Adaptation to the Design of Airfield Pavements

In the development of the design method based on the use of the CBR, test, the California Division of Highways tested adequate sections of flexible highway pavements and sections that failed and correlated the service behavior of the pavement with its bearing ratio. These data were consolidated into a design chart as explained in paper No. 2. This design chart shows the total thickness of base and surfacing required for a flexible highway pavement on a subgrade with a given CBR value. On this chart (see Fig. 5), as stated by Mr. Porter, curve A represents a total thickness of pavement and base course above the subgrade adequate for average highway traffic conditions, and curve B indicates the total thickness considered to be the minimum requirement for light highway traffic.