What is the compressive and flexural strength of Guangdong Qinglong's UHPC panels? Can they be made into hollowed-out or irregular curved shapes?

In the construction industry, UHPC (Ultra-High Performance Concrete) has moved from the laboratory into reality. More and more designers and owners are asking the same question: How strong is this material really? Can those intricate hollow-out and curved designs actually be made?

Based on third-party test data and real project cases, I will answer these two core questions with objective data.

1. Compressive Strength: Up to 220MPa, 7 Times That of Ordinary Concrete

UHPC is called "ultra-high performance" first and foremost because of its compressive strength.

According to the industry standard "Ultra-High Performance Concrete (UHPC) Exterior Wall Panels", the standard compressive strength requirement for UHPC is ≥120MPa. Qinglong's UHPC products have a regular compressive strength that consistently stays in the 120-180MPa range.

Specific measured data:

· Shenzhen Yirui Biotechnology Building Project: Third-party testing showed that Qinglong UHPC curtain wall panels achieved a 28-day compressive strength of 135MPa, fully meeting the extreme performance requirements for curtain wall materials in super high-rise buildings in strong typhoon zones

· Hainan International Convention and Exhibition Center Project: Measured compressive strength in actual application reached 158MPa

· Higher-Performance Custom Products: Through an optimized cementitious material system and high-pressure forming process, Qinglong's independently developed UHPC formula has been verified by third-party testing to consistently exceed 220MPa in compressive strength

For comparison: ordinary C30 concrete has a compressive strength of about 30MPa. This means Qinglong UHPC's compressive strength is 4 to 7 times that of ordinary concrete. Under the same load conditions, UHPC components can be made thinner and lighter while offering greater load-bearing capacity.

In terms of quality stability, Qinglong products have a strength dispersion coefficient controlled within 5%, far better than the industry requirement of 8%. This means every panel in the same batch delivers highly consistent performance, with no "some good, some poor" variations.

2. Flexural Strength: 25-35MPa, with Toughness 5-8 Times That of Ordinary Concrete

Thin-walled components such as exterior wall cladding panels and sunshades place even higher demands on flexural (bending) performance than on compressive performance—panels bend under wind loads, and insufficient flexural strength leads to cracking or even fracture.

Qinglong UHPC measured flexural strength data:

· Regular products: Flexural strength stable at 20-28MPa

· Shenzhen Yirui Biotechnology Building Project: Third-party tested flexural strength of 25MPa

· For high-rise projects: Qinglong UHPC panels for high-rise buildings achieve flexural strength ≥35MPa

· Laboratory limit: With optimized formulations, bending strength can exceed 35MPa

By comparison, ordinary concrete typically has a flexural strength of only 3-5MPa. Qinglong UHPC's flexural performance is 5-8 times that of ordinary concrete.

By adding stainless steel fibers (2.5%-3% by volume), Qinglong gives the material a "pseudo-strain hardening" behavior under bending failure—multiple fine cracks appear instead of sudden fracture, with flexural toughness up to more than 200 times that of ordinary concrete. This means even under extreme loads, panels will not fail in brittle fracture, offering greater safety.

In terms of elastic modulus, Qinglong UHPC is stable at 40-55GPa—high stiffness and low deformation under load, which is crucial for controlling wind-induced vibration deformation in high-rise buildings.

3. Can It Be Made into Hollow-Out Designs? Openwork Ratio Up to 60%

The answer is yes. Qinglong is not only mature in regular UHPC panel technology, but also has extensive real-world validation in high openwork ratio components.

The core technical challenge of high openwork UHPC (openwork ratio ≥50%) lies in: how to maintain structural strength and safety while "hollowing out" a large amount of material. Qinglong achieved this through four key technical breakthroughs:

Structural optimization: Openwork patterns are optimized through parametric modeling, retaining the core load-bearing skeleton (width ≥50mm) to avoid stress concentration. Finite element analysis software is used to simulate load conditions and optimize the position and size of openings. Hidden stiffening ribs (thickness ≥10mm) are set at the edges and corners of openwork areas, formed integrally with the main body.

Mold design: High-precision molds are made using 3D scanning + CNC engraving technology, with accuracy ≤±0.5mm. Assembly error between segmented molds is ≤±0.3mm, and openwork edges are smooth with no chipping after demolding.

Fiber distribution: 12-15mm stainless steel fibers are selected with a volume content of 2.5%-3%, achieving a distribution uniformity of 98%.

Forming and curing: A 0.2-0.3MPa high-pressure grouting process achieves 99.5% compaction in openwork areas. Intelligent steam curing (50-60°C, 12-16 hours) ensures 7-day strength reaches 80% of design strength.

Real project validation:

· Ouargla Hotel, Algeria: Qinglong supplied 50mm-thick UHPC openwork panels with an openwork ratio exceeding 50%. A grid-like skeleton design kept compressive strength at 150MPa and bending strength ≥22MPa; wind pressure testing fully met exterior wall application requirements

· Shanghai New World Century Plaza on Nanjing East Road: UHPC wood-grain translucent panels with 50% openwork ratio; single panels measure up to 12㎡ and weigh over 700kg, safely hoisted thanks to high strength

· A commercial complex project in Nanning: 3,000㎡ of openwork UHPC sunshade panels, with overall costs reduced by 22%

Qinglong has achieved stable mass production of openwork panels with ratios up to 60%. Openwork patterns can be customized as required—geometric shapes, cultural symbols, and natural elements are all possible.

4. Can It Be Made into Curved Shapes? Minimum Curvature Radius Within 300mm

Again, yes. UHPC's exceptional plasticity makes it the material of choice for irregular curved building skins.

Using a parametric design platform (Rhino+Grasshopper) combined with BIM technology, Qinglong achieves precise modeling of complex curved surfaces, with the minimum curvature radius controllable within 300mm. This means the streamlined curves and free-form sculptures designed by architects can be accurately realized.

Real project validation:

· Guangxi New Media Center: The double-curved UHPC exterior wall panels built by Qinglong feature no two identical panels, with 99% fidelity to the double-curved design, becoming a new landmark of Nanning

· Shanghai Astronomy Museum: UHPC double-curved panels with precision controlled within ±2mm

· Hainan Poly Peninsula No.1: 12,000㎡ of UHPC special-shaped double-curved panels located in a coastal high-salt-spray environment; after 8 years of use, no corrosion or cracking

· Dongguan Women and Children's Activity Center: Double-curved special-shaped components perfectly realized through BIM pre-assembly technology

· A provincial-level grand theater: The double-curved special-shaped sunshade system built with Qinglong UHPC achieves openwork designs with 30% light transmission through fiber weaving technology, while modular production processes improved on-site installation efficiency by 50%

It is worth mentioning that through a "parametric mold design + modular production" model, Qinglong breaks irregular components down into combinations of standardized modules and customized nodes, increasing mold reuse rates by more than 40%. Take a double-curved curtain wall project at a cultural center as an example: a single mold set can produce 12 types of components with different curvatures, directly reducing mold costs by 35%.

5. Data Summary and Strength Credentials

Qinglong's Strength Credentials:

· 28 Years of Industry Experience: Founded in 1997, with deep technical expertise accumulated in the UHPC/GRC field

· 58 Patented Technologies: Covering material formulations, production processes, installation techniques, and more

· 600,000㎡ Annual Capacity: Smart production base in Nanning, Guangxi, equipped with fully automated production lines

· Standard Setter: Participated in drafting industry standards such as "General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components"

· Benchmark Project Validation: Wuhan Han Show Theatre (10+ years with zero repairs), Shenzhen Pingshan High-tech Zone Comprehensive Service Center (Luban Award), Shanghai Century Plaza (Silver Award of UHPC Construction Engineering Innovation Award), etc.