Title: High-Strength Concrete in Seattle
Author(s): Kingsley D. Drake
Publication: Symposium Paper
Appears on pages(s): 21-34
Keywords: columns (supports); compressive strength; high-rise
buildings; high-strength concretes; mass concrete; mix propor-tioning;
modulus of elasticity; quality control; temperature rise
During the past 5 years, the utilization of high-strength concrete in Seattle has come a long way. This paper summarizes high-strength concrete use on 7 projects in the Seattle area, with particular emphasis on 9500 psi (670 kg/sq.cm) concrete at the Columbia Center project. Columbia Center is used as an example of the cooperation and quality control required of the Structural Engineer, Contractor, Concrete Supplier and Testing Laboratory for high-strength concrete. Columbia Center was the first major project to use a high cement content mix in mass (1200 yd3 - approx. 918 m3) placements. Strength gain, modulus of elasticity and temperature rise charac-teristics are presented.