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Q: Which of the following statements is/are true regarding the soil required for subgrade in road construction? i. It must have good permeability or drainage characteristics. ii. It must undergo high volume changes. iii. It must have high bending strength. iv. It must be uniformly graded.
  • A. Only i
  • B. Both iii and iv
  • C. Both i and iv
  • D. Both ii and iii
Correct Answer: Option A - The soil required for sub grade in road construction it must have good permeability or drainage characteristics. Sub-grades:– The sub-grade layer of a pavement is essentially, the underlying ground. It is also known as the "Formation level", which can be defined as the level at which excavation ceases and construction starts.
A. The soil required for sub grade in road construction it must have good permeability or drainage characteristics. Sub-grades:– The sub-grade layer of a pavement is essentially, the underlying ground. It is also known as the "Formation level", which can be defined as the level at which excavation ceases and construction starts.

Explanations:

The soil required for sub grade in road construction it must have good permeability or drainage characteristics. Sub-grades:– The sub-grade layer of a pavement is essentially, the underlying ground. It is also known as the "Formation level", which can be defined as the level at which excavation ceases and construction starts.