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Why black soils are treated with cement or hydrated lime during Roadways and railways construction? Consider the reasons
1. To overcome problems of volume changes due to alternate expansion and shrinkage of soils.
2. To prevent soil erosion during wet season.
3. To improve bearing capacity of the soil.
Choose the correct reason from the codes below.

1, 2 only.
2, 3 only.
1, 3 only.
All the above.
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