For a four layer flexible pavement, there is a surface course, base course, and ______________ constructed over a compacted, natural soil subgrade.

For a four layer flexible pavement, there is a surface course, base course, and ______________ constructed over a compacted, natural soil subgrade. Correct Answer sub-base course

When building a three layer flexible pavement, the subbase layer is not used and the base course is placed directly on the natural subgrade. A flexible pavement’s surface layer is constructed of hot-mix asphalt (HMA).Un stabilized aggregates are typically used for the base course; however, the base course could also be stabilized with asphalt, Foamed Bitumen, Portland cement, or another stabilizing agent. The sub base is generally constructed from local aggregate material, while the top of the subgrade is often stabilized with cement or lime.
Bissoy MCQ

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Flexible pavement consists of ______ course after subgrade course.
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The Alaskan pipeline ends