Ultra-high-performance concrete (UHPC) redefines what concrete can do: tensile strengths beyond 20 MPa, exceptional durability, and a sleek, self-consolidating finish. The secret? High-dose silica fume from Tech Silica.
What Is UHPC?
- Compressive strength ≥ 150 MPa
- Fiber reinforcement for toughness
- Low water-to-cementitious ratio (≤ 0.2)
- Highly refined particle packing
UHPC’s “superpowers” come from microstructure densification that ordinary mixes can’t match.
Role of Silica Fume in UHPC
- Micro-Filler Effect: Ultrafine particles fill voids between cement grains, boosting packing density.
- Pozzolanic Reaction: Silica fume reacts with Ca(OH)₂ to form additional C-S-H, increasing strength.
- Reduced Permeability: Creates a tighter matrix that blocks water, chlorides and gases.
Case Studies
- Bridge Deck Rehabilitation, Germany: 180 MPa slab with 12 % silica fume for extreme de-icing salt exposure.
- High-Rise Facade Panels, USA: 200 mm-thick UHPC panels reduced weight by 30 %, cut erection time by 20 %.
- Marine Piling, Japan: UHPC collars with silica fume extended service life to 100+ years in tidal zones.
UHPC Mix Tips Using Tech Silica Products
- Silica Fume Dosage: 10–25 % by cementitious mass
- Superplasticizer: High-range for low slump flow (650–800 mm)
- Fiber Content: 1.5–2.5 % steel or synthetic
- Curing: 24 hours steam or 7 days moist cure
Partner with Tech Silica
Our silica fume is micron-sized and engineered for UHPC’s exacting standards. Contact our technical team at technicalco.com/contact to optimize your next high-performance project.