Chapter 5, Problem 5.1CTP

The subsurface characteristics for a highway pavement rehabilitation project in the southeastern United States are shown in a “boring log” in Figure 5.13. The highway structure consists of the asphalt pavement underlain by four different soil strata up to a depth of 20 ft, after which the boring was terminated. Some data on the grain size and plasticity characteristics are also provided for each stratum. Perform the following tasks:

1. 1. Determine the AASHTO soil classification and the group index (GI) for each layer.
2. 2. Determine the “most probable” group symbols and group names for the various layers according to the Unified soil classification system. Use Table 5.3 and the soil characteristics given in the boring log.