Applications

Concrete

High Performance Concrete (HPC) containing silica fume – has been identified as one of the more important advanced materials necessary in the effort to rebuild the nations infrastructure.  In addition to increased strength and enhanced durability, HPC produced with silica fume delivers increased toughness; increased resistance to abrasion, corrosion and chemicals; and placement and life-cycle cost efficiencies.

Highway bridges, parking decks, marine structures and bridge deck overlays are subject to constant deterioration caused by rebar corrosion current, abrasion and chemical attack.  Silica fume will protect concrete against deicing salts, seawater, road traffic and freeze/thaw cycles.  Rebar corrosion activity and concrete deterioration are virtually eliminated, which minimizes maintenance expense.  Key benefits include:

• Very low permeability to chloride and water intrusion.
• Extremely high electrical resistivity (20 to 100 times greater than ordinary concrete).
• Increased abrasion resistance on decks, floors, overlays and marine structures.
• Superior resistance to chemical attack from chlorides, acids, nitrates and sulfates.

Kansas City International Airport
650,000 square foot parking garage placed with silica-fume concrete. Average compressive strength was 3,965 psi at 2 days for post tensioning. Rapid chloride permeability (RCP) value of 250 coulombs was achieved with the addition of 10% of silica fume.

High-strength concrete enhanced with silica fume – provides architects and engineers with greater design flexibility.  Traditionally used in high-rise buildings for the benefit of smaller columns (increasing the usable space) high-strength concrete containing silica fume is often used in precast and prestressed girders allowing longer spans in structural bridge designs.  Key advantages include:

• Compressive strengths up to 20,000 psi (140 Mpa)
• High modulus of elasticity exceeding 6 million psi (40,000 Mpa)
• High flexural strengths (2,000 psi @ 28 days) for airport pavements
• High early strengths for fast-track construction projects and precast applications

Trump Palace, NY
A 56-story luxury residential high-rise tower utilized 1,200 cubic yards silica-fume concrete in the structural columns.  Specified compressive strength 12,500 at 28 days was achieved with the addition of 11% of silica fume.

Silica-fume concrete overlay as per NYSDOT specifications on a bridge deck in Manorville, NY