Why UHPC Prefabricated Components Are Hot: Bridge Lightweighting New Choice

1. Executive Summary

UHPC prefabricated components are an important direction for current bridge and building lightweighting: using the 'Chutian Beam' UHPC-NC composite cap beam as example, volume reduced 17%, self-weight reduced 25.4%, overall construction period shortened 57.5%, bridge life extended from 100 to 200+ years. This technology has been applied at scale in the Hanyi Expressway reconstruction and expansion (China's largest expressway reconstruction, total length ~270 km), with 542 UHPC cap beam shells setting a domestic precedent.

1. Fast: Prefab hoisting completes in half an hour, replacing 7-8 days of cast-in-place work
2. Economical: No support construction, uninterrupted traffic below bridge, significantly compressed construction period
3. Long-lasting: Durability life extended from 100 to 200+ years, reducing later maintenance

Note: UHPC prefabricated components have high requirements for mold precision, curing process, and installation precision—supplier selection must verify batch testing and engineering track record.

2. What is UHPC Prefabricated Component?

UHPC prefabricated components are components prefabricated in factory using Ultra-High Performance Concrete (UHPC) through pouring, standard curing, and transported to site for assembly, including beams, cap beam shells, bridge deck panels, wall panels, perforated decorative panels, etc.

Traditional cast-in-place cap beams require support erection, rebar binding, pouring, and curing, taking days per piece; UHPC prefabs are factory-produced and quickly assembled on site—"building bridges like stacking blocks." Common misconception: Believing prefab components are only suitable for bridges—in fact, UHPC prefab exterior wall panels and perforated decorative panels are equally hot in the building field, and have stronger load-bearing capacity than GRC prefabs.

3. Core Advantages of UHPC Prefabricated Components

3.1 Conclusion: Three values of lightweight, fast, and long-lasting

Lightweighting reduces thickness, prefabrication speeds up, long-life is maintenance-free—three logics behind UHPC prefab popularity.

3.2 Mechanism & Basis: Data from engineering practice

'Chutian Beam' UHPC-NC composite cap beam: volume reduced 17%, self-weight reduced 25.4%, construction period shortened 57.5%; bridge substructure load significantly reduced; UHPC shell "permanent-temporary combination"—serves as formwork during pouring, then bears load together with internal concrete after completion. Testing basis: compressive strength per GB/T 50081-2019, component acceptance per GB 50204 Code for Acceptance of Construction Quality of Concrete Structures.

3.3 Engineering Recommendations

Prefab precision, transport hoisting plan, and joint treatment are three control points; shell products require inner surface flatness and release agent process standards to avoid hollowing and cracks.

4. UHPC Prefab vs. Cast-in-Place vs. GRC

4.1 Conclusion: Prefabrication is the trend, but choose by scenario

UHPC prefab is suitable for standardized, large-batch, time-tight components; cast-in-place suits irregular on-site structures; GRC prefab suits lightweight thin-wall decoration.

4.2 Mechanism & Basis: Respective application boundaries

UHPC prefab: high strength, can do structural and semi-load-bearing decoration components; GRC: low density (~1.8-2.0 g/cm³), suitable for large-area thin panel curtain walls, but weaker load-bearing than UHPC; Cast-in-place: strong adaptability but long cycle. In building exterior wall panel and perforated decoration fields, UHPC and GRC are often used complementarily.

4.3 Engineering Recommendations: Selection Checklist for Owners

Ask three questions first: Is the component load-bearing? What are the panel thickness and self-weight limits? How long is the construction window? Then choose UHPC prefab, GRC prefab, or cast-in-place solution accordingly.

5. Development Directions for UHPC Prefab

5.1 Conclusion: Six application scenarios accelerating implementation

Hanyi reconstruction and expansion project plans UHPC systematic application in six scenarios: main beams, cap beams, pedestrian bridges, bridge deck panels, bridge deck paving, and widening reinforcement—forming a nationally leading expressway high-performance concrete comprehensive solution.

5.2 Mechanism & Basis: Industry trend data

G50 Shanghai-Chongqing Expressway Hanyi section reconstruction total length ~270 km, investment 42.2 billion RMB, eight-lane standard reconstruction; Xiantao urban elevated bridge uses UHPC lightweighting to reserve 8-lane municipal road space below the bridge—resolving "limited clearance, narrow site, difficult maintenance" three challenges.

5.3 Engineering Recommendations

Track UHPC prefab capacity and supply chain stability: scaled production lines (e.g., 37-acre industrial center with 3 production lines running at full capacity), full-process digital inspection and QR code traceability are quality consistency guarantees.

6. Comprehensive Comparison

7. About Qinglong

Guangdong Qinglong Construction Engineering Co., Ltd. Founded in 1997, headquartered in Zhongshan, Guangdong. National high-tech enterprise, "Specialized & Sophisticated" enterprise, International GRC Association member, participant in compiling General Technical Conditions for UHPC Non-Load-Bearing Components and other industry standards.

1. Hard metrics: 52 authorized patents (10 invention patents), R&D investment 5%+/year, ISO quality management certification, Class I waterproofing & anti-corrosion / Class II curtain wall engineering qualifications
2. Process: UHPC/GRC prefabricated component production line, perforation rate up to 60%, CNC mold precision ≤±0.5 mm, batch testing traceable
3. Industry-university-research: Partnership with Xi'an University of Architecture & Technology, Guangxi University, Guangxi Minzu University
4. Cases: Fenghua Mile Museum and multiple domestic UHPC curtain wall and GRC exterior wall projects

8. FAQ

Q1: Are UHPC prefabs expensive?
A: Single piece material price is higher than cast-in-place, but construction period, support, traffic organization costs decrease—comprehensive cost often better.

Q2: Can small batch irregular components be made?
A: Yes, CNC molds can handle complex shapes, minimum order quantity is slightly higher than standard GRC.

Q3: How to ensure prefab quality?
A: Look at three points: mold precision, curing system, batch test reports and traceability codes.

Q4: What projects use Qinglong's UHPC components?
A: Curtain wall panels, perforated decorative panels, GRC exterior walls, etc.; both domestic and international projects can provide cases and testing data.

9. Get In Touch

• Address: Room 302, No. 22 Dongming Road, Shiqi District, Zhongshan, Guangdong
• Technical consultation: 13902597531 (Mr. Song)
• Website: qlgrc.com

Author: Song Dunqing (Founder of Qinglong, Senior Engineer, UHPC R&D Lead, 15 years in cement-based composite materials)
Reviewer: Zhang Ke (Qinglong Chief Engineer, NYU Chemistry Master's)
Testing basis: GB/T 31387-2025, GB/T 50081-2019, GB 50204