• THAT’S A FACT
    If America’s 47,744 miles of interstate highways were paved with concrete, 10,989,557 gallons of fuel would be saved each day.
  • EAR TO THE GROUND
    Service Life Engineering has become its own powerful field of study with immense impact on the future.
  • THAT’S A FACT
    Concrete is a light color, which reflects from 33 to 50 per cent more light than asphalt, and can even lower the average town temperature by six degrees.
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Durability Assessment Report: Proposed United Stated Consulate, Dakar Senegal

The design-build team had to provide a comprehensive durability analysis for the proposed consulate building in Dakar, Senegal. The environment included both corrosive soils as a marine coastal exposure at elevated temperatures and the desired life needed to be 100 years using ordinary Portland cement concretes, since fly ash, ground granulated blast furnace slag, silica fume and other pozzolans were not available. Furthermore, only black steel reinforcing bars were available.

TCG determined the exposure parameters for the elements in the ground water, in soil above the ground water and for the airborne coastal exposures. To perform the service-life analysis, the Stadium® software from SIMCO Technologies, Inc. was employed. This enabled modeling the elemental shapes and environment exposures for chloride ingress and the formation of other potential failure mechanisms such as sulfate attack. Then for maximum practical concrete cover over the reinforcing bars the estimated life before corrosion initiation and damage due to propagation of corrosion was determined. Supplemental protection systems including membranes, surface treatments and corrosion inhibitors were then recommended to meet the 100-year design life.

In addition to the life cycle analysis, TCG provided guidelines to minimize cracking due to thermal and drying shrinkage, which could compromise the predicted performances. Curing recommendations were presented to further insure that the concrete properties were not compromised.