Question
Download Solution PDFStudy the given statements P and Q, based on the plasticity index of soils and select the most appropriate option with respect to the correctness of the statements.
P. The plasticity index of a soil is a measure of the amount of clay in the soil.
Q. When silt is added to clay, the plasticity index of the resulting soil increases.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFPlasticity:
- The range of water content over which soils remains in a plastic state is known as the “Plasticity” of the soil.
- Clayey soils exhibit this plasticity property due to the presence of clay minerals.
Plasticity Index:
- It is a measure of the plasticity of the soil and is calculated as the difference between the liquid limit and the plastic limit.
- Plasticity index order: clay> silt> sand > gravel
- Adding silt to the clay reduces the plasticity or plasticity index of soil.
Additional Information
| Plasticity Index | Plasticity | Type of soil |
| 0 | Non-Plastic | Sand |
| <7 | Low Plastic | Silt |
| 7-17 | Medium Plastic | Silt-clay |
| >17 | High Plastic | Clay |
Last updated on May 28, 2025
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