What are the differences in function between roadbase and basecourse in flexible carriageway?

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Roadbase is the most important structural layer in bituminous pavement. It is designed to take up the function of distributing the traffic loads so as not to exceed the bearing capacity of subgrade. In addition, it helps to provide sufficient resistance to fatigue under cyclic loads and to offer a higher stiffness for the pavement structure.

However, the basecourse is normally provided to give a well-prepared and even surface for the laying on wearing course. Regarding the load distribution function, it also helps to spread traffic loads to roadbase but this is not the major function of basecourse.


This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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  • PAUL February 18, 2011 at 6:25 am

    so do you mean to say that the road base can be also the base course on which the wearing course can be laid?

    • Vincent T. H. CHU August 16, 2011 at 5:47 am

      No. The prinicpal function of roadbase is to spread loading, which is not the main purpose of base course.

  • Alpha jacob June 29, 2016 at 4:02 pm

    I want to read your text book on concrete technology.

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