For this 57-story high-rise structure in downtown Cleveland, the engineer
specified a concrete with a compressive strength of 12,000 psi and a modulus
of elasticity of 6,800,000 psi. This very high modulus was necessary to
stiffen the structure against sway caused by wind from nearby Lake Erie.
The high modulus was achieved using local aggregates in a concrete with an
average compressive strength at 56 days over 15,000 psi.
The concrete for this structure contained a combination of portland cement,
blast furnace slag, and silica fume. The water-cementitious materials ratio
was 0.24. A combination of chemical admixtures was used to produce a
minimum slump of 10 in.
The Silica Fume Association
38860 Sierra Lane, Lovettsville, VA 20180
Tel: 540.257.4224 Fax: 540.822.9456
