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In contrast to the APSDS design the LEDFAA calculations report that the subgrade CDFseems to be the design criterion most of the times. Based on the load spreading capabilities of thebound subbase layer of the alternative structure this does not seem to be realistic. In principle it isundesirable to have the subgrade determining the design as this can result in secondarydeformation in case of overloading at a location difficult to get under control once it occurs. Forthe same reason thick unbound aggregate layers are not recommended as measure for increasingthe structural strength of pavements to be built for the new generation heavy aircraft
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