Review of Soil Classification Systems Applicable to Airport Pavement Design.
Final rept. May 73-May 74,
FEDERAL AVIATION ADMINISTRATION WASHINGTON D C SYSTEMS RESEARCH AND DEVELOPMENT SERVICE
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Three soil classification systems used in the paving profession were evaluated to determine the applicability of each for airport pavement design. The three methods studied were the AASHO, FAA and Unified systems. It is shown that the FAA system for fine grained soils is largely dependent upon the liquid limit, whereas the classification by the other methods depends upon both the liquid limit and the plasticity index. It is demonstrated that the plasticity index is a good predictor of several properties and, hence, the FAA system is somewhat limited in that regard. A sensitivity analysis was made on the ability of each of the systems to predict various soil properties. The FAA system was found to be relatively more insensitive than the other systems. A statistical analysis was made of several soil areas. It is demonstrated that the Unified system is relatively more sensitive in predicting soil behavior than the AASHO and FAA systems. Modified author abstract
- Terminal Flight Facilities
- Soil Mechanics
- Civil Engineering