Research Article
Utilization of Coffee Husk Ash on the Geotechnical Properties of Gypsum-Stabilized Expansive Clayey Soil
Table 4
Summary of geotechnical properties of untreated expansive clayey soil.
| | Tests parameters | Properties | Test results | Test methods |
| | Grain size analysis | Gravel (%) | 0.00 | AASTO T-87 and T-88 | | Sand (%) | 7.26 | | Silt (%) | 37.41 | | Clay (%) | 55.33 |
| | Percentage of passing no. 200, (%) | 92.74 | |
| | Atterberg limits | Liquid limit (%) | 94 | AASTO T-89 | | Plastic limit (%) | 40 | AASTO T-90 | | Plasticity index (%) | 54 | | | Linear shrinkage (%) | 26.26 | AASHTO T-92 |
| | Soil classification | AASHTO | A-7-5 | AASHTO M145 | | USCS | CH | ASTM D2487 | | Color | Black | |
| | Specific gravity | — | 2.68 | ASTM D854 |
| | Compaction | OMC (%) | 37.20 | BS 1377 | | MDD (g/cm3) | 1.24 | BS 1377 |
| | UCS | UCS (kPa) | 89.31 | ASTM D2166 |
| | CBR | CBR unsoaked (%) | 12.53 | AASHTO T193 | | CBR soaked (%) | 1.53 | ASTM D1883 | | CBR swell (%) | 10.08 | |
| | Swell | Free swell index | 116 | IS: 2720 |
|
|
