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 6 m, 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. Determine the AASHTO soil classification and the group index (GI) for each layer.
2. Determine the "most probable" group symbols and group names for the various layers according to the Unified soil classification system. Use Table 5.4 and the soil characteristics given in the boring log.
Figure 5.33
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MATERIAL DESCRIPTION REMARKS 0 to 0.3 m Asphalt Pavement 0.3 S-1 0.6 0.9 S-2 38 18% minus No. 200 03 m to 06 m Fine Sand with Limerok FragmentsGC09. PI-5 28 48 20 0.6 m to L8 m Brown Fine Sand 8% minus No. 200: Np 19 15 S-3 2.11 S-4 1.8 m to 4.95Dark Brown Organic Sandy Silt 2.7 S-5 67% minus No. 200: 11. 52; PI 10 3.3 S-6 3.6 3.9 S-7 4.2 4.5 S-H 4.8 5.1 S-9 52% minus No. 200. IL: 36, PI = 9 26 4.95 m to 6 m: Sandy Silt 5.7 S-10 BORING TERMINATEDAT DETH OF 6m BOREHOLE GROUTED 36 6.0 BLOWS3DENSITY BLOWS/0.3m | CONSISTENCY İSAMILE SYMBOL Very Louse 0-2 Very Soft H- Hand sand S -Split Spoon T-Thin Wall Tube U-Undistrubted C Diamond Core W- Wasth Sample SAND ORGANIC SOILSIMUCK Medium still Still Very Still II-30 Medium Dense 31-50 CLAY 16-30 Very Dense LIMESTONE SANDTONE