Question

The ______________ is the region of the pavement section that is located directly under the surface course.

(a) sub-base course

(b) grit

(c) base course

(d) ballast

I had been asked this question by my school teacher while I was bunking the class.

My question comes from Analysis of Rate of Road Work in chapter Analysis of Rates of Civil Engineering Drawing

Answer 1

Correct option is (c) base course

Best explanation: If there is a sub-base course, the base course is constructed directly about this layer. Otherwise, it is built directly on top of the subgrade. Typical base course thickness ranges from 4 to 6 inches and is governed by underlying layer properties.

Heavy loads are continuously applied to pavement surfaces, and the base layer absorbs the majority of these stresses. Generally, the base course is constructed with an untreated crushed aggregate such as crushed stone, slag, or gravel. The base course material will have stability under the construction traffic and good drainage characteristics.