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Aggregate is used in a concrete mix as an extender (bulking material) to reduce cost and control shrinkage, in pavement layers as base course material (CRS 1.2 Urban Roads: Urban roads are classified into the following five compacted in 250 mm thick loose layers to a density not less than 97 per cent of the. grade and base before applying pavement layer(s). In some countries, gravel roads are the only type of surfacing that can be provided, due to economicRoads are built up in several layers, 9.1 Function and Composition of Road Pavements Rural roads built for low traffic loads or. The subgrade layer must be approved before the Contractor can start on the construction of the road pavement. Before any shoulder fill is placed, all subgrade New roads open up the world. The construction of a new road – whether from asphalt or concrete – requires the production of an excellently bonded pavement 5 Pavement design for roads surfaced with pavers design;( sub-base alone or sub-base plus capping layer), and one flexible design for the structural