The soil over which the roads structure rests in the foundation soil is known as option A formation level option B sub grade option C sub base option D base
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Answer:
The overall strength and performance of a pavement is dependent not only upon its design (including both mix design and structural design) but also on the load-bearing capacity of the subgrade soil. Thus, anything that can be done to increase the load-bearing capacity (or structural support) of the subgrade soil will most likely improve the pavement load-bearing capacity and thus, pavement strength and performance. Additionally, greater subgrade structural capacity can result in thinner (but not excessively thin) and more economical pavement structures. Finally, the finished subgrade should meet elevations, grades and slopes specified in the contract plans. This subsection covers:
Increasing subgrade support by compaction
Increasing subgrade support by alternative means
Subgrade elevation
Primecoats for HMA pavements
Other subgrade preparation practices
Explanation: