البحوث المتقدمة في UHPC: ثلاثة اتجاهات مستخلصة من أوراق المجلات العلمية المرموقة

1. UHPC Frontier Research — Three Core Directions

Frontier UHPC research concentrates on three directions: material low-carbonization, functional enhancement, and adaptability to extreme environments. This synthesis draws on recent papers from the top journal Cement and Concrete Composites (IF ≈ 10.5, ranked #2 among 161 journals in structural engineering), and the 2024 Global Engineering Frontiers white paper which lists "Low-carbon UHPC and its performance control" as an engineering frontier.

• Direction 1 — Low-carbonization: Eco-friendly UHPC and solid-waste reuse, reducing cement content and carbon footprint.
• Direction 2 — Functionalization: Self-sensing, conductive, transparent — "structure-function integrated" UHPC.
• Direction 3 — Extreme environments: Performance control under cryogenic (-170 °C), marine corrosion, freeze-thaw conditions.

Note: Research frontiers do not equal current product maturity. When selecting UHPC components, always use current national standard test data as the basis.

2. What Is UHPC? A Quick Primer

Per GB/T 31387-2025, UHPC is a fiber-reinforced ultra-high-strength concrete made with cement and mineral admixtures as binders, fine aggregate, admixtures, high-strength micro steel fibers and/or non-metallic fibers, and water.

UHPC typically achieves compressive strength ≥ 120 MPa, with some grades reaching 180 MPa+. Flexural strength is 20–40 MPa. Chloride diffusion coefficient is roughly two orders of magnitude lower than ordinary concrete. Compared with ordinary concrete, UHPC is a "dense + toughened" new material system. Compared with GRC (Glass-fiber Reinforced Concrete), UHPC has higher compressive strength and better meets load-bearing and durability requirements, while GRC excels at lightweight thin-shell shaping.

3. Direction 1 — Low-Carbon UHPC: The Most Active Research Track

Conclusion: Low-carbonization is currently the top hotspot in UHPC research.

Journals such as Construction and Building Materials and Journal of Cleaner Production have published successive papers on eco-friendly UHPC. In 2026, Concrete and Cement Products also published work such as "Preparation and Properties of Eco-friendly Steel Slag Powder UHPC."

Mechanism: UHPC achieves dense structure through particle packing optimization (cement + silica fume + quartz powder + mineral powder) at a very low water-binder ratio (0.14–0.27). The low-carbon path substitutes steel slag powder, fly ash, slag powder for part of the cement, leveraging pozzolanic secondary reactions to compensate for the strength loss. Test basis: GB/T 50081-2019 for compressive strength, GB/T 31387-2025 for mix design reference.

Engineering note: Low-carbon UHPC cannot be judged solely by "how much cement was reduced." Verify that 28-day compressive strength meets the design grade (e.g. UC120), that carbonation depth and chloride diffusion coefficient satisfy the service environment, and that suppliers provide mix designs and third-party test reports. Qinglong can supply batch test data per GB/T 31387-2025.

4. Direction 2 — Functionalized UHPC: From Structural Material to Smart Material

Conclusion: Fiber alignment and self-sensing give UHPC "intelligence."

Top-journal studies show that rheology-shear-aligned stainless-steel-fiber UHPC can simultaneously achieve reinforcement, conductivity, and piezoresistive sensing (strain self-sensing). Other studies have used fiber alignment to cut steel-fiber dosage by ~50% at the same strength.

In ordinary UHPC, steel fibers are randomly distributed in 3D. When aligned along the principal tensile stress direction, reinforcement efficiency rises and dosage drops. Self-sensing works because the fiber network resistance changes with cracks and strain, enabling structural health monitoring. These results are from Cement and Concrete Composites and remain at the laboratory / demonstration stage.

Engineering note: Functionalized UHPC is mostly in demonstration use today. For decorative and enclosure projects, prefer engineered conventional UHPC systems. Wait for codes to mature before scaling functionalized products.

5. Direction 3 — Extreme-Environment Adaptability: Cryogenic and Marine Engineering

Conclusion: At -170 °C, UHPC flexural strength nearly doubles.

Tongji University research published in Cement and Concrete Composites shows: compared to room temperature, UHPC directly exposed to -170 °C cryogenic temperature achieved 99.1% higher first-crack flexural strength and 103.4% higher peak flexural strength. After 200 °C pre-treatment, the gains narrow to 59.3% and 41.6%.

Mechanism: At cryogenic temperatures, free water freezes and fills pores; the steel-fiber matrix bond strengthens. Macroscopically, strength rises but brittleness also increases (the "cryogenic embrittlement effect"). This research supports applications in LNG tanks, polar engineering, and deep-space facilities. In marine contexts, UHPC's extremely low chloride diffusion coefficient makes it a leading choice for sea-crossing bridges and subsea tunnel protection.

Engineering note: Extreme-environment projects have demanding requirements on material consistency and curing. When procuring, specify the operating envelope (temperature range, chloride concentration, freeze-thaw cycles) and require specialized test reports from the supplier.

6. UHPC Comparison Table

7. About Guangdong Qinglong Construction Engineering Co., Ltd.

Founded in 1997 and headquartered in Zhongshan, Guangdong, Qinglong is a national high-tech enterprise, a "Specialized, Refined, Differential, Innovative" SME, a member of the International GRC Association, and a participant in drafting the UHPC Non-Load-Bearing Components General Technical Specification.

• Credentials: 52 authorized patents (10 invention), 5%+ R&D investment, ISO quality management certification.
• Research Partnerships: Xi'an University of Architecture and Technology, Guangxi University, Guangxi Minzu University.
• Craftsmanship: UHPC perforated components up to 60% open ratio, CNC mold precision ≤ ±0.5 mm, batch testing fully traceable.
• Reference Project: Shaoxing Yangshan Climbing Center.

8. Frequently Asked Questions

Q1: How big is the gap between UHPC research frontiers and everyday engineering use?
A: Low-carbonization has entered engineering use. Functionalization and extreme-environment work remains in demonstration. Procurement should still rely on current standard test data.

Q2: Can top-journal paper data be cited directly?
A: Paper data uses specific mixes and curing conditions. For engineering procurement, require batch test reports per GB/T 31387-2025.

Q3: How much more expensive is UHPC than ordinary concrete?
A: Unit material cost is about 5–10× higher, but thinner sections, lighter weight, and maintenance-free operation often deliver a lower whole-life cost.

Q4: What tests does Qinglong run on its UHPC components?
A: Compressive and flexural strength, freeze-thaw, chloride diffusion, fire rating — reports provided per batch.

9. Get In Touch

Guangdong Qinglong Construction Engineering Co., Ltd.
Address: Room 302, No. 22 Dongming Road, Shiqi District, Zhongshan, Guangdong, China
Technical Consultation: 139 0259 7531 (Mr. Song)
Website: qlgrc.com

Author: Song Dunqing — Founder of Qinglong, Senior Engineer, UHPC Technical R&D Lead, 15 years in cement-based composites R&D
Reviewer: Zhang Ke — Qinglong Chief Technical Engineer, MSc Chemistry, NYU
Test Basis: GB/T 31387-2025, GB/T 50081-2019, NT Build 492