Write a short note on subgrade preparation

Question

Asked: June 21, 20222022-06-21T23:16:42+05:30 2022-06-21T23:16:42+05:30In: Highway Engineering

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Vipin Chauhan · Accepted Answer · 2022-06-22T00:28:50+05:30

The selected soil in the loose condition is spread to uniform thickness using appropriate equipment over the prepared ground; the thickness of the loose soul is decided so as to obtain the specified compacted thickness of the layer, determined during proof rolling.
Additional water is required so as to obtain the OMC of the soil determined from the laboratory compaction test. However, in rare situations, if the field moisture content of the soil happens to be higher than the OMC, it may be necessary to delay the construction until the soil dries to the level of OMC before further compaction.
The soil with added water is mixed thoroughly using appropriate equipment so that the water gets distributed in the soil layer uniformly; the mixed soil is spread again to uniform layer thickness.
The soil layer is compacted by rolling using the selected equipment so as to obtain the specified density.
After ensuring that the layer has been compacted to the desired density, the next later of soil is spread over the already compacted layer, `water added, mixed, and compacted as mentioned in steps (1) to (4) above. The process is repeated until the desired height of the subgrade is achieved.