A government-linked infrastructure contractor in Vietnam was constructing a 6.2 km elevated highway with multiple monolithic pier columns and segmental box girders. The project faced three critical challenges:
Extreme concrete pressure — traditional timber and aluminum formwork could not withstand the high hydrostatic pressure of large pier pours (up to 5m height per lift)
Low reuse rate — conventional formwork materials deformed or failed after 15–20 cycles, but the project required over 200 identical column pours
Dimensional precision — strict tolerances of ±2mm for segmental casting to ensure proper alignment of precast segments
Heavy vibration loads — external vibrators attached to formwork created high stress points
They needed a high-strength, dimensionally stable formwork system capable of delivering 200+ reuses without compromising concrete finish quality.
We supplied a custom-engineered modular steel formwork system with the following specifications:
| Specification | Detail |
| Material | Q235 / Q355 steel plates (4–6mm thickness) |
| Frame | Heavy-duty steel channel / rectangular tube ribs |
| Panel size | Modular (600×1500mm, 900×1500mm, 1200×1500mm) |
| Max concrete pressure resistance | 80–100 kN/m² |
| Connection system | High-strength taper tie rods + wedge bolts |
| Surface treatment | Powder coating or anti-rust paint |
Key technical features implemented:
Full-welded panel construction — no loose parts, maximum rigidity under vibration
Taper tie rod system — reusable cone-shaped ties that create consistent wall thickness without penetrating the formwork face
Modular panel design — interchangeable components allow multiple column sizes from same panel inventory
Reinforced corner units — 45° or 90° corner sections with additional ribbing to prevent deformation
On-site deployment:
2,500 m² of steel formwork panels delivered for pier column and segmental box girder casting
Systematic labeling of panels (Column A vs. Column B) for rapid reassembly
3 complete sets rotating across 8 casting yards
| Metric | Standard Aluminum Formwork | Steel Formwork System | Improvement |
| Maximum reuse cycles | 80–120 times | 200+ times (still in use) | 2x longer lifespan |
| Concrete pressure resistance | 60 kN/m² | 80–100 kN/m² | Suitable for massive pours |
| Dimensional tolerance after 100 uses | ±4–5mm | ±2mm | Higher precision |
| Repair frequency | Every 30–40 uses | Every 80–100 uses | Lower maintenance cost |
| Scrap value at end-of-life | Low (aluminum recycling) | High (steel scrap) | Better ROI recovery |
Financial impact:
Total formwork cost per cubic meter of concrete: reduced by 45% compared to aluminum alternative over 200 cycles
Zero unplanned downtime due to formwork failure
Acceptance rate for segment alignment: 98.5% (no rework required)
For infrastructure and high-repetition projects, steel formwork remains the industry standard:
Extreme durability
Withstands 200+ pours without significant deformation
Resists damage from external vibrators and heavy cleaning methods
High pressure tolerance
Suitable for tall columns (5m+ per lift) and tunnel lining
Eliminates risk of blowouts or bulging
Precision over time
Welded construction maintains dimensional stability
Consistent concrete finish across thousands of identical units
Lifecycle cost advantage
Higher upfront cost, but lowest cost-per-use over 200+ cycles
High scrap value at end of life (steel recycling)
Weather resistance
Performs reliably in extreme temperatures and humidity
Powder coating prevents rust in tropical environments
| Factor | Timber Plywood | Aluminum | Steel |
| Reuse cycles | 5–10 | 80–120 | 200+ |
| Max concrete pressure | 30–40 kN/m² | 60 kN/m² | 80–100 kN/m² |
| Weight per m² | Light (~25 kg) | Light (~28 kg) | Heavy (~55–65 kg) |
| Crane required? | No | No | Yes |
| Best application | Low-rise, custom shapes | High-rise repetitive slabs | Infrastructure, heavy columns, tunnels |
| Surface finish | Good (mirror with film face) | Excellent | Very Good (requires careful cleaning) |
The Steel Formwork System enabled this Vietnamese infrastructure contractor to complete over 200 identical column pours with consistent quality, zero formwork-related downtime, and a 45% reduction in cost per cubic meter compared to aluminum alternatives. For large-scale, high-repetition concrete projects, steel remains the most durable and cost-effective solution.
Looking for a durable steel formwork solution for your next infrastructure project?
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