Why should a uniform and regular sub-base surface be provided in concrete pavement?

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The surfaces of sub-base material for concrete carriageway should be constructed in a regular manner because of the following reasons:

(i) One of the main functions of sub-base in concrete pavement is to provide a smooth and even interface between concrete slab and subgrade so that a uniform support is established. A regular surface of
sub-base assists in reducing the frictional and interlocking forces between concrete slab and sub-base and allowing easier temperature and shrinkage movement.

(ii) A uniform sub-base surface is essential in the construction of concrete slab of uniform thickness adopted in design. It saves the higher cost of concrete to make up the required level.


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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