One Tampa City Center

Langan provided geotechnical services for the 40-story office tower, including subsurface investigation, mat foundation analysis, and inspection of the 30-foot-deep excavation and backfill. During the site preparation work, the overburdening fine sand and the underlying plastic clay were excavated.  The fine sand was used as backfill after mixing it with portland cement in order to increase its compressive strength, as well as to facilitate compaction. The 40-story tower is supported on an 8-foot thick mat bearing on the cement-modified soil backfill.  Uniform settlements of less than a 1/2 inch were measured after construction.
Engineering News Record, "A Significant Achievement" Award
American Council of Engineering Companies, Engineering Excellence Award