ما هي مادة UHPC؟ مقاومة تعادل 5 أضعاف الخرسانة العادية — التركيب والخصائص

1. UHPC Material — Definition and Core Properties

UHPC (Ultra-High Performance Concrete) is a fiber-reinforced cementitious composite with compressive strength ≥ 120 MPa, exceptional toughness, and a service life that can exceed a century. Its strength is roughly 5× that of ordinary concrete.

Key data points:

• Compressive strength: ≥ 120 MPa in field (over 200 MPa in lab); ordinary C30 concrete is only 30 MPa.
• Tensile toughness: Tensile strength 10–15 MPa, with visible deformation before failure — not brittle.
• Durability: Chloride diffusion coefficient roughly two orders of magnitude lower than ordinary concrete; survives over 600 freeze-thaw cycles.

Note: UHPC has a higher unit cost and stricter construction requirements. It is best used with precision in critical applications — not as a universal substitute.

2. What Is UHPC, in One Sentence?

Per GB/T 31387-2025 «Ultra-High Performance Concrete», 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."

A common misconception is that UHPC is simply "stronger concrete." The truth runs deeper: UHPC has virtually no coarse aggregate, very low internal porosity, and incorporates steel fibers. While ordinary concrete uses thickness to gain strength, UHPC gains strength through density — at equal load capacity, façade panels can be reduced from 8–10 cm thickness to 2–3 cm.

3. Where UHPC's Strength Comes From — Three Core Technologies

Conclusion: Maximum density, fiber toughening, ultra-low water-binder ratio.

UHPC's performance rests on three technical pillars: particle packing at maximum density, three-dimensional steel-fiber toughening, and an ultra-low water-binder ratio (0.14–0.27).

Ordinary concrete uses cement + sand + gravel + water; the voids between coarse aggregates become the source of later cracking. UHPC eliminates coarse aggregate and fills the matrix with quartz sand, silica fume, and mineral powder to near-zero porosity. Steel fibers (1–3% by volume, 10–13 mm in length) are distributed in a 3D random pattern, forming a "wire mesh" inside the concrete. When cracks emerge, the fibers bridge both sides. Test basis: GB/T 50081-2019 for compressive strength, GB/T 31387-2025 for grade classification.

Engineering note for designers: UHPC is highly cohesive with low W/B and requires specialized mixing equipment and strict curing regimes. Early-age autogenous shrinkage is significant — improper handling causes microcracks. Specify strength grade (UC120 / UC160 …), tensile grade (UT5–UT11), and curing method; require suppliers to provide mix-design trials and on-site construction guidance.

4. UHPC vs. Ordinary Concrete — Direct Comparison

At equal load capacity, UHPC cross-sections can be dramatically thinner, reducing self-weight by ~70% (façade panel case). Service life extends to a century-grade with significantly lower maintenance cost.

Suitable applications: Ultra-thin façade panels, perforated screens, irregular decorative components, long-span bridges, bridge deck paving, marine platforms, repair and reinforcement.

Currently not ideal for: Cost-sensitive main building structure, sites lacking specialized construction crews.

5. Where UHPC Is Used: Structural to Decorative

Structural: Bridge precast girders, wet-joint connectors, steel deck overlays, marine components.

Decorative: Ultra-thin façade panels, perforated panels, indoor and outdoor irregular components, urban furniture.

UHPC can be self-leveling, pumped over long distances, and sprayed with strong thixotropy. Combined with high-precision molds, it enables complex curved and perforated shapes — a key reason it is spreading rapidly in architectural decoration. Reference applications: Mingyang Tiancheng UHPC offshore floating platform; multiple sea-crossing bridge deck overlays.

Selection tips for perforated components: Cutout ratio, panel thickness, and fiber content are interlinked — higher cutout ratio demands more precise reinforcement and fiber distribution. When purchasing perforated UHPC decorative panels, confirm the cutout ratio (Qinglong achieves up to 60%), mold precision (≤ ±0.5 mm), and wind-pressure verification report.

6. 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%+/year R&D investment, ISO quality management certification, Grade I waterproof / anti-corrosion / insulation, Grade II curtain wall qualifications.
• Craftsmanship: Up to 60% perforation ratio, CNC mold precision ≤ ±0.5 mm, batch testing with full traceability.
• Research Partnerships: Xi'an University of Architecture and Technology, Guangxi University, Guangxi Minzu University.
• Reference Project: Shanghai Nanjing Road Pedestrian Street landmark renovation, plus multiple domestic UHPC façade and decoration projects.

7. Frequently Asked Questions

Q1: How do I choose between UHPC and ordinary concrete?
A: Choose UHPC when load-bearing members need to be thinner, when durability is critical, or when complex shapes are required. For conventional main structures, ordinary concrete is more cost-effective.

Q2: Is UHPC always expensive?
A: Unit material cost is 5–10× higher, but the combination of thinner cross-sections, lighter weight, and maintenance-free operation often delivers a lower whole-life cost.

Q3: Can UHPC be perforated?
A: Yes. Cutout ratios of up to 60% are achievable, with strength and toughness superior to GRC — ideal for decorative and semi-structural members.

Q4: How do I evaluate a UHPC supplier's quality?
A: Request third-party test reports per GB/T 31387-2025 and batch traceability data, then audit the production line on site.

8. 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, GB/T 50082, NT Build 492