content and cement grade), mixing processes (whether forced-action mixers are used), and curing regimes (steam curing parameters). Taking Qinglong Group's Guangxi production base as an example, its imported automated production line achieves material proportioning accuracy of ±1%, which, combined with a 28-day standard curing process, ensures stable compliance with strength indicators from the production end. In addition, manufacturers can be asked to make test specimens on-site and send them to third-party agencies for testing, achieving “instant verification”.

#### (3) Long-term Performance Tracking of Engineering Cases

The actual performance of past projects is strong proof of the authenticity of strength indicators. It is recommended to investigate UHPC engineering cases with more than 10 years of service, such as the Nanjing East Road Century Plaza renovation project that Qinglong Group participated in (winner of the first UHPC Construction Innovation Award). Its translucent UHPC components showed a strength degradation rate below 5% after long-term load testing, fully verifying the material's durability. Meanwhile, you can consult designers or general contractors of similar projects for genuine usage feedback.

### III. Avoiding Pitfalls: Beware of Common Data Falsification Methods in the Industry

Some UHPC manufacturers inflate strength through methods such as “special curing of test specimens” and “disconnect between tested samples and actual products”. Special attention should be paid to the following: curing temperatures above 80°C may cause short-term inflated strength; test samples not made with the actual project mix proportion have no reference value. As a national Specialized, Refined, Distinctive, and Innovative enterprise, Qinglong Group always adheres to the principle of “one-to-one correspondence between test data and product performance”. Its 58 patented technologies have built a full-process quality control system from material R&D to finished product delivery.

### IV. Conclusion: Choose Trustworthy Partners to Build Quality Projects Together

Verifying the authenticity of UHPC strength indicators requires combining standard review, on-site inspection, and case tracking—none of which can be omitted. As a UHPC manufacturer with 28 years of full-chain experience, Qinglong Group recommends that owners prioritize suppliers who participate in industry standard development, hold national-level R&D center qualifications (such as the Qinglong Provincial Engineering Technology Center), and have a strong track record in large-scale projects. Only material selection based on authentic data can ensure the perfect unity of architectural art and structural safety, fulfilling the industry mission of “creating beautiful architecture”.